From: Ben Pfaff Date: Fri, 24 Oct 2008 16:43:44 +0000 (-0700) Subject: Break secchan into multiple files, to make it more maintainable. X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=18d534b64e5342945443aacc30cb287c1445206b;p=openvswitch Break secchan into multiple files, to make it more maintainable. --- diff --git a/include/vlog-modules.def b/include/vlog-modules.def index 3b805c7d..9df65e11 100644 --- a/include/vlog-modules.def +++ b/include/vlog-modules.def @@ -6,19 +6,26 @@ VLOG_MODULE(daemon) VLOG_MODULE(datapath) VLOG_MODULE(dhcp) VLOG_MODULE(dhcp_client) +VLOG_MODULE(discovery) VLOG_MODULE(dpif) VLOG_MODULE(dpctl) +VLOG_MODULE(fail_open) VLOG_MODULE(fault) VLOG_MODULE(flow) +VLOG_MODULE(in_band) VLOG_MODULE(learning_switch) VLOG_MODULE(mac_learning) VLOG_MODULE(netdev) VLOG_MODULE(netlink) VLOG_MODULE(ofp_discover) VLOG_MODULE(poll_loop) +VLOG_MODULE(port_watcher) VLOG_MODULE(secchan) VLOG_MODULE(rconn) +VLOG_MODULE(snat) VLOG_MODULE(stp) +VLOG_MODULE(stp_secchan) +VLOG_MODULE(status) VLOG_MODULE(switch) VLOG_MODULE(terminal) VLOG_MODULE(socket_util) diff --git a/secchan/automake.mk b/secchan/automake.mk index fb4662d0..4572e8a4 100644 --- a/secchan/automake.mk +++ b/secchan/automake.mk @@ -1,7 +1,27 @@ bin_PROGRAMS += secchan/secchan man_MANS += secchan/secchan.8 -secchan_secchan_SOURCES = secchan/secchan.c +secchan_secchan_SOURCES = \ + secchan/discovery.c \ + secchan/discovery.h \ + secchan/fail-open.c \ + secchan/fail-open.h \ + secchan/in-band.c \ + secchan/in-band.h \ + secchan/port-watcher.c \ + secchan/port-watcher.h \ + secchan/ratelimit.c \ + secchan/ratelimit.h \ + secchan/secchan.c \ + secchan/status.c \ + secchan/status.h \ + secchan/stp-secchan.c \ + secchan/stp-secchan.h +if SUPPORT_SNAT +secchan_secchan_SOURCES += \ + secchan/snat.c \ + secchan/snat.h +endif secchan_secchan_LDADD = lib/libopenflow.a $(FAULT_LIBS) $(SSL_LIBS) EXTRA_DIST += secchan/secchan.8.in diff --git a/secchan/discovery.c b/secchan/discovery.c new file mode 100644 index 00000000..1ffaf647 --- /dev/null +++ b/secchan/discovery.c @@ -0,0 +1,251 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#include +#include "discovery.h" +#include +#include +#include +#include "dhcp-client.h" +#include "dhcp.h" +#include "netdev.h" +#include "openflow.h" +#include "packets.h" +#include "port-watcher.h" +#include "secchan.h" +#include "status.h" + +#define THIS_MODULE VLM_discovery +#include "vlog.h" + +struct discovery +{ + const struct settings *s; + struct dhclient *dhcp; + int n_changes; +}; + +static void modify_dhcp_request(struct dhcp_msg *, void *aux); +static bool validate_dhcp_offer(const struct dhcp_msg *, void *aux); + +static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(60, 60); + +static void +discovery_status_cb(struct status_reply *sr, void *d_) +{ + struct discovery *d = d_; + + status_reply_put(sr, "accept-remote=%s", d->s->accept_controller_re); + status_reply_put(sr, "n-changes=%d", d->n_changes); + if (d->dhcp) { + status_reply_put(sr, "state=%s", dhclient_get_state(d->dhcp)); + status_reply_put(sr, "state-elapsed=%u", + dhclient_get_state_elapsed(d->dhcp)); + if (dhclient_is_bound(d->dhcp)) { + uint32_t ip = dhclient_get_ip(d->dhcp); + uint32_t netmask = dhclient_get_netmask(d->dhcp); + uint32_t router = dhclient_get_router(d->dhcp); + + const struct dhcp_msg *cfg = dhclient_get_config(d->dhcp); + uint32_t dns_server; + char *domain_name; + int i; + + status_reply_put(sr, "ip="IP_FMT, IP_ARGS(&ip)); + status_reply_put(sr, "netmask="IP_FMT, IP_ARGS(&netmask)); + if (router) { + status_reply_put(sr, "router="IP_FMT, IP_ARGS(&router)); + } + + for (i = 0; dhcp_msg_get_ip(cfg, DHCP_CODE_DNS_SERVER, i, + &dns_server); + i++) { + status_reply_put(sr, "dns%d="IP_FMT, i, IP_ARGS(&dns_server)); + } + + domain_name = dhcp_msg_get_string(cfg, DHCP_CODE_DOMAIN_NAME); + if (domain_name) { + status_reply_put(sr, "domain=%s", domain_name); + free(domain_name); + } + + status_reply_put(sr, "lease-remaining=%u", + dhclient_get_lease_remaining(d->dhcp)); + } + } +} + +static void +discovery_local_port_cb(const struct ofp_phy_port *port, void *d_) +{ + struct discovery *d = d_; + if (port) { + char name[OFP_MAX_PORT_NAME_LEN + 1]; + struct netdev *netdev; + int retval; + + /* Check that this was really a change. */ + get_port_name(port, name, sizeof name); + if (d->dhcp && !strcmp(netdev_get_name(dhclient_get_netdev(d->dhcp)), + name)) { + return; + } + + /* Destroy current DHCP client. */ + dhclient_destroy(d->dhcp); + d->dhcp = NULL; + + /* Bring local network device up. */ + retval = netdev_open(name, NETDEV_ETH_TYPE_NONE, &netdev); + if (retval) { + VLOG_ERR("Could not open %s device, discovery disabled: %s", + name, strerror(retval)); + return; + } + retval = netdev_turn_flags_on(netdev, NETDEV_UP, true); + if (retval) { + VLOG_ERR("Could not bring %s device up, discovery disabled: %s", + name, strerror(retval)); + return; + } + netdev_close(netdev); + + /* Initialize DHCP client. */ + retval = dhclient_create(name, modify_dhcp_request, + validate_dhcp_offer, (void *) d->s, &d->dhcp); + if (retval) { + VLOG_ERR("Failed to initialize DHCP client, " + "discovery disabled: %s", strerror(retval)); + return; + } + dhclient_set_max_timeout(d->dhcp, 3); + dhclient_init(d->dhcp, 0); + } else { + dhclient_destroy(d->dhcp); + d->dhcp = NULL; + } +} + + +struct discovery * +discovery_init(const struct settings *s, struct port_watcher *pw, + struct switch_status *ss) +{ + struct discovery *d; + + d = xmalloc(sizeof *d); + d->s = s; + d->dhcp = NULL; + d->n_changes = 0; + + switch_status_register_category(ss, "discovery", discovery_status_cb, d); + port_watcher_register_local_port_callback(pw, discovery_local_port_cb, d); + + return d; +} + +void +discovery_question_connectivity(struct discovery *d) +{ + if (d->dhcp) { + dhclient_force_renew(d->dhcp, 15); + } +} + +bool +discovery_run(struct discovery *d, char **controller_name) +{ + if (!d->dhcp) { + *controller_name = NULL; + return true; + } + + dhclient_run(d->dhcp); + if (!dhclient_changed(d->dhcp)) { + return false; + } + + dhclient_configure_netdev(d->dhcp); + if (d->s->update_resolv_conf) { + dhclient_update_resolv_conf(d->dhcp); + } + + if (dhclient_is_bound(d->dhcp)) { + *controller_name = dhcp_msg_get_string(dhclient_get_config(d->dhcp), + DHCP_CODE_OFP_CONTROLLER_VCONN); + VLOG_WARN("%s: discovered controller", *controller_name); + d->n_changes++; + } else { + *controller_name = NULL; + if (d->n_changes) { + VLOG_WARN("discovered controller no longer available"); + d->n_changes++; + } + } + return true; +} + +void +discovery_wait(struct discovery *d) +{ + if (d->dhcp) { + dhclient_wait(d->dhcp); + } +} + +static void +modify_dhcp_request(struct dhcp_msg *msg, void *aux) +{ + dhcp_msg_put_string(msg, DHCP_CODE_VENDOR_CLASS, "OpenFlow"); +} + +static bool +validate_dhcp_offer(const struct dhcp_msg *msg, void *s_) +{ + const struct settings *s = s_; + char *vconn_name; + bool accept; + + vconn_name = dhcp_msg_get_string(msg, DHCP_CODE_OFP_CONTROLLER_VCONN); + if (!vconn_name) { + VLOG_WARN_RL(&rl, "rejecting DHCP offer missing controller vconn"); + return false; + } + accept = !regexec(&s->accept_controller_regex, vconn_name, 0, NULL, 0); + if (!accept) { + VLOG_WARN_RL(&rl, "rejecting controller vconn that fails to match %s", + s->accept_controller_re); + } + free(vconn_name); + return accept; +} diff --git a/secchan/discovery.h b/secchan/discovery.h new file mode 100644 index 00000000..b2cb03c9 --- /dev/null +++ b/secchan/discovery.h @@ -0,0 +1,50 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#ifndef DISCOVERY_H +#define DISCOVERY_H 1 + +#include + +struct settings; +struct port_watcher; +struct switch_status; + +struct discovery *discovery_init(const struct settings *, + struct port_watcher *, + struct switch_status *); +void discovery_question_connectivity(struct discovery *); +bool discovery_run(struct discovery *, char **controller_name); +void discovery_wait(struct discovery *); + +#endif /* discovery.h */ diff --git a/secchan/fail-open.c b/secchan/fail-open.c new file mode 100644 index 00000000..8440efaa --- /dev/null +++ b/secchan/fail-open.c @@ -0,0 +1,151 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#include +#include "fail-open.h" +#include +#include +#include +#include "learning-switch.h" +#include "netdev.h" +#include "packets.h" +#include "port-watcher.h" +#include "rconn.h" +#include "secchan.h" +#include "status.h" +#include "stp-secchan.h" +#include "timeval.h" + +#define THIS_MODULE VLM_fail_open +#include "vlog.h" + +struct fail_open_data { + const struct settings *s; + struct rconn *local_rconn; + struct rconn *remote_rconn; + struct lswitch *lswitch; + int last_disconn_secs; + time_t boot_deadline; +}; + +/* Causes 'r' to enter or leave fail-open mode, if appropriate. */ +static void +fail_open_periodic_cb(void *fail_open_) +{ + struct fail_open_data *fail_open = fail_open_; + int disconn_secs; + bool open; + + if (time_now() < fail_open->boot_deadline) { + return; + } + disconn_secs = rconn_failure_duration(fail_open->remote_rconn); + open = disconn_secs >= fail_open->s->probe_interval * 3; + if (open != (fail_open->lswitch != NULL)) { + if (!open) { + VLOG_WARN("No longer in fail-open mode"); + lswitch_destroy(fail_open->lswitch); + fail_open->lswitch = NULL; + } else { + VLOG_WARN("Could not connect to controller for %d seconds, " + "failing open", disconn_secs); + fail_open->lswitch = lswitch_create(fail_open->local_rconn, true, + fail_open->s->max_idle); + fail_open->last_disconn_secs = disconn_secs; + } + } else if (open && disconn_secs > fail_open->last_disconn_secs + 60) { + VLOG_WARN("Still in fail-open mode after %d seconds disconnected " + "from controller", disconn_secs); + fail_open->last_disconn_secs = disconn_secs; + } + if (fail_open->lswitch) { + lswitch_run(fail_open->lswitch, fail_open->local_rconn); + } +} + +static void +fail_open_wait_cb(void *fail_open_) +{ + struct fail_open_data *fail_open = fail_open_; + if (fail_open->lswitch) { + lswitch_wait(fail_open->lswitch); + } +} + +static bool +fail_open_local_packet_cb(struct relay *r, void *fail_open_) +{ + struct fail_open_data *fail_open = fail_open_; + if (rconn_is_connected(fail_open->remote_rconn) || !fail_open->lswitch) { + return false; + } else { + lswitch_process_packet(fail_open->lswitch, fail_open->local_rconn, + r->halves[HALF_LOCAL].rxbuf); + rconn_run(fail_open->local_rconn); + return true; + } +} + +static void +fail_open_status_cb(struct status_reply *sr, void *fail_open_) +{ + struct fail_open_data *fail_open = fail_open_; + const struct settings *s = fail_open->s; + int trigger_duration = s->probe_interval * 3; + int cur_duration = rconn_failure_duration(fail_open->remote_rconn); + + status_reply_put(sr, "trigger-duration=%d", trigger_duration); + status_reply_put(sr, "current-duration=%d", cur_duration); + status_reply_put(sr, "triggered=%s", + cur_duration >= trigger_duration ? "true" : "false"); + status_reply_put(sr, "max-idle=%d", s->max_idle); +} + +struct hook +fail_open_hook_create(const struct settings *s, struct switch_status *ss, + struct rconn *local_rconn, struct rconn *remote_rconn) +{ + struct fail_open_data *fail_open = xmalloc(sizeof *fail_open); + fail_open->s = s; + fail_open->local_rconn = local_rconn; + fail_open->remote_rconn = remote_rconn; + fail_open->lswitch = NULL; + fail_open->boot_deadline = time_now() + s->probe_interval * 3; + if (s->enable_stp) { + fail_open->boot_deadline += STP_EXTRA_BOOT_TIME; + } + switch_status_register_category(ss, "fail-open", + fail_open_status_cb, fail_open); + return make_hook(fail_open_local_packet_cb, NULL, + fail_open_periodic_cb, fail_open_wait_cb, fail_open); +} diff --git a/secchan/fail-open.h b/secchan/fail-open.h new file mode 100644 index 00000000..ed69c885 --- /dev/null +++ b/secchan/fail-open.h @@ -0,0 +1,46 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#ifndef FAIL_OPEN_H +#define FAIL_OPEN_H 1 + +struct settings; +struct switch_status; +struct rconn; + +struct hook fail_open_hook_create(const struct settings *, + struct switch_status *, + struct rconn *local, + struct rconn *remote); + +#endif /* fail-open.h */ diff --git a/secchan/in-band.c b/secchan/in-band.c new file mode 100644 index 00000000..141f2351 --- /dev/null +++ b/secchan/in-band.c @@ -0,0 +1,302 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#include +#include "in-band.h" +#include +#include +#include +#include +#include "flow.h" +#include "mac-learning.h" +#include "netdev.h" +#include "ofpbuf.h" +#include "openflow.h" +#include "packets.h" +#include "port-watcher.h" +#include "rconn.h" +#include "secchan.h" +#include "status.h" +#include "timeval.h" +#include "vconn.h" + +#define THIS_MODULE VLM_in_band +#include "vlog.h" + +struct in_band_data { + const struct settings *s; + struct mac_learning *ml; + struct netdev *of_device; + struct rconn *controller; + int n_queued; +}; + +static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(60, 60); + +static void +queue_tx(struct rconn *rc, struct in_band_data *in_band, struct ofpbuf *b) +{ + rconn_send_with_limit(rc, b, &in_band->n_queued, 10); +} + +static const uint8_t * +get_controller_mac(struct in_band_data *in_band) +{ + static uint32_t ip, last_nonzero_ip; + static uint8_t mac[ETH_ADDR_LEN], last_nonzero_mac[ETH_ADDR_LEN]; + static time_t next_refresh = 0; + + uint32_t last_ip = ip; + + time_t now = time_now(); + + ip = rconn_get_ip(in_band->controller); + if (last_ip != ip || !next_refresh || now >= next_refresh) { + bool have_mac; + + /* Look up MAC address. */ + memset(mac, 0, sizeof mac); + if (ip && in_band->of_device) { + int retval = netdev_arp_lookup(in_band->of_device, ip, mac); + if (retval) { + VLOG_DBG_RL(&rl, "cannot look up controller hw address " + "("IP_FMT"): %s", IP_ARGS(&ip), strerror(retval)); + } + } + have_mac = !eth_addr_is_zero(mac); + + /* Log changes in IP, MAC addresses. */ + if (ip && ip != last_nonzero_ip) { + VLOG_DBG("controller IP address changed from "IP_FMT + " to "IP_FMT, IP_ARGS(&last_nonzero_ip), IP_ARGS(&ip)); + last_nonzero_ip = ip; + } + if (have_mac && memcmp(last_nonzero_mac, mac, ETH_ADDR_LEN)) { + VLOG_DBG("controller MAC address changed from "ETH_ADDR_FMT" to " + ETH_ADDR_FMT, + ETH_ADDR_ARGS(last_nonzero_mac), ETH_ADDR_ARGS(mac)); + memcpy(last_nonzero_mac, mac, ETH_ADDR_LEN); + } + + /* Schedule next refresh. + * + * If we have an IP address but not a MAC address, then refresh + * quickly, since we probably will get a MAC address soon (via ARP). + * Otherwise, we can afford to wait a little while. */ + next_refresh = now + (!ip || have_mac ? 10 : 1); + } + return !eth_addr_is_zero(mac) ? mac : NULL; +} + +static bool +is_controller_mac(const uint8_t dl_addr[ETH_ADDR_LEN], + struct in_band_data *in_band) +{ + const uint8_t *mac = get_controller_mac(in_band); + return mac && eth_addr_equals(mac, dl_addr); +} + +static void +in_band_learn_mac(struct in_band_data *in_band, + uint16_t in_port, const uint8_t src_mac[ETH_ADDR_LEN]) +{ + if (mac_learning_learn(in_band->ml, src_mac, in_port)) { + VLOG_DBG_RL(&rl, "learned that "ETH_ADDR_FMT" is on port %"PRIu16, + ETH_ADDR_ARGS(src_mac), in_port); + } +} + +static bool +in_band_local_packet_cb(struct relay *r, void *in_band_) +{ + struct in_band_data *in_band = in_band_; + struct rconn *rc = r->halves[HALF_LOCAL].rconn; + struct ofp_packet_in *opi; + struct eth_header *eth; + struct ofpbuf payload; + struct flow flow; + uint16_t in_port; + int out_port; + + if (!get_ofp_packet_eth_header(r, &opi, ð) || !in_band->of_device) { + return false; + } + in_port = ntohs(opi->in_port); + + /* Deal with local stuff. */ + if (in_port == OFPP_LOCAL) { + /* Sent by secure channel. */ + out_port = mac_learning_lookup(in_band->ml, eth->eth_dst); + } else if (eth_addr_equals(eth->eth_dst, + netdev_get_etheraddr(in_band->of_device))) { + /* Sent to secure channel. */ + out_port = OFPP_LOCAL; + in_band_learn_mac(in_band, in_port, eth->eth_src); + } else if (eth->eth_type == htons(ETH_TYPE_ARP) + && eth_addr_is_broadcast(eth->eth_dst) + && is_controller_mac(eth->eth_src, in_band)) { + /* ARP sent by controller. */ + out_port = OFPP_FLOOD; + } else if (is_controller_mac(eth->eth_dst, in_band) + || is_controller_mac(eth->eth_src, in_band)) { + /* Traffic to or from controller. Switch it by hand. */ + in_band_learn_mac(in_band, in_port, eth->eth_src); + out_port = mac_learning_lookup(in_band->ml, eth->eth_dst); + } else { + const uint8_t *controller_mac; + controller_mac = get_controller_mac(in_band); + if (eth->eth_type == htons(ETH_TYPE_ARP) + && eth_addr_is_broadcast(eth->eth_dst) + && is_controller_mac(eth->eth_src, in_band)) { + /* ARP sent by controller. */ + out_port = OFPP_FLOOD; + } else if (is_controller_mac(eth->eth_dst, in_band) + && in_port == mac_learning_lookup(in_band->ml, + controller_mac)) { + /* Drop controller traffic that arrives on the controller port. */ + out_port = -1; + } else { + return false; + } + } + + get_ofp_packet_payload(opi, &payload); + flow_extract(&payload, in_port, &flow); + if (in_port == out_port) { + /* The input and output port match. Set up a flow to drop packets. */ + queue_tx(rc, in_band, make_add_flow(&flow, ntohl(opi->buffer_id), + in_band->s->max_idle, 0)); + } else if (out_port != OFPP_FLOOD) { + /* The output port is known, so add a new flow. */ + queue_tx(rc, in_band, + make_add_simple_flow(&flow, ntohl(opi->buffer_id), + out_port, in_band->s->max_idle)); + + /* If the switch didn't buffer the packet, we need to send a copy. */ + if (ntohl(opi->buffer_id) == UINT32_MAX) { + queue_tx(rc, in_band, + make_unbuffered_packet_out(&payload, in_port, out_port)); + } + } else { + /* We don't know that MAC. Send along the packet without setting up a + * flow. */ + struct ofpbuf *b; + if (ntohl(opi->buffer_id) == UINT32_MAX) { + b = make_unbuffered_packet_out(&payload, in_port, out_port); + } else { + b = make_buffered_packet_out(ntohl(opi->buffer_id), + in_port, out_port); + } + queue_tx(rc, in_band, b); + } + return true; +} + +static void +in_band_status_cb(struct status_reply *sr, void *in_band_) +{ + struct in_band_data *in_band = in_band_; + struct in_addr local_ip; + uint32_t controller_ip; + const uint8_t *controller_mac; + + if (in_band->of_device) { + const uint8_t *mac = netdev_get_etheraddr(in_band->of_device); + if (netdev_get_in4(in_band->of_device, &local_ip)) { + status_reply_put(sr, "local-ip="IP_FMT, IP_ARGS(&local_ip.s_addr)); + } + status_reply_put(sr, "local-mac="ETH_ADDR_FMT, ETH_ADDR_ARGS(mac)); + + controller_ip = rconn_get_ip(in_band->controller); + if (controller_ip) { + status_reply_put(sr, "controller-ip="IP_FMT, + IP_ARGS(&controller_ip)); + } + controller_mac = get_controller_mac(in_band); + if (controller_mac) { + status_reply_put(sr, "controller-mac="ETH_ADDR_FMT, + ETH_ADDR_ARGS(controller_mac)); + } + } +} + +void +get_ofp_packet_payload(struct ofp_packet_in *opi, struct ofpbuf *payload) +{ + payload->data = opi->data; + payload->size = ntohs(opi->header.length) - offsetof(struct ofp_packet_in, + data); +} + +static void +in_band_local_port_cb(const struct ofp_phy_port *port, void *in_band_) +{ + struct in_band_data *in_band = in_band_; + if (port) { + char name[sizeof port->name + 1]; + get_port_name(port, name, sizeof name); + + if (!in_band->of_device + || strcmp(netdev_get_name(in_band->of_device), name)) + { + int error; + netdev_close(in_band->of_device); + error = netdev_open(name, NETDEV_ETH_TYPE_NONE, + &in_band->of_device); + if (error) { + VLOG_ERR("failed to open in-band control network device " + "\"%s\": %s", name, strerror(errno)); + } + } + } else { + netdev_close(in_band->of_device); + in_band->of_device = NULL; + } +} + +struct hook +in_band_hook_create(const struct settings *s, struct switch_status *ss, + struct port_watcher *pw, struct rconn *remote) +{ + struct in_band_data *in_band; + + in_band = xcalloc(1, sizeof *in_band); + in_band->s = s; + in_band->ml = mac_learning_create(); + in_band->of_device = NULL; + in_band->controller = remote; + switch_status_register_category(ss, "in-band", in_band_status_cb, in_band); + port_watcher_register_local_port_callback(pw, in_band_local_port_cb, + in_band); + return make_hook(in_band_local_packet_cb, NULL, NULL, NULL, in_band); +} diff --git a/secchan/in-band.h b/secchan/in-band.h new file mode 100644 index 00000000..573914e9 --- /dev/null +++ b/secchan/in-band.h @@ -0,0 +1,47 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#ifndef IN_BAND_H +#define IN_BAND_H 1 + +struct port_watcher; +struct rconn; +struct settings; +struct switch_status; + +struct hook in_band_hook_create(const struct settings *, + struct switch_status *, + struct port_watcher *, + struct rconn *remote); + +#endif /* in-band.h */ diff --git a/secchan/port-watcher.c b/secchan/port-watcher.c new file mode 100644 index 00000000..33f42055 --- /dev/null +++ b/secchan/port-watcher.c @@ -0,0 +1,495 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#include +#include "port-watcher.h" +#include +#include +#include +#include +#include "dynamic-string.h" +#include "ofpbuf.h" +#include "openflow.h" +#include "poll-loop.h" +#include "port-array.h" +#include "rconn.h" +#include "timeval.h" +#include "vconn.h" +#include "xtoxll.h" + +#define THIS_MODULE VLM_port_watcher +#include "vlog.h" + +struct port_watcher_cb { + port_changed_cb_func *port_changed; + void *aux; +}; + +struct port_watcher_local_cb { + local_port_changed_cb_func *local_port_changed; + void *aux; +}; + +struct port_watcher { + struct rconn *local_rconn; + struct rconn *remote_rconn; + struct port_array ports; + time_t last_feature_request; + bool got_feature_reply; + uint64_t datapath_id; + int n_txq; + struct port_watcher_cb cbs[2]; + int n_cbs; + struct port_watcher_local_cb local_cbs[4]; + int n_local_cbs; + char local_port_name[OFP_MAX_PORT_NAME_LEN + 1]; +}; + +/* Returns the number of fields that differ from 'a' to 'b'. */ +static int +opp_differs(const struct ofp_phy_port *a, const struct ofp_phy_port *b) +{ + BUILD_ASSERT_DECL(sizeof *a == 48); /* Trips when we add or remove fields. */ + return ((a->port_no != b->port_no) + + (memcmp(a->hw_addr, b->hw_addr, sizeof a->hw_addr) != 0) + + (memcmp(a->name, b->name, sizeof a->name) != 0) + + (a->config != b->config) + + (a->state != b->state) + + (a->curr != b->curr) + + (a->advertised != b->advertised) + + (a->supported != b->supported) + + (a->peer != b->peer)); +} + +static void +sanitize_opp(struct ofp_phy_port *opp) +{ + size_t i; + + for (i = 0; i < sizeof opp->name; i++) { + char c = opp->name[i]; + if (c && (c < 0x20 || c > 0x7e)) { + opp->name[i] = '.'; + } + } + opp->name[sizeof opp->name - 1] = '\0'; +} + +static void +call_port_changed_callbacks(struct port_watcher *pw, int port_no, + const struct ofp_phy_port *old, + const struct ofp_phy_port *new) +{ + int i; + for (i = 0; i < pw->n_cbs; i++) { + port_changed_cb_func *port_changed = pw->cbs[i].port_changed; + (port_changed)(port_no, old, new, pw->cbs[i].aux); + } +} + +void +get_port_name(const struct ofp_phy_port *port, char *name, size_t name_size) +{ + char *p; + + memcpy(name, port->name, MIN(name_size, sizeof port->name)); + name[name_size - 1] = '\0'; + for (p = name; *p != '\0'; p++) { + if (*p < 32 || *p > 126) { + *p = '.'; + } + } +} + +static struct ofp_phy_port * +lookup_port(const struct port_watcher *pw, uint16_t port_no) +{ + return port_array_get(&pw->ports, port_no); +} + +static void +call_local_port_changed_callbacks(struct port_watcher *pw) +{ + char name[OFP_MAX_PORT_NAME_LEN + 1]; + const struct ofp_phy_port *port; + int i; + + /* Pass the local port to the callbacks, if it exists. + Pass a null pointer if there is no local port. */ + port = lookup_port(pw, OFPP_LOCAL); + + /* Log the name of the local port. */ + if (port) { + get_port_name(port, name, sizeof name); + } else { + name[0] = '\0'; + } + if (strcmp(pw->local_port_name, name)) { + if (name[0]) { + VLOG_WARN("Identified data path local port as \"%s\".", name); + } else { + VLOG_WARN("Data path has no local port."); + } + strcpy(pw->local_port_name, name); + } + + /* Invoke callbacks. */ + for (i = 0; i < pw->n_local_cbs; i++) { + local_port_changed_cb_func *cb = pw->local_cbs[i].local_port_changed; + (cb)(port, pw->local_cbs[i].aux); + } +} + +static void +update_phy_port(struct port_watcher *pw, struct ofp_phy_port *opp, + uint8_t reason) +{ + struct ofp_phy_port *old; + uint16_t port_no; + + port_no = ntohs(opp->port_no); + old = lookup_port(pw, port_no); + + if (reason == OFPPR_DELETE && old) { + call_port_changed_callbacks(pw, port_no, old, NULL); + free(old); + port_array_set(&pw->ports, port_no, NULL); + } else if (reason == OFPPR_MODIFY || reason == OFPPR_ADD) { + if (old) { + uint32_t s_mask = htonl(OFPPS_STP_MASK); + opp->state = (opp->state & ~s_mask) | (old->state & s_mask); + } + if (!old || opp_differs(opp, old)) { + struct ofp_phy_port new = *opp; + sanitize_opp(&new); + call_port_changed_callbacks(pw, port_no, old, &new); + if (old) { + *old = new; + } else { + port_array_set(&pw->ports, port_no, xmemdup(&new, sizeof new)); + } + } + } +} + +static bool +port_watcher_local_packet_cb(struct relay *r, void *pw_) +{ + struct port_watcher *pw = pw_; + struct ofpbuf *msg = r->halves[HALF_LOCAL].rxbuf; + struct ofp_header *oh = msg->data; + + if (oh->type == OFPT_FEATURES_REPLY + && msg->size >= offsetof(struct ofp_switch_features, ports)) { + struct ofp_switch_features *osf = msg->data; + bool seen[PORT_ARRAY_SIZE]; + struct ofp_phy_port *p; + unsigned int port_no; + size_t n_ports; + size_t i; + + pw->got_feature_reply = true; + if (pw->datapath_id != osf->datapath_id) { + pw->datapath_id = osf->datapath_id; + VLOG_WARN("Datapath id is %012"PRIx64, ntohll(pw->datapath_id)); + } + + /* Update each port included in the message. */ + memset(seen, false, sizeof seen); + n_ports = ((msg->size - offsetof(struct ofp_switch_features, ports)) + / sizeof *osf->ports); + for (i = 0; i < n_ports; i++) { + struct ofp_phy_port *opp = &osf->ports[i]; + update_phy_port(pw, opp, OFPPR_MODIFY); + seen[ntohs(opp->port_no)] = true; + } + + /* Delete all the ports not included in the message. */ + for (p = port_array_first(&pw->ports, &port_no); p; + p = port_array_next(&pw->ports, &port_no)) { + if (!seen[port_no]) { + update_phy_port(pw, p, OFPPR_DELETE); + } + } + + call_local_port_changed_callbacks(pw); + } else if (oh->type == OFPT_PORT_STATUS + && msg->size >= sizeof(struct ofp_port_status)) { + struct ofp_port_status *ops = msg->data; + update_phy_port(pw, &ops->desc, ops->reason); + if (ops->desc.port_no == htons(OFPP_LOCAL)) { + call_local_port_changed_callbacks(pw); + } + } + return false; +} + +static bool +port_watcher_remote_packet_cb(struct relay *r, void *pw_) +{ + struct port_watcher *pw = pw_; + struct ofpbuf *msg = r->halves[HALF_REMOTE].rxbuf; + struct ofp_header *oh = msg->data; + + if (oh->type == OFPT_PORT_MOD + && msg->size >= sizeof(struct ofp_port_mod)) { + struct ofp_port_mod *opm = msg->data; + uint16_t port_no = ntohs(opm->port_no); + struct ofp_phy_port *pw_opp = lookup_port(pw, port_no); + if (pw_opp->port_no != htons(OFPP_NONE)) { + struct ofp_phy_port old = *pw_opp; + pw_opp->config = ((pw_opp->config & ~opm->mask) + | (opm->config & opm->mask)); + call_port_changed_callbacks(pw, port_no, &old, pw_opp); + if (pw_opp->port_no == htons(OFPP_LOCAL)) { + call_local_port_changed_callbacks(pw); + } + } + } + return false; +} + +static void +port_watcher_periodic_cb(void *pw_) +{ + struct port_watcher *pw = pw_; + + if (!pw->got_feature_reply + && time_now() >= pw->last_feature_request + 5 + && rconn_is_connected(pw->local_rconn)) { + struct ofpbuf *b; + make_openflow(sizeof(struct ofp_header), OFPT_FEATURES_REQUEST, &b); + rconn_send_with_limit(pw->local_rconn, b, &pw->n_txq, 1); + pw->last_feature_request = time_now(); + } +} + +static void +port_watcher_wait_cb(void *pw_) +{ + struct port_watcher *pw = pw_; + if (!pw->got_feature_reply && rconn_is_connected(pw->local_rconn)) { + if (pw->last_feature_request != TIME_MIN) { + poll_timer_wait(pw->last_feature_request + 5 - time_now()); + } else { + poll_immediate_wake(); + } + } +} + +static void +put_duplexes(struct ds *ds, const char *name, uint32_t features, + uint32_t hd_bit, uint32_t fd_bit) +{ + if (features & (hd_bit | fd_bit)) { + ds_put_format(ds, " %s", name); + if (features & hd_bit) { + ds_put_cstr(ds, "(HD)"); + } + if (features & fd_bit) { + ds_put_cstr(ds, "(FD)"); + } + } +} + +static void +put_features(struct ds *ds, const char *name, uint32_t features) +{ + if (features & (OFPPF_10MB_HD | OFPPF_10MB_FD + | OFPPF_100MB_HD | OFPPF_100MB_FD + | OFPPF_1GB_HD | OFPPF_1GB_FD | OFPPF_10GB_FD)) { + ds_put_cstr(ds, name); + put_duplexes(ds, "10M", features, OFPPF_10MB_HD, OFPPF_10MB_FD); + put_duplexes(ds, "100M", features, + OFPPF_100MB_HD, OFPPF_100MB_FD); + put_duplexes(ds, "1G", features, OFPPF_100MB_HD, OFPPF_100MB_FD); + if (features & OFPPF_10GB_FD) { + ds_put_cstr(ds, " 10G"); + } + if (features & OFPPF_AUTONEG) { + ds_put_cstr(ds, " AUTO_NEG"); + } + if (features & OFPPF_PAUSE) { + ds_put_cstr(ds, " PAUSE"); + } + if (features & OFPPF_PAUSE_ASYM) { + ds_put_cstr(ds, " PAUSE_ASYM"); + } + } +} + +static void +log_port_status(uint16_t port_no, + const struct ofp_phy_port *old, + const struct ofp_phy_port *new, + void *aux) +{ + if (VLOG_IS_DBG_ENABLED()) { + if (old && new && (opp_differs(old, new) + == ((old->config != new->config) + + (old->state != new->state)))) + { + /* Don't care if only state or config changed. */ + } else if (!new) { + if (old) { + VLOG_DBG("Port %d deleted", port_no); + } + } else { + struct ds ds = DS_EMPTY_INITIALIZER; + uint32_t curr = ntohl(new->curr); + uint32_t supported = ntohl(new->supported); + ds_put_format(&ds, "\"%s\", "ETH_ADDR_FMT, new->name, + ETH_ADDR_ARGS(new->hw_addr)); + if (curr) { + put_features(&ds, ", current", curr); + } + if (supported) { + put_features(&ds, ", supports", supported); + } + VLOG_DBG("Port %d %s: %s", + port_no, old ? "changed" : "added", ds_cstr(&ds)); + ds_destroy(&ds); + } + } +} + +void +port_watcher_register_callback(struct port_watcher *pw, + port_changed_cb_func *port_changed, + void *aux) +{ + assert(pw->n_cbs < ARRAY_SIZE(pw->cbs)); + pw->cbs[pw->n_cbs].port_changed = port_changed; + pw->cbs[pw->n_cbs].aux = aux; + pw->n_cbs++; +} + +void +port_watcher_register_local_port_callback(struct port_watcher *pw, + local_port_changed_cb_func *cb, + void *aux) +{ + assert(pw->n_local_cbs < ARRAY_SIZE(pw->local_cbs)); + pw->local_cbs[pw->n_local_cbs].local_port_changed = cb; + pw->local_cbs[pw->n_local_cbs].aux = aux; + pw->n_local_cbs++; +} + +uint32_t +port_watcher_get_config(const struct port_watcher *pw, uint16_t port_no) +{ + struct ofp_phy_port *p = lookup_port(pw, port_no); + return p ? ntohl(p->config) : 0; +} + +const char * +port_watcher_get_name(const struct port_watcher *pw, uint16_t port_no) +{ + struct ofp_phy_port *p = lookup_port(pw, port_no); + return p ? (const char *) p->name : NULL; +} + +const uint8_t * +port_watcher_get_hwaddr(const struct port_watcher *pw, uint16_t port_no) +{ + struct ofp_phy_port *p = lookup_port(pw, port_no); + return p ? p->hw_addr : NULL; +} + +void +port_watcher_set_flags(struct port_watcher *pw, uint16_t port_no, + uint32_t config, uint32_t c_mask, + uint32_t state, uint32_t s_mask) +{ + struct ofp_phy_port old; + struct ofp_phy_port *p; + struct ofp_port_mod *opm; + struct ofp_port_status *ops; + struct ofpbuf *b; + + p = lookup_port(pw, port_no); + if (!p) { + return; + } + + if (!((ntohl(p->state) ^ state) & s_mask) + && (!((ntohl(p->config) ^ config) & c_mask))) { + return; + } + old = *p; + + /* Update our idea of the flags. */ + p->config = htonl((ntohl(p->config) & ~c_mask) | (config & c_mask)); + p->state = htonl((ntohl(p->state) & ~s_mask) | (state & s_mask)); + call_port_changed_callbacks(pw, port_no, &old, p); + + /* Change the flags in the datapath. */ + opm = make_openflow(sizeof *opm, OFPT_PORT_MOD, &b); + opm->port_no = p->port_no; + memcpy(opm->hw_addr, p->hw_addr, OFP_ETH_ALEN); + opm->config = p->config; + opm->mask = htonl(c_mask); + opm->advertise = htonl(0); + rconn_send(pw->local_rconn, b, NULL); + + /* Notify the controller that the flags changed. */ + ops = make_openflow(sizeof *ops, OFPT_PORT_STATUS, &b); + ops->reason = OFPPR_MODIFY; + ops->desc = *p; + rconn_send(pw->remote_rconn, b, NULL); +} + +bool +port_watcher_is_ready(const struct port_watcher *pw) +{ + return pw->got_feature_reply; +} + +struct hook +port_watcher_create(struct rconn *local_rconn, struct rconn *remote_rconn, + struct port_watcher **pwp) +{ + struct port_watcher *pw; + + pw = *pwp = xcalloc(1, sizeof *pw); + pw->local_rconn = local_rconn; + pw->remote_rconn = remote_rconn; + pw->last_feature_request = TIME_MIN; + port_array_init(&pw->ports); + pw->local_port_name[0] = '\0'; + port_watcher_register_callback(pw, log_port_status, NULL); + return make_hook(port_watcher_local_packet_cb, + port_watcher_remote_packet_cb, + port_watcher_periodic_cb, + port_watcher_wait_cb, pw); +} diff --git a/secchan/port-watcher.h b/secchan/port-watcher.h new file mode 100644 index 00000000..e5758bb6 --- /dev/null +++ b/secchan/port-watcher.h @@ -0,0 +1,76 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#ifndef PORT_WATCHER_H +#define PORT_WATCHER_H 1 + +#include +#include "compiler.h" +#include "secchan.h" + +struct ofp_phy_port; +struct port_watcher; + +struct hook port_watcher_create(struct rconn *local, + struct rconn *remote, + struct port_watcher **); +bool port_watcher_is_ready(const struct port_watcher *); +uint32_t port_watcher_get_config(const struct port_watcher *, + uint16_t port_no); +const char *port_watcher_get_name(const struct port_watcher *, + uint16_t port_no) UNUSED; +const uint8_t *port_watcher_get_hwaddr(const struct port_watcher *, + uint16_t port_no); +void port_watcher_set_flags(struct port_watcher *, uint16_t port_no, + uint32_t config, uint32_t c_mask, + uint32_t state, uint32_t s_mask); + +typedef void port_changed_cb_func(uint16_t port_no, + const struct ofp_phy_port *old, + const struct ofp_phy_port *new, + void *aux); + +void port_watcher_register_callback(struct port_watcher *, + port_changed_cb_func *port_changed, + void *aux); + +typedef void local_port_changed_cb_func(const struct ofp_phy_port *new, + void *aux); + +void port_watcher_register_local_port_callback(struct port_watcher *pw, + local_port_changed_cb_func *cb, + void *aux); + +void get_port_name(const struct ofp_phy_port *, char *name, size_t name_size); + +#endif /* port-watcher.h */ diff --git a/secchan/ratelimit.c b/secchan/ratelimit.c new file mode 100644 index 00000000..ee25f16b --- /dev/null +++ b/secchan/ratelimit.c @@ -0,0 +1,249 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#include +#include "ratelimit.h" +#include +#include +#include "ofpbuf.h" +#include "openflow.h" +#include "poll-loop.h" +#include "queue.h" +#include "rconn.h" +#include "secchan.h" +#include "status.h" +#include "timeval.h" +#include "vconn.h" + +struct rate_limiter { + const struct settings *s; + struct rconn *remote_rconn; + + /* One queue per physical port. */ + struct ofp_queue queues[OFPP_MAX]; + int n_queued; /* Sum over queues[*].n. */ + int next_tx_port; /* Next port to check in round-robin. */ + + /* Token bucket. + * + * It costs 1000 tokens to send a single packet_in message. A single token + * per message would be more straightforward, but this choice lets us avoid + * round-off error in refill_bucket()'s calculation of how many tokens to + * add to the bucket, since no division step is needed. */ + long long int last_fill; /* Time at which we last added tokens. */ + int tokens; /* Current number of tokens. */ + + /* Transmission queue. */ + int n_txq; /* No. of packets waiting in rconn for tx. */ + + /* Statistics reporting. */ + unsigned long long n_normal; /* # txed w/o rate limit queuing. */ + unsigned long long n_limited; /* # queued for rate limiting. */ + unsigned long long n_queue_dropped; /* # dropped due to queue overflow. */ + unsigned long long n_tx_dropped; /* # dropped due to tx overflow. */ +}; + +/* Drop a packet from the longest queue in 'rl'. */ +static void +drop_packet(struct rate_limiter *rl) +{ + struct ofp_queue *longest; /* Queue currently selected as longest. */ + int n_longest; /* # of queues of same length as 'longest'. */ + struct ofp_queue *q; + + longest = &rl->queues[0]; + n_longest = 1; + for (q = &rl->queues[0]; q < &rl->queues[OFPP_MAX]; q++) { + if (longest->n < q->n) { + longest = q; + n_longest = 1; + } else if (longest->n == q->n) { + n_longest++; + + /* Randomly select one of the longest queues, with a uniform + * distribution (Knuth algorithm 3.4.2R). */ + if (!random_range(n_longest)) { + longest = q; + } + } + } + + /* FIXME: do we want to pop the tail instead? */ + ofpbuf_delete(queue_pop_head(longest)); + rl->n_queued--; +} + +/* Remove and return the next packet to transmit (in round-robin order). */ +static struct ofpbuf * +dequeue_packet(struct rate_limiter *rl) +{ + unsigned int i; + + for (i = 0; i < OFPP_MAX; i++) { + unsigned int port = (rl->next_tx_port + i) % OFPP_MAX; + struct ofp_queue *q = &rl->queues[port]; + if (q->n) { + rl->next_tx_port = (port + 1) % OFPP_MAX; + rl->n_queued--; + return queue_pop_head(q); + } + } + NOT_REACHED(); +} + +/* Add tokens to the bucket based on elapsed time. */ +static void +refill_bucket(struct rate_limiter *rl) +{ + const struct settings *s = rl->s; + long long int now = time_msec(); + long long int tokens = (now - rl->last_fill) * s->rate_limit + rl->tokens; + if (tokens >= 1000) { + rl->last_fill = now; + rl->tokens = MIN(tokens, s->burst_limit * 1000); + } +} + +/* Attempts to remove enough tokens from 'rl' to transmit a packet. Returns + * true if successful, false otherwise. (In the latter case no tokens are + * removed.) */ +static bool +get_token(struct rate_limiter *rl) +{ + if (rl->tokens >= 1000) { + rl->tokens -= 1000; + return true; + } else { + return false; + } +} + +static bool +rate_limit_local_packet_cb(struct relay *r, void *rl_) +{ + struct rate_limiter *rl = rl_; + const struct settings *s = rl->s; + struct ofp_packet_in *opi; + + opi = get_ofp_packet_in(r); + if (!opi) { + return false; + } + + if (!rl->n_queued && get_token(rl)) { + /* In the common case where we are not constrained by the rate limit, + * let the packet take the normal path. */ + rl->n_normal++; + return false; + } else { + /* Otherwise queue it up for the periodic callback to drain out. */ + struct ofpbuf *msg = r->halves[HALF_LOCAL].rxbuf; + int port = ntohs(opi->in_port) % OFPP_MAX; + if (rl->n_queued >= s->burst_limit) { + drop_packet(rl); + } + queue_push_tail(&rl->queues[port], ofpbuf_clone(msg)); + rl->n_queued++; + rl->n_limited++; + return true; + } +} + +static void +rate_limit_status_cb(struct status_reply *sr, void *rl_) +{ + struct rate_limiter *rl = rl_; + + status_reply_put(sr, "normal=%llu", rl->n_normal); + status_reply_put(sr, "limited=%llu", rl->n_limited); + status_reply_put(sr, "queue-dropped=%llu", rl->n_queue_dropped); + status_reply_put(sr, "tx-dropped=%llu", rl->n_tx_dropped); +} + +static void +rate_limit_periodic_cb(void *rl_) +{ + struct rate_limiter *rl = rl_; + int i; + + /* Drain some packets out of the bucket if possible, but limit the number + * of iterations to allow other code to get work done too. */ + refill_bucket(rl); + for (i = 0; rl->n_queued && get_token(rl) && i < 50; i++) { + /* Use a small, arbitrary limit for the amount of queuing to do here, + * because the TCP connection is responsible for buffering and there is + * no point in trying to transmit faster than the TCP connection can + * handle. */ + struct ofpbuf *b = dequeue_packet(rl); + if (rconn_send_with_limit(rl->remote_rconn, b, &rl->n_txq, 10)) { + rl->n_tx_dropped++; + } + } +} + +static void +rate_limit_wait_cb(void *rl_) +{ + struct rate_limiter *rl = rl_; + if (rl->n_queued) { + if (rl->tokens >= 1000) { + /* We can transmit more packets as soon as we're called again. */ + poll_immediate_wake(); + } else { + /* We have to wait for the bucket to re-fill. We could calculate + * the exact amount of time here for increased smoothness. */ + poll_timer_wait(TIME_UPDATE_INTERVAL / 2); + } + } +} + +struct hook +rate_limit_hook_create(const struct settings *s, struct switch_status *ss, + struct rconn *local, struct rconn *remote) +{ + struct rate_limiter *rl; + size_t i; + + rl = xcalloc(1, sizeof *rl); + rl->s = s; + rl->remote_rconn = remote; + for (i = 0; i < ARRAY_SIZE(rl->queues); i++) { + queue_init(&rl->queues[i]); + } + rl->last_fill = time_msec(); + rl->tokens = s->rate_limit * 100; + switch_status_register_category(ss, "rate-limit", + rate_limit_status_cb, rl); + return make_hook(rate_limit_local_packet_cb, NULL, rate_limit_periodic_cb, + rate_limit_wait_cb, rl); +} diff --git a/secchan/ratelimit.h b/secchan/ratelimit.h new file mode 100644 index 00000000..e3a3f8f5 --- /dev/null +++ b/secchan/ratelimit.h @@ -0,0 +1,46 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#ifndef RATELIMIT_H +#define RATELIMIT_H 1 + +struct rconn; +struct settings; +struct switch_status; + +struct hook rate_limit_hook_create(const struct settings *, + struct switch_status *, + struct rconn *local, + struct rconn *remote); + +#endif /* ratelimit.h */ diff --git a/secchan/secchan.c b/secchan/secchan.c index 37f109ad..e40183f2 100644 --- a/secchan/secchan.c +++ b/secchan/secchan.c @@ -32,114 +32,45 @@ */ #include +#include "secchan.h" #include #include #include -#include #include -#include -#include #include #include #include -#include -#include #include "command-line.h" #include "compiler.h" #include "daemon.h" -#include "dhcp-client.h" -#include "dhcp.h" -#include "dynamic-string.h" +#include "discovery.h" +#include "fail-open.h" #include "fault.h" -#include "flow.h" -#include "learning-switch.h" +#include "in-band.h" #include "list.h" -#include "mac-learning.h" -#include "netdev.h" -#include "nicira-ext.h" #include "ofpbuf.h" #include "openflow.h" #include "packets.h" +#include "port-watcher.h" #include "poll-loop.h" -#include "port-array.h" +#include "ratelimit.h" #include "rconn.h" -#include "stp.h" +#ifdef SUPPORT_SNAT +#include "snat.h" +#endif +#include "stp-secchan.h" +#include "status.h" #include "timeval.h" #include "util.h" #include "vconn-ssl.h" #include "vconn.h" #include "vlog-socket.h" -#include "xtoxll.h" #include "vlog.h" #define THIS_MODULE VLM_secchan -/* Behavior when the connection to the controller fails. */ -enum fail_mode { - FAIL_OPEN, /* Act as learning switch. */ - FAIL_CLOSED /* Drop all packets. */ -}; - -/* Maximum number of management connection listeners. */ -#define MAX_MGMT 8 - -/* Settings that may be configured by the user. */ -struct settings { - /* Overall mode of operation. */ - bool discovery; /* Discover the controller automatically? */ - bool in_band; /* Connect to controller in-band? */ - - /* Related vconns and network devices. */ - const char *dp_name; /* Local datapath. */ - const char *controller_name; /* Controller (if not discovery mode). */ - const char *listener_names[MAX_MGMT]; /* Listen for mgmt connections. */ - size_t n_listeners; /* Number of mgmt connection listeners. */ - const char *monitor_name; /* Listen for traffic monitor connections. */ - - /* Failure behavior. */ - enum fail_mode fail_mode; /* Act as learning switch if no controller? */ - int max_idle; /* Idle time for flows in fail-open mode. */ - int probe_interval; /* # seconds idle before sending echo request. */ - int max_backoff; /* Max # seconds between connection attempts. */ - - /* Packet-in rate-limiting. */ - int rate_limit; /* Tokens added to bucket per second. */ - int burst_limit; /* Maximum number token bucket size. */ - - /* Discovery behavior. */ - regex_t accept_controller_regex; /* Controller vconns to accept. */ - const char *accept_controller_re; /* String version of regex. */ - bool update_resolv_conf; /* Update /etc/resolv.conf? */ - - /* Spanning tree protocol. */ - bool enable_stp; -}; - -struct half { - struct rconn *rconn; - struct ofpbuf *rxbuf; - int n_txq; /* No. of packets queued for tx on 'rconn'. */ -}; - -struct relay { - struct list node; - -#define HALF_LOCAL 0 -#define HALF_REMOTE 1 - struct half halves[2]; - - bool is_mgmt_conn; -}; - -struct hook { - bool (*packet_cb[2])(struct relay *, void *aux); - void (*periodic_cb)(void *aux); - void (*wait_cb)(void *aux); - void *aux; -}; - -static struct vlog_rate_limit vrl = VLOG_RATE_LIMIT_INIT(60, 60); +static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(60, 60); static void parse_options(int argc, char *argv[], struct settings *); static void usage(void) NO_RETURN; @@ -154,77 +85,6 @@ static void relay_run(struct relay *, const struct hook[], size_t n_hooks); static void relay_wait(struct relay *); static void relay_destroy(struct relay *); -static struct hook make_hook(bool (*local_packet_cb)(struct relay *, void *), - bool (*remote_packet_cb)(struct relay *, void *), - void (*periodic_cb)(void *), - void (*wait_cb)(void *), - void *aux); -static struct ofp_packet_in *get_ofp_packet_in(struct relay *); -static bool get_ofp_packet_eth_header(struct relay *, struct ofp_packet_in **, - struct eth_header **); -static void get_ofp_packet_payload(struct ofp_packet_in *, struct ofpbuf *); - -struct switch_status; -struct status_reply; -static struct hook switch_status_hook_create(const struct settings *, - struct switch_status **); -static void switch_status_register_category(struct switch_status *, - const char *category, - void (*cb)(struct status_reply *, - void *aux), - void *aux); -static void status_reply_put(struct status_reply *, const char *, ...) - PRINTF_FORMAT(2, 3); - -static void rconn_status_cb(struct status_reply *, void *rconn_); - -struct port_watcher; -static struct discovery *discovery_init(const struct settings *, - struct port_watcher *, - struct switch_status *); -static void discovery_question_connectivity(struct discovery *); -static bool discovery_run(struct discovery *, char **controller_name); -static void discovery_wait(struct discovery *); - -static struct hook in_band_hook_create(const struct settings *, - struct switch_status *, - struct port_watcher *, - struct rconn *remote); - -static struct hook port_watcher_create(struct rconn *local, - struct rconn *remote, - struct port_watcher **); -static uint32_t port_watcher_get_config(const struct port_watcher *, - uint16_t port_no); -static const char *port_watcher_get_name(const struct port_watcher *, - uint16_t port_no) UNUSED; -static const uint8_t *port_watcher_get_hwaddr(const struct port_watcher *, - uint16_t port_no); -static void port_watcher_set_flags(struct port_watcher *, uint16_t port_no, - uint32_t config, uint32_t c_mask, - uint32_t state, uint32_t s_mask); - -#ifdef SUPPORT_SNAT -static struct hook snat_hook_create(struct port_watcher *pw); -#endif - -static struct hook stp_hook_create(const struct settings *, - struct port_watcher *, - struct rconn *local, struct rconn *remote); - -static struct hook fail_open_hook_create(const struct settings *, - struct switch_status *, - struct rconn *local, - struct rconn *remote); -static struct hook rate_limit_hook_create(const struct settings *, - struct switch_status *, - struct rconn *local, - struct rconn *remote); - - -static void modify_dhcp_request(struct dhcp_msg *, void *aux); -static bool validate_dhcp_offer(const struct dhcp_msg *, void *aux); - int main(int argc, char *argv[]) { @@ -408,12 +268,12 @@ accept_vconn(struct pvconn *pvconn) retval = pvconn_accept(pvconn, OFP_VERSION, &new); if (retval && retval != EAGAIN) { - VLOG_WARN_RL(&vrl, "accept failed (%s)", strerror(retval)); + VLOG_WARN_RL(&rl, "accept failed (%s)", strerror(retval)); } return new; } -static struct hook +struct hook make_hook(bool (*local_packet_cb)(struct relay *, void *aux), bool (*remote_packet_cb)(struct relay *, void *aux), void (*periodic_cb)(void *aux), @@ -429,7 +289,7 @@ make_hook(bool (*local_packet_cb)(struct relay *, void *aux), return h; } -static struct ofp_packet_in * +struct ofp_packet_in * get_ofp_packet_in(struct relay *r) { struct ofpbuf *msg = r->halves[HALF_LOCAL].rxbuf; @@ -445,7 +305,7 @@ get_ofp_packet_in(struct relay *r) return NULL; } -static bool +bool get_ofp_packet_eth_header(struct relay *r, struct ofp_packet_in **opip, struct eth_header **ethp) { @@ -458,7 +318,6 @@ get_ofp_packet_eth_header(struct relay *r, struct ofp_packet_in **opip, } return false; } - /* OpenFlow message relaying. */ @@ -487,14 +346,14 @@ relay_accept(const struct settings *s, struct pvconn *pvconn) /* We don't have a way to specify not to subscribe to those messages * for other transports. (That's a defect: really this should be in * the OpenFlow protocol, not the Netlink transport). */ - VLOG_WARN_RL(&vrl, "new management connection will receive " + VLOG_WARN_RL(&rl, "new management connection will receive " "asynchronous messages"); vconn_name = xstrdup(s->dp_name); } retval = vconn_open(vconn_name, OFP_VERSION, &new_local); if (retval) { - VLOG_ERR_RL(&vrl, "could not connect to %s (%s)", + VLOG_ERR_RL(&rl, "could not connect to %s (%s)", vconn_name, strerror(retval)); vconn_close(new_remote); free(vconn_name); @@ -612,1891 +471,6 @@ relay_destroy(struct relay *r) free(r); } -/* Port status watcher. */ - -typedef void port_changed_cb_func(uint16_t port_no, - const struct ofp_phy_port *old, - const struct ofp_phy_port *new, - void *aux); - -struct port_watcher_cb { - port_changed_cb_func *port_changed; - void *aux; -}; - -typedef void local_port_changed_cb_func(const struct ofp_phy_port *new, - void *aux); - -struct port_watcher_local_cb { - local_port_changed_cb_func *local_port_changed; - void *aux; -}; - -struct port_watcher { - struct rconn *local_rconn; - struct rconn *remote_rconn; - struct port_array ports; - time_t last_feature_request; - bool got_feature_reply; - uint64_t datapath_id; - int n_txq; - struct port_watcher_cb cbs[2]; - int n_cbs; - struct port_watcher_local_cb local_cbs[4]; - int n_local_cbs; - char local_port_name[OFP_MAX_PORT_NAME_LEN + 1]; -}; - -/* Returns the number of fields that differ from 'a' to 'b'. */ -static int -opp_differs(const struct ofp_phy_port *a, const struct ofp_phy_port *b) -{ - BUILD_ASSERT_DECL(sizeof *a == 48); /* Trips when we add or remove fields. */ - return ((a->port_no != b->port_no) - + (memcmp(a->hw_addr, b->hw_addr, sizeof a->hw_addr) != 0) - + (memcmp(a->name, b->name, sizeof a->name) != 0) - + (a->config != b->config) - + (a->state != b->state) - + (a->curr != b->curr) - + (a->advertised != b->advertised) - + (a->supported != b->supported) - + (a->peer != b->peer)); -} - -static void -sanitize_opp(struct ofp_phy_port *opp) -{ - size_t i; - - for (i = 0; i < sizeof opp->name; i++) { - char c = opp->name[i]; - if (c && (c < 0x20 || c > 0x7e)) { - opp->name[i] = '.'; - } - } - opp->name[sizeof opp->name - 1] = '\0'; -} - -static void -call_port_changed_callbacks(struct port_watcher *pw, int port_no, - const struct ofp_phy_port *old, - const struct ofp_phy_port *new) -{ - int i; - for (i = 0; i < pw->n_cbs; i++) { - port_changed_cb_func *port_changed = pw->cbs[i].port_changed; - (port_changed)(port_no, old, new, pw->cbs[i].aux); - } -} - -static void -get_port_name(const struct ofp_phy_port *port, char *name, size_t name_size) -{ - char *p; - - memcpy(name, port->name, MIN(name_size, sizeof port->name)); - name[name_size - 1] = '\0'; - for (p = name; *p != '\0'; p++) { - if (*p < 32 || *p > 126) { - *p = '.'; - } - } -} - -static struct ofp_phy_port * -lookup_port(const struct port_watcher *pw, uint16_t port_no) -{ - return port_array_get(&pw->ports, port_no); -} - -static void -call_local_port_changed_callbacks(struct port_watcher *pw) -{ - char name[OFP_MAX_PORT_NAME_LEN + 1]; - const struct ofp_phy_port *port; - int i; - - /* Pass the local port to the callbacks, if it exists. - Pass a null pointer if there is no local port. */ - port = lookup_port(pw, OFPP_LOCAL); - - /* Log the name of the local port. */ - if (port) { - get_port_name(port, name, sizeof name); - } else { - name[0] = '\0'; - } - if (strcmp(pw->local_port_name, name)) { - if (name[0]) { - VLOG_WARN("Identified data path local port as \"%s\".", name); - } else { - VLOG_WARN("Data path has no local port."); - } - strcpy(pw->local_port_name, name); - } - - /* Invoke callbacks. */ - for (i = 0; i < pw->n_local_cbs; i++) { - local_port_changed_cb_func *cb = pw->local_cbs[i].local_port_changed; - (cb)(port, pw->local_cbs[i].aux); - } -} - -static void -update_phy_port(struct port_watcher *pw, struct ofp_phy_port *opp, - uint8_t reason) -{ - struct ofp_phy_port *old; - uint16_t port_no; - - port_no = ntohs(opp->port_no); - old = lookup_port(pw, port_no); - - if (reason == OFPPR_DELETE && old) { - call_port_changed_callbacks(pw, port_no, old, NULL); - free(old); - port_array_set(&pw->ports, port_no, NULL); - } else if (reason == OFPPR_MODIFY || reason == OFPPR_ADD) { - if (old) { - uint32_t s_mask = htonl(OFPPS_STP_MASK); - opp->state = (opp->state & ~s_mask) | (old->state & s_mask); - } - if (!old || opp_differs(opp, old)) { - struct ofp_phy_port new = *opp; - sanitize_opp(&new); - call_port_changed_callbacks(pw, port_no, old, &new); - if (old) { - *old = new; - } else { - port_array_set(&pw->ports, port_no, xmemdup(&new, sizeof new)); - } - } - } -} - -static bool -port_watcher_local_packet_cb(struct relay *r, void *pw_) -{ - struct port_watcher *pw = pw_; - struct ofpbuf *msg = r->halves[HALF_LOCAL].rxbuf; - struct ofp_header *oh = msg->data; - - if (oh->type == OFPT_FEATURES_REPLY - && msg->size >= offsetof(struct ofp_switch_features, ports)) { - struct ofp_switch_features *osf = msg->data; - bool seen[PORT_ARRAY_SIZE]; - struct ofp_phy_port *p; - unsigned int port_no; - size_t n_ports; - size_t i; - - pw->got_feature_reply = true; - if (pw->datapath_id != osf->datapath_id) { - pw->datapath_id = osf->datapath_id; - VLOG_WARN("Datapath id is %012"PRIx64, ntohll(pw->datapath_id)); - } - - /* Update each port included in the message. */ - memset(seen, false, sizeof seen); - n_ports = ((msg->size - offsetof(struct ofp_switch_features, ports)) - / sizeof *osf->ports); - for (i = 0; i < n_ports; i++) { - struct ofp_phy_port *opp = &osf->ports[i]; - update_phy_port(pw, opp, OFPPR_MODIFY); - seen[ntohs(opp->port_no)] = true; - } - - /* Delete all the ports not included in the message. */ - for (p = port_array_first(&pw->ports, &port_no); p; - p = port_array_next(&pw->ports, &port_no)) { - if (!seen[port_no]) { - update_phy_port(pw, p, OFPPR_DELETE); - } - } - - call_local_port_changed_callbacks(pw); - } else if (oh->type == OFPT_PORT_STATUS - && msg->size >= sizeof(struct ofp_port_status)) { - struct ofp_port_status *ops = msg->data; - update_phy_port(pw, &ops->desc, ops->reason); - if (ops->desc.port_no == htons(OFPP_LOCAL)) { - call_local_port_changed_callbacks(pw); - } - } - return false; -} - -static bool -port_watcher_remote_packet_cb(struct relay *r, void *pw_) -{ - struct port_watcher *pw = pw_; - struct ofpbuf *msg = r->halves[HALF_REMOTE].rxbuf; - struct ofp_header *oh = msg->data; - - if (oh->type == OFPT_PORT_MOD - && msg->size >= sizeof(struct ofp_port_mod)) { - struct ofp_port_mod *opm = msg->data; - uint16_t port_no = ntohs(opm->port_no); - struct ofp_phy_port *pw_opp = lookup_port(pw, port_no); - if (pw_opp->port_no != htons(OFPP_NONE)) { - struct ofp_phy_port old = *pw_opp; - pw_opp->config = ((pw_opp->config & ~opm->mask) - | (opm->config & opm->mask)); - call_port_changed_callbacks(pw, port_no, &old, pw_opp); - if (pw_opp->port_no == htons(OFPP_LOCAL)) { - call_local_port_changed_callbacks(pw); - } - } - } - return false; -} - -static void -port_watcher_periodic_cb(void *pw_) -{ - struct port_watcher *pw = pw_; - - if (!pw->got_feature_reply - && time_now() >= pw->last_feature_request + 5 - && rconn_is_connected(pw->local_rconn)) { - struct ofpbuf *b; - make_openflow(sizeof(struct ofp_header), OFPT_FEATURES_REQUEST, &b); - rconn_send_with_limit(pw->local_rconn, b, &pw->n_txq, 1); - pw->last_feature_request = time_now(); - } -} - -static void -port_watcher_wait_cb(void *pw_) -{ - struct port_watcher *pw = pw_; - if (!pw->got_feature_reply && rconn_is_connected(pw->local_rconn)) { - if (pw->last_feature_request != TIME_MIN) { - poll_timer_wait(pw->last_feature_request + 5 - time_now()); - } else { - poll_immediate_wake(); - } - } -} - -static void -put_duplexes(struct ds *ds, const char *name, uint32_t features, - uint32_t hd_bit, uint32_t fd_bit) -{ - if (features & (hd_bit | fd_bit)) { - ds_put_format(ds, " %s", name); - if (features & hd_bit) { - ds_put_cstr(ds, "(HD)"); - } - if (features & fd_bit) { - ds_put_cstr(ds, "(FD)"); - } - } -} - -static void -put_features(struct ds *ds, const char *name, uint32_t features) -{ - if (features & (OFPPF_10MB_HD | OFPPF_10MB_FD - | OFPPF_100MB_HD | OFPPF_100MB_FD - | OFPPF_1GB_HD | OFPPF_1GB_FD | OFPPF_10GB_FD)) { - ds_put_cstr(ds, name); - put_duplexes(ds, "10M", features, OFPPF_10MB_HD, OFPPF_10MB_FD); - put_duplexes(ds, "100M", features, - OFPPF_100MB_HD, OFPPF_100MB_FD); - put_duplexes(ds, "1G", features, OFPPF_100MB_HD, OFPPF_100MB_FD); - if (features & OFPPF_10GB_FD) { - ds_put_cstr(ds, " 10G"); - } - if (features & OFPPF_AUTONEG) { - ds_put_cstr(ds, " AUTO_NEG"); - } - if (features & OFPPF_PAUSE) { - ds_put_cstr(ds, " PAUSE"); - } - if (features & OFPPF_PAUSE_ASYM) { - ds_put_cstr(ds, " PAUSE_ASYM"); - } - } -} - -static void -log_port_status(uint16_t port_no, - const struct ofp_phy_port *old, - const struct ofp_phy_port *new, - void *aux) -{ - if (VLOG_IS_DBG_ENABLED()) { - if (old && new && (opp_differs(old, new) - == ((old->config != new->config) - + (old->state != new->state)))) - { - /* Don't care if only state or config changed. */ - } else if (!new) { - if (old) { - VLOG_DBG("Port %d deleted", port_no); - } - } else { - struct ds ds = DS_EMPTY_INITIALIZER; - uint32_t curr = ntohl(new->curr); - uint32_t supported = ntohl(new->supported); - ds_put_format(&ds, "\"%s\", "ETH_ADDR_FMT, new->name, - ETH_ADDR_ARGS(new->hw_addr)); - if (curr) { - put_features(&ds, ", current", curr); - } - if (supported) { - put_features(&ds, ", supports", supported); - } - VLOG_DBG("Port %d %s: %s", - port_no, old ? "changed" : "added", ds_cstr(&ds)); - ds_destroy(&ds); - } - } -} - -static void -port_watcher_register_callback(struct port_watcher *pw, - port_changed_cb_func *port_changed, - void *aux) -{ - assert(pw->n_cbs < ARRAY_SIZE(pw->cbs)); - pw->cbs[pw->n_cbs].port_changed = port_changed; - pw->cbs[pw->n_cbs].aux = aux; - pw->n_cbs++; -} - -static void -port_watcher_register_local_port_callback(struct port_watcher *pw, - local_port_changed_cb_func *cb, - void *aux) -{ - assert(pw->n_local_cbs < ARRAY_SIZE(pw->local_cbs)); - pw->local_cbs[pw->n_local_cbs].local_port_changed = cb; - pw->local_cbs[pw->n_local_cbs].aux = aux; - pw->n_local_cbs++; -} - -static uint32_t -port_watcher_get_config(const struct port_watcher *pw, uint16_t port_no) -{ - struct ofp_phy_port *p = lookup_port(pw, port_no); - return p ? ntohl(p->config) : 0; -} - -static const char * -port_watcher_get_name(const struct port_watcher *pw, uint16_t port_no) -{ - struct ofp_phy_port *p = lookup_port(pw, port_no); - return p ? (const char *) p->name : NULL; -} - -static const uint8_t * -port_watcher_get_hwaddr(const struct port_watcher *pw, uint16_t port_no) -{ - struct ofp_phy_port *p = lookup_port(pw, port_no); - return p ? p->hw_addr : NULL; -} - -static void -port_watcher_set_flags(struct port_watcher *pw, uint16_t port_no, - uint32_t config, uint32_t c_mask, - uint32_t state, uint32_t s_mask) -{ - struct ofp_phy_port old; - struct ofp_phy_port *p; - struct ofp_port_mod *opm; - struct ofp_port_status *ops; - struct ofpbuf *b; - - p = lookup_port(pw, port_no); - if (!p) { - return; - } - - if (!((ntohl(p->state) ^ state) & s_mask) - && (!((ntohl(p->config) ^ config) & c_mask))) { - return; - } - old = *p; - - /* Update our idea of the flags. */ - p->config = htonl((ntohl(p->config) & ~c_mask) | (config & c_mask)); - p->state = htonl((ntohl(p->state) & ~s_mask) | (state & s_mask)); - call_port_changed_callbacks(pw, port_no, &old, p); - - /* Change the flags in the datapath. */ - opm = make_openflow(sizeof *opm, OFPT_PORT_MOD, &b); - opm->port_no = p->port_no; - memcpy(opm->hw_addr, p->hw_addr, OFP_ETH_ALEN); - opm->config = p->config; - opm->mask = htonl(c_mask); - opm->advertise = htonl(0); - rconn_send(pw->local_rconn, b, NULL); - - /* Notify the controller that the flags changed. */ - ops = make_openflow(sizeof *ops, OFPT_PORT_STATUS, &b); - ops->reason = OFPPR_MODIFY; - ops->desc = *p; - rconn_send(pw->remote_rconn, b, NULL); -} - -static bool -port_watcher_is_ready(const struct port_watcher *pw) -{ - return pw->got_feature_reply; -} - -static struct hook -port_watcher_create(struct rconn *local_rconn, struct rconn *remote_rconn, - struct port_watcher **pwp) -{ - struct port_watcher *pw; - - pw = *pwp = xcalloc(1, sizeof *pw); - pw->local_rconn = local_rconn; - pw->remote_rconn = remote_rconn; - pw->last_feature_request = TIME_MIN; - port_array_init(&pw->ports); - pw->local_port_name[0] = '\0'; - port_watcher_register_callback(pw, log_port_status, NULL); - return make_hook(port_watcher_local_packet_cb, - port_watcher_remote_packet_cb, - port_watcher_periodic_cb, - port_watcher_wait_cb, pw); -} - -#ifdef SUPPORT_SNAT -struct snat_port_conf { - struct list node; - struct nx_snat_config config; -}; - -struct snat_data { - struct port_watcher *pw; - struct list port_list; -}; - - -/* Source-NAT configuration monitor. */ -#define SNAT_CMD_LEN 1024 - -/* Commands to configure iptables. There is no programmatic interface - * to iptables from the kernel, so we're stuck making command-line calls - * in user-space. */ -#define SNAT_FLUSH_ALL_CMD "/sbin/iptables -t nat -F" -#define SNAT_FLUSH_CHAIN_CMD "/sbin/iptables -t nat -F of-snat-%s" - -#define SNAT_ADD_CHAIN_CMD "/sbin/iptables -t nat -N of-snat-%s" -#define SNAT_CONF_CHAIN_CMD "/sbin/iptables -t nat -A POSTROUTING -o %s -j of-snat-%s" - -#define SNAT_ADD_IP_CMD "/sbin/iptables -t nat -A of-snat-%s -j SNAT --to %s-%s" -#define SNAT_ADD_TCP_CMD "/sbin/iptables -t nat -A of-snat-%s -j SNAT -p TCP --to %s-%s:%d-%d" -#define SNAT_ADD_UDP_CMD "/sbin/iptables -t nat -A of-snat-%s -j SNAT -p UDP --to %s-%s:%d-%d" - -#define SNAT_UNSET_CHAIN_CMD "/sbin/iptables -t nat -D POSTROUTING -o %s -j of-snat-%s" -#define SNAT_DEL_CHAIN_CMD "/sbin/iptables -t nat -X of-snat-%s" - -static void -snat_add_rules(const struct nx_snat_config *sc, const uint8_t *dev_name) -{ - char command[SNAT_CMD_LEN]; - char ip_str_start[16]; - char ip_str_end[16]; - - - snprintf(ip_str_start, sizeof ip_str_start, IP_FMT, - IP_ARGS(&sc->ip_addr_start)); - snprintf(ip_str_end, sizeof ip_str_end, IP_FMT, - IP_ARGS(&sc->ip_addr_end)); - - /* We always attempt to remove existing entries, so that we know - * there's a pristine state for SNAT on the interface. We just ignore - * the results of these calls, since iptables will complain about - * any non-existent entries. */ - - /* Flush the chain that does the SNAT. */ - snprintf(command, sizeof(command), SNAT_FLUSH_CHAIN_CMD, dev_name); - system(command); - - /* We always try to create the a new chain. */ - snprintf(command, sizeof(command), SNAT_ADD_CHAIN_CMD, dev_name); - system(command); - - /* Disassociate any old SNAT chain from the POSTROUTING chain. */ - snprintf(command, sizeof(command), SNAT_UNSET_CHAIN_CMD, dev_name, - dev_name); - system(command); - - /* Associate the new chain with the POSTROUTING hook. */ - snprintf(command, sizeof(command), SNAT_CONF_CHAIN_CMD, dev_name, - dev_name); - if (system(command) != 0) { - VLOG_ERR("SNAT: problem flushing chain for add"); - return; - } - - /* If configured, restrict TCP source port ranges. */ - if ((sc->tcp_start != 0) && (sc->tcp_end != 0)) { - snprintf(command, sizeof(command), SNAT_ADD_TCP_CMD, - dev_name, ip_str_start, ip_str_end, - ntohs(sc->tcp_start), ntohs(sc->tcp_end)); - if (system(command) != 0) { - VLOG_ERR("SNAT: problem adding TCP rule"); - return; - } - } - - /* If configured, restrict UDP source port ranges. */ - if ((sc->udp_start != 0) && (sc->udp_end != 0)) { - snprintf(command, sizeof(command), SNAT_ADD_UDP_CMD, - dev_name, ip_str_start, ip_str_end, - ntohs(sc->udp_start), ntohs(sc->udp_end)); - if (system(command) != 0) { - VLOG_ERR("SNAT: problem adding UDP rule"); - return; - } - } - - /* Add a rule that covers all IP traffic that would not be covered - * by the prior TCP or UDP ranges. */ - snprintf(command, sizeof(command), SNAT_ADD_IP_CMD, - dev_name, ip_str_start, ip_str_end); - if (system(command) != 0) { - VLOG_ERR("SNAT: problem adding base rule"); - return; - } -} - -static void -snat_del_rules(const uint8_t *dev_name) -{ - char command[SNAT_CMD_LEN]; - - /* Flush the chain that does the SNAT. */ - snprintf(command, sizeof(command), SNAT_FLUSH_CHAIN_CMD, dev_name); - if (system(command) != 0) { - VLOG_ERR("SNAT: problem flushing chain for deletion"); - return; - } - - /* Disassociate the SNAT chain from the POSTROUTING chain. */ - snprintf(command, sizeof(command), SNAT_UNSET_CHAIN_CMD, dev_name, - dev_name); - if (system(command) != 0) { - VLOG_ERR("SNAT: problem unsetting chain"); - return; - } - - /* Now we can finally delete our SNAT chain. */ - snprintf(command, sizeof(command), SNAT_DEL_CHAIN_CMD, dev_name); - if (system(command) != 0) { - VLOG_ERR("SNAT: problem deleting chain"); - return; - } -} - -static void -snat_config(const struct nx_snat_config *sc, struct snat_data *snat) -{ - struct snat_port_conf *c, *spc=NULL; - const uint8_t *netdev_name; - - netdev_name = (const uint8_t *) port_watcher_get_name(snat->pw, - ntohs(sc->port)); - if (!netdev_name) { - return; - } - - LIST_FOR_EACH(c, struct snat_port_conf, node, &snat->port_list) { - if (c->config.port == sc->port) { - spc = c; - break; - } - } - - if (sc->command == NXSC_ADD) { - if (!spc) { - spc = xmalloc(sizeof(*c)); - if (!spc) { - VLOG_ERR("SNAT: no memory for new entry"); - return; - } - list_push_back(&snat->port_list, &spc->node); - } - memcpy(&spc->config, sc, sizeof(spc->config)); - snat_add_rules(sc, netdev_name); - } else if (spc) { - snat_del_rules(netdev_name); - list_remove(&spc->node); - } -} - -static bool -snat_remote_packet_cb(struct relay *r, void *snat_) -{ - struct snat_data *snat = snat_; - struct ofpbuf *msg = r->halves[HALF_REMOTE].rxbuf; - struct nicira_header *request = msg->data; - struct nx_act_config *nac = msg->data; - int n_configs, i; - - - if (msg->size < sizeof(struct nx_act_config)) { - return false; - } - request = msg->data; - if (request->header.type != OFPT_VENDOR - || request->vendor != htonl(NX_VENDOR_ID) - || request->subtype != htonl(NXT_ACT_SET_CONFIG)) { - return false; - } - - /* We're only interested in attempts to configure SNAT */ - if (nac->type != htons(NXAST_SNAT)) { - return false; - } - - n_configs = (msg->size - sizeof *nac) / sizeof *nac->snat; - for (i=0; isnat[i], snat); - } - - return false; -} - -static void -snat_port_changed_cb(uint16_t port_no, - const struct ofp_phy_port *old, - const struct ofp_phy_port *new, - void *snat_) -{ - struct snat_data *snat = snat_; - struct snat_port_conf *c; - - /* We're only interested in ports that went away */ - if (old && !new) { - return; - } - - LIST_FOR_EACH(c, struct snat_port_conf, node, &snat->port_list) { - if (c->config.port == old->port_no) { - snat_del_rules(old->name); - list_remove(&c->node); - return; - } - } -} - -static struct hook -snat_hook_create(struct port_watcher *pw) -{ - int ret; - struct snat_data *snat; - - ret = system(SNAT_FLUSH_ALL_CMD); - if (ret != 0) { - VLOG_ERR("SNAT: problem flushing tables"); - } - - snat = xcalloc(1, sizeof *snat); - snat->pw = pw; - list_init(&snat->port_list); - - port_watcher_register_callback(pw, snat_port_changed_cb, snat); - return make_hook(NULL, snat_remote_packet_cb, NULL, NULL, snat); -} -#endif /* SUPPORT_SNAT */ - -/* Spanning tree protocol. */ - -/* Extra time, in seconds, at boot before going into fail-open, to give the - * spanning tree protocol time to figure out the network layout. */ -#define STP_EXTRA_BOOT_TIME 30 - -struct stp_data { - struct stp *stp; - struct port_watcher *pw; - struct rconn *local_rconn; - struct rconn *remote_rconn; - long long int last_tick_256ths; - int n_txq; -}; - -static bool -stp_local_packet_cb(struct relay *r, void *stp_) -{ - struct ofpbuf *msg = r->halves[HALF_LOCAL].rxbuf; - struct ofp_header *oh; - struct stp_data *stp = stp_; - struct ofp_packet_in *opi; - struct eth_header *eth; - struct llc_header *llc; - struct ofpbuf payload; - uint16_t port_no; - struct flow flow; - - oh = msg->data; - if (oh->type == OFPT_FEATURES_REPLY - && msg->size >= offsetof(struct ofp_switch_features, ports)) { - struct ofp_switch_features *osf = msg->data; - osf->capabilities |= htonl(OFPC_STP); - return false; - } - - if (!get_ofp_packet_eth_header(r, &opi, ð) - || !eth_addr_equals(eth->eth_dst, stp_eth_addr)) { - return false; - } - - port_no = ntohs(opi->in_port); - if (port_no >= STP_MAX_PORTS) { - /* STP only supports 255 ports. */ - return false; - } - if (port_watcher_get_config(stp->pw, port_no) & OFPPC_NO_STP) { - /* We're not doing STP on this port. */ - return false; - } - - if (opi->reason == OFPR_ACTION) { - /* The controller set up a flow for this, so we won't intercept it. */ - return false; - } - - get_ofp_packet_payload(opi, &payload); - flow_extract(&payload, port_no, &flow); - if (flow.dl_type != htons(OFP_DL_TYPE_NOT_ETH_TYPE)) { - VLOG_DBG("non-LLC frame received on STP multicast address"); - return false; - } - llc = ofpbuf_at_assert(&payload, sizeof *eth, sizeof *llc); - if (llc->llc_dsap != STP_LLC_DSAP) { - VLOG_DBG("bad DSAP 0x%02"PRIx8" received on STP multicast address", - llc->llc_dsap); - return false; - } - - /* Trim off padding on payload. */ - if (payload.size > ntohs(eth->eth_type) + ETH_HEADER_LEN) { - payload.size = ntohs(eth->eth_type) + ETH_HEADER_LEN; - } - if (ofpbuf_try_pull(&payload, ETH_HEADER_LEN + LLC_HEADER_LEN)) { - struct stp_port *p = stp_get_port(stp->stp, port_no); - stp_received_bpdu(p, payload.data, payload.size); - } - - return true; -} - -static long long int -time_256ths(void) -{ - return time_msec() * 256 / 1000; -} - -static void -stp_periodic_cb(void *stp_) -{ - struct stp_data *stp = stp_; - long long int now_256ths = time_256ths(); - long long int elapsed_256ths = now_256ths - stp->last_tick_256ths; - struct stp_port *p; - - if (!port_watcher_is_ready(stp->pw)) { - /* Can't start STP until we know port flags, because port flags can - * disable STP. */ - return; - } - if (elapsed_256ths <= 0) { - return; - } - - stp_tick(stp->stp, MIN(INT_MAX, elapsed_256ths)); - stp->last_tick_256ths = now_256ths; - - while (stp_get_changed_port(stp->stp, &p)) { - int port_no = stp_port_no(p); - enum stp_state s_state = stp_port_get_state(p); - - if (s_state != STP_DISABLED) { - VLOG_WARN("STP: Port %d entered %s state", - port_no, stp_state_name(s_state)); - } - if (!(port_watcher_get_config(stp->pw, port_no) & OFPPC_NO_STP)) { - uint32_t p_config = 0; - uint32_t p_state; - switch (s_state) { - case STP_LISTENING: - p_state = OFPPS_STP_LISTEN; - break; - case STP_LEARNING: - p_state = OFPPS_STP_LEARN; - break; - case STP_DISABLED: - case STP_FORWARDING: - p_state = OFPPS_STP_FORWARD; - break; - case STP_BLOCKING: - p_state = OFPPS_STP_BLOCK; - break; - default: - VLOG_DBG_RL(&vrl, "STP: Port %d has bad state %x", - port_no, s_state); - p_state = OFPPS_STP_FORWARD; - break; - } - if (!stp_forward_in_state(s_state)) { - p_config = OFPPC_NO_FLOOD; - } - port_watcher_set_flags(stp->pw, port_no, - p_config, OFPPC_NO_FLOOD, - p_state, OFPPS_STP_MASK); - } else { - /* We don't own those flags. */ - } - } -} - -static void -stp_wait_cb(void *stp_ UNUSED) -{ - poll_timer_wait(1000); -} - -static void -send_bpdu(const void *bpdu, size_t bpdu_size, int port_no, void *stp_) -{ - struct stp_data *stp = stp_; - const uint8_t *port_mac; - struct eth_header *eth; - struct llc_header *llc; - struct ofpbuf pkt, *opo; - - port_mac = port_watcher_get_hwaddr(stp->pw, port_no); - if (!port_mac) { - VLOG_WARN_RL(&vrl, "cannot send BPDU on missing port %d", port_no); - return; - } - - /* Packet skeleton. */ - ofpbuf_init(&pkt, ETH_HEADER_LEN + LLC_HEADER_LEN + bpdu_size); - eth = ofpbuf_put_uninit(&pkt, sizeof *eth); - llc = ofpbuf_put_uninit(&pkt, sizeof *llc); - ofpbuf_put(&pkt, bpdu, bpdu_size); - - /* 802.2 header. */ - memcpy(eth->eth_dst, stp_eth_addr, ETH_ADDR_LEN); - memcpy(eth->eth_src, port_mac, ETH_ADDR_LEN); - eth->eth_type = htons(pkt.size - ETH_HEADER_LEN); - - /* LLC header. */ - llc->llc_dsap = STP_LLC_DSAP; - llc->llc_ssap = STP_LLC_SSAP; - llc->llc_cntl = STP_LLC_CNTL; - - opo = make_unbuffered_packet_out(&pkt, OFPP_NONE, port_no); - ofpbuf_uninit(&pkt); - rconn_send_with_limit(stp->local_rconn, opo, &stp->n_txq, OFPP_MAX); -} - -static bool -stp_is_port_supported(uint16_t port_no) -{ - return port_no < STP_MAX_PORTS; -} - -static void -stp_port_changed_cb(uint16_t port_no, - const struct ofp_phy_port *old, - const struct ofp_phy_port *new, - void *stp_) -{ - struct stp_data *stp = stp_; - struct stp_port *p; - - if (!stp_is_port_supported(port_no)) { - return; - } - - p = stp_get_port(stp->stp, port_no); - if (!new - || new->config & htonl(OFPPC_NO_STP | OFPPC_PORT_DOWN) - || new->state & htonl(OFPPS_LINK_DOWN)) { - stp_port_disable(p); - } else { - int speed = 0; - stp_port_enable(p); - if (new->curr & (OFPPF_10MB_HD | OFPPF_10MB_FD)) { - speed = 10; - } else if (new->curr & (OFPPF_100MB_HD | OFPPF_100MB_FD)) { - speed = 100; - } else if (new->curr & (OFPPF_1GB_HD | OFPPF_1GB_FD)) { - speed = 1000; - } else if (new->curr & OFPPF_100MB_FD) { - speed = 10000; - } - stp_port_set_speed(p, speed); - } -} - -static void -stp_local_port_changed_cb(const struct ofp_phy_port *port, void *stp_) -{ - struct stp_data *stp = stp_; - if (port) { - stp_set_bridge_id(stp->stp, eth_addr_to_uint64(port->hw_addr)); - } -} - -static struct hook -stp_hook_create(const struct settings *s, struct port_watcher *pw, - struct rconn *local, struct rconn *remote) -{ - uint8_t dpid[ETH_ADDR_LEN]; - struct stp_data *stp; - - stp = xcalloc(1, sizeof *stp); - eth_addr_random(dpid); - stp->stp = stp_create("stp", eth_addr_to_uint64(dpid), send_bpdu, stp); - stp->pw = pw; - stp->local_rconn = local; - stp->remote_rconn = remote; - stp->last_tick_256ths = time_256ths(); - - port_watcher_register_callback(pw, stp_port_changed_cb, stp); - port_watcher_register_local_port_callback(pw, stp_local_port_changed_cb, - stp); - return make_hook(stp_local_packet_cb, NULL, - stp_periodic_cb, stp_wait_cb, stp); -} - -/* In-band control. */ - -struct in_band_data { - const struct settings *s; - struct mac_learning *ml; - struct netdev *of_device; - struct rconn *controller; - int n_queued; -}; - -static void -queue_tx(struct rconn *rc, struct in_band_data *in_band, struct ofpbuf *b) -{ - rconn_send_with_limit(rc, b, &in_band->n_queued, 10); -} - -static const uint8_t * -get_controller_mac(struct in_band_data *in_band) -{ - static uint32_t ip, last_nonzero_ip; - static uint8_t mac[ETH_ADDR_LEN], last_nonzero_mac[ETH_ADDR_LEN]; - static time_t next_refresh = 0; - - uint32_t last_ip = ip; - - time_t now = time_now(); - - ip = rconn_get_ip(in_band->controller); - if (last_ip != ip || !next_refresh || now >= next_refresh) { - bool have_mac; - - /* Look up MAC address. */ - memset(mac, 0, sizeof mac); - if (ip && in_band->of_device) { - int retval = netdev_arp_lookup(in_band->of_device, ip, mac); - if (retval) { - VLOG_DBG_RL(&vrl, "cannot look up controller hw address " - "("IP_FMT"): %s", IP_ARGS(&ip), strerror(retval)); - } - } - have_mac = !eth_addr_is_zero(mac); - - /* Log changes in IP, MAC addresses. */ - if (ip && ip != last_nonzero_ip) { - VLOG_DBG("controller IP address changed from "IP_FMT - " to "IP_FMT, IP_ARGS(&last_nonzero_ip), IP_ARGS(&ip)); - last_nonzero_ip = ip; - } - if (have_mac && memcmp(last_nonzero_mac, mac, ETH_ADDR_LEN)) { - VLOG_DBG("controller MAC address changed from "ETH_ADDR_FMT" to " - ETH_ADDR_FMT, - ETH_ADDR_ARGS(last_nonzero_mac), ETH_ADDR_ARGS(mac)); - memcpy(last_nonzero_mac, mac, ETH_ADDR_LEN); - } - - /* Schedule next refresh. - * - * If we have an IP address but not a MAC address, then refresh - * quickly, since we probably will get a MAC address soon (via ARP). - * Otherwise, we can afford to wait a little while. */ - next_refresh = now + (!ip || have_mac ? 10 : 1); - } - return !eth_addr_is_zero(mac) ? mac : NULL; -} - -static bool -is_controller_mac(const uint8_t dl_addr[ETH_ADDR_LEN], - struct in_band_data *in_band) -{ - const uint8_t *mac = get_controller_mac(in_band); - return mac && eth_addr_equals(mac, dl_addr); -} - -static void -in_band_learn_mac(struct in_band_data *in_band, - uint16_t in_port, const uint8_t src_mac[ETH_ADDR_LEN]) -{ - if (mac_learning_learn(in_band->ml, src_mac, in_port)) { - VLOG_DBG_RL(&vrl, "learned that "ETH_ADDR_FMT" is on port %"PRIu16, - ETH_ADDR_ARGS(src_mac), in_port); - } -} - -static bool -in_band_local_packet_cb(struct relay *r, void *in_band_) -{ - struct in_band_data *in_band = in_band_; - struct rconn *rc = r->halves[HALF_LOCAL].rconn; - struct ofp_packet_in *opi; - struct eth_header *eth; - struct ofpbuf payload; - struct flow flow; - uint16_t in_port; - int out_port; - - if (!get_ofp_packet_eth_header(r, &opi, ð) || !in_band->of_device) { - return false; - } - in_port = ntohs(opi->in_port); - - /* Deal with local stuff. */ - if (in_port == OFPP_LOCAL) { - /* Sent by secure channel. */ - out_port = mac_learning_lookup(in_band->ml, eth->eth_dst); - } else if (eth_addr_equals(eth->eth_dst, - netdev_get_etheraddr(in_band->of_device))) { - /* Sent to secure channel. */ - out_port = OFPP_LOCAL; - in_band_learn_mac(in_band, in_port, eth->eth_src); - } else if (eth->eth_type == htons(ETH_TYPE_ARP) - && eth_addr_is_broadcast(eth->eth_dst) - && is_controller_mac(eth->eth_src, in_band)) { - /* ARP sent by controller. */ - out_port = OFPP_FLOOD; - } else if (is_controller_mac(eth->eth_dst, in_band) - || is_controller_mac(eth->eth_src, in_band)) { - /* Traffic to or from controller. Switch it by hand. */ - in_band_learn_mac(in_band, in_port, eth->eth_src); - out_port = mac_learning_lookup(in_band->ml, eth->eth_dst); - } else { - const uint8_t *controller_mac; - controller_mac = get_controller_mac(in_band); - if (eth->eth_type == htons(ETH_TYPE_ARP) - && eth_addr_is_broadcast(eth->eth_dst) - && is_controller_mac(eth->eth_src, in_band)) { - /* ARP sent by controller. */ - out_port = OFPP_FLOOD; - } else if (is_controller_mac(eth->eth_dst, in_band) - && in_port == mac_learning_lookup(in_band->ml, - controller_mac)) { - /* Drop controller traffic that arrives on the controller port. */ - out_port = -1; - } else { - return false; - } - } - - get_ofp_packet_payload(opi, &payload); - flow_extract(&payload, in_port, &flow); - if (in_port == out_port) { - /* The input and output port match. Set up a flow to drop packets. */ - queue_tx(rc, in_band, make_add_flow(&flow, ntohl(opi->buffer_id), - in_band->s->max_idle, 0)); - } else if (out_port != OFPP_FLOOD) { - /* The output port is known, so add a new flow. */ - queue_tx(rc, in_band, - make_add_simple_flow(&flow, ntohl(opi->buffer_id), - out_port, in_band->s->max_idle)); - - /* If the switch didn't buffer the packet, we need to send a copy. */ - if (ntohl(opi->buffer_id) == UINT32_MAX) { - queue_tx(rc, in_band, - make_unbuffered_packet_out(&payload, in_port, out_port)); - } - } else { - /* We don't know that MAC. Send along the packet without setting up a - * flow. */ - struct ofpbuf *b; - if (ntohl(opi->buffer_id) == UINT32_MAX) { - b = make_unbuffered_packet_out(&payload, in_port, out_port); - } else { - b = make_buffered_packet_out(ntohl(opi->buffer_id), - in_port, out_port); - } - queue_tx(rc, in_band, b); - } - return true; -} - -static void -in_band_status_cb(struct status_reply *sr, void *in_band_) -{ - struct in_band_data *in_band = in_band_; - struct in_addr local_ip; - uint32_t controller_ip; - const uint8_t *controller_mac; - - if (in_band->of_device) { - const uint8_t *mac = netdev_get_etheraddr(in_band->of_device); - if (netdev_get_in4(in_band->of_device, &local_ip)) { - status_reply_put(sr, "local-ip="IP_FMT, IP_ARGS(&local_ip.s_addr)); - } - status_reply_put(sr, "local-mac="ETH_ADDR_FMT, ETH_ADDR_ARGS(mac)); - - controller_ip = rconn_get_ip(in_band->controller); - if (controller_ip) { - status_reply_put(sr, "controller-ip="IP_FMT, - IP_ARGS(&controller_ip)); - } - controller_mac = get_controller_mac(in_band); - if (controller_mac) { - status_reply_put(sr, "controller-mac="ETH_ADDR_FMT, - ETH_ADDR_ARGS(controller_mac)); - } - } -} - -static void -get_ofp_packet_payload(struct ofp_packet_in *opi, struct ofpbuf *payload) -{ - payload->data = opi->data; - payload->size = ntohs(opi->header.length) - offsetof(struct ofp_packet_in, - data); -} - -static void -in_band_local_port_cb(const struct ofp_phy_port *port, void *in_band_) -{ - struct in_band_data *in_band = in_band_; - if (port) { - char name[sizeof port->name + 1]; - get_port_name(port, name, sizeof name); - - if (!in_band->of_device - || strcmp(netdev_get_name(in_band->of_device), name)) - { - int error; - netdev_close(in_band->of_device); - error = netdev_open(name, NETDEV_ETH_TYPE_NONE, - &in_band->of_device); - if (error) { - VLOG_ERR("failed to open in-band control network device " - "\"%s\": %s", name, strerror(errno)); - } - } - } else { - netdev_close(in_band->of_device); - in_band->of_device = NULL; - } -} - -static struct hook -in_band_hook_create(const struct settings *s, struct switch_status *ss, - struct port_watcher *pw, struct rconn *remote) -{ - struct in_band_data *in_band; - - in_band = xcalloc(1, sizeof *in_band); - in_band->s = s; - in_band->ml = mac_learning_create(); - in_band->of_device = NULL; - in_band->controller = remote; - switch_status_register_category(ss, "in-band", in_band_status_cb, in_band); - port_watcher_register_local_port_callback(pw, in_band_local_port_cb, - in_band); - return make_hook(in_band_local_packet_cb, NULL, NULL, NULL, in_band); -} - -/* Fail open support. */ - -struct fail_open_data { - const struct settings *s; - struct rconn *local_rconn; - struct rconn *remote_rconn; - struct lswitch *lswitch; - int last_disconn_secs; - time_t boot_deadline; -}; - -/* Causes 'r' to enter or leave fail-open mode, if appropriate. */ -static void -fail_open_periodic_cb(void *fail_open_) -{ - struct fail_open_data *fail_open = fail_open_; - int disconn_secs; - bool open; - - if (time_now() < fail_open->boot_deadline) { - return; - } - disconn_secs = rconn_failure_duration(fail_open->remote_rconn); - open = disconn_secs >= fail_open->s->probe_interval * 3; - if (open != (fail_open->lswitch != NULL)) { - if (!open) { - VLOG_WARN("No longer in fail-open mode"); - lswitch_destroy(fail_open->lswitch); - fail_open->lswitch = NULL; - } else { - VLOG_WARN("Could not connect to controller for %d seconds, " - "failing open", disconn_secs); - fail_open->lswitch = lswitch_create(fail_open->local_rconn, true, - fail_open->s->max_idle); - fail_open->last_disconn_secs = disconn_secs; - } - } else if (open && disconn_secs > fail_open->last_disconn_secs + 60) { - VLOG_WARN("Still in fail-open mode after %d seconds disconnected " - "from controller", disconn_secs); - fail_open->last_disconn_secs = disconn_secs; - } - if (fail_open->lswitch) { - lswitch_run(fail_open->lswitch, fail_open->local_rconn); - } -} - -static void -fail_open_wait_cb(void *fail_open_) -{ - struct fail_open_data *fail_open = fail_open_; - if (fail_open->lswitch) { - lswitch_wait(fail_open->lswitch); - } -} - -static bool -fail_open_local_packet_cb(struct relay *r, void *fail_open_) -{ - struct fail_open_data *fail_open = fail_open_; - if (rconn_is_connected(fail_open->remote_rconn) || !fail_open->lswitch) { - return false; - } else { - lswitch_process_packet(fail_open->lswitch, fail_open->local_rconn, - r->halves[HALF_LOCAL].rxbuf); - rconn_run(fail_open->local_rconn); - return true; - } -} - -static void -fail_open_status_cb(struct status_reply *sr, void *fail_open_) -{ - struct fail_open_data *fail_open = fail_open_; - const struct settings *s = fail_open->s; - int trigger_duration = s->probe_interval * 3; - int cur_duration = rconn_failure_duration(fail_open->remote_rconn); - - status_reply_put(sr, "trigger-duration=%d", trigger_duration); - status_reply_put(sr, "current-duration=%d", cur_duration); - status_reply_put(sr, "triggered=%s", - cur_duration >= trigger_duration ? "true" : "false"); - status_reply_put(sr, "max-idle=%d", s->max_idle); -} - -static struct hook -fail_open_hook_create(const struct settings *s, struct switch_status *ss, - struct rconn *local_rconn, struct rconn *remote_rconn) -{ - struct fail_open_data *fail_open = xmalloc(sizeof *fail_open); - fail_open->s = s; - fail_open->local_rconn = local_rconn; - fail_open->remote_rconn = remote_rconn; - fail_open->lswitch = NULL; - fail_open->boot_deadline = time_now() + s->probe_interval * 3; - if (s->enable_stp) { - fail_open->boot_deadline += STP_EXTRA_BOOT_TIME; - } - switch_status_register_category(ss, "fail-open", - fail_open_status_cb, fail_open); - return make_hook(fail_open_local_packet_cb, NULL, - fail_open_periodic_cb, fail_open_wait_cb, fail_open); -} - -struct rate_limiter { - const struct settings *s; - struct rconn *remote_rconn; - - /* One queue per physical port. */ - struct ofp_queue queues[OFPP_MAX]; - int n_queued; /* Sum over queues[*].n. */ - int next_tx_port; /* Next port to check in round-robin. */ - - /* Token bucket. - * - * It costs 1000 tokens to send a single packet_in message. A single token - * per message would be more straightforward, but this choice lets us avoid - * round-off error in refill_bucket()'s calculation of how many tokens to - * add to the bucket, since no division step is needed. */ - long long int last_fill; /* Time at which we last added tokens. */ - int tokens; /* Current number of tokens. */ - - /* Transmission queue. */ - int n_txq; /* No. of packets waiting in rconn for tx. */ - - /* Statistics reporting. */ - unsigned long long n_normal; /* # txed w/o rate limit queuing. */ - unsigned long long n_limited; /* # queued for rate limiting. */ - unsigned long long n_queue_dropped; /* # dropped due to queue overflow. */ - unsigned long long n_tx_dropped; /* # dropped due to tx overflow. */ -}; - -/* Drop a packet from the longest queue in 'rl'. */ -static void -drop_packet(struct rate_limiter *rl) -{ - struct ofp_queue *longest; /* Queue currently selected as longest. */ - int n_longest; /* # of queues of same length as 'longest'. */ - struct ofp_queue *q; - - longest = &rl->queues[0]; - n_longest = 1; - for (q = &rl->queues[0]; q < &rl->queues[OFPP_MAX]; q++) { - if (longest->n < q->n) { - longest = q; - n_longest = 1; - } else if (longest->n == q->n) { - n_longest++; - - /* Randomly select one of the longest queues, with a uniform - * distribution (Knuth algorithm 3.4.2R). */ - if (!random_range(n_longest)) { - longest = q; - } - } - } - - /* FIXME: do we want to pop the tail instead? */ - ofpbuf_delete(queue_pop_head(longest)); - rl->n_queued--; -} - -/* Remove and return the next packet to transmit (in round-robin order). */ -static struct ofpbuf * -dequeue_packet(struct rate_limiter *rl) -{ - unsigned int i; - - for (i = 0; i < OFPP_MAX; i++) { - unsigned int port = (rl->next_tx_port + i) % OFPP_MAX; - struct ofp_queue *q = &rl->queues[port]; - if (q->n) { - rl->next_tx_port = (port + 1) % OFPP_MAX; - rl->n_queued--; - return queue_pop_head(q); - } - } - NOT_REACHED(); -} - -/* Add tokens to the bucket based on elapsed time. */ -static void -refill_bucket(struct rate_limiter *rl) -{ - const struct settings *s = rl->s; - long long int now = time_msec(); - long long int tokens = (now - rl->last_fill) * s->rate_limit + rl->tokens; - if (tokens >= 1000) { - rl->last_fill = now; - rl->tokens = MIN(tokens, s->burst_limit * 1000); - } -} - -/* Attempts to remove enough tokens from 'rl' to transmit a packet. Returns - * true if successful, false otherwise. (In the latter case no tokens are - * removed.) */ -static bool -get_token(struct rate_limiter *rl) -{ - if (rl->tokens >= 1000) { - rl->tokens -= 1000; - return true; - } else { - return false; - } -} - -static bool -rate_limit_local_packet_cb(struct relay *r, void *rl_) -{ - struct rate_limiter *rl = rl_; - const struct settings *s = rl->s; - struct ofp_packet_in *opi; - - opi = get_ofp_packet_in(r); - if (!opi) { - return false; - } - - if (!rl->n_queued && get_token(rl)) { - /* In the common case where we are not constrained by the rate limit, - * let the packet take the normal path. */ - rl->n_normal++; - return false; - } else { - /* Otherwise queue it up for the periodic callback to drain out. */ - struct ofpbuf *msg = r->halves[HALF_LOCAL].rxbuf; - int port = ntohs(opi->in_port) % OFPP_MAX; - if (rl->n_queued >= s->burst_limit) { - drop_packet(rl); - } - queue_push_tail(&rl->queues[port], ofpbuf_clone(msg)); - rl->n_queued++; - rl->n_limited++; - return true; - } -} - -static void -rate_limit_status_cb(struct status_reply *sr, void *rl_) -{ - struct rate_limiter *rl = rl_; - - status_reply_put(sr, "normal=%llu", rl->n_normal); - status_reply_put(sr, "limited=%llu", rl->n_limited); - status_reply_put(sr, "queue-dropped=%llu", rl->n_queue_dropped); - status_reply_put(sr, "tx-dropped=%llu", rl->n_tx_dropped); -} - -static void -rate_limit_periodic_cb(void *rl_) -{ - struct rate_limiter *rl = rl_; - int i; - - /* Drain some packets out of the bucket if possible, but limit the number - * of iterations to allow other code to get work done too. */ - refill_bucket(rl); - for (i = 0; rl->n_queued && get_token(rl) && i < 50; i++) { - /* Use a small, arbitrary limit for the amount of queuing to do here, - * because the TCP connection is responsible for buffering and there is - * no point in trying to transmit faster than the TCP connection can - * handle. */ - struct ofpbuf *b = dequeue_packet(rl); - if (rconn_send_with_limit(rl->remote_rconn, b, &rl->n_txq, 10)) { - rl->n_tx_dropped++; - } - } -} - -static void -rate_limit_wait_cb(void *rl_) -{ - struct rate_limiter *rl = rl_; - if (rl->n_queued) { - if (rl->tokens >= 1000) { - /* We can transmit more packets as soon as we're called again. */ - poll_immediate_wake(); - } else { - /* We have to wait for the bucket to re-fill. We could calculate - * the exact amount of time here for increased smoothness. */ - poll_timer_wait(TIME_UPDATE_INTERVAL / 2); - } - } -} - -static struct hook -rate_limit_hook_create(const struct settings *s, struct switch_status *ss, - struct rconn *local, struct rconn *remote) -{ - struct rate_limiter *rl; - size_t i; - - rl = xcalloc(1, sizeof *rl); - rl->s = s; - rl->remote_rconn = remote; - for (i = 0; i < ARRAY_SIZE(rl->queues); i++) { - queue_init(&rl->queues[i]); - } - rl->last_fill = time_msec(); - rl->tokens = s->rate_limit * 100; - switch_status_register_category(ss, "rate-limit", - rate_limit_status_cb, rl); - return make_hook(rate_limit_local_packet_cb, NULL, rate_limit_periodic_cb, - rate_limit_wait_cb, rl); -} - -/* OFPST_SWITCH statistics. */ - -struct switch_status_category { - char *name; - void (*cb)(struct status_reply *, void *aux); - void *aux; -}; - -struct switch_status { - const struct settings *s; - time_t booted; - struct switch_status_category categories[8]; - int n_categories; -}; - -struct status_reply { - struct switch_status_category *category; - struct ds request; - struct ds output; -}; - -static bool -switch_status_remote_packet_cb(struct relay *r, void *ss_) -{ - struct switch_status *ss = ss_; - struct rconn *rc = r->halves[HALF_REMOTE].rconn; - struct ofpbuf *msg = r->halves[HALF_REMOTE].rxbuf; - struct switch_status_category *c; - struct nicira_header *request; - struct nicira_header *reply; - struct status_reply sr; - struct ofpbuf *b; - int retval; - - if (msg->size < sizeof(struct nicira_header)) { - return false; - } - request = msg->data; - if (request->header.type != OFPT_VENDOR - || request->vendor != htonl(NX_VENDOR_ID) - || request->subtype != htonl(NXT_STATUS_REQUEST)) { - return false; - } - - sr.request.string = (void *) (request + 1); - sr.request.length = msg->size - sizeof *request; - ds_init(&sr.output); - for (c = ss->categories; c < &ss->categories[ss->n_categories]; c++) { - if (!memcmp(c->name, sr.request.string, - MIN(strlen(c->name), sr.request.length))) { - sr.category = c; - c->cb(&sr, c->aux); - } - } - reply = make_openflow_xid(sizeof *reply + sr.output.length, - OFPT_VENDOR, request->header.xid, &b); - reply->vendor = htonl(NX_VENDOR_ID); - reply->subtype = htonl(NXT_STATUS_REPLY); - memcpy(reply + 1, sr.output.string, sr.output.length); - retval = rconn_send(rc, b, NULL); - if (retval && retval != EAGAIN) { - VLOG_WARN("send failed (%s)", strerror(retval)); - } - ds_destroy(&sr.output); - return true; -} - -static void -rconn_status_cb(struct status_reply *sr, void *rconn_) -{ - struct rconn *rconn = rconn_; - time_t now = time_now(); - - status_reply_put(sr, "name=%s", rconn_get_name(rconn)); - status_reply_put(sr, "state=%s", rconn_get_state(rconn)); - status_reply_put(sr, "backoff=%d", rconn_get_backoff(rconn)); - status_reply_put(sr, "is-connected=%s", - rconn_is_connected(rconn) ? "true" : "false"); - status_reply_put(sr, "sent-msgs=%u", rconn_packets_sent(rconn)); - status_reply_put(sr, "received-msgs=%u", rconn_packets_received(rconn)); - status_reply_put(sr, "attempted-connections=%u", - rconn_get_attempted_connections(rconn)); - status_reply_put(sr, "successful-connections=%u", - rconn_get_successful_connections(rconn)); - status_reply_put(sr, "last-connection=%ld", - (long int) (now - rconn_get_last_connection(rconn))); - status_reply_put(sr, "time-connected=%lu", - rconn_get_total_time_connected(rconn)); - status_reply_put(sr, "state-elapsed=%u", rconn_get_state_elapsed(rconn)); -} - -static void -config_status_cb(struct status_reply *sr, void *s_) -{ - const struct settings *s = s_; - size_t i; - - for (i = 0; i < s->n_listeners; i++) { - status_reply_put(sr, "management%zu=%s", i, s->listener_names[i]); - } - if (s->probe_interval) { - status_reply_put(sr, "probe-interval=%d", s->probe_interval); - } - if (s->max_backoff) { - status_reply_put(sr, "max-backoff=%d", s->max_backoff); - } -} - -static void -switch_status_cb(struct status_reply *sr, void *ss_) -{ - struct switch_status *ss = ss_; - time_t now = time_now(); - - status_reply_put(sr, "now=%ld", (long int) now); - status_reply_put(sr, "uptime=%ld", (long int) (now - ss->booted)); - status_reply_put(sr, "pid=%ld", (long int) getpid()); -} - -static struct hook -switch_status_hook_create(const struct settings *s, struct switch_status **ssp) -{ - struct switch_status *ss = xcalloc(1, sizeof *ss); - ss->s = s; - ss->booted = time_now(); - switch_status_register_category(ss, "config", - config_status_cb, (void *) s); - switch_status_register_category(ss, "switch", switch_status_cb, ss); - *ssp = ss; - return make_hook(NULL, switch_status_remote_packet_cb, NULL, NULL, ss); -} - -static void -switch_status_register_category(struct switch_status *ss, - const char *category, - void (*cb)(struct status_reply *, - void *aux), - void *aux) -{ - struct switch_status_category *c; - assert(ss->n_categories < ARRAY_SIZE(ss->categories)); - c = &ss->categories[ss->n_categories++]; - c->cb = cb; - c->aux = aux; - c->name = xstrdup(category); -} - -static void -status_reply_put(struct status_reply *sr, const char *content, ...) -{ - size_t old_length = sr->output.length; - size_t added; - va_list args; - - /* Append the status reply to the output. */ - ds_put_format(&sr->output, "%s.", sr->category->name); - va_start(args, content); - ds_put_format_valist(&sr->output, content, args); - va_end(args); - if (ds_last(&sr->output) != '\n') { - ds_put_char(&sr->output, '\n'); - } - - /* Drop what we just added if it doesn't match the request. */ - added = sr->output.length - old_length; - if (added < sr->request.length - || memcmp(&sr->output.string[old_length], - sr->request.string, sr->request.length)) { - ds_truncate(&sr->output, old_length); - } -} - - -/* Controller discovery. */ - -struct discovery -{ - const struct settings *s; - struct dhclient *dhcp; - int n_changes; -}; - -static void -discovery_status_cb(struct status_reply *sr, void *d_) -{ - struct discovery *d = d_; - - status_reply_put(sr, "accept-remote=%s", d->s->accept_controller_re); - status_reply_put(sr, "n-changes=%d", d->n_changes); - if (d->dhcp) { - status_reply_put(sr, "state=%s", dhclient_get_state(d->dhcp)); - status_reply_put(sr, "state-elapsed=%u", - dhclient_get_state_elapsed(d->dhcp)); - if (dhclient_is_bound(d->dhcp)) { - uint32_t ip = dhclient_get_ip(d->dhcp); - uint32_t netmask = dhclient_get_netmask(d->dhcp); - uint32_t router = dhclient_get_router(d->dhcp); - - const struct dhcp_msg *cfg = dhclient_get_config(d->dhcp); - uint32_t dns_server; - char *domain_name; - int i; - - status_reply_put(sr, "ip="IP_FMT, IP_ARGS(&ip)); - status_reply_put(sr, "netmask="IP_FMT, IP_ARGS(&netmask)); - if (router) { - status_reply_put(sr, "router="IP_FMT, IP_ARGS(&router)); - } - - for (i = 0; dhcp_msg_get_ip(cfg, DHCP_CODE_DNS_SERVER, i, - &dns_server); - i++) { - status_reply_put(sr, "dns%d="IP_FMT, i, IP_ARGS(&dns_server)); - } - - domain_name = dhcp_msg_get_string(cfg, DHCP_CODE_DOMAIN_NAME); - if (domain_name) { - status_reply_put(sr, "domain=%s", domain_name); - free(domain_name); - } - - status_reply_put(sr, "lease-remaining=%u", - dhclient_get_lease_remaining(d->dhcp)); - } - } -} - -static void -discovery_local_port_cb(const struct ofp_phy_port *port, void *d_) -{ - struct discovery *d = d_; - if (port) { - char name[OFP_MAX_PORT_NAME_LEN + 1]; - struct netdev *netdev; - int retval; - - /* Check that this was really a change. */ - get_port_name(port, name, sizeof name); - if (d->dhcp && !strcmp(netdev_get_name(dhclient_get_netdev(d->dhcp)), - name)) { - return; - } - - /* Destroy current DHCP client. */ - dhclient_destroy(d->dhcp); - d->dhcp = NULL; - - /* Bring local network device up. */ - retval = netdev_open(name, NETDEV_ETH_TYPE_NONE, &netdev); - if (retval) { - VLOG_ERR("Could not open %s device, discovery disabled: %s", - name, strerror(retval)); - return; - } - retval = netdev_turn_flags_on(netdev, NETDEV_UP, true); - if (retval) { - VLOG_ERR("Could not bring %s device up, discovery disabled: %s", - name, strerror(retval)); - return; - } - netdev_close(netdev); - - /* Initialize DHCP client. */ - retval = dhclient_create(name, modify_dhcp_request, - validate_dhcp_offer, (void *) d->s, &d->dhcp); - if (retval) { - VLOG_ERR("Failed to initialize DHCP client, " - "discovery disabled: %s", strerror(retval)); - return; - } - dhclient_set_max_timeout(d->dhcp, 3); - dhclient_init(d->dhcp, 0); - } else { - dhclient_destroy(d->dhcp); - d->dhcp = NULL; - } -} - - -static struct discovery * -discovery_init(const struct settings *s, struct port_watcher *pw, - struct switch_status *ss) -{ - struct discovery *d; - - d = xmalloc(sizeof *d); - d->s = s; - d->dhcp = NULL; - d->n_changes = 0; - - switch_status_register_category(ss, "discovery", discovery_status_cb, d); - port_watcher_register_local_port_callback(pw, discovery_local_port_cb, d); - - return d; -} - -static void -discovery_question_connectivity(struct discovery *d) -{ - if (d->dhcp) { - dhclient_force_renew(d->dhcp, 15); - } -} - -static bool -discovery_run(struct discovery *d, char **controller_name) -{ - if (!d->dhcp) { - *controller_name = NULL; - return true; - } - - dhclient_run(d->dhcp); - if (!dhclient_changed(d->dhcp)) { - return false; - } - - dhclient_configure_netdev(d->dhcp); - if (d->s->update_resolv_conf) { - dhclient_update_resolv_conf(d->dhcp); - } - - if (dhclient_is_bound(d->dhcp)) { - *controller_name = dhcp_msg_get_string(dhclient_get_config(d->dhcp), - DHCP_CODE_OFP_CONTROLLER_VCONN); - VLOG_WARN("%s: discovered controller", *controller_name); - d->n_changes++; - } else { - *controller_name = NULL; - if (d->n_changes) { - VLOG_WARN("discovered controller no longer available"); - d->n_changes++; - } - } - return true; -} - -static void -discovery_wait(struct discovery *d) -{ - if (d->dhcp) { - dhclient_wait(d->dhcp); - } -} - -static void -modify_dhcp_request(struct dhcp_msg *msg, void *aux) -{ - dhcp_msg_put_string(msg, DHCP_CODE_VENDOR_CLASS, "OpenFlow"); -} - -static bool -validate_dhcp_offer(const struct dhcp_msg *msg, void *s_) -{ - const struct settings *s = s_; - char *vconn_name; - bool accept; - - vconn_name = dhcp_msg_get_string(msg, DHCP_CODE_OFP_CONTROLLER_VCONN); - if (!vconn_name) { - VLOG_WARN_RL(&vrl, "rejecting DHCP offer missing controller vconn"); - return false; - } - accept = !regexec(&s->accept_controller_regex, vconn_name, 0, NULL, 0); - if (!accept) { - VLOG_WARN_RL(&vrl, "rejecting controller vconn that fails to match %s", - s->accept_controller_re); - } - free(vconn_name); - return accept; -} - /* User interface. */ static void diff --git a/secchan/secchan.h b/secchan/secchan.h new file mode 100644 index 00000000..0345fa3f --- /dev/null +++ b/secchan/secchan.h @@ -0,0 +1,118 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#ifndef SECCHAN_H +#define SECCHAN_H 1 + +#include +#include +#include +#include "list.h" +#include "packets.h" + +/* Behavior when the connection to the controller fails. */ +enum fail_mode { + FAIL_OPEN, /* Act as learning switch. */ + FAIL_CLOSED /* Drop all packets. */ +}; + +/* Maximum number of management connection listeners. */ +#define MAX_MGMT 8 + +/* Settings that may be configured by the user. */ +struct settings { + /* Overall mode of operation. */ + bool discovery; /* Discover the controller automatically? */ + bool in_band; /* Connect to controller in-band? */ + + /* Related vconns and network devices. */ + const char *dp_name; /* Local datapath. */ + const char *controller_name; /* Controller (if not discovery mode). */ + const char *listener_names[MAX_MGMT]; /* Listen for mgmt connections. */ + size_t n_listeners; /* Number of mgmt connection listeners. */ + const char *monitor_name; /* Listen for traffic monitor connections. */ + + /* Failure behavior. */ + enum fail_mode fail_mode; /* Act as learning switch if no controller? */ + int max_idle; /* Idle time for flows in fail-open mode. */ + int probe_interval; /* # seconds idle before sending echo request. */ + int max_backoff; /* Max # seconds between connection attempts. */ + + /* Packet-in rate-limiting. */ + int rate_limit; /* Tokens added to bucket per second. */ + int burst_limit; /* Maximum number token bucket size. */ + + /* Discovery behavior. */ + regex_t accept_controller_regex; /* Controller vconns to accept. */ + const char *accept_controller_re; /* String version of regex. */ + bool update_resolv_conf; /* Update /etc/resolv.conf? */ + + /* Spanning tree protocol. */ + bool enable_stp; +}; + +struct half { + struct rconn *rconn; + struct ofpbuf *rxbuf; + int n_txq; /* No. of packets queued for tx on 'rconn'. */ +}; + +struct relay { + struct list node; + +#define HALF_LOCAL 0 +#define HALF_REMOTE 1 + struct half halves[2]; + + bool is_mgmt_conn; +}; + +struct hook { + bool (*packet_cb[2])(struct relay *, void *aux); + void (*periodic_cb)(void *aux); + void (*wait_cb)(void *aux); + void *aux; +}; + +struct hook make_hook(bool (*local_packet_cb)(struct relay *, void *), + bool (*remote_packet_cb)(struct relay *, void *), + void (*periodic_cb)(void *), + void (*wait_cb)(void *), + void *aux); +struct ofp_packet_in *get_ofp_packet_in(struct relay *); +bool get_ofp_packet_eth_header(struct relay *, struct ofp_packet_in **, + struct eth_header **); +void get_ofp_packet_payload(struct ofp_packet_in *, struct ofpbuf *); + + +#endif /* secchan.h */ diff --git a/secchan/snat.c b/secchan/snat.c new file mode 100644 index 00000000..1869887e --- /dev/null +++ b/secchan/snat.c @@ -0,0 +1,285 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#include +#include "snat.h" +#include +#include +#include +#include "nicira-ext.h" +#include "ofpbuf.h" +#include "openflow.h" +#include "port-watcher.h" + +#define THIS_MODULE VLM_snat +#include "vlog.h" + +struct snat_port_conf { + struct list node; + struct nx_snat_config config; +}; + +struct snat_data { + struct port_watcher *pw; + struct list port_list; +}; + + +/* Source-NAT configuration monitor. */ +#define SNAT_CMD_LEN 1024 + +/* Commands to configure iptables. There is no programmatic interface + * to iptables from the kernel, so we're stuck making command-line calls + * in user-space. */ +#define SNAT_FLUSH_ALL_CMD "/sbin/iptables -t nat -F" +#define SNAT_FLUSH_CHAIN_CMD "/sbin/iptables -t nat -F of-snat-%s" + +#define SNAT_ADD_CHAIN_CMD "/sbin/iptables -t nat -N of-snat-%s" +#define SNAT_CONF_CHAIN_CMD "/sbin/iptables -t nat -A POSTROUTING -o %s -j of-snat-%s" + +#define SNAT_ADD_IP_CMD "/sbin/iptables -t nat -A of-snat-%s -j SNAT --to %s-%s" +#define SNAT_ADD_TCP_CMD "/sbin/iptables -t nat -A of-snat-%s -j SNAT -p TCP --to %s-%s:%d-%d" +#define SNAT_ADD_UDP_CMD "/sbin/iptables -t nat -A of-snat-%s -j SNAT -p UDP --to %s-%s:%d-%d" + +#define SNAT_UNSET_CHAIN_CMD "/sbin/iptables -t nat -D POSTROUTING -o %s -j of-snat-%s" +#define SNAT_DEL_CHAIN_CMD "/sbin/iptables -t nat -X of-snat-%s" + +static void +snat_add_rules(const struct nx_snat_config *sc, const uint8_t *dev_name) +{ + char command[SNAT_CMD_LEN]; + char ip_str_start[16]; + char ip_str_end[16]; + + + snprintf(ip_str_start, sizeof ip_str_start, IP_FMT, + IP_ARGS(&sc->ip_addr_start)); + snprintf(ip_str_end, sizeof ip_str_end, IP_FMT, + IP_ARGS(&sc->ip_addr_end)); + + /* We always attempt to remove existing entries, so that we know + * there's a pristine state for SNAT on the interface. We just ignore + * the results of these calls, since iptables will complain about + * any non-existent entries. */ + + /* Flush the chain that does the SNAT. */ + snprintf(command, sizeof(command), SNAT_FLUSH_CHAIN_CMD, dev_name); + system(command); + + /* We always try to create the a new chain. */ + snprintf(command, sizeof(command), SNAT_ADD_CHAIN_CMD, dev_name); + system(command); + + /* Disassociate any old SNAT chain from the POSTROUTING chain. */ + snprintf(command, sizeof(command), SNAT_UNSET_CHAIN_CMD, dev_name, + dev_name); + system(command); + + /* Associate the new chain with the POSTROUTING hook. */ + snprintf(command, sizeof(command), SNAT_CONF_CHAIN_CMD, dev_name, + dev_name); + if (system(command) != 0) { + VLOG_ERR("SNAT: problem flushing chain for add"); + return; + } + + /* If configured, restrict TCP source port ranges. */ + if ((sc->tcp_start != 0) && (sc->tcp_end != 0)) { + snprintf(command, sizeof(command), SNAT_ADD_TCP_CMD, + dev_name, ip_str_start, ip_str_end, + ntohs(sc->tcp_start), ntohs(sc->tcp_end)); + if (system(command) != 0) { + VLOG_ERR("SNAT: problem adding TCP rule"); + return; + } + } + + /* If configured, restrict UDP source port ranges. */ + if ((sc->udp_start != 0) && (sc->udp_end != 0)) { + snprintf(command, sizeof(command), SNAT_ADD_UDP_CMD, + dev_name, ip_str_start, ip_str_end, + ntohs(sc->udp_start), ntohs(sc->udp_end)); + if (system(command) != 0) { + VLOG_ERR("SNAT: problem adding UDP rule"); + return; + } + } + + /* Add a rule that covers all IP traffic that would not be covered + * by the prior TCP or UDP ranges. */ + snprintf(command, sizeof(command), SNAT_ADD_IP_CMD, + dev_name, ip_str_start, ip_str_end); + if (system(command) != 0) { + VLOG_ERR("SNAT: problem adding base rule"); + return; + } +} + +static void +snat_del_rules(const uint8_t *dev_name) +{ + char command[SNAT_CMD_LEN]; + + /* Flush the chain that does the SNAT. */ + snprintf(command, sizeof(command), SNAT_FLUSH_CHAIN_CMD, dev_name); + if (system(command) != 0) { + VLOG_ERR("SNAT: problem flushing chain for deletion"); + return; + } + + /* Disassociate the SNAT chain from the POSTROUTING chain. */ + snprintf(command, sizeof(command), SNAT_UNSET_CHAIN_CMD, dev_name, + dev_name); + if (system(command) != 0) { + VLOG_ERR("SNAT: problem unsetting chain"); + return; + } + + /* Now we can finally delete our SNAT chain. */ + snprintf(command, sizeof(command), SNAT_DEL_CHAIN_CMD, dev_name); + if (system(command) != 0) { + VLOG_ERR("SNAT: problem deleting chain"); + return; + } +} + +static void +snat_config(const struct nx_snat_config *sc, struct snat_data *snat) +{ + struct snat_port_conf *c, *spc=NULL; + const uint8_t *netdev_name; + + netdev_name = (const uint8_t *) port_watcher_get_name(snat->pw, + ntohs(sc->port)); + if (!netdev_name) { + return; + } + + LIST_FOR_EACH(c, struct snat_port_conf, node, &snat->port_list) { + if (c->config.port == sc->port) { + spc = c; + break; + } + } + + if (sc->command == NXSC_ADD) { + if (!spc) { + spc = xmalloc(sizeof(*c)); + if (!spc) { + VLOG_ERR("SNAT: no memory for new entry"); + return; + } + list_push_back(&snat->port_list, &spc->node); + } + memcpy(&spc->config, sc, sizeof(spc->config)); + snat_add_rules(sc, netdev_name); + } else if (spc) { + snat_del_rules(netdev_name); + list_remove(&spc->node); + } +} + +static bool +snat_remote_packet_cb(struct relay *r, void *snat_) +{ + struct snat_data *snat = snat_; + struct ofpbuf *msg = r->halves[HALF_REMOTE].rxbuf; + struct nicira_header *request = msg->data; + struct nx_act_config *nac = msg->data; + int n_configs, i; + + + if (msg->size < sizeof(struct nx_act_config)) { + return false; + } + request = msg->data; + if (request->header.type != OFPT_VENDOR + || request->vendor != htonl(NX_VENDOR_ID) + || request->subtype != htonl(NXT_ACT_SET_CONFIG)) { + return false; + } + + /* We're only interested in attempts to configure SNAT */ + if (nac->type != htons(NXAST_SNAT)) { + return false; + } + + n_configs = (msg->size - sizeof *nac) / sizeof *nac->snat; + for (i=0; isnat[i], snat); + } + + return false; +} + +static void +snat_port_changed_cb(uint16_t port_no, + const struct ofp_phy_port *old, + const struct ofp_phy_port *new, + void *snat_) +{ + struct snat_data *snat = snat_; + struct snat_port_conf *c; + + /* We're only interested in ports that went away */ + if (old && !new) { + return; + } + + LIST_FOR_EACH(c, struct snat_port_conf, node, &snat->port_list) { + if (c->config.port == old->port_no) { + snat_del_rules(old->name); + list_remove(&c->node); + return; + } + } +} + +struct hook +snat_hook_create(struct port_watcher *pw) +{ + int ret; + struct snat_data *snat; + + ret = system(SNAT_FLUSH_ALL_CMD); + if (ret != 0) { + VLOG_ERR("SNAT: problem flushing tables"); + } + + snat = xcalloc(1, sizeof *snat); + snat->pw = pw; + list_init(&snat->port_list); + + port_watcher_register_callback(pw, snat_port_changed_cb, snat); + return make_hook(NULL, snat_remote_packet_cb, NULL, NULL, snat); +} diff --git a/secchan/snat.h b/secchan/snat.h new file mode 100644 index 00000000..935b3223 --- /dev/null +++ b/secchan/snat.h @@ -0,0 +1,43 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#ifndef SNAT_H +#define SNAT_H 1 + +#include "secchan.h" + +struct port_watcher; + +struct hook snat_hook_create(struct port_watcher *pw); + +#endif /* snat.h */ diff --git a/secchan/status.c b/secchan/status.c new file mode 100644 index 00000000..99c22aa0 --- /dev/null +++ b/secchan/status.c @@ -0,0 +1,219 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#include +#include "status.h" +#include +#include +#include +#include +#include "dynamic-string.h" +#include "nicira-ext.h" +#include "ofpbuf.h" +#include "openflow.h" +#include "rconn.h" +#include "timeval.h" +#include "vconn.h" + +#define THIS_MODULE VLM_status +#include "vlog.h" + +struct switch_status_category { + char *name; + void (*cb)(struct status_reply *, void *aux); + void *aux; +}; + +struct switch_status { + const struct settings *s; + time_t booted; + struct switch_status_category categories[8]; + int n_categories; +}; + +struct status_reply { + struct switch_status_category *category; + struct ds request; + struct ds output; +}; + +static bool +switch_status_remote_packet_cb(struct relay *r, void *ss_) +{ + struct switch_status *ss = ss_; + struct rconn *rc = r->halves[HALF_REMOTE].rconn; + struct ofpbuf *msg = r->halves[HALF_REMOTE].rxbuf; + struct switch_status_category *c; + struct nicira_header *request; + struct nicira_header *reply; + struct status_reply sr; + struct ofpbuf *b; + int retval; + + if (msg->size < sizeof(struct nicira_header)) { + return false; + } + request = msg->data; + if (request->header.type != OFPT_VENDOR + || request->vendor != htonl(NX_VENDOR_ID) + || request->subtype != htonl(NXT_STATUS_REQUEST)) { + return false; + } + + sr.request.string = (void *) (request + 1); + sr.request.length = msg->size - sizeof *request; + ds_init(&sr.output); + for (c = ss->categories; c < &ss->categories[ss->n_categories]; c++) { + if (!memcmp(c->name, sr.request.string, + MIN(strlen(c->name), sr.request.length))) { + sr.category = c; + c->cb(&sr, c->aux); + } + } + reply = make_openflow_xid(sizeof *reply + sr.output.length, + OFPT_VENDOR, request->header.xid, &b); + reply->vendor = htonl(NX_VENDOR_ID); + reply->subtype = htonl(NXT_STATUS_REPLY); + memcpy(reply + 1, sr.output.string, sr.output.length); + retval = rconn_send(rc, b, NULL); + if (retval && retval != EAGAIN) { + VLOG_WARN("send failed (%s)", strerror(retval)); + } + ds_destroy(&sr.output); + return true; +} + +void +rconn_status_cb(struct status_reply *sr, void *rconn_) +{ + struct rconn *rconn = rconn_; + time_t now = time_now(); + + status_reply_put(sr, "name=%s", rconn_get_name(rconn)); + status_reply_put(sr, "state=%s", rconn_get_state(rconn)); + status_reply_put(sr, "backoff=%d", rconn_get_backoff(rconn)); + status_reply_put(sr, "is-connected=%s", + rconn_is_connected(rconn) ? "true" : "false"); + status_reply_put(sr, "sent-msgs=%u", rconn_packets_sent(rconn)); + status_reply_put(sr, "received-msgs=%u", rconn_packets_received(rconn)); + status_reply_put(sr, "attempted-connections=%u", + rconn_get_attempted_connections(rconn)); + status_reply_put(sr, "successful-connections=%u", + rconn_get_successful_connections(rconn)); + status_reply_put(sr, "last-connection=%ld", + (long int) (now - rconn_get_last_connection(rconn))); + status_reply_put(sr, "time-connected=%lu", + rconn_get_total_time_connected(rconn)); + status_reply_put(sr, "state-elapsed=%u", rconn_get_state_elapsed(rconn)); +} + +static void +config_status_cb(struct status_reply *sr, void *s_) +{ + const struct settings *s = s_; + size_t i; + + for (i = 0; i < s->n_listeners; i++) { + status_reply_put(sr, "management%zu=%s", i, s->listener_names[i]); + } + if (s->probe_interval) { + status_reply_put(sr, "probe-interval=%d", s->probe_interval); + } + if (s->max_backoff) { + status_reply_put(sr, "max-backoff=%d", s->max_backoff); + } +} + +static void +switch_status_cb(struct status_reply *sr, void *ss_) +{ + struct switch_status *ss = ss_; + time_t now = time_now(); + + status_reply_put(sr, "now=%ld", (long int) now); + status_reply_put(sr, "uptime=%ld", (long int) (now - ss->booted)); + status_reply_put(sr, "pid=%ld", (long int) getpid()); +} + +struct hook +switch_status_hook_create(const struct settings *s, struct switch_status **ssp) +{ + struct switch_status *ss = xcalloc(1, sizeof *ss); + ss->s = s; + ss->booted = time_now(); + switch_status_register_category(ss, "config", + config_status_cb, (void *) s); + switch_status_register_category(ss, "switch", switch_status_cb, ss); + *ssp = ss; + return make_hook(NULL, switch_status_remote_packet_cb, NULL, NULL, ss); +} + +void +switch_status_register_category(struct switch_status *ss, + const char *category, + void (*cb)(struct status_reply *, + void *aux), + void *aux) +{ + struct switch_status_category *c; + assert(ss->n_categories < ARRAY_SIZE(ss->categories)); + c = &ss->categories[ss->n_categories++]; + c->cb = cb; + c->aux = aux; + c->name = xstrdup(category); +} + +void +status_reply_put(struct status_reply *sr, const char *content, ...) +{ + size_t old_length = sr->output.length; + size_t added; + va_list args; + + /* Append the status reply to the output. */ + ds_put_format(&sr->output, "%s.", sr->category->name); + va_start(args, content); + ds_put_format_valist(&sr->output, content, args); + va_end(args); + if (ds_last(&sr->output) != '\n') { + ds_put_char(&sr->output, '\n'); + } + + /* Drop what we just added if it doesn't match the request. */ + added = sr->output.length - old_length; + if (added < sr->request.length + || memcmp(&sr->output.string[old_length], + sr->request.string, sr->request.length)) { + ds_truncate(&sr->output, old_length); + } +} diff --git a/secchan/status.h b/secchan/status.h new file mode 100644 index 00000000..14bffa67 --- /dev/null +++ b/secchan/status.h @@ -0,0 +1,55 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#ifndef STATUS_H +#define STATUS_H 1 + +#include "secchan.h" + +struct switch_status; +struct status_reply; + +struct hook switch_status_hook_create(const struct settings *, + struct switch_status **); +void switch_status_register_category(struct switch_status *, + const char *category, + void (*cb)(struct status_reply *, + void *aux), + void *aux); + +void status_reply_put(struct status_reply *, const char *, ...) + PRINTF_FORMAT(2, 3); + +void rconn_status_cb(struct status_reply *, void *rconn_); + +#endif /* status.h */ diff --git a/secchan/stp-secchan.c b/secchan/stp-secchan.c new file mode 100644 index 00000000..de3e1b78 --- /dev/null +++ b/secchan/stp-secchan.c @@ -0,0 +1,309 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#include +#include "stp-secchan.h" +#include +#include +#include "flow.h" +#include "secchan.h" +#include "ofpbuf.h" +#include "openflow.h" +#include "poll-loop.h" +#include "port-watcher.h" +#include "rconn.h" +#include "stp.h" +#include "timeval.h" +#include "vconn.h" + +#define THIS_MODULE VLM_stp_secchan +#include "vlog.h" + +struct stp_data { + struct stp *stp; + struct port_watcher *pw; + struct rconn *local_rconn; + struct rconn *remote_rconn; + long long int last_tick_256ths; + int n_txq; +}; + +static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(60, 60); + +static bool +stp_local_packet_cb(struct relay *r, void *stp_) +{ + struct ofpbuf *msg = r->halves[HALF_LOCAL].rxbuf; + struct ofp_header *oh; + struct stp_data *stp = stp_; + struct ofp_packet_in *opi; + struct eth_header *eth; + struct llc_header *llc; + struct ofpbuf payload; + uint16_t port_no; + struct flow flow; + + oh = msg->data; + if (oh->type == OFPT_FEATURES_REPLY + && msg->size >= offsetof(struct ofp_switch_features, ports)) { + struct ofp_switch_features *osf = msg->data; + osf->capabilities |= htonl(OFPC_STP); + return false; + } + + if (!get_ofp_packet_eth_header(r, &opi, ð) + || !eth_addr_equals(eth->eth_dst, stp_eth_addr)) { + return false; + } + + port_no = ntohs(opi->in_port); + if (port_no >= STP_MAX_PORTS) { + /* STP only supports 255 ports. */ + return false; + } + if (port_watcher_get_config(stp->pw, port_no) & OFPPC_NO_STP) { + /* We're not doing STP on this port. */ + return false; + } + + if (opi->reason == OFPR_ACTION) { + /* The controller set up a flow for this, so we won't intercept it. */ + return false; + } + + get_ofp_packet_payload(opi, &payload); + flow_extract(&payload, port_no, &flow); + if (flow.dl_type != htons(OFP_DL_TYPE_NOT_ETH_TYPE)) { + VLOG_DBG("non-LLC frame received on STP multicast address"); + return false; + } + llc = ofpbuf_at_assert(&payload, sizeof *eth, sizeof *llc); + if (llc->llc_dsap != STP_LLC_DSAP) { + VLOG_DBG("bad DSAP 0x%02"PRIx8" received on STP multicast address", + llc->llc_dsap); + return false; + } + + /* Trim off padding on payload. */ + if (payload.size > ntohs(eth->eth_type) + ETH_HEADER_LEN) { + payload.size = ntohs(eth->eth_type) + ETH_HEADER_LEN; + } + if (ofpbuf_try_pull(&payload, ETH_HEADER_LEN + LLC_HEADER_LEN)) { + struct stp_port *p = stp_get_port(stp->stp, port_no); + stp_received_bpdu(p, payload.data, payload.size); + } + + return true; +} + +static long long int +time_256ths(void) +{ + return time_msec() * 256 / 1000; +} + +static void +stp_periodic_cb(void *stp_) +{ + struct stp_data *stp = stp_; + long long int now_256ths = time_256ths(); + long long int elapsed_256ths = now_256ths - stp->last_tick_256ths; + struct stp_port *p; + + if (!port_watcher_is_ready(stp->pw)) { + /* Can't start STP until we know port flags, because port flags can + * disable STP. */ + return; + } + if (elapsed_256ths <= 0) { + return; + } + + stp_tick(stp->stp, MIN(INT_MAX, elapsed_256ths)); + stp->last_tick_256ths = now_256ths; + + while (stp_get_changed_port(stp->stp, &p)) { + int port_no = stp_port_no(p); + enum stp_state s_state = stp_port_get_state(p); + + if (s_state != STP_DISABLED) { + VLOG_WARN("STP: Port %d entered %s state", + port_no, stp_state_name(s_state)); + } + if (!(port_watcher_get_config(stp->pw, port_no) & OFPPC_NO_STP)) { + uint32_t p_config = 0; + uint32_t p_state; + switch (s_state) { + case STP_LISTENING: + p_state = OFPPS_STP_LISTEN; + break; + case STP_LEARNING: + p_state = OFPPS_STP_LEARN; + break; + case STP_DISABLED: + case STP_FORWARDING: + p_state = OFPPS_STP_FORWARD; + break; + case STP_BLOCKING: + p_state = OFPPS_STP_BLOCK; + break; + default: + VLOG_DBG_RL(&rl, "STP: Port %d has bad state %x", + port_no, s_state); + p_state = OFPPS_STP_FORWARD; + break; + } + if (!stp_forward_in_state(s_state)) { + p_config = OFPPC_NO_FLOOD; + } + port_watcher_set_flags(stp->pw, port_no, + p_config, OFPPC_NO_FLOOD, + p_state, OFPPS_STP_MASK); + } else { + /* We don't own those flags. */ + } + } +} + +static void +stp_wait_cb(void *stp_ UNUSED) +{ + poll_timer_wait(1000); +} + +static void +send_bpdu(const void *bpdu, size_t bpdu_size, int port_no, void *stp_) +{ + struct stp_data *stp = stp_; + const uint8_t *port_mac; + struct eth_header *eth; + struct llc_header *llc; + struct ofpbuf pkt, *opo; + + port_mac = port_watcher_get_hwaddr(stp->pw, port_no); + if (!port_mac) { + VLOG_WARN_RL(&rl, "cannot send BPDU on missing port %d", port_no); + return; + } + + /* Packet skeleton. */ + ofpbuf_init(&pkt, ETH_HEADER_LEN + LLC_HEADER_LEN + bpdu_size); + eth = ofpbuf_put_uninit(&pkt, sizeof *eth); + llc = ofpbuf_put_uninit(&pkt, sizeof *llc); + ofpbuf_put(&pkt, bpdu, bpdu_size); + + /* 802.2 header. */ + memcpy(eth->eth_dst, stp_eth_addr, ETH_ADDR_LEN); + memcpy(eth->eth_src, port_mac, ETH_ADDR_LEN); + eth->eth_type = htons(pkt.size - ETH_HEADER_LEN); + + /* LLC header. */ + llc->llc_dsap = STP_LLC_DSAP; + llc->llc_ssap = STP_LLC_SSAP; + llc->llc_cntl = STP_LLC_CNTL; + + opo = make_unbuffered_packet_out(&pkt, OFPP_NONE, port_no); + ofpbuf_uninit(&pkt); + rconn_send_with_limit(stp->local_rconn, opo, &stp->n_txq, OFPP_MAX); +} + +static bool +stp_is_port_supported(uint16_t port_no) +{ + return port_no < STP_MAX_PORTS; +} + +static void +stp_port_changed_cb(uint16_t port_no, + const struct ofp_phy_port *old, + const struct ofp_phy_port *new, + void *stp_) +{ + struct stp_data *stp = stp_; + struct stp_port *p; + + if (!stp_is_port_supported(port_no)) { + return; + } + + p = stp_get_port(stp->stp, port_no); + if (!new + || new->config & htonl(OFPPC_NO_STP | OFPPC_PORT_DOWN) + || new->state & htonl(OFPPS_LINK_DOWN)) { + stp_port_disable(p); + } else { + int speed = 0; + stp_port_enable(p); + if (new->curr & (OFPPF_10MB_HD | OFPPF_10MB_FD)) { + speed = 10; + } else if (new->curr & (OFPPF_100MB_HD | OFPPF_100MB_FD)) { + speed = 100; + } else if (new->curr & (OFPPF_1GB_HD | OFPPF_1GB_FD)) { + speed = 1000; + } else if (new->curr & OFPPF_100MB_FD) { + speed = 10000; + } + stp_port_set_speed(p, speed); + } +} + +static void +stp_local_port_changed_cb(const struct ofp_phy_port *port, void *stp_) +{ + struct stp_data *stp = stp_; + if (port) { + stp_set_bridge_id(stp->stp, eth_addr_to_uint64(port->hw_addr)); + } +} + +struct hook +stp_hook_create(const struct settings *s, struct port_watcher *pw, + struct rconn *local, struct rconn *remote) +{ + uint8_t dpid[ETH_ADDR_LEN]; + struct stp_data *stp; + + stp = xcalloc(1, sizeof *stp); + eth_addr_random(dpid); + stp->stp = stp_create("stp", eth_addr_to_uint64(dpid), send_bpdu, stp); + stp->pw = pw; + stp->local_rconn = local; + stp->remote_rconn = remote; + stp->last_tick_256ths = time_256ths(); + + port_watcher_register_callback(pw, stp_port_changed_cb, stp); + port_watcher_register_local_port_callback(pw, stp_local_port_changed_cb, + stp); + return make_hook(stp_local_packet_cb, NULL, + stp_periodic_cb, stp_wait_cb, stp); +} diff --git a/secchan/stp-secchan.h b/secchan/stp-secchan.h new file mode 100644 index 00000000..98a7a4dd --- /dev/null +++ b/secchan/stp-secchan.h @@ -0,0 +1,48 @@ +/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford + * Junior University + * + * We are making the OpenFlow specification and associated documentation + * (Software) available for public use and benefit with the expectation + * that others will use, modify and enhance the Software and contribute + * those enhancements back to the community. However, since we would + * like to make the Software available for broadest use, with as few + * restrictions as possible permission is hereby granted, free of + * charge, to any person obtaining a copy of this Software to deal in + * the Software under the copyrights without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * The name and trademarks of copyright holder(s) may NOT be used in + * advertising or publicity pertaining to the Software or any + * derivatives without specific, written prior permission. + */ + +#ifndef STP_SECCHAN_H +#define STP_SECCHAN_H 1 + +/* Extra time, in seconds, at boot before going into fail-open, to give the + * spanning tree protocol time to figure out the network layout. */ +#define STP_EXTRA_BOOT_TIME 30 + +struct port_watcher; +struct rconn; +struct settings; + +struct hook stp_hook_create(const struct settings *s, struct port_watcher *pw, + struct rconn *local, struct rconn *remote); + +#endif /* stp-secchan.h */