X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Froute-table.c;h=8212c5466e6dfa145abab275593247027aa2d4c1;hb=42bb6c72b58ba99e59e740f8cca4e201d7efaa02;hp=83a666ef3636ca7c0c15e02c175e0725b7c1bced;hpb=cceb11f5b12d09cc8afc87ca4fd03e941234d439;p=openvswitch diff --git a/lib/route-table.c b/lib/route-table.c index 83a666ef..8212c546 100644 --- a/lib/route-table.c +++ b/lib/route-table.c @@ -30,6 +30,7 @@ #include "netlink-socket.h" #include "ofpbuf.h" #include "rtnetlink.h" +#include "rtnetlink-link.h" #include "vlog.h" VLOG_DEFINE_THIS_MODULE(route_table); @@ -56,15 +57,25 @@ struct route_node { struct route_data rd; /* Data associated with this node. */ }; +struct name_node { + struct hmap_node node; /* Node in name_map. */ + uint32_t ifi_index; /* Kernel interface index. */ + + char ifname[IFNAMSIZ]; /* Interface name. */ +}; + static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); static unsigned int register_count = 0; static struct rtnetlink *rtn = NULL; static struct route_table_msg rtmsg; -static struct rtnetlink_notifier notifier; +static struct rtnetlink_notifier route_notifier; +static struct rtnetlink_notifier name_notifier; static bool route_table_valid = false; +static bool name_table_valid = false; static struct hmap route_map; +static struct hmap name_map; static int route_table_reset(void); static void route_table_handle_msg(const struct route_table_msg *); @@ -75,6 +86,39 @@ static struct route_node *route_node_lookup_by_ip(uint32_t ip); static void route_map_clear(void); static uint32_t hash_route_data(const struct route_data *); +static void name_table_init(void); +static void name_table_uninit(void); +static int name_table_reset(void); +static void name_table_change(const struct rtnetlink_link_change *, void *); +static void name_map_clear(void); +static struct name_node *name_node_lookup(int ifi_index); + +/* Populates 'name' with the name of the interface traffic destined for 'ip' + * is likely to egress out of (see route_table_get_ifindex). + * + * Returns true if successful, otherwise false. */ +bool +route_table_get_name(ovs_be32 ip, char name[IFNAMSIZ]) +{ + int ifindex; + + if (!name_table_valid) { + name_table_reset(); + } + + if (route_table_get_ifindex(ip, &ifindex)) { + struct name_node *nn; + + nn = name_node_lookup(ifindex); + if (nn) { + ovs_strlcpy(name, nn->ifname, IFNAMSIZ); + return true; + } + } + + return false; +} + /* Populates 'ifindex' with the interface index traffic destined for 'ip' is * likely to egress. There is no hard guarantee that traffic destined for 'ip' * will egress out the specified interface. 'ifindex' may refer to an @@ -126,10 +170,11 @@ route_table_register(void) nf = (rtnetlink_notify_func *) route_table_change; rtn = rtnetlink_create(RTNLGRP_IPV4_ROUTE, pf, &rtmsg); - rtnetlink_notifier_register(rtn, ¬ifier, nf, NULL); + rtnetlink_notifier_register(rtn, &route_notifier, nf, NULL); hmap_init(&route_map); route_table_reset(); + name_table_init(); } register_count++; @@ -149,6 +194,7 @@ route_table_unregister(void) route_map_clear(); hmap_destroy(&route_map); + name_table_uninit(); } } @@ -157,6 +203,7 @@ void route_table_run(void) { if (rtn) { + rtnetlink_link_notifier_run(); rtnetlink_notifier_run(rtn); } } @@ -166,6 +213,7 @@ void route_table_wait(void) { if (rtn) { + rtnetlink_link_notifier_wait(); rtnetlink_notifier_wait(rtn); } } @@ -345,3 +393,97 @@ hash_route_data(const struct route_data *rd) { return hash_bytes(rd, sizeof *rd, 0); } + +/* name_table . */ + +static void +name_table_init(void) +{ + hmap_init(&name_map); + rtnetlink_link_notifier_register(&name_notifier, name_table_change, NULL); + name_table_valid = false; +} + +static void +name_table_uninit(void) +{ + rtnetlink_link_notifier_unregister(&name_notifier); + name_map_clear(); + hmap_destroy(&name_map); +} + +static int +name_table_reset(void) +{ + int error; + struct nl_dump dump; + struct rtgenmsg *rtmsg; + struct ofpbuf request, reply; + static struct nl_sock *rtnl_sock; + + name_table_valid = true; + name_map_clear(); + error = nl_sock_create(NETLINK_ROUTE, &rtnl_sock); + if (error) { + VLOG_WARN_RL(&rl, "failed to create NETLINK_ROUTE socket"); + return error; + } + + ofpbuf_init(&request, 0); + nl_msg_put_nlmsghdr(&request, sizeof *rtmsg, RTM_GETLINK, NLM_F_REQUEST); + rtmsg = ofpbuf_put_zeros(&request, sizeof *rtmsg); + rtmsg->rtgen_family = AF_INET; + + nl_dump_start(&dump, rtnl_sock, &request); + while (nl_dump_next(&dump, &reply)) { + struct rtnetlink_link_change change; + + if (rtnetlink_link_parse(&reply, &change) + && change.nlmsg_type == RTM_NEWLINK + && !name_node_lookup(change.ifi_index)) { + struct name_node *nn; + + nn = xzalloc(sizeof *nn); + nn->ifi_index = change.ifi_index; + ovs_strlcpy(nn->ifname, change.ifname, IFNAMSIZ); + hmap_insert(&name_map, &nn->node, hash_int(nn->ifi_index, 0)); + } + } + nl_sock_destroy(rtnl_sock); + return nl_dump_done(&dump); +} + +static void +name_table_change(const struct rtnetlink_link_change *change OVS_UNUSED, + void *aux OVS_UNUSED) +{ + /* Changes to interface status can cause routing table changes that some + * versions of the linux kernel do not advertise for some reason. */ + route_table_valid = false; + name_table_valid = false; +} + +static struct name_node * +name_node_lookup(int ifi_index) +{ + struct name_node *nn; + + HMAP_FOR_EACH_WITH_HASH(nn, node, hash_int(ifi_index, 0), &name_map) { + if (nn->ifi_index == ifi_index) { + return nn; + } + } + + return NULL; +} + +static void +name_map_clear(void) +{ + struct name_node *nn, *nn_next; + + HMAP_FOR_EACH_SAFE(nn, nn_next, node, &name_map) { + hmap_remove(&name_map, &nn->node); + free(nn); + } +}