2 * Copyright (c) 2007, 2008, 2009, 2010, 2011 Nicira Networks.
3 * Distributed under the terms of the GNU GPL version 2.
5 * Significant portions of this file may be copied from parts of the Linux
6 * kernel, by Linus Torvalds and others.
9 /* Functions for managing the dp interface/device. */
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/if_arp.h>
16 #include <linux/if_vlan.h>
19 #include <linux/jhash.h>
20 #include <linux/delay.h>
21 #include <linux/time.h>
22 #include <linux/etherdevice.h>
23 #include <linux/genetlink.h>
24 #include <linux/kernel.h>
25 #include <linux/kthread.h>
26 #include <linux/mutex.h>
27 #include <linux/percpu.h>
28 #include <linux/rcupdate.h>
29 #include <linux/tcp.h>
30 #include <linux/udp.h>
31 #include <linux/version.h>
32 #include <linux/ethtool.h>
33 #include <linux/wait.h>
34 #include <asm/system.h>
35 #include <asm/div64.h>
37 #include <linux/highmem.h>
38 #include <linux/netfilter_bridge.h>
39 #include <linux/netfilter_ipv4.h>
40 #include <linux/inetdevice.h>
41 #include <linux/list.h>
42 #include <linux/rculist.h>
43 #include <linux/dmi.h>
44 #include <net/inet_ecn.h>
45 #include <net/genetlink.h>
47 #include "openvswitch/datapath-protocol.h"
54 #include "vport-internal_dev.h"
56 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) || \
57 LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
58 #error Kernels before 2.6.18 or after 3.0 are not supported by this version of Open vSwitch.
61 int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
62 EXPORT_SYMBOL(dp_ioctl_hook);
67 * Writes to device state (add/remove datapath, port, set operations on vports,
68 * etc.) are protected by RTNL.
70 * Writes to other state (flow table modifications, set miscellaneous datapath
71 * parameters such as drop frags, etc.) are protected by genl_mutex. The RTNL
72 * lock nests inside genl_mutex.
74 * Reads are protected by RCU.
76 * There are a few special cases (mostly stats) that have their own
77 * synchronization but they nest under all of above and don't interact with
81 /* Global list of datapaths to enable dumping them all out.
82 * Protected by genl_mutex.
84 static LIST_HEAD(dps);
86 static struct vport *new_vport(const struct vport_parms *);
87 static int queue_userspace_packets(struct datapath *, u32 pid, struct sk_buff *,
88 const struct dp_upcall_info *);
90 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
91 struct datapath *get_dp(int dp_ifindex)
93 struct datapath *dp = NULL;
94 struct net_device *dev;
97 dev = dev_get_by_index_rcu(&init_net, dp_ifindex);
99 struct vport *vport = internal_dev_get_vport(dev);
107 EXPORT_SYMBOL_GPL(get_dp);
109 /* Must be called with genl_mutex. */
110 static struct flow_table *get_table_protected(struct datapath *dp)
112 return rcu_dereference_protected(dp->table, lockdep_genl_is_held());
115 /* Must be called with rcu_read_lock or RTNL lock. */
116 static struct vport *get_vport_protected(struct datapath *dp, u16 port_no)
118 return rcu_dereference_rtnl(dp->ports[port_no]);
121 /* Must be called with rcu_read_lock or RTNL lock. */
122 const char *dp_name(const struct datapath *dp)
124 return vport_get_name(rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]));
127 static int get_dpifindex(struct datapath *dp)
134 local = get_vport_protected(dp, OVSP_LOCAL);
136 ifindex = vport_get_ifindex(local);
145 static inline size_t br_nlmsg_size(void)
147 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
148 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
149 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
150 + nla_total_size(4) /* IFLA_MASTER */
151 + nla_total_size(4) /* IFLA_MTU */
152 + nla_total_size(1); /* IFLA_OPERSTATE */
155 /* Caller must hold RTNL lock. */
156 static int dp_fill_ifinfo(struct sk_buff *skb,
157 const struct vport *port,
158 int event, unsigned int flags)
160 struct datapath *dp = port->dp;
161 int ifindex = vport_get_ifindex(port);
162 struct ifinfomsg *hdr;
163 struct nlmsghdr *nlh;
168 nlh = nlmsg_put(skb, 0, 0, event, sizeof(*hdr), flags);
172 hdr = nlmsg_data(nlh);
173 hdr->ifi_family = AF_BRIDGE;
175 hdr->ifi_type = ARPHRD_ETHER;
176 hdr->ifi_index = ifindex;
177 hdr->ifi_flags = vport_get_flags(port);
180 NLA_PUT_STRING(skb, IFLA_IFNAME, vport_get_name(port));
181 NLA_PUT_U32(skb, IFLA_MASTER, get_dpifindex(dp));
182 NLA_PUT_U32(skb, IFLA_MTU, vport_get_mtu(port));
183 #ifdef IFLA_OPERSTATE
184 NLA_PUT_U8(skb, IFLA_OPERSTATE,
185 vport_is_running(port)
186 ? vport_get_operstate(port)
190 NLA_PUT(skb, IFLA_ADDRESS, ETH_ALEN, vport_get_addr(port));
192 return nlmsg_end(skb, nlh);
195 nlmsg_cancel(skb, nlh);
199 /* Caller must hold RTNL lock. */
200 static void dp_ifinfo_notify(int event, struct vport *port)
205 skb = nlmsg_new(br_nlmsg_size(), GFP_KERNEL);
209 err = dp_fill_ifinfo(skb, port, event, 0);
211 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
212 WARN_ON(err == -EMSGSIZE);
216 rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
220 rtnl_set_sk_err(&init_net, RTNLGRP_LINK, err);
223 static void release_dp(struct kobject *kobj)
225 struct datapath *dp = container_of(kobj, struct datapath, ifobj);
229 static struct kobj_type dp_ktype = {
230 .release = release_dp
233 static void destroy_dp_rcu(struct rcu_head *rcu)
235 struct datapath *dp = container_of(rcu, struct datapath, rcu);
237 flow_tbl_destroy(dp->table);
238 free_percpu(dp->stats_percpu);
239 kobject_put(&dp->ifobj);
242 /* Called with RTNL lock and genl_lock. */
243 static struct vport *new_vport(const struct vport_parms *parms)
247 vport = vport_add(parms);
248 if (!IS_ERR(vport)) {
249 struct datapath *dp = parms->dp;
251 rcu_assign_pointer(dp->ports[parms->port_no], vport);
252 list_add(&vport->node, &dp->port_list);
254 dp_ifinfo_notify(RTM_NEWLINK, vport);
260 /* Called with RTNL lock. */
261 void dp_detach_port(struct vport *p)
265 if (p->port_no != OVSP_LOCAL)
267 dp_ifinfo_notify(RTM_DELLINK, p);
269 /* First drop references to device. */
271 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
273 /* Then destroy it. */
277 /* Must be called with rcu_read_lock. */
278 void dp_process_received_packet(struct vport *p, struct sk_buff *skb)
280 struct datapath *dp = p->dp;
281 struct sw_flow *flow;
282 struct dp_stats_percpu *stats;
286 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
287 OVS_CB(skb)->vport = p;
289 if (!OVS_CB(skb)->flow) {
290 struct sw_flow_key key;
294 /* Extract flow from 'skb' into 'key'. */
295 error = flow_extract(skb, p->port_no, &key, &key_len, &is_frag);
296 if (unlikely(error)) {
301 if (is_frag && dp->drop_frags) {
303 stats_counter = &stats->n_frags;
308 flow = flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
309 if (unlikely(!flow)) {
310 struct dp_upcall_info upcall;
312 upcall.cmd = OVS_PACKET_CMD_MISS;
314 dp_upcall(dp, skb, &upcall);
316 stats_counter = &stats->n_missed;
320 OVS_CB(skb)->flow = flow;
323 stats_counter = &stats->n_hit;
324 flow_used(OVS_CB(skb)->flow, skb);
325 execute_actions(dp, skb);
328 /* Update datapath statistics. */
330 write_seqcount_begin(&stats->seqlock);
332 write_seqcount_end(&stats->seqlock);
335 static void copy_and_csum_skb(struct sk_buff *skb, void *to)
337 u16 csum_start, csum_offset;
340 get_skb_csum_pointers(skb, &csum_start, &csum_offset);
341 csum_start -= skb_headroom(skb);
343 skb_copy_bits(skb, 0, to, csum_start);
345 csum = skb_copy_and_csum_bits(skb, csum_start, to + csum_start,
346 skb->len - csum_start, 0);
347 *(__sum16 *)(to + csum_start + csum_offset) = csum_fold(csum);
350 static struct genl_family dp_packet_genl_family = {
351 .id = GENL_ID_GENERATE,
352 .hdrsize = sizeof(struct ovs_header),
353 .name = OVS_PACKET_FAMILY,
355 .maxattr = OVS_PACKET_ATTR_MAX
358 int dp_upcall(struct datapath *dp, struct sk_buff *skb,
359 const struct dp_upcall_info *upcall_info)
361 struct sk_buff *segs = NULL;
362 struct dp_stats_percpu *stats;
366 if (OVS_CB(skb)->flow)
367 pid = OVS_CB(skb)->flow->upcall_pid;
369 pid = OVS_CB(skb)->vport->upcall_pid;
376 forward_ip_summed(skb, true);
378 /* Break apart GSO packets into their component pieces. Otherwise
379 * userspace may try to stuff a 64kB packet into a 1500-byte MTU. */
380 if (skb_is_gso(skb)) {
381 segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
390 err = queue_userspace_packets(dp, pid, skb, upcall_info);
392 struct sk_buff *next;
393 /* Free GSO-segments */
397 } while ((segs = next) != NULL);
406 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
408 write_seqcount_begin(&stats->seqlock);
410 write_seqcount_end(&stats->seqlock);
415 /* Send each packet in the 'skb' list to userspace for 'dp' as directed by
416 * 'upcall_info'. There will be only one packet unless we broke up a GSO
419 static int queue_userspace_packets(struct datapath *dp, u32 pid,
421 const struct dp_upcall_info *upcall_info)
425 dp_ifindex = get_dpifindex(dp);
430 struct ovs_header *upcall;
431 struct sk_buff *user_skb; /* to be queued to userspace */
436 err = vlan_deaccel_tag(skb);
440 if (nla_attr_size(skb->len) > USHRT_MAX)
443 len = sizeof(struct ovs_header);
444 len += nla_total_size(skb->len);
445 len += nla_total_size(FLOW_BUFSIZE);
446 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
447 len += nla_total_size(8);
449 user_skb = genlmsg_new(len, GFP_ATOMIC);
453 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
454 0, upcall_info->cmd);
455 upcall->dp_ifindex = dp_ifindex;
457 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
458 flow_to_nlattrs(upcall_info->key, user_skb);
459 nla_nest_end(user_skb, nla);
461 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
462 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
463 upcall_info->userdata);
465 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
466 if (skb->ip_summed == CHECKSUM_PARTIAL)
467 copy_and_csum_skb(skb, nla_data(nla));
469 skb_copy_bits(skb, 0, nla_data(nla), skb->len);
471 err = genlmsg_unicast(&init_net, user_skb, pid);
475 } while ((skb = skb->next));
480 /* Called with genl_mutex. */
481 static int flush_flows(int dp_ifindex)
483 struct flow_table *old_table;
484 struct flow_table *new_table;
487 dp = get_dp(dp_ifindex);
491 old_table = get_table_protected(dp);
492 new_table = flow_tbl_alloc(TBL_MIN_BUCKETS);
496 rcu_assign_pointer(dp->table, new_table);
498 flow_tbl_deferred_destroy(old_table);
502 static int validate_actions(const struct nlattr *attr, int depth);
504 static int validate_sample(const struct nlattr *attr, int depth)
506 static const struct nla_policy sample_policy[OVS_SAMPLE_ATTR_MAX + 1] =
508 [OVS_SAMPLE_ATTR_PROBABILITY] = {.type = NLA_U32 },
509 [OVS_SAMPLE_ATTR_ACTIONS] = {.type = NLA_UNSPEC },
511 struct nlattr *a[OVS_SAMPLE_ATTR_MAX + 1];
514 error = nla_parse_nested(a, OVS_SAMPLE_ATTR_MAX, attr, sample_policy);
518 if (!a[OVS_SAMPLE_ATTR_PROBABILITY])
520 if (!a[OVS_SAMPLE_ATTR_ACTIONS])
523 return validate_actions(a[OVS_SAMPLE_ATTR_ACTIONS], (depth + 1));
526 static int validate_actions(const struct nlattr *attr, int depth)
528 const struct nlattr *a;
531 if (depth >= SAMPLE_ACTION_DEPTH)
534 nla_for_each_nested(a, attr, rem) {
535 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
536 [OVS_ACTION_ATTR_OUTPUT] = 4,
537 [OVS_ACTION_ATTR_USERSPACE] = 8,
538 [OVS_ACTION_ATTR_PUSH_VLAN] = 2,
539 [OVS_ACTION_ATTR_POP_VLAN] = 0,
540 [OVS_ACTION_ATTR_SET_DL_SRC] = ETH_ALEN,
541 [OVS_ACTION_ATTR_SET_DL_DST] = ETH_ALEN,
542 [OVS_ACTION_ATTR_SET_NW_SRC] = 4,
543 [OVS_ACTION_ATTR_SET_NW_DST] = 4,
544 [OVS_ACTION_ATTR_SET_NW_TOS] = 1,
545 [OVS_ACTION_ATTR_SET_TP_SRC] = 2,
546 [OVS_ACTION_ATTR_SET_TP_DST] = 2,
547 [OVS_ACTION_ATTR_SET_TUNNEL] = 8,
548 [OVS_ACTION_ATTR_SET_PRIORITY] = 4,
549 [OVS_ACTION_ATTR_POP_PRIORITY] = 0,
551 int type = nla_type(a);
553 /* Match expected attr len for given attr len except for
554 * OVS_ACTION_ATTR_SAMPLE, as it has nested actions list which
555 * is variable size. */
556 if (type > OVS_ACTION_ATTR_MAX ||
557 (nla_len(a) != action_lens[type] &&
558 type != OVS_ACTION_ATTR_SAMPLE))
562 case OVS_ACTION_ATTR_UNSPEC:
565 case OVS_ACTION_ATTR_USERSPACE:
566 case OVS_ACTION_ATTR_POP_VLAN:
567 case OVS_ACTION_ATTR_SET_DL_SRC:
568 case OVS_ACTION_ATTR_SET_DL_DST:
569 case OVS_ACTION_ATTR_SET_NW_SRC:
570 case OVS_ACTION_ATTR_SET_NW_DST:
571 case OVS_ACTION_ATTR_SET_TP_SRC:
572 case OVS_ACTION_ATTR_SET_TP_DST:
573 case OVS_ACTION_ATTR_SET_TUNNEL:
574 case OVS_ACTION_ATTR_SET_PRIORITY:
575 case OVS_ACTION_ATTR_POP_PRIORITY:
576 /* No validation needed. */
579 case OVS_ACTION_ATTR_OUTPUT:
580 if (nla_get_u32(a) >= DP_MAX_PORTS)
584 case OVS_ACTION_ATTR_PUSH_VLAN:
585 if (nla_get_be16(a) & htons(VLAN_CFI_MASK))
589 case OVS_ACTION_ATTR_SET_NW_TOS:
590 if (nla_get_u8(a) & INET_ECN_MASK)
594 case OVS_ACTION_ATTR_SAMPLE:
595 err = validate_sample(a, depth);
610 static void clear_stats(struct sw_flow *flow)
614 flow->packet_count = 0;
615 flow->byte_count = 0;
618 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
620 struct ovs_header *ovs_header = info->userhdr;
621 struct nlattr **a = info->attrs;
622 struct sw_flow_actions *acts;
623 struct sk_buff *packet;
624 struct sw_flow *flow;
633 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
634 !a[OVS_PACKET_ATTR_ACTIONS] ||
635 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
638 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], 0);
642 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
643 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
647 skb_reserve(packet, NET_IP_ALIGN);
649 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
651 skb_reset_mac_header(packet);
652 eth = eth_hdr(packet);
654 /* Normally, setting the skb 'protocol' field would be handled by a
655 * call to eth_type_trans(), but it assumes there's a sending
656 * device, which we may not have. */
657 if (ntohs(eth->h_proto) >= 1536)
658 packet->protocol = eth->h_proto;
660 packet->protocol = htons(ETH_P_802_2);
662 /* Build an sw_flow for sending this packet. */
668 err = flow_extract(packet, -1, &flow->key, &key_len, &is_frag);
672 err = flow_metadata_from_nlattrs(&flow->key.eth.in_port,
673 &flow->key.eth.tun_id,
674 a[OVS_PACKET_ATTR_KEY]);
678 flow->hash = flow_hash(&flow->key, key_len);
680 if (a[OVS_PACKET_ATTR_UPCALL_PID])
681 flow->upcall_pid = nla_get_u32(a[OVS_PACKET_ATTR_UPCALL_PID]);
683 flow->upcall_pid = NETLINK_CB(skb).pid;
685 acts = flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
689 rcu_assign_pointer(flow->sf_acts, acts);
691 OVS_CB(packet)->flow = flow;
694 dp = get_dp(ovs_header->dp_ifindex);
699 if (flow->key.eth.in_port < DP_MAX_PORTS)
700 OVS_CB(packet)->vport = get_vport_protected(dp,
701 flow->key.eth.in_port);
704 err = execute_actions(dp, packet);
721 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
722 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
723 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
724 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
725 [OVS_PACKET_ATTR_UPCALL_PID] = { .type = NLA_U32 },
728 static struct genl_ops dp_packet_genl_ops[] = {
729 { .cmd = OVS_PACKET_CMD_EXECUTE,
730 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
731 .policy = packet_policy,
732 .doit = ovs_packet_cmd_execute
736 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
739 struct flow_table *table = get_table_protected(dp);
741 stats->n_flows = flow_tbl_count(table);
743 stats->n_frags = stats->n_hit = stats->n_missed = stats->n_lost = 0;
744 for_each_possible_cpu(i) {
745 const struct dp_stats_percpu *percpu_stats;
746 struct dp_stats_percpu local_stats;
749 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
752 seqcount = read_seqcount_begin(&percpu_stats->seqlock);
753 local_stats = *percpu_stats;
754 } while (read_seqcount_retry(&percpu_stats->seqlock, seqcount));
756 stats->n_frags += local_stats.n_frags;
757 stats->n_hit += local_stats.n_hit;
758 stats->n_missed += local_stats.n_missed;
759 stats->n_lost += local_stats.n_lost;
763 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
764 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
765 [OVS_FLOW_ATTR_UPCALL_PID] = { .type = NLA_U32 },
766 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
767 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
770 static struct genl_family dp_flow_genl_family = {
771 .id = GENL_ID_GENERATE,
772 .hdrsize = sizeof(struct ovs_header),
773 .name = OVS_FLOW_FAMILY,
775 .maxattr = OVS_FLOW_ATTR_MAX
778 static struct genl_multicast_group dp_flow_multicast_group = {
779 .name = OVS_FLOW_MCGROUP
782 /* Called with genl_lock. */
783 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
784 struct sk_buff *skb, u32 pid, u32 seq, u32 flags, u8 cmd)
786 const int skb_orig_len = skb->len;
787 const struct sw_flow_actions *sf_acts;
788 struct ovs_flow_stats stats;
789 struct ovs_header *ovs_header;
795 sf_acts = rcu_dereference_protected(flow->sf_acts,
796 lockdep_genl_is_held());
798 ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
802 ovs_header->dp_ifindex = get_dpifindex(dp);
804 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
806 goto nla_put_failure;
807 err = flow_to_nlattrs(&flow->key, skb);
810 nla_nest_end(skb, nla);
812 NLA_PUT_U32(skb, OVS_FLOW_ATTR_UPCALL_PID, flow->upcall_pid);
814 spin_lock_bh(&flow->lock);
816 stats.n_packets = flow->packet_count;
817 stats.n_bytes = flow->byte_count;
818 tcp_flags = flow->tcp_flags;
819 spin_unlock_bh(&flow->lock);
822 NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, flow_used_time(used));
825 NLA_PUT(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats);
828 NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags);
830 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
831 * this is the first flow to be dumped into 'skb'. This is unusual for
832 * Netlink but individual action lists can be longer than
833 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
834 * The userspace caller can always fetch the actions separately if it
835 * really wants them. (Most userspace callers in fact don't care.)
837 * This can only fail for dump operations because the skb is always
838 * properly sized for single flows.
840 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
842 if (err < 0 && skb_orig_len)
845 return genlmsg_end(skb, ovs_header);
850 genlmsg_cancel(skb, ovs_header);
854 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
856 const struct sw_flow_actions *sf_acts;
859 sf_acts = rcu_dereference_protected(flow->sf_acts,
860 lockdep_genl_is_held());
862 len = nla_total_size(FLOW_BUFSIZE); /* OVS_FLOW_ATTR_KEY */
863 len += nla_total_size(sf_acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
864 len += nla_total_size(sizeof(struct ovs_flow_stats)); /* OVS_FLOW_ATTR_STATS */
865 len += nla_total_size(1); /* OVS_FLOW_ATTR_TCP_FLAGS */
866 len += nla_total_size(8); /* OVS_FLOW_ATTR_USED */
867 return genlmsg_new(NLMSG_ALIGN(sizeof(struct ovs_header)) + len, GFP_KERNEL);
870 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, struct datapath *dp,
871 u32 pid, u32 seq, u8 cmd)
876 skb = ovs_flow_cmd_alloc_info(flow);
878 return ERR_PTR(-ENOMEM);
880 retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
885 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
887 struct nlattr **a = info->attrs;
888 struct ovs_header *ovs_header = info->userhdr;
889 struct sw_flow_key key;
890 struct sw_flow *flow;
891 struct sk_buff *reply;
893 struct flow_table *table;
899 if (!a[OVS_FLOW_ATTR_KEY])
901 error = flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
905 /* Validate actions. */
906 if (a[OVS_FLOW_ATTR_ACTIONS]) {
907 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], 0);
910 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
915 dp = get_dp(ovs_header->dp_ifindex);
920 table = get_table_protected(dp);
921 flow = flow_tbl_lookup(table, &key, key_len);
923 struct sw_flow_actions *acts;
925 /* Bail out if we're not allowed to create a new flow. */
927 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
930 /* Expand table, if necessary, to make room. */
931 if (flow_tbl_need_to_expand(table)) {
932 struct flow_table *new_table;
934 new_table = flow_tbl_expand(table);
935 if (!IS_ERR(new_table)) {
936 rcu_assign_pointer(dp->table, new_table);
937 flow_tbl_deferred_destroy(table);
938 table = get_table_protected(dp);
945 error = PTR_ERR(flow);
951 if (a[OVS_FLOW_ATTR_UPCALL_PID])
952 flow->upcall_pid = nla_get_u32(a[OVS_FLOW_ATTR_UPCALL_PID]);
954 flow->upcall_pid = NETLINK_CB(skb).pid;
956 /* Obtain actions. */
957 acts = flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
958 error = PTR_ERR(acts);
960 goto error_free_flow;
961 rcu_assign_pointer(flow->sf_acts, acts);
963 /* Put flow in bucket. */
964 flow->hash = flow_hash(&key, key_len);
965 flow_tbl_insert(table, flow);
967 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
968 info->snd_seq, OVS_FLOW_CMD_NEW);
970 /* We found a matching flow. */
971 struct sw_flow_actions *old_acts;
973 /* Bail out if we're not allowed to modify an existing flow.
974 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
975 * because Generic Netlink treats the latter as a dump
976 * request. We also accept NLM_F_EXCL in case that bug ever
980 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
981 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
984 /* Update actions. */
985 old_acts = rcu_dereference_protected(flow->sf_acts,
986 lockdep_genl_is_held());
987 if (a[OVS_FLOW_ATTR_ACTIONS] &&
988 (old_acts->actions_len != nla_len(a[OVS_FLOW_ATTR_ACTIONS]) ||
989 memcmp(old_acts->actions, nla_data(a[OVS_FLOW_ATTR_ACTIONS]),
990 old_acts->actions_len))) {
991 struct sw_flow_actions *new_acts;
993 new_acts = flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
994 error = PTR_ERR(new_acts);
995 if (IS_ERR(new_acts))
998 rcu_assign_pointer(flow->sf_acts, new_acts);
999 flow_deferred_free_acts(old_acts);
1002 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1003 info->snd_seq, OVS_FLOW_CMD_NEW);
1005 if (a[OVS_FLOW_ATTR_UPCALL_PID])
1006 flow->upcall_pid = nla_get_u32(a[OVS_FLOW_ATTR_UPCALL_PID]);
1009 if (a[OVS_FLOW_ATTR_CLEAR]) {
1010 spin_lock_bh(&flow->lock);
1012 spin_unlock_bh(&flow->lock);
1017 genl_notify(reply, genl_info_net(info), info->snd_pid,
1018 dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1020 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1021 dp_flow_multicast_group.id, PTR_ERR(reply));
1030 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1032 struct nlattr **a = info->attrs;
1033 struct ovs_header *ovs_header = info->userhdr;
1034 struct sw_flow_key key;
1035 struct sk_buff *reply;
1036 struct sw_flow *flow;
1037 struct datapath *dp;
1038 struct flow_table *table;
1042 if (!a[OVS_FLOW_ATTR_KEY])
1044 err = flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1048 dp = get_dp(ovs_header->dp_ifindex);
1052 table = get_table_protected(dp);
1053 flow = flow_tbl_lookup(table, &key, key_len);
1057 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, info->snd_seq, OVS_FLOW_CMD_NEW);
1059 return PTR_ERR(reply);
1061 return genlmsg_reply(reply, info);
1064 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1066 struct nlattr **a = info->attrs;
1067 struct ovs_header *ovs_header = info->userhdr;
1068 struct sw_flow_key key;
1069 struct sk_buff *reply;
1070 struct sw_flow *flow;
1071 struct datapath *dp;
1072 struct flow_table *table;
1076 if (!a[OVS_FLOW_ATTR_KEY])
1077 return flush_flows(ovs_header->dp_ifindex);
1078 err = flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1082 dp = get_dp(ovs_header->dp_ifindex);
1086 table = get_table_protected(dp);
1087 flow = flow_tbl_lookup(table, &key, key_len);
1091 reply = ovs_flow_cmd_alloc_info(flow);
1095 flow_tbl_remove(table, flow);
1097 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
1098 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1101 flow_deferred_free(flow);
1103 genl_notify(reply, genl_info_net(info), info->snd_pid,
1104 dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1108 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1110 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1111 struct datapath *dp;
1113 dp = get_dp(ovs_header->dp_ifindex);
1118 struct sw_flow *flow;
1121 bucket = cb->args[0];
1123 flow = flow_tbl_next(get_table_protected(dp), &bucket, &obj);
1127 if (ovs_flow_cmd_fill_info(flow, dp, skb, NETLINK_CB(cb->skb).pid,
1128 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1129 OVS_FLOW_CMD_NEW) < 0)
1132 cb->args[0] = bucket;
1138 static struct genl_ops dp_flow_genl_ops[] = {
1139 { .cmd = OVS_FLOW_CMD_NEW,
1140 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1141 .policy = flow_policy,
1142 .doit = ovs_flow_cmd_new_or_set
1144 { .cmd = OVS_FLOW_CMD_DEL,
1145 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1146 .policy = flow_policy,
1147 .doit = ovs_flow_cmd_del
1149 { .cmd = OVS_FLOW_CMD_GET,
1150 .flags = 0, /* OK for unprivileged users. */
1151 .policy = flow_policy,
1152 .doit = ovs_flow_cmd_get,
1153 .dumpit = ovs_flow_cmd_dump
1155 { .cmd = OVS_FLOW_CMD_SET,
1156 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1157 .policy = flow_policy,
1158 .doit = ovs_flow_cmd_new_or_set,
1162 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1163 #ifdef HAVE_NLA_NUL_STRING
1164 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1166 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1167 [OVS_DP_ATTR_IPV4_FRAGS] = { .type = NLA_U32 },
1170 static struct genl_family dp_datapath_genl_family = {
1171 .id = GENL_ID_GENERATE,
1172 .hdrsize = sizeof(struct ovs_header),
1173 .name = OVS_DATAPATH_FAMILY,
1175 .maxattr = OVS_DP_ATTR_MAX
1178 static struct genl_multicast_group dp_datapath_multicast_group = {
1179 .name = OVS_DATAPATH_MCGROUP
1182 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1183 u32 pid, u32 seq, u32 flags, u8 cmd)
1185 struct ovs_header *ovs_header;
1189 ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
1194 ovs_header->dp_ifindex = get_dpifindex(dp);
1197 err = nla_put_string(skb, OVS_DP_ATTR_NAME, dp_name(dp));
1200 goto nla_put_failure;
1202 nla = nla_reserve(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats));
1204 goto nla_put_failure;
1205 get_dp_stats(dp, nla_data(nla));
1207 NLA_PUT_U32(skb, OVS_DP_ATTR_IPV4_FRAGS,
1208 dp->drop_frags ? OVS_DP_FRAG_DROP : OVS_DP_FRAG_ZERO);
1210 return genlmsg_end(skb, ovs_header);
1213 genlmsg_cancel(skb, ovs_header);
1218 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid,
1221 struct sk_buff *skb;
1224 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1226 return ERR_PTR(-ENOMEM);
1228 retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
1231 return ERR_PTR(retval);
1236 static int ovs_dp_cmd_validate(struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1238 if (a[OVS_DP_ATTR_IPV4_FRAGS]) {
1239 u32 frags = nla_get_u32(a[OVS_DP_ATTR_IPV4_FRAGS]);
1241 if (frags != OVS_DP_FRAG_ZERO && frags != OVS_DP_FRAG_DROP)
1245 return CHECK_NUL_STRING(a[OVS_DP_ATTR_NAME], IFNAMSIZ - 1);
1248 /* Called with genl_mutex and optionally with RTNL lock also. */
1249 static struct datapath *lookup_datapath(struct ovs_header *ovs_header, struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1251 struct datapath *dp;
1253 if (!a[OVS_DP_ATTR_NAME])
1254 dp = get_dp(ovs_header->dp_ifindex);
1256 struct vport *vport;
1259 vport = vport_locate(nla_data(a[OVS_DP_ATTR_NAME]));
1260 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1263 return dp ? dp : ERR_PTR(-ENODEV);
1266 /* Called with genl_mutex. */
1267 static void change_datapath(struct datapath *dp, struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1269 if (a[OVS_DP_ATTR_IPV4_FRAGS])
1270 dp->drop_frags = nla_get_u32(a[OVS_DP_ATTR_IPV4_FRAGS]) == OVS_DP_FRAG_DROP;
1273 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1275 struct nlattr **a = info->attrs;
1276 struct vport_parms parms;
1277 struct sk_buff *reply;
1278 struct datapath *dp;
1279 struct vport *vport;
1283 if (!a[OVS_DP_ATTR_NAME])
1286 err = ovs_dp_cmd_validate(a);
1292 if (!try_module_get(THIS_MODULE))
1293 goto err_unlock_rtnl;
1296 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1298 goto err_put_module;
1299 INIT_LIST_HEAD(&dp->port_list);
1301 /* Initialize kobject for bridge. This will be added as
1302 * /sys/class/net/<devname>/brif later, if sysfs is enabled. */
1303 dp->ifobj.kset = NULL;
1304 kobject_init(&dp->ifobj, &dp_ktype);
1306 /* Allocate table. */
1308 rcu_assign_pointer(dp->table, flow_tbl_alloc(TBL_MIN_BUCKETS));
1313 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1314 if (!dp->stats_percpu) {
1316 goto err_destroy_table;
1319 change_datapath(dp, a);
1321 /* Set up our datapath device. */
1322 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1323 parms.type = OVS_VPORT_TYPE_INTERNAL;
1324 parms.options = NULL;
1326 parms.port_no = OVSP_LOCAL;
1327 if (a[OVS_DP_ATTR_UPCALL_PID])
1328 parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1330 parms.upcall_pid = NETLINK_CB(skb).pid;
1332 vport = new_vport(&parms);
1333 if (IS_ERR(vport)) {
1334 err = PTR_ERR(vport);
1338 goto err_destroy_percpu;
1341 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, OVS_DP_CMD_NEW);
1342 err = PTR_ERR(reply);
1344 goto err_destroy_local_port;
1346 list_add_tail(&dp->list_node, &dps);
1347 dp_sysfs_add_dp(dp);
1351 genl_notify(reply, genl_info_net(info), info->snd_pid,
1352 dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1355 err_destroy_local_port:
1356 dp_detach_port(get_vport_protected(dp, OVSP_LOCAL));
1358 free_percpu(dp->stats_percpu);
1360 flow_tbl_destroy(get_table_protected(dp));
1364 module_put(THIS_MODULE);
1371 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1373 struct vport *vport, *next_vport;
1374 struct sk_buff *reply;
1375 struct datapath *dp;
1378 err = ovs_dp_cmd_validate(info->attrs);
1383 dp = lookup_datapath(info->userhdr, info->attrs);
1388 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, OVS_DP_CMD_DEL);
1389 err = PTR_ERR(reply);
1393 list_for_each_entry_safe (vport, next_vport, &dp->port_list, node)
1394 if (vport->port_no != OVSP_LOCAL)
1395 dp_detach_port(vport);
1397 dp_sysfs_del_dp(dp);
1398 list_del(&dp->list_node);
1399 dp_detach_port(get_vport_protected(dp, OVSP_LOCAL));
1401 /* rtnl_unlock() will wait until all the references to devices that
1402 * are pending unregistration have been dropped. We do it here to
1403 * ensure that any internal devices (which contain DP pointers) are
1404 * fully destroyed before freeing the datapath.
1408 call_rcu(&dp->rcu, destroy_dp_rcu);
1409 module_put(THIS_MODULE);
1411 genl_notify(reply, genl_info_net(info), info->snd_pid,
1412 dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1422 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1424 struct sk_buff *reply;
1425 struct datapath *dp;
1428 err = ovs_dp_cmd_validate(info->attrs);
1432 dp = lookup_datapath(info->userhdr, info->attrs);
1436 change_datapath(dp, info->attrs);
1438 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, OVS_DP_CMD_NEW);
1439 if (IS_ERR(reply)) {
1440 err = PTR_ERR(reply);
1441 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1442 dp_datapath_multicast_group.id, err);
1446 genl_notify(reply, genl_info_net(info), info->snd_pid,
1447 dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1451 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1453 struct sk_buff *reply;
1454 struct datapath *dp;
1457 err = ovs_dp_cmd_validate(info->attrs);
1461 dp = lookup_datapath(info->userhdr, info->attrs);
1465 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, OVS_DP_CMD_NEW);
1467 return PTR_ERR(reply);
1469 return genlmsg_reply(reply, info);
1472 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1474 struct datapath *dp;
1475 int skip = cb->args[0];
1478 list_for_each_entry (dp, &dps, list_node) {
1481 if (ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1482 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1483 OVS_DP_CMD_NEW) < 0)
1493 static struct genl_ops dp_datapath_genl_ops[] = {
1494 { .cmd = OVS_DP_CMD_NEW,
1495 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1496 .policy = datapath_policy,
1497 .doit = ovs_dp_cmd_new
1499 { .cmd = OVS_DP_CMD_DEL,
1500 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1501 .policy = datapath_policy,
1502 .doit = ovs_dp_cmd_del
1504 { .cmd = OVS_DP_CMD_GET,
1505 .flags = 0, /* OK for unprivileged users. */
1506 .policy = datapath_policy,
1507 .doit = ovs_dp_cmd_get,
1508 .dumpit = ovs_dp_cmd_dump
1510 { .cmd = OVS_DP_CMD_SET,
1511 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1512 .policy = datapath_policy,
1513 .doit = ovs_dp_cmd_set,
1517 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1518 #ifdef HAVE_NLA_NUL_STRING
1519 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1520 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1521 [OVS_VPORT_ATTR_ADDRESS] = { .len = ETH_ALEN },
1523 [OVS_VPORT_ATTR_STATS] = { .minlen = sizeof(struct ovs_vport_stats) },
1524 [OVS_VPORT_ATTR_ADDRESS] = { .minlen = ETH_ALEN },
1526 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1527 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1528 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1529 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1532 static struct genl_family dp_vport_genl_family = {
1533 .id = GENL_ID_GENERATE,
1534 .hdrsize = sizeof(struct ovs_header),
1535 .name = OVS_VPORT_FAMILY,
1537 .maxattr = OVS_VPORT_ATTR_MAX
1540 struct genl_multicast_group dp_vport_multicast_group = {
1541 .name = OVS_VPORT_MCGROUP
1544 /* Called with RTNL lock or RCU read lock. */
1545 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1546 u32 pid, u32 seq, u32 flags, u8 cmd)
1548 struct ovs_header *ovs_header;
1552 ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
1557 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1559 NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no);
1560 NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport_get_type(vport));
1561 NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport_get_name(vport));
1562 NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid);
1564 nla = nla_reserve(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats));
1566 goto nla_put_failure;
1568 vport_get_stats(vport, nla_data(nla));
1570 NLA_PUT(skb, OVS_VPORT_ATTR_ADDRESS, ETH_ALEN, vport_get_addr(vport));
1572 err = vport_get_options(vport, skb);
1573 if (err == -EMSGSIZE)
1576 return genlmsg_end(skb, ovs_header);
1581 genlmsg_cancel(skb, ovs_header);
1585 /* Called with RTNL lock or RCU read lock. */
1586 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
1589 struct sk_buff *skb;
1592 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1594 return ERR_PTR(-ENOMEM);
1596 retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
1599 return ERR_PTR(retval);
1604 static int ovs_vport_cmd_validate(struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1606 return CHECK_NUL_STRING(a[OVS_VPORT_ATTR_NAME], IFNAMSIZ - 1);
1609 /* Called with RTNL lock or RCU read lock. */
1610 static struct vport *lookup_vport(struct ovs_header *ovs_header,
1611 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1613 struct datapath *dp;
1614 struct vport *vport;
1616 if (a[OVS_VPORT_ATTR_NAME]) {
1617 vport = vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME]));
1619 return ERR_PTR(-ENODEV);
1621 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1622 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1624 if (port_no >= DP_MAX_PORTS)
1625 return ERR_PTR(-EFBIG);
1627 dp = get_dp(ovs_header->dp_ifindex);
1629 return ERR_PTR(-ENODEV);
1631 vport = get_vport_protected(dp, port_no);
1633 return ERR_PTR(-ENOENT);
1636 return ERR_PTR(-EINVAL);
1639 /* Called with RTNL lock. */
1640 static int change_vport(struct vport *vport, struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1644 if (a[OVS_VPORT_ATTR_STATS])
1645 vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1647 if (a[OVS_VPORT_ATTR_ADDRESS])
1648 err = vport_set_addr(vport, nla_data(a[OVS_VPORT_ATTR_ADDRESS]));
1653 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1655 struct nlattr **a = info->attrs;
1656 struct ovs_header *ovs_header = info->userhdr;
1657 struct vport_parms parms;
1658 struct sk_buff *reply;
1659 struct vport *vport;
1660 struct datapath *dp;
1665 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE])
1668 err = ovs_vport_cmd_validate(a);
1673 dp = get_dp(ovs_header->dp_ifindex);
1678 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1679 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1682 if (port_no >= DP_MAX_PORTS)
1685 vport = get_vport_protected(dp, port_no);
1690 for (port_no = 1; ; port_no++) {
1691 if (port_no >= DP_MAX_PORTS) {
1695 vport = get_vport_protected(dp, port_no);
1701 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1702 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1703 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1705 parms.port_no = port_no;
1706 if (a[OVS_VPORT_ATTR_UPCALL_PID])
1707 parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1709 parms.upcall_pid = NETLINK_CB(skb).pid;
1711 vport = new_vport(&parms);
1712 err = PTR_ERR(vport);
1716 dp_sysfs_add_if(vport);
1718 err = change_vport(vport, a);
1720 reply = ovs_vport_cmd_build_info(vport, info->snd_pid,
1721 info->snd_seq, OVS_VPORT_CMD_NEW);
1723 err = PTR_ERR(reply);
1726 dp_detach_port(vport);
1729 genl_notify(reply, genl_info_net(info), info->snd_pid,
1730 dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1739 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1741 struct nlattr **a = info->attrs;
1742 struct sk_buff *reply;
1743 struct vport *vport;
1746 err = ovs_vport_cmd_validate(a);
1751 vport = lookup_vport(info->userhdr, a);
1752 err = PTR_ERR(vport);
1757 if (a[OVS_VPORT_ATTR_OPTIONS])
1758 err = vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1760 err = change_vport(vport, a);
1761 if (!err && a[OVS_VPORT_ATTR_UPCALL_PID])
1762 vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1764 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1766 if (IS_ERR(reply)) {
1767 err = PTR_ERR(reply);
1768 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1769 dp_vport_multicast_group.id, err);
1773 genl_notify(reply, genl_info_net(info), info->snd_pid,
1774 dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1782 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1784 struct nlattr **a = info->attrs;
1785 struct sk_buff *reply;
1786 struct vport *vport;
1789 err = ovs_vport_cmd_validate(a);
1794 vport = lookup_vport(info->userhdr, a);
1795 err = PTR_ERR(vport);
1799 if (vport->port_no == OVSP_LOCAL) {
1804 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1806 err = PTR_ERR(reply);
1810 dp_detach_port(vport);
1812 genl_notify(reply, genl_info_net(info), info->snd_pid,
1813 dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1821 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1823 struct nlattr **a = info->attrs;
1824 struct ovs_header *ovs_header = info->userhdr;
1825 struct sk_buff *reply;
1826 struct vport *vport;
1829 err = ovs_vport_cmd_validate(a);
1834 vport = lookup_vport(ovs_header, a);
1835 err = PTR_ERR(vport);
1839 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1841 err = PTR_ERR(reply);
1847 return genlmsg_reply(reply, info);
1855 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1857 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1858 struct datapath *dp;
1862 dp = get_dp(ovs_header->dp_ifindex);
1867 for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
1868 struct vport *vport;
1870 vport = get_vport_protected(dp, port_no);
1874 if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
1875 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1876 OVS_VPORT_CMD_NEW) < 0)
1881 cb->args[0] = port_no;
1887 static struct genl_ops dp_vport_genl_ops[] = {
1888 { .cmd = OVS_VPORT_CMD_NEW,
1889 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1890 .policy = vport_policy,
1891 .doit = ovs_vport_cmd_new
1893 { .cmd = OVS_VPORT_CMD_DEL,
1894 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1895 .policy = vport_policy,
1896 .doit = ovs_vport_cmd_del
1898 { .cmd = OVS_VPORT_CMD_GET,
1899 .flags = 0, /* OK for unprivileged users. */
1900 .policy = vport_policy,
1901 .doit = ovs_vport_cmd_get,
1902 .dumpit = ovs_vport_cmd_dump
1904 { .cmd = OVS_VPORT_CMD_SET,
1905 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1906 .policy = vport_policy,
1907 .doit = ovs_vport_cmd_set,
1911 struct genl_family_and_ops {
1912 struct genl_family *family;
1913 struct genl_ops *ops;
1915 struct genl_multicast_group *group;
1918 static const struct genl_family_and_ops dp_genl_families[] = {
1919 { &dp_datapath_genl_family,
1920 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1921 &dp_datapath_multicast_group },
1922 { &dp_vport_genl_family,
1923 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1924 &dp_vport_multicast_group },
1925 { &dp_flow_genl_family,
1926 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1927 &dp_flow_multicast_group },
1928 { &dp_packet_genl_family,
1929 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1933 static void dp_unregister_genl(int n_families)
1937 for (i = 0; i < n_families; i++)
1938 genl_unregister_family(dp_genl_families[i].family);
1941 static int dp_register_genl(void)
1948 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1949 const struct genl_family_and_ops *f = &dp_genl_families[i];
1951 err = genl_register_family_with_ops(f->family, f->ops,
1958 err = genl_register_mc_group(f->family, f->group);
1967 dp_unregister_genl(n_registered);
1971 static int __init dp_init(void)
1973 struct sk_buff *dummy_skb;
1976 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
1978 printk("Open vSwitch %s, built "__DATE__" "__TIME__"\n", VERSION BUILDNR);
1986 goto error_tnl_exit;
1990 goto error_flow_exit;
1992 err = register_netdevice_notifier(&dp_device_notifier);
1994 goto error_vport_exit;
1996 err = dp_register_genl();
1998 goto error_unreg_notifier;
2002 error_unreg_notifier:
2003 unregister_netdevice_notifier(&dp_device_notifier);
2014 static void dp_cleanup(void)
2017 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2018 unregister_netdevice_notifier(&dp_device_notifier);
2024 module_init(dp_init);
2025 module_exit(dp_cleanup);
2027 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2028 MODULE_LICENSE("GPL");