2 * Copyright (c) 2007-2014 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/if_arp.h>
24 #include <linux/if_vlan.h>
27 #include <linux/jhash.h>
28 #include <linux/delay.h>
29 #include <linux/time.h>
30 #include <linux/etherdevice.h>
31 #include <linux/genetlink.h>
32 #include <linux/kernel.h>
33 #include <linux/kthread.h>
34 #include <linux/mutex.h>
35 #include <linux/percpu.h>
36 #include <linux/rcupdate.h>
37 #include <linux/tcp.h>
38 #include <linux/udp.h>
39 #include <linux/ethtool.h>
40 #include <linux/wait.h>
41 #include <asm/div64.h>
42 #include <linux/highmem.h>
43 #include <linux/netfilter_bridge.h>
44 #include <linux/netfilter_ipv4.h>
45 #include <linux/inetdevice.h>
46 #include <linux/list.h>
47 #include <linux/openvswitch.h>
48 #include <linux/rculist.h>
49 #include <linux/dmi.h>
50 #include <net/genetlink.h>
51 #include <net/net_namespace.h>
52 #include <net/netns/generic.h>
56 #include "flow_table.h"
57 #include "flow_netlink.h"
58 #include "vport-internal_dev.h"
59 #include "vport-netdev.h"
61 unsigned int ovs_net_id __read_mostly;
63 static struct genl_family dp_packet_genl_family;
64 static struct genl_family dp_flow_genl_family;
65 static struct genl_family dp_datapath_genl_family;
67 static const struct nla_policy flow_policy[];
69 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
70 .name = OVS_FLOW_MCGROUP,
73 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
74 .name = OVS_DATAPATH_MCGROUP,
77 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
78 .name = OVS_VPORT_MCGROUP,
81 /* Check if need to build a reply message.
82 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
83 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
86 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
87 genl_has_listeners(family, genl_info_net(info), group);
90 static void ovs_notify(struct genl_family *family,
91 struct sk_buff *skb, struct genl_info *info)
93 genl_notify(family, skb, info, 0, GFP_KERNEL);
99 * All writes e.g. Writes to device state (add/remove datapath, port, set
100 * operations on vports, etc.), Writes to other state (flow table
101 * modifications, set miscellaneous datapath parameters, etc.) are protected
104 * Reads are protected by RCU.
106 * There are a few special cases (mostly stats) that have their own
107 * synchronization but they nest under all of above and don't interact with
110 * The RTNL lock nests inside ovs_mutex.
113 static DEFINE_MUTEX(ovs_mutex);
117 mutex_lock(&ovs_mutex);
120 void ovs_unlock(void)
122 mutex_unlock(&ovs_mutex);
125 #ifdef CONFIG_LOCKDEP
126 int lockdep_ovsl_is_held(void)
129 return lockdep_is_held(&ovs_mutex);
135 static struct vport *new_vport(const struct vport_parms *);
136 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
137 const struct sw_flow_key *,
138 const struct dp_upcall_info *,
140 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
141 const struct sw_flow_key *,
142 const struct dp_upcall_info *,
145 /* Must be called with rcu_read_lock. */
146 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
148 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
151 struct vport *vport = ovs_internal_dev_get_vport(dev);
159 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
160 * returned dp pointer valid.
162 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
166 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
168 dp = get_dp_rcu(net, dp_ifindex);
174 /* Must be called with rcu_read_lock or ovs_mutex. */
175 const char *ovs_dp_name(const struct datapath *dp)
177 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
178 return ovs_vport_name(vport);
181 static int get_dpifindex(const struct datapath *dp)
188 local = ovs_vport_rcu(dp, OVSP_LOCAL);
190 ifindex = local->dev->ifindex;
199 static void destroy_dp_rcu(struct rcu_head *rcu)
201 struct datapath *dp = container_of(rcu, struct datapath, rcu);
203 ovs_flow_tbl_destroy(&dp->table);
204 free_percpu(dp->stats_percpu);
209 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
212 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
215 /* Called with ovs_mutex or RCU read lock. */
216 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
219 struct hlist_head *head;
221 head = vport_hash_bucket(dp, port_no);
222 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
223 if (vport->port_no == port_no)
229 /* Called with ovs_mutex. */
230 static struct vport *new_vport(const struct vport_parms *parms)
234 vport = ovs_vport_add(parms);
235 if (!IS_ERR(vport)) {
236 struct datapath *dp = parms->dp;
237 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
239 hlist_add_head_rcu(&vport->dp_hash_node, head);
244 void ovs_dp_detach_port(struct vport *p)
248 /* First drop references to device. */
249 hlist_del_rcu(&p->dp_hash_node);
251 /* Then destroy it. */
255 /* Must be called with rcu_read_lock. */
256 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
258 const struct vport *p = OVS_CB(skb)->input_vport;
259 struct datapath *dp = p->dp;
260 struct sw_flow *flow;
261 struct sw_flow_actions *sf_acts;
262 struct dp_stats_percpu *stats;
266 stats = this_cpu_ptr(dp->stats_percpu);
269 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
270 if (unlikely(!flow)) {
271 struct dp_upcall_info upcall;
274 memset(&upcall, 0, sizeof(upcall));
275 upcall.cmd = OVS_PACKET_CMD_MISS;
276 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
277 upcall.mru = OVS_CB(skb)->mru;
278 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
283 stats_counter = &stats->n_missed;
287 ovs_flow_stats_update(flow, key->tp.flags, skb);
288 sf_acts = rcu_dereference(flow->sf_acts);
289 ovs_execute_actions(dp, skb, sf_acts, key);
291 stats_counter = &stats->n_hit;
294 /* Update datapath statistics. */
295 u64_stats_update_begin(&stats->syncp);
297 stats->n_mask_hit += n_mask_hit;
298 u64_stats_update_end(&stats->syncp);
301 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
302 const struct sw_flow_key *key,
303 const struct dp_upcall_info *upcall_info,
306 struct dp_stats_percpu *stats;
309 if (upcall_info->portid == 0) {
314 if (!skb_is_gso(skb))
315 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
317 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
324 stats = this_cpu_ptr(dp->stats_percpu);
326 u64_stats_update_begin(&stats->syncp);
328 u64_stats_update_end(&stats->syncp);
333 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
334 const struct sw_flow_key *key,
335 const struct dp_upcall_info *upcall_info,
338 unsigned short gso_type = skb_shinfo(skb)->gso_type;
339 struct sw_flow_key later_key;
340 struct sk_buff *segs, *nskb;
343 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
344 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
346 return PTR_ERR(segs);
350 if (gso_type & SKB_GSO_UDP) {
351 /* The initial flow key extracted by ovs_flow_key_extract()
352 * in this case is for a first fragment, so we need to
353 * properly mark later fragments.
356 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
359 /* Queue all of the segments. */
362 if (gso_type & SKB_GSO_UDP && skb != segs)
365 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
369 } while ((skb = skb->next));
371 /* Free all of the segments. */
379 } while ((skb = nskb));
383 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
384 unsigned int hdrlen, int actions_attrlen)
386 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
387 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
388 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
389 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
391 /* OVS_PACKET_ATTR_USERDATA */
392 if (upcall_info->userdata)
393 size += NLA_ALIGN(upcall_info->userdata->nla_len);
395 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
396 if (upcall_info->egress_tun_info)
397 size += nla_total_size(ovs_tun_key_attr_size());
399 /* OVS_PACKET_ATTR_ACTIONS */
400 if (upcall_info->actions_len)
401 size += nla_total_size(actions_attrlen);
403 /* OVS_PACKET_ATTR_MRU */
404 if (upcall_info->mru)
405 size += nla_total_size(sizeof(upcall_info->mru));
410 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
412 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
413 size_t plen = NLA_ALIGN(skb->len) - skb->len;
416 skb_put_zero(skb, plen);
420 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
421 const struct sw_flow_key *key,
422 const struct dp_upcall_info *upcall_info,
425 struct ovs_header *upcall;
426 struct sk_buff *nskb = NULL;
427 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
433 dp_ifindex = get_dpifindex(dp);
437 if (skb_vlan_tag_present(skb)) {
438 nskb = skb_clone(skb, GFP_ATOMIC);
442 nskb = __vlan_hwaccel_push_inside(nskb);
449 if (nla_attr_size(skb->len) > USHRT_MAX) {
454 /* Complete checksum if needed */
455 if (skb->ip_summed == CHECKSUM_PARTIAL &&
456 (err = skb_csum_hwoffload_help(skb, 0)))
459 /* Older versions of OVS user space enforce alignment of the last
460 * Netlink attribute to NLA_ALIGNTO which would require extensive
461 * padding logic. Only perform zerocopy if padding is not required.
463 if (dp->user_features & OVS_DP_F_UNALIGNED)
464 hlen = skb_zerocopy_headlen(skb);
468 len = upcall_msg_size(upcall_info, hlen - cutlen,
469 OVS_CB(skb)->acts_origlen);
470 user_skb = genlmsg_new(len, GFP_ATOMIC);
476 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
477 0, upcall_info->cmd);
478 upcall->dp_ifindex = dp_ifindex;
480 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
483 if (upcall_info->userdata)
484 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
485 nla_len(upcall_info->userdata),
486 nla_data(upcall_info->userdata));
488 if (upcall_info->egress_tun_info) {
489 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
490 err = ovs_nla_put_tunnel_info(user_skb,
491 upcall_info->egress_tun_info);
493 nla_nest_end(user_skb, nla);
496 if (upcall_info->actions_len) {
497 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
498 err = ovs_nla_put_actions(upcall_info->actions,
499 upcall_info->actions_len,
502 nla_nest_end(user_skb, nla);
504 nla_nest_cancel(user_skb, nla);
507 /* Add OVS_PACKET_ATTR_MRU */
508 if (upcall_info->mru) {
509 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
514 pad_packet(dp, user_skb);
517 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
519 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
524 pad_packet(dp, user_skb);
527 /* Only reserve room for attribute header, packet data is added
528 * in skb_zerocopy() */
529 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
533 nla->nla_len = nla_attr_size(skb->len - cutlen);
535 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
539 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
540 pad_packet(dp, user_skb);
542 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
544 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
554 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
556 struct ovs_header *ovs_header = info->userhdr;
557 struct net *net = sock_net(skb->sk);
558 struct nlattr **a = info->attrs;
559 struct sw_flow_actions *acts;
560 struct sk_buff *packet;
561 struct sw_flow *flow;
562 struct sw_flow_actions *sf_acts;
564 struct vport *input_vport;
568 bool log = !a[OVS_PACKET_ATTR_PROBE];
571 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
572 !a[OVS_PACKET_ATTR_ACTIONS])
575 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
576 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
580 skb_reserve(packet, NET_IP_ALIGN);
582 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
584 /* Set packet's mru */
585 if (a[OVS_PACKET_ATTR_MRU]) {
586 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
587 packet->ignore_df = 1;
589 OVS_CB(packet)->mru = mru;
591 /* Build an sw_flow for sending this packet. */
592 flow = ovs_flow_alloc();
597 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
598 packet, &flow->key, log);
602 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
603 &flow->key, &acts, log);
607 rcu_assign_pointer(flow->sf_acts, acts);
608 packet->priority = flow->key.phy.priority;
609 packet->mark = flow->key.phy.skb_mark;
612 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
617 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
619 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
624 packet->dev = input_vport->dev;
625 OVS_CB(packet)->input_vport = input_vport;
626 sf_acts = rcu_dereference(flow->sf_acts);
629 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
633 ovs_flow_free(flow, false);
639 ovs_flow_free(flow, false);
646 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
647 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
648 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
649 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
650 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
651 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
654 static const struct genl_ops dp_packet_genl_ops[] = {
655 { .cmd = OVS_PACKET_CMD_EXECUTE,
656 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
657 .policy = packet_policy,
658 .doit = ovs_packet_cmd_execute
662 static struct genl_family dp_packet_genl_family __ro_after_init = {
663 .hdrsize = sizeof(struct ovs_header),
664 .name = OVS_PACKET_FAMILY,
665 .version = OVS_PACKET_VERSION,
666 .maxattr = OVS_PACKET_ATTR_MAX,
668 .parallel_ops = true,
669 .ops = dp_packet_genl_ops,
670 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
671 .module = THIS_MODULE,
674 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
675 struct ovs_dp_megaflow_stats *mega_stats)
679 memset(mega_stats, 0, sizeof(*mega_stats));
681 stats->n_flows = ovs_flow_tbl_count(&dp->table);
682 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
684 stats->n_hit = stats->n_missed = stats->n_lost = 0;
686 for_each_possible_cpu(i) {
687 const struct dp_stats_percpu *percpu_stats;
688 struct dp_stats_percpu local_stats;
691 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
694 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
695 local_stats = *percpu_stats;
696 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
698 stats->n_hit += local_stats.n_hit;
699 stats->n_missed += local_stats.n_missed;
700 stats->n_lost += local_stats.n_lost;
701 mega_stats->n_mask_hit += local_stats.n_mask_hit;
705 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
707 return ovs_identifier_is_ufid(sfid) &&
708 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
711 static bool should_fill_mask(uint32_t ufid_flags)
713 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
716 static bool should_fill_actions(uint32_t ufid_flags)
718 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
721 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
722 const struct sw_flow_id *sfid,
725 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
727 /* OVS_FLOW_ATTR_UFID */
728 if (sfid && ovs_identifier_is_ufid(sfid))
729 len += nla_total_size(sfid->ufid_len);
731 /* OVS_FLOW_ATTR_KEY */
732 if (!sfid || should_fill_key(sfid, ufid_flags))
733 len += nla_total_size(ovs_key_attr_size());
735 /* OVS_FLOW_ATTR_MASK */
736 if (should_fill_mask(ufid_flags))
737 len += nla_total_size(ovs_key_attr_size());
739 /* OVS_FLOW_ATTR_ACTIONS */
740 if (should_fill_actions(ufid_flags))
741 len += nla_total_size(acts->orig_len);
744 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
745 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
746 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
749 /* Called with ovs_mutex or RCU read lock. */
750 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
753 struct ovs_flow_stats stats;
757 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
760 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
764 if (stats.n_packets &&
765 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
766 sizeof(struct ovs_flow_stats), &stats,
770 if ((u8)ntohs(tcp_flags) &&
771 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
777 /* Called with ovs_mutex or RCU read lock. */
778 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
779 struct sk_buff *skb, int skb_orig_len)
781 struct nlattr *start;
784 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
785 * this is the first flow to be dumped into 'skb'. This is unusual for
786 * Netlink but individual action lists can be longer than
787 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
788 * The userspace caller can always fetch the actions separately if it
789 * really wants them. (Most userspace callers in fact don't care.)
791 * This can only fail for dump operations because the skb is always
792 * properly sized for single flows.
794 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
796 const struct sw_flow_actions *sf_acts;
798 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
799 err = ovs_nla_put_actions(sf_acts->actions,
800 sf_acts->actions_len, skb);
803 nla_nest_end(skb, start);
808 nla_nest_cancel(skb, start);
810 } else if (skb_orig_len) {
817 /* Called with ovs_mutex or RCU read lock. */
818 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
819 struct sk_buff *skb, u32 portid,
820 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
822 const int skb_orig_len = skb->len;
823 struct ovs_header *ovs_header;
826 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
831 ovs_header->dp_ifindex = dp_ifindex;
833 err = ovs_nla_put_identifier(flow, skb);
837 if (should_fill_key(&flow->id, ufid_flags)) {
838 err = ovs_nla_put_masked_key(flow, skb);
843 if (should_fill_mask(ufid_flags)) {
844 err = ovs_nla_put_mask(flow, skb);
849 err = ovs_flow_cmd_fill_stats(flow, skb);
853 if (should_fill_actions(ufid_flags)) {
854 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
859 genlmsg_end(skb, ovs_header);
863 genlmsg_cancel(skb, ovs_header);
867 /* May not be called with RCU read lock. */
868 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
869 const struct sw_flow_id *sfid,
870 struct genl_info *info,
877 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
880 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
881 skb = genlmsg_new(len, GFP_KERNEL);
883 return ERR_PTR(-ENOMEM);
888 /* Called with ovs_mutex. */
889 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
891 struct genl_info *info, u8 cmd,
892 bool always, u32 ufid_flags)
897 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
898 &flow->id, info, always, ufid_flags);
899 if (IS_ERR_OR_NULL(skb))
902 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
903 info->snd_portid, info->snd_seq, 0,
909 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
911 struct net *net = sock_net(skb->sk);
912 struct nlattr **a = info->attrs;
913 struct ovs_header *ovs_header = info->userhdr;
914 struct sw_flow *flow = NULL, *new_flow;
915 struct sw_flow_mask mask;
916 struct sk_buff *reply;
918 struct sw_flow_actions *acts;
919 struct sw_flow_match match;
920 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
922 bool log = !a[OVS_FLOW_ATTR_PROBE];
924 /* Must have key and actions. */
926 if (!a[OVS_FLOW_ATTR_KEY]) {
927 OVS_NLERR(log, "Flow key attr not present in new flow.");
930 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
931 OVS_NLERR(log, "Flow actions attr not present in new flow.");
935 /* Most of the time we need to allocate a new flow, do it before
938 new_flow = ovs_flow_alloc();
939 if (IS_ERR(new_flow)) {
940 error = PTR_ERR(new_flow);
945 ovs_match_init(&match, &new_flow->key, false, &mask);
946 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
947 a[OVS_FLOW_ATTR_MASK], log);
951 /* Extract flow identifier. */
952 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
953 &new_flow->key, log);
957 /* unmasked key is needed to match when ufid is not used. */
958 if (ovs_identifier_is_key(&new_flow->id))
959 match.key = new_flow->id.unmasked_key;
961 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
963 /* Validate actions. */
964 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
965 &new_flow->key, &acts, log);
967 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
971 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
974 error = PTR_ERR(reply);
979 dp = get_dp(net, ovs_header->dp_ifindex);
985 /* Check if this is a duplicate flow */
986 if (ovs_identifier_is_ufid(&new_flow->id))
987 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
989 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
991 rcu_assign_pointer(new_flow->sf_acts, acts);
993 /* Put flow in bucket. */
994 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
995 if (unlikely(error)) {
1000 if (unlikely(reply)) {
1001 error = ovs_flow_cmd_fill_info(new_flow,
1002 ovs_header->dp_ifindex,
1003 reply, info->snd_portid,
1011 struct sw_flow_actions *old_acts;
1013 /* Bail out if we're not allowed to modify an existing flow.
1014 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1015 * because Generic Netlink treats the latter as a dump
1016 * request. We also accept NLM_F_EXCL in case that bug ever
1019 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1022 goto err_unlock_ovs;
1024 /* The flow identifier has to be the same for flow updates.
1025 * Look for any overlapping flow.
1027 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1028 if (ovs_identifier_is_key(&flow->id))
1029 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1031 else /* UFID matches but key is different */
1035 goto err_unlock_ovs;
1038 /* Update actions. */
1039 old_acts = ovsl_dereference(flow->sf_acts);
1040 rcu_assign_pointer(flow->sf_acts, acts);
1042 if (unlikely(reply)) {
1043 error = ovs_flow_cmd_fill_info(flow,
1044 ovs_header->dp_ifindex,
1045 reply, info->snd_portid,
1053 ovs_nla_free_flow_actions_rcu(old_acts);
1054 ovs_flow_free(new_flow, false);
1058 ovs_notify(&dp_flow_genl_family, reply, info);
1065 ovs_nla_free_flow_actions(acts);
1067 ovs_flow_free(new_flow, false);
1072 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1073 static struct sw_flow_actions *get_flow_actions(struct net *net,
1074 const struct nlattr *a,
1075 const struct sw_flow_key *key,
1076 const struct sw_flow_mask *mask,
1079 struct sw_flow_actions *acts;
1080 struct sw_flow_key masked_key;
1083 ovs_flow_mask_key(&masked_key, key, true, mask);
1084 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1087 "Actions may not be safe on all matching packets");
1088 return ERR_PTR(error);
1094 /* Factor out match-init and action-copy to avoid
1095 * "Wframe-larger-than=1024" warning. Because mask is only
1096 * used to get actions, we new a function to save some
1099 * If there are not key and action attrs, we return 0
1100 * directly. In the case, the caller will also not use the
1101 * match as before. If there is action attr, we try to get
1102 * actions and save them to *acts. Before returning from
1103 * the function, we reset the match->mask pointer. Because
1104 * we should not to return match object with dangling reference
1107 static int ovs_nla_init_match_and_action(struct net *net,
1108 struct sw_flow_match *match,
1109 struct sw_flow_key *key,
1111 struct sw_flow_actions **acts,
1114 struct sw_flow_mask mask;
1117 if (a[OVS_FLOW_ATTR_KEY]) {
1118 ovs_match_init(match, key, true, &mask);
1119 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1120 a[OVS_FLOW_ATTR_MASK], log);
1125 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1126 if (!a[OVS_FLOW_ATTR_KEY]) {
1128 "Flow key attribute not present in set flow.");
1132 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1134 if (IS_ERR(*acts)) {
1135 error = PTR_ERR(*acts);
1140 /* On success, error is 0. */
1146 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1148 struct net *net = sock_net(skb->sk);
1149 struct nlattr **a = info->attrs;
1150 struct ovs_header *ovs_header = info->userhdr;
1151 struct sw_flow_key key;
1152 struct sw_flow *flow;
1153 struct sk_buff *reply = NULL;
1154 struct datapath *dp;
1155 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1156 struct sw_flow_match match;
1157 struct sw_flow_id sfid;
1158 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1160 bool log = !a[OVS_FLOW_ATTR_PROBE];
1163 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1164 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1166 "Flow set message rejected, Key attribute missing.");
1170 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1176 /* Can allocate before locking if have acts. */
1177 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1179 if (IS_ERR(reply)) {
1180 error = PTR_ERR(reply);
1181 goto err_kfree_acts;
1186 dp = get_dp(net, ovs_header->dp_ifindex);
1187 if (unlikely(!dp)) {
1189 goto err_unlock_ovs;
1191 /* Check that the flow exists. */
1193 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1195 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1196 if (unlikely(!flow)) {
1198 goto err_unlock_ovs;
1201 /* Update actions, if present. */
1203 old_acts = ovsl_dereference(flow->sf_acts);
1204 rcu_assign_pointer(flow->sf_acts, acts);
1206 if (unlikely(reply)) {
1207 error = ovs_flow_cmd_fill_info(flow,
1208 ovs_header->dp_ifindex,
1209 reply, info->snd_portid,
1216 /* Could not alloc without acts before locking. */
1217 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1218 info, OVS_FLOW_CMD_NEW, false,
1221 if (IS_ERR(reply)) {
1222 error = PTR_ERR(reply);
1223 goto err_unlock_ovs;
1228 if (a[OVS_FLOW_ATTR_CLEAR])
1229 ovs_flow_stats_clear(flow);
1233 ovs_notify(&dp_flow_genl_family, reply, info);
1235 ovs_nla_free_flow_actions_rcu(old_acts);
1243 ovs_nla_free_flow_actions(acts);
1248 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1250 struct nlattr **a = info->attrs;
1251 struct ovs_header *ovs_header = info->userhdr;
1252 struct net *net = sock_net(skb->sk);
1253 struct sw_flow_key key;
1254 struct sk_buff *reply;
1255 struct sw_flow *flow;
1256 struct datapath *dp;
1257 struct sw_flow_match match;
1258 struct sw_flow_id ufid;
1259 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1261 bool log = !a[OVS_FLOW_ATTR_PROBE];
1264 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1265 if (a[OVS_FLOW_ATTR_KEY]) {
1266 ovs_match_init(&match, &key, true, NULL);
1267 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1269 } else if (!ufid_present) {
1271 "Flow get message rejected, Key attribute missing.");
1278 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1285 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1287 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1293 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1294 OVS_FLOW_CMD_NEW, true, ufid_flags);
1295 if (IS_ERR(reply)) {
1296 err = PTR_ERR(reply);
1301 return genlmsg_reply(reply, info);
1307 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1309 struct nlattr **a = info->attrs;
1310 struct ovs_header *ovs_header = info->userhdr;
1311 struct net *net = sock_net(skb->sk);
1312 struct sw_flow_key key;
1313 struct sk_buff *reply;
1314 struct sw_flow *flow = NULL;
1315 struct datapath *dp;
1316 struct sw_flow_match match;
1317 struct sw_flow_id ufid;
1318 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1320 bool log = !a[OVS_FLOW_ATTR_PROBE];
1323 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1324 if (a[OVS_FLOW_ATTR_KEY]) {
1325 ovs_match_init(&match, &key, true, NULL);
1326 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1333 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1334 if (unlikely(!dp)) {
1339 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1340 err = ovs_flow_tbl_flush(&dp->table);
1345 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1347 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1348 if (unlikely(!flow)) {
1353 ovs_flow_tbl_remove(&dp->table, flow);
1356 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1357 &flow->id, info, false, ufid_flags);
1358 if (likely(reply)) {
1359 if (likely(!IS_ERR(reply))) {
1360 rcu_read_lock(); /*To keep RCU checker happy. */
1361 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1362 reply, info->snd_portid,
1369 ovs_notify(&dp_flow_genl_family, reply, info);
1371 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1375 ovs_flow_free(flow, true);
1382 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1384 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1385 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1386 struct table_instance *ti;
1387 struct datapath *dp;
1391 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1392 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1395 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1398 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1404 ti = rcu_dereference(dp->table.ti);
1406 struct sw_flow *flow;
1409 bucket = cb->args[0];
1411 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1415 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1416 NETLINK_CB(cb->skb).portid,
1417 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1418 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1421 cb->args[0] = bucket;
1428 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1429 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1430 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1431 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1432 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1433 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1434 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1435 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1438 static const struct genl_ops dp_flow_genl_ops[] = {
1439 { .cmd = OVS_FLOW_CMD_NEW,
1440 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1441 .policy = flow_policy,
1442 .doit = ovs_flow_cmd_new
1444 { .cmd = OVS_FLOW_CMD_DEL,
1445 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1446 .policy = flow_policy,
1447 .doit = ovs_flow_cmd_del
1449 { .cmd = OVS_FLOW_CMD_GET,
1450 .flags = 0, /* OK for unprivileged users. */
1451 .policy = flow_policy,
1452 .doit = ovs_flow_cmd_get,
1453 .dumpit = ovs_flow_cmd_dump
1455 { .cmd = OVS_FLOW_CMD_SET,
1456 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1457 .policy = flow_policy,
1458 .doit = ovs_flow_cmd_set,
1462 static struct genl_family dp_flow_genl_family __ro_after_init = {
1463 .hdrsize = sizeof(struct ovs_header),
1464 .name = OVS_FLOW_FAMILY,
1465 .version = OVS_FLOW_VERSION,
1466 .maxattr = OVS_FLOW_ATTR_MAX,
1468 .parallel_ops = true,
1469 .ops = dp_flow_genl_ops,
1470 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1471 .mcgrps = &ovs_dp_flow_multicast_group,
1473 .module = THIS_MODULE,
1476 static size_t ovs_dp_cmd_msg_size(void)
1478 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1480 msgsize += nla_total_size(IFNAMSIZ);
1481 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1482 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1483 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1488 /* Called with ovs_mutex. */
1489 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1490 u32 portid, u32 seq, u32 flags, u8 cmd)
1492 struct ovs_header *ovs_header;
1493 struct ovs_dp_stats dp_stats;
1494 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1497 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1502 ovs_header->dp_ifindex = get_dpifindex(dp);
1504 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1506 goto nla_put_failure;
1508 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1509 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1510 &dp_stats, OVS_DP_ATTR_PAD))
1511 goto nla_put_failure;
1513 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1514 sizeof(struct ovs_dp_megaflow_stats),
1515 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1516 goto nla_put_failure;
1518 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1519 goto nla_put_failure;
1521 genlmsg_end(skb, ovs_header);
1525 genlmsg_cancel(skb, ovs_header);
1530 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1532 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1535 /* Called with rcu_read_lock or ovs_mutex. */
1536 static struct datapath *lookup_datapath(struct net *net,
1537 const struct ovs_header *ovs_header,
1538 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1540 struct datapath *dp;
1542 if (!a[OVS_DP_ATTR_NAME])
1543 dp = get_dp(net, ovs_header->dp_ifindex);
1545 struct vport *vport;
1547 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1548 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1550 return dp ? dp : ERR_PTR(-ENODEV);
1553 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1555 struct datapath *dp;
1557 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1561 WARN(dp->user_features, "Dropping previously announced user features\n");
1562 dp->user_features = 0;
1565 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1567 if (a[OVS_DP_ATTR_USER_FEATURES])
1568 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1571 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1573 struct nlattr **a = info->attrs;
1574 struct vport_parms parms;
1575 struct sk_buff *reply;
1576 struct datapath *dp;
1577 struct vport *vport;
1578 struct ovs_net *ovs_net;
1582 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1585 reply = ovs_dp_cmd_alloc_info();
1590 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1592 goto err_free_reply;
1594 ovs_dp_set_net(dp, sock_net(skb->sk));
1596 /* Allocate table. */
1597 err = ovs_flow_tbl_init(&dp->table);
1601 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1602 if (!dp->stats_percpu) {
1604 goto err_destroy_table;
1607 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1611 goto err_destroy_percpu;
1614 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1615 INIT_HLIST_HEAD(&dp->ports[i]);
1617 /* Set up our datapath device. */
1618 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1619 parms.type = OVS_VPORT_TYPE_INTERNAL;
1620 parms.options = NULL;
1622 parms.port_no = OVSP_LOCAL;
1623 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1625 ovs_dp_change(dp, a);
1627 /* So far only local changes have been made, now need the lock. */
1630 vport = new_vport(&parms);
1631 if (IS_ERR(vport)) {
1632 err = PTR_ERR(vport);
1636 if (err == -EEXIST) {
1637 /* An outdated user space instance that does not understand
1638 * the concept of user_features has attempted to create a new
1639 * datapath and is likely to reuse it. Drop all user features.
1641 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1642 ovs_dp_reset_user_features(skb, info);
1645 goto err_destroy_ports_array;
1648 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1649 info->snd_seq, 0, OVS_DP_CMD_NEW);
1652 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1653 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1657 ovs_notify(&dp_datapath_genl_family, reply, info);
1660 err_destroy_ports_array:
1664 free_percpu(dp->stats_percpu);
1666 ovs_flow_tbl_destroy(&dp->table);
1675 /* Called with ovs_mutex. */
1676 static void __dp_destroy(struct datapath *dp)
1680 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1681 struct vport *vport;
1682 struct hlist_node *n;
1684 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1685 if (vport->port_no != OVSP_LOCAL)
1686 ovs_dp_detach_port(vport);
1689 list_del_rcu(&dp->list_node);
1691 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1692 * all ports in datapath are destroyed first before freeing datapath.
1694 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1696 /* RCU destroy the flow table */
1697 call_rcu(&dp->rcu, destroy_dp_rcu);
1700 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1702 struct sk_buff *reply;
1703 struct datapath *dp;
1706 reply = ovs_dp_cmd_alloc_info();
1711 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1714 goto err_unlock_free;
1716 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1717 info->snd_seq, 0, OVS_DP_CMD_DEL);
1723 ovs_notify(&dp_datapath_genl_family, reply, info);
1733 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1735 struct sk_buff *reply;
1736 struct datapath *dp;
1739 reply = ovs_dp_cmd_alloc_info();
1744 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1747 goto err_unlock_free;
1749 ovs_dp_change(dp, info->attrs);
1751 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1752 info->snd_seq, 0, OVS_DP_CMD_NEW);
1756 ovs_notify(&dp_datapath_genl_family, reply, info);
1766 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1768 struct sk_buff *reply;
1769 struct datapath *dp;
1772 reply = ovs_dp_cmd_alloc_info();
1777 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1780 goto err_unlock_free;
1782 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1783 info->snd_seq, 0, OVS_DP_CMD_NEW);
1787 return genlmsg_reply(reply, info);
1795 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1797 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1798 struct datapath *dp;
1799 int skip = cb->args[0];
1803 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1805 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1806 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1807 OVS_DP_CMD_NEW) < 0)
1818 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1819 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1820 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1821 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1824 static const struct genl_ops dp_datapath_genl_ops[] = {
1825 { .cmd = OVS_DP_CMD_NEW,
1826 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1827 .policy = datapath_policy,
1828 .doit = ovs_dp_cmd_new
1830 { .cmd = OVS_DP_CMD_DEL,
1831 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1832 .policy = datapath_policy,
1833 .doit = ovs_dp_cmd_del
1835 { .cmd = OVS_DP_CMD_GET,
1836 .flags = 0, /* OK for unprivileged users. */
1837 .policy = datapath_policy,
1838 .doit = ovs_dp_cmd_get,
1839 .dumpit = ovs_dp_cmd_dump
1841 { .cmd = OVS_DP_CMD_SET,
1842 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1843 .policy = datapath_policy,
1844 .doit = ovs_dp_cmd_set,
1848 static struct genl_family dp_datapath_genl_family __ro_after_init = {
1849 .hdrsize = sizeof(struct ovs_header),
1850 .name = OVS_DATAPATH_FAMILY,
1851 .version = OVS_DATAPATH_VERSION,
1852 .maxattr = OVS_DP_ATTR_MAX,
1854 .parallel_ops = true,
1855 .ops = dp_datapath_genl_ops,
1856 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1857 .mcgrps = &ovs_dp_datapath_multicast_group,
1859 .module = THIS_MODULE,
1862 /* Called with ovs_mutex or RCU read lock. */
1863 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1864 u32 portid, u32 seq, u32 flags, u8 cmd)
1866 struct ovs_header *ovs_header;
1867 struct ovs_vport_stats vport_stats;
1870 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1875 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1877 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1878 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1879 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1880 ovs_vport_name(vport)))
1881 goto nla_put_failure;
1883 ovs_vport_get_stats(vport, &vport_stats);
1884 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1885 sizeof(struct ovs_vport_stats), &vport_stats,
1886 OVS_VPORT_ATTR_PAD))
1887 goto nla_put_failure;
1889 if (ovs_vport_get_upcall_portids(vport, skb))
1890 goto nla_put_failure;
1892 err = ovs_vport_get_options(vport, skb);
1893 if (err == -EMSGSIZE)
1896 genlmsg_end(skb, ovs_header);
1902 genlmsg_cancel(skb, ovs_header);
1906 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1908 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1911 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1912 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1915 struct sk_buff *skb;
1918 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1920 return ERR_PTR(-ENOMEM);
1922 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1928 /* Called with ovs_mutex or RCU read lock. */
1929 static struct vport *lookup_vport(struct net *net,
1930 const struct ovs_header *ovs_header,
1931 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1933 struct datapath *dp;
1934 struct vport *vport;
1936 if (a[OVS_VPORT_ATTR_NAME]) {
1937 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1939 return ERR_PTR(-ENODEV);
1940 if (ovs_header->dp_ifindex &&
1941 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1942 return ERR_PTR(-ENODEV);
1944 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1945 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1947 if (port_no >= DP_MAX_PORTS)
1948 return ERR_PTR(-EFBIG);
1950 dp = get_dp(net, ovs_header->dp_ifindex);
1952 return ERR_PTR(-ENODEV);
1954 vport = ovs_vport_ovsl_rcu(dp, port_no);
1956 return ERR_PTR(-ENODEV);
1959 return ERR_PTR(-EINVAL);
1962 /* Called with ovs_mutex */
1963 static void update_headroom(struct datapath *dp)
1965 unsigned dev_headroom, max_headroom = 0;
1966 struct net_device *dev;
1967 struct vport *vport;
1970 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1971 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1973 dev_headroom = netdev_get_fwd_headroom(dev);
1974 if (dev_headroom > max_headroom)
1975 max_headroom = dev_headroom;
1979 dp->max_headroom = max_headroom;
1980 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1981 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1982 netdev_set_rx_headroom(vport->dev, max_headroom);
1985 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1987 struct nlattr **a = info->attrs;
1988 struct ovs_header *ovs_header = info->userhdr;
1989 struct vport_parms parms;
1990 struct sk_buff *reply;
1991 struct vport *vport;
1992 struct datapath *dp;
1996 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1997 !a[OVS_VPORT_ATTR_UPCALL_PID])
2000 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2001 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2002 if (port_no >= DP_MAX_PORTS)
2005 reply = ovs_vport_cmd_alloc_info();
2011 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2014 goto exit_unlock_free;
2017 vport = ovs_vport_ovsl(dp, port_no);
2020 goto exit_unlock_free;
2022 for (port_no = 1; ; port_no++) {
2023 if (port_no >= DP_MAX_PORTS) {
2025 goto exit_unlock_free;
2027 vport = ovs_vport_ovsl(dp, port_no);
2033 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2034 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2035 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2037 parms.port_no = port_no;
2038 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2040 vport = new_vport(&parms);
2041 err = PTR_ERR(vport);
2042 if (IS_ERR(vport)) {
2045 goto exit_unlock_free;
2048 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2049 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2051 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2052 update_headroom(dp);
2054 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2059 ovs_notify(&dp_vport_genl_family, reply, info);
2068 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2070 struct nlattr **a = info->attrs;
2071 struct sk_buff *reply;
2072 struct vport *vport;
2075 reply = ovs_vport_cmd_alloc_info();
2080 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2081 err = PTR_ERR(vport);
2083 goto exit_unlock_free;
2085 if (a[OVS_VPORT_ATTR_TYPE] &&
2086 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2088 goto exit_unlock_free;
2091 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2092 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2094 goto exit_unlock_free;
2098 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2099 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2101 err = ovs_vport_set_upcall_portids(vport, ids);
2103 goto exit_unlock_free;
2106 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2107 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2111 ovs_notify(&dp_vport_genl_family, reply, info);
2120 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2122 bool must_update_headroom = false;
2123 struct nlattr **a = info->attrs;
2124 struct sk_buff *reply;
2125 struct datapath *dp;
2126 struct vport *vport;
2129 reply = ovs_vport_cmd_alloc_info();
2134 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2135 err = PTR_ERR(vport);
2137 goto exit_unlock_free;
2139 if (vport->port_no == OVSP_LOCAL) {
2141 goto exit_unlock_free;
2144 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2145 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2148 /* the vport deletion may trigger dp headroom update */
2150 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2151 must_update_headroom = true;
2152 netdev_reset_rx_headroom(vport->dev);
2153 ovs_dp_detach_port(vport);
2155 if (must_update_headroom)
2156 update_headroom(dp);
2159 ovs_notify(&dp_vport_genl_family, reply, info);
2168 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2170 struct nlattr **a = info->attrs;
2171 struct ovs_header *ovs_header = info->userhdr;
2172 struct sk_buff *reply;
2173 struct vport *vport;
2176 reply = ovs_vport_cmd_alloc_info();
2181 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2182 err = PTR_ERR(vport);
2184 goto exit_unlock_free;
2185 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2186 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2190 return genlmsg_reply(reply, info);
2198 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2200 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2201 struct datapath *dp;
2202 int bucket = cb->args[0], skip = cb->args[1];
2206 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2211 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2212 struct vport *vport;
2215 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2217 ovs_vport_cmd_fill_info(vport, skb,
2218 NETLINK_CB(cb->skb).portid,
2221 OVS_VPORT_CMD_NEW) < 0)
2237 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2238 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2239 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2240 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2241 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2242 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2243 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2246 static const struct genl_ops dp_vport_genl_ops[] = {
2247 { .cmd = OVS_VPORT_CMD_NEW,
2248 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2249 .policy = vport_policy,
2250 .doit = ovs_vport_cmd_new
2252 { .cmd = OVS_VPORT_CMD_DEL,
2253 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2254 .policy = vport_policy,
2255 .doit = ovs_vport_cmd_del
2257 { .cmd = OVS_VPORT_CMD_GET,
2258 .flags = 0, /* OK for unprivileged users. */
2259 .policy = vport_policy,
2260 .doit = ovs_vport_cmd_get,
2261 .dumpit = ovs_vport_cmd_dump
2263 { .cmd = OVS_VPORT_CMD_SET,
2264 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2265 .policy = vport_policy,
2266 .doit = ovs_vport_cmd_set,
2270 struct genl_family dp_vport_genl_family __ro_after_init = {
2271 .hdrsize = sizeof(struct ovs_header),
2272 .name = OVS_VPORT_FAMILY,
2273 .version = OVS_VPORT_VERSION,
2274 .maxattr = OVS_VPORT_ATTR_MAX,
2276 .parallel_ops = true,
2277 .ops = dp_vport_genl_ops,
2278 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2279 .mcgrps = &ovs_dp_vport_multicast_group,
2281 .module = THIS_MODULE,
2284 static struct genl_family * const dp_genl_families[] = {
2285 &dp_datapath_genl_family,
2286 &dp_vport_genl_family,
2287 &dp_flow_genl_family,
2288 &dp_packet_genl_family,
2291 static void dp_unregister_genl(int n_families)
2295 for (i = 0; i < n_families; i++)
2296 genl_unregister_family(dp_genl_families[i]);
2299 static int __init dp_register_genl(void)
2304 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2306 err = genl_register_family(dp_genl_families[i]);
2314 dp_unregister_genl(i);
2318 static int __net_init ovs_init_net(struct net *net)
2320 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2322 INIT_LIST_HEAD(&ovs_net->dps);
2323 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2328 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2329 struct list_head *head)
2331 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2332 struct datapath *dp;
2334 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2337 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2338 struct vport *vport;
2340 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2341 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2344 if (dev_net(vport->dev) == dnet)
2345 list_add(&vport->detach_list, head);
2351 static void __net_exit ovs_exit_net(struct net *dnet)
2353 struct datapath *dp, *dp_next;
2354 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2355 struct vport *vport, *vport_next;
2361 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2366 list_vports_from_net(net, dnet, &head);
2369 /* Detach all vports from given namespace. */
2370 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2371 list_del(&vport->detach_list);
2372 ovs_dp_detach_port(vport);
2377 cancel_work_sync(&ovs_net->dp_notify_work);
2380 static struct pernet_operations ovs_net_ops = {
2381 .init = ovs_init_net,
2382 .exit = ovs_exit_net,
2384 .size = sizeof(struct ovs_net),
2387 static int __init dp_init(void)
2391 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2393 pr_info("Open vSwitch switching datapath\n");
2395 err = action_fifos_init();
2399 err = ovs_internal_dev_rtnl_link_register();
2401 goto error_action_fifos_exit;
2403 err = ovs_flow_init();
2405 goto error_unreg_rtnl_link;
2407 err = ovs_vport_init();
2409 goto error_flow_exit;
2411 err = register_pernet_device(&ovs_net_ops);
2413 goto error_vport_exit;
2415 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2417 goto error_netns_exit;
2419 err = ovs_netdev_init();
2421 goto error_unreg_notifier;
2423 err = dp_register_genl();
2425 goto error_unreg_netdev;
2431 error_unreg_notifier:
2432 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2434 unregister_pernet_device(&ovs_net_ops);
2439 error_unreg_rtnl_link:
2440 ovs_internal_dev_rtnl_link_unregister();
2441 error_action_fifos_exit:
2442 action_fifos_exit();
2447 static void dp_cleanup(void)
2449 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2451 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2452 unregister_pernet_device(&ovs_net_ops);
2456 ovs_internal_dev_rtnl_link_unregister();
2457 action_fifos_exit();
2460 module_init(dp_init);
2461 module_exit(dp_cleanup);
2463 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2464 MODULE_LICENSE("GPL");
2465 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2466 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2467 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2468 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);