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Linux/net/openvswitch/datapath.c

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  1 /*
  2  * Copyright (c) 2007-2014 Nicira, Inc.
  3  *
  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.
  7  *
  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.
 12  *
 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
 16  * 02110-1301, USA
 17  */
 18 
 19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 20 
 21 #include <linux/init.h>
 22 #include <linux/module.h>
 23 #include <linux/if_arp.h>
 24 #include <linux/if_vlan.h>
 25 #include <linux/in.h>
 26 #include <linux/ip.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>
 53 
 54 #include "datapath.h"
 55 #include "flow.h"
 56 #include "flow_table.h"
 57 #include "flow_netlink.h"
 58 #include "vport-internal_dev.h"
 59 #include "vport-netdev.h"
 60 
 61 int ovs_net_id __read_mostly;
 62 EXPORT_SYMBOL_GPL(ovs_net_id);
 63 
 64 static struct genl_family dp_packet_genl_family;
 65 static struct genl_family dp_flow_genl_family;
 66 static struct genl_family dp_datapath_genl_family;
 67 
 68 static const struct nla_policy flow_policy[];
 69 
 70 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
 71         .name = OVS_FLOW_MCGROUP,
 72 };
 73 
 74 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
 75         .name = OVS_DATAPATH_MCGROUP,
 76 };
 77 
 78 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
 79         .name = OVS_VPORT_MCGROUP,
 80 };
 81 
 82 /* Check if need to build a reply message.
 83  * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
 84 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
 85                             unsigned int group)
 86 {
 87         return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
 88                genl_has_listeners(family, genl_info_net(info), group);
 89 }
 90 
 91 static void ovs_notify(struct genl_family *family,
 92                        struct sk_buff *skb, struct genl_info *info)
 93 {
 94         genl_notify(family, skb, info, 0, GFP_KERNEL);
 95 }
 96 
 97 /**
 98  * DOC: Locking:
 99  *
100  * All writes e.g. Writes to device state (add/remove datapath, port, set
101  * operations on vports, etc.), Writes to other state (flow table
102  * modifications, set miscellaneous datapath parameters, etc.) are protected
103  * by ovs_lock.
104  *
105  * Reads are protected by RCU.
106  *
107  * There are a few special cases (mostly stats) that have their own
108  * synchronization but they nest under all of above and don't interact with
109  * each other.
110  *
111  * The RTNL lock nests inside ovs_mutex.
112  */
113 
114 static DEFINE_MUTEX(ovs_mutex);
115 
116 void ovs_lock(void)
117 {
118         mutex_lock(&ovs_mutex);
119 }
120 
121 void ovs_unlock(void)
122 {
123         mutex_unlock(&ovs_mutex);
124 }
125 
126 #ifdef CONFIG_LOCKDEP
127 int lockdep_ovsl_is_held(void)
128 {
129         if (debug_locks)
130                 return lockdep_is_held(&ovs_mutex);
131         else
132                 return 1;
133 }
134 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
135 #endif
136 
137 static struct vport *new_vport(const struct vport_parms *);
138 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
139                              const struct sw_flow_key *,
140                              const struct dp_upcall_info *);
141 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
142                                   const struct sw_flow_key *,
143                                   const struct dp_upcall_info *);
144 
145 /* Must be called with rcu_read_lock. */
146 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
147 {
148         struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
149 
150         if (dev) {
151                 struct vport *vport = ovs_internal_dev_get_vport(dev);
152                 if (vport)
153                         return vport->dp;
154         }
155 
156         return NULL;
157 }
158 
159 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
160  * returned dp pointer valid.
161  */
162 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
163 {
164         struct datapath *dp;
165 
166         WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
167         rcu_read_lock();
168         dp = get_dp_rcu(net, dp_ifindex);
169         rcu_read_unlock();
170 
171         return dp;
172 }
173 
174 /* Must be called with rcu_read_lock or ovs_mutex. */
175 const char *ovs_dp_name(const struct datapath *dp)
176 {
177         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
178         return ovs_vport_name(vport);
179 }
180 
181 static int get_dpifindex(const struct datapath *dp)
182 {
183         struct vport *local;
184         int ifindex;
185 
186         rcu_read_lock();
187 
188         local = ovs_vport_rcu(dp, OVSP_LOCAL);
189         if (local)
190                 ifindex = local->dev->ifindex;
191         else
192                 ifindex = 0;
193 
194         rcu_read_unlock();
195 
196         return ifindex;
197 }
198 
199 static void destroy_dp_rcu(struct rcu_head *rcu)
200 {
201         struct datapath *dp = container_of(rcu, struct datapath, rcu);
202 
203         ovs_flow_tbl_destroy(&dp->table);
204         free_percpu(dp->stats_percpu);
205         kfree(dp->ports);
206         kfree(dp);
207 }
208 
209 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
210                                             u16 port_no)
211 {
212         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
213 }
214 
215 /* Called with ovs_mutex or RCU read lock. */
216 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
217 {
218         struct vport *vport;
219         struct hlist_head *head;
220 
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)
224                         return vport;
225         }
226         return NULL;
227 }
228 
229 /* Called with ovs_mutex. */
230 static struct vport *new_vport(const struct vport_parms *parms)
231 {
232         struct vport *vport;
233 
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);
238 
239                 hlist_add_head_rcu(&vport->dp_hash_node, head);
240         }
241         return vport;
242 }
243 
244 void ovs_dp_detach_port(struct vport *p)
245 {
246         ASSERT_OVSL();
247 
248         /* First drop references to device. */
249         hlist_del_rcu(&p->dp_hash_node);
250 
251         /* Then destroy it. */
252         ovs_vport_del(p);
253 }
254 
255 /* Must be called with rcu_read_lock. */
256 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
257 {
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;
263         u64 *stats_counter;
264         u32 n_mask_hit;
265 
266         stats = this_cpu_ptr(dp->stats_percpu);
267 
268         /* Look up flow. */
269         flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
270         if (unlikely(!flow)) {
271                 struct dp_upcall_info upcall;
272                 int error;
273 
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);
279                 if (unlikely(error))
280                         kfree_skb(skb);
281                 else
282                         consume_skb(skb);
283                 stats_counter = &stats->n_missed;
284                 goto out;
285         }
286 
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);
290 
291         stats_counter = &stats->n_hit;
292 
293 out:
294         /* Update datapath statistics. */
295         u64_stats_update_begin(&stats->syncp);
296         (*stats_counter)++;
297         stats->n_mask_hit += n_mask_hit;
298         u64_stats_update_end(&stats->syncp);
299 }
300 
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)
304 {
305         struct dp_stats_percpu *stats;
306         int err;
307 
308         if (upcall_info->portid == 0) {
309                 err = -ENOTCONN;
310                 goto err;
311         }
312 
313         if (!skb_is_gso(skb))
314                 err = queue_userspace_packet(dp, skb, key, upcall_info);
315         else
316                 err = queue_gso_packets(dp, skb, key, upcall_info);
317         if (err)
318                 goto err;
319 
320         return 0;
321 
322 err:
323         stats = this_cpu_ptr(dp->stats_percpu);
324 
325         u64_stats_update_begin(&stats->syncp);
326         stats->n_lost++;
327         u64_stats_update_end(&stats->syncp);
328 
329         return err;
330 }
331 
332 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
333                              const struct sw_flow_key *key,
334                              const struct dp_upcall_info *upcall_info)
335 {
336         unsigned short gso_type = skb_shinfo(skb)->gso_type;
337         struct sw_flow_key later_key;
338         struct sk_buff *segs, *nskb;
339         int err;
340 
341         BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
342         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
343         if (IS_ERR(segs))
344                 return PTR_ERR(segs);
345         if (segs == NULL)
346                 return -EINVAL;
347 
348         if (gso_type & SKB_GSO_UDP) {
349                 /* The initial flow key extracted by ovs_flow_key_extract()
350                  * in this case is for a first fragment, so we need to
351                  * properly mark later fragments.
352                  */
353                 later_key = *key;
354                 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
355         }
356 
357         /* Queue all of the segments. */
358         skb = segs;
359         do {
360                 if (gso_type & SKB_GSO_UDP && skb != segs)
361                         key = &later_key;
362 
363                 err = queue_userspace_packet(dp, skb, key, upcall_info);
364                 if (err)
365                         break;
366 
367         } while ((skb = skb->next));
368 
369         /* Free all of the segments. */
370         skb = segs;
371         do {
372                 nskb = skb->next;
373                 if (err)
374                         kfree_skb(skb);
375                 else
376                         consume_skb(skb);
377         } while ((skb = nskb));
378         return err;
379 }
380 
381 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
382                               unsigned int hdrlen)
383 {
384         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
385                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
386                 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */
387 
388         /* OVS_PACKET_ATTR_USERDATA */
389         if (upcall_info->userdata)
390                 size += NLA_ALIGN(upcall_info->userdata->nla_len);
391 
392         /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
393         if (upcall_info->egress_tun_info)
394                 size += nla_total_size(ovs_tun_key_attr_size());
395 
396         /* OVS_PACKET_ATTR_ACTIONS */
397         if (upcall_info->actions_len)
398                 size += nla_total_size(upcall_info->actions_len);
399 
400         /* OVS_PACKET_ATTR_MRU */
401         if (upcall_info->mru)
402                 size += nla_total_size(sizeof(upcall_info->mru));
403 
404         return size;
405 }
406 
407 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
408 {
409         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
410                 size_t plen = NLA_ALIGN(skb->len) - skb->len;
411 
412                 if (plen > 0)
413                         memset(skb_put(skb, plen), 0, plen);
414         }
415 }
416 
417 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
418                                   const struct sw_flow_key *key,
419                                   const struct dp_upcall_info *upcall_info)
420 {
421         struct ovs_header *upcall;
422         struct sk_buff *nskb = NULL;
423         struct sk_buff *user_skb = NULL; /* to be queued to userspace */
424         struct nlattr *nla;
425         size_t len;
426         unsigned int hlen;
427         int err, dp_ifindex;
428 
429         dp_ifindex = get_dpifindex(dp);
430         if (!dp_ifindex)
431                 return -ENODEV;
432 
433         if (skb_vlan_tag_present(skb)) {
434                 nskb = skb_clone(skb, GFP_ATOMIC);
435                 if (!nskb)
436                         return -ENOMEM;
437 
438                 nskb = __vlan_hwaccel_push_inside(nskb);
439                 if (!nskb)
440                         return -ENOMEM;
441 
442                 skb = nskb;
443         }
444 
445         if (nla_attr_size(skb->len) > USHRT_MAX) {
446                 err = -EFBIG;
447                 goto out;
448         }
449 
450         /* Complete checksum if needed */
451         if (skb->ip_summed == CHECKSUM_PARTIAL &&
452             (err = skb_checksum_help(skb)))
453                 goto out;
454 
455         /* Older versions of OVS user space enforce alignment of the last
456          * Netlink attribute to NLA_ALIGNTO which would require extensive
457          * padding logic. Only perform zerocopy if padding is not required.
458          */
459         if (dp->user_features & OVS_DP_F_UNALIGNED)
460                 hlen = skb_zerocopy_headlen(skb);
461         else
462                 hlen = skb->len;
463 
464         len = upcall_msg_size(upcall_info, hlen);
465         user_skb = genlmsg_new(len, GFP_ATOMIC);
466         if (!user_skb) {
467                 err = -ENOMEM;
468                 goto out;
469         }
470 
471         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
472                              0, upcall_info->cmd);
473         upcall->dp_ifindex = dp_ifindex;
474 
475         err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
476         BUG_ON(err);
477 
478         if (upcall_info->userdata)
479                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
480                           nla_len(upcall_info->userdata),
481                           nla_data(upcall_info->userdata));
482 
483         if (upcall_info->egress_tun_info) {
484                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
485                 err = ovs_nla_put_tunnel_info(user_skb,
486                                               upcall_info->egress_tun_info);
487                 BUG_ON(err);
488                 nla_nest_end(user_skb, nla);
489         }
490 
491         if (upcall_info->actions_len) {
492                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
493                 err = ovs_nla_put_actions(upcall_info->actions,
494                                           upcall_info->actions_len,
495                                           user_skb);
496                 if (!err)
497                         nla_nest_end(user_skb, nla);
498                 else
499                         nla_nest_cancel(user_skb, nla);
500         }
501 
502         /* Add OVS_PACKET_ATTR_MRU */
503         if (upcall_info->mru) {
504                 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
505                                 upcall_info->mru)) {
506                         err = -ENOBUFS;
507                         goto out;
508                 }
509                 pad_packet(dp, user_skb);
510         }
511 
512         /* Only reserve room for attribute header, packet data is added
513          * in skb_zerocopy() */
514         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
515                 err = -ENOBUFS;
516                 goto out;
517         }
518         nla->nla_len = nla_attr_size(skb->len);
519 
520         err = skb_zerocopy(user_skb, skb, skb->len, hlen);
521         if (err)
522                 goto out;
523 
524         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
525         pad_packet(dp, user_skb);
526 
527         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
528 
529         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
530         user_skb = NULL;
531 out:
532         if (err)
533                 skb_tx_error(skb);
534         kfree_skb(user_skb);
535         kfree_skb(nskb);
536         return err;
537 }
538 
539 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
540 {
541         struct ovs_header *ovs_header = info->userhdr;
542         struct net *net = sock_net(skb->sk);
543         struct nlattr **a = info->attrs;
544         struct sw_flow_actions *acts;
545         struct sk_buff *packet;
546         struct sw_flow *flow;
547         struct sw_flow_actions *sf_acts;
548         struct datapath *dp;
549         struct ethhdr *eth;
550         struct vport *input_vport;
551         u16 mru = 0;
552         int len;
553         int err;
554         bool log = !a[OVS_PACKET_ATTR_PROBE];
555 
556         err = -EINVAL;
557         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
558             !a[OVS_PACKET_ATTR_ACTIONS])
559                 goto err;
560 
561         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
562         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
563         err = -ENOMEM;
564         if (!packet)
565                 goto err;
566         skb_reserve(packet, NET_IP_ALIGN);
567 
568         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
569 
570         skb_reset_mac_header(packet);
571         eth = eth_hdr(packet);
572 
573         /* Normally, setting the skb 'protocol' field would be handled by a
574          * call to eth_type_trans(), but it assumes there's a sending
575          * device, which we may not have. */
576         if (eth_proto_is_802_3(eth->h_proto))
577                 packet->protocol = eth->h_proto;
578         else
579                 packet->protocol = htons(ETH_P_802_2);
580 
581         /* Set packet's mru */
582         if (a[OVS_PACKET_ATTR_MRU]) {
583                 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
584                 packet->ignore_df = 1;
585         }
586         OVS_CB(packet)->mru = mru;
587 
588         /* Build an sw_flow for sending this packet. */
589         flow = ovs_flow_alloc();
590         err = PTR_ERR(flow);
591         if (IS_ERR(flow))
592                 goto err_kfree_skb;
593 
594         err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
595                                              packet, &flow->key, log);
596         if (err)
597                 goto err_flow_free;
598 
599         err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
600                                    &flow->key, &acts, log);
601         if (err)
602                 goto err_flow_free;
603 
604         rcu_assign_pointer(flow->sf_acts, acts);
605         packet->priority = flow->key.phy.priority;
606         packet->mark = flow->key.phy.skb_mark;
607 
608         rcu_read_lock();
609         dp = get_dp_rcu(net, ovs_header->dp_ifindex);
610         err = -ENODEV;
611         if (!dp)
612                 goto err_unlock;
613 
614         input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
615         if (!input_vport)
616                 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
617 
618         if (!input_vport)
619                 goto err_unlock;
620 
621         packet->dev = input_vport->dev;
622         OVS_CB(packet)->input_vport = input_vport;
623         sf_acts = rcu_dereference(flow->sf_acts);
624 
625         local_bh_disable();
626         err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
627         local_bh_enable();
628         rcu_read_unlock();
629 
630         ovs_flow_free(flow, false);
631         return err;
632 
633 err_unlock:
634         rcu_read_unlock();
635 err_flow_free:
636         ovs_flow_free(flow, false);
637 err_kfree_skb:
638         kfree_skb(packet);
639 err:
640         return err;
641 }
642 
643 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
644         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
645         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
646         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
647         [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
648         [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
649 };
650 
651 static const struct genl_ops dp_packet_genl_ops[] = {
652         { .cmd = OVS_PACKET_CMD_EXECUTE,
653           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
654           .policy = packet_policy,
655           .doit = ovs_packet_cmd_execute
656         }
657 };
658 
659 static struct genl_family dp_packet_genl_family = {
660         .id = GENL_ID_GENERATE,
661         .hdrsize = sizeof(struct ovs_header),
662         .name = OVS_PACKET_FAMILY,
663         .version = OVS_PACKET_VERSION,
664         .maxattr = OVS_PACKET_ATTR_MAX,
665         .netnsok = true,
666         .parallel_ops = true,
667         .ops = dp_packet_genl_ops,
668         .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
669 };
670 
671 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
672                          struct ovs_dp_megaflow_stats *mega_stats)
673 {
674         int i;
675 
676         memset(mega_stats, 0, sizeof(*mega_stats));
677 
678         stats->n_flows = ovs_flow_tbl_count(&dp->table);
679         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
680 
681         stats->n_hit = stats->n_missed = stats->n_lost = 0;
682 
683         for_each_possible_cpu(i) {
684                 const struct dp_stats_percpu *percpu_stats;
685                 struct dp_stats_percpu local_stats;
686                 unsigned int start;
687 
688                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
689 
690                 do {
691                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
692                         local_stats = *percpu_stats;
693                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
694 
695                 stats->n_hit += local_stats.n_hit;
696                 stats->n_missed += local_stats.n_missed;
697                 stats->n_lost += local_stats.n_lost;
698                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
699         }
700 }
701 
702 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
703 {
704         return ovs_identifier_is_ufid(sfid) &&
705                !(ufid_flags & OVS_UFID_F_OMIT_KEY);
706 }
707 
708 static bool should_fill_mask(uint32_t ufid_flags)
709 {
710         return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
711 }
712 
713 static bool should_fill_actions(uint32_t ufid_flags)
714 {
715         return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
716 }
717 
718 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
719                                     const struct sw_flow_id *sfid,
720                                     uint32_t ufid_flags)
721 {
722         size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
723 
724         /* OVS_FLOW_ATTR_UFID */
725         if (sfid && ovs_identifier_is_ufid(sfid))
726                 len += nla_total_size(sfid->ufid_len);
727 
728         /* OVS_FLOW_ATTR_KEY */
729         if (!sfid || should_fill_key(sfid, ufid_flags))
730                 len += nla_total_size(ovs_key_attr_size());
731 
732         /* OVS_FLOW_ATTR_MASK */
733         if (should_fill_mask(ufid_flags))
734                 len += nla_total_size(ovs_key_attr_size());
735 
736         /* OVS_FLOW_ATTR_ACTIONS */
737         if (should_fill_actions(ufid_flags))
738                 len += nla_total_size(acts->orig_len);
739 
740         return len
741                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
742                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
743                 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */
744 }
745 
746 /* Called with ovs_mutex or RCU read lock. */
747 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
748                                    struct sk_buff *skb)
749 {
750         struct ovs_flow_stats stats;
751         __be16 tcp_flags;
752         unsigned long used;
753 
754         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
755 
756         if (used &&
757             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
758                 return -EMSGSIZE;
759 
760         if (stats.n_packets &&
761             nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
762                 return -EMSGSIZE;
763 
764         if ((u8)ntohs(tcp_flags) &&
765              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
766                 return -EMSGSIZE;
767 
768         return 0;
769 }
770 
771 /* Called with ovs_mutex or RCU read lock. */
772 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
773                                      struct sk_buff *skb, int skb_orig_len)
774 {
775         struct nlattr *start;
776         int err;
777 
778         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
779          * this is the first flow to be dumped into 'skb'.  This is unusual for
780          * Netlink but individual action lists can be longer than
781          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
782          * The userspace caller can always fetch the actions separately if it
783          * really wants them.  (Most userspace callers in fact don't care.)
784          *
785          * This can only fail for dump operations because the skb is always
786          * properly sized for single flows.
787          */
788         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
789         if (start) {
790                 const struct sw_flow_actions *sf_acts;
791 
792                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
793                 err = ovs_nla_put_actions(sf_acts->actions,
794                                           sf_acts->actions_len, skb);
795 
796                 if (!err)
797                         nla_nest_end(skb, start);
798                 else {
799                         if (skb_orig_len)
800                                 return err;
801 
802                         nla_nest_cancel(skb, start);
803                 }
804         } else if (skb_orig_len) {
805                 return -EMSGSIZE;
806         }
807 
808         return 0;
809 }
810 
811 /* Called with ovs_mutex or RCU read lock. */
812 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
813                                   struct sk_buff *skb, u32 portid,
814                                   u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
815 {
816         const int skb_orig_len = skb->len;
817         struct ovs_header *ovs_header;
818         int err;
819 
820         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
821                                  flags, cmd);
822         if (!ovs_header)
823                 return -EMSGSIZE;
824 
825         ovs_header->dp_ifindex = dp_ifindex;
826 
827         err = ovs_nla_put_identifier(flow, skb);
828         if (err)
829                 goto error;
830 
831         if (should_fill_key(&flow->id, ufid_flags)) {
832                 err = ovs_nla_put_masked_key(flow, skb);
833                 if (err)
834                         goto error;
835         }
836 
837         if (should_fill_mask(ufid_flags)) {
838                 err = ovs_nla_put_mask(flow, skb);
839                 if (err)
840                         goto error;
841         }
842 
843         err = ovs_flow_cmd_fill_stats(flow, skb);
844         if (err)
845                 goto error;
846 
847         if (should_fill_actions(ufid_flags)) {
848                 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
849                 if (err)
850                         goto error;
851         }
852 
853         genlmsg_end(skb, ovs_header);
854         return 0;
855 
856 error:
857         genlmsg_cancel(skb, ovs_header);
858         return err;
859 }
860 
861 /* May not be called with RCU read lock. */
862 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
863                                                const struct sw_flow_id *sfid,
864                                                struct genl_info *info,
865                                                bool always,
866                                                uint32_t ufid_flags)
867 {
868         struct sk_buff *skb;
869         size_t len;
870 
871         if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
872                 return NULL;
873 
874         len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
875         skb = genlmsg_new(len, GFP_KERNEL);
876         if (!skb)
877                 return ERR_PTR(-ENOMEM);
878 
879         return skb;
880 }
881 
882 /* Called with ovs_mutex. */
883 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
884                                                int dp_ifindex,
885                                                struct genl_info *info, u8 cmd,
886                                                bool always, u32 ufid_flags)
887 {
888         struct sk_buff *skb;
889         int retval;
890 
891         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
892                                       &flow->id, info, always, ufid_flags);
893         if (IS_ERR_OR_NULL(skb))
894                 return skb;
895 
896         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
897                                         info->snd_portid, info->snd_seq, 0,
898                                         cmd, ufid_flags);
899         BUG_ON(retval < 0);
900         return skb;
901 }
902 
903 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
904 {
905         struct net *net = sock_net(skb->sk);
906         struct nlattr **a = info->attrs;
907         struct ovs_header *ovs_header = info->userhdr;
908         struct sw_flow *flow = NULL, *new_flow;
909         struct sw_flow_mask mask;
910         struct sk_buff *reply;
911         struct datapath *dp;
912         struct sw_flow_key key;
913         struct sw_flow_actions *acts;
914         struct sw_flow_match match;
915         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
916         int error;
917         bool log = !a[OVS_FLOW_ATTR_PROBE];
918 
919         /* Must have key and actions. */
920         error = -EINVAL;
921         if (!a[OVS_FLOW_ATTR_KEY]) {
922                 OVS_NLERR(log, "Flow key attr not present in new flow.");
923                 goto error;
924         }
925         if (!a[OVS_FLOW_ATTR_ACTIONS]) {
926                 OVS_NLERR(log, "Flow actions attr not present in new flow.");
927                 goto error;
928         }
929 
930         /* Most of the time we need to allocate a new flow, do it before
931          * locking.
932          */
933         new_flow = ovs_flow_alloc();
934         if (IS_ERR(new_flow)) {
935                 error = PTR_ERR(new_flow);
936                 goto error;
937         }
938 
939         /* Extract key. */
940         ovs_match_init(&match, &key, &mask);
941         error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
942                                   a[OVS_FLOW_ATTR_MASK], log);
943         if (error)
944                 goto err_kfree_flow;
945 
946         ovs_flow_mask_key(&new_flow->key, &key, true, &mask);
947 
948         /* Extract flow identifier. */
949         error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
950                                        &key, log);
951         if (error)
952                 goto err_kfree_flow;
953 
954         /* Validate actions. */
955         error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
956                                      &new_flow->key, &acts, log);
957         if (error) {
958                 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
959                 goto err_kfree_flow;
960         }
961 
962         reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
963                                         ufid_flags);
964         if (IS_ERR(reply)) {
965                 error = PTR_ERR(reply);
966                 goto err_kfree_acts;
967         }
968 
969         ovs_lock();
970         dp = get_dp(net, ovs_header->dp_ifindex);
971         if (unlikely(!dp)) {
972                 error = -ENODEV;
973                 goto err_unlock_ovs;
974         }
975 
976         /* Check if this is a duplicate flow */
977         if (ovs_identifier_is_ufid(&new_flow->id))
978                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
979         if (!flow)
980                 flow = ovs_flow_tbl_lookup(&dp->table, &key);
981         if (likely(!flow)) {
982                 rcu_assign_pointer(new_flow->sf_acts, acts);
983 
984                 /* Put flow in bucket. */
985                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
986                 if (unlikely(error)) {
987                         acts = NULL;
988                         goto err_unlock_ovs;
989                 }
990 
991                 if (unlikely(reply)) {
992                         error = ovs_flow_cmd_fill_info(new_flow,
993                                                        ovs_header->dp_ifindex,
994                                                        reply, info->snd_portid,
995                                                        info->snd_seq, 0,
996                                                        OVS_FLOW_CMD_NEW,
997                                                        ufid_flags);
998                         BUG_ON(error < 0);
999                 }
1000                 ovs_unlock();
1001         } else {
1002                 struct sw_flow_actions *old_acts;
1003 
1004                 /* Bail out if we're not allowed to modify an existing flow.
1005                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1006                  * because Generic Netlink treats the latter as a dump
1007                  * request.  We also accept NLM_F_EXCL in case that bug ever
1008                  * gets fixed.
1009                  */
1010                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1011                                                          | NLM_F_EXCL))) {
1012                         error = -EEXIST;
1013                         goto err_unlock_ovs;
1014                 }
1015                 /* The flow identifier has to be the same for flow updates.
1016                  * Look for any overlapping flow.
1017                  */
1018                 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1019                         if (ovs_identifier_is_key(&flow->id))
1020                                 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1021                                                                  &match);
1022                         else /* UFID matches but key is different */
1023                                 flow = NULL;
1024                         if (!flow) {
1025                                 error = -ENOENT;
1026                                 goto err_unlock_ovs;
1027                         }
1028                 }
1029                 /* Update actions. */
1030                 old_acts = ovsl_dereference(flow->sf_acts);
1031                 rcu_assign_pointer(flow->sf_acts, acts);
1032 
1033                 if (unlikely(reply)) {
1034                         error = ovs_flow_cmd_fill_info(flow,
1035                                                        ovs_header->dp_ifindex,
1036                                                        reply, info->snd_portid,
1037                                                        info->snd_seq, 0,
1038                                                        OVS_FLOW_CMD_NEW,
1039                                                        ufid_flags);
1040                         BUG_ON(error < 0);
1041                 }
1042                 ovs_unlock();
1043 
1044                 ovs_nla_free_flow_actions_rcu(old_acts);
1045                 ovs_flow_free(new_flow, false);
1046         }
1047 
1048         if (reply)
1049                 ovs_notify(&dp_flow_genl_family, reply, info);
1050         return 0;
1051 
1052 err_unlock_ovs:
1053         ovs_unlock();
1054         kfree_skb(reply);
1055 err_kfree_acts:
1056         ovs_nla_free_flow_actions(acts);
1057 err_kfree_flow:
1058         ovs_flow_free(new_flow, false);
1059 error:
1060         return error;
1061 }
1062 
1063 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1064 static struct sw_flow_actions *get_flow_actions(struct net *net,
1065                                                 const struct nlattr *a,
1066                                                 const struct sw_flow_key *key,
1067                                                 const struct sw_flow_mask *mask,
1068                                                 bool log)
1069 {
1070         struct sw_flow_actions *acts;
1071         struct sw_flow_key masked_key;
1072         int error;
1073 
1074         ovs_flow_mask_key(&masked_key, key, true, mask);
1075         error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1076         if (error) {
1077                 OVS_NLERR(log,
1078                           "Actions may not be safe on all matching packets");
1079                 return ERR_PTR(error);
1080         }
1081 
1082         return acts;
1083 }
1084 
1085 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1086 {
1087         struct net *net = sock_net(skb->sk);
1088         struct nlattr **a = info->attrs;
1089         struct ovs_header *ovs_header = info->userhdr;
1090         struct sw_flow_key key;
1091         struct sw_flow *flow;
1092         struct sw_flow_mask mask;
1093         struct sk_buff *reply = NULL;
1094         struct datapath *dp;
1095         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1096         struct sw_flow_match match;
1097         struct sw_flow_id sfid;
1098         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1099         int error = 0;
1100         bool log = !a[OVS_FLOW_ATTR_PROBE];
1101         bool ufid_present;
1102 
1103         ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1104         if (a[OVS_FLOW_ATTR_KEY]) {
1105                 ovs_match_init(&match, &key, &mask);
1106                 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1107                                           a[OVS_FLOW_ATTR_MASK], log);
1108         } else if (!ufid_present) {
1109                 OVS_NLERR(log,
1110                           "Flow set message rejected, Key attribute missing.");
1111                 error = -EINVAL;
1112         }
1113         if (error)
1114                 goto error;
1115 
1116         /* Validate actions. */
1117         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1118                 if (!a[OVS_FLOW_ATTR_KEY]) {
1119                         OVS_NLERR(log,
1120                                   "Flow key attribute not present in set flow.");
1121                         error = -EINVAL;
1122                         goto error;
1123                 }
1124 
1125                 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1126                                         &mask, log);
1127                 if (IS_ERR(acts)) {
1128                         error = PTR_ERR(acts);
1129                         goto error;
1130                 }
1131 
1132                 /* Can allocate before locking if have acts. */
1133                 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1134                                                 ufid_flags);
1135                 if (IS_ERR(reply)) {
1136                         error = PTR_ERR(reply);
1137                         goto err_kfree_acts;
1138                 }
1139         }
1140 
1141         ovs_lock();
1142         dp = get_dp(net, ovs_header->dp_ifindex);
1143         if (unlikely(!dp)) {
1144                 error = -ENODEV;
1145                 goto err_unlock_ovs;
1146         }
1147         /* Check that the flow exists. */
1148         if (ufid_present)
1149                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1150         else
1151                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1152         if (unlikely(!flow)) {
1153                 error = -ENOENT;
1154                 goto err_unlock_ovs;
1155         }
1156 
1157         /* Update actions, if present. */
1158         if (likely(acts)) {
1159                 old_acts = ovsl_dereference(flow->sf_acts);
1160                 rcu_assign_pointer(flow->sf_acts, acts);
1161 
1162                 if (unlikely(reply)) {
1163                         error = ovs_flow_cmd_fill_info(flow,
1164                                                        ovs_header->dp_ifindex,
1165                                                        reply, info->snd_portid,
1166                                                        info->snd_seq, 0,
1167                                                        OVS_FLOW_CMD_NEW,
1168                                                        ufid_flags);
1169                         BUG_ON(error < 0);
1170                 }
1171         } else {
1172                 /* Could not alloc without acts before locking. */
1173                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1174                                                 info, OVS_FLOW_CMD_NEW, false,
1175                                                 ufid_flags);
1176 
1177                 if (IS_ERR(reply)) {
1178                         error = PTR_ERR(reply);
1179                         goto err_unlock_ovs;
1180                 }
1181         }
1182 
1183         /* Clear stats. */
1184         if (a[OVS_FLOW_ATTR_CLEAR])
1185                 ovs_flow_stats_clear(flow);
1186         ovs_unlock();
1187 
1188         if (reply)
1189                 ovs_notify(&dp_flow_genl_family, reply, info);
1190         if (old_acts)
1191                 ovs_nla_free_flow_actions_rcu(old_acts);
1192 
1193         return 0;
1194 
1195 err_unlock_ovs:
1196         ovs_unlock();
1197         kfree_skb(reply);
1198 err_kfree_acts:
1199         ovs_nla_free_flow_actions(acts);
1200 error:
1201         return error;
1202 }
1203 
1204 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1205 {
1206         struct nlattr **a = info->attrs;
1207         struct ovs_header *ovs_header = info->userhdr;
1208         struct net *net = sock_net(skb->sk);
1209         struct sw_flow_key key;
1210         struct sk_buff *reply;
1211         struct sw_flow *flow;
1212         struct datapath *dp;
1213         struct sw_flow_match match;
1214         struct sw_flow_id ufid;
1215         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1216         int err = 0;
1217         bool log = !a[OVS_FLOW_ATTR_PROBE];
1218         bool ufid_present;
1219 
1220         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1221         if (a[OVS_FLOW_ATTR_KEY]) {
1222                 ovs_match_init(&match, &key, NULL);
1223                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1224                                         log);
1225         } else if (!ufid_present) {
1226                 OVS_NLERR(log,
1227                           "Flow get message rejected, Key attribute missing.");
1228                 err = -EINVAL;
1229         }
1230         if (err)
1231                 return err;
1232 
1233         ovs_lock();
1234         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1235         if (!dp) {
1236                 err = -ENODEV;
1237                 goto unlock;
1238         }
1239 
1240         if (ufid_present)
1241                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1242         else
1243                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1244         if (!flow) {
1245                 err = -ENOENT;
1246                 goto unlock;
1247         }
1248 
1249         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1250                                         OVS_FLOW_CMD_NEW, true, ufid_flags);
1251         if (IS_ERR(reply)) {
1252                 err = PTR_ERR(reply);
1253                 goto unlock;
1254         }
1255 
1256         ovs_unlock();
1257         return genlmsg_reply(reply, info);
1258 unlock:
1259         ovs_unlock();
1260         return err;
1261 }
1262 
1263 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1264 {
1265         struct nlattr **a = info->attrs;
1266         struct ovs_header *ovs_header = info->userhdr;
1267         struct net *net = sock_net(skb->sk);
1268         struct sw_flow_key key;
1269         struct sk_buff *reply;
1270         struct sw_flow *flow = NULL;
1271         struct datapath *dp;
1272         struct sw_flow_match match;
1273         struct sw_flow_id ufid;
1274         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1275         int err;
1276         bool log = !a[OVS_FLOW_ATTR_PROBE];
1277         bool ufid_present;
1278 
1279         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1280         if (a[OVS_FLOW_ATTR_KEY]) {
1281                 ovs_match_init(&match, &key, NULL);
1282                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1283                                         NULL, log);
1284                 if (unlikely(err))
1285                         return err;
1286         }
1287 
1288         ovs_lock();
1289         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1290         if (unlikely(!dp)) {
1291                 err = -ENODEV;
1292                 goto unlock;
1293         }
1294 
1295         if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1296                 err = ovs_flow_tbl_flush(&dp->table);
1297                 goto unlock;
1298         }
1299 
1300         if (ufid_present)
1301                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1302         else
1303                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1304         if (unlikely(!flow)) {
1305                 err = -ENOENT;
1306                 goto unlock;
1307         }
1308 
1309         ovs_flow_tbl_remove(&dp->table, flow);
1310         ovs_unlock();
1311 
1312         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1313                                         &flow->id, info, false, ufid_flags);
1314         if (likely(reply)) {
1315                 if (likely(!IS_ERR(reply))) {
1316                         rcu_read_lock();        /*To keep RCU checker happy. */
1317                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1318                                                      reply, info->snd_portid,
1319                                                      info->snd_seq, 0,
1320                                                      OVS_FLOW_CMD_DEL,
1321                                                      ufid_flags);
1322                         rcu_read_unlock();
1323                         BUG_ON(err < 0);
1324 
1325                         ovs_notify(&dp_flow_genl_family, reply, info);
1326                 } else {
1327                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1328                 }
1329         }
1330 
1331         ovs_flow_free(flow, true);
1332         return 0;
1333 unlock:
1334         ovs_unlock();
1335         return err;
1336 }
1337 
1338 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1339 {
1340         struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1341         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1342         struct table_instance *ti;
1343         struct datapath *dp;
1344         u32 ufid_flags;
1345         int err;
1346 
1347         err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1348                             OVS_FLOW_ATTR_MAX, flow_policy);
1349         if (err)
1350                 return err;
1351         ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1352 
1353         rcu_read_lock();
1354         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1355         if (!dp) {
1356                 rcu_read_unlock();
1357                 return -ENODEV;
1358         }
1359 
1360         ti = rcu_dereference(dp->table.ti);
1361         for (;;) {
1362                 struct sw_flow *flow;
1363                 u32 bucket, obj;
1364 
1365                 bucket = cb->args[0];
1366                 obj = cb->args[1];
1367                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1368                 if (!flow)
1369                         break;
1370 
1371                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1372                                            NETLINK_CB(cb->skb).portid,
1373                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1374                                            OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1375                         break;
1376 
1377                 cb->args[0] = bucket;
1378                 cb->args[1] = obj;
1379         }
1380         rcu_read_unlock();
1381         return skb->len;
1382 }
1383 
1384 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1385         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1386         [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1387         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1388         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1389         [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1390         [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1391         [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1392 };
1393 
1394 static const struct genl_ops dp_flow_genl_ops[] = {
1395         { .cmd = OVS_FLOW_CMD_NEW,
1396           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1397           .policy = flow_policy,
1398           .doit = ovs_flow_cmd_new
1399         },
1400         { .cmd = OVS_FLOW_CMD_DEL,
1401           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1402           .policy = flow_policy,
1403           .doit = ovs_flow_cmd_del
1404         },
1405         { .cmd = OVS_FLOW_CMD_GET,
1406           .flags = 0,               /* OK for unprivileged users. */
1407           .policy = flow_policy,
1408           .doit = ovs_flow_cmd_get,
1409           .dumpit = ovs_flow_cmd_dump
1410         },
1411         { .cmd = OVS_FLOW_CMD_SET,
1412           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1413           .policy = flow_policy,
1414           .doit = ovs_flow_cmd_set,
1415         },
1416 };
1417 
1418 static struct genl_family dp_flow_genl_family = {
1419         .id = GENL_ID_GENERATE,
1420         .hdrsize = sizeof(struct ovs_header),
1421         .name = OVS_FLOW_FAMILY,
1422         .version = OVS_FLOW_VERSION,
1423         .maxattr = OVS_FLOW_ATTR_MAX,
1424         .netnsok = true,
1425         .parallel_ops = true,
1426         .ops = dp_flow_genl_ops,
1427         .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1428         .mcgrps = &ovs_dp_flow_multicast_group,
1429         .n_mcgrps = 1,
1430 };
1431 
1432 static size_t ovs_dp_cmd_msg_size(void)
1433 {
1434         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1435 
1436         msgsize += nla_total_size(IFNAMSIZ);
1437         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1438         msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1439         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1440 
1441         return msgsize;
1442 }
1443 
1444 /* Called with ovs_mutex. */
1445 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1446                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1447 {
1448         struct ovs_header *ovs_header;
1449         struct ovs_dp_stats dp_stats;
1450         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1451         int err;
1452 
1453         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1454                                    flags, cmd);
1455         if (!ovs_header)
1456                 goto error;
1457 
1458         ovs_header->dp_ifindex = get_dpifindex(dp);
1459 
1460         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1461         if (err)
1462                 goto nla_put_failure;
1463 
1464         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1465         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1466                         &dp_stats))
1467                 goto nla_put_failure;
1468 
1469         if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1470                         sizeof(struct ovs_dp_megaflow_stats),
1471                         &dp_megaflow_stats))
1472                 goto nla_put_failure;
1473 
1474         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1475                 goto nla_put_failure;
1476 
1477         genlmsg_end(skb, ovs_header);
1478         return 0;
1479 
1480 nla_put_failure:
1481         genlmsg_cancel(skb, ovs_header);
1482 error:
1483         return -EMSGSIZE;
1484 }
1485 
1486 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1487 {
1488         return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1489 }
1490 
1491 /* Called with rcu_read_lock or ovs_mutex. */
1492 static struct datapath *lookup_datapath(struct net *net,
1493                                         const struct ovs_header *ovs_header,
1494                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1495 {
1496         struct datapath *dp;
1497 
1498         if (!a[OVS_DP_ATTR_NAME])
1499                 dp = get_dp(net, ovs_header->dp_ifindex);
1500         else {
1501                 struct vport *vport;
1502 
1503                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1504                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1505         }
1506         return dp ? dp : ERR_PTR(-ENODEV);
1507 }
1508 
1509 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1510 {
1511         struct datapath *dp;
1512 
1513         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1514         if (IS_ERR(dp))
1515                 return;
1516 
1517         WARN(dp->user_features, "Dropping previously announced user features\n");
1518         dp->user_features = 0;
1519 }
1520 
1521 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1522 {
1523         if (a[OVS_DP_ATTR_USER_FEATURES])
1524                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1525 }
1526 
1527 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1528 {
1529         struct nlattr **a = info->attrs;
1530         struct vport_parms parms;
1531         struct sk_buff *reply;
1532         struct datapath *dp;
1533         struct vport *vport;
1534         struct ovs_net *ovs_net;
1535         int err, i;
1536 
1537         err = -EINVAL;
1538         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1539                 goto err;
1540 
1541         reply = ovs_dp_cmd_alloc_info();
1542         if (!reply)
1543                 return -ENOMEM;
1544 
1545         err = -ENOMEM;
1546         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1547         if (dp == NULL)
1548                 goto err_free_reply;
1549 
1550         ovs_dp_set_net(dp, sock_net(skb->sk));
1551 
1552         /* Allocate table. */
1553         err = ovs_flow_tbl_init(&dp->table);
1554         if (err)
1555                 goto err_free_dp;
1556 
1557         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1558         if (!dp->stats_percpu) {
1559                 err = -ENOMEM;
1560                 goto err_destroy_table;
1561         }
1562 
1563         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1564                             GFP_KERNEL);
1565         if (!dp->ports) {
1566                 err = -ENOMEM;
1567                 goto err_destroy_percpu;
1568         }
1569 
1570         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1571                 INIT_HLIST_HEAD(&dp->ports[i]);
1572 
1573         /* Set up our datapath device. */
1574         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1575         parms.type = OVS_VPORT_TYPE_INTERNAL;
1576         parms.options = NULL;
1577         parms.dp = dp;
1578         parms.port_no = OVSP_LOCAL;
1579         parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1580 
1581         ovs_dp_change(dp, a);
1582 
1583         /* So far only local changes have been made, now need the lock. */
1584         ovs_lock();
1585 
1586         vport = new_vport(&parms);
1587         if (IS_ERR(vport)) {
1588                 err = PTR_ERR(vport);
1589                 if (err == -EBUSY)
1590                         err = -EEXIST;
1591 
1592                 if (err == -EEXIST) {
1593                         /* An outdated user space instance that does not understand
1594                          * the concept of user_features has attempted to create a new
1595                          * datapath and is likely to reuse it. Drop all user features.
1596                          */
1597                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1598                                 ovs_dp_reset_user_features(skb, info);
1599                 }
1600 
1601                 goto err_destroy_ports_array;
1602         }
1603 
1604         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1605                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1606         BUG_ON(err < 0);
1607 
1608         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1609         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1610 
1611         ovs_unlock();
1612 
1613         ovs_notify(&dp_datapath_genl_family, reply, info);
1614         return 0;
1615 
1616 err_destroy_ports_array:
1617         ovs_unlock();
1618         kfree(dp->ports);
1619 err_destroy_percpu:
1620         free_percpu(dp->stats_percpu);
1621 err_destroy_table:
1622         ovs_flow_tbl_destroy(&dp->table);
1623 err_free_dp:
1624         kfree(dp);
1625 err_free_reply:
1626         kfree_skb(reply);
1627 err:
1628         return err;
1629 }
1630 
1631 /* Called with ovs_mutex. */
1632 static void __dp_destroy(struct datapath *dp)
1633 {
1634         int i;
1635 
1636         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1637                 struct vport *vport;
1638                 struct hlist_node *n;
1639 
1640                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1641                         if (vport->port_no != OVSP_LOCAL)
1642                                 ovs_dp_detach_port(vport);
1643         }
1644 
1645         list_del_rcu(&dp->list_node);
1646 
1647         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1648          * all ports in datapath are destroyed first before freeing datapath.
1649          */
1650         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1651 
1652         /* RCU destroy the flow table */
1653         call_rcu(&dp->rcu, destroy_dp_rcu);
1654 }
1655 
1656 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1657 {
1658         struct sk_buff *reply;
1659         struct datapath *dp;
1660         int err;
1661 
1662         reply = ovs_dp_cmd_alloc_info();
1663         if (!reply)
1664                 return -ENOMEM;
1665 
1666         ovs_lock();
1667         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1668         err = PTR_ERR(dp);
1669         if (IS_ERR(dp))
1670                 goto err_unlock_free;
1671 
1672         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1673                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1674         BUG_ON(err < 0);
1675 
1676         __dp_destroy(dp);
1677         ovs_unlock();
1678 
1679         ovs_notify(&dp_datapath_genl_family, reply, info);
1680 
1681         return 0;
1682 
1683 err_unlock_free:
1684         ovs_unlock();
1685         kfree_skb(reply);
1686         return err;
1687 }
1688 
1689 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1690 {
1691         struct sk_buff *reply;
1692         struct datapath *dp;
1693         int err;
1694 
1695         reply = ovs_dp_cmd_alloc_info();
1696         if (!reply)
1697                 return -ENOMEM;
1698 
1699         ovs_lock();
1700         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1701         err = PTR_ERR(dp);
1702         if (IS_ERR(dp))
1703                 goto err_unlock_free;
1704 
1705         ovs_dp_change(dp, info->attrs);
1706 
1707         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1708                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1709         BUG_ON(err < 0);
1710 
1711         ovs_unlock();
1712         ovs_notify(&dp_datapath_genl_family, reply, info);
1713 
1714         return 0;
1715 
1716 err_unlock_free:
1717         ovs_unlock();
1718         kfree_skb(reply);
1719         return err;
1720 }
1721 
1722 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1723 {
1724         struct sk_buff *reply;
1725         struct datapath *dp;
1726         int err;
1727 
1728         reply = ovs_dp_cmd_alloc_info();
1729         if (!reply)
1730                 return -ENOMEM;
1731 
1732         ovs_lock();
1733         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1734         if (IS_ERR(dp)) {
1735                 err = PTR_ERR(dp);
1736                 goto err_unlock_free;
1737         }
1738         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1739                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1740         BUG_ON(err < 0);
1741         ovs_unlock();
1742 
1743         return genlmsg_reply(reply, info);
1744 
1745 err_unlock_free:
1746         ovs_unlock();
1747         kfree_skb(reply);
1748         return err;
1749 }
1750 
1751 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1752 {
1753         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1754         struct datapath *dp;
1755         int skip = cb->args[0];
1756         int i = 0;
1757 
1758         ovs_lock();
1759         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1760                 if (i >= skip &&
1761                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1762                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1763                                          OVS_DP_CMD_NEW) < 0)
1764                         break;
1765                 i++;
1766         }
1767         ovs_unlock();
1768 
1769         cb->args[0] = i;
1770 
1771         return skb->len;
1772 }
1773 
1774 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1775         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1776         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1777         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1778 };
1779 
1780 static const struct genl_ops dp_datapath_genl_ops[] = {
1781         { .cmd = OVS_DP_CMD_NEW,
1782           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1783           .policy = datapath_policy,
1784           .doit = ovs_dp_cmd_new
1785         },
1786         { .cmd = OVS_DP_CMD_DEL,
1787           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1788           .policy = datapath_policy,
1789           .doit = ovs_dp_cmd_del
1790         },
1791         { .cmd = OVS_DP_CMD_GET,
1792           .flags = 0,               /* OK for unprivileged users. */
1793           .policy = datapath_policy,
1794           .doit = ovs_dp_cmd_get,
1795           .dumpit = ovs_dp_cmd_dump
1796         },
1797         { .cmd = OVS_DP_CMD_SET,
1798           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1799           .policy = datapath_policy,
1800           .doit = ovs_dp_cmd_set,
1801         },
1802 };
1803 
1804 static struct genl_family dp_datapath_genl_family = {
1805         .id = GENL_ID_GENERATE,
1806         .hdrsize = sizeof(struct ovs_header),
1807         .name = OVS_DATAPATH_FAMILY,
1808         .version = OVS_DATAPATH_VERSION,
1809         .maxattr = OVS_DP_ATTR_MAX,
1810         .netnsok = true,
1811         .parallel_ops = true,
1812         .ops = dp_datapath_genl_ops,
1813         .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1814         .mcgrps = &ovs_dp_datapath_multicast_group,
1815         .n_mcgrps = 1,
1816 };
1817 
1818 /* Called with ovs_mutex or RCU read lock. */
1819 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1820                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1821 {
1822         struct ovs_header *ovs_header;
1823         struct ovs_vport_stats vport_stats;
1824         int err;
1825 
1826         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1827                                  flags, cmd);
1828         if (!ovs_header)
1829                 return -EMSGSIZE;
1830 
1831         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1832 
1833         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1834             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1835             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1836                            ovs_vport_name(vport)))
1837                 goto nla_put_failure;
1838 
1839         ovs_vport_get_stats(vport, &vport_stats);
1840         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1841                     &vport_stats))
1842                 goto nla_put_failure;
1843 
1844         if (ovs_vport_get_upcall_portids(vport, skb))
1845                 goto nla_put_failure;
1846 
1847         err = ovs_vport_get_options(vport, skb);
1848         if (err == -EMSGSIZE)
1849                 goto error;
1850 
1851         genlmsg_end(skb, ovs_header);
1852         return 0;
1853 
1854 nla_put_failure:
1855         err = -EMSGSIZE;
1856 error:
1857         genlmsg_cancel(skb, ovs_header);
1858         return err;
1859 }
1860 
1861 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1862 {
1863         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1864 }
1865 
1866 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1867 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1868                                          u32 seq, u8 cmd)
1869 {
1870         struct sk_buff *skb;
1871         int retval;
1872 
1873         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1874         if (!skb)
1875                 return ERR_PTR(-ENOMEM);
1876 
1877         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1878         BUG_ON(retval < 0);
1879 
1880         return skb;
1881 }
1882 
1883 /* Called with ovs_mutex or RCU read lock. */
1884 static struct vport *lookup_vport(struct net *net,
1885                                   const struct ovs_header *ovs_header,
1886                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1887 {
1888         struct datapath *dp;
1889         struct vport *vport;
1890 
1891         if (a[OVS_VPORT_ATTR_NAME]) {
1892                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1893                 if (!vport)
1894                         return ERR_PTR(-ENODEV);
1895                 if (ovs_header->dp_ifindex &&
1896                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1897                         return ERR_PTR(-ENODEV);
1898                 return vport;
1899         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1900                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1901 
1902                 if (port_no >= DP_MAX_PORTS)
1903                         return ERR_PTR(-EFBIG);
1904 
1905                 dp = get_dp(net, ovs_header->dp_ifindex);
1906                 if (!dp)
1907                         return ERR_PTR(-ENODEV);
1908 
1909                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1910                 if (!vport)
1911                         return ERR_PTR(-ENODEV);
1912                 return vport;
1913         } else
1914                 return ERR_PTR(-EINVAL);
1915 }
1916 
1917 /* Called with ovs_mutex */
1918 static void update_headroom(struct datapath *dp)
1919 {
1920         unsigned dev_headroom, max_headroom = 0;
1921         struct net_device *dev;
1922         struct vport *vport;
1923         int i;
1924 
1925         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1926                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1927                         dev = vport->dev;
1928                         dev_headroom = netdev_get_fwd_headroom(dev);
1929                         if (dev_headroom > max_headroom)
1930                                 max_headroom = dev_headroom;
1931                 }
1932         }
1933 
1934         dp->max_headroom = max_headroom;
1935         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1936                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1937                         netdev_set_rx_headroom(vport->dev, max_headroom);
1938 }
1939 
1940 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1941 {
1942         struct nlattr **a = info->attrs;
1943         struct ovs_header *ovs_header = info->userhdr;
1944         struct vport_parms parms;
1945         struct sk_buff *reply;
1946         struct vport *vport;
1947         struct datapath *dp;
1948         u32 port_no;
1949         int err;
1950 
1951         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1952             !a[OVS_VPORT_ATTR_UPCALL_PID])
1953                 return -EINVAL;
1954 
1955         port_no = a[OVS_VPORT_ATTR_PORT_NO]
1956                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1957         if (port_no >= DP_MAX_PORTS)
1958                 return -EFBIG;
1959 
1960         reply = ovs_vport_cmd_alloc_info();
1961         if (!reply)
1962                 return -ENOMEM;
1963 
1964         ovs_lock();
1965 restart:
1966         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1967         err = -ENODEV;
1968         if (!dp)
1969                 goto exit_unlock_free;
1970 
1971         if (port_no) {
1972                 vport = ovs_vport_ovsl(dp, port_no);
1973                 err = -EBUSY;
1974                 if (vport)
1975                         goto exit_unlock_free;
1976         } else {
1977                 for (port_no = 1; ; port_no++) {
1978                         if (port_no >= DP_MAX_PORTS) {
1979                                 err = -EFBIG;
1980                                 goto exit_unlock_free;
1981                         }
1982                         vport = ovs_vport_ovsl(dp, port_no);
1983                         if (!vport)
1984                                 break;
1985                 }
1986         }
1987 
1988         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1989         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1990         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1991         parms.dp = dp;
1992         parms.port_no = port_no;
1993         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1994 
1995         vport = new_vport(&parms);
1996         err = PTR_ERR(vport);
1997         if (IS_ERR(vport)) {
1998                 if (err == -EAGAIN)
1999                         goto restart;
2000                 goto exit_unlock_free;
2001         }
2002 
2003         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2004                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2005 
2006         if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2007                 update_headroom(dp);
2008         else
2009                 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2010 
2011         BUG_ON(err < 0);
2012         ovs_unlock();
2013 
2014         ovs_notify(&dp_vport_genl_family, reply, info);
2015         return 0;
2016 
2017 exit_unlock_free:
2018         ovs_unlock();
2019         kfree_skb(reply);
2020         return err;
2021 }
2022 
2023 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2024 {
2025         struct nlattr **a = info->attrs;
2026         struct sk_buff *reply;
2027         struct vport *vport;
2028         int err;
2029 
2030         reply = ovs_vport_cmd_alloc_info();
2031         if (!reply)
2032                 return -ENOMEM;
2033 
2034         ovs_lock();
2035         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2036         err = PTR_ERR(vport);
2037         if (IS_ERR(vport))
2038                 goto exit_unlock_free;
2039 
2040         if (a[OVS_VPORT_ATTR_TYPE] &&
2041             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2042                 err = -EINVAL;
2043                 goto exit_unlock_free;
2044         }
2045 
2046         if (a[OVS_VPORT_ATTR_OPTIONS]) {
2047                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2048                 if (err)
2049                         goto exit_unlock_free;
2050         }
2051 
2052 
2053         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2054                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2055 
2056                 err = ovs_vport_set_upcall_portids(vport, ids);
2057                 if (err)
2058                         goto exit_unlock_free;
2059         }
2060 
2061         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2062                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2063         BUG_ON(err < 0);
2064 
2065         ovs_unlock();
2066         ovs_notify(&dp_vport_genl_family, reply, info);
2067         return 0;
2068 
2069 exit_unlock_free:
2070         ovs_unlock();
2071         kfree_skb(reply);
2072         return err;
2073 }
2074 
2075 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2076 {
2077         bool must_update_headroom = false;
2078         struct nlattr **a = info->attrs;
2079         struct sk_buff *reply;
2080         struct datapath *dp;
2081         struct vport *vport;
2082         int err;
2083 
2084         reply = ovs_vport_cmd_alloc_info();
2085         if (!reply)
2086                 return -ENOMEM;
2087 
2088         ovs_lock();
2089         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2090         err = PTR_ERR(vport);
2091         if (IS_ERR(vport))
2092                 goto exit_unlock_free;
2093 
2094         if (vport->port_no == OVSP_LOCAL) {
2095                 err = -EINVAL;
2096                 goto exit_unlock_free;
2097         }
2098 
2099         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2100                                       info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2101         BUG_ON(err < 0);
2102 
2103         /* the vport deletion may trigger dp headroom update */
2104         dp = vport->dp;
2105         if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2106                 must_update_headroom = true;
2107         netdev_reset_rx_headroom(vport->dev);
2108         ovs_dp_detach_port(vport);
2109 
2110         if (must_update_headroom)
2111                 update_headroom(dp);
2112         ovs_unlock();
2113 
2114         ovs_notify(&dp_vport_genl_family, reply, info);
2115         return 0;
2116 
2117 exit_unlock_free:
2118         ovs_unlock();
2119         kfree_skb(reply);
2120         return err;
2121 }
2122 
2123 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2124 {
2125         struct nlattr **a = info->attrs;
2126         struct ovs_header *ovs_header = info->userhdr;
2127         struct sk_buff *reply;
2128         struct vport *vport;
2129         int err;
2130 
2131         reply = ovs_vport_cmd_alloc_info();
2132         if (!reply)
2133                 return -ENOMEM;
2134 
2135         rcu_read_lock();
2136         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2137         err = PTR_ERR(vport);
2138         if (IS_ERR(vport))
2139                 goto exit_unlock_free;
2140         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2141                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2142         BUG_ON(err < 0);
2143         rcu_read_unlock();
2144 
2145         return genlmsg_reply(reply, info);
2146 
2147 exit_unlock_free:
2148         rcu_read_unlock();
2149         kfree_skb(reply);
2150         return err;
2151 }
2152 
2153 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2154 {
2155         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2156         struct datapath *dp;
2157         int bucket = cb->args[0], skip = cb->args[1];
2158         int i, j = 0;
2159 
2160         rcu_read_lock();
2161         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2162         if (!dp) {
2163                 rcu_read_unlock();
2164                 return -ENODEV;
2165         }
2166         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2167                 struct vport *vport;
2168 
2169                 j = 0;
2170                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2171                         if (j >= skip &&
2172                             ovs_vport_cmd_fill_info(vport, skb,
2173                                                     NETLINK_CB(cb->skb).portid,
2174                                                     cb->nlh->nlmsg_seq,
2175                                                     NLM_F_MULTI,
2176                                                     OVS_VPORT_CMD_NEW) < 0)
2177                                 goto out;
2178 
2179                         j++;
2180                 }
2181                 skip = 0;
2182         }
2183 out:
2184         rcu_read_unlock();
2185 
2186         cb->args[0] = i;
2187         cb->args[1] = j;
2188 
2189         return skb->len;
2190 }
2191 
2192 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2193         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2194         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2195         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2196         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2197         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2198         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2199 };
2200 
2201 static const struct genl_ops dp_vport_genl_ops[] = {
2202         { .cmd = OVS_VPORT_CMD_NEW,
2203           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2204           .policy = vport_policy,
2205           .doit = ovs_vport_cmd_new
2206         },
2207         { .cmd = OVS_VPORT_CMD_DEL,
2208           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2209           .policy = vport_policy,
2210           .doit = ovs_vport_cmd_del
2211         },
2212         { .cmd = OVS_VPORT_CMD_GET,
2213           .flags = 0,               /* OK for unprivileged users. */
2214           .policy = vport_policy,
2215           .doit = ovs_vport_cmd_get,
2216           .dumpit = ovs_vport_cmd_dump
2217         },
2218         { .cmd = OVS_VPORT_CMD_SET,
2219           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2220           .policy = vport_policy,
2221           .doit = ovs_vport_cmd_set,
2222         },
2223 };
2224 
2225 struct genl_family dp_vport_genl_family = {
2226         .id = GENL_ID_GENERATE,
2227         .hdrsize = sizeof(struct ovs_header),
2228         .name = OVS_VPORT_FAMILY,
2229         .version = OVS_VPORT_VERSION,
2230         .maxattr = OVS_VPORT_ATTR_MAX,
2231         .netnsok = true,
2232         .parallel_ops = true,
2233         .ops = dp_vport_genl_ops,
2234         .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2235         .mcgrps = &ovs_dp_vport_multicast_group,
2236         .n_mcgrps = 1,
2237 };
2238 
2239 static struct genl_family * const dp_genl_families[] = {
2240         &dp_datapath_genl_family,
2241         &dp_vport_genl_family,
2242         &dp_flow_genl_family,
2243         &dp_packet_genl_family,
2244 };
2245 
2246 static void dp_unregister_genl(int n_families)
2247 {
2248         int i;
2249 
2250         for (i = 0; i < n_families; i++)
2251                 genl_unregister_family(dp_genl_families[i]);
2252 }
2253 
2254 static int dp_register_genl(void)
2255 {
2256         int err;
2257         int i;
2258 
2259         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2260 
2261                 err = genl_register_family(dp_genl_families[i]);
2262                 if (err)
2263                         goto error;
2264         }
2265 
2266         return 0;
2267 
2268 error:
2269         dp_unregister_genl(i);
2270         return err;
2271 }
2272 
2273 static int __net_init ovs_init_net(struct net *net)
2274 {
2275         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2276 
2277         INIT_LIST_HEAD(&ovs_net->dps);
2278         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2279         ovs_ct_init(net);
2280         return 0;
2281 }
2282 
2283 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2284                                             struct list_head *head)
2285 {
2286         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2287         struct datapath *dp;
2288 
2289         list_for_each_entry(dp, &ovs_net->dps, list_node) {
2290                 int i;
2291 
2292                 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2293                         struct vport *vport;
2294 
2295                         hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2296                                 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2297                                         continue;
2298 
2299                                 if (dev_net(vport->dev) == dnet)
2300                                         list_add(&vport->detach_list, head);
2301                         }
2302                 }
2303         }
2304 }
2305 
2306 static void __net_exit ovs_exit_net(struct net *dnet)
2307 {
2308         struct datapath *dp, *dp_next;
2309         struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2310         struct vport *vport, *vport_next;
2311         struct net *net;
2312         LIST_HEAD(head);
2313 
2314         ovs_ct_exit(dnet);
2315         ovs_lock();
2316         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2317                 __dp_destroy(dp);
2318 
2319         rtnl_lock();
2320         for_each_net(net)
2321                 list_vports_from_net(net, dnet, &head);
2322         rtnl_unlock();
2323 
2324         /* Detach all vports from given namespace. */
2325         list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2326                 list_del(&vport->detach_list);
2327                 ovs_dp_detach_port(vport);
2328         }
2329 
2330         ovs_unlock();
2331 
2332         cancel_work_sync(&ovs_net->dp_notify_work);
2333 }
2334 
2335 static struct pernet_operations ovs_net_ops = {
2336         .init = ovs_init_net,
2337         .exit = ovs_exit_net,
2338         .id   = &ovs_net_id,
2339         .size = sizeof(struct ovs_net),
2340 };
2341 
2342 static int __init dp_init(void)
2343 {
2344         int err;
2345 
2346         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2347 
2348         pr_info("Open vSwitch switching datapath\n");
2349 
2350         err = action_fifos_init();
2351         if (err)
2352                 goto error;
2353 
2354         err = ovs_internal_dev_rtnl_link_register();
2355         if (err)
2356                 goto error_action_fifos_exit;
2357 
2358         err = ovs_flow_init();
2359         if (err)
2360                 goto error_unreg_rtnl_link;
2361 
2362         err = ovs_vport_init();
2363         if (err)
2364                 goto error_flow_exit;
2365 
2366         err = register_pernet_device(&ovs_net_ops);
2367         if (err)
2368                 goto error_vport_exit;
2369 
2370         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2371         if (err)
2372                 goto error_netns_exit;
2373 
2374         err = ovs_netdev_init();
2375         if (err)
2376                 goto error_unreg_notifier;
2377 
2378         err = dp_register_genl();
2379         if (err < 0)
2380                 goto error_unreg_netdev;
2381 
2382         return 0;
2383 
2384 error_unreg_netdev:
2385         ovs_netdev_exit();
2386 error_unreg_notifier:
2387         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2388 error_netns_exit:
2389         unregister_pernet_device(&ovs_net_ops);
2390 error_vport_exit:
2391         ovs_vport_exit();
2392 error_flow_exit:
2393         ovs_flow_exit();
2394 error_unreg_rtnl_link:
2395         ovs_internal_dev_rtnl_link_unregister();
2396 error_action_fifos_exit:
2397         action_fifos_exit();
2398 error:
2399         return err;
2400 }
2401 
2402 static void dp_cleanup(void)
2403 {
2404         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2405         ovs_netdev_exit();
2406         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2407         unregister_pernet_device(&ovs_net_ops);
2408         rcu_barrier();
2409         ovs_vport_exit();
2410         ovs_flow_exit();
2411         ovs_internal_dev_rtnl_link_unregister();
2412         action_fifos_exit();
2413 }
2414 
2415 module_init(dp_init);
2416 module_exit(dp_cleanup);
2417 
2418 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2419 MODULE_LICENSE("GPL");
2420 

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