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Linux/net/openvswitch/datapath.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (c) 2007-2014 Nicira, Inc.
  4  */
  5 
  6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  7 
  8 #include <linux/init.h>
  9 #include <linux/module.h>
 10 #include <linux/if_arp.h>
 11 #include <linux/if_vlan.h>
 12 #include <linux/in.h>
 13 #include <linux/ip.h>
 14 #include <linux/jhash.h>
 15 #include <linux/delay.h>
 16 #include <linux/time.h>
 17 #include <linux/etherdevice.h>
 18 #include <linux/genetlink.h>
 19 #include <linux/kernel.h>
 20 #include <linux/kthread.h>
 21 #include <linux/mutex.h>
 22 #include <linux/percpu.h>
 23 #include <linux/rcupdate.h>
 24 #include <linux/tcp.h>
 25 #include <linux/udp.h>
 26 #include <linux/ethtool.h>
 27 #include <linux/wait.h>
 28 #include <asm/div64.h>
 29 #include <linux/highmem.h>
 30 #include <linux/netfilter_bridge.h>
 31 #include <linux/netfilter_ipv4.h>
 32 #include <linux/inetdevice.h>
 33 #include <linux/list.h>
 34 #include <linux/openvswitch.h>
 35 #include <linux/rculist.h>
 36 #include <linux/dmi.h>
 37 #include <net/genetlink.h>
 38 #include <net/net_namespace.h>
 39 #include <net/netns/generic.h>
 40 
 41 #include "datapath.h"
 42 #include "flow.h"
 43 #include "flow_table.h"
 44 #include "flow_netlink.h"
 45 #include "meter.h"
 46 #include "openvswitch_trace.h"
 47 #include "vport-internal_dev.h"
 48 #include "vport-netdev.h"
 49 
 50 unsigned int ovs_net_id __read_mostly;
 51 
 52 static struct genl_family dp_packet_genl_family;
 53 static struct genl_family dp_flow_genl_family;
 54 static struct genl_family dp_datapath_genl_family;
 55 
 56 static const struct nla_policy flow_policy[];
 57 
 58 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
 59         .name = OVS_FLOW_MCGROUP,
 60 };
 61 
 62 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
 63         .name = OVS_DATAPATH_MCGROUP,
 64 };
 65 
 66 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
 67         .name = OVS_VPORT_MCGROUP,
 68 };
 69 
 70 /* Check if need to build a reply message.
 71  * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
 72 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
 73                             unsigned int group)
 74 {
 75         return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
 76                genl_has_listeners(family, genl_info_net(info), group);
 77 }
 78 
 79 static void ovs_notify(struct genl_family *family,
 80                        struct sk_buff *skb, struct genl_info *info)
 81 {
 82         genl_notify(family, skb, info, 0, GFP_KERNEL);
 83 }
 84 
 85 /**
 86  * DOC: Locking:
 87  *
 88  * All writes e.g. Writes to device state (add/remove datapath, port, set
 89  * operations on vports, etc.), Writes to other state (flow table
 90  * modifications, set miscellaneous datapath parameters, etc.) are protected
 91  * by ovs_lock.
 92  *
 93  * Reads are protected by RCU.
 94  *
 95  * There are a few special cases (mostly stats) that have their own
 96  * synchronization but they nest under all of above and don't interact with
 97  * each other.
 98  *
 99  * The RTNL lock nests inside ovs_mutex.
100  */
101 
102 static DEFINE_MUTEX(ovs_mutex);
103 
104 void ovs_lock(void)
105 {
106         mutex_lock(&ovs_mutex);
107 }
108 
109 void ovs_unlock(void)
110 {
111         mutex_unlock(&ovs_mutex);
112 }
113 
114 #ifdef CONFIG_LOCKDEP
115 int lockdep_ovsl_is_held(void)
116 {
117         if (debug_locks)
118                 return lockdep_is_held(&ovs_mutex);
119         else
120                 return 1;
121 }
122 #endif
123 
124 static struct vport *new_vport(const struct vport_parms *);
125 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
126                              const struct sw_flow_key *,
127                              const struct dp_upcall_info *,
128                              uint32_t cutlen);
129 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
130                                   const struct sw_flow_key *,
131                                   const struct dp_upcall_info *,
132                                   uint32_t cutlen);
133 
134 static void ovs_dp_masks_rebalance(struct work_struct *work);
135 
136 static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *);
137 
138 /* Must be called with rcu_read_lock or ovs_mutex. */
139 const char *ovs_dp_name(const struct datapath *dp)
140 {
141         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
142         return ovs_vport_name(vport);
143 }
144 
145 static int get_dpifindex(const struct datapath *dp)
146 {
147         struct vport *local;
148         int ifindex;
149 
150         rcu_read_lock();
151 
152         local = ovs_vport_rcu(dp, OVSP_LOCAL);
153         if (local)
154                 ifindex = local->dev->ifindex;
155         else
156                 ifindex = 0;
157 
158         rcu_read_unlock();
159 
160         return ifindex;
161 }
162 
163 static void destroy_dp_rcu(struct rcu_head *rcu)
164 {
165         struct datapath *dp = container_of(rcu, struct datapath, rcu);
166 
167         ovs_flow_tbl_destroy(&dp->table);
168         free_percpu(dp->stats_percpu);
169         kfree(dp->ports);
170         ovs_meters_exit(dp);
171         kfree(rcu_dereference_raw(dp->upcall_portids));
172         kfree(dp);
173 }
174 
175 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
176                                             u16 port_no)
177 {
178         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
179 }
180 
181 /* Called with ovs_mutex or RCU read lock. */
182 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
183 {
184         struct vport *vport;
185         struct hlist_head *head;
186 
187         head = vport_hash_bucket(dp, port_no);
188         hlist_for_each_entry_rcu(vport, head, dp_hash_node,
189                                  lockdep_ovsl_is_held()) {
190                 if (vport->port_no == port_no)
191                         return vport;
192         }
193         return NULL;
194 }
195 
196 /* Called with ovs_mutex. */
197 static struct vport *new_vport(const struct vport_parms *parms)
198 {
199         struct vport *vport;
200 
201         vport = ovs_vport_add(parms);
202         if (!IS_ERR(vport)) {
203                 struct datapath *dp = parms->dp;
204                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
205 
206                 hlist_add_head_rcu(&vport->dp_hash_node, head);
207         }
208         return vport;
209 }
210 
211 void ovs_dp_detach_port(struct vport *p)
212 {
213         ASSERT_OVSL();
214 
215         /* First drop references to device. */
216         hlist_del_rcu(&p->dp_hash_node);
217 
218         /* Then destroy it. */
219         ovs_vport_del(p);
220 }
221 
222 /* Must be called with rcu_read_lock. */
223 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
224 {
225         const struct vport *p = OVS_CB(skb)->input_vport;
226         struct datapath *dp = p->dp;
227         struct sw_flow *flow;
228         struct sw_flow_actions *sf_acts;
229         struct dp_stats_percpu *stats;
230         u64 *stats_counter;
231         u32 n_mask_hit;
232         u32 n_cache_hit;
233         int error;
234 
235         stats = this_cpu_ptr(dp->stats_percpu);
236 
237         /* Look up flow. */
238         flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
239                                          &n_mask_hit, &n_cache_hit);
240         if (unlikely(!flow)) {
241                 struct dp_upcall_info upcall;
242 
243                 memset(&upcall, 0, sizeof(upcall));
244                 upcall.cmd = OVS_PACKET_CMD_MISS;
245 
246                 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU)
247                         upcall.portid =
248                             ovs_dp_get_upcall_portid(dp, smp_processor_id());
249                 else
250                         upcall.portid = ovs_vport_find_upcall_portid(p, skb);
251 
252                 upcall.mru = OVS_CB(skb)->mru;
253                 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
254                 if (unlikely(error))
255                         kfree_skb(skb);
256                 else
257                         consume_skb(skb);
258                 stats_counter = &stats->n_missed;
259                 goto out;
260         }
261 
262         ovs_flow_stats_update(flow, key->tp.flags, skb);
263         sf_acts = rcu_dereference(flow->sf_acts);
264         error = ovs_execute_actions(dp, skb, sf_acts, key);
265         if (unlikely(error))
266                 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
267                                     ovs_dp_name(dp), error);
268 
269         stats_counter = &stats->n_hit;
270 
271 out:
272         /* Update datapath statistics. */
273         u64_stats_update_begin(&stats->syncp);
274         (*stats_counter)++;
275         stats->n_mask_hit += n_mask_hit;
276         stats->n_cache_hit += n_cache_hit;
277         u64_stats_update_end(&stats->syncp);
278 }
279 
280 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
281                   const struct sw_flow_key *key,
282                   const struct dp_upcall_info *upcall_info,
283                   uint32_t cutlen)
284 {
285         struct dp_stats_percpu *stats;
286         int err;
287 
288         if (trace_ovs_dp_upcall_enabled())
289                 trace_ovs_dp_upcall(dp, skb, key, upcall_info);
290 
291         if (upcall_info->portid == 0) {
292                 err = -ENOTCONN;
293                 goto err;
294         }
295 
296         if (!skb_is_gso(skb))
297                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
298         else
299                 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
300         if (err)
301                 goto err;
302 
303         return 0;
304 
305 err:
306         stats = this_cpu_ptr(dp->stats_percpu);
307 
308         u64_stats_update_begin(&stats->syncp);
309         stats->n_lost++;
310         u64_stats_update_end(&stats->syncp);
311 
312         return err;
313 }
314 
315 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
316                              const struct sw_flow_key *key,
317                              const struct dp_upcall_info *upcall_info,
318                              uint32_t cutlen)
319 {
320         unsigned int gso_type = skb_shinfo(skb)->gso_type;
321         struct sw_flow_key later_key;
322         struct sk_buff *segs, *nskb;
323         int err;
324 
325         BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
326         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
327         if (IS_ERR(segs))
328                 return PTR_ERR(segs);
329         if (segs == NULL)
330                 return -EINVAL;
331 
332         if (gso_type & SKB_GSO_UDP) {
333                 /* The initial flow key extracted by ovs_flow_key_extract()
334                  * in this case is for a first fragment, so we need to
335                  * properly mark later fragments.
336                  */
337                 later_key = *key;
338                 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
339         }
340 
341         /* Queue all of the segments. */
342         skb_list_walk_safe(segs, skb, nskb) {
343                 if (gso_type & SKB_GSO_UDP && skb != segs)
344                         key = &later_key;
345 
346                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
347                 if (err)
348                         break;
349 
350         }
351 
352         /* Free all of the segments. */
353         skb_list_walk_safe(segs, skb, nskb) {
354                 if (err)
355                         kfree_skb(skb);
356                 else
357                         consume_skb(skb);
358         }
359         return err;
360 }
361 
362 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
363                               unsigned int hdrlen, int actions_attrlen)
364 {
365         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
366                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
367                 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
368                 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
369                 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
370 
371         /* OVS_PACKET_ATTR_USERDATA */
372         if (upcall_info->userdata)
373                 size += NLA_ALIGN(upcall_info->userdata->nla_len);
374 
375         /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
376         if (upcall_info->egress_tun_info)
377                 size += nla_total_size(ovs_tun_key_attr_size());
378 
379         /* OVS_PACKET_ATTR_ACTIONS */
380         if (upcall_info->actions_len)
381                 size += nla_total_size(actions_attrlen);
382 
383         /* OVS_PACKET_ATTR_MRU */
384         if (upcall_info->mru)
385                 size += nla_total_size(sizeof(upcall_info->mru));
386 
387         return size;
388 }
389 
390 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
391 {
392         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
393                 size_t plen = NLA_ALIGN(skb->len) - skb->len;
394 
395                 if (plen > 0)
396                         skb_put_zero(skb, plen);
397         }
398 }
399 
400 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
401                                   const struct sw_flow_key *key,
402                                   const struct dp_upcall_info *upcall_info,
403                                   uint32_t cutlen)
404 {
405         struct ovs_header *upcall;
406         struct sk_buff *nskb = NULL;
407         struct sk_buff *user_skb = NULL; /* to be queued to userspace */
408         struct nlattr *nla;
409         size_t len;
410         unsigned int hlen;
411         int err, dp_ifindex;
412         u64 hash;
413 
414         dp_ifindex = get_dpifindex(dp);
415         if (!dp_ifindex)
416                 return -ENODEV;
417 
418         if (skb_vlan_tag_present(skb)) {
419                 nskb = skb_clone(skb, GFP_ATOMIC);
420                 if (!nskb)
421                         return -ENOMEM;
422 
423                 nskb = __vlan_hwaccel_push_inside(nskb);
424                 if (!nskb)
425                         return -ENOMEM;
426 
427                 skb = nskb;
428         }
429 
430         if (nla_attr_size(skb->len) > USHRT_MAX) {
431                 err = -EFBIG;
432                 goto out;
433         }
434 
435         /* Complete checksum if needed */
436         if (skb->ip_summed == CHECKSUM_PARTIAL &&
437             (err = skb_csum_hwoffload_help(skb, 0)))
438                 goto out;
439 
440         /* Older versions of OVS user space enforce alignment of the last
441          * Netlink attribute to NLA_ALIGNTO which would require extensive
442          * padding logic. Only perform zerocopy if padding is not required.
443          */
444         if (dp->user_features & OVS_DP_F_UNALIGNED)
445                 hlen = skb_zerocopy_headlen(skb);
446         else
447                 hlen = skb->len;
448 
449         len = upcall_msg_size(upcall_info, hlen - cutlen,
450                               OVS_CB(skb)->acts_origlen);
451         user_skb = genlmsg_new(len, GFP_ATOMIC);
452         if (!user_skb) {
453                 err = -ENOMEM;
454                 goto out;
455         }
456 
457         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
458                              0, upcall_info->cmd);
459         if (!upcall) {
460                 err = -EINVAL;
461                 goto out;
462         }
463         upcall->dp_ifindex = dp_ifindex;
464 
465         err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
466         if (err)
467                 goto out;
468 
469         if (upcall_info->userdata)
470                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
471                           nla_len(upcall_info->userdata),
472                           nla_data(upcall_info->userdata));
473 
474         if (upcall_info->egress_tun_info) {
475                 nla = nla_nest_start_noflag(user_skb,
476                                             OVS_PACKET_ATTR_EGRESS_TUN_KEY);
477                 if (!nla) {
478                         err = -EMSGSIZE;
479                         goto out;
480                 }
481                 err = ovs_nla_put_tunnel_info(user_skb,
482                                               upcall_info->egress_tun_info);
483                 if (err)
484                         goto out;
485 
486                 nla_nest_end(user_skb, nla);
487         }
488 
489         if (upcall_info->actions_len) {
490                 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
491                 if (!nla) {
492                         err = -EMSGSIZE;
493                         goto out;
494                 }
495                 err = ovs_nla_put_actions(upcall_info->actions,
496                                           upcall_info->actions_len,
497                                           user_skb);
498                 if (!err)
499                         nla_nest_end(user_skb, nla);
500                 else
501                         nla_nest_cancel(user_skb, nla);
502         }
503 
504         /* Add OVS_PACKET_ATTR_MRU */
505         if (upcall_info->mru &&
506             nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
507                 err = -ENOBUFS;
508                 goto out;
509         }
510 
511         /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
512         if (cutlen > 0 &&
513             nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
514                 err = -ENOBUFS;
515                 goto out;
516         }
517 
518         /* Add OVS_PACKET_ATTR_HASH */
519         hash = skb_get_hash_raw(skb);
520         if (skb->sw_hash)
521                 hash |= OVS_PACKET_HASH_SW_BIT;
522 
523         if (skb->l4_hash)
524                 hash |= OVS_PACKET_HASH_L4_BIT;
525 
526         if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
527                 err = -ENOBUFS;
528                 goto out;
529         }
530 
531         /* Only reserve room for attribute header, packet data is added
532          * in skb_zerocopy() */
533         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
534                 err = -ENOBUFS;
535                 goto out;
536         }
537         nla->nla_len = nla_attr_size(skb->len - cutlen);
538 
539         err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
540         if (err)
541                 goto out;
542 
543         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
544         pad_packet(dp, user_skb);
545 
546         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
547 
548         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
549         user_skb = NULL;
550 out:
551         if (err)
552                 skb_tx_error(skb);
553         kfree_skb(user_skb);
554         kfree_skb(nskb);
555         return err;
556 }
557 
558 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
559 {
560         struct ovs_header *ovs_header = info->userhdr;
561         struct net *net = sock_net(skb->sk);
562         struct nlattr **a = info->attrs;
563         struct sw_flow_actions *acts;
564         struct sk_buff *packet;
565         struct sw_flow *flow;
566         struct sw_flow_actions *sf_acts;
567         struct datapath *dp;
568         struct vport *input_vport;
569         u16 mru = 0;
570         u64 hash;
571         int len;
572         int err;
573         bool log = !a[OVS_PACKET_ATTR_PROBE];
574 
575         err = -EINVAL;
576         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
577             !a[OVS_PACKET_ATTR_ACTIONS])
578                 goto err;
579 
580         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
581         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
582         err = -ENOMEM;
583         if (!packet)
584                 goto err;
585         skb_reserve(packet, NET_IP_ALIGN);
586 
587         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
588 
589         /* Set packet's mru */
590         if (a[OVS_PACKET_ATTR_MRU]) {
591                 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
592                 packet->ignore_df = 1;
593         }
594         OVS_CB(packet)->mru = mru;
595 
596         if (a[OVS_PACKET_ATTR_HASH]) {
597                 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
598 
599                 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
600                                !!(hash & OVS_PACKET_HASH_SW_BIT),
601                                !!(hash & OVS_PACKET_HASH_L4_BIT));
602         }
603 
604         /* Build an sw_flow for sending this packet. */
605         flow = ovs_flow_alloc();
606         err = PTR_ERR(flow);
607         if (IS_ERR(flow))
608                 goto err_kfree_skb;
609 
610         err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
611                                              packet, &flow->key, log);
612         if (err)
613                 goto err_flow_free;
614 
615         err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
616                                    &flow->key, &acts, log);
617         if (err)
618                 goto err_flow_free;
619 
620         rcu_assign_pointer(flow->sf_acts, acts);
621         packet->priority = flow->key.phy.priority;
622         packet->mark = flow->key.phy.skb_mark;
623 
624         rcu_read_lock();
625         dp = get_dp_rcu(net, ovs_header->dp_ifindex);
626         err = -ENODEV;
627         if (!dp)
628                 goto err_unlock;
629 
630         input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
631         if (!input_vport)
632                 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
633 
634         if (!input_vport)
635                 goto err_unlock;
636 
637         packet->dev = input_vport->dev;
638         OVS_CB(packet)->input_vport = input_vport;
639         sf_acts = rcu_dereference(flow->sf_acts);
640 
641         local_bh_disable();
642         err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
643         local_bh_enable();
644         rcu_read_unlock();
645 
646         ovs_flow_free(flow, false);
647         return err;
648 
649 err_unlock:
650         rcu_read_unlock();
651 err_flow_free:
652         ovs_flow_free(flow, false);
653 err_kfree_skb:
654         kfree_skb(packet);
655 err:
656         return err;
657 }
658 
659 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
660         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
661         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
662         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
663         [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
664         [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
665         [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
666 };
667 
668 static const struct genl_small_ops dp_packet_genl_ops[] = {
669         { .cmd = OVS_PACKET_CMD_EXECUTE,
670           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
671           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
672           .doit = ovs_packet_cmd_execute
673         }
674 };
675 
676 static struct genl_family dp_packet_genl_family __ro_after_init = {
677         .hdrsize = sizeof(struct ovs_header),
678         .name = OVS_PACKET_FAMILY,
679         .version = OVS_PACKET_VERSION,
680         .maxattr = OVS_PACKET_ATTR_MAX,
681         .policy = packet_policy,
682         .netnsok = true,
683         .parallel_ops = true,
684         .small_ops = dp_packet_genl_ops,
685         .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
686         .module = THIS_MODULE,
687 };
688 
689 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
690                          struct ovs_dp_megaflow_stats *mega_stats)
691 {
692         int i;
693 
694         memset(mega_stats, 0, sizeof(*mega_stats));
695 
696         stats->n_flows = ovs_flow_tbl_count(&dp->table);
697         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
698 
699         stats->n_hit = stats->n_missed = stats->n_lost = 0;
700 
701         for_each_possible_cpu(i) {
702                 const struct dp_stats_percpu *percpu_stats;
703                 struct dp_stats_percpu local_stats;
704                 unsigned int start;
705 
706                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
707 
708                 do {
709                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
710                         local_stats = *percpu_stats;
711                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
712 
713                 stats->n_hit += local_stats.n_hit;
714                 stats->n_missed += local_stats.n_missed;
715                 stats->n_lost += local_stats.n_lost;
716                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
717                 mega_stats->n_cache_hit += local_stats.n_cache_hit;
718         }
719 }
720 
721 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
722 {
723         return ovs_identifier_is_ufid(sfid) &&
724                !(ufid_flags & OVS_UFID_F_OMIT_KEY);
725 }
726 
727 static bool should_fill_mask(uint32_t ufid_flags)
728 {
729         return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
730 }
731 
732 static bool should_fill_actions(uint32_t ufid_flags)
733 {
734         return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
735 }
736 
737 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
738                                     const struct sw_flow_id *sfid,
739                                     uint32_t ufid_flags)
740 {
741         size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
742 
743         /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
744          * see ovs_nla_put_identifier()
745          */
746         if (sfid && ovs_identifier_is_ufid(sfid))
747                 len += nla_total_size(sfid->ufid_len);
748         else
749                 len += nla_total_size(ovs_key_attr_size());
750 
751         /* OVS_FLOW_ATTR_KEY */
752         if (!sfid || should_fill_key(sfid, ufid_flags))
753                 len += nla_total_size(ovs_key_attr_size());
754 
755         /* OVS_FLOW_ATTR_MASK */
756         if (should_fill_mask(ufid_flags))
757                 len += nla_total_size(ovs_key_attr_size());
758 
759         /* OVS_FLOW_ATTR_ACTIONS */
760         if (should_fill_actions(ufid_flags))
761                 len += nla_total_size(acts->orig_len);
762 
763         return len
764                 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
765                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
766                 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
767 }
768 
769 /* Called with ovs_mutex or RCU read lock. */
770 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
771                                    struct sk_buff *skb)
772 {
773         struct ovs_flow_stats stats;
774         __be16 tcp_flags;
775         unsigned long used;
776 
777         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
778 
779         if (used &&
780             nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
781                               OVS_FLOW_ATTR_PAD))
782                 return -EMSGSIZE;
783 
784         if (stats.n_packets &&
785             nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
786                           sizeof(struct ovs_flow_stats), &stats,
787                           OVS_FLOW_ATTR_PAD))
788                 return -EMSGSIZE;
789 
790         if ((u8)ntohs(tcp_flags) &&
791              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
792                 return -EMSGSIZE;
793 
794         return 0;
795 }
796 
797 /* Called with ovs_mutex or RCU read lock. */
798 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
799                                      struct sk_buff *skb, int skb_orig_len)
800 {
801         struct nlattr *start;
802         int err;
803 
804         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
805          * this is the first flow to be dumped into 'skb'.  This is unusual for
806          * Netlink but individual action lists can be longer than
807          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
808          * The userspace caller can always fetch the actions separately if it
809          * really wants them.  (Most userspace callers in fact don't care.)
810          *
811          * This can only fail for dump operations because the skb is always
812          * properly sized for single flows.
813          */
814         start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
815         if (start) {
816                 const struct sw_flow_actions *sf_acts;
817 
818                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
819                 err = ovs_nla_put_actions(sf_acts->actions,
820                                           sf_acts->actions_len, skb);
821 
822                 if (!err)
823                         nla_nest_end(skb, start);
824                 else {
825                         if (skb_orig_len)
826                                 return err;
827 
828                         nla_nest_cancel(skb, start);
829                 }
830         } else if (skb_orig_len) {
831                 return -EMSGSIZE;
832         }
833 
834         return 0;
835 }
836 
837 /* Called with ovs_mutex or RCU read lock. */
838 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
839                                   struct sk_buff *skb, u32 portid,
840                                   u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
841 {
842         const int skb_orig_len = skb->len;
843         struct ovs_header *ovs_header;
844         int err;
845 
846         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
847                                  flags, cmd);
848         if (!ovs_header)
849                 return -EMSGSIZE;
850 
851         ovs_header->dp_ifindex = dp_ifindex;
852 
853         err = ovs_nla_put_identifier(flow, skb);
854         if (err)
855                 goto error;
856 
857         if (should_fill_key(&flow->id, ufid_flags)) {
858                 err = ovs_nla_put_masked_key(flow, skb);
859                 if (err)
860                         goto error;
861         }
862 
863         if (should_fill_mask(ufid_flags)) {
864                 err = ovs_nla_put_mask(flow, skb);
865                 if (err)
866                         goto error;
867         }
868 
869         err = ovs_flow_cmd_fill_stats(flow, skb);
870         if (err)
871                 goto error;
872 
873         if (should_fill_actions(ufid_flags)) {
874                 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
875                 if (err)
876                         goto error;
877         }
878 
879         genlmsg_end(skb, ovs_header);
880         return 0;
881 
882 error:
883         genlmsg_cancel(skb, ovs_header);
884         return err;
885 }
886 
887 /* May not be called with RCU read lock. */
888 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
889                                                const struct sw_flow_id *sfid,
890                                                struct genl_info *info,
891                                                bool always,
892                                                uint32_t ufid_flags)
893 {
894         struct sk_buff *skb;
895         size_t len;
896 
897         if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
898                 return NULL;
899 
900         len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
901         skb = genlmsg_new(len, GFP_KERNEL);
902         if (!skb)
903                 return ERR_PTR(-ENOMEM);
904 
905         return skb;
906 }
907 
908 /* Called with ovs_mutex. */
909 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
910                                                int dp_ifindex,
911                                                struct genl_info *info, u8 cmd,
912                                                bool always, u32 ufid_flags)
913 {
914         struct sk_buff *skb;
915         int retval;
916 
917         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
918                                       &flow->id, info, always, ufid_flags);
919         if (IS_ERR_OR_NULL(skb))
920                 return skb;
921 
922         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
923                                         info->snd_portid, info->snd_seq, 0,
924                                         cmd, ufid_flags);
925         if (WARN_ON_ONCE(retval < 0)) {
926                 kfree_skb(skb);
927                 skb = ERR_PTR(retval);
928         }
929         return skb;
930 }
931 
932 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
933 {
934         struct net *net = sock_net(skb->sk);
935         struct nlattr **a = info->attrs;
936         struct ovs_header *ovs_header = info->userhdr;
937         struct sw_flow *flow = NULL, *new_flow;
938         struct sw_flow_mask mask;
939         struct sk_buff *reply;
940         struct datapath *dp;
941         struct sw_flow_actions *acts;
942         struct sw_flow_match match;
943         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
944         int error;
945         bool log = !a[OVS_FLOW_ATTR_PROBE];
946 
947         /* Must have key and actions. */
948         error = -EINVAL;
949         if (!a[OVS_FLOW_ATTR_KEY]) {
950                 OVS_NLERR(log, "Flow key attr not present in new flow.");
951                 goto error;
952         }
953         if (!a[OVS_FLOW_ATTR_ACTIONS]) {
954                 OVS_NLERR(log, "Flow actions attr not present in new flow.");
955                 goto error;
956         }
957 
958         /* Most of the time we need to allocate a new flow, do it before
959          * locking.
960          */
961         new_flow = ovs_flow_alloc();
962         if (IS_ERR(new_flow)) {
963                 error = PTR_ERR(new_flow);
964                 goto error;
965         }
966 
967         /* Extract key. */
968         ovs_match_init(&match, &new_flow->key, false, &mask);
969         error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
970                                   a[OVS_FLOW_ATTR_MASK], log);
971         if (error)
972                 goto err_kfree_flow;
973 
974         /* Extract flow identifier. */
975         error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
976                                        &new_flow->key, log);
977         if (error)
978                 goto err_kfree_flow;
979 
980         /* unmasked key is needed to match when ufid is not used. */
981         if (ovs_identifier_is_key(&new_flow->id))
982                 match.key = new_flow->id.unmasked_key;
983 
984         ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
985 
986         /* Validate actions. */
987         error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
988                                      &new_flow->key, &acts, log);
989         if (error) {
990                 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
991                 goto err_kfree_flow;
992         }
993 
994         reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
995                                         ufid_flags);
996         if (IS_ERR(reply)) {
997                 error = PTR_ERR(reply);
998                 goto err_kfree_acts;
999         }
1000 
1001         ovs_lock();
1002         dp = get_dp(net, ovs_header->dp_ifindex);
1003         if (unlikely(!dp)) {
1004                 error = -ENODEV;
1005                 goto err_unlock_ovs;
1006         }
1007 
1008         /* Check if this is a duplicate flow */
1009         if (ovs_identifier_is_ufid(&new_flow->id))
1010                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1011         if (!flow)
1012                 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
1013         if (likely(!flow)) {
1014                 rcu_assign_pointer(new_flow->sf_acts, acts);
1015 
1016                 /* Put flow in bucket. */
1017                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1018                 if (unlikely(error)) {
1019                         acts = NULL;
1020                         goto err_unlock_ovs;
1021                 }
1022 
1023                 if (unlikely(reply)) {
1024                         error = ovs_flow_cmd_fill_info(new_flow,
1025                                                        ovs_header->dp_ifindex,
1026                                                        reply, info->snd_portid,
1027                                                        info->snd_seq, 0,
1028                                                        OVS_FLOW_CMD_NEW,
1029                                                        ufid_flags);
1030                         BUG_ON(error < 0);
1031                 }
1032                 ovs_unlock();
1033         } else {
1034                 struct sw_flow_actions *old_acts;
1035 
1036                 /* Bail out if we're not allowed to modify an existing flow.
1037                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1038                  * because Generic Netlink treats the latter as a dump
1039                  * request.  We also accept NLM_F_EXCL in case that bug ever
1040                  * gets fixed.
1041                  */
1042                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1043                                                          | NLM_F_EXCL))) {
1044                         error = -EEXIST;
1045                         goto err_unlock_ovs;
1046                 }
1047                 /* The flow identifier has to be the same for flow updates.
1048                  * Look for any overlapping flow.
1049                  */
1050                 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1051                         if (ovs_identifier_is_key(&flow->id))
1052                                 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1053                                                                  &match);
1054                         else /* UFID matches but key is different */
1055                                 flow = NULL;
1056                         if (!flow) {
1057                                 error = -ENOENT;
1058                                 goto err_unlock_ovs;
1059                         }
1060                 }
1061                 /* Update actions. */
1062                 old_acts = ovsl_dereference(flow->sf_acts);
1063                 rcu_assign_pointer(flow->sf_acts, acts);
1064 
1065                 if (unlikely(reply)) {
1066                         error = ovs_flow_cmd_fill_info(flow,
1067                                                        ovs_header->dp_ifindex,
1068                                                        reply, info->snd_portid,
1069                                                        info->snd_seq, 0,
1070                                                        OVS_FLOW_CMD_NEW,
1071                                                        ufid_flags);
1072                         BUG_ON(error < 0);
1073                 }
1074                 ovs_unlock();
1075 
1076                 ovs_nla_free_flow_actions_rcu(old_acts);
1077                 ovs_flow_free(new_flow, false);
1078         }
1079 
1080         if (reply)
1081                 ovs_notify(&dp_flow_genl_family, reply, info);
1082         return 0;
1083 
1084 err_unlock_ovs:
1085         ovs_unlock();
1086         kfree_skb(reply);
1087 err_kfree_acts:
1088         ovs_nla_free_flow_actions(acts);
1089 err_kfree_flow:
1090         ovs_flow_free(new_flow, false);
1091 error:
1092         return error;
1093 }
1094 
1095 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1096 static noinline_for_stack
1097 struct sw_flow_actions *get_flow_actions(struct net *net,
1098                                          const struct nlattr *a,
1099                                          const struct sw_flow_key *key,
1100                                          const struct sw_flow_mask *mask,
1101                                          bool log)
1102 {
1103         struct sw_flow_actions *acts;
1104         struct sw_flow_key masked_key;
1105         int error;
1106 
1107         ovs_flow_mask_key(&masked_key, key, true, mask);
1108         error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1109         if (error) {
1110                 OVS_NLERR(log,
1111                           "Actions may not be safe on all matching packets");
1112                 return ERR_PTR(error);
1113         }
1114 
1115         return acts;
1116 }
1117 
1118 /* Factor out match-init and action-copy to avoid
1119  * "Wframe-larger-than=1024" warning. Because mask is only
1120  * used to get actions, we new a function to save some
1121  * stack space.
1122  *
1123  * If there are not key and action attrs, we return 0
1124  * directly. In the case, the caller will also not use the
1125  * match as before. If there is action attr, we try to get
1126  * actions and save them to *acts. Before returning from
1127  * the function, we reset the match->mask pointer. Because
1128  * we should not to return match object with dangling reference
1129  * to mask.
1130  * */
1131 static noinline_for_stack int
1132 ovs_nla_init_match_and_action(struct net *net,
1133                               struct sw_flow_match *match,
1134                               struct sw_flow_key *key,
1135                               struct nlattr **a,
1136                               struct sw_flow_actions **acts,
1137                               bool log)
1138 {
1139         struct sw_flow_mask mask;
1140         int error = 0;
1141 
1142         if (a[OVS_FLOW_ATTR_KEY]) {
1143                 ovs_match_init(match, key, true, &mask);
1144                 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1145                                           a[OVS_FLOW_ATTR_MASK], log);
1146                 if (error)
1147                         goto error;
1148         }
1149 
1150         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1151                 if (!a[OVS_FLOW_ATTR_KEY]) {
1152                         OVS_NLERR(log,
1153                                   "Flow key attribute not present in set flow.");
1154                         error = -EINVAL;
1155                         goto error;
1156                 }
1157 
1158                 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1159                                          &mask, log);
1160                 if (IS_ERR(*acts)) {
1161                         error = PTR_ERR(*acts);
1162                         goto error;
1163                 }
1164         }
1165 
1166         /* On success, error is 0. */
1167 error:
1168         match->mask = NULL;
1169         return error;
1170 }
1171 
1172 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1173 {
1174         struct net *net = sock_net(skb->sk);
1175         struct nlattr **a = info->attrs;
1176         struct ovs_header *ovs_header = info->userhdr;
1177         struct sw_flow_key key;
1178         struct sw_flow *flow;
1179         struct sk_buff *reply = NULL;
1180         struct datapath *dp;
1181         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1182         struct sw_flow_match match;
1183         struct sw_flow_id sfid;
1184         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1185         int error = 0;
1186         bool log = !a[OVS_FLOW_ATTR_PROBE];
1187         bool ufid_present;
1188 
1189         ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1190         if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1191                 OVS_NLERR(log,
1192                           "Flow set message rejected, Key attribute missing.");
1193                 return -EINVAL;
1194         }
1195 
1196         error = ovs_nla_init_match_and_action(net, &match, &key, a,
1197                                               &acts, log);
1198         if (error)
1199                 goto error;
1200 
1201         if (acts) {
1202                 /* Can allocate before locking if have acts. */
1203                 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1204                                                 ufid_flags);
1205                 if (IS_ERR(reply)) {
1206                         error = PTR_ERR(reply);
1207                         goto err_kfree_acts;
1208                 }
1209         }
1210 
1211         ovs_lock();
1212         dp = get_dp(net, ovs_header->dp_ifindex);
1213         if (unlikely(!dp)) {
1214                 error = -ENODEV;
1215                 goto err_unlock_ovs;
1216         }
1217         /* Check that the flow exists. */
1218         if (ufid_present)
1219                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1220         else
1221                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1222         if (unlikely(!flow)) {
1223                 error = -ENOENT;
1224                 goto err_unlock_ovs;
1225         }
1226 
1227         /* Update actions, if present. */
1228         if (likely(acts)) {
1229                 old_acts = ovsl_dereference(flow->sf_acts);
1230                 rcu_assign_pointer(flow->sf_acts, acts);
1231 
1232                 if (unlikely(reply)) {
1233                         error = ovs_flow_cmd_fill_info(flow,
1234                                                        ovs_header->dp_ifindex,
1235                                                        reply, info->snd_portid,
1236                                                        info->snd_seq, 0,
1237                                                        OVS_FLOW_CMD_SET,
1238                                                        ufid_flags);
1239                         BUG_ON(error < 0);
1240                 }
1241         } else {
1242                 /* Could not alloc without acts before locking. */
1243                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1244                                                 info, OVS_FLOW_CMD_SET, false,
1245                                                 ufid_flags);
1246 
1247                 if (IS_ERR(reply)) {
1248                         error = PTR_ERR(reply);
1249                         goto err_unlock_ovs;
1250                 }
1251         }
1252 
1253         /* Clear stats. */
1254         if (a[OVS_FLOW_ATTR_CLEAR])
1255                 ovs_flow_stats_clear(flow);
1256         ovs_unlock();
1257 
1258         if (reply)
1259                 ovs_notify(&dp_flow_genl_family, reply, info);
1260         if (old_acts)
1261                 ovs_nla_free_flow_actions_rcu(old_acts);
1262 
1263         return 0;
1264 
1265 err_unlock_ovs:
1266         ovs_unlock();
1267         kfree_skb(reply);
1268 err_kfree_acts:
1269         ovs_nla_free_flow_actions(acts);
1270 error:
1271         return error;
1272 }
1273 
1274 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1275 {
1276         struct nlattr **a = info->attrs;
1277         struct ovs_header *ovs_header = info->userhdr;
1278         struct net *net = sock_net(skb->sk);
1279         struct sw_flow_key key;
1280         struct sk_buff *reply;
1281         struct sw_flow *flow;
1282         struct datapath *dp;
1283         struct sw_flow_match match;
1284         struct sw_flow_id ufid;
1285         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1286         int err = 0;
1287         bool log = !a[OVS_FLOW_ATTR_PROBE];
1288         bool ufid_present;
1289 
1290         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1291         if (a[OVS_FLOW_ATTR_KEY]) {
1292                 ovs_match_init(&match, &key, true, NULL);
1293                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1294                                         log);
1295         } else if (!ufid_present) {
1296                 OVS_NLERR(log,
1297                           "Flow get message rejected, Key attribute missing.");
1298                 err = -EINVAL;
1299         }
1300         if (err)
1301                 return err;
1302 
1303         ovs_lock();
1304         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1305         if (!dp) {
1306                 err = -ENODEV;
1307                 goto unlock;
1308         }
1309 
1310         if (ufid_present)
1311                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1312         else
1313                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1314         if (!flow) {
1315                 err = -ENOENT;
1316                 goto unlock;
1317         }
1318 
1319         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1320                                         OVS_FLOW_CMD_GET, true, ufid_flags);
1321         if (IS_ERR(reply)) {
1322                 err = PTR_ERR(reply);
1323                 goto unlock;
1324         }
1325 
1326         ovs_unlock();
1327         return genlmsg_reply(reply, info);
1328 unlock:
1329         ovs_unlock();
1330         return err;
1331 }
1332 
1333 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1334 {
1335         struct nlattr **a = info->attrs;
1336         struct ovs_header *ovs_header = info->userhdr;
1337         struct net *net = sock_net(skb->sk);
1338         struct sw_flow_key key;
1339         struct sk_buff *reply;
1340         struct sw_flow *flow = NULL;
1341         struct datapath *dp;
1342         struct sw_flow_match match;
1343         struct sw_flow_id ufid;
1344         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1345         int err;
1346         bool log = !a[OVS_FLOW_ATTR_PROBE];
1347         bool ufid_present;
1348 
1349         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1350         if (a[OVS_FLOW_ATTR_KEY]) {
1351                 ovs_match_init(&match, &key, true, NULL);
1352                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1353                                         NULL, log);
1354                 if (unlikely(err))
1355                         return err;
1356         }
1357 
1358         ovs_lock();
1359         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1360         if (unlikely(!dp)) {
1361                 err = -ENODEV;
1362                 goto unlock;
1363         }
1364 
1365         if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1366                 err = ovs_flow_tbl_flush(&dp->table);
1367                 goto unlock;
1368         }
1369 
1370         if (ufid_present)
1371                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1372         else
1373                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1374         if (unlikely(!flow)) {
1375                 err = -ENOENT;
1376                 goto unlock;
1377         }
1378 
1379         ovs_flow_tbl_remove(&dp->table, flow);
1380         ovs_unlock();
1381 
1382         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1383                                         &flow->id, info, false, ufid_flags);
1384         if (likely(reply)) {
1385                 if (!IS_ERR(reply)) {
1386                         rcu_read_lock();        /*To keep RCU checker happy. */
1387                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1388                                                      reply, info->snd_portid,
1389                                                      info->snd_seq, 0,
1390                                                      OVS_FLOW_CMD_DEL,
1391                                                      ufid_flags);
1392                         rcu_read_unlock();
1393                         if (WARN_ON_ONCE(err < 0)) {
1394                                 kfree_skb(reply);
1395                                 goto out_free;
1396                         }
1397 
1398                         ovs_notify(&dp_flow_genl_family, reply, info);
1399                 } else {
1400                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
1401                                         PTR_ERR(reply));
1402                 }
1403         }
1404 
1405 out_free:
1406         ovs_flow_free(flow, true);
1407         return 0;
1408 unlock:
1409         ovs_unlock();
1410         return err;
1411 }
1412 
1413 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1414 {
1415         struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1416         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1417         struct table_instance *ti;
1418         struct datapath *dp;
1419         u32 ufid_flags;
1420         int err;
1421 
1422         err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1423                                        OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1424         if (err)
1425                 return err;
1426         ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1427 
1428         rcu_read_lock();
1429         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1430         if (!dp) {
1431                 rcu_read_unlock();
1432                 return -ENODEV;
1433         }
1434 
1435         ti = rcu_dereference(dp->table.ti);
1436         for (;;) {
1437                 struct sw_flow *flow;
1438                 u32 bucket, obj;
1439 
1440                 bucket = cb->args[0];
1441                 obj = cb->args[1];
1442                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1443                 if (!flow)
1444                         break;
1445 
1446                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1447                                            NETLINK_CB(cb->skb).portid,
1448                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1449                                            OVS_FLOW_CMD_GET, ufid_flags) < 0)
1450                         break;
1451 
1452                 cb->args[0] = bucket;
1453                 cb->args[1] = obj;
1454         }
1455         rcu_read_unlock();
1456         return skb->len;
1457 }
1458 
1459 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1460         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1461         [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1462         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1463         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1464         [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1465         [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1466         [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1467 };
1468 
1469 static const struct genl_small_ops dp_flow_genl_ops[] = {
1470         { .cmd = OVS_FLOW_CMD_NEW,
1471           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1472           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1473           .doit = ovs_flow_cmd_new
1474         },
1475         { .cmd = OVS_FLOW_CMD_DEL,
1476           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1477           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1478           .doit = ovs_flow_cmd_del
1479         },
1480         { .cmd = OVS_FLOW_CMD_GET,
1481           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1482           .flags = 0,               /* OK for unprivileged users. */
1483           .doit = ovs_flow_cmd_get,
1484           .dumpit = ovs_flow_cmd_dump
1485         },
1486         { .cmd = OVS_FLOW_CMD_SET,
1487           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1488           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1489           .doit = ovs_flow_cmd_set,
1490         },
1491 };
1492 
1493 static struct genl_family dp_flow_genl_family __ro_after_init = {
1494         .hdrsize = sizeof(struct ovs_header),
1495         .name = OVS_FLOW_FAMILY,
1496         .version = OVS_FLOW_VERSION,
1497         .maxattr = OVS_FLOW_ATTR_MAX,
1498         .policy = flow_policy,
1499         .netnsok = true,
1500         .parallel_ops = true,
1501         .small_ops = dp_flow_genl_ops,
1502         .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
1503         .mcgrps = &ovs_dp_flow_multicast_group,
1504         .n_mcgrps = 1,
1505         .module = THIS_MODULE,
1506 };
1507 
1508 static size_t ovs_dp_cmd_msg_size(void)
1509 {
1510         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1511 
1512         msgsize += nla_total_size(IFNAMSIZ);
1513         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1514         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1515         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1516         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1517 
1518         return msgsize;
1519 }
1520 
1521 /* Called with ovs_mutex. */
1522 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1523                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1524 {
1525         struct ovs_header *ovs_header;
1526         struct ovs_dp_stats dp_stats;
1527         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1528         int err;
1529 
1530         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1531                                  flags, cmd);
1532         if (!ovs_header)
1533                 goto error;
1534 
1535         ovs_header->dp_ifindex = get_dpifindex(dp);
1536 
1537         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1538         if (err)
1539                 goto nla_put_failure;
1540 
1541         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1542         if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1543                           &dp_stats, OVS_DP_ATTR_PAD))
1544                 goto nla_put_failure;
1545 
1546         if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1547                           sizeof(struct ovs_dp_megaflow_stats),
1548                           &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1549                 goto nla_put_failure;
1550 
1551         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1552                 goto nla_put_failure;
1553 
1554         if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
1555                         ovs_flow_tbl_masks_cache_size(&dp->table)))
1556                 goto nla_put_failure;
1557 
1558         genlmsg_end(skb, ovs_header);
1559         return 0;
1560 
1561 nla_put_failure:
1562         genlmsg_cancel(skb, ovs_header);
1563 error:
1564         return -EMSGSIZE;
1565 }
1566 
1567 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1568 {
1569         return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1570 }
1571 
1572 /* Called with rcu_read_lock or ovs_mutex. */
1573 static struct datapath *lookup_datapath(struct net *net,
1574                                         const struct ovs_header *ovs_header,
1575                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1576 {
1577         struct datapath *dp;
1578 
1579         if (!a[OVS_DP_ATTR_NAME])
1580                 dp = get_dp(net, ovs_header->dp_ifindex);
1581         else {
1582                 struct vport *vport;
1583 
1584                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1585                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1586         }
1587         return dp ? dp : ERR_PTR(-ENODEV);
1588 }
1589 
1590 static void ovs_dp_reset_user_features(struct sk_buff *skb,
1591                                        struct genl_info *info)
1592 {
1593         struct datapath *dp;
1594 
1595         dp = lookup_datapath(sock_net(skb->sk), info->userhdr,
1596                              info->attrs);
1597         if (IS_ERR(dp))
1598                 return;
1599 
1600         WARN(dp->user_features, "Dropping previously announced user features\n");
1601         dp->user_features = 0;
1602 }
1603 
1604 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support);
1605 
1606 static int ovs_dp_set_upcall_portids(struct datapath *dp,
1607                               const struct nlattr *ids)
1608 {
1609         struct dp_nlsk_pids *old, *dp_nlsk_pids;
1610 
1611         if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
1612                 return -EINVAL;
1613 
1614         old = ovsl_dereference(dp->upcall_portids);
1615 
1616         dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids),
1617                                GFP_KERNEL);
1618         if (!dp_nlsk_pids)
1619                 return -ENOMEM;
1620 
1621         dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32);
1622         nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids));
1623 
1624         rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids);
1625 
1626         kfree_rcu(old, rcu);
1627 
1628         return 0;
1629 }
1630 
1631 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id)
1632 {
1633         struct dp_nlsk_pids *dp_nlsk_pids;
1634 
1635         dp_nlsk_pids = rcu_dereference(dp->upcall_portids);
1636 
1637         if (dp_nlsk_pids) {
1638                 if (cpu_id < dp_nlsk_pids->n_pids) {
1639                         return dp_nlsk_pids->pids[cpu_id];
1640                 } else if (dp_nlsk_pids->n_pids > 0 &&
1641                            cpu_id >= dp_nlsk_pids->n_pids) {
1642                         /* If the number of netlink PIDs is mismatched with
1643                          * the number of CPUs as seen by the kernel, log this
1644                          * and send the upcall to an arbitrary socket (0) in
1645                          * order to not drop packets
1646                          */
1647                         pr_info_ratelimited("cpu_id mismatch with handler threads");
1648                         return dp_nlsk_pids->pids[cpu_id %
1649                                                   dp_nlsk_pids->n_pids];
1650                 } else {
1651                         return 0;
1652                 }
1653         } else {
1654                 return 0;
1655         }
1656 }
1657 
1658 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1659 {
1660         u32 user_features = 0;
1661         int err;
1662 
1663         if (a[OVS_DP_ATTR_USER_FEATURES]) {
1664                 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1665 
1666                 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1667                                       OVS_DP_F_UNALIGNED |
1668                                       OVS_DP_F_TC_RECIRC_SHARING |
1669                                       OVS_DP_F_DISPATCH_UPCALL_PER_CPU))
1670                         return -EOPNOTSUPP;
1671 
1672 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1673                 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1674                         return -EOPNOTSUPP;
1675 #endif
1676         }
1677 
1678         if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1679                 int err;
1680                 u32 cache_size;
1681 
1682                 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1683                 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
1684                 if (err)
1685                         return err;
1686         }
1687 
1688         dp->user_features = user_features;
1689 
1690         if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU &&
1691             a[OVS_DP_ATTR_PER_CPU_PIDS]) {
1692                 /* Upcall Netlink Port IDs have been updated */
1693                 err = ovs_dp_set_upcall_portids(dp,
1694                                                 a[OVS_DP_ATTR_PER_CPU_PIDS]);
1695                 if (err)
1696                         return err;
1697         }
1698 
1699         if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1700                 static_branch_enable(&tc_recirc_sharing_support);
1701         else
1702                 static_branch_disable(&tc_recirc_sharing_support);
1703 
1704         return 0;
1705 }
1706 
1707 static int ovs_dp_stats_init(struct datapath *dp)
1708 {
1709         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1710         if (!dp->stats_percpu)
1711                 return -ENOMEM;
1712 
1713         return 0;
1714 }
1715 
1716 static int ovs_dp_vport_init(struct datapath *dp)
1717 {
1718         int i;
1719 
1720         dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1721                                   sizeof(struct hlist_head),
1722                                   GFP_KERNEL);
1723         if (!dp->ports)
1724                 return -ENOMEM;
1725 
1726         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1727                 INIT_HLIST_HEAD(&dp->ports[i]);
1728 
1729         return 0;
1730 }
1731 
1732 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1733 {
1734         struct nlattr **a = info->attrs;
1735         struct vport_parms parms;
1736         struct sk_buff *reply;
1737         struct datapath *dp;
1738         struct vport *vport;
1739         struct ovs_net *ovs_net;
1740         int err;
1741 
1742         err = -EINVAL;
1743         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1744                 goto err;
1745 
1746         reply = ovs_dp_cmd_alloc_info();
1747         if (!reply)
1748                 return -ENOMEM;
1749 
1750         err = -ENOMEM;
1751         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1752         if (dp == NULL)
1753                 goto err_destroy_reply;
1754 
1755         ovs_dp_set_net(dp, sock_net(skb->sk));
1756 
1757         /* Allocate table. */
1758         err = ovs_flow_tbl_init(&dp->table);
1759         if (err)
1760                 goto err_destroy_dp;
1761 
1762         err = ovs_dp_stats_init(dp);
1763         if (err)
1764                 goto err_destroy_table;
1765 
1766         err = ovs_dp_vport_init(dp);
1767         if (err)
1768                 goto err_destroy_stats;
1769 
1770         err = ovs_meters_init(dp);
1771         if (err)
1772                 goto err_destroy_ports;
1773 
1774         /* Set up our datapath device. */
1775         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1776         parms.type = OVS_VPORT_TYPE_INTERNAL;
1777         parms.options = NULL;
1778         parms.dp = dp;
1779         parms.port_no = OVSP_LOCAL;
1780         parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1781 
1782         /* So far only local changes have been made, now need the lock. */
1783         ovs_lock();
1784 
1785         err = ovs_dp_change(dp, a);
1786         if (err)
1787                 goto err_unlock_and_destroy_meters;
1788 
1789         vport = new_vport(&parms);
1790         if (IS_ERR(vport)) {
1791                 err = PTR_ERR(vport);
1792                 if (err == -EBUSY)
1793                         err = -EEXIST;
1794 
1795                 if (err == -EEXIST) {
1796                         /* An outdated user space instance that does not understand
1797                          * the concept of user_features has attempted to create a new
1798                          * datapath and is likely to reuse it. Drop all user features.
1799                          */
1800                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1801                                 ovs_dp_reset_user_features(skb, info);
1802                 }
1803 
1804                 goto err_unlock_and_destroy_meters;
1805         }
1806 
1807         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1808                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1809         BUG_ON(err < 0);
1810 
1811         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1812         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1813 
1814         ovs_unlock();
1815 
1816         ovs_notify(&dp_datapath_genl_family, reply, info);
1817         return 0;
1818 
1819 err_unlock_and_destroy_meters:
1820         ovs_unlock();
1821         ovs_meters_exit(dp);
1822 err_destroy_ports:
1823         kfree(dp->ports);
1824 err_destroy_stats:
1825         free_percpu(dp->stats_percpu);
1826 err_destroy_table:
1827         ovs_flow_tbl_destroy(&dp->table);
1828 err_destroy_dp:
1829         kfree(dp);
1830 err_destroy_reply:
1831         kfree_skb(reply);
1832 err:
1833         return err;
1834 }
1835 
1836 /* Called with ovs_mutex. */
1837 static void __dp_destroy(struct datapath *dp)
1838 {
1839         struct flow_table *table = &dp->table;
1840         int i;
1841 
1842         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1843                 struct vport *vport;
1844                 struct hlist_node *n;
1845 
1846                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1847                         if (vport->port_no != OVSP_LOCAL)
1848                                 ovs_dp_detach_port(vport);
1849         }
1850 
1851         list_del_rcu(&dp->list_node);
1852 
1853         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1854          * all ports in datapath are destroyed first before freeing datapath.
1855          */
1856         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1857 
1858         /* Flush sw_flow in the tables. RCU cb only releases resource
1859          * such as dp, ports and tables. That may avoid some issues
1860          * such as RCU usage warning.
1861          */
1862         table_instance_flow_flush(table, ovsl_dereference(table->ti),
1863                                   ovsl_dereference(table->ufid_ti));
1864 
1865         /* RCU destroy the ports, meters and flow tables. */
1866         call_rcu(&dp->rcu, destroy_dp_rcu);
1867 }
1868 
1869 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1870 {
1871         struct sk_buff *reply;
1872         struct datapath *dp;
1873         int err;
1874 
1875         reply = ovs_dp_cmd_alloc_info();
1876         if (!reply)
1877                 return -ENOMEM;
1878 
1879         ovs_lock();
1880         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1881         err = PTR_ERR(dp);
1882         if (IS_ERR(dp))
1883                 goto err_unlock_free;
1884 
1885         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1886                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1887         BUG_ON(err < 0);
1888 
1889         __dp_destroy(dp);
1890         ovs_unlock();
1891 
1892         ovs_notify(&dp_datapath_genl_family, reply, info);
1893 
1894         return 0;
1895 
1896 err_unlock_free:
1897         ovs_unlock();
1898         kfree_skb(reply);
1899         return err;
1900 }
1901 
1902 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1903 {
1904         struct sk_buff *reply;
1905         struct datapath *dp;
1906         int err;
1907 
1908         reply = ovs_dp_cmd_alloc_info();
1909         if (!reply)
1910                 return -ENOMEM;
1911 
1912         ovs_lock();
1913         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1914         err = PTR_ERR(dp);
1915         if (IS_ERR(dp))
1916                 goto err_unlock_free;
1917 
1918         err = ovs_dp_change(dp, info->attrs);
1919         if (err)
1920                 goto err_unlock_free;
1921 
1922         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1923                                    info->snd_seq, 0, OVS_DP_CMD_SET);
1924         BUG_ON(err < 0);
1925 
1926         ovs_unlock();
1927         ovs_notify(&dp_datapath_genl_family, reply, info);
1928 
1929         return 0;
1930 
1931 err_unlock_free:
1932         ovs_unlock();
1933         kfree_skb(reply);
1934         return err;
1935 }
1936 
1937 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1938 {
1939         struct sk_buff *reply;
1940         struct datapath *dp;
1941         int err;
1942 
1943         reply = ovs_dp_cmd_alloc_info();
1944         if (!reply)
1945                 return -ENOMEM;
1946 
1947         ovs_lock();
1948         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1949         if (IS_ERR(dp)) {
1950                 err = PTR_ERR(dp);
1951                 goto err_unlock_free;
1952         }
1953         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1954                                    info->snd_seq, 0, OVS_DP_CMD_GET);
1955         BUG_ON(err < 0);
1956         ovs_unlock();
1957 
1958         return genlmsg_reply(reply, info);
1959 
1960 err_unlock_free:
1961         ovs_unlock();
1962         kfree_skb(reply);
1963         return err;
1964 }
1965 
1966 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1967 {
1968         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1969         struct datapath *dp;
1970         int skip = cb->args[0];
1971         int i = 0;
1972 
1973         ovs_lock();
1974         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1975                 if (i >= skip &&
1976                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1977                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1978                                          OVS_DP_CMD_GET) < 0)
1979                         break;
1980                 i++;
1981         }
1982         ovs_unlock();
1983 
1984         cb->args[0] = i;
1985 
1986         return skb->len;
1987 }
1988 
1989 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1990         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1991         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1992         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1993         [OVS_DP_ATTR_MASKS_CACHE_SIZE] =  NLA_POLICY_RANGE(NLA_U32, 0,
1994                 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
1995 };
1996 
1997 static const struct genl_small_ops dp_datapath_genl_ops[] = {
1998         { .cmd = OVS_DP_CMD_NEW,
1999           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2000           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2001           .doit = ovs_dp_cmd_new
2002         },
2003         { .cmd = OVS_DP_CMD_DEL,
2004           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2005           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2006           .doit = ovs_dp_cmd_del
2007         },
2008         { .cmd = OVS_DP_CMD_GET,
2009           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2010           .flags = 0,               /* OK for unprivileged users. */
2011           .doit = ovs_dp_cmd_get,
2012           .dumpit = ovs_dp_cmd_dump
2013         },
2014         { .cmd = OVS_DP_CMD_SET,
2015           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2016           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2017           .doit = ovs_dp_cmd_set,
2018         },
2019 };
2020 
2021 static struct genl_family dp_datapath_genl_family __ro_after_init = {
2022         .hdrsize = sizeof(struct ovs_header),
2023         .name = OVS_DATAPATH_FAMILY,
2024         .version = OVS_DATAPATH_VERSION,
2025         .maxattr = OVS_DP_ATTR_MAX,
2026         .policy = datapath_policy,
2027         .netnsok = true,
2028         .parallel_ops = true,
2029         .small_ops = dp_datapath_genl_ops,
2030         .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
2031         .mcgrps = &ovs_dp_datapath_multicast_group,
2032         .n_mcgrps = 1,
2033         .module = THIS_MODULE,
2034 };
2035 
2036 /* Called with ovs_mutex or RCU read lock. */
2037 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
2038                                    struct net *net, u32 portid, u32 seq,
2039                                    u32 flags, u8 cmd, gfp_t gfp)
2040 {
2041         struct ovs_header *ovs_header;
2042         struct ovs_vport_stats vport_stats;
2043         int err;
2044 
2045         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
2046                                  flags, cmd);
2047         if (!ovs_header)
2048                 return -EMSGSIZE;
2049 
2050         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
2051 
2052         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
2053             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
2054             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
2055                            ovs_vport_name(vport)) ||
2056             nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
2057                 goto nla_put_failure;
2058 
2059         if (!net_eq(net, dev_net(vport->dev))) {
2060                 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
2061 
2062                 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
2063                         goto nla_put_failure;
2064         }
2065 
2066         ovs_vport_get_stats(vport, &vport_stats);
2067         if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
2068                           sizeof(struct ovs_vport_stats), &vport_stats,
2069                           OVS_VPORT_ATTR_PAD))
2070                 goto nla_put_failure;
2071 
2072         if (ovs_vport_get_upcall_portids(vport, skb))
2073                 goto nla_put_failure;
2074 
2075         err = ovs_vport_get_options(vport, skb);
2076         if (err == -EMSGSIZE)
2077                 goto error;
2078 
2079         genlmsg_end(skb, ovs_header);
2080         return 0;
2081 
2082 nla_put_failure:
2083         err = -EMSGSIZE;
2084 error:
2085         genlmsg_cancel(skb, ovs_header);
2086         return err;
2087 }
2088 
2089 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2090 {
2091         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2092 }
2093 
2094 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
2095 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2096                                          u32 portid, u32 seq, u8 cmd)
2097 {
2098         struct sk_buff *skb;
2099         int retval;
2100 
2101         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2102         if (!skb)
2103                 return ERR_PTR(-ENOMEM);
2104 
2105         retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2106                                          GFP_KERNEL);
2107         BUG_ON(retval < 0);
2108 
2109         return skb;
2110 }
2111 
2112 /* Called with ovs_mutex or RCU read lock. */
2113 static struct vport *lookup_vport(struct net *net,
2114                                   const struct ovs_header *ovs_header,
2115                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2116 {
2117         struct datapath *dp;
2118         struct vport *vport;
2119 
2120         if (a[OVS_VPORT_ATTR_IFINDEX])
2121                 return ERR_PTR(-EOPNOTSUPP);
2122         if (a[OVS_VPORT_ATTR_NAME]) {
2123                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2124                 if (!vport)
2125                         return ERR_PTR(-ENODEV);
2126                 if (ovs_header->dp_ifindex &&
2127                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2128                         return ERR_PTR(-ENODEV);
2129                 return vport;
2130         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2131                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2132 
2133                 if (port_no >= DP_MAX_PORTS)
2134                         return ERR_PTR(-EFBIG);
2135 
2136                 dp = get_dp(net, ovs_header->dp_ifindex);
2137                 if (!dp)
2138                         return ERR_PTR(-ENODEV);
2139 
2140                 vport = ovs_vport_ovsl_rcu(dp, port_no);
2141                 if (!vport)
2142                         return ERR_PTR(-ENODEV);
2143                 return vport;
2144         } else
2145                 return ERR_PTR(-EINVAL);
2146 
2147 }
2148 
2149 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2150 {
2151         unsigned int dev_headroom, max_headroom = 0;
2152         struct net_device *dev;
2153         struct vport *vport;
2154         int i;
2155 
2156         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2157                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2158                                          lockdep_ovsl_is_held()) {
2159                         dev = vport->dev;
2160                         dev_headroom = netdev_get_fwd_headroom(dev);
2161                         if (dev_headroom > max_headroom)
2162                                 max_headroom = dev_headroom;
2163                 }
2164         }
2165 
2166         return max_headroom;
2167 }
2168 
2169 /* Called with ovs_mutex */
2170 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2171 {
2172         struct vport *vport;
2173         int i;
2174 
2175         dp->max_headroom = new_headroom;
2176         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2177                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2178                                          lockdep_ovsl_is_held())
2179                         netdev_set_rx_headroom(vport->dev, new_headroom);
2180         }
2181 }
2182 
2183 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2184 {
2185         struct nlattr **a = info->attrs;
2186         struct ovs_header *ovs_header = info->userhdr;
2187         struct vport_parms parms;
2188         struct sk_buff *reply;
2189         struct vport *vport;
2190         struct datapath *dp;
2191         unsigned int new_headroom;
2192         u32 port_no;
2193         int err;
2194 
2195         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2196             !a[OVS_VPORT_ATTR_UPCALL_PID])
2197                 return -EINVAL;
2198         if (a[OVS_VPORT_ATTR_IFINDEX])
2199                 return -EOPNOTSUPP;
2200 
2201         port_no = a[OVS_VPORT_ATTR_PORT_NO]
2202                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2203         if (port_no >= DP_MAX_PORTS)
2204                 return -EFBIG;
2205 
2206         reply = ovs_vport_cmd_alloc_info();
2207         if (!reply)
2208                 return -ENOMEM;
2209 
2210         ovs_lock();
2211 restart:
2212         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2213         err = -ENODEV;
2214         if (!dp)
2215                 goto exit_unlock_free;
2216 
2217         if (port_no) {
2218                 vport = ovs_vport_ovsl(dp, port_no);
2219                 err = -EBUSY;
2220                 if (vport)
2221                         goto exit_unlock_free;
2222         } else {
2223                 for (port_no = 1; ; port_no++) {
2224                         if (port_no >= DP_MAX_PORTS) {
2225                                 err = -EFBIG;
2226                                 goto exit_unlock_free;
2227                         }
2228                         vport = ovs_vport_ovsl(dp, port_no);
2229                         if (!vport)
2230                                 break;
2231                 }
2232         }
2233 
2234         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2235         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2236         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2237         parms.dp = dp;
2238         parms.port_no = port_no;
2239         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2240 
2241         vport = new_vport(&parms);
2242         err = PTR_ERR(vport);
2243         if (IS_ERR(vport)) {
2244                 if (err == -EAGAIN)
2245                         goto restart;
2246                 goto exit_unlock_free;
2247         }
2248 
2249         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2250                                       info->snd_portid, info->snd_seq, 0,
2251                                       OVS_VPORT_CMD_NEW, GFP_KERNEL);
2252 
2253         new_headroom = netdev_get_fwd_headroom(vport->dev);
2254 
2255         if (new_headroom > dp->max_headroom)
2256                 ovs_update_headroom(dp, new_headroom);
2257         else
2258                 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2259 
2260         BUG_ON(err < 0);
2261         ovs_unlock();
2262 
2263         ovs_notify(&dp_vport_genl_family, reply, info);
2264         return 0;
2265 
2266 exit_unlock_free:
2267         ovs_unlock();
2268         kfree_skb(reply);
2269         return err;
2270 }
2271 
2272 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2273 {
2274         struct nlattr **a = info->attrs;
2275         struct sk_buff *reply;
2276         struct vport *vport;
2277         int err;
2278 
2279         reply = ovs_vport_cmd_alloc_info();
2280         if (!reply)
2281                 return -ENOMEM;
2282 
2283         ovs_lock();
2284         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2285         err = PTR_ERR(vport);
2286         if (IS_ERR(vport))
2287                 goto exit_unlock_free;
2288 
2289         if (a[OVS_VPORT_ATTR_TYPE] &&
2290             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2291                 err = -EINVAL;
2292                 goto exit_unlock_free;
2293         }
2294 
2295         if (a[OVS_VPORT_ATTR_OPTIONS]) {
2296                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2297                 if (err)
2298                         goto exit_unlock_free;
2299         }
2300 
2301 
2302         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2303                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2304 
2305                 err = ovs_vport_set_upcall_portids(vport, ids);
2306                 if (err)
2307                         goto exit_unlock_free;
2308         }
2309 
2310         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2311                                       info->snd_portid, info->snd_seq, 0,
2312                                       OVS_VPORT_CMD_SET, GFP_KERNEL);
2313         BUG_ON(err < 0);
2314 
2315         ovs_unlock();
2316         ovs_notify(&dp_vport_genl_family, reply, info);
2317         return 0;
2318 
2319 exit_unlock_free:
2320         ovs_unlock();
2321         kfree_skb(reply);
2322         return err;
2323 }
2324 
2325 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2326 {
2327         bool update_headroom = false;
2328         struct nlattr **a = info->attrs;
2329         struct sk_buff *reply;
2330         struct datapath *dp;
2331         struct vport *vport;
2332         unsigned int new_headroom;
2333         int err;
2334 
2335         reply = ovs_vport_cmd_alloc_info();
2336         if (!reply)
2337                 return -ENOMEM;
2338 
2339         ovs_lock();
2340         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2341         err = PTR_ERR(vport);
2342         if (IS_ERR(vport))
2343                 goto exit_unlock_free;
2344 
2345         if (vport->port_no == OVSP_LOCAL) {
2346                 err = -EINVAL;
2347                 goto exit_unlock_free;
2348         }
2349 
2350         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2351                                       info->snd_portid, info->snd_seq, 0,
2352                                       OVS_VPORT_CMD_DEL, GFP_KERNEL);
2353         BUG_ON(err < 0);
2354 
2355         /* the vport deletion may trigger dp headroom update */
2356         dp = vport->dp;
2357         if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2358                 update_headroom = true;
2359 
2360         netdev_reset_rx_headroom(vport->dev);
2361         ovs_dp_detach_port(vport);
2362 
2363         if (update_headroom) {
2364                 new_headroom = ovs_get_max_headroom(dp);
2365 
2366                 if (new_headroom < dp->max_headroom)
2367                         ovs_update_headroom(dp, new_headroom);
2368         }
2369         ovs_unlock();
2370 
2371         ovs_notify(&dp_vport_genl_family, reply, info);
2372         return 0;
2373 
2374 exit_unlock_free:
2375         ovs_unlock();
2376         kfree_skb(reply);
2377         return err;
2378 }
2379 
2380 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2381 {
2382         struct nlattr **a = info->attrs;
2383         struct ovs_header *ovs_header = info->userhdr;
2384         struct sk_buff *reply;
2385         struct vport *vport;
2386         int err;
2387 
2388         reply = ovs_vport_cmd_alloc_info();
2389         if (!reply)
2390                 return -ENOMEM;
2391 
2392         rcu_read_lock();
2393         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2394         err = PTR_ERR(vport);
2395         if (IS_ERR(vport))
2396                 goto exit_unlock_free;
2397         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2398                                       info->snd_portid, info->snd_seq, 0,
2399                                       OVS_VPORT_CMD_GET, GFP_ATOMIC);
2400         BUG_ON(err < 0);
2401         rcu_read_unlock();
2402 
2403         return genlmsg_reply(reply, info);
2404 
2405 exit_unlock_free:
2406         rcu_read_unlock();
2407         kfree_skb(reply);
2408         return err;
2409 }
2410 
2411 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2412 {
2413         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2414         struct datapath *dp;
2415         int bucket = cb->args[0], skip = cb->args[1];
2416         int i, j = 0;
2417 
2418         rcu_read_lock();
2419         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2420         if (!dp) {
2421                 rcu_read_unlock();
2422                 return -ENODEV;
2423         }
2424         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2425                 struct vport *vport;
2426 
2427                 j = 0;
2428                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2429                         if (j >= skip &&
2430                             ovs_vport_cmd_fill_info(vport, skb,
2431                                                     sock_net(skb->sk),
2432                                                     NETLINK_CB(cb->skb).portid,
2433                                                     cb->nlh->nlmsg_seq,
2434                                                     NLM_F_MULTI,
2435                                                     OVS_VPORT_CMD_GET,
2436                                                     GFP_ATOMIC) < 0)
2437                                 goto out;
2438 
2439                         j++;
2440                 }
2441                 skip = 0;
2442         }
2443 out:
2444         rcu_read_unlock();
2445 
2446         cb->args[0] = i;
2447         cb->args[1] = j;
2448 
2449         return skb->len;
2450 }
2451 
2452 static void ovs_dp_masks_rebalance(struct work_struct *work)
2453 {
2454         struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2455                                                masks_rebalance.work);
2456         struct datapath *dp;
2457 
2458         ovs_lock();
2459 
2460         list_for_each_entry(dp, &ovs_net->dps, list_node)
2461                 ovs_flow_masks_rebalance(&dp->table);
2462 
2463         ovs_unlock();
2464 
2465         schedule_delayed_work(&ovs_net->masks_rebalance,
2466                               msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2467 }
2468 
2469 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2470         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2471         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2472         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2473         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2474         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2475         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2476         [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2477         [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2478 };
2479 
2480 static const struct genl_small_ops dp_vport_genl_ops[] = {
2481         { .cmd = OVS_VPORT_CMD_NEW,
2482           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2483           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2484           .doit = ovs_vport_cmd_new
2485         },
2486         { .cmd = OVS_VPORT_CMD_DEL,
2487           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2488           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2489           .doit = ovs_vport_cmd_del
2490         },
2491         { .cmd = OVS_VPORT_CMD_GET,
2492           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2493           .flags = 0,               /* OK for unprivileged users. */
2494           .doit = ovs_vport_cmd_get,
2495           .dumpit = ovs_vport_cmd_dump
2496         },
2497         { .cmd = OVS_VPORT_CMD_SET,
2498           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2499           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2500           .doit = ovs_vport_cmd_set,
2501         },
2502 };
2503 
2504 struct genl_family dp_vport_genl_family __ro_after_init = {
2505         .hdrsize = sizeof(struct ovs_header),
2506         .name = OVS_VPORT_FAMILY,
2507         .version = OVS_VPORT_VERSION,
2508         .maxattr = OVS_VPORT_ATTR_MAX,
2509         .policy = vport_policy,
2510         .netnsok = true,
2511         .parallel_ops = true,
2512         .small_ops = dp_vport_genl_ops,
2513         .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
2514         .mcgrps = &ovs_dp_vport_multicast_group,
2515         .n_mcgrps = 1,
2516         .module = THIS_MODULE,
2517 };
2518 
2519 static struct genl_family * const dp_genl_families[] = {
2520         &dp_datapath_genl_family,
2521         &dp_vport_genl_family,
2522         &dp_flow_genl_family,
2523         &dp_packet_genl_family,
2524         &dp_meter_genl_family,
2525 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2526         &dp_ct_limit_genl_family,
2527 #endif
2528 };
2529 
2530 static void dp_unregister_genl(int n_families)
2531 {
2532         int i;
2533 
2534         for (i = 0; i < n_families; i++)
2535                 genl_unregister_family(dp_genl_families[i]);
2536 }
2537 
2538 static int __init dp_register_genl(void)
2539 {
2540         int err;
2541         int i;
2542 
2543         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2544 
2545                 err = genl_register_family(dp_genl_families[i]);
2546                 if (err)
2547                         goto error;
2548         }
2549 
2550         return 0;
2551 
2552 error:
2553         dp_unregister_genl(i);
2554         return err;
2555 }
2556 
2557 static int __net_init ovs_init_net(struct net *net)
2558 {
2559         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2560         int err;
2561 
2562         INIT_LIST_HEAD(&ovs_net->dps);
2563         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2564         INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2565 
2566         err = ovs_ct_init(net);
2567         if (err)
2568                 return err;
2569 
2570         schedule_delayed_work(&ovs_net->masks_rebalance,
2571                               msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2572         return 0;
2573 }
2574 
2575 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2576                                             struct list_head *head)
2577 {
2578         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2579         struct datapath *dp;
2580 
2581         list_for_each_entry(dp, &ovs_net->dps, list_node) {
2582                 int i;
2583 
2584                 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2585                         struct vport *vport;
2586 
2587                         hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2588                                 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2589                                         continue;
2590 
2591                                 if (dev_net(vport->dev) == dnet)
2592                                         list_add(&vport->detach_list, head);
2593                         }
2594                 }
2595         }
2596 }
2597 
2598 static void __net_exit ovs_exit_net(struct net *dnet)
2599 {
2600         struct datapath *dp, *dp_next;
2601         struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2602         struct vport *vport, *vport_next;
2603         struct net *net;
2604         LIST_HEAD(head);
2605 
2606         ovs_lock();
2607 
2608         ovs_ct_exit(dnet);
2609 
2610         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2611                 __dp_destroy(dp);
2612 
2613         down_read(&net_rwsem);
2614         for_each_net(net)
2615                 list_vports_from_net(net, dnet, &head);
2616         up_read(&net_rwsem);
2617 
2618         /* Detach all vports from given namespace. */
2619         list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2620                 list_del(&vport->detach_list);
2621                 ovs_dp_detach_port(vport);
2622         }
2623 
2624         ovs_unlock();
2625 
2626         cancel_delayed_work_sync(&ovs_net->masks_rebalance);
2627         cancel_work_sync(&ovs_net->dp_notify_work);
2628 }
2629 
2630 static struct pernet_operations ovs_net_ops = {
2631         .init = ovs_init_net,
2632         .exit = ovs_exit_net,
2633         .id   = &ovs_net_id,
2634         .size = sizeof(struct ovs_net),
2635 };
2636 
2637 static int __init dp_init(void)
2638 {
2639         int err;
2640 
2641         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
2642                      sizeof_field(struct sk_buff, cb));
2643 
2644         pr_info("Open vSwitch switching datapath\n");
2645 
2646         err = action_fifos_init();
2647         if (err)
2648                 goto error;
2649 
2650         err = ovs_internal_dev_rtnl_link_register();
2651         if (err)
2652                 goto error_action_fifos_exit;
2653 
2654         err = ovs_flow_init();
2655         if (err)
2656                 goto error_unreg_rtnl_link;
2657 
2658         err = ovs_vport_init();
2659         if (err)
2660                 goto error_flow_exit;
2661 
2662         err = register_pernet_device(&ovs_net_ops);
2663         if (err)
2664                 goto error_vport_exit;
2665 
2666         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2667         if (err)
2668                 goto error_netns_exit;
2669 
2670         err = ovs_netdev_init();
2671         if (err)
2672                 goto error_unreg_notifier;
2673 
2674         err = dp_register_genl();
2675         if (err < 0)
2676                 goto error_unreg_netdev;
2677 
2678         return 0;
2679 
2680 error_unreg_netdev:
2681         ovs_netdev_exit();
2682 error_unreg_notifier:
2683         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2684 error_netns_exit:
2685         unregister_pernet_device(&ovs_net_ops);
2686 error_vport_exit:
2687         ovs_vport_exit();
2688 error_flow_exit:
2689         ovs_flow_exit();
2690 error_unreg_rtnl_link:
2691         ovs_internal_dev_rtnl_link_unregister();
2692 error_action_fifos_exit:
2693         action_fifos_exit();
2694 error:
2695         return err;
2696 }
2697 
2698 static void dp_cleanup(void)
2699 {
2700         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2701         ovs_netdev_exit();
2702         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2703         unregister_pernet_device(&ovs_net_ops);
2704         rcu_barrier();
2705         ovs_vport_exit();
2706         ovs_flow_exit();
2707         ovs_internal_dev_rtnl_link_unregister();
2708         action_fifos_exit();
2709 }
2710 
2711 module_init(dp_init);
2712 module_exit(dp_cleanup);
2713 
2714 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2715 MODULE_LICENSE("GPL");
2716 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2717 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2718 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2719 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2720 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2721 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);
2722 

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