1 // SPDX-License-Identifier: GPL-2.0
2 /* Generic nexthop implementation
4 * Copyright (c) 2017-19 Cumulus Networks
5 * Copyright (c) 2017-19 David Ahern <dsa@cumulusnetworks.com>
8 #include <linux/nexthop.h>
9 #include <linux/rtnetlink.h>
10 #include <linux/slab.h>
12 #include <net/ipv6_stubs.h>
13 #include <net/lwtunnel.h>
14 #include <net/ndisc.h>
15 #include <net/nexthop.h>
16 #include <net/route.h>
19 #define NH_RES_DEFAULT_IDLE_TIMER (120 * HZ)
20 #define NH_RES_DEFAULT_UNBALANCED_TIMER 0 /* No forced rebalancing. */
22 static void remove_nexthop(struct net *net, struct nexthop *nh,
23 struct nl_info *nlinfo);
25 #define NH_DEV_HASHBITS 8
26 #define NH_DEV_HASHSIZE (1U << NH_DEV_HASHBITS)
28 static const struct nla_policy rtm_nh_policy_new[] = {
29 [NHA_ID] = { .type = NLA_U32 },
30 [NHA_GROUP] = { .type = NLA_BINARY },
31 [NHA_GROUP_TYPE] = { .type = NLA_U16 },
32 [NHA_BLACKHOLE] = { .type = NLA_FLAG },
33 [NHA_OIF] = { .type = NLA_U32 },
34 [NHA_GATEWAY] = { .type = NLA_BINARY },
35 [NHA_ENCAP_TYPE] = { .type = NLA_U16 },
36 [NHA_ENCAP] = { .type = NLA_NESTED },
37 [NHA_FDB] = { .type = NLA_FLAG },
38 [NHA_RES_GROUP] = { .type = NLA_NESTED },
41 static const struct nla_policy rtm_nh_policy_get[] = {
42 [NHA_ID] = { .type = NLA_U32 },
45 static const struct nla_policy rtm_nh_policy_dump[] = {
46 [NHA_OIF] = { .type = NLA_U32 },
47 [NHA_GROUPS] = { .type = NLA_FLAG },
48 [NHA_MASTER] = { .type = NLA_U32 },
49 [NHA_FDB] = { .type = NLA_FLAG },
52 static const struct nla_policy rtm_nh_res_policy_new[] = {
53 [NHA_RES_GROUP_BUCKETS] = { .type = NLA_U16 },
54 [NHA_RES_GROUP_IDLE_TIMER] = { .type = NLA_U32 },
55 [NHA_RES_GROUP_UNBALANCED_TIMER] = { .type = NLA_U32 },
58 static const struct nla_policy rtm_nh_policy_dump_bucket[] = {
59 [NHA_ID] = { .type = NLA_U32 },
60 [NHA_OIF] = { .type = NLA_U32 },
61 [NHA_MASTER] = { .type = NLA_U32 },
62 [NHA_RES_BUCKET] = { .type = NLA_NESTED },
65 static const struct nla_policy rtm_nh_res_bucket_policy_dump[] = {
66 [NHA_RES_BUCKET_NH_ID] = { .type = NLA_U32 },
69 static const struct nla_policy rtm_nh_policy_get_bucket[] = {
70 [NHA_ID] = { .type = NLA_U32 },
71 [NHA_RES_BUCKET] = { .type = NLA_NESTED },
74 static const struct nla_policy rtm_nh_res_bucket_policy_get[] = {
75 [NHA_RES_BUCKET_INDEX] = { .type = NLA_U16 },
78 static bool nexthop_notifiers_is_empty(struct net *net)
80 return !net->nexthop.notifier_chain.head;
84 __nh_notifier_single_info_init(struct nh_notifier_single_info *nh_info,
85 const struct nh_info *nhi)
87 nh_info->dev = nhi->fib_nhc.nhc_dev;
88 nh_info->gw_family = nhi->fib_nhc.nhc_gw_family;
89 if (nh_info->gw_family == AF_INET)
90 nh_info->ipv4 = nhi->fib_nhc.nhc_gw.ipv4;
91 else if (nh_info->gw_family == AF_INET6)
92 nh_info->ipv6 = nhi->fib_nhc.nhc_gw.ipv6;
94 nh_info->is_reject = nhi->reject_nh;
95 nh_info->is_fdb = nhi->fdb_nh;
96 nh_info->has_encap = !!nhi->fib_nhc.nhc_lwtstate;
99 static int nh_notifier_single_info_init(struct nh_notifier_info *info,
100 const struct nexthop *nh)
102 struct nh_info *nhi = rtnl_dereference(nh->nh_info);
104 info->type = NH_NOTIFIER_INFO_TYPE_SINGLE;
105 info->nh = kzalloc(sizeof(*info->nh), GFP_KERNEL);
109 __nh_notifier_single_info_init(info->nh, nhi);
114 static void nh_notifier_single_info_fini(struct nh_notifier_info *info)
119 static int nh_notifier_mpath_info_init(struct nh_notifier_info *info,
120 struct nh_group *nhg)
122 u16 num_nh = nhg->num_nh;
125 info->type = NH_NOTIFIER_INFO_TYPE_GRP;
126 info->nh_grp = kzalloc(struct_size(info->nh_grp, nh_entries, num_nh),
131 info->nh_grp->num_nh = num_nh;
132 info->nh_grp->is_fdb = nhg->fdb_nh;
134 for (i = 0; i < num_nh; i++) {
135 struct nh_grp_entry *nhge = &nhg->nh_entries[i];
138 nhi = rtnl_dereference(nhge->nh->nh_info);
139 info->nh_grp->nh_entries[i].id = nhge->nh->id;
140 info->nh_grp->nh_entries[i].weight = nhge->weight;
141 __nh_notifier_single_info_init(&info->nh_grp->nh_entries[i].nh,
148 static int nh_notifier_res_table_info_init(struct nh_notifier_info *info,
149 struct nh_group *nhg)
151 struct nh_res_table *res_table = rtnl_dereference(nhg->res_table);
152 u16 num_nh_buckets = res_table->num_nh_buckets;
156 info->type = NH_NOTIFIER_INFO_TYPE_RES_TABLE;
157 size = struct_size(info->nh_res_table, nhs, num_nh_buckets);
158 info->nh_res_table = __vmalloc(size, GFP_KERNEL | __GFP_ZERO |
160 if (!info->nh_res_table)
163 info->nh_res_table->num_nh_buckets = num_nh_buckets;
165 for (i = 0; i < num_nh_buckets; i++) {
166 struct nh_res_bucket *bucket = &res_table->nh_buckets[i];
167 struct nh_grp_entry *nhge;
170 nhge = rtnl_dereference(bucket->nh_entry);
171 nhi = rtnl_dereference(nhge->nh->nh_info);
172 __nh_notifier_single_info_init(&info->nh_res_table->nhs[i],
179 static int nh_notifier_grp_info_init(struct nh_notifier_info *info,
180 const struct nexthop *nh)
182 struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
184 if (nhg->hash_threshold)
185 return nh_notifier_mpath_info_init(info, nhg);
186 else if (nhg->resilient)
187 return nh_notifier_res_table_info_init(info, nhg);
191 static void nh_notifier_grp_info_fini(struct nh_notifier_info *info,
192 const struct nexthop *nh)
194 struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
196 if (nhg->hash_threshold)
198 else if (nhg->resilient)
199 vfree(info->nh_res_table);
202 static int nh_notifier_info_init(struct nh_notifier_info *info,
203 const struct nexthop *nh)
208 return nh_notifier_grp_info_init(info, nh);
210 return nh_notifier_single_info_init(info, nh);
213 static void nh_notifier_info_fini(struct nh_notifier_info *info,
214 const struct nexthop *nh)
217 nh_notifier_grp_info_fini(info, nh);
219 nh_notifier_single_info_fini(info);
222 static int call_nexthop_notifiers(struct net *net,
223 enum nexthop_event_type event_type,
225 struct netlink_ext_ack *extack)
227 struct nh_notifier_info info = {
235 if (nexthop_notifiers_is_empty(net))
238 err = nh_notifier_info_init(&info, nh);
240 NL_SET_ERR_MSG(extack, "Failed to initialize nexthop notifier info");
244 err = blocking_notifier_call_chain(&net->nexthop.notifier_chain,
246 nh_notifier_info_fini(&info, nh);
248 return notifier_to_errno(err);
252 nh_notifier_res_bucket_idle_timer_get(const struct nh_notifier_info *info,
253 bool force, unsigned int *p_idle_timer_ms)
255 struct nh_res_table *res_table;
256 struct nh_group *nhg;
260 /* When 'force' is false, nexthop bucket replacement is performed
261 * because the bucket was deemed to be idle. In this case, capable
262 * listeners can choose to perform an atomic replacement: The bucket is
263 * only replaced if it is inactive. However, if the idle timer interval
264 * is smaller than the interval in which a listener is querying
265 * buckets' activity from the device, then atomic replacement should
266 * not be tried. Pass the idle timer value to listeners, so that they
267 * could determine which type of replacement to perform.
270 *p_idle_timer_ms = 0;
276 nh = nexthop_find_by_id(info->net, info->id);
282 nhg = rcu_dereference(nh->nh_grp);
283 res_table = rcu_dereference(nhg->res_table);
284 *p_idle_timer_ms = jiffies_to_msecs(res_table->idle_timer);
292 static int nh_notifier_res_bucket_info_init(struct nh_notifier_info *info,
293 u16 bucket_index, bool force,
294 struct nh_info *oldi,
295 struct nh_info *newi)
297 unsigned int idle_timer_ms;
300 err = nh_notifier_res_bucket_idle_timer_get(info, force,
305 info->type = NH_NOTIFIER_INFO_TYPE_RES_BUCKET;
306 info->nh_res_bucket = kzalloc(sizeof(*info->nh_res_bucket),
308 if (!info->nh_res_bucket)
311 info->nh_res_bucket->bucket_index = bucket_index;
312 info->nh_res_bucket->idle_timer_ms = idle_timer_ms;
313 info->nh_res_bucket->force = force;
314 __nh_notifier_single_info_init(&info->nh_res_bucket->old_nh, oldi);
315 __nh_notifier_single_info_init(&info->nh_res_bucket->new_nh, newi);
319 static void nh_notifier_res_bucket_info_fini(struct nh_notifier_info *info)
321 kfree(info->nh_res_bucket);
324 static int __call_nexthop_res_bucket_notifiers(struct net *net, u32 nhg_id,
325 u16 bucket_index, bool force,
326 struct nh_info *oldi,
327 struct nh_info *newi,
328 struct netlink_ext_ack *extack)
330 struct nh_notifier_info info = {
337 if (nexthop_notifiers_is_empty(net))
340 err = nh_notifier_res_bucket_info_init(&info, bucket_index, force,
345 err = blocking_notifier_call_chain(&net->nexthop.notifier_chain,
346 NEXTHOP_EVENT_BUCKET_REPLACE, &info);
347 nh_notifier_res_bucket_info_fini(&info);
349 return notifier_to_errno(err);
352 /* There are three users of RES_TABLE, and NHs etc. referenced from there:
354 * 1) a collection of callbacks for NH maintenance. This operates under
356 * 2) the delayed work that gradually balances the resilient table,
357 * 3) and nexthop_select_path(), operating under RCU.
359 * Both the delayed work and the RTNL block are writers, and need to
360 * maintain mutual exclusion. Since there are only two and well-known
361 * writers for each table, the RTNL code can make sure it has exclusive
364 * - Have the DW operate without locking;
365 * - synchronously cancel the DW;
367 * - if the write was not actually a delete, call upkeep, which schedules
368 * DW again if necessary.
370 * The functions that are always called from the RTNL context use
371 * rtnl_dereference(). The functions that can also be called from the DW do
372 * a raw dereference and rely on the above mutual exclusion scheme.
374 #define nh_res_dereference(p) (rcu_dereference_raw(p))
376 static int call_nexthop_res_bucket_notifiers(struct net *net, u32 nhg_id,
377 u16 bucket_index, bool force,
378 struct nexthop *old_nh,
379 struct nexthop *new_nh,
380 struct netlink_ext_ack *extack)
382 struct nh_info *oldi = nh_res_dereference(old_nh->nh_info);
383 struct nh_info *newi = nh_res_dereference(new_nh->nh_info);
385 return __call_nexthop_res_bucket_notifiers(net, nhg_id, bucket_index,
386 force, oldi, newi, extack);
389 static int call_nexthop_res_table_notifiers(struct net *net, struct nexthop *nh,
390 struct netlink_ext_ack *extack)
392 struct nh_notifier_info info = {
396 struct nh_group *nhg;
401 if (nexthop_notifiers_is_empty(net))
404 /* At this point, the nexthop buckets are still not populated. Only
405 * emit a notification with the logical nexthops, so that a listener
406 * could potentially veto it in case of unsupported configuration.
408 nhg = rtnl_dereference(nh->nh_grp);
409 err = nh_notifier_mpath_info_init(&info, nhg);
411 NL_SET_ERR_MSG(extack, "Failed to initialize nexthop notifier info");
415 err = blocking_notifier_call_chain(&net->nexthop.notifier_chain,
416 NEXTHOP_EVENT_RES_TABLE_PRE_REPLACE,
420 return notifier_to_errno(err);
423 static int call_nexthop_notifier(struct notifier_block *nb, struct net *net,
424 enum nexthop_event_type event_type,
426 struct netlink_ext_ack *extack)
428 struct nh_notifier_info info = {
434 err = nh_notifier_info_init(&info, nh);
438 err = nb->notifier_call(nb, event_type, &info);
439 nh_notifier_info_fini(&info, nh);
441 return notifier_to_errno(err);
444 static unsigned int nh_dev_hashfn(unsigned int val)
446 unsigned int mask = NH_DEV_HASHSIZE - 1;
449 (val >> NH_DEV_HASHBITS) ^
450 (val >> (NH_DEV_HASHBITS * 2))) & mask;
453 static void nexthop_devhash_add(struct net *net, struct nh_info *nhi)
455 struct net_device *dev = nhi->fib_nhc.nhc_dev;
456 struct hlist_head *head;
461 hash = nh_dev_hashfn(dev->ifindex);
462 head = &net->nexthop.devhash[hash];
463 hlist_add_head(&nhi->dev_hash, head);
466 static void nexthop_free_group(struct nexthop *nh)
468 struct nh_group *nhg;
471 nhg = rcu_dereference_raw(nh->nh_grp);
472 for (i = 0; i < nhg->num_nh; ++i) {
473 struct nh_grp_entry *nhge = &nhg->nh_entries[i];
475 WARN_ON(!list_empty(&nhge->nh_list));
476 nexthop_put(nhge->nh);
479 WARN_ON(nhg->spare == nhg);
482 vfree(rcu_dereference_raw(nhg->res_table));
488 static void nexthop_free_single(struct nexthop *nh)
492 nhi = rcu_dereference_raw(nh->nh_info);
493 switch (nhi->family) {
495 fib_nh_release(nh->net, &nhi->fib_nh);
498 ipv6_stub->fib6_nh_release(&nhi->fib6_nh);
504 void nexthop_free_rcu(struct rcu_head *head)
506 struct nexthop *nh = container_of(head, struct nexthop, rcu);
509 nexthop_free_group(nh);
511 nexthop_free_single(nh);
515 EXPORT_SYMBOL_GPL(nexthop_free_rcu);
517 static struct nexthop *nexthop_alloc(void)
521 nh = kzalloc(sizeof(struct nexthop), GFP_KERNEL);
523 INIT_LIST_HEAD(&nh->fi_list);
524 INIT_LIST_HEAD(&nh->f6i_list);
525 INIT_LIST_HEAD(&nh->grp_list);
526 INIT_LIST_HEAD(&nh->fdb_list);
531 static struct nh_group *nexthop_grp_alloc(u16 num_nh)
533 struct nh_group *nhg;
535 nhg = kzalloc(struct_size(nhg, nh_entries, num_nh), GFP_KERNEL);
537 nhg->num_nh = num_nh;
542 static void nh_res_table_upkeep_dw(struct work_struct *work);
544 static struct nh_res_table *
545 nexthop_res_table_alloc(struct net *net, u32 nhg_id, struct nh_config *cfg)
547 const u16 num_nh_buckets = cfg->nh_grp_res_num_buckets;
548 struct nh_res_table *res_table;
551 size = struct_size(res_table, nh_buckets, num_nh_buckets);
552 res_table = __vmalloc(size, GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN);
556 res_table->net = net;
557 res_table->nhg_id = nhg_id;
558 INIT_DELAYED_WORK(&res_table->upkeep_dw, &nh_res_table_upkeep_dw);
559 INIT_LIST_HEAD(&res_table->uw_nh_entries);
560 res_table->idle_timer = cfg->nh_grp_res_idle_timer;
561 res_table->unbalanced_timer = cfg->nh_grp_res_unbalanced_timer;
562 res_table->num_nh_buckets = num_nh_buckets;
566 static void nh_base_seq_inc(struct net *net)
568 while (++net->nexthop.seq == 0)
572 /* no reference taken; rcu lock or rtnl must be held */
573 struct nexthop *nexthop_find_by_id(struct net *net, u32 id)
575 struct rb_node **pp, *parent = NULL, *next;
577 pp = &net->nexthop.rb_root.rb_node;
581 next = rcu_dereference_raw(*pp);
586 nh = rb_entry(parent, struct nexthop, rb_node);
589 else if (id > nh->id)
590 pp = &next->rb_right;
596 EXPORT_SYMBOL_GPL(nexthop_find_by_id);
598 /* used for auto id allocation; called with rtnl held */
599 static u32 nh_find_unused_id(struct net *net)
601 u32 id_start = net->nexthop.last_id_allocated;
604 net->nexthop.last_id_allocated++;
605 if (net->nexthop.last_id_allocated == id_start)
608 if (!nexthop_find_by_id(net, net->nexthop.last_id_allocated))
609 return net->nexthop.last_id_allocated;
614 static void nh_res_time_set_deadline(unsigned long next_time,
615 unsigned long *deadline)
617 if (time_before(next_time, *deadline))
618 *deadline = next_time;
621 static clock_t nh_res_table_unbalanced_time(struct nh_res_table *res_table)
623 if (list_empty(&res_table->uw_nh_entries))
625 return jiffies_delta_to_clock_t(jiffies - res_table->unbalanced_since);
628 static int nla_put_nh_group_res(struct sk_buff *skb, struct nh_group *nhg)
630 struct nh_res_table *res_table = rtnl_dereference(nhg->res_table);
633 nest = nla_nest_start(skb, NHA_RES_GROUP);
637 if (nla_put_u16(skb, NHA_RES_GROUP_BUCKETS,
638 res_table->num_nh_buckets) ||
639 nla_put_u32(skb, NHA_RES_GROUP_IDLE_TIMER,
640 jiffies_to_clock_t(res_table->idle_timer)) ||
641 nla_put_u32(skb, NHA_RES_GROUP_UNBALANCED_TIMER,
642 jiffies_to_clock_t(res_table->unbalanced_timer)) ||
643 nla_put_u64_64bit(skb, NHA_RES_GROUP_UNBALANCED_TIME,
644 nh_res_table_unbalanced_time(res_table),
646 goto nla_put_failure;
648 nla_nest_end(skb, nest);
652 nla_nest_cancel(skb, nest);
656 static int nla_put_nh_group(struct sk_buff *skb, struct nh_group *nhg)
658 struct nexthop_grp *p;
659 size_t len = nhg->num_nh * sizeof(*p);
664 if (nhg->hash_threshold)
665 group_type = NEXTHOP_GRP_TYPE_MPATH;
666 else if (nhg->resilient)
667 group_type = NEXTHOP_GRP_TYPE_RES;
669 if (nla_put_u16(skb, NHA_GROUP_TYPE, group_type))
670 goto nla_put_failure;
672 nla = nla_reserve(skb, NHA_GROUP, len);
674 goto nla_put_failure;
677 for (i = 0; i < nhg->num_nh; ++i) {
678 p->id = nhg->nh_entries[i].nh->id;
679 p->weight = nhg->nh_entries[i].weight - 1;
683 if (nhg->resilient && nla_put_nh_group_res(skb, nhg))
684 goto nla_put_failure;
692 static int nh_fill_node(struct sk_buff *skb, struct nexthop *nh,
693 int event, u32 portid, u32 seq, unsigned int nlflags)
695 struct fib6_nh *fib6_nh;
696 struct fib_nh *fib_nh;
697 struct nlmsghdr *nlh;
701 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nhm), nlflags);
705 nhm = nlmsg_data(nlh);
706 nhm->nh_family = AF_UNSPEC;
707 nhm->nh_flags = nh->nh_flags;
708 nhm->nh_protocol = nh->protocol;
712 if (nla_put_u32(skb, NHA_ID, nh->id))
713 goto nla_put_failure;
716 struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
718 if (nhg->fdb_nh && nla_put_flag(skb, NHA_FDB))
719 goto nla_put_failure;
720 if (nla_put_nh_group(skb, nhg))
721 goto nla_put_failure;
725 nhi = rtnl_dereference(nh->nh_info);
726 nhm->nh_family = nhi->family;
727 if (nhi->reject_nh) {
728 if (nla_put_flag(skb, NHA_BLACKHOLE))
729 goto nla_put_failure;
731 } else if (nhi->fdb_nh) {
732 if (nla_put_flag(skb, NHA_FDB))
733 goto nla_put_failure;
735 const struct net_device *dev;
737 dev = nhi->fib_nhc.nhc_dev;
738 if (dev && nla_put_u32(skb, NHA_OIF, dev->ifindex))
739 goto nla_put_failure;
742 nhm->nh_scope = nhi->fib_nhc.nhc_scope;
743 switch (nhi->family) {
745 fib_nh = &nhi->fib_nh;
746 if (fib_nh->fib_nh_gw_family &&
747 nla_put_be32(skb, NHA_GATEWAY, fib_nh->fib_nh_gw4))
748 goto nla_put_failure;
752 fib6_nh = &nhi->fib6_nh;
753 if (fib6_nh->fib_nh_gw_family &&
754 nla_put_in6_addr(skb, NHA_GATEWAY, &fib6_nh->fib_nh_gw6))
755 goto nla_put_failure;
759 if (nhi->fib_nhc.nhc_lwtstate &&
760 lwtunnel_fill_encap(skb, nhi->fib_nhc.nhc_lwtstate,
761 NHA_ENCAP, NHA_ENCAP_TYPE) < 0)
762 goto nla_put_failure;
769 nlmsg_cancel(skb, nlh);
773 static size_t nh_nlmsg_size_grp_res(struct nh_group *nhg)
775 return nla_total_size(0) + /* NHA_RES_GROUP */
776 nla_total_size(2) + /* NHA_RES_GROUP_BUCKETS */
777 nla_total_size(4) + /* NHA_RES_GROUP_IDLE_TIMER */
778 nla_total_size(4) + /* NHA_RES_GROUP_UNBALANCED_TIMER */
779 nla_total_size_64bit(8);/* NHA_RES_GROUP_UNBALANCED_TIME */
782 static size_t nh_nlmsg_size_grp(struct nexthop *nh)
784 struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
785 size_t sz = sizeof(struct nexthop_grp) * nhg->num_nh;
786 size_t tot = nla_total_size(sz) +
787 nla_total_size(2); /* NHA_GROUP_TYPE */
790 tot += nh_nlmsg_size_grp_res(nhg);
795 static size_t nh_nlmsg_size_single(struct nexthop *nh)
797 struct nh_info *nhi = rtnl_dereference(nh->nh_info);
800 /* covers NHA_BLACKHOLE since NHA_OIF and BLACKHOLE
801 * are mutually exclusive
803 sz = nla_total_size(4); /* NHA_OIF */
805 switch (nhi->family) {
807 if (nhi->fib_nh.fib_nh_gw_family)
808 sz += nla_total_size(4); /* NHA_GATEWAY */
813 if (nhi->fib6_nh.fib_nh_gw_family)
814 sz += nla_total_size(sizeof(const struct in6_addr));
818 if (nhi->fib_nhc.nhc_lwtstate) {
819 sz += lwtunnel_get_encap_size(nhi->fib_nhc.nhc_lwtstate);
820 sz += nla_total_size(2); /* NHA_ENCAP_TYPE */
826 static size_t nh_nlmsg_size(struct nexthop *nh)
828 size_t sz = NLMSG_ALIGN(sizeof(struct nhmsg));
830 sz += nla_total_size(4); /* NHA_ID */
833 sz += nh_nlmsg_size_grp(nh);
835 sz += nh_nlmsg_size_single(nh);
840 static void nexthop_notify(int event, struct nexthop *nh, struct nl_info *info)
842 unsigned int nlflags = info->nlh ? info->nlh->nlmsg_flags : 0;
843 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
847 skb = nlmsg_new(nh_nlmsg_size(nh), gfp_any());
851 err = nh_fill_node(skb, nh, event, info->portid, seq, nlflags);
853 /* -EMSGSIZE implies BUG in nh_nlmsg_size() */
854 WARN_ON(err == -EMSGSIZE);
859 rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_NEXTHOP,
860 info->nlh, gfp_any());
864 rtnl_set_sk_err(info->nl_net, RTNLGRP_NEXTHOP, err);
867 static unsigned long nh_res_bucket_used_time(const struct nh_res_bucket *bucket)
869 return (unsigned long)atomic_long_read(&bucket->used_time);
873 nh_res_bucket_idle_point(const struct nh_res_table *res_table,
874 const struct nh_res_bucket *bucket,
877 unsigned long time = nh_res_bucket_used_time(bucket);
879 /* Bucket was not used since it was migrated. The idle time is now. */
880 if (time == bucket->migrated_time)
883 return time + res_table->idle_timer;
887 nh_res_table_unb_point(const struct nh_res_table *res_table)
889 return res_table->unbalanced_since + res_table->unbalanced_timer;
892 static void nh_res_bucket_set_idle(const struct nh_res_table *res_table,
893 struct nh_res_bucket *bucket)
895 unsigned long now = jiffies;
897 atomic_long_set(&bucket->used_time, (long)now);
898 bucket->migrated_time = now;
901 static void nh_res_bucket_set_busy(struct nh_res_bucket *bucket)
903 atomic_long_set(&bucket->used_time, (long)jiffies);
906 static clock_t nh_res_bucket_idle_time(const struct nh_res_bucket *bucket)
908 unsigned long used_time = nh_res_bucket_used_time(bucket);
910 return jiffies_delta_to_clock_t(jiffies - used_time);
913 static int nh_fill_res_bucket(struct sk_buff *skb, struct nexthop *nh,
914 struct nh_res_bucket *bucket, u16 bucket_index,
915 int event, u32 portid, u32 seq,
916 unsigned int nlflags,
917 struct netlink_ext_ack *extack)
919 struct nh_grp_entry *nhge = nh_res_dereference(bucket->nh_entry);
920 struct nlmsghdr *nlh;
924 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nhm), nlflags);
928 nhm = nlmsg_data(nlh);
929 nhm->nh_family = AF_UNSPEC;
930 nhm->nh_flags = bucket->nh_flags;
931 nhm->nh_protocol = nh->protocol;
935 if (nla_put_u32(skb, NHA_ID, nh->id))
936 goto nla_put_failure;
938 nest = nla_nest_start(skb, NHA_RES_BUCKET);
940 goto nla_put_failure;
942 if (nla_put_u16(skb, NHA_RES_BUCKET_INDEX, bucket_index) ||
943 nla_put_u32(skb, NHA_RES_BUCKET_NH_ID, nhge->nh->id) ||
944 nla_put_u64_64bit(skb, NHA_RES_BUCKET_IDLE_TIME,
945 nh_res_bucket_idle_time(bucket),
947 goto nla_put_failure_nest;
949 nla_nest_end(skb, nest);
953 nla_put_failure_nest:
954 nla_nest_cancel(skb, nest);
956 nlmsg_cancel(skb, nlh);
960 static void nexthop_bucket_notify(struct nh_res_table *res_table,
963 struct nh_res_bucket *bucket = &res_table->nh_buckets[bucket_index];
964 struct nh_grp_entry *nhge = nh_res_dereference(bucket->nh_entry);
965 struct nexthop *nh = nhge->nh_parent;
969 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
973 err = nh_fill_res_bucket(skb, nh, bucket, bucket_index,
974 RTM_NEWNEXTHOPBUCKET, 0, 0, NLM_F_REPLACE,
981 rtnl_notify(skb, nh->net, 0, RTNLGRP_NEXTHOP, NULL, GFP_KERNEL);
985 rtnl_set_sk_err(nh->net, RTNLGRP_NEXTHOP, err);
988 static bool valid_group_nh(struct nexthop *nh, unsigned int npaths,
989 bool *is_fdb, struct netlink_ext_ack *extack)
992 struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
994 /* Nesting groups within groups is not supported. */
995 if (nhg->hash_threshold) {
996 NL_SET_ERR_MSG(extack,
997 "Hash-threshold group can not be a nexthop within a group");
1000 if (nhg->resilient) {
1001 NL_SET_ERR_MSG(extack,
1002 "Resilient group can not be a nexthop within a group");
1005 *is_fdb = nhg->fdb_nh;
1007 struct nh_info *nhi = rtnl_dereference(nh->nh_info);
1009 if (nhi->reject_nh && npaths > 1) {
1010 NL_SET_ERR_MSG(extack,
1011 "Blackhole nexthop can not be used in a group with more than 1 path");
1014 *is_fdb = nhi->fdb_nh;
1020 static int nh_check_attr_fdb_group(struct nexthop *nh, u8 *nh_family,
1021 struct netlink_ext_ack *extack)
1023 struct nh_info *nhi;
1025 nhi = rtnl_dereference(nh->nh_info);
1028 NL_SET_ERR_MSG(extack, "FDB nexthop group can only have fdb nexthops");
1032 if (*nh_family == AF_UNSPEC) {
1033 *nh_family = nhi->family;
1034 } else if (*nh_family != nhi->family) {
1035 NL_SET_ERR_MSG(extack, "FDB nexthop group cannot have mixed family nexthops");
1042 static int nh_check_attr_group(struct net *net,
1043 struct nlattr *tb[], size_t tb_size,
1044 u16 nh_grp_type, struct netlink_ext_ack *extack)
1046 unsigned int len = nla_len(tb[NHA_GROUP]);
1047 u8 nh_family = AF_UNSPEC;
1048 struct nexthop_grp *nhg;
1052 if (!len || len & (sizeof(struct nexthop_grp) - 1)) {
1053 NL_SET_ERR_MSG(extack,
1054 "Invalid length for nexthop group attribute");
1058 /* convert len to number of nexthop ids */
1059 len /= sizeof(*nhg);
1061 nhg = nla_data(tb[NHA_GROUP]);
1062 for (i = 0; i < len; ++i) {
1063 if (nhg[i].resvd1 || nhg[i].resvd2) {
1064 NL_SET_ERR_MSG(extack, "Reserved fields in nexthop_grp must be 0");
1067 if (nhg[i].weight > 254) {
1068 NL_SET_ERR_MSG(extack, "Invalid value for weight");
1071 for (j = i + 1; j < len; ++j) {
1072 if (nhg[i].id == nhg[j].id) {
1073 NL_SET_ERR_MSG(extack, "Nexthop id can not be used twice in a group");
1081 nhg = nla_data(tb[NHA_GROUP]);
1082 for (i = 0; i < len; ++i) {
1086 nh = nexthop_find_by_id(net, nhg[i].id);
1088 NL_SET_ERR_MSG(extack, "Invalid nexthop id");
1091 if (!valid_group_nh(nh, len, &is_fdb_nh, extack))
1094 if (nhg_fdb && nh_check_attr_fdb_group(nh, &nh_family, extack))
1097 if (!nhg_fdb && is_fdb_nh) {
1098 NL_SET_ERR_MSG(extack, "Non FDB nexthop group cannot have fdb nexthops");
1102 for (i = NHA_GROUP_TYPE + 1; i < tb_size; ++i) {
1109 if (nh_grp_type == NEXTHOP_GRP_TYPE_RES)
1113 NL_SET_ERR_MSG(extack,
1114 "No other attributes can be set in nexthop groups");
1121 static bool ipv6_good_nh(const struct fib6_nh *nh)
1123 int state = NUD_REACHABLE;
1124 struct neighbour *n;
1128 n = __ipv6_neigh_lookup_noref_stub(nh->fib_nh_dev, &nh->fib_nh_gw6);
1130 state = n->nud_state;
1132 rcu_read_unlock_bh();
1134 return !!(state & NUD_VALID);
1137 static bool ipv4_good_nh(const struct fib_nh *nh)
1139 int state = NUD_REACHABLE;
1140 struct neighbour *n;
1144 n = __ipv4_neigh_lookup_noref(nh->fib_nh_dev,
1145 (__force u32)nh->fib_nh_gw4);
1147 state = n->nud_state;
1149 rcu_read_unlock_bh();
1151 return !!(state & NUD_VALID);
1154 static struct nexthop *nexthop_select_path_hthr(struct nh_group *nhg, int hash)
1156 struct nexthop *rc = NULL;
1159 for (i = 0; i < nhg->num_nh; ++i) {
1160 struct nh_grp_entry *nhge = &nhg->nh_entries[i];
1161 struct nh_info *nhi;
1163 if (hash > atomic_read(&nhge->hthr.upper_bound))
1166 nhi = rcu_dereference(nhge->nh->nh_info);
1170 /* nexthops always check if it is good and does
1171 * not rely on a sysctl for this behavior
1173 switch (nhi->family) {
1175 if (ipv4_good_nh(&nhi->fib_nh))
1179 if (ipv6_good_nh(&nhi->fib6_nh))
1191 static struct nexthop *nexthop_select_path_res(struct nh_group *nhg, int hash)
1193 struct nh_res_table *res_table = rcu_dereference(nhg->res_table);
1194 u16 bucket_index = hash % res_table->num_nh_buckets;
1195 struct nh_res_bucket *bucket;
1196 struct nh_grp_entry *nhge;
1198 /* nexthop_select_path() is expected to return a non-NULL value, so
1199 * skip protocol validation and just hand out whatever there is.
1201 bucket = &res_table->nh_buckets[bucket_index];
1202 nh_res_bucket_set_busy(bucket);
1203 nhge = rcu_dereference(bucket->nh_entry);
1207 struct nexthop *nexthop_select_path(struct nexthop *nh, int hash)
1209 struct nh_group *nhg;
1214 nhg = rcu_dereference(nh->nh_grp);
1215 if (nhg->hash_threshold)
1216 return nexthop_select_path_hthr(nhg, hash);
1217 else if (nhg->resilient)
1218 return nexthop_select_path_res(nhg, hash);
1223 EXPORT_SYMBOL_GPL(nexthop_select_path);
1225 int nexthop_for_each_fib6_nh(struct nexthop *nh,
1226 int (*cb)(struct fib6_nh *nh, void *arg),
1229 struct nh_info *nhi;
1233 struct nh_group *nhg;
1236 nhg = rcu_dereference_rtnl(nh->nh_grp);
1237 for (i = 0; i < nhg->num_nh; i++) {
1238 struct nh_grp_entry *nhge = &nhg->nh_entries[i];
1240 nhi = rcu_dereference_rtnl(nhge->nh->nh_info);
1241 err = cb(&nhi->fib6_nh, arg);
1246 nhi = rcu_dereference_rtnl(nh->nh_info);
1247 err = cb(&nhi->fib6_nh, arg);
1254 EXPORT_SYMBOL_GPL(nexthop_for_each_fib6_nh);
1256 static int check_src_addr(const struct in6_addr *saddr,
1257 struct netlink_ext_ack *extack)
1259 if (!ipv6_addr_any(saddr)) {
1260 NL_SET_ERR_MSG(extack, "IPv6 routes using source address can not use nexthop objects");
1266 int fib6_check_nexthop(struct nexthop *nh, struct fib6_config *cfg,
1267 struct netlink_ext_ack *extack)
1269 struct nh_info *nhi;
1272 /* fib6_src is unique to a fib6_info and limits the ability to cache
1273 * routes in fib6_nh within a nexthop that is potentially shared
1274 * across multiple fib entries. If the config wants to use source
1275 * routing it can not use nexthop objects. mlxsw also does not allow
1276 * fib6_src on routes.
1278 if (cfg && check_src_addr(&cfg->fc_src, extack) < 0)
1282 struct nh_group *nhg;
1284 nhg = rtnl_dereference(nh->nh_grp);
1287 is_fdb_nh = nhg->fdb_nh;
1289 nhi = rtnl_dereference(nh->nh_info);
1290 if (nhi->family == AF_INET)
1292 is_fdb_nh = nhi->fdb_nh;
1296 NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop");
1302 NL_SET_ERR_MSG(extack, "IPv6 routes can not use an IPv4 nexthop");
1305 EXPORT_SYMBOL_GPL(fib6_check_nexthop);
1307 /* if existing nexthop has ipv6 routes linked to it, need
1308 * to verify this new spec works with ipv6
1310 static int fib6_check_nh_list(struct nexthop *old, struct nexthop *new,
1311 struct netlink_ext_ack *extack)
1313 struct fib6_info *f6i;
1315 if (list_empty(&old->f6i_list))
1318 list_for_each_entry(f6i, &old->f6i_list, nh_list) {
1319 if (check_src_addr(&f6i->fib6_src.addr, extack) < 0)
1323 return fib6_check_nexthop(new, NULL, extack);
1326 static int nexthop_check_scope(struct nh_info *nhi, u8 scope,
1327 struct netlink_ext_ack *extack)
1329 if (scope == RT_SCOPE_HOST && nhi->fib_nhc.nhc_gw_family) {
1330 NL_SET_ERR_MSG(extack,
1331 "Route with host scope can not have a gateway");
1335 if (nhi->fib_nhc.nhc_flags & RTNH_F_ONLINK && scope >= RT_SCOPE_LINK) {
1336 NL_SET_ERR_MSG(extack, "Scope mismatch with nexthop");
1343 /* Invoked by fib add code to verify nexthop by id is ok with
1344 * config for prefix; parts of fib_check_nh not done when nexthop
1347 int fib_check_nexthop(struct nexthop *nh, u8 scope,
1348 struct netlink_ext_ack *extack)
1350 struct nh_info *nhi;
1354 struct nh_group *nhg;
1356 nhg = rtnl_dereference(nh->nh_grp);
1358 NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop");
1363 if (scope == RT_SCOPE_HOST) {
1364 NL_SET_ERR_MSG(extack, "Route with host scope can not have multiple nexthops");
1369 /* all nexthops in a group have the same scope */
1370 nhi = rtnl_dereference(nhg->nh_entries[0].nh->nh_info);
1371 err = nexthop_check_scope(nhi, scope, extack);
1373 nhi = rtnl_dereference(nh->nh_info);
1375 NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop");
1379 err = nexthop_check_scope(nhi, scope, extack);
1386 static int fib_check_nh_list(struct nexthop *old, struct nexthop *new,
1387 struct netlink_ext_ack *extack)
1389 struct fib_info *fi;
1391 list_for_each_entry(fi, &old->fi_list, nh_list) {
1394 err = fib_check_nexthop(new, fi->fib_scope, extack);
1401 static bool nh_res_nhge_is_balanced(const struct nh_grp_entry *nhge)
1403 return nhge->res.count_buckets == nhge->res.wants_buckets;
1406 static bool nh_res_nhge_is_ow(const struct nh_grp_entry *nhge)
1408 return nhge->res.count_buckets > nhge->res.wants_buckets;
1411 static bool nh_res_nhge_is_uw(const struct nh_grp_entry *nhge)
1413 return nhge->res.count_buckets < nhge->res.wants_buckets;
1416 static bool nh_res_table_is_balanced(const struct nh_res_table *res_table)
1418 return list_empty(&res_table->uw_nh_entries);
1421 static void nh_res_bucket_unset_nh(struct nh_res_bucket *bucket)
1423 struct nh_grp_entry *nhge;
1425 if (bucket->occupied) {
1426 nhge = nh_res_dereference(bucket->nh_entry);
1427 nhge->res.count_buckets--;
1428 bucket->occupied = false;
1432 static void nh_res_bucket_set_nh(struct nh_res_bucket *bucket,
1433 struct nh_grp_entry *nhge)
1435 nh_res_bucket_unset_nh(bucket);
1437 bucket->occupied = true;
1438 rcu_assign_pointer(bucket->nh_entry, nhge);
1439 nhge->res.count_buckets++;
1442 static bool nh_res_bucket_should_migrate(struct nh_res_table *res_table,
1443 struct nh_res_bucket *bucket,
1444 unsigned long *deadline, bool *force)
1446 unsigned long now = jiffies;
1447 struct nh_grp_entry *nhge;
1448 unsigned long idle_point;
1450 if (!bucket->occupied) {
1451 /* The bucket is not occupied, its NHGE pointer is either
1452 * NULL or obsolete. We _have to_ migrate: set force.
1458 nhge = nh_res_dereference(bucket->nh_entry);
1460 /* If the bucket is populated by an underweight or balanced
1461 * nexthop, do not migrate.
1463 if (!nh_res_nhge_is_ow(nhge))
1466 /* At this point we know that the bucket is populated with an
1467 * overweight nexthop. It needs to be migrated to a new nexthop if
1468 * the idle timer of unbalanced timer expired.
1471 idle_point = nh_res_bucket_idle_point(res_table, bucket, now);
1472 if (time_after_eq(now, idle_point)) {
1473 /* The bucket is idle. We _can_ migrate: unset force. */
1478 /* Unbalanced timer of 0 means "never force". */
1479 if (res_table->unbalanced_timer) {
1480 unsigned long unb_point;
1482 unb_point = nh_res_table_unb_point(res_table);
1483 if (time_after(now, unb_point)) {
1484 /* The bucket is not idle, but the unbalanced timer
1485 * expired. We _can_ migrate, but set force anyway,
1486 * so that drivers know to ignore activity reports
1493 nh_res_time_set_deadline(unb_point, deadline);
1496 nh_res_time_set_deadline(idle_point, deadline);
1500 static bool nh_res_bucket_migrate(struct nh_res_table *res_table,
1501 u16 bucket_index, bool notify,
1502 bool notify_nl, bool force)
1504 struct nh_res_bucket *bucket = &res_table->nh_buckets[bucket_index];
1505 struct nh_grp_entry *new_nhge;
1506 struct netlink_ext_ack extack;
1509 new_nhge = list_first_entry_or_null(&res_table->uw_nh_entries,
1510 struct nh_grp_entry,
1512 if (WARN_ON_ONCE(!new_nhge))
1513 /* If this function is called, "bucket" is either not
1514 * occupied, or it belongs to a next hop that is
1515 * overweight. In either case, there ought to be a
1516 * corresponding underweight next hop.
1521 struct nh_grp_entry *old_nhge;
1523 old_nhge = nh_res_dereference(bucket->nh_entry);
1524 err = call_nexthop_res_bucket_notifiers(res_table->net,
1526 bucket_index, force,
1528 new_nhge->nh, &extack);
1530 pr_err_ratelimited("%s\n", extack._msg);
1533 /* It is not possible to veto a forced replacement, so
1534 * just clear the hardware flags from the nexthop
1535 * bucket to indicate to user space that this bucket is
1536 * not correctly populated in hardware.
1538 bucket->nh_flags &= ~(RTNH_F_OFFLOAD | RTNH_F_TRAP);
1542 nh_res_bucket_set_nh(bucket, new_nhge);
1543 nh_res_bucket_set_idle(res_table, bucket);
1546 nexthop_bucket_notify(res_table, bucket_index);
1548 if (nh_res_nhge_is_balanced(new_nhge))
1549 list_del(&new_nhge->res.uw_nh_entry);
1553 #define NH_RES_UPKEEP_DW_MINIMUM_INTERVAL (HZ / 2)
1555 static void nh_res_table_upkeep(struct nh_res_table *res_table,
1556 bool notify, bool notify_nl)
1558 unsigned long now = jiffies;
1559 unsigned long deadline;
1562 /* Deadline is the next time that upkeep should be run. It is the
1563 * earliest time at which one of the buckets might be migrated.
1564 * Start at the most pessimistic estimate: either unbalanced_timer
1565 * from now, or if there is none, idle_timer from now. For each
1566 * encountered time point, call nh_res_time_set_deadline() to
1567 * refine the estimate.
1569 if (res_table->unbalanced_timer)
1570 deadline = now + res_table->unbalanced_timer;
1572 deadline = now + res_table->idle_timer;
1574 for (i = 0; i < res_table->num_nh_buckets; i++) {
1575 struct nh_res_bucket *bucket = &res_table->nh_buckets[i];
1578 if (nh_res_bucket_should_migrate(res_table, bucket,
1579 &deadline, &force)) {
1580 if (!nh_res_bucket_migrate(res_table, i, notify,
1581 notify_nl, force)) {
1582 unsigned long idle_point;
1584 /* A driver can override the migration
1585 * decision if the HW reports that the
1586 * bucket is actually not idle. Therefore
1587 * remark the bucket as busy again and
1588 * update the deadline.
1590 nh_res_bucket_set_busy(bucket);
1591 idle_point = nh_res_bucket_idle_point(res_table,
1594 nh_res_time_set_deadline(idle_point, &deadline);
1599 /* If the group is still unbalanced, schedule the next upkeep to
1600 * either the deadline computed above, or the minimum deadline,
1601 * whichever comes later.
1603 if (!nh_res_table_is_balanced(res_table)) {
1604 unsigned long now = jiffies;
1605 unsigned long min_deadline;
1607 min_deadline = now + NH_RES_UPKEEP_DW_MINIMUM_INTERVAL;
1608 if (time_before(deadline, min_deadline))
1609 deadline = min_deadline;
1611 queue_delayed_work(system_power_efficient_wq,
1612 &res_table->upkeep_dw, deadline - now);
1616 static void nh_res_table_upkeep_dw(struct work_struct *work)
1618 struct delayed_work *dw = to_delayed_work(work);
1619 struct nh_res_table *res_table;
1621 res_table = container_of(dw, struct nh_res_table, upkeep_dw);
1622 nh_res_table_upkeep(res_table, true, true);
1625 static void nh_res_table_cancel_upkeep(struct nh_res_table *res_table)
1627 cancel_delayed_work_sync(&res_table->upkeep_dw);
1630 static void nh_res_group_rebalance(struct nh_group *nhg,
1631 struct nh_res_table *res_table)
1633 int prev_upper_bound = 0;
1638 INIT_LIST_HEAD(&res_table->uw_nh_entries);
1640 for (i = 0; i < nhg->num_nh; ++i)
1641 total += nhg->nh_entries[i].weight;
1643 for (i = 0; i < nhg->num_nh; ++i) {
1644 struct nh_grp_entry *nhge = &nhg->nh_entries[i];
1648 upper_bound = DIV_ROUND_CLOSEST(res_table->num_nh_buckets * w,
1650 nhge->res.wants_buckets = upper_bound - prev_upper_bound;
1651 prev_upper_bound = upper_bound;
1653 if (nh_res_nhge_is_uw(nhge)) {
1654 if (list_empty(&res_table->uw_nh_entries))
1655 res_table->unbalanced_since = jiffies;
1656 list_add(&nhge->res.uw_nh_entry,
1657 &res_table->uw_nh_entries);
1662 /* Migrate buckets in res_table so that they reference NHGE's from NHG with
1663 * the right NH ID. Set those buckets that do not have a corresponding NHGE
1664 * entry in NHG as not occupied.
1666 static void nh_res_table_migrate_buckets(struct nh_res_table *res_table,
1667 struct nh_group *nhg)
1671 for (i = 0; i < res_table->num_nh_buckets; i++) {
1672 struct nh_res_bucket *bucket = &res_table->nh_buckets[i];
1673 u32 id = rtnl_dereference(bucket->nh_entry)->nh->id;
1677 for (j = 0; j < nhg->num_nh; j++) {
1678 struct nh_grp_entry *nhge = &nhg->nh_entries[j];
1680 if (nhge->nh->id == id) {
1681 nh_res_bucket_set_nh(bucket, nhge);
1688 nh_res_bucket_unset_nh(bucket);
1692 static void replace_nexthop_grp_res(struct nh_group *oldg,
1693 struct nh_group *newg)
1695 /* For NH group replacement, the new NHG might only have a stub
1696 * hash table with 0 buckets, because the number of buckets was not
1697 * specified. For NH removal, oldg and newg both reference the same
1698 * res_table. So in any case, in the following, we want to work
1699 * with oldg->res_table.
1701 struct nh_res_table *old_res_table = rtnl_dereference(oldg->res_table);
1702 unsigned long prev_unbalanced_since = old_res_table->unbalanced_since;
1703 bool prev_has_uw = !list_empty(&old_res_table->uw_nh_entries);
1705 nh_res_table_cancel_upkeep(old_res_table);
1706 nh_res_table_migrate_buckets(old_res_table, newg);
1707 nh_res_group_rebalance(newg, old_res_table);
1708 if (prev_has_uw && !list_empty(&old_res_table->uw_nh_entries))
1709 old_res_table->unbalanced_since = prev_unbalanced_since;
1710 nh_res_table_upkeep(old_res_table, true, false);
1713 static void nh_hthr_group_rebalance(struct nh_group *nhg)
1719 for (i = 0; i < nhg->num_nh; ++i)
1720 total += nhg->nh_entries[i].weight;
1722 for (i = 0; i < nhg->num_nh; ++i) {
1723 struct nh_grp_entry *nhge = &nhg->nh_entries[i];
1727 upper_bound = DIV_ROUND_CLOSEST_ULL((u64)w << 31, total) - 1;
1728 atomic_set(&nhge->hthr.upper_bound, upper_bound);
1732 static void remove_nh_grp_entry(struct net *net, struct nh_grp_entry *nhge,
1733 struct nl_info *nlinfo)
1735 struct nh_grp_entry *nhges, *new_nhges;
1736 struct nexthop *nhp = nhge->nh_parent;
1737 struct netlink_ext_ack extack;
1738 struct nexthop *nh = nhge->nh;
1739 struct nh_group *nhg, *newg;
1744 nhg = rtnl_dereference(nhp->nh_grp);
1747 /* last entry, keep it visible and remove the parent */
1748 if (nhg->num_nh == 1) {
1749 remove_nexthop(net, nhp, nlinfo);
1753 newg->has_v4 = false;
1754 newg->is_multipath = nhg->is_multipath;
1755 newg->hash_threshold = nhg->hash_threshold;
1756 newg->resilient = nhg->resilient;
1757 newg->fdb_nh = nhg->fdb_nh;
1758 newg->num_nh = nhg->num_nh;
1760 /* copy old entries to new except the one getting removed */
1761 nhges = nhg->nh_entries;
1762 new_nhges = newg->nh_entries;
1763 for (i = 0, j = 0; i < nhg->num_nh; ++i) {
1764 struct nh_info *nhi;
1766 /* current nexthop getting removed */
1767 if (nhg->nh_entries[i].nh == nh) {
1772 nhi = rtnl_dereference(nhges[i].nh->nh_info);
1773 if (nhi->family == AF_INET)
1774 newg->has_v4 = true;
1776 list_del(&nhges[i].nh_list);
1777 new_nhges[j].nh_parent = nhges[i].nh_parent;
1778 new_nhges[j].nh = nhges[i].nh;
1779 new_nhges[j].weight = nhges[i].weight;
1780 list_add(&new_nhges[j].nh_list, &new_nhges[j].nh->grp_list);
1784 if (newg->hash_threshold)
1785 nh_hthr_group_rebalance(newg);
1786 else if (newg->resilient)
1787 replace_nexthop_grp_res(nhg, newg);
1789 rcu_assign_pointer(nhp->nh_grp, newg);
1791 list_del(&nhge->nh_list);
1792 nexthop_put(nhge->nh);
1794 /* Removal of a NH from a resilient group is notified through
1795 * bucket notifications.
1797 if (newg->hash_threshold) {
1798 err = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, nhp,
1801 pr_err("%s\n", extack._msg);
1805 nexthop_notify(RTM_NEWNEXTHOP, nhp, nlinfo);
1808 static void remove_nexthop_from_groups(struct net *net, struct nexthop *nh,
1809 struct nl_info *nlinfo)
1811 struct nh_grp_entry *nhge, *tmp;
1813 list_for_each_entry_safe(nhge, tmp, &nh->grp_list, nh_list)
1814 remove_nh_grp_entry(net, nhge, nlinfo);
1816 /* make sure all see the newly published array before releasing rtnl */
1820 static void remove_nexthop_group(struct nexthop *nh, struct nl_info *nlinfo)
1822 struct nh_group *nhg = rcu_dereference_rtnl(nh->nh_grp);
1823 struct nh_res_table *res_table;
1824 int i, num_nh = nhg->num_nh;
1826 for (i = 0; i < num_nh; ++i) {
1827 struct nh_grp_entry *nhge = &nhg->nh_entries[i];
1829 if (WARN_ON(!nhge->nh))
1832 list_del_init(&nhge->nh_list);
1835 if (nhg->resilient) {
1836 res_table = rtnl_dereference(nhg->res_table);
1837 nh_res_table_cancel_upkeep(res_table);
1841 /* not called for nexthop replace */
1842 static void __remove_nexthop_fib(struct net *net, struct nexthop *nh)
1844 struct fib6_info *f6i, *tmp;
1845 bool do_flush = false;
1846 struct fib_info *fi;
1848 list_for_each_entry(fi, &nh->fi_list, nh_list) {
1849 fi->fib_flags |= RTNH_F_DEAD;
1855 /* ip6_del_rt removes the entry from this list hence the _safe */
1856 list_for_each_entry_safe(f6i, tmp, &nh->f6i_list, nh_list) {
1857 /* __ip6_del_rt does a release, so do a hold here */
1858 fib6_info_hold(f6i);
1859 ipv6_stub->ip6_del_rt(net, f6i,
1860 !READ_ONCE(net->ipv4.sysctl_nexthop_compat_mode));
1864 static void __remove_nexthop(struct net *net, struct nexthop *nh,
1865 struct nl_info *nlinfo)
1867 __remove_nexthop_fib(net, nh);
1870 remove_nexthop_group(nh, nlinfo);
1872 struct nh_info *nhi;
1874 nhi = rtnl_dereference(nh->nh_info);
1875 if (nhi->fib_nhc.nhc_dev)
1876 hlist_del(&nhi->dev_hash);
1878 remove_nexthop_from_groups(net, nh, nlinfo);
1882 static void remove_nexthop(struct net *net, struct nexthop *nh,
1883 struct nl_info *nlinfo)
1885 call_nexthop_notifiers(net, NEXTHOP_EVENT_DEL, nh, NULL);
1887 /* remove from the tree */
1888 rb_erase(&nh->rb_node, &net->nexthop.rb_root);
1891 nexthop_notify(RTM_DELNEXTHOP, nh, nlinfo);
1893 __remove_nexthop(net, nh, nlinfo);
1894 nh_base_seq_inc(net);
1899 /* if any FIB entries reference this nexthop, any dst entries
1900 * need to be regenerated
1902 static void nh_rt_cache_flush(struct net *net, struct nexthop *nh,
1903 struct nexthop *replaced_nh)
1905 struct fib6_info *f6i;
1906 struct nh_group *nhg;
1909 if (!list_empty(&nh->fi_list))
1910 rt_cache_flush(net);
1912 list_for_each_entry(f6i, &nh->f6i_list, nh_list)
1913 ipv6_stub->fib6_update_sernum(net, f6i);
1915 /* if an IPv6 group was replaced, we have to release all old
1916 * dsts to make sure all refcounts are released
1918 if (!replaced_nh->is_group)
1921 /* new dsts must use only the new nexthop group */
1924 nhg = rtnl_dereference(replaced_nh->nh_grp);
1925 for (i = 0; i < nhg->num_nh; i++) {
1926 struct nh_grp_entry *nhge = &nhg->nh_entries[i];
1927 struct nh_info *nhi = rtnl_dereference(nhge->nh->nh_info);
1929 if (nhi->family == AF_INET6)
1930 ipv6_stub->fib6_nh_release_dsts(&nhi->fib6_nh);
1934 static int replace_nexthop_grp(struct net *net, struct nexthop *old,
1935 struct nexthop *new, const struct nh_config *cfg,
1936 struct netlink_ext_ack *extack)
1938 struct nh_res_table *tmp_table = NULL;
1939 struct nh_res_table *new_res_table;
1940 struct nh_res_table *old_res_table;
1941 struct nh_group *oldg, *newg;
1944 if (!new->is_group) {
1945 NL_SET_ERR_MSG(extack, "Can not replace a nexthop group with a nexthop.");
1949 oldg = rtnl_dereference(old->nh_grp);
1950 newg = rtnl_dereference(new->nh_grp);
1952 if (newg->hash_threshold != oldg->hash_threshold) {
1953 NL_SET_ERR_MSG(extack, "Can not replace a nexthop group with one of a different type.");
1957 if (newg->hash_threshold) {
1958 err = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, new,
1962 } else if (newg->resilient) {
1963 new_res_table = rtnl_dereference(newg->res_table);
1964 old_res_table = rtnl_dereference(oldg->res_table);
1966 /* Accept if num_nh_buckets was not given, but if it was
1967 * given, demand that the value be correct.
1969 if (cfg->nh_grp_res_has_num_buckets &&
1970 cfg->nh_grp_res_num_buckets !=
1971 old_res_table->num_nh_buckets) {
1972 NL_SET_ERR_MSG(extack, "Can not change number of buckets of a resilient nexthop group.");
1976 /* Emit a pre-replace notification so that listeners could veto
1977 * a potentially unsupported configuration. Otherwise,
1978 * individual bucket replacement notifications would need to be
1979 * vetoed, which is something that should only happen if the
1980 * bucket is currently active.
1982 err = call_nexthop_res_table_notifiers(net, new, extack);
1986 if (cfg->nh_grp_res_has_idle_timer)
1987 old_res_table->idle_timer = cfg->nh_grp_res_idle_timer;
1988 if (cfg->nh_grp_res_has_unbalanced_timer)
1989 old_res_table->unbalanced_timer =
1990 cfg->nh_grp_res_unbalanced_timer;
1992 replace_nexthop_grp_res(oldg, newg);
1994 tmp_table = new_res_table;
1995 rcu_assign_pointer(newg->res_table, old_res_table);
1996 rcu_assign_pointer(newg->spare->res_table, old_res_table);
1999 /* update parents - used by nexthop code for cleanup */
2000 for (i = 0; i < newg->num_nh; i++)
2001 newg->nh_entries[i].nh_parent = old;
2003 rcu_assign_pointer(old->nh_grp, newg);
2005 if (newg->resilient) {
2006 /* Make sure concurrent readers are not using 'oldg' anymore. */
2008 rcu_assign_pointer(oldg->res_table, tmp_table);
2009 rcu_assign_pointer(oldg->spare->res_table, tmp_table);
2012 for (i = 0; i < oldg->num_nh; i++)
2013 oldg->nh_entries[i].nh_parent = new;
2015 rcu_assign_pointer(new->nh_grp, oldg);
2020 static void nh_group_v4_update(struct nh_group *nhg)
2022 struct nh_grp_entry *nhges;
2023 bool has_v4 = false;
2026 nhges = nhg->nh_entries;
2027 for (i = 0; i < nhg->num_nh; i++) {
2028 struct nh_info *nhi;
2030 nhi = rtnl_dereference(nhges[i].nh->nh_info);
2031 if (nhi->family == AF_INET)
2034 nhg->has_v4 = has_v4;
2037 static int replace_nexthop_single_notify_res(struct net *net,
2038 struct nh_res_table *res_table,
2039 struct nexthop *old,
2040 struct nh_info *oldi,
2041 struct nh_info *newi,
2042 struct netlink_ext_ack *extack)
2044 u32 nhg_id = res_table->nhg_id;
2048 for (i = 0; i < res_table->num_nh_buckets; i++) {
2049 struct nh_res_bucket *bucket = &res_table->nh_buckets[i];
2050 struct nh_grp_entry *nhge;
2052 nhge = rtnl_dereference(bucket->nh_entry);
2053 if (nhge->nh == old) {
2054 err = __call_nexthop_res_bucket_notifiers(net, nhg_id,
2067 struct nh_res_bucket *bucket = &res_table->nh_buckets[i];
2068 struct nh_grp_entry *nhge;
2070 nhge = rtnl_dereference(bucket->nh_entry);
2071 if (nhge->nh == old)
2072 __call_nexthop_res_bucket_notifiers(net, nhg_id, i,
2079 static int replace_nexthop_single_notify(struct net *net,
2080 struct nexthop *group_nh,
2081 struct nexthop *old,
2082 struct nh_info *oldi,
2083 struct nh_info *newi,
2084 struct netlink_ext_ack *extack)
2086 struct nh_group *nhg = rtnl_dereference(group_nh->nh_grp);
2087 struct nh_res_table *res_table;
2089 if (nhg->hash_threshold) {
2090 return call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE,
2092 } else if (nhg->resilient) {
2093 res_table = rtnl_dereference(nhg->res_table);
2094 return replace_nexthop_single_notify_res(net, res_table,
2102 static int replace_nexthop_single(struct net *net, struct nexthop *old,
2103 struct nexthop *new,
2104 struct netlink_ext_ack *extack)
2106 u8 old_protocol, old_nh_flags;
2107 struct nh_info *oldi, *newi;
2108 struct nh_grp_entry *nhge;
2111 if (new->is_group) {
2112 NL_SET_ERR_MSG(extack, "Can not replace a nexthop with a nexthop group.");
2116 err = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, new, extack);
2120 /* Hardware flags were set on 'old' as 'new' is not in the red-black
2121 * tree. Therefore, inherit the flags from 'old' to 'new'.
2123 new->nh_flags |= old->nh_flags & (RTNH_F_OFFLOAD | RTNH_F_TRAP);
2125 oldi = rtnl_dereference(old->nh_info);
2126 newi = rtnl_dereference(new->nh_info);
2128 newi->nh_parent = old;
2129 oldi->nh_parent = new;
2131 old_protocol = old->protocol;
2132 old_nh_flags = old->nh_flags;
2134 old->protocol = new->protocol;
2135 old->nh_flags = new->nh_flags;
2137 rcu_assign_pointer(old->nh_info, newi);
2138 rcu_assign_pointer(new->nh_info, oldi);
2140 /* Send a replace notification for all the groups using the nexthop. */
2141 list_for_each_entry(nhge, &old->grp_list, nh_list) {
2142 struct nexthop *nhp = nhge->nh_parent;
2144 err = replace_nexthop_single_notify(net, nhp, old, oldi, newi,
2150 /* When replacing an IPv4 nexthop with an IPv6 nexthop, potentially
2151 * update IPv4 indication in all the groups using the nexthop.
2153 if (oldi->family == AF_INET && newi->family == AF_INET6) {
2154 list_for_each_entry(nhge, &old->grp_list, nh_list) {
2155 struct nexthop *nhp = nhge->nh_parent;
2156 struct nh_group *nhg;
2158 nhg = rtnl_dereference(nhp->nh_grp);
2159 nh_group_v4_update(nhg);
2166 rcu_assign_pointer(new->nh_info, newi);
2167 rcu_assign_pointer(old->nh_info, oldi);
2168 old->nh_flags = old_nh_flags;
2169 old->protocol = old_protocol;
2170 oldi->nh_parent = old;
2171 newi->nh_parent = new;
2172 list_for_each_entry_continue_reverse(nhge, &old->grp_list, nh_list) {
2173 struct nexthop *nhp = nhge->nh_parent;
2175 replace_nexthop_single_notify(net, nhp, old, newi, oldi, NULL);
2177 call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, old, extack);
2181 static void __nexthop_replace_notify(struct net *net, struct nexthop *nh,
2182 struct nl_info *info)
2184 struct fib6_info *f6i;
2186 if (!list_empty(&nh->fi_list)) {
2187 struct fib_info *fi;
2189 /* expectation is a few fib_info per nexthop and then
2190 * a lot of routes per fib_info. So mark the fib_info
2191 * and then walk the fib tables once
2193 list_for_each_entry(fi, &nh->fi_list, nh_list)
2194 fi->nh_updated = true;
2196 fib_info_notify_update(net, info);
2198 list_for_each_entry(fi, &nh->fi_list, nh_list)
2199 fi->nh_updated = false;
2202 list_for_each_entry(f6i, &nh->f6i_list, nh_list)
2203 ipv6_stub->fib6_rt_update(net, f6i, info);
2206 /* send RTM_NEWROUTE with REPLACE flag set for all FIB entries
2207 * linked to this nexthop and for all groups that the nexthop
2210 static void nexthop_replace_notify(struct net *net, struct nexthop *nh,
2211 struct nl_info *info)
2213 struct nh_grp_entry *nhge;
2215 __nexthop_replace_notify(net, nh, info);
2217 list_for_each_entry(nhge, &nh->grp_list, nh_list)
2218 __nexthop_replace_notify(net, nhge->nh_parent, info);
2221 static int replace_nexthop(struct net *net, struct nexthop *old,
2222 struct nexthop *new, const struct nh_config *cfg,
2223 struct netlink_ext_ack *extack)
2225 bool new_is_reject = false;
2226 struct nh_grp_entry *nhge;
2229 /* check that existing FIB entries are ok with the
2230 * new nexthop definition
2232 err = fib_check_nh_list(old, new, extack);
2236 err = fib6_check_nh_list(old, new, extack);
2240 if (!new->is_group) {
2241 struct nh_info *nhi = rtnl_dereference(new->nh_info);
2243 new_is_reject = nhi->reject_nh;
2246 list_for_each_entry(nhge, &old->grp_list, nh_list) {
2247 /* if new nexthop is a blackhole, any groups using this
2248 * nexthop cannot have more than 1 path
2250 if (new_is_reject &&
2251 nexthop_num_path(nhge->nh_parent) > 1) {
2252 NL_SET_ERR_MSG(extack, "Blackhole nexthop can not be a member of a group with more than one path");
2256 err = fib_check_nh_list(nhge->nh_parent, new, extack);
2260 err = fib6_check_nh_list(nhge->nh_parent, new, extack);
2266 err = replace_nexthop_grp(net, old, new, cfg, extack);
2268 err = replace_nexthop_single(net, old, new, extack);
2271 nh_rt_cache_flush(net, old, new);
2273 __remove_nexthop(net, new, NULL);
2280 /* called with rtnl_lock held */
2281 static int insert_nexthop(struct net *net, struct nexthop *new_nh,
2282 struct nh_config *cfg, struct netlink_ext_ack *extack)
2284 struct rb_node **pp, *parent = NULL, *next;
2285 struct rb_root *root = &net->nexthop.rb_root;
2286 bool replace = !!(cfg->nlflags & NLM_F_REPLACE);
2287 bool create = !!(cfg->nlflags & NLM_F_CREATE);
2288 u32 new_id = new_nh->id;
2289 int replace_notify = 0;
2292 pp = &root->rb_node;
2302 nh = rb_entry(parent, struct nexthop, rb_node);
2303 if (new_id < nh->id) {
2304 pp = &next->rb_left;
2305 } else if (new_id > nh->id) {
2306 pp = &next->rb_right;
2307 } else if (replace) {
2308 rc = replace_nexthop(net, nh, new_nh, cfg, extack);
2310 new_nh = nh; /* send notification with old nh */
2315 /* id already exists and not a replace */
2320 if (replace && !create) {
2321 NL_SET_ERR_MSG(extack, "Replace specified without create and no entry exists");
2326 if (new_nh->is_group) {
2327 struct nh_group *nhg = rtnl_dereference(new_nh->nh_grp);
2328 struct nh_res_table *res_table;
2330 if (nhg->resilient) {
2331 res_table = rtnl_dereference(nhg->res_table);
2333 /* Not passing the number of buckets is OK when
2334 * replacing, but not when creating a new group.
2336 if (!cfg->nh_grp_res_has_num_buckets) {
2337 NL_SET_ERR_MSG(extack, "Number of buckets not specified for nexthop group insertion");
2342 nh_res_group_rebalance(nhg, res_table);
2344 /* Do not send bucket notifications, we do full
2345 * notification below.
2347 nh_res_table_upkeep(res_table, false, false);
2351 rb_link_node_rcu(&new_nh->rb_node, parent, pp);
2352 rb_insert_color(&new_nh->rb_node, root);
2354 /* The initial insertion is a full notification for hash-threshold as
2355 * well as resilient groups.
2357 rc = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, new_nh, extack);
2359 rb_erase(&new_nh->rb_node, &net->nexthop.rb_root);
2363 nh_base_seq_inc(net);
2364 nexthop_notify(RTM_NEWNEXTHOP, new_nh, &cfg->nlinfo);
2365 if (replace_notify &&
2366 READ_ONCE(net->ipv4.sysctl_nexthop_compat_mode))
2367 nexthop_replace_notify(net, new_nh, &cfg->nlinfo);
2374 /* remove all nexthops tied to a device being deleted */
2375 static void nexthop_flush_dev(struct net_device *dev, unsigned long event)
2377 unsigned int hash = nh_dev_hashfn(dev->ifindex);
2378 struct net *net = dev_net(dev);
2379 struct hlist_head *head = &net->nexthop.devhash[hash];
2380 struct hlist_node *n;
2381 struct nh_info *nhi;
2383 hlist_for_each_entry_safe(nhi, n, head, dev_hash) {
2384 if (nhi->fib_nhc.nhc_dev != dev)
2387 if (nhi->reject_nh &&
2388 (event == NETDEV_DOWN || event == NETDEV_CHANGE))
2391 remove_nexthop(net, nhi->nh_parent, NULL);
2395 /* rtnl; called when net namespace is deleted */
2396 static void flush_all_nexthops(struct net *net)
2398 struct rb_root *root = &net->nexthop.rb_root;
2399 struct rb_node *node;
2402 while ((node = rb_first(root))) {
2403 nh = rb_entry(node, struct nexthop, rb_node);
2404 remove_nexthop(net, nh, NULL);
2409 static struct nexthop *nexthop_create_group(struct net *net,
2410 struct nh_config *cfg)
2412 struct nlattr *grps_attr = cfg->nh_grp;
2413 struct nexthop_grp *entry = nla_data(grps_attr);
2414 u16 num_nh = nla_len(grps_attr) / sizeof(*entry);
2415 struct nh_group *nhg;
2420 if (WARN_ON(!num_nh))
2421 return ERR_PTR(-EINVAL);
2423 nh = nexthop_alloc();
2425 return ERR_PTR(-ENOMEM);
2429 nhg = nexthop_grp_alloc(num_nh);
2432 return ERR_PTR(-ENOMEM);
2435 /* spare group used for removals */
2436 nhg->spare = nexthop_grp_alloc(num_nh);
2440 return ERR_PTR(-ENOMEM);
2442 nhg->spare->spare = nhg;
2444 for (i = 0; i < nhg->num_nh; ++i) {
2445 struct nexthop *nhe;
2446 struct nh_info *nhi;
2448 nhe = nexthop_find_by_id(net, entry[i].id);
2449 if (!nexthop_get(nhe)) {
2454 nhi = rtnl_dereference(nhe->nh_info);
2455 if (nhi->family == AF_INET)
2458 nhg->nh_entries[i].nh = nhe;
2459 nhg->nh_entries[i].weight = entry[i].weight + 1;
2460 list_add(&nhg->nh_entries[i].nh_list, &nhe->grp_list);
2461 nhg->nh_entries[i].nh_parent = nh;
2464 if (cfg->nh_grp_type == NEXTHOP_GRP_TYPE_MPATH) {
2465 nhg->hash_threshold = 1;
2466 nhg->is_multipath = true;
2467 } else if (cfg->nh_grp_type == NEXTHOP_GRP_TYPE_RES) {
2468 struct nh_res_table *res_table;
2470 res_table = nexthop_res_table_alloc(net, cfg->nh_id, cfg);
2476 rcu_assign_pointer(nhg->spare->res_table, res_table);
2477 rcu_assign_pointer(nhg->res_table, res_table);
2478 nhg->resilient = true;
2479 nhg->is_multipath = true;
2482 WARN_ON_ONCE(nhg->hash_threshold + nhg->resilient != 1);
2484 if (nhg->hash_threshold)
2485 nh_hthr_group_rebalance(nhg);
2490 rcu_assign_pointer(nh->nh_grp, nhg);
2495 for (i--; i >= 0; --i) {
2496 list_del(&nhg->nh_entries[i].nh_list);
2497 nexthop_put(nhg->nh_entries[i].nh);
2504 return ERR_PTR(err);
2507 static int nh_create_ipv4(struct net *net, struct nexthop *nh,
2508 struct nh_info *nhi, struct nh_config *cfg,
2509 struct netlink_ext_ack *extack)
2511 struct fib_nh *fib_nh = &nhi->fib_nh;
2512 struct fib_config fib_cfg = {
2513 .fc_oif = cfg->nh_ifindex,
2514 .fc_gw4 = cfg->gw.ipv4,
2515 .fc_gw_family = cfg->gw.ipv4 ? AF_INET : 0,
2516 .fc_flags = cfg->nh_flags,
2517 .fc_nlinfo = cfg->nlinfo,
2518 .fc_encap = cfg->nh_encap,
2519 .fc_encap_type = cfg->nh_encap_type,
2521 u32 tb_id = (cfg->dev ? l3mdev_fib_table(cfg->dev) : RT_TABLE_MAIN);
2524 err = fib_nh_init(net, fib_nh, &fib_cfg, 1, extack);
2526 fib_nh_release(net, fib_nh);
2533 /* sets nh_dev if successful */
2534 err = fib_check_nh(net, fib_nh, tb_id, 0, extack);
2536 nh->nh_flags = fib_nh->fib_nh_flags;
2537 fib_info_update_nhc_saddr(net, &fib_nh->nh_common,
2538 !fib_nh->fib_nh_scope ? 0 : fib_nh->fib_nh_scope - 1);
2540 fib_nh_release(net, fib_nh);
2546 static int nh_create_ipv6(struct net *net, struct nexthop *nh,
2547 struct nh_info *nhi, struct nh_config *cfg,
2548 struct netlink_ext_ack *extack)
2550 struct fib6_nh *fib6_nh = &nhi->fib6_nh;
2551 struct fib6_config fib6_cfg = {
2552 .fc_table = l3mdev_fib_table(cfg->dev),
2553 .fc_ifindex = cfg->nh_ifindex,
2554 .fc_gateway = cfg->gw.ipv6,
2555 .fc_flags = cfg->nh_flags,
2556 .fc_nlinfo = cfg->nlinfo,
2557 .fc_encap = cfg->nh_encap,
2558 .fc_encap_type = cfg->nh_encap_type,
2559 .fc_is_fdb = cfg->nh_fdb,
2563 if (!ipv6_addr_any(&cfg->gw.ipv6))
2564 fib6_cfg.fc_flags |= RTF_GATEWAY;
2566 /* sets nh_dev if successful */
2567 err = ipv6_stub->fib6_nh_init(net, fib6_nh, &fib6_cfg, GFP_KERNEL,
2570 /* IPv6 is not enabled, don't call fib6_nh_release */
2571 if (err == -EAFNOSUPPORT)
2573 ipv6_stub->fib6_nh_release(fib6_nh);
2575 nh->nh_flags = fib6_nh->fib_nh_flags;
2581 static struct nexthop *nexthop_create(struct net *net, struct nh_config *cfg,
2582 struct netlink_ext_ack *extack)
2584 struct nh_info *nhi;
2588 nh = nexthop_alloc();
2590 return ERR_PTR(-ENOMEM);
2592 nhi = kzalloc(sizeof(*nhi), GFP_KERNEL);
2595 return ERR_PTR(-ENOMEM);
2598 nh->nh_flags = cfg->nh_flags;
2601 nhi->nh_parent = nh;
2602 nhi->family = cfg->nh_family;
2603 nhi->fib_nhc.nhc_scope = RT_SCOPE_LINK;
2608 if (cfg->nh_blackhole) {
2610 cfg->nh_ifindex = net->loopback_dev->ifindex;
2613 switch (cfg->nh_family) {
2615 err = nh_create_ipv4(net, nh, nhi, cfg, extack);
2618 err = nh_create_ipv6(net, nh, nhi, cfg, extack);
2625 return ERR_PTR(err);
2628 /* add the entry to the device based hash */
2630 nexthop_devhash_add(net, nhi);
2632 rcu_assign_pointer(nh->nh_info, nhi);
2637 /* called with rtnl lock held */
2638 static struct nexthop *nexthop_add(struct net *net, struct nh_config *cfg,
2639 struct netlink_ext_ack *extack)
2644 if (cfg->nlflags & NLM_F_REPLACE && !cfg->nh_id) {
2645 NL_SET_ERR_MSG(extack, "Replace requires nexthop id");
2646 return ERR_PTR(-EINVAL);
2650 cfg->nh_id = nh_find_unused_id(net);
2652 NL_SET_ERR_MSG(extack, "No unused id");
2653 return ERR_PTR(-EINVAL);
2658 nh = nexthop_create_group(net, cfg);
2660 nh = nexthop_create(net, cfg, extack);
2665 refcount_set(&nh->refcnt, 1);
2666 nh->id = cfg->nh_id;
2667 nh->protocol = cfg->nh_protocol;
2670 err = insert_nexthop(net, nh, cfg, extack);
2672 __remove_nexthop(net, nh, NULL);
2680 static int rtm_nh_get_timer(struct nlattr *attr, unsigned long fallback,
2681 unsigned long *timer_p, bool *has_p,
2682 struct netlink_ext_ack *extack)
2684 unsigned long timer;
2688 *timer_p = fallback;
2693 value = nla_get_u32(attr);
2694 timer = clock_t_to_jiffies(value);
2695 if (timer == ~0UL) {
2696 NL_SET_ERR_MSG(extack, "Timer value too large");
2705 static int rtm_to_nh_config_grp_res(struct nlattr *res, struct nh_config *cfg,
2706 struct netlink_ext_ack *extack)
2708 struct nlattr *tb[ARRAY_SIZE(rtm_nh_res_policy_new)] = {};
2712 err = nla_parse_nested(tb,
2713 ARRAY_SIZE(rtm_nh_res_policy_new) - 1,
2714 res, rtm_nh_res_policy_new, extack);
2719 if (tb[NHA_RES_GROUP_BUCKETS]) {
2720 cfg->nh_grp_res_num_buckets =
2721 nla_get_u16(tb[NHA_RES_GROUP_BUCKETS]);
2722 cfg->nh_grp_res_has_num_buckets = true;
2723 if (!cfg->nh_grp_res_num_buckets) {
2724 NL_SET_ERR_MSG(extack, "Number of buckets needs to be non-0");
2729 err = rtm_nh_get_timer(tb[NHA_RES_GROUP_IDLE_TIMER],
2730 NH_RES_DEFAULT_IDLE_TIMER,
2731 &cfg->nh_grp_res_idle_timer,
2732 &cfg->nh_grp_res_has_idle_timer,
2737 return rtm_nh_get_timer(tb[NHA_RES_GROUP_UNBALANCED_TIMER],
2738 NH_RES_DEFAULT_UNBALANCED_TIMER,
2739 &cfg->nh_grp_res_unbalanced_timer,
2740 &cfg->nh_grp_res_has_unbalanced_timer,
2744 static int rtm_to_nh_config(struct net *net, struct sk_buff *skb,
2745 struct nlmsghdr *nlh, struct nh_config *cfg,
2746 struct netlink_ext_ack *extack)
2748 struct nhmsg *nhm = nlmsg_data(nlh);
2749 struct nlattr *tb[ARRAY_SIZE(rtm_nh_policy_new)];
2752 err = nlmsg_parse(nlh, sizeof(*nhm), tb,
2753 ARRAY_SIZE(rtm_nh_policy_new) - 1,
2754 rtm_nh_policy_new, extack);
2759 if (nhm->resvd || nhm->nh_scope) {
2760 NL_SET_ERR_MSG(extack, "Invalid values in ancillary header");
2763 if (nhm->nh_flags & ~NEXTHOP_VALID_USER_FLAGS) {
2764 NL_SET_ERR_MSG(extack, "Invalid nexthop flags in ancillary header");
2768 switch (nhm->nh_family) {
2777 NL_SET_ERR_MSG(extack, "Invalid address family");
2781 memset(cfg, 0, sizeof(*cfg));
2782 cfg->nlflags = nlh->nlmsg_flags;
2783 cfg->nlinfo.portid = NETLINK_CB(skb).portid;
2784 cfg->nlinfo.nlh = nlh;
2785 cfg->nlinfo.nl_net = net;
2787 cfg->nh_family = nhm->nh_family;
2788 cfg->nh_protocol = nhm->nh_protocol;
2789 cfg->nh_flags = nhm->nh_flags;
2792 cfg->nh_id = nla_get_u32(tb[NHA_ID]);
2795 if (tb[NHA_OIF] || tb[NHA_BLACKHOLE] ||
2796 tb[NHA_ENCAP] || tb[NHA_ENCAP_TYPE]) {
2797 NL_SET_ERR_MSG(extack, "Fdb attribute can not be used with encap, oif or blackhole");
2800 if (nhm->nh_flags) {
2801 NL_SET_ERR_MSG(extack, "Unsupported nexthop flags in ancillary header");
2804 cfg->nh_fdb = nla_get_flag(tb[NHA_FDB]);
2807 if (tb[NHA_GROUP]) {
2808 if (nhm->nh_family != AF_UNSPEC) {
2809 NL_SET_ERR_MSG(extack, "Invalid family for group");
2812 cfg->nh_grp = tb[NHA_GROUP];
2814 cfg->nh_grp_type = NEXTHOP_GRP_TYPE_MPATH;
2815 if (tb[NHA_GROUP_TYPE])
2816 cfg->nh_grp_type = nla_get_u16(tb[NHA_GROUP_TYPE]);
2818 if (cfg->nh_grp_type > NEXTHOP_GRP_TYPE_MAX) {
2819 NL_SET_ERR_MSG(extack, "Invalid group type");
2822 err = nh_check_attr_group(net, tb, ARRAY_SIZE(tb),
2823 cfg->nh_grp_type, extack);
2827 if (cfg->nh_grp_type == NEXTHOP_GRP_TYPE_RES)
2828 err = rtm_to_nh_config_grp_res(tb[NHA_RES_GROUP],
2831 /* no other attributes should be set */
2835 if (tb[NHA_BLACKHOLE]) {
2836 if (tb[NHA_GATEWAY] || tb[NHA_OIF] ||
2837 tb[NHA_ENCAP] || tb[NHA_ENCAP_TYPE] || tb[NHA_FDB]) {
2838 NL_SET_ERR_MSG(extack, "Blackhole attribute can not be used with gateway, oif, encap or fdb");
2842 cfg->nh_blackhole = 1;
2847 if (!cfg->nh_fdb && !tb[NHA_OIF]) {
2848 NL_SET_ERR_MSG(extack, "Device attribute required for non-blackhole and non-fdb nexthops");
2852 if (!cfg->nh_fdb && tb[NHA_OIF]) {
2853 cfg->nh_ifindex = nla_get_u32(tb[NHA_OIF]);
2854 if (cfg->nh_ifindex)
2855 cfg->dev = __dev_get_by_index(net, cfg->nh_ifindex);
2858 NL_SET_ERR_MSG(extack, "Invalid device index");
2860 } else if (!(cfg->dev->flags & IFF_UP)) {
2861 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
2864 } else if (!netif_carrier_ok(cfg->dev)) {
2865 NL_SET_ERR_MSG(extack, "Carrier for nexthop device is down");
2872 if (tb[NHA_GATEWAY]) {
2873 struct nlattr *gwa = tb[NHA_GATEWAY];
2875 switch (cfg->nh_family) {
2877 if (nla_len(gwa) != sizeof(u32)) {
2878 NL_SET_ERR_MSG(extack, "Invalid gateway");
2881 cfg->gw.ipv4 = nla_get_be32(gwa);
2884 if (nla_len(gwa) != sizeof(struct in6_addr)) {
2885 NL_SET_ERR_MSG(extack, "Invalid gateway");
2888 cfg->gw.ipv6 = nla_get_in6_addr(gwa);
2891 NL_SET_ERR_MSG(extack,
2892 "Unknown address family for gateway");
2896 /* device only nexthop (no gateway) */
2897 if (cfg->nh_flags & RTNH_F_ONLINK) {
2898 NL_SET_ERR_MSG(extack,
2899 "ONLINK flag can not be set for nexthop without a gateway");
2904 if (tb[NHA_ENCAP]) {
2905 cfg->nh_encap = tb[NHA_ENCAP];
2907 if (!tb[NHA_ENCAP_TYPE]) {
2908 NL_SET_ERR_MSG(extack, "LWT encapsulation type is missing");
2912 cfg->nh_encap_type = nla_get_u16(tb[NHA_ENCAP_TYPE]);
2913 err = lwtunnel_valid_encap_type(cfg->nh_encap_type, extack);
2917 } else if (tb[NHA_ENCAP_TYPE]) {
2918 NL_SET_ERR_MSG(extack, "LWT encapsulation attribute is missing");
2929 static int rtm_new_nexthop(struct sk_buff *skb, struct nlmsghdr *nlh,
2930 struct netlink_ext_ack *extack)
2932 struct net *net = sock_net(skb->sk);
2933 struct nh_config cfg;
2937 err = rtm_to_nh_config(net, skb, nlh, &cfg, extack);
2939 nh = nexthop_add(net, &cfg, extack);
2947 static int __nh_valid_get_del_req(const struct nlmsghdr *nlh,
2948 struct nlattr **tb, u32 *id,
2949 struct netlink_ext_ack *extack)
2951 struct nhmsg *nhm = nlmsg_data(nlh);
2953 if (nhm->nh_protocol || nhm->resvd || nhm->nh_scope || nhm->nh_flags) {
2954 NL_SET_ERR_MSG(extack, "Invalid values in header");
2959 NL_SET_ERR_MSG(extack, "Nexthop id is missing");
2963 *id = nla_get_u32(tb[NHA_ID]);
2965 NL_SET_ERR_MSG(extack, "Invalid nexthop id");
2972 static int nh_valid_get_del_req(const struct nlmsghdr *nlh, u32 *id,
2973 struct netlink_ext_ack *extack)
2975 struct nlattr *tb[ARRAY_SIZE(rtm_nh_policy_get)];
2978 err = nlmsg_parse(nlh, sizeof(struct nhmsg), tb,
2979 ARRAY_SIZE(rtm_nh_policy_get) - 1,
2980 rtm_nh_policy_get, extack);
2984 return __nh_valid_get_del_req(nlh, tb, id, extack);
2988 static int rtm_del_nexthop(struct sk_buff *skb, struct nlmsghdr *nlh,
2989 struct netlink_ext_ack *extack)
2991 struct net *net = sock_net(skb->sk);
2992 struct nl_info nlinfo = {
2995 .portid = NETLINK_CB(skb).portid,
3001 err = nh_valid_get_del_req(nlh, &id, extack);
3005 nh = nexthop_find_by_id(net, id);
3009 remove_nexthop(net, nh, &nlinfo);
3015 static int rtm_get_nexthop(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3016 struct netlink_ext_ack *extack)
3018 struct net *net = sock_net(in_skb->sk);
3019 struct sk_buff *skb = NULL;
3024 err = nh_valid_get_del_req(nlh, &id, extack);
3029 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3034 nh = nexthop_find_by_id(net, id);
3038 err = nh_fill_node(skb, nh, RTM_NEWNEXTHOP, NETLINK_CB(in_skb).portid,
3041 WARN_ON(err == -EMSGSIZE);
3045 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3053 struct nh_dump_filter {
3059 u32 res_bucket_nh_id;
3062 static bool nh_dump_filtered(struct nexthop *nh,
3063 struct nh_dump_filter *filter, u8 family)
3065 const struct net_device *dev;
3066 const struct nh_info *nhi;
3068 if (filter->group_filter && !nh->is_group)
3071 if (!filter->dev_idx && !filter->master_idx && !family)
3077 nhi = rtnl_dereference(nh->nh_info);
3078 if (family && nhi->family != family)
3081 dev = nhi->fib_nhc.nhc_dev;
3082 if (filter->dev_idx && (!dev || dev->ifindex != filter->dev_idx))
3085 if (filter->master_idx) {
3086 struct net_device *master;
3091 master = netdev_master_upper_dev_get((struct net_device *)dev);
3092 if (!master || master->ifindex != filter->master_idx)
3099 static int __nh_valid_dump_req(const struct nlmsghdr *nlh, struct nlattr **tb,
3100 struct nh_dump_filter *filter,
3101 struct netlink_ext_ack *extack)
3107 idx = nla_get_u32(tb[NHA_OIF]);
3108 if (idx > INT_MAX) {
3109 NL_SET_ERR_MSG(extack, "Invalid device index");
3112 filter->dev_idx = idx;
3114 if (tb[NHA_MASTER]) {
3115 idx = nla_get_u32(tb[NHA_MASTER]);
3116 if (idx > INT_MAX) {
3117 NL_SET_ERR_MSG(extack, "Invalid master device index");
3120 filter->master_idx = idx;
3122 filter->group_filter = nla_get_flag(tb[NHA_GROUPS]);
3123 filter->fdb_filter = nla_get_flag(tb[NHA_FDB]);
3125 nhm = nlmsg_data(nlh);
3126 if (nhm->nh_protocol || nhm->resvd || nhm->nh_scope || nhm->nh_flags) {
3127 NL_SET_ERR_MSG(extack, "Invalid values in header for nexthop dump request");
3134 static int nh_valid_dump_req(const struct nlmsghdr *nlh,
3135 struct nh_dump_filter *filter,
3136 struct netlink_callback *cb)
3138 struct nlattr *tb[ARRAY_SIZE(rtm_nh_policy_dump)];
3141 err = nlmsg_parse(nlh, sizeof(struct nhmsg), tb,
3142 ARRAY_SIZE(rtm_nh_policy_dump) - 1,
3143 rtm_nh_policy_dump, cb->extack);
3147 return __nh_valid_dump_req(nlh, tb, filter, cb->extack);
3150 struct rtm_dump_nh_ctx {
3154 static struct rtm_dump_nh_ctx *
3155 rtm_dump_nh_ctx(struct netlink_callback *cb)
3157 struct rtm_dump_nh_ctx *ctx = (void *)cb->ctx;
3159 BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
3163 static int rtm_dump_walk_nexthops(struct sk_buff *skb,
3164 struct netlink_callback *cb,
3165 struct rb_root *root,
3166 struct rtm_dump_nh_ctx *ctx,
3167 int (*nh_cb)(struct sk_buff *skb,
3168 struct netlink_callback *cb,
3169 struct nexthop *nh, void *data),
3172 struct rb_node *node;
3177 for (node = rb_first(root); node; node = rb_next(node)) {
3180 nh = rb_entry(node, struct nexthop, rb_node);
3185 err = nh_cb(skb, cb, nh, data);
3194 static int rtm_dump_nexthop_cb(struct sk_buff *skb, struct netlink_callback *cb,
3195 struct nexthop *nh, void *data)
3197 struct nhmsg *nhm = nlmsg_data(cb->nlh);
3198 struct nh_dump_filter *filter = data;
3200 if (nh_dump_filtered(nh, filter, nhm->nh_family))
3203 return nh_fill_node(skb, nh, RTM_NEWNEXTHOP,
3204 NETLINK_CB(cb->skb).portid,
3205 cb->nlh->nlmsg_seq, NLM_F_MULTI);
3209 static int rtm_dump_nexthop(struct sk_buff *skb, struct netlink_callback *cb)
3211 struct rtm_dump_nh_ctx *ctx = rtm_dump_nh_ctx(cb);
3212 struct net *net = sock_net(skb->sk);
3213 struct rb_root *root = &net->nexthop.rb_root;
3214 struct nh_dump_filter filter = {};
3217 err = nh_valid_dump_req(cb->nlh, &filter, cb);
3221 err = rtm_dump_walk_nexthops(skb, cb, root, ctx,
3222 &rtm_dump_nexthop_cb, &filter);
3224 if (likely(skb->len))
3228 cb->seq = net->nexthop.seq;
3229 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3233 static struct nexthop *
3234 nexthop_find_group_resilient(struct net *net, u32 id,
3235 struct netlink_ext_ack *extack)
3237 struct nh_group *nhg;
3240 nh = nexthop_find_by_id(net, id);
3242 return ERR_PTR(-ENOENT);
3244 if (!nh->is_group) {
3245 NL_SET_ERR_MSG(extack, "Not a nexthop group");
3246 return ERR_PTR(-EINVAL);
3249 nhg = rtnl_dereference(nh->nh_grp);
3250 if (!nhg->resilient) {
3251 NL_SET_ERR_MSG(extack, "Nexthop group not of type resilient");
3252 return ERR_PTR(-EINVAL);
3258 static int nh_valid_dump_nhid(struct nlattr *attr, u32 *nh_id_p,
3259 struct netlink_ext_ack *extack)
3264 idx = nla_get_u32(attr);
3266 NL_SET_ERR_MSG(extack, "Invalid nexthop id");
3277 static int nh_valid_dump_bucket_req(const struct nlmsghdr *nlh,
3278 struct nh_dump_filter *filter,
3279 struct netlink_callback *cb)
3281 struct nlattr *res_tb[ARRAY_SIZE(rtm_nh_res_bucket_policy_dump)];
3282 struct nlattr *tb[ARRAY_SIZE(rtm_nh_policy_dump_bucket)];
3285 err = nlmsg_parse(nlh, sizeof(struct nhmsg), tb,
3286 ARRAY_SIZE(rtm_nh_policy_dump_bucket) - 1,
3287 rtm_nh_policy_dump_bucket, NULL);
3291 err = nh_valid_dump_nhid(tb[NHA_ID], &filter->nh_id, cb->extack);
3295 if (tb[NHA_RES_BUCKET]) {
3296 size_t max = ARRAY_SIZE(rtm_nh_res_bucket_policy_dump) - 1;
3298 err = nla_parse_nested(res_tb, max,
3300 rtm_nh_res_bucket_policy_dump,
3305 err = nh_valid_dump_nhid(res_tb[NHA_RES_BUCKET_NH_ID],
3306 &filter->res_bucket_nh_id,
3312 return __nh_valid_dump_req(nlh, tb, filter, cb->extack);
3315 struct rtm_dump_res_bucket_ctx {
3316 struct rtm_dump_nh_ctx nh;
3318 u32 done_nh_idx; /* 1 + the index of the last fully processed NH. */
3321 static struct rtm_dump_res_bucket_ctx *
3322 rtm_dump_res_bucket_ctx(struct netlink_callback *cb)
3324 struct rtm_dump_res_bucket_ctx *ctx = (void *)cb->ctx;
3326 BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
3330 struct rtm_dump_nexthop_bucket_data {
3331 struct rtm_dump_res_bucket_ctx *ctx;
3332 struct nh_dump_filter filter;
3335 static int rtm_dump_nexthop_bucket_nh(struct sk_buff *skb,
3336 struct netlink_callback *cb,
3338 struct rtm_dump_nexthop_bucket_data *dd)
3340 u32 portid = NETLINK_CB(cb->skb).portid;
3341 struct nhmsg *nhm = nlmsg_data(cb->nlh);
3342 struct nh_res_table *res_table;
3343 struct nh_group *nhg;
3347 if (dd->ctx->nh.idx < dd->ctx->done_nh_idx)
3350 nhg = rtnl_dereference(nh->nh_grp);
3351 res_table = rtnl_dereference(nhg->res_table);
3352 for (bucket_index = dd->ctx->bucket_index;
3353 bucket_index < res_table->num_nh_buckets;
3355 struct nh_res_bucket *bucket;
3356 struct nh_grp_entry *nhge;
3358 bucket = &res_table->nh_buckets[bucket_index];
3359 nhge = rtnl_dereference(bucket->nh_entry);
3360 if (nh_dump_filtered(nhge->nh, &dd->filter, nhm->nh_family))
3363 if (dd->filter.res_bucket_nh_id &&
3364 dd->filter.res_bucket_nh_id != nhge->nh->id)
3367 dd->ctx->bucket_index = bucket_index;
3368 err = nh_fill_res_bucket(skb, nh, bucket, bucket_index,
3369 RTM_NEWNEXTHOPBUCKET, portid,
3370 cb->nlh->nlmsg_seq, NLM_F_MULTI,
3376 dd->ctx->done_nh_idx = dd->ctx->nh.idx + 1;
3377 dd->ctx->bucket_index = 0;
3382 static int rtm_dump_nexthop_bucket_cb(struct sk_buff *skb,
3383 struct netlink_callback *cb,
3384 struct nexthop *nh, void *data)
3386 struct rtm_dump_nexthop_bucket_data *dd = data;
3387 struct nh_group *nhg;
3392 nhg = rtnl_dereference(nh->nh_grp);
3393 if (!nhg->resilient)
3396 return rtm_dump_nexthop_bucket_nh(skb, cb, nh, dd);
3400 static int rtm_dump_nexthop_bucket(struct sk_buff *skb,
3401 struct netlink_callback *cb)
3403 struct rtm_dump_res_bucket_ctx *ctx = rtm_dump_res_bucket_ctx(cb);
3404 struct rtm_dump_nexthop_bucket_data dd = { .ctx = ctx };
3405 struct net *net = sock_net(skb->sk);
3409 err = nh_valid_dump_bucket_req(cb->nlh, &dd.filter, cb);
3413 if (dd.filter.nh_id) {
3414 nh = nexthop_find_group_resilient(net, dd.filter.nh_id,
3418 err = rtm_dump_nexthop_bucket_nh(skb, cb, nh, &dd);
3420 struct rb_root *root = &net->nexthop.rb_root;
3422 err = rtm_dump_walk_nexthops(skb, cb, root, &ctx->nh,
3423 &rtm_dump_nexthop_bucket_cb, &dd);
3427 if (likely(skb->len))
3431 cb->seq = net->nexthop.seq;
3432 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3436 static int nh_valid_get_bucket_req_res_bucket(struct nlattr *res,
3438 struct netlink_ext_ack *extack)
3440 struct nlattr *tb[ARRAY_SIZE(rtm_nh_res_bucket_policy_get)];
3443 err = nla_parse_nested(tb, ARRAY_SIZE(rtm_nh_res_bucket_policy_get) - 1,
3444 res, rtm_nh_res_bucket_policy_get, extack);
3448 if (!tb[NHA_RES_BUCKET_INDEX]) {
3449 NL_SET_ERR_MSG(extack, "Bucket index is missing");
3453 *bucket_index = nla_get_u16(tb[NHA_RES_BUCKET_INDEX]);
3457 static int nh_valid_get_bucket_req(const struct nlmsghdr *nlh,
3458 u32 *id, u16 *bucket_index,
3459 struct netlink_ext_ack *extack)
3461 struct nlattr *tb[ARRAY_SIZE(rtm_nh_policy_get_bucket)];
3464 err = nlmsg_parse(nlh, sizeof(struct nhmsg), tb,
3465 ARRAY_SIZE(rtm_nh_policy_get_bucket) - 1,
3466 rtm_nh_policy_get_bucket, extack);
3470 err = __nh_valid_get_del_req(nlh, tb, id, extack);
3474 if (!tb[NHA_RES_BUCKET]) {
3475 NL_SET_ERR_MSG(extack, "Bucket information is missing");
3479 err = nh_valid_get_bucket_req_res_bucket(tb[NHA_RES_BUCKET],
3480 bucket_index, extack);
3488 static int rtm_get_nexthop_bucket(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3489 struct netlink_ext_ack *extack)
3491 struct net *net = sock_net(in_skb->sk);
3492 struct nh_res_table *res_table;
3493 struct sk_buff *skb = NULL;
3494 struct nh_group *nhg;
3500 err = nh_valid_get_bucket_req(nlh, &id, &bucket_index, extack);
3504 nh = nexthop_find_group_resilient(net, id, extack);
3508 nhg = rtnl_dereference(nh->nh_grp);
3509 res_table = rtnl_dereference(nhg->res_table);
3510 if (bucket_index >= res_table->num_nh_buckets) {
3511 NL_SET_ERR_MSG(extack, "Bucket index out of bounds");
3515 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3519 err = nh_fill_res_bucket(skb, nh, &res_table->nh_buckets[bucket_index],
3520 bucket_index, RTM_NEWNEXTHOPBUCKET,
3521 NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
3524 WARN_ON(err == -EMSGSIZE);
3528 return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3535 static void nexthop_sync_mtu(struct net_device *dev, u32 orig_mtu)
3537 unsigned int hash = nh_dev_hashfn(dev->ifindex);
3538 struct net *net = dev_net(dev);
3539 struct hlist_head *head = &net->nexthop.devhash[hash];
3540 struct hlist_node *n;
3541 struct nh_info *nhi;
3543 hlist_for_each_entry_safe(nhi, n, head, dev_hash) {
3544 if (nhi->fib_nhc.nhc_dev == dev) {
3545 if (nhi->family == AF_INET)
3546 fib_nhc_update_mtu(&nhi->fib_nhc, dev->mtu,
3553 static int nh_netdev_event(struct notifier_block *this,
3554 unsigned long event, void *ptr)
3556 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3557 struct netdev_notifier_info_ext *info_ext;
3561 case NETDEV_UNREGISTER:
3562 nexthop_flush_dev(dev, event);
3565 if (!(dev_get_flags(dev) & (IFF_RUNNING | IFF_LOWER_UP)))
3566 nexthop_flush_dev(dev, event);
3568 case NETDEV_CHANGEMTU:
3570 nexthop_sync_mtu(dev, info_ext->ext.mtu);
3571 rt_cache_flush(dev_net(dev));
3577 static struct notifier_block nh_netdev_notifier = {
3578 .notifier_call = nh_netdev_event,
3581 static int nexthops_dump(struct net *net, struct notifier_block *nb,
3582 enum nexthop_event_type event_type,
3583 struct netlink_ext_ack *extack)
3585 struct rb_root *root = &net->nexthop.rb_root;
3586 struct rb_node *node;
3589 for (node = rb_first(root); node; node = rb_next(node)) {
3592 nh = rb_entry(node, struct nexthop, rb_node);
3593 err = call_nexthop_notifier(nb, net, event_type, nh, extack);
3601 int register_nexthop_notifier(struct net *net, struct notifier_block *nb,
3602 struct netlink_ext_ack *extack)
3607 err = nexthops_dump(net, nb, NEXTHOP_EVENT_REPLACE, extack);
3610 err = blocking_notifier_chain_register(&net->nexthop.notifier_chain,
3616 EXPORT_SYMBOL(register_nexthop_notifier);
3618 int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb)
3623 err = blocking_notifier_chain_unregister(&net->nexthop.notifier_chain,
3627 nexthops_dump(net, nb, NEXTHOP_EVENT_DEL, NULL);
3632 EXPORT_SYMBOL(unregister_nexthop_notifier);
3634 void nexthop_set_hw_flags(struct net *net, u32 id, bool offload, bool trap)
3636 struct nexthop *nexthop;
3640 nexthop = nexthop_find_by_id(net, id);
3644 nexthop->nh_flags &= ~(RTNH_F_OFFLOAD | RTNH_F_TRAP);
3646 nexthop->nh_flags |= RTNH_F_OFFLOAD;
3648 nexthop->nh_flags |= RTNH_F_TRAP;
3653 EXPORT_SYMBOL(nexthop_set_hw_flags);
3655 void nexthop_bucket_set_hw_flags(struct net *net, u32 id, u16 bucket_index,
3656 bool offload, bool trap)
3658 struct nh_res_table *res_table;
3659 struct nh_res_bucket *bucket;
3660 struct nexthop *nexthop;
3661 struct nh_group *nhg;
3665 nexthop = nexthop_find_by_id(net, id);
3666 if (!nexthop || !nexthop->is_group)
3669 nhg = rcu_dereference(nexthop->nh_grp);
3670 if (!nhg->resilient)
3673 if (bucket_index >= nhg->res_table->num_nh_buckets)
3676 res_table = rcu_dereference(nhg->res_table);
3677 bucket = &res_table->nh_buckets[bucket_index];
3678 bucket->nh_flags &= ~(RTNH_F_OFFLOAD | RTNH_F_TRAP);
3680 bucket->nh_flags |= RTNH_F_OFFLOAD;
3682 bucket->nh_flags |= RTNH_F_TRAP;
3687 EXPORT_SYMBOL(nexthop_bucket_set_hw_flags);
3689 void nexthop_res_grp_activity_update(struct net *net, u32 id, u16 num_buckets,
3690 unsigned long *activity)
3692 struct nh_res_table *res_table;
3693 struct nexthop *nexthop;
3694 struct nh_group *nhg;
3699 nexthop = nexthop_find_by_id(net, id);
3700 if (!nexthop || !nexthop->is_group)
3703 nhg = rcu_dereference(nexthop->nh_grp);
3704 if (!nhg->resilient)
3707 /* Instead of silently ignoring some buckets, demand that the sizes
3710 res_table = rcu_dereference(nhg->res_table);
3711 if (num_buckets != res_table->num_nh_buckets)
3714 for (i = 0; i < num_buckets; i++) {
3715 if (test_bit(i, activity))
3716 nh_res_bucket_set_busy(&res_table->nh_buckets[i]);
3722 EXPORT_SYMBOL(nexthop_res_grp_activity_update);
3724 static void __net_exit nexthop_net_exit(struct net *net)
3727 flush_all_nexthops(net);
3729 kfree(net->nexthop.devhash);
3732 static int __net_init nexthop_net_init(struct net *net)
3734 size_t sz = sizeof(struct hlist_head) * NH_DEV_HASHSIZE;
3736 net->nexthop.rb_root = RB_ROOT;
3737 net->nexthop.devhash = kzalloc(sz, GFP_KERNEL);
3738 if (!net->nexthop.devhash)
3740 BLOCKING_INIT_NOTIFIER_HEAD(&net->nexthop.notifier_chain);
3745 static struct pernet_operations nexthop_net_ops = {
3746 .init = nexthop_net_init,
3747 .exit = nexthop_net_exit,
3750 static int __init nexthop_init(void)
3752 register_pernet_subsys(&nexthop_net_ops);
3754 register_netdevice_notifier(&nh_netdev_notifier);
3756 rtnl_register(PF_UNSPEC, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0);
3757 rtnl_register(PF_UNSPEC, RTM_DELNEXTHOP, rtm_del_nexthop, NULL, 0);
3758 rtnl_register(PF_UNSPEC, RTM_GETNEXTHOP, rtm_get_nexthop,
3759 rtm_dump_nexthop, 0);
3761 rtnl_register(PF_INET, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0);
3762 rtnl_register(PF_INET, RTM_GETNEXTHOP, NULL, rtm_dump_nexthop, 0);
3764 rtnl_register(PF_INET6, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0);
3765 rtnl_register(PF_INET6, RTM_GETNEXTHOP, NULL, rtm_dump_nexthop, 0);
3767 rtnl_register(PF_UNSPEC, RTM_GETNEXTHOPBUCKET, rtm_get_nexthop_bucket,
3768 rtm_dump_nexthop_bucket, 0);
3772 subsys_initcall(nexthop_init);