1 // SPDX-License-Identifier: GPL-2.0-only
3 * net/core/fib_rules.c Generic Routing Rules
5 * Authors: Thomas Graf <tgraf@suug.ch>
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/slab.h>
11 #include <linux/list.h>
12 #include <linux/module.h>
13 #include <net/net_namespace.h>
15 #include <net/fib_rules.h>
16 #include <net/ip_tunnels.h>
17 #include <linux/indirect_call_wrapper.h>
19 #if defined(CONFIG_IPV6) && defined(CONFIG_IPV6_MULTIPLE_TABLES)
20 #ifdef CONFIG_IP_MULTIPLE_TABLES
21 #define INDIRECT_CALL_MT(f, f2, f1, ...) \
22 INDIRECT_CALL_INET(f, f2, f1, __VA_ARGS__)
24 #define INDIRECT_CALL_MT(f, f2, f1, ...) INDIRECT_CALL_1(f, f2, __VA_ARGS__)
26 #elif defined(CONFIG_IP_MULTIPLE_TABLES)
27 #define INDIRECT_CALL_MT(f, f2, f1, ...) INDIRECT_CALL_1(f, f1, __VA_ARGS__)
29 #define INDIRECT_CALL_MT(f, f2, f1, ...) f(__VA_ARGS__)
32 static const struct fib_kuid_range fib_kuid_range_unset = {
37 bool fib_rule_matchall(const struct fib_rule *rule)
39 if (rule->iifindex || rule->oifindex || rule->mark || rule->tun_id ||
42 if (rule->suppress_ifgroup != -1 || rule->suppress_prefixlen != -1)
44 if (!uid_eq(rule->uid_range.start, fib_kuid_range_unset.start) ||
45 !uid_eq(rule->uid_range.end, fib_kuid_range_unset.end))
47 if (fib_rule_port_range_set(&rule->sport_range))
49 if (fib_rule_port_range_set(&rule->dport_range))
53 EXPORT_SYMBOL_GPL(fib_rule_matchall);
55 int fib_default_rule_add(struct fib_rules_ops *ops,
60 r = kzalloc(ops->rule_size, GFP_KERNEL_ACCOUNT);
64 refcount_set(&r->refcnt, 1);
65 r->action = FR_ACT_TO_TBL;
68 r->proto = RTPROT_KERNEL;
69 r->fr_net = ops->fro_net;
70 r->uid_range = fib_kuid_range_unset;
72 r->suppress_prefixlen = -1;
73 r->suppress_ifgroup = -1;
75 /* The lock is not required here, the list in unreacheable
76 * at the moment this function is called */
77 list_add_tail(&r->list, &ops->rules_list);
80 EXPORT_SYMBOL(fib_default_rule_add);
82 static u32 fib_default_rule_pref(struct fib_rules_ops *ops)
84 struct list_head *pos;
85 struct fib_rule *rule;
87 if (!list_empty(&ops->rules_list)) {
88 pos = ops->rules_list.next;
89 if (pos->next != &ops->rules_list) {
90 rule = list_entry(pos->next, struct fib_rule, list);
92 return rule->pref - 1;
99 static void notify_rule_change(int event, struct fib_rule *rule,
100 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
103 static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
105 struct fib_rules_ops *ops;
108 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
109 if (ops->family == family) {
110 if (!try_module_get(ops->owner))
121 static void rules_ops_put(struct fib_rules_ops *ops)
124 module_put(ops->owner);
127 static void flush_route_cache(struct fib_rules_ops *ops)
129 if (ops->flush_cache)
130 ops->flush_cache(ops);
133 static int __fib_rules_register(struct fib_rules_ops *ops)
136 struct fib_rules_ops *o;
141 if (ops->rule_size < sizeof(struct fib_rule))
144 if (ops->match == NULL || ops->configure == NULL ||
145 ops->compare == NULL || ops->fill == NULL ||
149 spin_lock(&net->rules_mod_lock);
150 list_for_each_entry(o, &net->rules_ops, list)
151 if (ops->family == o->family)
154 list_add_tail_rcu(&ops->list, &net->rules_ops);
157 spin_unlock(&net->rules_mod_lock);
162 struct fib_rules_ops *
163 fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
165 struct fib_rules_ops *ops;
168 ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
170 return ERR_PTR(-ENOMEM);
172 INIT_LIST_HEAD(&ops->rules_list);
175 err = __fib_rules_register(ops);
183 EXPORT_SYMBOL_GPL(fib_rules_register);
185 static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
187 struct fib_rule *rule, *tmp;
189 list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
190 list_del_rcu(&rule->list);
197 void fib_rules_unregister(struct fib_rules_ops *ops)
199 struct net *net = ops->fro_net;
201 spin_lock(&net->rules_mod_lock);
202 list_del_rcu(&ops->list);
203 spin_unlock(&net->rules_mod_lock);
205 fib_rules_cleanup_ops(ops);
208 EXPORT_SYMBOL_GPL(fib_rules_unregister);
210 static int uid_range_set(struct fib_kuid_range *range)
212 return uid_valid(range->start) && uid_valid(range->end);
215 static struct fib_kuid_range nla_get_kuid_range(struct nlattr **tb)
217 struct fib_rule_uid_range *in;
218 struct fib_kuid_range out;
220 in = (struct fib_rule_uid_range *)nla_data(tb[FRA_UID_RANGE]);
222 out.start = make_kuid(current_user_ns(), in->start);
223 out.end = make_kuid(current_user_ns(), in->end);
228 static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range)
230 struct fib_rule_uid_range out = {
231 from_kuid_munged(current_user_ns(), range->start),
232 from_kuid_munged(current_user_ns(), range->end)
235 return nla_put(skb, FRA_UID_RANGE, sizeof(out), &out);
238 static int nla_get_port_range(struct nlattr *pattr,
239 struct fib_rule_port_range *port_range)
241 const struct fib_rule_port_range *pr = nla_data(pattr);
243 if (!fib_rule_port_range_valid(pr))
246 port_range->start = pr->start;
247 port_range->end = pr->end;
252 static int nla_put_port_range(struct sk_buff *skb, int attrtype,
253 struct fib_rule_port_range *range)
255 return nla_put(skb, attrtype, sizeof(*range), range);
258 static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
259 struct flowi *fl, int flags,
260 struct fib_lookup_arg *arg)
264 if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
267 if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
270 if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
273 if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id))
276 if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg))
279 if (uid_lt(fl->flowi_uid, rule->uid_range.start) ||
280 uid_gt(fl->flowi_uid, rule->uid_range.end))
283 ret = INDIRECT_CALL_MT(ops->match,
288 return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
291 int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
292 int flags, struct fib_lookup_arg *arg)
294 struct fib_rule *rule;
299 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
301 if (!fib_rule_match(rule, ops, fl, flags, arg))
304 if (rule->action == FR_ACT_GOTO) {
305 struct fib_rule *target;
307 target = rcu_dereference(rule->ctarget);
308 if (target == NULL) {
314 } else if (rule->action == FR_ACT_NOP)
317 err = INDIRECT_CALL_MT(ops->action,
320 rule, fl, flags, arg);
322 if (!err && ops->suppress && INDIRECT_CALL_MT(ops->suppress,
328 if (err != -EAGAIN) {
329 if ((arg->flags & FIB_LOOKUP_NOREF) ||
330 likely(refcount_inc_not_zero(&rule->refcnt))) {
344 EXPORT_SYMBOL_GPL(fib_rules_lookup);
346 static int call_fib_rule_notifier(struct notifier_block *nb,
347 enum fib_event_type event_type,
348 struct fib_rule *rule, int family,
349 struct netlink_ext_ack *extack)
351 struct fib_rule_notifier_info info = {
352 .info.family = family,
353 .info.extack = extack,
357 return call_fib_notifier(nb, event_type, &info.info);
360 static int call_fib_rule_notifiers(struct net *net,
361 enum fib_event_type event_type,
362 struct fib_rule *rule,
363 struct fib_rules_ops *ops,
364 struct netlink_ext_ack *extack)
366 struct fib_rule_notifier_info info = {
367 .info.family = ops->family,
368 .info.extack = extack,
372 ops->fib_rules_seq++;
373 return call_fib_notifiers(net, event_type, &info.info);
376 /* Called with rcu_read_lock() */
377 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
378 struct netlink_ext_ack *extack)
380 struct fib_rules_ops *ops;
381 struct fib_rule *rule;
384 ops = lookup_rules_ops(net, family);
386 return -EAFNOSUPPORT;
387 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
388 err = call_fib_rule_notifier(nb, FIB_EVENT_RULE_ADD,
389 rule, family, extack);
397 EXPORT_SYMBOL_GPL(fib_rules_dump);
399 unsigned int fib_rules_seq_read(struct net *net, int family)
401 unsigned int fib_rules_seq;
402 struct fib_rules_ops *ops;
406 ops = lookup_rules_ops(net, family);
409 fib_rules_seq = ops->fib_rules_seq;
412 return fib_rules_seq;
414 EXPORT_SYMBOL_GPL(fib_rules_seq_read);
416 static struct fib_rule *rule_find(struct fib_rules_ops *ops,
417 struct fib_rule_hdr *frh,
419 struct fib_rule *rule,
424 list_for_each_entry(r, &ops->rules_list, list) {
425 if (rule->action && r->action != rule->action)
428 if (rule->table && r->table != rule->table)
431 if (user_priority && r->pref != rule->pref)
434 if (rule->iifname[0] &&
435 memcmp(r->iifname, rule->iifname, IFNAMSIZ))
438 if (rule->oifname[0] &&
439 memcmp(r->oifname, rule->oifname, IFNAMSIZ))
442 if (rule->mark && r->mark != rule->mark)
445 if (rule->suppress_ifgroup != -1 &&
446 r->suppress_ifgroup != rule->suppress_ifgroup)
449 if (rule->suppress_prefixlen != -1 &&
450 r->suppress_prefixlen != rule->suppress_prefixlen)
453 if (rule->mark_mask && r->mark_mask != rule->mark_mask)
456 if (rule->tun_id && r->tun_id != rule->tun_id)
459 if (r->fr_net != rule->fr_net)
462 if (rule->l3mdev && r->l3mdev != rule->l3mdev)
465 if (uid_range_set(&rule->uid_range) &&
466 (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
467 !uid_eq(r->uid_range.end, rule->uid_range.end)))
470 if (rule->ip_proto && r->ip_proto != rule->ip_proto)
473 if (rule->proto && r->proto != rule->proto)
476 if (fib_rule_port_range_set(&rule->sport_range) &&
477 !fib_rule_port_range_compare(&r->sport_range,
481 if (fib_rule_port_range_set(&rule->dport_range) &&
482 !fib_rule_port_range_compare(&r->dport_range,
486 if (!ops->compare(r, frh, tb))
494 #ifdef CONFIG_NET_L3_MASTER_DEV
495 static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
496 struct netlink_ext_ack *extack)
498 nlrule->l3mdev = nla_get_u8(nla);
499 if (nlrule->l3mdev != 1) {
500 NL_SET_ERR_MSG(extack, "Invalid l3mdev attribute");
507 static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
508 struct netlink_ext_ack *extack)
510 NL_SET_ERR_MSG(extack, "l3mdev support is not enabled in kernel");
515 static int fib_nl2rule(struct sk_buff *skb, struct nlmsghdr *nlh,
516 struct netlink_ext_ack *extack,
517 struct fib_rules_ops *ops,
519 struct fib_rule **rule,
522 struct net *net = sock_net(skb->sk);
523 struct fib_rule_hdr *frh = nlmsg_data(nlh);
524 struct fib_rule *nlrule = NULL;
529 frh->src_len > (ops->addr_size * 8) ||
530 nla_len(tb[FRA_SRC]) != ops->addr_size) {
531 NL_SET_ERR_MSG(extack, "Invalid source address");
537 frh->dst_len > (ops->addr_size * 8) ||
538 nla_len(tb[FRA_DST]) != ops->addr_size) {
539 NL_SET_ERR_MSG(extack, "Invalid dst address");
543 nlrule = kzalloc(ops->rule_size, GFP_KERNEL_ACCOUNT);
548 refcount_set(&nlrule->refcnt, 1);
549 nlrule->fr_net = net;
551 if (tb[FRA_PRIORITY]) {
552 nlrule->pref = nla_get_u32(tb[FRA_PRIORITY]);
553 *user_priority = true;
555 nlrule->pref = fib_default_rule_pref(ops);
558 nlrule->proto = tb[FRA_PROTOCOL] ?
559 nla_get_u8(tb[FRA_PROTOCOL]) : RTPROT_UNSPEC;
561 if (tb[FRA_IIFNAME]) {
562 struct net_device *dev;
564 nlrule->iifindex = -1;
565 nla_strscpy(nlrule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
566 dev = __dev_get_by_name(net, nlrule->iifname);
568 nlrule->iifindex = dev->ifindex;
571 if (tb[FRA_OIFNAME]) {
572 struct net_device *dev;
574 nlrule->oifindex = -1;
575 nla_strscpy(nlrule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
576 dev = __dev_get_by_name(net, nlrule->oifname);
578 nlrule->oifindex = dev->ifindex;
581 if (tb[FRA_FWMARK]) {
582 nlrule->mark = nla_get_u32(tb[FRA_FWMARK]);
584 /* compatibility: if the mark value is non-zero all bits
585 * are compared unless a mask is explicitly specified.
587 nlrule->mark_mask = 0xFFFFFFFF;
591 nlrule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
594 nlrule->tun_id = nla_get_be64(tb[FRA_TUN_ID]);
596 if (tb[FRA_L3MDEV] &&
597 fib_nl2rule_l3mdev(tb[FRA_L3MDEV], nlrule, extack) < 0)
600 nlrule->action = frh->action;
601 nlrule->flags = frh->flags;
602 nlrule->table = frh_get_table(frh, tb);
603 if (tb[FRA_SUPPRESS_PREFIXLEN])
604 nlrule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
606 nlrule->suppress_prefixlen = -1;
608 if (tb[FRA_SUPPRESS_IFGROUP])
609 nlrule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]);
611 nlrule->suppress_ifgroup = -1;
614 if (nlrule->action != FR_ACT_GOTO) {
615 NL_SET_ERR_MSG(extack, "Unexpected goto");
619 nlrule->target = nla_get_u32(tb[FRA_GOTO]);
620 /* Backward jumps are prohibited to avoid endless loops */
621 if (nlrule->target <= nlrule->pref) {
622 NL_SET_ERR_MSG(extack, "Backward goto not supported");
625 } else if (nlrule->action == FR_ACT_GOTO) {
626 NL_SET_ERR_MSG(extack, "Missing goto target for action goto");
630 if (nlrule->l3mdev && nlrule->table) {
631 NL_SET_ERR_MSG(extack, "l3mdev and table are mutually exclusive");
635 if (tb[FRA_UID_RANGE]) {
636 if (current_user_ns() != net->user_ns) {
638 NL_SET_ERR_MSG(extack, "No permission to set uid");
642 nlrule->uid_range = nla_get_kuid_range(tb);
644 if (!uid_range_set(&nlrule->uid_range) ||
645 !uid_lte(nlrule->uid_range.start, nlrule->uid_range.end)) {
646 NL_SET_ERR_MSG(extack, "Invalid uid range");
650 nlrule->uid_range = fib_kuid_range_unset;
653 if (tb[FRA_IP_PROTO])
654 nlrule->ip_proto = nla_get_u8(tb[FRA_IP_PROTO]);
656 if (tb[FRA_SPORT_RANGE]) {
657 err = nla_get_port_range(tb[FRA_SPORT_RANGE],
658 &nlrule->sport_range);
660 NL_SET_ERR_MSG(extack, "Invalid sport range");
665 if (tb[FRA_DPORT_RANGE]) {
666 err = nla_get_port_range(tb[FRA_DPORT_RANGE],
667 &nlrule->dport_range);
669 NL_SET_ERR_MSG(extack, "Invalid dport range");
684 static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh,
685 struct nlattr **tb, struct fib_rule *rule)
689 list_for_each_entry(r, &ops->rules_list, list) {
690 if (r->action != rule->action)
693 if (r->table != rule->table)
696 if (r->pref != rule->pref)
699 if (memcmp(r->iifname, rule->iifname, IFNAMSIZ))
702 if (memcmp(r->oifname, rule->oifname, IFNAMSIZ))
705 if (r->mark != rule->mark)
708 if (r->suppress_ifgroup != rule->suppress_ifgroup)
711 if (r->suppress_prefixlen != rule->suppress_prefixlen)
714 if (r->mark_mask != rule->mark_mask)
717 if (r->tun_id != rule->tun_id)
720 if (r->fr_net != rule->fr_net)
723 if (r->l3mdev != rule->l3mdev)
726 if (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
727 !uid_eq(r->uid_range.end, rule->uid_range.end))
730 if (r->ip_proto != rule->ip_proto)
733 if (r->proto != rule->proto)
736 if (!fib_rule_port_range_compare(&r->sport_range,
740 if (!fib_rule_port_range_compare(&r->dport_range,
744 if (!ops->compare(r, frh, tb))
751 static const struct nla_policy fib_rule_policy[FRA_MAX + 1] = {
752 [FRA_UNSPEC] = { .strict_start_type = FRA_DPORT_RANGE + 1 },
753 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
754 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
755 [FRA_PRIORITY] = { .type = NLA_U32 },
756 [FRA_FWMARK] = { .type = NLA_U32 },
757 [FRA_FLOW] = { .type = NLA_U32 },
758 [FRA_TUN_ID] = { .type = NLA_U64 },
759 [FRA_FWMASK] = { .type = NLA_U32 },
760 [FRA_TABLE] = { .type = NLA_U32 },
761 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 },
762 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 },
763 [FRA_GOTO] = { .type = NLA_U32 },
764 [FRA_L3MDEV] = { .type = NLA_U8 },
765 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) },
766 [FRA_PROTOCOL] = { .type = NLA_U8 },
767 [FRA_IP_PROTO] = { .type = NLA_U8 },
768 [FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) },
769 [FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }
772 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
773 struct netlink_ext_ack *extack)
775 struct net *net = sock_net(skb->sk);
776 struct fib_rule_hdr *frh = nlmsg_data(nlh);
777 struct fib_rules_ops *ops = NULL;
778 struct fib_rule *rule = NULL, *r, *last = NULL;
779 struct nlattr *tb[FRA_MAX + 1];
780 int err = -EINVAL, unresolved = 0;
781 bool user_priority = false;
783 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
784 NL_SET_ERR_MSG(extack, "Invalid msg length");
788 ops = lookup_rules_ops(net, frh->family);
791 NL_SET_ERR_MSG(extack, "Rule family not supported");
795 err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX,
796 fib_rule_policy, extack);
798 NL_SET_ERR_MSG(extack, "Error parsing msg");
802 err = fib_nl2rule(skb, nlh, extack, ops, tb, &rule, &user_priority);
806 if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
807 rule_exists(ops, frh, tb, rule)) {
812 err = ops->configure(rule, skb, frh, tb, extack);
816 err = call_fib_rule_notifiers(net, FIB_EVENT_RULE_ADD, rule, ops,
821 list_for_each_entry(r, &ops->rules_list, list) {
822 if (r->pref == rule->target) {
823 RCU_INIT_POINTER(rule->ctarget, r);
828 if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
831 list_for_each_entry(r, &ops->rules_list, list) {
832 if (r->pref > rule->pref)
838 list_add_rcu(&rule->list, &last->list);
840 list_add_rcu(&rule->list, &ops->rules_list);
842 if (ops->unresolved_rules) {
844 * There are unresolved goto rules in the list, check if
845 * any of them are pointing to this new rule.
847 list_for_each_entry(r, &ops->rules_list, list) {
848 if (r->action == FR_ACT_GOTO &&
849 r->target == rule->pref &&
850 rtnl_dereference(r->ctarget) == NULL) {
851 rcu_assign_pointer(r->ctarget, rule);
852 if (--ops->unresolved_rules == 0)
858 if (rule->action == FR_ACT_GOTO)
859 ops->nr_goto_rules++;
862 ops->unresolved_rules++;
865 ip_tunnel_need_metadata();
867 notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
868 flush_route_cache(ops);
878 EXPORT_SYMBOL_GPL(fib_nl_newrule);
880 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
881 struct netlink_ext_ack *extack)
883 struct net *net = sock_net(skb->sk);
884 struct fib_rule_hdr *frh = nlmsg_data(nlh);
885 struct fib_rules_ops *ops = NULL;
886 struct fib_rule *rule = NULL, *r, *nlrule = NULL;
887 struct nlattr *tb[FRA_MAX+1];
889 bool user_priority = false;
891 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
892 NL_SET_ERR_MSG(extack, "Invalid msg length");
896 ops = lookup_rules_ops(net, frh->family);
899 NL_SET_ERR_MSG(extack, "Rule family not supported");
903 err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX,
904 fib_rule_policy, extack);
906 NL_SET_ERR_MSG(extack, "Error parsing msg");
910 err = fib_nl2rule(skb, nlh, extack, ops, tb, &nlrule, &user_priority);
914 rule = rule_find(ops, frh, tb, nlrule, user_priority);
920 if (rule->flags & FIB_RULE_PERMANENT) {
926 err = ops->delete(rule);
932 ip_tunnel_unneed_metadata();
934 list_del_rcu(&rule->list);
936 if (rule->action == FR_ACT_GOTO) {
937 ops->nr_goto_rules--;
938 if (rtnl_dereference(rule->ctarget) == NULL)
939 ops->unresolved_rules--;
943 * Check if this rule is a target to any of them. If so,
944 * adjust to the next one with the same preference or
945 * disable them. As this operation is eventually very
946 * expensive, it is only performed if goto rules, except
947 * current if it is goto rule, have actually been added.
949 if (ops->nr_goto_rules > 0) {
952 n = list_next_entry(rule, list);
953 if (&n->list == &ops->rules_list || n->pref != rule->pref)
955 list_for_each_entry(r, &ops->rules_list, list) {
956 if (rtnl_dereference(r->ctarget) != rule)
958 rcu_assign_pointer(r->ctarget, n);
960 ops->unresolved_rules++;
964 call_fib_rule_notifiers(net, FIB_EVENT_RULE_DEL, rule, ops,
966 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
967 NETLINK_CB(skb).portid);
969 flush_route_cache(ops);
979 EXPORT_SYMBOL_GPL(fib_nl_delrule);
981 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
982 struct fib_rule *rule)
984 size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
985 + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
986 + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
987 + nla_total_size(4) /* FRA_PRIORITY */
988 + nla_total_size(4) /* FRA_TABLE */
989 + nla_total_size(4) /* FRA_SUPPRESS_PREFIXLEN */
990 + nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */
991 + nla_total_size(4) /* FRA_FWMARK */
992 + nla_total_size(4) /* FRA_FWMASK */
993 + nla_total_size_64bit(8) /* FRA_TUN_ID */
994 + nla_total_size(sizeof(struct fib_kuid_range))
995 + nla_total_size(1) /* FRA_PROTOCOL */
996 + nla_total_size(1) /* FRA_IP_PROTO */
997 + nla_total_size(sizeof(struct fib_rule_port_range)) /* FRA_SPORT_RANGE */
998 + nla_total_size(sizeof(struct fib_rule_port_range)); /* FRA_DPORT_RANGE */
1000 if (ops->nlmsg_payload)
1001 payload += ops->nlmsg_payload(rule);
1006 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
1007 u32 pid, u32 seq, int type, int flags,
1008 struct fib_rules_ops *ops)
1010 struct nlmsghdr *nlh;
1011 struct fib_rule_hdr *frh;
1013 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
1017 frh = nlmsg_data(nlh);
1018 frh->family = ops->family;
1019 frh->table = rule->table < 256 ? rule->table : RT_TABLE_COMPAT;
1020 if (nla_put_u32(skb, FRA_TABLE, rule->table))
1021 goto nla_put_failure;
1022 if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen))
1023 goto nla_put_failure;
1026 frh->action = rule->action;
1027 frh->flags = rule->flags;
1029 if (nla_put_u8(skb, FRA_PROTOCOL, rule->proto))
1030 goto nla_put_failure;
1032 if (rule->action == FR_ACT_GOTO &&
1033 rcu_access_pointer(rule->ctarget) == NULL)
1034 frh->flags |= FIB_RULE_UNRESOLVED;
1036 if (rule->iifname[0]) {
1037 if (nla_put_string(skb, FRA_IIFNAME, rule->iifname))
1038 goto nla_put_failure;
1039 if (rule->iifindex == -1)
1040 frh->flags |= FIB_RULE_IIF_DETACHED;
1043 if (rule->oifname[0]) {
1044 if (nla_put_string(skb, FRA_OIFNAME, rule->oifname))
1045 goto nla_put_failure;
1046 if (rule->oifindex == -1)
1047 frh->flags |= FIB_RULE_OIF_DETACHED;
1051 nla_put_u32(skb, FRA_PRIORITY, rule->pref)) ||
1053 nla_put_u32(skb, FRA_FWMARK, rule->mark)) ||
1054 ((rule->mark_mask || rule->mark) &&
1055 nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) ||
1057 nla_put_u32(skb, FRA_GOTO, rule->target)) ||
1059 nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) ||
1061 nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) ||
1062 (uid_range_set(&rule->uid_range) &&
1063 nla_put_uid_range(skb, &rule->uid_range)) ||
1064 (fib_rule_port_range_set(&rule->sport_range) &&
1065 nla_put_port_range(skb, FRA_SPORT_RANGE, &rule->sport_range)) ||
1066 (fib_rule_port_range_set(&rule->dport_range) &&
1067 nla_put_port_range(skb, FRA_DPORT_RANGE, &rule->dport_range)) ||
1068 (rule->ip_proto && nla_put_u8(skb, FRA_IP_PROTO, rule->ip_proto)))
1069 goto nla_put_failure;
1071 if (rule->suppress_ifgroup != -1) {
1072 if (nla_put_u32(skb, FRA_SUPPRESS_IFGROUP, rule->suppress_ifgroup))
1073 goto nla_put_failure;
1076 if (ops->fill(rule, skb, frh) < 0)
1077 goto nla_put_failure;
1079 nlmsg_end(skb, nlh);
1083 nlmsg_cancel(skb, nlh);
1087 static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
1088 struct fib_rules_ops *ops)
1091 struct fib_rule *rule;
1095 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
1096 if (idx < cb->args[1])
1099 err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
1100 cb->nlh->nlmsg_seq, RTM_NEWRULE,
1114 static int fib_valid_dumprule_req(const struct nlmsghdr *nlh,
1115 struct netlink_ext_ack *extack)
1117 struct fib_rule_hdr *frh;
1119 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
1120 NL_SET_ERR_MSG(extack, "Invalid header for fib rule dump request");
1124 frh = nlmsg_data(nlh);
1125 if (frh->dst_len || frh->src_len || frh->tos || frh->table ||
1126 frh->res1 || frh->res2 || frh->action || frh->flags) {
1127 NL_SET_ERR_MSG(extack,
1128 "Invalid values in header for fib rule dump request");
1132 if (nlmsg_attrlen(nlh, sizeof(*frh))) {
1133 NL_SET_ERR_MSG(extack, "Invalid data after header in fib rule dump request");
1140 static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
1142 const struct nlmsghdr *nlh = cb->nlh;
1143 struct net *net = sock_net(skb->sk);
1144 struct fib_rules_ops *ops;
1145 int idx = 0, family;
1147 if (cb->strict_check) {
1148 int err = fib_valid_dumprule_req(nlh, cb->extack);
1154 family = rtnl_msg_family(nlh);
1155 if (family != AF_UNSPEC) {
1156 /* Protocol specific dump request */
1157 ops = lookup_rules_ops(net, family);
1159 return -EAFNOSUPPORT;
1161 dump_rules(skb, cb, ops);
1167 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
1168 if (idx < cb->args[0] || !try_module_get(ops->owner))
1171 if (dump_rules(skb, cb, ops) < 0)
1184 static void notify_rule_change(int event, struct fib_rule *rule,
1185 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
1189 struct sk_buff *skb;
1193 skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
1197 err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
1199 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
1200 WARN_ON(err == -EMSGSIZE);
1205 rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
1209 rtnl_set_sk_err(net, ops->nlgroup, err);
1212 static void attach_rules(struct list_head *rules, struct net_device *dev)
1214 struct fib_rule *rule;
1216 list_for_each_entry(rule, rules, list) {
1217 if (rule->iifindex == -1 &&
1218 strcmp(dev->name, rule->iifname) == 0)
1219 rule->iifindex = dev->ifindex;
1220 if (rule->oifindex == -1 &&
1221 strcmp(dev->name, rule->oifname) == 0)
1222 rule->oifindex = dev->ifindex;
1226 static void detach_rules(struct list_head *rules, struct net_device *dev)
1228 struct fib_rule *rule;
1230 list_for_each_entry(rule, rules, list) {
1231 if (rule->iifindex == dev->ifindex)
1232 rule->iifindex = -1;
1233 if (rule->oifindex == dev->ifindex)
1234 rule->oifindex = -1;
1239 static int fib_rules_event(struct notifier_block *this, unsigned long event,
1242 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1243 struct net *net = dev_net(dev);
1244 struct fib_rules_ops *ops;
1249 case NETDEV_REGISTER:
1250 list_for_each_entry(ops, &net->rules_ops, list)
1251 attach_rules(&ops->rules_list, dev);
1254 case NETDEV_CHANGENAME:
1255 list_for_each_entry(ops, &net->rules_ops, list) {
1256 detach_rules(&ops->rules_list, dev);
1257 attach_rules(&ops->rules_list, dev);
1261 case NETDEV_UNREGISTER:
1262 list_for_each_entry(ops, &net->rules_ops, list)
1263 detach_rules(&ops->rules_list, dev);
1270 static struct notifier_block fib_rules_notifier = {
1271 .notifier_call = fib_rules_event,
1274 static int __net_init fib_rules_net_init(struct net *net)
1276 INIT_LIST_HEAD(&net->rules_ops);
1277 spin_lock_init(&net->rules_mod_lock);
1281 static void __net_exit fib_rules_net_exit(struct net *net)
1283 WARN_ON_ONCE(!list_empty(&net->rules_ops));
1286 static struct pernet_operations fib_rules_net_ops = {
1287 .init = fib_rules_net_init,
1288 .exit = fib_rules_net_exit,
1291 static int __init fib_rules_init(void)
1294 rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, 0);
1295 rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, 0);
1296 rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, 0);
1298 err = register_pernet_subsys(&fib_rules_net_ops);
1302 err = register_netdevice_notifier(&fib_rules_notifier);
1304 goto fail_unregister;
1309 unregister_pernet_subsys(&fib_rules_net_ops);
1311 rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
1312 rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
1313 rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
1317 subsys_initcall(fib_rules_init);