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authorstephen hemminger <shemminger@vyatta.com>2011-04-04 10:03:31 -0400
committerDavid S. Miller <davem@davemloft.net>2011-04-04 20:22:28 -0400
commit36fd2b63e3b4336744cf3f6a6c9543ecbec334a7 (patch)
tree0793a71cf90d8bb3ea1573564ad5bed485324396 /net/bridge/br_fdb.c
parentb078f0df676233fc7ebc1ab270bd11ef5824bb64 (diff)
bridge: allow creating/deleting fdb entries via netlink
Use RTM_NEWNEIGH and RTM_DELNEIGH to allow updating of entries in bridge forwarding table. This allows manipulating static entries which is not possible with existing tools. Example (using bridge extensions to iproute2) # br fdb add 00:02:03:04:05:06 dev eth0 Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_fdb.c')
-rw-r--r--net/bridge/br_fdb.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 5e19e61396c3..498f47c1c453 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -555,3 +555,142 @@ skip:
555 555
556 return skb->len; 556 return skb->len;
557} 557}
558
559/* Create new static fdb entry */
560static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
561 __u16 state)
562{
563 struct net_bridge *br = source->br;
564 struct hlist_head *head = &br->hash[br_mac_hash(addr)];
565 struct net_bridge_fdb_entry *fdb;
566
567 fdb = fdb_find(head, addr);
568 if (fdb)
569 return -EEXIST;
570
571 fdb = fdb_create(head, source, addr);
572 if (!fdb)
573 return -ENOMEM;
574
575 if (state & NUD_PERMANENT)
576 fdb->is_local = fdb->is_static = 1;
577 else if (state & NUD_NOARP)
578 fdb->is_static = 1;
579 return 0;
580}
581
582/* Add new permanent fdb entry with RTM_NEWNEIGH */
583int br_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
584{
585 struct net *net = sock_net(skb->sk);
586 struct ndmsg *ndm;
587 struct nlattr *tb[NDA_MAX+1];
588 struct net_device *dev;
589 struct net_bridge_port *p;
590 const __u8 *addr;
591 int err;
592
593 ASSERT_RTNL();
594 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
595 if (err < 0)
596 return err;
597
598 ndm = nlmsg_data(nlh);
599 if (ndm->ndm_ifindex == 0) {
600 pr_info("bridge: RTM_NEWNEIGH with invalid ifindex\n");
601 return -EINVAL;
602 }
603
604 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
605 if (dev == NULL) {
606 pr_info("bridge: RTM_NEWNEIGH with unknown ifindex\n");
607 return -ENODEV;
608 }
609
610 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
611 pr_info("bridge: RTM_NEWNEIGH with invalid address\n");
612 return -EINVAL;
613 }
614
615 addr = nla_data(tb[NDA_LLADDR]);
616 if (!is_valid_ether_addr(addr)) {
617 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
618 return -EINVAL;
619 }
620
621 p = br_port_get_rtnl(dev);
622 if (p == NULL) {
623 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
624 dev->name);
625 return -EINVAL;
626 }
627
628 spin_lock_bh(&p->br->hash_lock);
629 err = fdb_add_entry(p, addr, ndm->ndm_state);
630 spin_unlock_bh(&p->br->hash_lock);
631
632 return err;
633}
634
635static int fdb_delete_by_addr(struct net_bridge_port *p, const u8 *addr)
636{
637 struct net_bridge *br = p->br;
638 struct hlist_head *head = &br->hash[br_mac_hash(addr)];
639 struct net_bridge_fdb_entry *fdb;
640
641 fdb = fdb_find(head, addr);
642 if (!fdb)
643 return -ENOENT;
644
645 fdb_delete(fdb);
646 return 0;
647}
648
649/* Remove neighbor entry with RTM_DELNEIGH */
650int br_fdb_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
651{
652 struct net *net = sock_net(skb->sk);
653 struct ndmsg *ndm;
654 struct net_bridge_port *p;
655 struct nlattr *llattr;
656 const __u8 *addr;
657 struct net_device *dev;
658 int err;
659
660 ASSERT_RTNL();
661 if (nlmsg_len(nlh) < sizeof(*ndm))
662 return -EINVAL;
663
664 ndm = nlmsg_data(nlh);
665 if (ndm->ndm_ifindex == 0) {
666 pr_info("bridge: RTM_DELNEIGH with invalid ifindex\n");
667 return -EINVAL;
668 }
669
670 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
671 if (dev == NULL) {
672 pr_info("bridge: RTM_DELNEIGH with unknown ifindex\n");
673 return -ENODEV;
674 }
675
676 llattr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_LLADDR);
677 if (llattr == NULL || nla_len(llattr) != ETH_ALEN) {
678 pr_info("bridge: RTM_DELNEIGH with invalid address\n");
679 return -EINVAL;
680 }
681
682 addr = nla_data(llattr);
683
684 p = br_port_get_rtnl(dev);
685 if (p == NULL) {
686 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
687 dev->name);
688 return -EINVAL;
689 }
690
691 spin_lock_bh(&p->br->hash_lock);
692 err = fdb_delete_by_addr(p, addr);
693 spin_unlock_bh(&p->br->hash_lock);
694
695 return err;
696}