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authorIdo Schimmel <idosch@mellanox.com>2019-12-14 17:53:11 +0200
committerDavid S. Miller <davem@davemloft.net>2019-12-16 16:14:42 -0800
commitf613b6e2ffe13e9acba0d330a058b87aa0e19a2a (patch)
tree4731be7e19ea0c157d22b3e9839c8cc4f0fd9937 /net/ipv4/fib_trie.c
parentipv4: Notify newly added route if should be offloaded (diff)
downloadlinux-dev-f613b6e2ffe13e9acba0d330a058b87aa0e19a2a.tar.xz
linux-dev-f613b6e2ffe13e9acba0d330a058b87aa0e19a2a.zip
ipv4: Handle route deletion notification
When a route is deleted we potentially need to promote the next route in the FIB alias list (e.g., with an higher metric). In case we find such a route, a replace notification is emitted. Otherwise, a delete notification for the deleted route. v2: * Convert to use fib_find_alias() instead of fib_find_first_alias() Signed-off-by: Ido Schimmel <idosch@mellanox.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/fib_trie.c')
-rw-r--r--net/ipv4/fib_trie.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index f56945d00d7a..012aca433a91 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1570,6 +1570,36 @@ static void fib_remove_alias(struct trie *t, struct key_vector *tp,
node_pull_suffix(tp, fa->fa_slen);
}
+static void fib_notify_alias_delete(struct net *net, u32 key,
+ struct hlist_head *fah,
+ struct fib_alias *fa_to_delete,
+ struct netlink_ext_ack *extack)
+{
+ struct fib_alias *fa_next, *fa_to_notify;
+ u32 tb_id = fa_to_delete->tb_id;
+ u8 slen = fa_to_delete->fa_slen;
+ enum fib_event_type fib_event;
+
+ /* Do not notify if we do not care about the route. */
+ if (fib_find_alias(fah, slen, 0, 0, tb_id, true) != fa_to_delete)
+ return;
+
+ /* Determine if the route should be replaced by the next route in the
+ * list.
+ */
+ fa_next = hlist_entry_safe(fa_to_delete->fa_list.next,
+ struct fib_alias, fa_list);
+ if (fa_next && fa_next->fa_slen == slen && fa_next->tb_id == tb_id) {
+ fib_event = FIB_EVENT_ENTRY_REPLACE_TMP;
+ fa_to_notify = fa_next;
+ } else {
+ fib_event = FIB_EVENT_ENTRY_DEL_TMP;
+ fa_to_notify = fa_to_delete;
+ }
+ call_fib_entry_notifiers(net, fib_event, key, KEYLENGTH - slen,
+ fa_to_notify, extack);
+}
+
/* Caller must hold RTNL. */
int fib_table_delete(struct net *net, struct fib_table *tb,
struct fib_config *cfg, struct netlink_ext_ack *extack)
@@ -1623,6 +1653,7 @@ int fib_table_delete(struct net *net, struct fib_table *tb,
if (!fa_to_delete)
return -ESRCH;
+ fib_notify_alias_delete(net, key, &l->leaf, fa_to_delete, extack);
call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, key, plen,
fa_to_delete, extack);
rtmsg_fib(RTM_DELROUTE, htonl(key), fa_to_delete, plen, tb->tb_id,