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authorIdo Schimmel <idosch@mellanox.com>2017-08-03 13:28:17 +0200
committerDavid S. Miller <davem@davemloft.net>2017-08-03 15:36:00 -0700
commitdf77fe4d9865c6354372876632bcbceeda84f6c8 (patch)
tree8a4f9eeb5ac38c657d291e99a698eb7876a94c26 /net/ipv6/ip6_fib.c
parent16ab6d7d4d8cc037bb4be12c2b849ac92787e1ff (diff)
ipv6: fib: Add in-kernel notifications for route add / delete
As with IPv4, allow listeners of the FIB notification chain to receive notifications whenever a route is added, replaced or deleted. This is done by placing calls to the FIB notification chain in the two lowest level functions that end up performing these operations - namely, fib6_add_rt2node() and fib6_del_route(). Unlike IPv4, APPEND notifications aren't sent as the kernel doesn't distinguish between "append" (NLM_F_CREATE|NLM_F_APPEND) and "prepend" (NLM_F_CREATE). If NLM_F_EXCL isn't set, duplicate routes are always added after the existing duplicate routes. Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ip6_fib.c')
-rw-r--r--net/ipv6/ip6_fib.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index f93976e3f65c..595a57cbbc7b 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -33,6 +33,7 @@
#include <net/ndisc.h>
#include <net/addrconf.h>
#include <net/lwtunnel.h>
+#include <net/fib_notifier.h>
#include <net/ip6_fib.h>
#include <net/ip6_route.h>
@@ -302,6 +303,17 @@ static void __net_init fib6_tables_init(struct net *net)
#endif
+static int call_fib6_entry_notifiers(struct net *net,
+ enum fib_event_type event_type,
+ struct rt6_info *rt)
+{
+ struct fib6_entry_notifier_info info = {
+ .rt = rt,
+ };
+
+ return call_fib6_notifiers(net, event_type, &info.info);
+}
+
static int fib6_dump_node(struct fib6_walker *w)
{
int res;
@@ -879,6 +891,8 @@ add:
*ins = rt;
rt->rt6i_node = fn;
atomic_inc(&rt->rt6i_ref);
+ call_fib6_entry_notifiers(info->nl_net, FIB_EVENT_ENTRY_ADD,
+ rt);
if (!info->skip_notify)
inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
info->nl_net->ipv6.rt6_stats->fib_rt_entries++;
@@ -906,6 +920,8 @@ add:
rt->rt6i_node = fn;
rt->dst.rt6_next = iter->dst.rt6_next;
atomic_inc(&rt->rt6i_ref);
+ call_fib6_entry_notifiers(info->nl_net, FIB_EVENT_ENTRY_REPLACE,
+ rt);
if (!info->skip_notify)
inet6_rt_notify(RTM_NEWROUTE, rt, info, NLM_F_REPLACE);
if (!(fn->fn_flags & RTN_RTINFO)) {
@@ -1459,6 +1475,7 @@ static void fib6_del_route(struct fib6_node *fn, struct rt6_info **rtp,
fib6_purge_rt(rt, fn, net);
+ call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, rt);
if (!info->skip_notify)
inet6_rt_notify(RTM_DELROUTE, rt, info, 0);
rt6_release(rt);