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ipv6: fib: Add in-kernel notifications for route add / delete

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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>
This commit is contained in:
Ido Schimmel 2017-08-03 13:28:17 +02:00 committed by David S. Miller
parent 16ab6d7d4d
commit df77fe4d98
2 changed files with 22 additions and 0 deletions
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5
include/net/ip6_fib.h
View File

@ -258,6 +258,11 @@ typedef struct rt6_info *(*pol_lookup_t)(struct net *,
struct fib6_table *,
struct flowi6 *, int);
struct fib6_entry_notifier_info {
struct fib_notifier_info info; /* must be first */
struct rt6_info *rt;
};
/*
* exported functions
*/

17
net/ipv6/ip6_fib.c
View File

@ -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);