fib: introduce FIB notification infrastructure
This allows to pass information about added/deleted FIB entries/rules to
whoever is interested. This is done in a very similar way as devinet
notifies address additions/removals.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 241f27b..51a4537 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -73,6 +73,7 @@
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/vmalloc.h>
+#include <linux/notifier.h>
#include <net/net_namespace.h>
#include <net/ip.h>
#include <net/protocol.h>
@@ -84,6 +85,44 @@
#include <trace/events/fib.h>
#include "fib_lookup.h"
+static BLOCKING_NOTIFIER_HEAD(fib_chain);
+
+int register_fib_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&fib_chain, nb);
+}
+EXPORT_SYMBOL(register_fib_notifier);
+
+int unregister_fib_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&fib_chain, nb);
+}
+EXPORT_SYMBOL(unregister_fib_notifier);
+
+int call_fib_notifiers(struct net *net, enum fib_event_type event_type,
+ struct fib_notifier_info *info)
+{
+ info->net = net;
+ return blocking_notifier_call_chain(&fib_chain, event_type, info);
+}
+
+static int call_fib_entry_notifiers(struct net *net,
+ enum fib_event_type event_type, u32 dst,
+ int dst_len, struct fib_info *fi,
+ u8 tos, u8 type, u32 tb_id, u32 nlflags)
+{
+ struct fib_entry_notifier_info info = {
+ .dst = dst,
+ .dst_len = dst_len,
+ .fi = fi,
+ .tos = tos,
+ .type = type,
+ .tb_id = tb_id,
+ .nlflags = nlflags,
+ };
+ return call_fib_notifiers(net, event_type, &info.info);
+}
+
#define MAX_STAT_DEPTH 32
#define KEYLENGTH (8*sizeof(t_key))
@@ -1076,7 +1115,8 @@
}
/* Caller must hold RTNL. */
-int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
+int fib_table_insert(struct net *net, struct fib_table *tb,
+ struct fib_config *cfg)
{
struct trie *t = (struct trie *)tb->tb_data;
struct fib_alias *fa, *new_fa;
@@ -1193,6 +1233,11 @@
fib_release_info(fi_drop);
if (state & FA_S_ACCESSED)
rt_cache_flush(cfg->fc_nlinfo.nl_net);
+
+ call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_ADD,
+ key, plen, fi,
+ new_fa->fa_tos, cfg->fc_type,
+ tb->tb_id, cfg->fc_nlflags);
rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen,
tb->tb_id, &cfg->fc_nlinfo, nlflags);
@@ -1245,6 +1290,8 @@
tb->tb_num_default++;
rt_cache_flush(cfg->fc_nlinfo.nl_net);
+ call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, key, plen, fi, tos,
+ cfg->fc_type, tb->tb_id, cfg->fc_nlflags);
rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, new_fa->tb_id,
&cfg->fc_nlinfo, nlflags);
succeeded:
@@ -1490,7 +1537,8 @@
}
/* Caller must hold RTNL. */
-int fib_table_delete(struct fib_table *tb, struct fib_config *cfg)
+int fib_table_delete(struct net *net, struct fib_table *tb,
+ struct fib_config *cfg)
{
struct trie *t = (struct trie *) tb->tb_data;
struct fib_alias *fa, *fa_to_delete;
@@ -1546,6 +1594,9 @@
switchdev_fib_ipv4_del(key, plen, fa_to_delete->fa_info, tos,
cfg->fc_type, tb->tb_id);
+ call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, key, plen,
+ fa_to_delete->fa_info, tos, cfg->fc_type,
+ tb->tb_id, 0);
rtmsg_fib(RTM_DELROUTE, htonl(key), fa_to_delete, plen, tb->tb_id,
&cfg->fc_nlinfo, 0);
@@ -1809,7 +1860,7 @@
}
/* Caller must hold RTNL. */
-int fib_table_flush(struct fib_table *tb)
+int fib_table_flush(struct net *net, struct fib_table *tb)
{
struct trie *t = (struct trie *)tb->tb_data;
struct key_vector *pn = t->kv;
@@ -1861,6 +1912,11 @@
switchdev_fib_ipv4_del(n->key, KEYLENGTH - fa->fa_slen,
fi, fa->fa_tos, fa->fa_type,
tb->tb_id);
+ call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_DEL,
+ n->key,
+ KEYLENGTH - fa->fa_slen,
+ fi, fa->fa_tos, fa->fa_type,
+ tb->tb_id, 0);
hlist_del_rcu(&fa->fa_list);
fib_release_info(fa->fa_info);
alias_free_mem_rcu(fa);