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>
This commit is contained in:
Jiri Pirko
David S. Miller
parent
eb523f42d7
commit
b90eb75494
@ -22,6 +22,7 @@
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#include <net/fib_rules.h>
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#include <net/inetpeer.h>
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#include <linux/percpu.h>
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#include <linux/notifier.h>
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struct fib_config {
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u8 fc_dst_len;
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@ -185,6 +186,33 @@ __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
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#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
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FIB_RES_SADDR(net, res))
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struct fib_notifier_info {
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struct net *net;
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};
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struct fib_entry_notifier_info {
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struct fib_notifier_info info; /* must be first */
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u32 dst;
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int dst_len;
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struct fib_info *fi;
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u8 tos;
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u8 type;
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u32 tb_id;
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u32 nlflags;
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};
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enum fib_event_type {
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FIB_EVENT_ENTRY_ADD,
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FIB_EVENT_ENTRY_DEL,
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FIB_EVENT_RULE_ADD,
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FIB_EVENT_RULE_DEL,
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};
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int register_fib_notifier(struct notifier_block *nb);
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int unregister_fib_notifier(struct notifier_block *nb);
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int call_fib_notifiers(struct net *net, enum fib_event_type event_type,
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struct fib_notifier_info *info);
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struct fib_table {
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struct hlist_node tb_hlist;
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u32 tb_id;
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@ -196,11 +224,11 @@ struct fib_table {
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int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
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struct fib_result *res, int fib_flags);
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int fib_table_insert(struct fib_table *, struct fib_config *);
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int fib_table_delete(struct fib_table *, struct fib_config *);
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int fib_table_insert(struct net *, struct fib_table *, struct fib_config *);
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int fib_table_delete(struct net *, struct fib_table *, struct fib_config *);
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int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
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struct netlink_callback *cb);
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int fib_table_flush(struct fib_table *table);
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int fib_table_flush(struct net *net, struct fib_table *table);
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struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
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void fib_table_flush_external(struct fib_table *table);
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void fib_free_table(struct fib_table *tb);
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@ -182,7 +182,7 @@ static void fib_flush(struct net *net)
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struct fib_table *tb;
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hlist_for_each_entry_safe(tb, tmp, head, tb_hlist)
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flushed += fib_table_flush(tb);
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flushed += fib_table_flush(net, tb);
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}
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if (flushed)
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@ -590,13 +590,13 @@ int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg)
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if (cmd == SIOCDELRT) {
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tb = fib_get_table(net, cfg.fc_table);
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if (tb)
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err = fib_table_delete(tb, &cfg);
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err = fib_table_delete(net, tb, &cfg);
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else
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err = -ESRCH;
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} else {
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tb = fib_new_table(net, cfg.fc_table);
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if (tb)
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err = fib_table_insert(tb, &cfg);
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err = fib_table_insert(net, tb, &cfg);
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else
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err = -ENOBUFS;
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}
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@ -719,7 +719,7 @@ static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
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goto errout;
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}
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err = fib_table_delete(tb, &cfg);
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err = fib_table_delete(net, tb, &cfg);
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errout:
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return err;
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}
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@ -741,7 +741,7 @@ static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
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goto errout;
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}
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err = fib_table_insert(tb, &cfg);
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err = fib_table_insert(net, tb, &cfg);
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errout:
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return err;
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}
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@ -828,9 +828,9 @@ static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifad
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cfg.fc_scope = RT_SCOPE_HOST;
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if (cmd == RTM_NEWROUTE)
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fib_table_insert(tb, &cfg);
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fib_table_insert(net, tb, &cfg);
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else
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fib_table_delete(tb, &cfg);
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fib_table_delete(net, tb, &cfg);
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}
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void fib_add_ifaddr(struct in_ifaddr *ifa)
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@ -1254,7 +1254,7 @@ static void ip_fib_net_exit(struct net *net)
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hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) {
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hlist_del(&tb->tb_hlist);
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fib_table_flush(tb);
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fib_table_flush(net, tb);
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fib_free_table(tb);
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}
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}
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@ -164,6 +164,14 @@ static struct fib_table *fib_empty_table(struct net *net)
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return NULL;
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}
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static int call_fib_rule_notifiers(struct net *net,
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enum fib_event_type event_type)
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{
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struct fib_notifier_info info;
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return call_fib_notifiers(net, event_type, &info);
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}
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static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = {
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FRA_GENERIC_POLICY,
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[FRA_FLOW] = { .type = NLA_U32 },
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@ -221,6 +229,7 @@ static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
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net->ipv4.fib_has_custom_rules = true;
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fib_flush_external(rule->fr_net);
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call_fib_rule_notifiers(net, FIB_EVENT_RULE_ADD);
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err = 0;
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errout:
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@ -243,6 +252,7 @@ static int fib4_rule_delete(struct fib_rule *rule)
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#endif
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net->ipv4.fib_has_custom_rules = true;
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fib_flush_external(rule->fr_net);
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call_fib_rule_notifiers(net, FIB_EVENT_RULE_DEL);
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errout:
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return err;
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}
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@ -73,6 +73,7 @@
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/vmalloc.h>
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#include <linux/notifier.h>
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#include <net/net_namespace.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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@ -84,6 +85,44 @@
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#include <trace/events/fib.h>
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#include "fib_lookup.h"
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static BLOCKING_NOTIFIER_HEAD(fib_chain);
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int register_fib_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&fib_chain, nb);
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}
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EXPORT_SYMBOL(register_fib_notifier);
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int unregister_fib_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&fib_chain, nb);
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}
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EXPORT_SYMBOL(unregister_fib_notifier);
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int call_fib_notifiers(struct net *net, enum fib_event_type event_type,
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struct fib_notifier_info *info)
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{
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info->net = net;
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return blocking_notifier_call_chain(&fib_chain, event_type, info);
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}
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static int call_fib_entry_notifiers(struct net *net,
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enum fib_event_type event_type, u32 dst,
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int dst_len, struct fib_info *fi,
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u8 tos, u8 type, u32 tb_id, u32 nlflags)
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{
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struct fib_entry_notifier_info info = {
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.dst = dst,
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.dst_len = dst_len,
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.fi = fi,
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.tos = tos,
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.type = type,
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.tb_id = tb_id,
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.nlflags = nlflags,
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};
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return call_fib_notifiers(net, event_type, &info.info);
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}
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#define MAX_STAT_DEPTH 32
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#define KEYLENGTH (8*sizeof(t_key))
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@ -1076,7 +1115,8 @@ static int fib_insert_alias(struct trie *t, struct key_vector *tp,
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}
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/* Caller must hold RTNL. */
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int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
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int fib_table_insert(struct net *net, struct fib_table *tb,
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struct fib_config *cfg)
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{
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struct trie *t = (struct trie *)tb->tb_data;
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struct fib_alias *fa, *new_fa;
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@ -1193,6 +1233,11 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
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fib_release_info(fi_drop);
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if (state & FA_S_ACCESSED)
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rt_cache_flush(cfg->fc_nlinfo.nl_net);
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call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_ADD,
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key, plen, fi,
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new_fa->fa_tos, cfg->fc_type,
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tb->tb_id, cfg->fc_nlflags);
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rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen,
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tb->tb_id, &cfg->fc_nlinfo, nlflags);
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@ -1245,6 +1290,8 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
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tb->tb_num_default++;
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rt_cache_flush(cfg->fc_nlinfo.nl_net);
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call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, key, plen, fi, tos,
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cfg->fc_type, tb->tb_id, cfg->fc_nlflags);
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rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, new_fa->tb_id,
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&cfg->fc_nlinfo, nlflags);
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succeeded:
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@ -1490,7 +1537,8 @@ static void fib_remove_alias(struct trie *t, struct key_vector *tp,
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}
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/* Caller must hold RTNL. */
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int fib_table_delete(struct fib_table *tb, struct fib_config *cfg)
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int fib_table_delete(struct net *net, struct fib_table *tb,
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struct fib_config *cfg)
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{
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struct trie *t = (struct trie *) tb->tb_data;
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struct fib_alias *fa, *fa_to_delete;
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@ -1546,6 +1594,9 @@ int fib_table_delete(struct fib_table *tb, struct fib_config *cfg)
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switchdev_fib_ipv4_del(key, plen, fa_to_delete->fa_info, tos,
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cfg->fc_type, tb->tb_id);
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call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, key, plen,
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fa_to_delete->fa_info, tos, cfg->fc_type,
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tb->tb_id, 0);
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rtmsg_fib(RTM_DELROUTE, htonl(key), fa_to_delete, plen, tb->tb_id,
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&cfg->fc_nlinfo, 0);
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@ -1809,7 +1860,7 @@ void fib_table_flush_external(struct fib_table *tb)
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}
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/* Caller must hold RTNL. */
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int fib_table_flush(struct fib_table *tb)
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int fib_table_flush(struct net *net, struct fib_table *tb)
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{
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struct trie *t = (struct trie *)tb->tb_data;
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struct key_vector *pn = t->kv;
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@ -1861,6 +1912,11 @@ int fib_table_flush(struct fib_table *tb)
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switchdev_fib_ipv4_del(n->key, KEYLENGTH - fa->fa_slen,
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fi, fa->fa_tos, fa->fa_type,
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tb->tb_id);
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call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_DEL,
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n->key,
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KEYLENGTH - fa->fa_slen,
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fi, fa->fa_tos, fa->fa_type,
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tb->tb_id, 0);
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hlist_del_rcu(&fa->fa_list);
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fib_release_info(fa->fa_info);
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alias_free_mem_rcu(fa);
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