[IPV4]: Add fib rule netlink notifications
To really make sense of route notifications in the presence of
multiple tables, userspace also needs to be notified about routing
rule updates. Notifications are sent to the so far unused
RTNLGRP_NOP1 (now RTNLGRP_RULE) group.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index d572d53..df0cdd4 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -839,6 +839,7 @@
#define RTMGRP_IPV4_IFADDR 0x10
#define RTMGRP_IPV4_MROUTE 0x20
#define RTMGRP_IPV4_ROUTE 0x40
+#define RTMGRP_IPV4_RULE 0x80
#define RTMGRP_IPV6_IFADDR 0x100
#define RTMGRP_IPV6_MROUTE 0x200
@@ -869,7 +870,8 @@
#define RTNLGRP_IPV4_MROUTE RTNLGRP_IPV4_MROUTE
RTNLGRP_IPV4_ROUTE,
#define RTNLGRP_IPV4_ROUTE RTNLGRP_IPV4_ROUTE
- RTNLGRP_NOP1,
+ RTNLGRP_IPV4_RULE,
+#define RTNLGRP_IPV4_RULE RTNLGRP_IPV4_RULE
RTNLGRP_IPV6_IFADDR,
#define RTNLGRP_IPV6_IFADDR RTNLGRP_IPV6_IFADDR
RTNLGRP_IPV6_MROUTE,
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index 768e8f5..ec566f3 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -104,6 +104,8 @@
/* writer func called from netlink -- rtnl_sem hold*/
+static void rtmsg_rule(int, struct fib_rule *);
+
int inet_rtm_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
struct rtattr **rta = arg;
@@ -131,6 +133,7 @@
hlist_del_rcu(&r->hlist);
r->r_dead = 1;
+ rtmsg_rule(RTM_DELRULE, r);
fib_rule_put(r);
err = 0;
break;
@@ -253,6 +256,7 @@
else
hlist_add_before_rcu(&new_r->hlist, &r->hlist);
+ rtmsg_rule(RTM_NEWRULE, new_r);
return 0;
}
@@ -382,14 +386,14 @@
static __inline__ int inet_fill_rule(struct sk_buff *skb,
struct fib_rule *r,
- struct netlink_callback *cb,
+ u32 pid, u32 seq, int event,
unsigned int flags)
{
struct rtmsg *rtm;
struct nlmsghdr *nlh;
unsigned char *b = skb->tail;
- nlh = NLMSG_NEW_ANSWER(skb, cb, RTM_NEWRULE, sizeof(*rtm), flags);
+ nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*rtm), flags);
rtm = NLMSG_DATA(nlh);
rtm->rtm_family = AF_INET;
rtm->rtm_dst_len = r->r_dst_len;
@@ -430,6 +434,21 @@
/* callers should hold rtnl semaphore */
+static void rtmsg_rule(int event, struct fib_rule *r)
+{
+ int size = NLMSG_SPACE(sizeof(struct rtmsg) + 128);
+ struct sk_buff *skb = alloc_skb(size, GFP_KERNEL);
+
+ if (!skb)
+ netlink_set_err(rtnl, 0, RTNLGRP_IPV4_RULE, ENOBUFS);
+ else if (inet_fill_rule(skb, r, 0, 0, event, 0) < 0) {
+ kfree_skb(skb);
+ netlink_set_err(rtnl, 0, RTNLGRP_IPV4_RULE, EINVAL);
+ } else {
+ netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV4_RULE, GFP_KERNEL);
+ }
+}
+
int inet_dump_rules(struct sk_buff *skb, struct netlink_callback *cb)
{
int idx = 0;
@@ -442,7 +461,9 @@
if (idx < s_idx)
continue;
- if (inet_fill_rule(skb, r, cb, NLM_F_MULTI) < 0)
+ if (inet_fill_rule(skb, r, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWRULE, NLM_F_MULTI) < 0)
break;
idx++;
}