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authorDavid S. Miller <davem@davemloft.net>2012-07-16 03:28:06 -0700
committerDavid S. Miller <davem@davemloft.net>2012-07-16 03:28:06 -0700
commit80d0a69fc57715dc9080c0567df1ed911b78abea (patch)
treefeb310b5075d3a4f118fcdde7bc44970b1c3f07e /net/ipv4/inet_connection_sock.c
parent141e369de698f2e17bf716b83fcc647ddcb2220c (diff)
downloadop-kernel-dev-80d0a69fc57715dc9080c0567df1ed911b78abea.zip
op-kernel-dev-80d0a69fc57715dc9080c0567df1ed911b78abea.tar.gz
ipv4: Add helper inet_csk_update_pmtu().
This abstracts away the call to dst_ops->update_pmtu() so that we can transparently handle the fact that, in the future, the dst itself can be invalidated by the PMTU update (when we have non-host routes cached in sockets). So we try to rebuild the socket cached route after the method invocation if necessary. This isn't used by SCTP because it needs to cache dsts per-transport, and thus will need it's own local version of this helper. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_connection_sock.c')
-rw-r--r--net/ipv4/inet_connection_sock.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 76825be..200d218 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -803,3 +803,49 @@ int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
}
EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt);
#endif
+
+static struct dst_entry *inet_csk_rebuild_route(struct sock *sk, struct flowi *fl)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ip_options_rcu *inet_opt;
+ __be32 daddr = inet->inet_daddr;
+ struct flowi4 *fl4;
+ struct rtable *rt;
+
+ rcu_read_lock();
+ inet_opt = rcu_dereference(inet->inet_opt);
+ if (inet_opt && inet_opt->opt.srr)
+ daddr = inet_opt->opt.faddr;
+ fl4 = &fl->u.ip4;
+ rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr,
+ inet->inet_saddr, inet->inet_dport,
+ inet->inet_sport, sk->sk_protocol,
+ RT_CONN_FLAGS(sk), sk->sk_bound_dev_if);
+ if (IS_ERR(rt))
+ rt = NULL;
+ if (rt)
+ sk_setup_caps(sk, &rt->dst);
+ rcu_read_unlock();
+
+ return &rt->dst;
+}
+
+struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu)
+{
+ struct dst_entry *dst = __sk_dst_check(sk, 0);
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (!dst) {
+ dst = inet_csk_rebuild_route(sk, &inet->cork.fl);
+ if (!dst)
+ goto out;
+ }
+ dst->ops->update_pmtu(dst, mtu);
+
+ dst = __sk_dst_check(sk, 0);
+ if (!dst)
+ dst = inet_csk_rebuild_route(sk, &inet->cork.fl);
+out:
+ return dst;
+}
+EXPORT_SYMBOL_GPL(inet_csk_update_pmtu);
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