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authorDavid S. Miller <davem@davemloft.net>2011-05-08 23:38:45 (GMT)
committerDavid S. Miller <davem@davemloft.net>2011-05-09 04:12:48 (GMT)
commite474995f290ff7bc236b549aa9a89ae445ee5b1b (patch)
tree50c16643d9b828d95f795863653a12739e111224 /net/ipv4
parenteed2a12f1ed9aabf0676f4d0db34aad51976c5c6 (diff)
downloadlinux-e474995f290ff7bc236b549aa9a89ae445ee5b1b.tar.xz
udp: Use flow key information instead of rt->rt_{src,dst}
We have two cases. Either the socket is in TCP_ESTABLISHED state and connect() filled in the inet socket cork flow, or we looked up the route here and used an on-stack flow. Track which one it was, and use it to obtain src/dst addrs. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/udp.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 544f435..ba9f137 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -791,6 +791,7 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
{
struct inet_sock *inet = inet_sk(sk);
struct udp_sock *up = udp_sk(sk);
+ struct flowi4 fl4_stack;
struct flowi4 *fl4;
int ulen = len;
struct ipcm_cookie ipc;
@@ -919,17 +920,18 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
if (connected)
rt = (struct rtable *)sk_dst_check(sk, 0);
+ fl4 = &inet->cork.fl.u.ip4;
if (rt == NULL) {
- struct flowi4 fl4;
struct net *net = sock_net(sk);
- flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
+ fl4 = &fl4_stack;
+ flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos,
RT_SCOPE_UNIVERSE, sk->sk_protocol,
inet_sk_flowi_flags(sk)|FLOWI_FLAG_CAN_SLEEP,
faddr, saddr, dport, inet->inet_sport);
- security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
- rt = ip_route_output_flow(net, &fl4, sk);
+ security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
+ rt = ip_route_output_flow(net, fl4, sk);
if (IS_ERR(rt)) {
err = PTR_ERR(rt);
rt = NULL;
@@ -950,9 +952,9 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
goto do_confirm;
back_from_confirm:
- saddr = rt->rt_src;
+ saddr = fl4->saddr;
if (!ipc.addr)
- daddr = ipc.addr = rt->rt_dst;
+ daddr = ipc.addr = fl4->daddr;
/* Lockless fast path for the non-corking case. */
if (!corkreq) {