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authorDavid S. Miller <davem@davemloft.net>2011-04-26 13:28:44 -0700
committerDavid S. Miller <davem@davemloft.net>2011-04-27 13:59:04 -0700
commit2d7192d6cbab20e153c47fa1559ffd41ceef0e79 (patch)
treeaac4c4132f5b4a173ad8f8d0bf24427e039bbc89 /net/ipv4/tcp_ipv4.c
parent15ecd039b7182d725f4294e01f2fb12c3a88db17 (diff)
ipv4: Sanitize and simplify ip_route_{connect,newports}()
These functions are used together as a unit for route resolution during connect(). They address the chicken-and-egg problem that exists when ports need to be allocated during connect() processing, yet such port allocations require addressing information from the routing code. It's currently more heavy handed than it needs to be, and in particular we allocate and initialize a flow object twice. Let the callers provide the on-stack flow object. That way we only need to initialize it once in the ip_route_connect() call. Later, if ip_route_newports() needs to do anything, it re-uses that flow object as-is except for the ports which it updates before the route re-lookup. Also, describe why this set of facilities are needed and how it works in a big comment. Signed-off-by: David S. Miller <davem@davemloft.net> Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com>
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
-rw-r--r--net/ipv4/tcp_ipv4.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index edf18bd74b8..310454c2f4d 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -146,12 +146,13 @@ EXPORT_SYMBOL_GPL(tcp_twsk_unique);
/* This will initiate an outgoing connection. */
int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
+ struct sockaddr_in *usin = (struct sockaddr_in *)uaddr;
struct inet_sock *inet = inet_sk(sk);
struct tcp_sock *tp = tcp_sk(sk);
- struct sockaddr_in *usin = (struct sockaddr_in *)uaddr;
__be16 orig_sport, orig_dport;
- struct rtable *rt;
__be32 daddr, nexthop;
+ struct flowi4 fl4;
+ struct rtable *rt;
int err;
if (addr_len < sizeof(struct sockaddr_in))
@@ -169,7 +170,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
orig_sport = inet->inet_sport;
orig_dport = usin->sin_port;
- rt = ip_route_connect(nexthop, inet->inet_saddr,
+ rt = ip_route_connect(&fl4, nexthop, inet->inet_saddr,
RT_CONN_FLAGS(sk), sk->sk_bound_dev_if,
IPPROTO_TCP,
orig_sport, orig_dport, sk, true);
@@ -236,8 +237,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
if (err)
goto failure;
- rt = ip_route_newports(rt, IPPROTO_TCP,
- orig_sport, orig_dport,
+ rt = ip_route_newports(&fl4, rt, orig_sport, orig_dport,
inet->inet_sport, inet->inet_dport, sk);
if (IS_ERR(rt)) {
err = PTR_ERR(rt);