From dca8b089c95d94afa1d715df257de0286350e99d Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Thu, 24 Feb 2011 13:38:12 -0800 Subject: [PATCH] ipv4: Rearrange how ip_route_newports() gets port keys. ip_route_newports() is the only place in the entire kernel that cares about the port members in the routing cache entry's lookup flow key. Therefore the only reason we store an entire flow inside of the struct rtentry is for this one special case. Rewrite ip_route_newports() such that: 1) The caller passes in the original port values, so we don't need to use the rth->fl.fl_ip_{s,d}port values to remember them. 2) The lookup flow is constructed by hand instead of being copied from the routing cache entry's flow. Signed-off-by: David S. Miller --- include/net/route.h | 19 +++++++++++-------- net/dccp/ipv4.c | 10 +++++++--- net/ipv4/tcp_ipv4.c | 6 +++++- 3 files changed, 23 insertions(+), 12 deletions(-) diff --git a/include/net/route.h b/include/net/route.h index bf790c1c6ac8..b3f89ad04e0b 100644 --- a/include/net/route.h +++ b/include/net/route.h @@ -200,16 +200,19 @@ static inline int ip_route_connect(struct rtable **rp, __be32 dst, } static inline int ip_route_newports(struct rtable **rp, u8 protocol, + __be16 orig_sport, __be16 orig_dport, __be16 sport, __be16 dport, struct sock *sk) { - if (sport != (*rp)->fl.fl_ip_sport || - dport != (*rp)->fl.fl_ip_dport) { - struct flowi fl; - - memcpy(&fl, &(*rp)->fl, sizeof(fl)); - fl.fl_ip_sport = sport; - fl.fl_ip_dport = dport; - fl.proto = protocol; + if (sport != orig_sport || dport != orig_dport) { + struct flowi fl = { .oif = (*rp)->fl.oif, + .mark = (*rp)->fl.mark, + .fl4_dst = (*rp)->fl.fl4_dst, + .fl4_src = (*rp)->fl.fl4_src, + .fl4_tos = (*rp)->fl.fl4_tos, + .proto = (*rp)->fl.proto, + .fl_ip_sport = sport, + .fl_ip_dport = dport }; + if (inet_sk(sk)->transparent) fl.flags |= FLOWI_FLAG_ANYSRC; if (protocol == IPPROTO_TCP) diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c index 45a434f94169..937989199c80 100644 --- a/net/dccp/ipv4.c +++ b/net/dccp/ipv4.c @@ -43,6 +43,7 @@ int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) struct inet_sock *inet = inet_sk(sk); struct dccp_sock *dp = dccp_sk(sk); const struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; + __be16 orig_sport, orig_dport; struct rtable *rt; __be32 daddr, nexthop; int tmp; @@ -63,10 +64,12 @@ int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) nexthop = inet->opt->faddr; } + orig_sport = inet->inet_sport; + orig_dport = usin->sin_port; tmp = ip_route_connect(&rt, nexthop, inet->inet_saddr, RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, IPPROTO_DCCP, - inet->inet_sport, usin->sin_port, sk, 1); + orig_sport, orig_dport, sk, 1); if (tmp < 0) return tmp; @@ -99,8 +102,9 @@ int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) if (err != 0) goto failure; - err = ip_route_newports(&rt, IPPROTO_DCCP, inet->inet_sport, - inet->inet_dport, sk); + err = ip_route_newports(&rt, IPPROTO_DCCP, + orig_sport, orig_dport, + inet->inet_sport, inet->inet_dport, sk); if (err != 0) goto failure; diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index ef5a90beb9b0..27a0cc8cc888 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -149,6 +149,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 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; int tmp; @@ -167,10 +168,12 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) nexthop = inet->opt->faddr; } + orig_sport = inet->inet_sport; + orig_dport = usin->sin_port; tmp = ip_route_connect(&rt, nexthop, inet->inet_saddr, RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, IPPROTO_TCP, - inet->inet_sport, usin->sin_port, sk, 1); + orig_sport, orig_dport, sk, 1); if (tmp < 0) { if (tmp == -ENETUNREACH) IP_INC_STATS_BH(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); @@ -234,6 +237,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) goto failure; err = ip_route_newports(&rt, IPPROTO_TCP, + orig_sport, orig_dport, inet->inet_sport, inet->inet_dport, sk); if (err) goto failure; -- 2.20.1