diff options
| author | KOVACS Krisztian <hidden@sch.bme.hu> | 2008-10-01 16:41:00 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-10-01 16:41:00 +0200 |
| commit | 88ef4a5a78e63420dd1dd770f1bd1dc198926b04 (patch) | |
| tree | 42409d6d26fb6f954c501ac156d34265437d18f9 /net/ipv4/tcp_ipv4.c | |
| parent | ipv4: Conditionally enable transparent flow flag when connecting (diff) | |
| download | linux-88ef4a5a78e63420dd1dd770f1bd1dc198926b04.tar.xz linux-88ef4a5a78e63420dd1dd770f1bd1dc198926b04.zip | |
tcp: Handle TCP SYN+ACK/ACK/RST transparency
The TCP stack sends out SYN+ACK/ACK/RST reply packets in response to
incoming packets. The non-local source address check on output bites
us again, as replies for transparently redirected traffic won't have a
chance to leave the node.
This patch selectively sets the FLOWI_FLAG_ANYSRC flag when doing the
route lookup for those replies. Transparent replies are enabled if the
listening socket has the transparent socket flag set.
Signed-off-by: KOVACS Krisztian <hidden@sch.bme.hu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index d13688e3558d..8b24bd833cb4 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -591,6 +591,7 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb) ip_hdr(skb)->saddr, /* XXX */ sizeof(struct tcphdr), IPPROTO_TCP, 0); arg.csumoffset = offsetof(struct tcphdr, check) / 2; + arg.flags = (sk && inet_sk(sk)->transparent) ? IP_REPLY_ARG_NOSRCCHECK : 0; net = dev_net(skb->dst->dev); ip_send_reply(net->ipv4.tcp_sock, skb, @@ -606,7 +607,8 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb) static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, int oif, - struct tcp_md5sig_key *key) + struct tcp_md5sig_key *key, + int reply_flags) { struct tcphdr *th = tcp_hdr(skb); struct { @@ -659,6 +661,7 @@ static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack, ip_hdr(skb)->daddr, &rep.th); } #endif + arg.flags = reply_flags; arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, ip_hdr(skb)->saddr, /* XXX */ arg.iov[0].iov_len, IPPROTO_TCP, 0); @@ -681,7 +684,8 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, tcptw->tw_ts_recent, tw->tw_bound_dev_if, - tcp_twsk_md5_key(tcptw) + tcp_twsk_md5_key(tcptw), + tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0 ); inet_twsk_put(tw); @@ -694,7 +698,8 @@ static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, 0, - tcp_v4_md5_do_lookup(sk, ip_hdr(skb)->daddr)); + tcp_v4_md5_do_lookup(sk, ip_hdr(skb)->daddr), + inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0); } /* @@ -1244,6 +1249,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) ireq = inet_rsk(req); ireq->loc_addr = daddr; ireq->rmt_addr = saddr; + ireq->no_srccheck = inet_sk(sk)->transparent; ireq->opt = tcp_v4_save_options(sk, skb); if (!want_cookie) TCP_ECN_create_request(req, tcp_hdr(skb)); |