From 4c507d2897bd9be810b3403ade73b04cf6fdfd4a Mon Sep 17 00:00:00 2001 From: Jiri Benc Date: Thu, 9 Feb 2012 09:35:49 +0000 Subject: net: implement IP_RECVTOS for IP_PKTOPTIONS Currently, it is not easily possible to get TOS/DSCP value of packets from an incoming TCP stream. The mechanism is there, IP_PKTOPTIONS getsockopt with IP_RECVTOS set, the same way as incoming TTL can be queried. This is not actually implemented for TOS, though. This patch adds this functionality, both for IPv4 (IP_PKTOPTIONS) and IPv6 (IPV6_2292PKTOPTIONS). For IPv4, like in the IP_RECVTTL case, the value of the TOS field is stored from the other party's ACK. This is needed for proxies which require DSCP transparency. One such example is at http://zph.bratcheda.org/. Signed-off-by: Jiri Benc Signed-off-by: David S. Miller --- net/ipv4/af_inet.c | 1 + net/ipv4/ip_sockglue.c | 4 ++++ net/ipv4/tcp_ipv4.c | 1 + 3 files changed, 6 insertions(+) (limited to 'net/ipv4') diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index f7b5670744f..e588a34e85c 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -381,6 +381,7 @@ lookup_protocol: inet->mc_all = 1; inet->mc_index = 0; inet->mc_list = NULL; + inet->rcv_tos = 0; sk_refcnt_debug_inc(sk); diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index 9125529dab9..ca50d9f9f8c 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -1289,6 +1289,10 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname, int hlim = inet->mc_ttl; put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); } + if (inet->cmsg_flags & IP_CMSG_TOS) { + int tos = inet->rcv_tos; + put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); + } len -= msg.msg_controllen; return put_user(len, optlen); } diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 4d6f81c818d..94abee8cf56 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1463,6 +1463,7 @@ struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb, ireq->opt = NULL; newinet->mc_index = inet_iif(skb); newinet->mc_ttl = ip_hdr(skb)->ttl; + newinet->rcv_tos = ip_hdr(skb)->tos; inet_csk(newsk)->icsk_ext_hdr_len = 0; if (inet_opt) inet_csk(newsk)->icsk_ext_hdr_len = inet_opt->opt.optlen; -- cgit v1.2.3-70-g09d2