diff options
| author |   Jiri Benc <jbenc@redhat.com> | 2012-02-09 09:35:49 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-02-13 00:46:41 -0500 |
| commit | 4c507d2897bd9be810b3403ade73b04cf6fdfd4a (patch) | |
| tree | dfd808407a0f800195e994bb2cfc401fae23295e /net/ipv4 | |
| parent | ipv6: helper function to get tclass (diff) | |
| download | linux-dev-4c507d2897bd9be810b3403ade73b04cf6fdfd4a.tar.xz linux-dev-4c507d2897bd9be810b3403ade73b04cf6fdfd4a.zip | |
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 <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/af_inet.c | 1 | ||||
| -rw-r--r-- | net/ipv4/ip_sockglue.c | 4 | ||||
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 1 |
3 files changed, 6 insertions, 0 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index f7b5670744f0..e588a34e85c2 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 9125529dab95..ca50d9f9f8c1 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 4d6f81c818dc..94abee8cf563 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; |