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authorEric Dumazet <eric.dumazet@gmail.com>2011-10-24 03:06:21 -0400
committerDavid S. Miller <davem@davemloft.net>2011-10-24 03:06:21 -0400
commit66b13d99d96a1a69f47a6bc3dc47f45955967377 (patch)
treec566bee026b5e9703f789d27657aefa7c70c587c /include
parenttcp: md5: add more const attributes (diff)
downloadlinux-dev-66b13d99d96a1a69f47a6bc3dc47f45955967377.tar.xz
linux-dev-66b13d99d96a1a69f47a6bc3dc47f45955967377.zip
ipv4: tcp: fix TOS value in ACK messages sent from TIME_WAIT
There is a long standing bug in linux tcp stack, about ACK messages sent on behalf of TIME_WAIT sockets. In the IP header of the ACK message, we choose to reflect TOS field of incoming message, and this might break some setups. Example of things that were broken : - Routing using TOS as a selector - Firewalls - Trafic classification / shaping We now remember in timewait structure the inet tos field and use it in ACK generation, and route lookup. Notes : - We still reflect incoming TOS in RST messages. - We could extend MuraliRaja Muniraju patch to report TOS value in netlink messages for TIME_WAIT sockets. - A patch is needed for IPv6 Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--include/net/inet_timewait_sock.h3
-rw-r--r--include/net/ip.h3
2 files changed, 4 insertions, 2 deletions
diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h
index f1a770977c4f..180231c5bbbe 100644
--- a/include/net/inet_timewait_sock.h
+++ b/include/net/inet_timewait_sock.h
@@ -126,7 +126,8 @@ struct inet_timewait_sock {
/* And these are ours. */
unsigned int tw_ipv6only : 1,
tw_transparent : 1,
- tw_pad : 14, /* 14 bits hole */
+ tw_pad : 6, /* 6 bits hole */
+ tw_tos : 8,
tw_ipv6_offset : 16;
kmemcheck_bitfield_end(flags);
unsigned long tw_ttd;
diff --git a/include/net/ip.h b/include/net/ip.h
index c7e066a1c611..eca0ef7a495e 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -165,6 +165,7 @@ struct ip_reply_arg {
int csumoffset; /* u16 offset of csum in iov[0].iov_base */
/* -1 if not needed */
int bound_dev_if;
+ u8 tos;
};
#define IP_REPLY_ARG_NOSRCCHECK 1
@@ -175,7 +176,7 @@ static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
}
void ip_send_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr,
- struct ip_reply_arg *arg, unsigned int len);
+ const struct ip_reply_arg *arg, unsigned int len);
struct ipv4_config {
int log_martians;