Re: [PATCH] net-proc: expose the tos values in /proc/net/[tcp|udp]

From: Eric Dumazet
Date: Wed Oct 05 2011 - 05:34:18 EST

Le mardi 04 octobre 2011 Ã 10:38 -0700, MuraliRaja Muniraju a Ãcrit :
> I shall make the changes by exposing the tos values via the
> netlink as suggested. I had a doubt is I have to modify the
> inet_diag_sockid or export it via a new option. I am considering
> that adding into inet_diag_sockid is better because the latter is a
> bit of a over kill for a single value to be exposed and it also seems
> to be logical fit.
> Can you let me know your thoughts on this.

I believe you could add one "u32 tos" to struct tcp_info

[ It wont solve the UDP case, since "ss -u" still dumps /proc/net/udp
and /proc/net/udp6 ]

Following patch should handle tcp/dccp ipv4/ipv6

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 7f59ee9..eec6f3b 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -167,6 +167,7 @@ struct tcp_info {
__u32 tcpi_rcv_space;

__u32 tcpi_total_retrans;
+ __u32 tos;

/* for TCP_MD5SIG socket option */
diff --git a/net/dccp/diag.c b/net/dccp/diag.c
index b21f261..70d9498 100644
--- a/net/dccp/diag.c
+++ b/net/dccp/diag.c
@@ -37,6 +37,7 @@ static void dccp_get_info(struct sock *sk, struct tcp_info *info)

if (dp->dccps_hc_tx_ccid != NULL)
ccid_hc_tx_get_info(dp->dccps_hc_tx_ccid, sk, info);
+ info->tos = inet_sk(sk)->tos;

static void dccp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 4c0da24..b24c3d8 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2493,6 +2493,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
info->tcpi_rcv_space = tp->;

info->tcpi_total_retrans = tp->total_retrans;
+ info->tos = inet_sk(sk)->tos;

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