From: linux lover <linux_lover2004@yahoo.com>
To: linuxnet <linux-net@vger.kernel.org>
Cc: netdev <netdev@oss.sgi.com>,
netfilter <netfilter-devel@lists.netfilter.org>
Subject: how ip header added in ip_bulid_xmit function?
Date: Mon, 17 May 2004 23:31:06 -0700 (PDT) [thread overview]
Message-ID: <20040518063106.85290.qmail@web90102.mail.scd.yahoo.com> (raw)
hello ,
In ip_output.c file there is ip_build_xmit function
call. when packet comes from tcp layer to IP layer
this function is called. In that i found that
skb = sock_alloc_send_skb(sk, length+hh_len+15
,flags&MSG_DONTWAIT, &err);
staement allocates skb for packet. after that i found
that no iphdr adding statement in ip_build_xmit. i
want to know where is iphdr push to skb? cause skb
works using first alloc_skb to allocate memory then
skb_reserve to reserve headroom then put data in skb
by skb_put or skb_push for pushing headers in skb. so
there i found
skb->nh.iph = iph = (struct iphdr *)skb_put(skb,
length);
statement is this does that iphdr adding?
regards,
linuxlover
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next reply other threads:[~2004-05-18 6:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-18 6:31 linux lover [this message]
2004-05-18 14:23 ` how ip header added in ip_bulid_xmit function? Manu Garg
2004-05-19 6:20 ` linux lover
-- strict thread matches above, loose matches on Subject: below --
2004-05-19 6:27 Galy Lee
2004-05-19 10:36 ` linux lover
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