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netfilter: xt_TCPMSS: SYN packets are allowed to contain data

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The TCPMSS target is dropping SYN packets where:
  1) There is data, or
  2) The data offset makes the TCP header larger than the packet.

Both of these result in an error level printk. This printk has been
removed.

This change avoids dropping SYN packets containing data. If there
is also no MSS option (as well as data), one will not be added
because of possible complications due to the increased packet size.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Simon Arlott 2010-02-02 15:33:38 +01:00 committed by Patrick McHardy
parent c30f540b63
commit 10a199394b
1 changed files with 8 additions and 10 deletions
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18
net/netfilter/xt_TCPMSS.c
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@ -60,17 +60,9 @@ tcpmss_mangle_packet(struct sk_buff *skb,
tcplen = skb->len - tcphoff;
tcph = (struct tcphdr *)(skb_network_header(skb) + tcphoff);
/* Since it passed flags test in tcp match, we know it is is
not a fragment, and has data >= tcp header length. SYN
packets should not contain data: if they did, then we risk
running over MTU, sending Frag Needed and breaking things
badly. --RR */
if (tcplen != tcph->doff*4) {
if (net_ratelimit())
printk(KERN_ERR "xt_TCPMSS: bad length (%u bytes)\n",
skb->len);
/* Header cannot be larger than the packet */
if (tcplen < tcph->doff*4)
return -1;
}
if (info->mss == XT_TCPMSS_CLAMP_PMTU) {
if (dst_mtu(skb_dst(skb)) <= minlen) {
@ -115,6 +107,12 @@ tcpmss_mangle_packet(struct sk_buff *skb,
}
}
/* There is data after the header so the option can't be added
without moving it, and doing so may make the SYN packet
itself too large. Accept the packet unmodified instead. */
if (tcplen > tcph->doff*4)
return 0;
/*
* MSS Option not found ?! add it..
*/