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netfilter: contrack: Adding check for SIP/2.0

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Packets arriving at SIP port will now be checked for SIP/2.0 before
getting tagged as SIP packet. Added helper functions strnstr and strnstrn
for checking substring in a string in case of non null termination.

Change-Id: Ia7d6a3ac5dd1e5f0ce97ee9f6d0c13f16d9dd7f2
Acked-by: Vinisha Varre <vvarre@qti.qualcomm.com>
Signed-off-by: Paras Singh Jain <parassin@codeaurora.org>
This commit is contained in:
Paras Singh Jain 2018-01-15 16:53:18 +05:30
commit 4870530f13
1 changed files with 9 additions and 0 deletions
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9
net/netfilter/nf_conntrack_sip.c
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@ -1989,6 +1989,11 @@ static int sip_help_tcp(struct sk_buff *skb, unsigned int protoff,
datalen = skb->len - dataoff;
if (datalen < strlen("SIP/2.0 200"))
return NF_ACCEPT;
/* Check if the header contains SIP version */
if (!strnstr(dptr, "SIP/2.0", datalen))
return NF_ACCEPT;
#ifdef CONFIG_NF_CONNTRACK_SIP_SEGMENTATION
/* here we save the original datalength and data offset of the skb, this
* is needed later to split combined skbs
@ -2125,6 +2130,10 @@ static int sip_help_udp(struct sk_buff *skb, unsigned int protoff,
if (datalen < strlen("SIP/2.0 200"))
return NF_ACCEPT;
/* Check if the header contains SIP version */
if (!strnstr(dptr, "SIP/2.0", datalen))
return NF_ACCEPT;
return process_sip_msg(skb, ct, protoff, dataoff, &dptr, &datalen);
}