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msm: netfilter: changes to handle contact address modification in SIP ALG 

SIP ALG mangles contact address only when both address and port are
mentioned. Some clients send only address information in which case
the contact address does not get mangled an hence SIP call does not
get established.

Change-Id: Ie760f6fcc6dd8e269b057488414b23beff4e8fc3
Signed-off-by: Ravinder Konka <rkonka@codeaurora.org>
This commit is contained in:
Ravinder Konka 2015-01-22 11:42:52 +05:30 committed by Gerrit - the friendly Code Review server
parent 7d835ddeea
commit 1b12c2cf40
1 changed files with 14 additions and 1 deletions
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15
net/netfilter/nf_nat_sip.c
View File

@ -110,13 +110,26 @@ static int map_addr(struct sk_buff *skb, unsigned int protoff,
newaddr = ct->tuplehash[!dir].tuple.src.u3;
newport = ct_sip_info->forced_dport ? :
ct->tuplehash[!dir].tuple.src.u.udp.port;
} else if (nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3, addr) &&
ct->tuplehash[dir].tuple.src.u.udp.port != port) {
newaddr = ct->tuplehash[!dir].tuple.dst.u3;
newport = 0;
} else if (nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3, addr)
&& ct->tuplehash[dir].tuple.dst.u.udp.port != port) {
newaddr = ct->tuplehash[!dir].tuple.src.u3;
newport = 0;
} else
return 1;
if (nf_inet_addr_cmp(&newaddr, addr) && newport == port)
return 1;
buflen = sip_sprintf_addr_port(ct, buffer, &newaddr, ntohs(newport));
if (newport == 0)
buflen = sip_sprintf_addr(ct, buffer, &newaddr, false);
else
buflen = sip_sprintf_addr_port(ct, buffer, &newaddr,
ntohs(newport));
return mangle_packet(skb, protoff, dataoff, dptr, datalen,
matchoff, matchlen, buffer, buflen);
}