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[NETFILTER]: nf_conntrack_sip: parse SIP headers properly

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Introduce new function for SIP header parsing that properly deals with
continuation lines and whitespace in headers and use it.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy
2008-03-25 20:18:57 -07:00
committed by David S. Miller
parent ac3677406d
commit ea45f12a27
3 changed files with 152 additions and 169 deletions
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18
net/ipv4/netfilter/nf_nat_sip.c
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@@ -108,14 +108,14 @@ static int map_addr(struct sk_buff *skb,
static int map_sip_addr(struct sk_buff *skb,
const char **dptr, unsigned int *datalen,
enum sip_header_pos pos, struct addr_map *map)
enum sip_header_types type, struct addr_map *map)
{
enum ip_conntrack_info ctinfo;
struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
unsigned int matchlen, matchoff;
if (ct_sip_get_info(ct, *dptr, *datalen, &matchoff, &matchlen,
pos) <= 0)
if (ct_sip_get_header(ct, *dptr, 0, *datalen, type,
&matchoff, &matchlen) <= 0)
return 1;
return map_addr(skb, dptr, datalen, matchoff, matchlen, map);
}
@@ -141,10 +141,10 @@ static unsigned int ip_nat_sip(struct sk_buff *skb,
return NF_DROP;
}
if (!map_sip_addr(skb, dptr, datalen, POS_FROM, &map) ||
!map_sip_addr(skb, dptr, datalen, POS_TO, &map) ||
!map_sip_addr(skb, dptr, datalen, POS_VIA, &map) ||
!map_sip_addr(skb, dptr, datalen, POS_CONTACT, &map))
if (!map_sip_addr(skb, dptr, datalen, SIP_HDR_FROM, &map) ||
!map_sip_addr(skb, dptr, datalen, SIP_HDR_TO, &map) ||
!map_sip_addr(skb, dptr, datalen, SIP_HDR_VIA, &map) ||
!map_sip_addr(skb, dptr, datalen, SIP_HDR_CONTACT, &map))
return NF_DROP;
return NF_ACCEPT;
}
@@ -166,8 +166,8 @@ static int mangle_content_len(struct sk_buff *skb,
c_len = *datalen - matchoff + strlen("v=");
/* Now, update SDP length */
if (ct_sip_get_info(ct, *dptr, *datalen, &matchoff, &matchlen,
POS_CONTENT) <= 0)
if (ct_sip_get_header(ct, *dptr, 0, *datalen, SIP_HDR_CONTENT_LENGTH,
&matchoff, &matchlen) <= 0)
return 0;
buflen = sprintf(buffer, "%u", c_len);