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authorYasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>2007-07-14 20:45:14 -0700
committerDavid S. Miller <davem@davemloft.net>2007-07-14 20:45:14 -0700
commite2a3123fbe58da9fd3f35cd242087896ace6049f (patch)
treef17f8b6f505bb50be97e204c382a92288f75c986 /net/ipv4
parentffc30690480bdd337e4914302b926d24870b56b2 (diff)
[NETFILTER]: nf_conntrack: Introduces nf_ct_get_tuplepr and uses it
nf_ct_get_tuple() requires the offset to transport header and that bothers callers such as icmp[v6] l4proto modules. This introduces new function to simplify them. Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/netfilter/nf_conntrack_proto_icmp.c32
1 files changed, 7 insertions, 25 deletions
diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
index 0fe8fb0466e..b8b79992797 100644
--- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
@@ -136,40 +136,22 @@ icmp_error_message(struct sk_buff *skb,
unsigned int hooknum)
{
struct nf_conntrack_tuple innertuple, origtuple;
- struct {
- struct icmphdr icmp;
- struct iphdr ip;
- } _in, *inside;
struct nf_conntrack_l4proto *innerproto;
struct nf_conntrack_tuple_hash *h;
- int dataoff;
NF_CT_ASSERT(skb->nfct == NULL);
- /* Not enough header? */
- inside = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_in), &_in);
- if (inside == NULL)
- return -NF_ACCEPT;
-
- /* Ignore ICMP's containing fragments (shouldn't happen) */
- if (inside->ip.frag_off & htons(IP_OFFSET)) {
- pr_debug("icmp_error_message: fragment of proto %u\n",
- inside->ip.protocol);
+ /* Are they talking about one of our connections? */
+ if (!nf_ct_get_tuplepr(skb,
+ skb_network_offset(skb) + ip_hdrlen(skb)
+ + sizeof(struct icmphdr),
+ PF_INET, &origtuple)) {
+ pr_debug("icmp_error_message: failed to get tuple\n");
return -NF_ACCEPT;
}
/* rcu_read_lock()ed by nf_hook_slow */
- innerproto = __nf_ct_l4proto_find(PF_INET, inside->ip.protocol);
-
- dataoff = ip_hdrlen(skb) + sizeof(inside->icmp);
- /* Are they talking about one of our connections? */
- if (!nf_ct_get_tuple(skb, dataoff, dataoff + inside->ip.ihl*4, PF_INET,
- inside->ip.protocol, &origtuple,
- &nf_conntrack_l3proto_ipv4, innerproto)) {
- pr_debug("icmp_error_message: ! get_tuple p=%u",
- inside->ip.protocol);
- return -NF_ACCEPT;
- }
+ innerproto = __nf_ct_l4proto_find(PF_INET, origtuple.dst.protonum);
/* Ordinarily, we'd expect the inverted tupleproto, but it's
been preserved inside the ICMP. */