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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
parentffc30690480bdd337e4914302b926d24870b56b2 (diff)
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[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>
-rw-r--r--include/net/netfilter/nf_conntrack.h4
-rw-r--r--net/ipv4/netfilter/nf_conntrack_proto_icmp.c32
-rw-r--r--net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c42
-rw-r--r--net/netfilter/nf_conntrack_core.c30
4 files changed, 49 insertions, 59 deletions
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index d4f02eb0c66c..810020ec345d 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -186,6 +186,10 @@ extern void nf_conntrack_hash_insert(struct nf_conn *ct);
extern void nf_conntrack_flush(void);
+extern int nf_ct_get_tuplepr(const struct sk_buff *skb,
+ unsigned int nhoff,
+ u_int16_t l3num,
+ struct nf_conntrack_tuple *tuple);
extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
const struct nf_conntrack_tuple *orig);
diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
index 0fe8fb0466ef..b8b79992797e 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. */
diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
index 9defc7e14554..0fca7e8abeb7 100644
--- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
@@ -136,49 +136,23 @@ icmpv6_error_message(struct sk_buff *skb,
{
struct nf_conntrack_tuple intuple, origtuple;
struct nf_conntrack_tuple_hash *h;
- struct icmp6hdr _hdr, *hp;
- unsigned int inip6off;
struct nf_conntrack_l4proto *inproto;
- u_int8_t inprotonum;
- unsigned int inprotoff;
NF_CT_ASSERT(skb->nfct == NULL);
- hp = skb_header_pointer(skb, icmp6off, sizeof(_hdr), &_hdr);
- if (hp == NULL) {
- pr_debug("icmpv6_error: Can't get ICMPv6 hdr.\n");
- return -NF_ACCEPT;
- }
-
- inip6off = icmp6off + sizeof(_hdr);
- if (skb_copy_bits(skb, inip6off+offsetof(struct ipv6hdr, nexthdr),
- &inprotonum, sizeof(inprotonum)) != 0) {
- pr_debug("icmpv6_error: Can't get nexthdr in inner IPv6 "
- "header.\n");
- return -NF_ACCEPT;
- }
- inprotoff = nf_ct_ipv6_skip_exthdr(skb,
- inip6off + sizeof(struct ipv6hdr),
- &inprotonum,
- skb->len - inip6off
- - sizeof(struct ipv6hdr));
-
- if ((inprotoff > skb->len) || (inprotonum == NEXTHDR_FRAGMENT)) {
- pr_debug("icmpv6_error: Can't get protocol header in ICMPv6 "
- "payload.\n");
- return -NF_ACCEPT;
- }
-
- /* rcu_read_lock()ed by nf_hook_slow */
- inproto = __nf_ct_l4proto_find(PF_INET6, inprotonum);
-
/* Are they talking about one of our connections? */
- if (!nf_ct_get_tuple(skb, inip6off, inprotoff, PF_INET6, inprotonum,
- &origtuple, &nf_conntrack_l3proto_ipv6, inproto)) {
+ if (!nf_ct_get_tuplepr(skb,
+ skb_network_offset(skb)
+ + sizeof(struct ipv6hdr)
+ + sizeof(struct icmp6hdr),
+ PF_INET6, &origtuple)) {
pr_debug("icmpv6_error: Can't get tuple\n");
return -NF_ACCEPT;
}
+ /* rcu_read_lock()ed by nf_hook_slow */
+ inproto = __nf_ct_l4proto_find(PF_INET6, origtuple.dst.protonum);
+
/* Ordinarily, we'd expect the inverted tupleproto, but it's
been preserved inside the ICMP. */
if (!nf_ct_invert_tuple(&intuple, &origtuple,
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 5b194e3c4e25..8cce814f6bee 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -113,6 +113,36 @@ nf_ct_get_tuple(const struct sk_buff *skb,
}
EXPORT_SYMBOL_GPL(nf_ct_get_tuple);
+int nf_ct_get_tuplepr(const struct sk_buff *skb,
+ unsigned int nhoff,
+ u_int16_t l3num,
+ struct nf_conntrack_tuple *tuple)
+{
+ struct nf_conntrack_l3proto *l3proto;
+ struct nf_conntrack_l4proto *l4proto;
+ unsigned int protoff;
+ u_int8_t protonum;
+ int ret;
+
+ rcu_read_lock();
+
+ l3proto = __nf_ct_l3proto_find(l3num);
+ ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum);
+ if (ret != NF_ACCEPT) {
+ rcu_read_unlock();
+ return 0;
+ }
+
+ l4proto = __nf_ct_l4proto_find(l3num, protonum);
+
+ ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple,
+ l3proto, l4proto);
+
+ rcu_read_unlock();
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr);
+
int
nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
const struct nf_conntrack_tuple *orig,