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[NETFILTER]: nf_conntrack: make l3proto->prepare() generic and renames it

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The icmp[v6] l4proto modules parse headers in ICMP[v6] error to get tuple.
But they have to find the offset to transport protocol header before that.
Their processings are almost same as prepare() of l3proto modules.
This makes prepare() more generic to simplify icmp[v6] l4proto module
later.

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>
This commit is contained in:
Yasuyuki Kozakai 2007-07-14 20:44:50 -07:00 committed by David S. Miller
parent d87d8469e2
commit ffc3069048
6 changed files with 40 additions and 30 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
include/net/netfilter/ipv6/nf_conntrack_ipv6.h
View file

@ -7,7 +7,7 @@ extern struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6;
extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6;
extern struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6;
extern int nf_ct_ipv6_skip_exthdr(struct sk_buff *skb, int start,
extern int nf_ct_ipv6_skip_exthdr(const struct sk_buff *skb, int start,
u8 *nexthdrp, int len);
extern int nf_ct_frag6_init(void);

6
include/net/netfilter/nf_conntrack_l3proto.h
View file

@ -58,11 +58,11 @@ struct nf_conntrack_l3proto
/*
* Called before tracking.
* *dataoff: offset of protocol header (TCP, UDP,...) in *pskb
* *dataoff: offset of protocol header (TCP, UDP,...) in skb
* *protonum: protocol number
*/
int (*prepare)(struct sk_buff **pskb, unsigned int hooknum,
unsigned int *dataoff, u_int8_t *protonum);
int (*get_l4proto)(const struct sk_buff *skb, unsigned int nhoff,
unsigned int *dataoff, u_int8_t *protonum);
int (*tuple_to_nfattr)(struct sk_buff *skb,
const struct nf_conntrack_tuple *t);

23
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
View file

@ -78,21 +78,26 @@ nf_ct_ipv4_gather_frags(struct sk_buff *skb, u_int32_t user)
return skb;
}
static int
ipv4_prepare(struct sk_buff **pskb, unsigned int hooknum, unsigned int *dataoff,
u_int8_t *protonum)
static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
unsigned int *dataoff, u_int8_t *protonum)
{
struct iphdr _iph, *iph;
iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph);
if (iph == NULL)
return -NF_DROP;
/* Never happen */
if (ip_hdr(*pskb)->frag_off & htons(IP_OFFSET)) {
if (iph->frag_off & htons(IP_OFFSET)) {
if (net_ratelimit()) {
printk(KERN_ERR "ipv4_prepare: Frag of proto %u (hook=%u)\n",
ip_hdr(*pskb)->protocol, hooknum);
printk(KERN_ERR "ipv4_get_l4proto: Frag of proto %u\n",
iph->protocol);
}
return -NF_DROP;
}
*dataoff = skb_network_offset(*pskb) + ip_hdrlen(*pskb);
*protonum = ip_hdr(*pskb)->protocol;
*dataoff = nhoff + (iph->ihl << 2);
*protonum = iph->protocol;
return NF_ACCEPT;
}
@ -407,7 +412,7 @@ struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 = {
.invert_tuple = ipv4_invert_tuple,
.print_tuple = ipv4_print_tuple,
.print_conntrack = ipv4_print_conntrack,
.prepare = ipv4_prepare,
.get_l4proto = ipv4_get_l4proto,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.tuple_to_nfattr = ipv4_tuple_to_nfattr,
.nfattr_to_tuple = ipv4_nfattr_to_tuple,

27
net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
View file

@ -86,7 +86,7 @@ static int ipv6_print_conntrack(struct seq_file *s,
* - Note also special handling of AUTH header. Thanks to IPsec wizards.
*/
int nf_ct_ipv6_skip_exthdr(struct sk_buff *skb, int start, u8 *nexthdrp,
int nf_ct_ipv6_skip_exthdr(const struct sk_buff *skb, int start, u8 *nexthdrp,
int len)
{
u8 nexthdr = *nexthdrp;
@ -117,19 +117,24 @@ int nf_ct_ipv6_skip_exthdr(struct sk_buff *skb, int start, u8 *nexthdrp,
return start;
}
static int
ipv6_prepare(struct sk_buff **pskb, unsigned int hooknum, unsigned int *dataoff,
u_int8_t *protonum)
static int ipv6_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
unsigned int *dataoff, u_int8_t *protonum)
{
unsigned int extoff = (u8 *)(ipv6_hdr(*pskb) + 1) - (*pskb)->data;
unsigned char pnum = ipv6_hdr(*pskb)->nexthdr;
int protoff = nf_ct_ipv6_skip_exthdr(*pskb, extoff, &pnum,
(*pskb)->len - extoff);
unsigned int extoff = nhoff + sizeof(struct ipv6hdr);
unsigned char pnum;
int protoff;
if (skb_copy_bits(skb, nhoff + offsetof(struct ipv6hdr, nexthdr),
&pnum, sizeof(pnum)) != 0) {
pr_debug("ip6_conntrack_core: can't get nexthdr\n");
return -NF_ACCEPT;
}
protoff = nf_ct_ipv6_skip_exthdr(skb, extoff, &pnum, skb->len - extoff);
/*
* (protoff == (*pskb)->len) mean that the packet doesn't have no data
* (protoff == skb->len) mean that the packet doesn't have no data
* except of IPv6 & ext headers. but it's tracked anyway. - YK
*/
if ((protoff < 0) || (protoff > (*pskb)->len)) {
if ((protoff < 0) || (protoff > skb->len)) {
pr_debug("ip6_conntrack_core: can't find proto in pkt\n");
return -NF_ACCEPT;
}
@ -375,7 +380,7 @@ struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6 = {
.invert_tuple = ipv6_invert_tuple,
.print_tuple = ipv6_print_tuple,
.print_conntrack = ipv6_print_conntrack,
.prepare = ipv6_prepare,
.get_l4proto = ipv6_get_l4proto,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.tuple_to_nfattr = ipv6_tuple_to_nfattr,
.nfattr_to_tuple = ipv6_nfattr_to_tuple,

5
net/netfilter/nf_conntrack_core.c
View file

@ -622,8 +622,9 @@ nf_conntrack_in(int pf, unsigned int hooknum, struct sk_buff **pskb)
/* rcu_read_lock()ed by nf_hook_slow */
l3proto = __nf_ct_l3proto_find((u_int16_t)pf);
if ((ret = l3proto->prepare(pskb, hooknum, &dataoff, &protonum)) <= 0) {
ret = l3proto->get_l4proto(*pskb, skb_network_offset(*pskb),
&dataoff, &protonum);
if (ret <= 0) {
pr_debug("not prepared to track yet or error occured\n");
NF_CT_STAT_INC_ATOMIC(error);
NF_CT_STAT_INC_ATOMIC(invalid);

7
net/netfilter/nf_conntrack_l3proto_generic.c
View file

@ -61,9 +61,8 @@ static int generic_print_conntrack(struct seq_file *s,
return 0;
}
static int
generic_prepare(struct sk_buff **pskb, unsigned int hooknum,
unsigned int *dataoff, u_int8_t *protonum)
static int generic_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
unsigned int *dataoff, u_int8_t *protonum)
{
/* Never track !!! */
return -NF_ACCEPT;
@ -77,6 +76,6 @@ struct nf_conntrack_l3proto nf_conntrack_l3proto_generic = {
.invert_tuple = generic_invert_tuple,
.print_tuple = generic_print_tuple,
.print_conntrack = generic_print_conntrack,
.prepare = generic_prepare,
.get_l4proto = generic_get_l4proto,
};
EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_generic);