/* IPv4 specific functions of netfilter core */
-
-#include <linux/config.h>
-#ifdef CONFIG_NETFILTER
-
#include <linux/kernel.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
-
-#include <linux/tcp.h>
-#include <linux/udp.h>
-#include <linux/icmp.h>
-#include <net/route.h>
#include <linux/ip.h>
+#include <net/route.h>
+#include <net/xfrm.h>
+#include <net/ip.h>
/* route_me_harder function, used by iptable_nat, iptable_mangle + ip_queue */
int ip_route_me_harder(struct sk_buff **pskb)
#ifdef CONFIG_IP_ROUTE_FWMARK
fl.nl_u.ip4_u.fwmark = (*pskb)->nfmark;
#endif
- fl.proto = iph->protocol;
if (ip_route_output_key(&rt, &fl) != 0)
return -1;
if ((*pskb)->dst->error)
return -1;
+#ifdef CONFIG_XFRM
+ if (!(IPCB(*pskb)->flags & IPSKB_XFRM_TRANSFORMED) &&
+ xfrm_decode_session(*pskb, &fl, AF_INET) == 0)
+ if (xfrm_lookup(&(*pskb)->dst, &fl, (*pskb)->sk, 0))
+ return -1;
+#endif
+
/* Change in oif may mean change in hh_len. */
hh_len = (*pskb)->dst->dev->hard_header_len;
if (skb_headroom(*pskb) < hh_len) {
}
EXPORT_SYMBOL(ip_route_me_harder);
+#ifdef CONFIG_XFRM
+int ip_xfrm_me_harder(struct sk_buff **pskb)
+{
+ struct flowi fl;
+ unsigned int hh_len;
+ struct dst_entry *dst;
+
+ if (IPCB(*pskb)->flags & IPSKB_XFRM_TRANSFORMED)
+ return 0;
+ if (xfrm_decode_session(*pskb, &fl, AF_INET) < 0)
+ return -1;
+
+ dst = (*pskb)->dst;
+ if (dst->xfrm)
+ dst = ((struct xfrm_dst *)dst)->route;
+ dst_hold(dst);
+
+ if (xfrm_lookup(&dst, &fl, (*pskb)->sk, 0) < 0)
+ return -1;
+
+ dst_release((*pskb)->dst);
+ (*pskb)->dst = dst;
+
+ /* Change in oif may mean change in hh_len. */
+ hh_len = (*pskb)->dst->dev->hard_header_len;
+ if (skb_headroom(*pskb) < hh_len) {
+ struct sk_buff *nskb;
+
+ nskb = skb_realloc_headroom(*pskb, hh_len);
+ if (!nskb)
+ return -1;
+ if ((*pskb)->sk)
+ skb_set_owner_w(nskb, (*pskb)->sk);
+ kfree_skb(*pskb);
+ *pskb = nskb;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(ip_xfrm_me_harder);
+#endif
+
+void (*ip_nat_decode_session)(struct sk_buff *, struct flowi *);
+EXPORT_SYMBOL(ip_nat_decode_session);
+
/*
* Extra routing may needed on local out, as the QUEUE target never
* returns control to the table.
u_int8_t tos;
};
-static void queue_save(const struct sk_buff *skb, struct nf_info *info)
+static void nf_ip_saveroute(const struct sk_buff *skb, struct nf_info *info)
{
struct ip_rt_info *rt_info = nf_info_reroute(info);
}
}
-static int queue_reroute(struct sk_buff **pskb, const struct nf_info *info)
+static int nf_ip_reroute(struct sk_buff **pskb, const struct nf_info *info)
{
const struct ip_rt_info *rt_info = nf_info_reroute(info);
return 0;
}
-static struct nf_queue_rerouter ip_reroute = {
- .rer_size = sizeof(struct ip_rt_info),
- .save = queue_save,
- .reroute = queue_reroute,
+unsigned int nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
+ unsigned int dataoff, u_int8_t protocol)
+{
+ struct iphdr *iph = skb->nh.iph;
+ unsigned int csum = 0;
+
+ switch (skb->ip_summed) {
+ case CHECKSUM_HW:
+ if (hook != NF_IP_PRE_ROUTING && hook != NF_IP_LOCAL_IN)
+ break;
+ if ((protocol == 0 && !(u16)csum_fold(skb->csum)) ||
+ !csum_tcpudp_magic(iph->saddr, iph->daddr,
+ skb->len - dataoff, protocol,
+ skb->csum)) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ break;
+ }
+ /* fall through */
+ case CHECKSUM_NONE:
+ if (protocol == 0)
+ skb->csum = 0;
+ else
+ skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
+ skb->len - dataoff,
+ protocol, 0);
+ csum = __skb_checksum_complete(skb);
+ }
+ return csum;
+}
+
+EXPORT_SYMBOL(nf_ip_checksum);
+
+static struct nf_afinfo nf_ip_afinfo = {
+ .family = AF_INET,
+ .checksum = nf_ip_checksum,
+ .saveroute = nf_ip_saveroute,
+ .reroute = nf_ip_reroute,
+ .route_key_size = sizeof(struct ip_rt_info),
};
-static int init(void)
+static int ipv4_netfilter_init(void)
{
- return nf_register_queue_rerouter(PF_INET, &ip_reroute);
+ return nf_register_afinfo(&nf_ip_afinfo);
}
-static void fini(void)
+static void ipv4_netfilter_fini(void)
{
- nf_unregister_queue_rerouter(PF_INET);
+ nf_unregister_afinfo(&nf_ip_afinfo);
}
-module_init(init);
-module_exit(fini);
-
-#endif /* CONFIG_NETFILTER */
+module_init(ipv4_netfilter_init);
+module_exit(ipv4_netfilter_fini);