Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc-merge

[linux-2.6-omap-h63xx.git] / net / ipv4 / netfilter.c

diff --git a/net/ipv4/netfilter.c b/net/ipv4/netfilter.c
index ae0779d82c5d2191744da417b277fdd3c8fbbda6..6a9e34b794bc7d3c495566045ef2c38bad3a0c5d 100644 (file)
--- a/net/ipv4/netfilter.c
+++ b/net/ipv4/netfilter.c
@@ -1,17 +1,11 @@
 /* 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)
@@ -33,7 +27,6 @@ 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;
 
@@ -60,6 +53,13 @@ int ip_route_me_harder(struct sk_buff **pskb)
        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) {
@@ -78,6 +78,50 @@ int ip_route_me_harder(struct sk_buff **pskb)
 }
 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.
@@ -89,7 +133,7 @@ struct ip_rt_info {
        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);
 
@@ -102,7 +146,7 @@ static void queue_save(const struct sk_buff *skb, struct nf_info *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);
 
@@ -117,23 +161,55 @@ static int queue_reroute(struct sk_buff **pskb, const struct nf_info *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);