[SK_BUFF]: Introduce ip_hdr(), remove skb->nh.iph

[linux-2.6-block.git] / net / ipv4 / netfilter / iptable_mangle.c

diff --git a/net/ipv4/netfilter/iptable_mangle.c b/net/ipv4/netfilter/iptable_mangle.c
index e62ea2bb9c0ac422f7c77e39aa7f99eba5fa6e3b..26e60fbe7ee0ab9205010e6ab9101a213469d480 100644 (file)
--- a/net/ipv4/netfilter/iptable_mangle.c
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -17,6 +17,7 @@
 #include <net/sock.h>
 #include <net/route.h>
 #include <linux/ip.h>
+#include <net/ip.h>
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
@@ -58,7 +59,7 @@ static struct
              { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
                -NF_ACCEPT - 1 } },
            /* LOCAL_IN */
-           { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+           { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
                0,
                sizeof(struct ipt_entry),
                sizeof(struct ipt_standard),
@@ -66,7 +67,7 @@ static struct
              { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
                -NF_ACCEPT - 1 } },
            /* FORWARD */
-           { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+           { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
                0,
                sizeof(struct ipt_entry),
                sizeof(struct ipt_standard),
@@ -103,7 +104,7 @@ static struct
     }
 };
 
-static struct ipt_table packet_mangler = {
+static struct xt_table packet_mangler = {
        .name           = "mangle",
        .valid_hooks    = MANGLE_VALID_HOOKS,
        .lock           = RW_LOCK_UNLOCKED,
@@ -130,34 +131,38 @@ ipt_local_hook(unsigned int hook,
                   int (*okfn)(struct sk_buff *))
 {
        unsigned int ret;
+       const struct iphdr *iph;
        u_int8_t tos;
        __be32 saddr, daddr;
-       unsigned long nfmark;
+       u_int32_t mark;
 
        /* root is playing with raw sockets. */
        if ((*pskb)->len < sizeof(struct iphdr)
-           || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
+           || ip_hdrlen(*pskb) < sizeof(struct iphdr)) {
                if (net_ratelimit())
                        printk("ipt_hook: happy cracking.\n");
                return NF_ACCEPT;
        }
 
        /* Save things which could affect route */
-       nfmark = (*pskb)->nfmark;
-       saddr = (*pskb)->nh.iph->saddr;
-       daddr = (*pskb)->nh.iph->daddr;
-       tos = (*pskb)->nh.iph->tos;
+       mark = (*pskb)->mark;
+       iph = ip_hdr(*pskb);
+       saddr = iph->saddr;
+       daddr = iph->daddr;
+       tos = iph->tos;
 
        ret = ipt_do_table(pskb, hook, in, out, &packet_mangler);
        /* Reroute for ANY change. */
-       if (ret != NF_DROP && ret != NF_STOLEN && ret != NF_QUEUE
-           && ((*pskb)->nh.iph->saddr != saddr
-               || (*pskb)->nh.iph->daddr != daddr
-#ifdef CONFIG_IP_ROUTE_FWMARK
-               || (*pskb)->nfmark != nfmark
-#endif
-               || (*pskb)->nh.iph->tos != tos))
-               return ip_route_me_harder(pskb) == 0 ? ret : NF_DROP;
+       if (ret != NF_DROP && ret != NF_STOLEN && ret != NF_QUEUE) {
+               iph = ip_hdr(*pskb);
+
+               if (iph->saddr != saddr ||
+                   iph->daddr != daddr ||
+                   (*pskb)->mark != mark ||
+                   iph->tos != tos)
+                       if (ip_route_me_harder(pskb, RTN_UNSPEC))
+                               ret = NF_DROP;
+       }
 
        return ret;
 }
@@ -167,7 +172,7 @@ static struct nf_hook_ops ipt_ops[] = {
                .hook           = ipt_route_hook,
                .owner          = THIS_MODULE,
                .pf             = PF_INET,
-               .hooknum        = NF_IP_PRE_ROUTING, 
+               .hooknum        = NF_IP_PRE_ROUTING,
                .priority       = NF_IP_PRI_MANGLE,
        },
        {