[IPV6] MIP6: Loadable module support for MIPv6.

[net-next-2.6.git] / net / ipv6 / mip6.c

diff --git a/net/ipv6/mip6.c b/net/ipv6/mip6.c
index bb4033553f3b8c7fd6d5b2639129d1e236d6c278..20c78ecff6a199b55eade55ccc03aec69a2f827a 100644 (file)
--- a/net/ipv6/mip6.c
+++ b/net/ipv6/mip6.c
@@ -30,6 +30,7 @@
 #include <net/sock.h>
 #include <net/ipv6.h>
 #include <net/ip6_checksum.h>
+#include <net/rawv6.h>
 #include <net/xfrm.h>
 #include <net/mip6.h>
 
@@ -86,15 +87,16 @@ static int mip6_mh_len(int type)
        return len;
 }
 
-int mip6_mh_filter(struct sock *sk, struct sk_buff *skb)
+static int mip6_mh_filter(struct sock *sk, struct sk_buff *skb)
 {
        struct ip6_mh *mh;
 
-       if (!pskb_may_pull(skb, (skb->h.raw - skb->data) + 8) ||
-           !pskb_may_pull(skb, (skb->h.raw - skb->data) + ((skb->h.raw[1] + 1) << 3)))
+       if (!pskb_may_pull(skb, (skb_transport_offset(skb)) + 8) ||
+           !pskb_may_pull(skb, (skb_transport_offset(skb) +
+                                ((skb_transport_header(skb)[1] + 1) << 3))))
                return -1;
 
-       mh = (struct ip6_mh *)skb->h.raw;
+       mh = (struct ip6_mh *)skb_transport_header(skb);
 
        if (mh->ip6mh_hdrlen < mip6_mh_len(mh->ip6mh_type)) {
                LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH message too short: %d vs >=%d\n",
@@ -124,12 +126,12 @@ struct mip6_report_rate_limiter {
 };
 
 static struct mip6_report_rate_limiter mip6_report_rl = {
-       .lock = SPIN_LOCK_UNLOCKED
+       .lock = __SPIN_LOCK_UNLOCKED(mip6_report_rl.lock)
 };
 
 static int mip6_destopt_input(struct xfrm_state *x, struct sk_buff *skb)
 {
-       struct ipv6hdr *iph = skb->nh.ipv6h;
+       struct ipv6hdr *iph = ipv6_hdr(skb);
        struct ipv6_destopt_hdr *destopt = (struct ipv6_destopt_hdr *)skb->data;
 
        if (!ipv6_addr_equal(&iph->saddr, (struct in6_addr *)x->coaddr) &&
@@ -157,7 +159,7 @@ static int mip6_destopt_output(struct xfrm_state *x, struct sk_buff *skb)
        nexthdr = *skb_network_header(skb);
        *skb_network_header(skb) = IPPROTO_DSTOPTS;
 
-       dstopt = (struct ipv6_destopt_hdr *)skb->h.raw;
+       dstopt = (struct ipv6_destopt_hdr *)skb_transport_header(skb);
        dstopt->nexthdr = nexthdr;
 
        hao = mip6_padn((char *)(dstopt + 1),
@@ -223,16 +225,16 @@ static int mip6_destopt_reject(struct xfrm_state *x, struct sk_buff *skb, struct
 
        skb_get_timestamp(skb, &stamp);
 
-       if (!mip6_report_rl_allow(&stamp, &skb->nh.ipv6h->daddr,
-                                 hao ? &hao->addr : &skb->nh.ipv6h->saddr,
+       if (!mip6_report_rl_allow(&stamp, &ipv6_hdr(skb)->daddr,
+                                 hao ? &hao->addr : &ipv6_hdr(skb)->saddr,
                                  opt->iif))
                goto out;
 
        memset(&sel, 0, sizeof(sel));
-       memcpy(&sel.daddr, (xfrm_address_t *)&skb->nh.ipv6h->daddr,
+       memcpy(&sel.daddr, (xfrm_address_t *)&ipv6_hdr(skb)->daddr,
               sizeof(sel.daddr));
        sel.prefixlen_d = 128;
-       memcpy(&sel.saddr, (xfrm_address_t *)&skb->nh.ipv6h->saddr,
+       memcpy(&sel.saddr, (xfrm_address_t *)&ipv6_hdr(skb)->saddr,
               sizeof(sel.saddr));
        sel.prefixlen_s = 128;
        sel.family = AF_INET6;
@@ -256,12 +258,13 @@ static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb,
                               u8 **nexthdr)
 {
        u16 offset = sizeof(struct ipv6hdr);
-       struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1);
+       struct ipv6_opt_hdr *exthdr =
+                                  (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
        const unsigned char *nh = skb_network_header(skb);
-       unsigned int packet_len = skb->tail - nh;
+       unsigned int packet_len = skb->tail - skb->network_header;
        int found_rhdr = 0;
 
-       *nexthdr = &skb->nh.ipv6h->nexthdr;
+       *nexthdr = &ipv6_hdr(skb)->nexthdr;
 
        while (offset + 1 <= packet_len) {
 
@@ -368,7 +371,7 @@ static int mip6_rthdr_output(struct xfrm_state *x, struct sk_buff *skb)
        nexthdr = *skb_network_header(skb);
        *skb_network_header(skb) = IPPROTO_ROUTING;
 
-       rt2 = (struct rt2_hdr *)skb->h.raw;
+       rt2 = (struct rt2_hdr *)skb_transport_header(skb);
        rt2->rt_hdr.nexthdr = nexthdr;
        rt2->rt_hdr.hdrlen = (x->props.header_len >> 3) - 1;
        rt2->rt_hdr.type = IPV6_SRCRT_TYPE_2;
@@ -387,12 +390,13 @@ static int mip6_rthdr_offset(struct xfrm_state *x, struct sk_buff *skb,
                             u8 **nexthdr)
 {
        u16 offset = sizeof(struct ipv6hdr);
-       struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1);
+       struct ipv6_opt_hdr *exthdr =
+                                  (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
        const unsigned char *nh = skb_network_header(skb);
-       unsigned int packet_len = skb->tail - nh;
+       unsigned int packet_len = skb->tail - skb->network_header;
        int found_rhdr = 0;
 
-       *nexthdr = &skb->nh.ipv6h->nexthdr;
+       *nexthdr = &ipv6_hdr(skb)->nexthdr;
 
        while (offset + 1 <= packet_len) {
 
@@ -468,7 +472,7 @@ static struct xfrm_type mip6_rthdr_type =
        .remote_addr    = mip6_xfrm_addr,
 };
 
-int __init mip6_init(void)
+static int __init mip6_init(void)
 {
        printk(KERN_INFO "Mobile IPv6\n");
 
@@ -480,18 +484,33 @@ int __init mip6_init(void)
                printk(KERN_INFO "%s: can't add xfrm type(rthdr)\n", __FUNCTION__);
                goto mip6_rthdr_xfrm_fail;
        }
+       if (rawv6_mh_filter_register(mip6_mh_filter) < 0) {
+               printk(KERN_INFO "%s: can't add rawv6 mh filter\n", __FUNCTION__);
+               goto mip6_rawv6_mh_fail;
+       }
+
+
        return 0;
 
+ mip6_rawv6_mh_fail:
+       xfrm_unregister_type(&mip6_rthdr_type, AF_INET6);
  mip6_rthdr_xfrm_fail:
        xfrm_unregister_type(&mip6_destopt_type, AF_INET6);
  mip6_destopt_xfrm_fail:
        return -EAGAIN;
 }
 
-void __exit mip6_fini(void)
+static void __exit mip6_fini(void)
 {
+       if (rawv6_mh_filter_unregister(mip6_mh_filter) < 0)
+               printk(KERN_INFO "%s: can't remove rawv6 mh filter\n", __FUNCTION__);
        if (xfrm_unregister_type(&mip6_rthdr_type, AF_INET6) < 0)
                printk(KERN_INFO "%s: can't remove xfrm type(rthdr)\n", __FUNCTION__);
        if (xfrm_unregister_type(&mip6_destopt_type, AF_INET6) < 0)
                printk(KERN_INFO "%s: can't remove xfrm type(destopt)\n", __FUNCTION__);
 }
+
+module_init(mip6_init);
+module_exit(mip6_fini);
+
+MODULE_LICENSE("GPL");