1 files changed, 109 insertions, 0 deletions

diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 6c0aa51319a5..0f2b4e330aa9 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -74,6 +74,68 @@ bad:
         return 0;
 }
 
+#ifdef CONFIG_IPV6_MIP6
+/**
+ *      ipv6_rearrange_destopt - rearrange IPv6 destination options header
+ *      @iph: IPv6 header
+ *      @destopt: destionation options header
+ */
+static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt)
+{
+        u8 *opt = (u8 *)destopt;
+        int len = ipv6_optlen(destopt);
+        int off = 0;
+        int optlen = 0;
+
+        off += 2;
+        len -= 2;
+
+        while (len > 0) {
+
+                switch (opt[off]) {
+
+                case IPV6_TLV_PAD0:
+                        optlen = 1;
+                        break;
+                default:
+                        if (len < 2)
+                                goto bad;
+                        optlen = opt[off+1]+2;
+                        if (len < optlen)
+                                goto bad;
+
+                        /* Rearrange the source address in @iph and the
+                         * addresses in home address option for final source.
+                         * See 11.3.2 of RFC 3775 for details.
+                         */
+                        if (opt[off] == IPV6_TLV_HAO) {
+                                struct in6_addr final_addr;
+                                struct ipv6_destopt_hao *hao;
+
+                                hao = (struct ipv6_destopt_hao *)&opt[off];
+                                if (hao->length != sizeof(hao->addr)) {
+                                        if (net_ratelimit())
+                                                printk(KERN_WARNING "destopt hao: invalid header length: %u\n", hao->length);
+                                        goto bad;
+                                }
+                                ipv6_addr_copy(&final_addr, &hao->addr);
+                                ipv6_addr_copy(&hao->addr, &iph->saddr);
+                                ipv6_addr_copy(&iph->saddr, &final_addr);
+                        }
+                        break;
+                }
+
+                off += optlen;
+                len -= optlen;
+        }
+        if (len == 0)
+                return;
+
+bad:
+        return;
+}
+#endif
+
 /**
  *      ipv6_rearrange_rthdr - rearrange IPv6 routing header
  *      @iph: IPv6 header
@@ -113,7 +175,11 @@ static void ipv6_rearrange_rthdr(struct ipv6hdr *iph, struct ipv6_rt_hdr *rthdr)
         ipv6_addr_copy(&iph->daddr, &final_addr);
 }
 
+#ifdef CONFIG_IPV6_MIP6
+static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir)
+#else
 static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len)
+#endif
 {
         union {
                 struct ipv6hdr *iph;
@@ -128,6 +194,28 @@ static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len)
 
         while (exthdr.raw < end) {
                 switch (nexthdr) {
+#ifdef CONFIG_IPV6_MIP6
+                case NEXTHDR_HOP:
+                        if (!zero_out_mutable_opts(exthdr.opth)) {
+                                LIMIT_NETDEBUG(
+                                        KERN_WARNING "overrun %sopts\n",
+                                        nexthdr == NEXTHDR_HOP ?
+                                                "hop" : "dest");
+                                return -EINVAL;
+                        }
+                        break;
+                case NEXTHDR_DEST:
+                        if (dir == XFRM_POLICY_OUT)
+                                ipv6_rearrange_destopt(iph, exthdr.opth);
+                        if (!zero_out_mutable_opts(exthdr.opth)) {
+                                LIMIT_NETDEBUG(
+                                        KERN_WARNING "overrun %sopts\n",
+                                        nexthdr == NEXTHDR_HOP ?
+                                                "hop" : "dest");
+                                return -EINVAL;
+                        }
+                        break;
+#else
                 case NEXTHDR_HOP:
                 case NEXTHDR_DEST:
                         if (!zero_out_mutable_opts(exthdr.opth)) {
@@ -138,6 +226,7 @@ static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len)
                                 return -EINVAL;
                         }
                         break;
+#endif
 
                 case NEXTHDR_ROUTING:
                         ipv6_rearrange_rthdr(iph, exthdr.rth);
@@ -164,6 +253,9 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
         u8 nexthdr;
         char tmp_base[8];
         struct {
+#ifdef CONFIG_IPV6_MIP6
+                struct in6_addr saddr;
+#endif
                 struct in6_addr daddr;
                 char hdrs[0];
         } *tmp_ext;
@@ -188,10 +280,18 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
                         err = -ENOMEM;
                         goto error;
                 }
+#ifdef CONFIG_IPV6_MIP6
+                memcpy(tmp_ext, &top_iph->saddr, extlen);
+                err = ipv6_clear_mutable_options(top_iph,
+                                                 extlen - sizeof(*tmp_ext) +
+                                                 sizeof(*top_iph),
+                                                 XFRM_POLICY_OUT);
+#else
                 memcpy(tmp_ext, &top_iph->daddr, extlen);
                 err = ipv6_clear_mutable_options(top_iph,
                                                  extlen - sizeof(*tmp_ext) +
                                                  sizeof(*top_iph));
+#endif
                 if (err)
                         goto error_free_iph;
         }
@@ -222,7 +322,11 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
 
         memcpy(top_iph, tmp_base, sizeof(tmp_base));
         if (tmp_ext) {
+#ifdef CONFIG_IPV6_MIP6
+                memcpy(&top_iph->saddr, tmp_ext, extlen);
+#else
                 memcpy(&top_iph->daddr, tmp_ext, extlen);
+#endif
 error_free_iph:
                 kfree(tmp_ext);
         }
@@ -282,8 +386,13 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
         if (!tmp_hdr)
                 goto out;
         memcpy(tmp_hdr, skb->nh.raw, hdr_len);
+#ifdef CONFIG_IPV6_MIP6
+        if (ipv6_clear_mutable_options(skb->nh.ipv6h, hdr_len, XFRM_POLICY_IN))
+                goto free_out;
+#else
         if (ipv6_clear_mutable_options(skb->nh.ipv6h, hdr_len))
                 goto free_out;
+#endif
         skb->nh.ipv6h->priority    = 0;
         skb->nh.ipv6h->flow_lbl[0] = 0;
         skb->nh.ipv6h->flow_lbl[1] = 0;