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Diffstat (limited to 'net/ipv6/ah6.c')
-rw-r--r--net/ipv6/ah6.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 6c0aa51319a..0f2b4e330aa 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;