[IPV6] IPSEC: Support sending with Mobile IPv6 extension headers.

Mobile IPv6 defines home address option as an option of destination
options header. It is placed before fragment header then
ip6_find_1stfragopt() is fixed to know about it.

Home address option also carries final source address of the flow,
then outbound AH calculation should take care of it like routing
header case.  Based on MIPL2 kernel patch.

Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 5 deletions

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 258e3e45f5e0..c14ea1ecf379 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -475,17 +475,25 @@ int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
                 switch (**nexthdr) {
 
                 case NEXTHDR_HOP:
+                        break;
                 case NEXTHDR_ROUTING:
+                        found_rhdr = 1;
+                        break;
                 case NEXTHDR_DEST:
-                        if (**nexthdr == NEXTHDR_ROUTING) found_rhdr = 1;
-                        if (**nexthdr == NEXTHDR_DEST && found_rhdr) return offset;
-                        offset += ipv6_optlen(exthdr);
-                        *nexthdr = &exthdr->nexthdr;
-                        exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
+#ifdef CONFIG_IPV6_MIP6
+                        if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
+                                break;
+#endif
+                        if (found_rhdr)
+                                return offset;
                         break;
                 default :
                         return offset;
                 }
+
+                offset += ipv6_optlen(exthdr);
+                *nexthdr = &exthdr->nexthdr;
+                exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
         }
 
         return offset;