[IPV6] MIP6: Kill unnecessary ifdefs.

Kill unnecessary CONFIG_IPV6_MIP6.

o It is redundant for RAW socket to keep MH out with the config then
it can handle any protocol.
o Clean-up at AH.

Signed-off-by: Masahide NAKAMURA <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/flow.h

···
 
 		__be32		spi;
 
-#ifdef CONFIG_IPV6_MIP6
 		struct {
 			__u8	type;
 		} mht;
-#endif
 	} uli_u;
 #define fl_ip_sport	uli_u.ports.sport
 #define fl_ip_dport	uli_u.ports.dport
 #define fl_icmp_type	uli_u.icmpt.type
 #define fl_icmp_code	uli_u.icmpt.code
 #define fl_ipsec_spi	uli_u.spi
-#ifdef CONFIG_IPV6_MIP6
 #define fl_mh_type	uli_u.mht.type
-#endif
 	__u32           secid;	/* used by xfrm; see secid.txt */
 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 

include/net/xfrm.h

···
 	case IPPROTO_ICMPV6:
 		port = htons(fl->fl_icmp_type);
 		break;
-#ifdef CONFIG_IPV6_MIP6
 	case IPPROTO_MH:
 		port = htons(fl->fl_mh_type);
 		break;
-#endif
 	default:
 		port = 0;	/*XXX*/
 	}

net/ipv6/ah6.c

···
 bad:
 	return;
 }
+#else
+static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) {}
 #endif
 
 /**
···
 	while (exthdr.raw < end) {
 		switch (nexthdr) {
 		case NEXTHDR_DEST:
-#ifdef CONFIG_IPV6_MIP6
 			if (dir == XFRM_POLICY_OUT)
 				ipv6_rearrange_destopt(iph, exthdr.opth);
-#endif
 		case NEXTHDR_HOP:
 			if (!zero_out_mutable_opts(exthdr.opth)) {
 				LIMIT_NETDEBUG(

net/ipv6/raw.c

···
 	struct iovec *iov;
 	u8 __user *type = NULL;
 	u8 __user *code = NULL;
-#ifdef CONFIG_IPV6_MIP6
 	u8 len = 0;
-#endif
 	int probed = 0;
 	int i;
 
···
 				probed = 1;
 			}
 			break;
-#ifdef CONFIG_IPV6_MIP6
 		case IPPROTO_MH:
 			if (iov->iov_base && iov->iov_len < 1)
 				break;
···
 				len += iov->iov_len;
 
 			break;
-#endif
 		default:
 			probed = 1;
 			break;