[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: NMasahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/flow.h

@@ -67,20 +67,16 @@ struct flowi {
 
 		__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

@@ -509,11 +509,9 @@ __be16 xfrm_flowi_sport(struct flowi *fl)
 	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

@@ -132,6 +132,8 @@ static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *des
 bad:
 	return;
 }
+#else
+static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) {}
 #endif
 
 /**
@@ -189,10 +191,8 @@ static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir)
 	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

@@ -611,9 +611,7 @@ static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
 	struct iovec *iov;
 	u8 __user *type = NULL;
 	u8 __user *code = NULL;
-#ifdef CONFIG_IPV6_MIP6
 	u8 len = 0;
-#endif
 	int probed = 0;
 	int i;
 
@@ -646,7 +644,6 @@ static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
 				probed = 1;
 			}
 			break;
-#ifdef CONFIG_IPV6_MIP6
 		case IPPROTO_MH:
 			if (iov->iov_base && iov->iov_len < 1)
 				break;
@@ -660,7 +657,6 @@ static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
 				len += iov->iov_len;
 
 			break;
-#endif
 		default:
 			probed = 1;
 			break;