RT6: Replace 'struct in6_addr' members type with a 'nd_ipv6' one

In 'struct ip6_hdr', 'struct ip6_rthdr0' and 'struct ip6_srh'.
This avoid some 'undefined-behavior' warnings with clang and option
-fsanitize=undefined enabled.

print-rt6.c:66:3: runtime error: member access within misaligned address
0x61d00001eab6 for type 'const struct ip6_rthdr0', which requires 4 byte
alignment
0x61d00001eab6: note: pointer points here
 00 00 00 04 3a 02  00 01 00 00 00 00 22 00  00 00 00 00 02 10 00 02  00 00 00 00 00 04 80 00  d3 ab
             ^
SUMMARY: AddressSanitizer: undefined-behavior print-rt6.c:66:3 in

1 files changed, 4 insertions, 4 deletions

diff --git a/ip6.h b/ip6.h
index 612f30cf..a821cd23 100644
--- a/ip6.h
+++ b/ip6.h
@@ -83,8 +83,8 @@ struct ip6_hdr {
 		} ip6_un1;
 		nd_uint8_t ip6_un2_vfc;	/* 4 bits version, top 4 bits class */
 	} ip6_ctlun;
-	struct in6_addr ip6_src;	/* source address */
-	struct in6_addr ip6_dst;	/* destination address */
+	nd_ipv6 ip6_src;	/* source address */
+	nd_ipv6 ip6_dst;	/* destination address */
 } ND_UNALIGNED;
 
 #define ip6_vfc		ip6_ctlun.ip6_un2_vfc
@@ -184,7 +184,7 @@ struct ip6_rthdr0 {
 	nd_uint8_t  ip6r0_type;		/* always zero */
 	nd_uint8_t  ip6r0_segleft;	/* segments left */
 	nd_uint32_t ip6r0_reserved;	/* reserved field */
-	struct in6_addr ip6r0_addr[1];	/* up to 23 addresses */
+	nd_ipv6     ip6r0_addr[1];	/* up to 23 addresses */
 };
 
 /**
@@ -199,7 +199,7 @@ struct ip6_srh {
 	nd_uint8_t	srh_last_ent;		/* Last Entry*/
 	nd_uint8_t	srh_flags;		/* Flags */
 	nd_uint16_t	srh_tag;		/* Tag */
-	struct in6_addr	srh_segments[1];	/* SRH segments list*/
+	nd_ipv6		srh_segments[1];	/* SRH segments list*/
 };
 
 /* Fragment header */