From 65d120ca27ec1de55c09609036d1e1b53cd8b49c Mon Sep 17 00:00:00 2001
From: Anas Nashif <anas.nashif@intel.com>
Date: Tue, 6 Nov 2012 16:29:33 -0800
Subject: [PATCH] aliasing

---
 icmp6.h       |  4 ++++
 print-icmp.c  | 18 +++++++++++-------
 print-icmp6.c |  2 +-
 print-timed.c |  4 ++--
 timed.h       | 11 ++++++++++-
 5 files changed, 28 insertions(+), 11 deletions(-)

diff --git a/icmp6.h b/icmp6.h
index 168a708..ce185d0 100644
--- a/icmp6.h
+++ b/icmp6.h
@@ -404,7 +404,11 @@ struct icmp6_router_renum {	/* router renumbering header */
 	u_int8_t	rr_segnum;
 	u_int8_t	rr_flags;
 	u_int16_t	rr_maxdelay;
+	union {
+		u_int8_t	rr_reserved8[4];
+		u_int16_t	rr_reserved16[2];
 	u_int32_t	rr_reserved;
+	};
 };
 #define ICMP6_RR_FLAGS_TEST		0x80
 #define ICMP6_RR_FLAGS_REQRESULT	0x40
diff --git a/print-icmp.c b/print-icmp.c
index 03b9505..2b3d422 100644
--- a/print-icmp.c
+++ b/print-icmp.c
@@ -47,6 +47,12 @@ static const char rcsid[] _U_ =
  * Per RFC 792, September 1981.
  */
 
+/* rfc1191 */
+struct mtu_discovery {
+	u_int16_t unused;
+	u_int16_t nexthopmtu;
+};
+
 /*
  * Structure of an icmp header.
  */
@@ -61,8 +67,12 @@ struct icmp {
 			u_int16_t icd_id;
 			u_int16_t icd_seq;
 		} ih_idseq;
+		union {
 		u_int32_t ih_void;
+			struct mtu_discovery ih_mtu_discovery;
+		};
 	} icmp_hun;
+#define icmp_mtu_discovery icmp_hun.ih_mtu_discovery
 #define	icmp_pptr	icmp_hun.ih_pptr
 #define	icmp_gwaddr	icmp_hun.ih_gwaddr
 #define	icmp_id		icmp_hun.ih_idseq.icd_id
@@ -243,12 +253,6 @@ static struct tok type2str[] = {
 	{ 0,				NULL }
 };
 
-/* rfc1191 */
-struct mtu_discovery {
-	u_int16_t unused;
-	u_int16_t nexthopmtu;
-};
-
 /* rfc1256 */
 struct ih_rdiscovery {
 	u_int8_t ird_addrnum;
@@ -413,7 +417,7 @@ icmp_print(const u_char *bp, u_int plen, const u_char *bp2, int fragmented)
 		case ICMP_UNREACH_NEEDFRAG:
 		    {
 			register const struct mtu_discovery *mp;
-			mp = (struct mtu_discovery *)(u_char *)&dp->icmp_void;
+			mp = &dp->icmp_mtu_discovery;
 			mtu = EXTRACT_16BITS(&mp->nexthopmtu);
 			if (mtu) {
 				(void)snprintf(buf, sizeof(buf),
diff --git a/print-icmp6.c b/print-icmp6.c
index 176c15c..d8e5d43 100644
--- a/print-icmp6.c
+++ b/print-icmp6.c
@@ -1279,7 +1279,7 @@ icmp6_rrenum_print(const u_char *bp, const u_char *ep)
 		printf("seg=%u,", rr6->rr_segnum);
 		printf("maxdelay=%u", EXTRACT_16BITS(&rr6->rr_maxdelay));
 		if (rr6->rr_reserved)
-			printf("rsvd=0x%x", EXTRACT_32BITS(&rr6->rr_reserved));
+			printf("rsvd=0x%x", EXTRACT_16BITS(&rr6->rr_reserved16[0]));
 		/*[*/
 		printf("]");
 #undef F
diff --git a/print-timed.c b/print-timed.c
index 55fbb39..176e181 100644
--- a/print-timed.c
+++ b/print-timed.c
@@ -86,8 +86,8 @@ timed_print(register const u_char *bp)
 			fputs(" [|timed]", stdout);
 			return;
 		}
-		sec = EXTRACT_32BITS(&tsp->tsp_time.tv_sec);
-		usec = EXTRACT_32BITS(&tsp->tsp_time.tv_usec);
+		sec = EXTRACT_32BITS(&tsp->tsp_time.tv_sec32[0]);
+		usec = EXTRACT_32BITS(&tsp->tsp_time.tv_usec32[0]);
 		if (usec < 0)
 			/* corrupt, skip the rest of the packet */
 			return;
diff --git a/timed.h b/timed.h
index f8d5a11..2345dfc 100644
--- a/timed.h
+++ b/timed.h
@@ -54,7 +54,16 @@ struct tsp {
 	u_int8_t	tsp_vers;
 	u_int16_t	tsp_seq;
 	union {
-		struct tsp_timeval tspu_time;
+		struct {
+			union {
+				int	tv_sec32[2];
+				long	tv_sec;
+			};
+			union {
+				int	tv_usec32[2];
+				long	tv_usec;
+				};
+		} tspu_time;
 		int8_t tspu_hopcnt;
 	} tsp_u;
 	int8_t tsp_name[256];
-- 
2.7.4