[PATCH 13/28] batctl: tcpdump: fix reported length for ICMP6_TIME_EXCEEDED

The remaining buffer size for ICMP6_TIME_EXCEEDED is only the buffer length
minus the IPv6 header. It could now be discussed whether the output length
should now be with or without the icmp6_hdr length. The length with
icmp6_hdr was chosen because the code looks like a simple copy and paste
error and ip6_hdr's length was most likely the actual intent for the
calculation.

Fixes: 35b37756f4a3 ("add IPv6 support to tcpdump parser")
Signed-off-by: Sven Eckelmann <[email protected]>
---
 tcpdump.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tcpdump.c b/tcpdump.c
index 0895c61..9c90f36 100644
--- a/tcpdump.c
+++ b/tcpdump.c
@@ -669,7 +669,7 @@ static void dump_ipv6(unsigned char *packet_buff, ssize_t buff_len,
 			break;
 		case ICMP6_TIME_EXCEEDED:
 			printf(" time exceeded in-transit, length %zu\n",
-			       (size_t)buff_len - sizeof(struct icmp6_hdr));
+			       (size_t)buff_len - sizeof(struct ip6_hdr));
 			break;
 		case ND_NEIGHBOR_SOLICIT:
 			LEN_CHECK((size_t)buff_len - (size_t)(sizeof(struct ip6_hdr)),

-- 
2.47.3