It looks like tcprewrite can't handle ICMPV6 packets and packets with ip
options.
I've attached a patch.
Aaron Turner wrote:
Thanks to some feedback with pre2, I've fixed a compile-time issue.
No other real changes.
http://tcpreplay.synfin.net/tcpreplay-3.4.2pre3.tar.gz
--- tcpreplay-3.4.1.org/src/tcpedit/checksum.c 2009-01-18 19:47:38.000000000
+0200
+++ tcpreplay-3.4.1.new/src/tcpedit/checksum.c 2009-05-17 12:51:31.000000000
+0300
@@ -52,6 +52,7 @@
tcp_hdr_t *tcp;
udp_hdr_t *udp;
icmpv4_hdr_t *icmp;
+ icmpv6_hdr_t *icmp6;
int ip_hl;
int sum;
@@ -69,7 +70,14 @@
if (ipv4->ip_v == 6) {
ipv6 = (ipv6_hdr_t *)data;
ipv4 = NULL;
- ip_hl = 40;
+
+ proto = get_ipv6_l4proto(ipv6);
+ dbgx(3, "layer4 proto is 0x%hhu", proto);
+
+ ip_hl = (u_char*)get_layer4_v6(ipv6) - (u_char*)data;
+ dbgx(3, "ip_hl proto is 0x%d", ip_hl);
+
+ len -= (ip_hl - TCPR_IPV6_H);
} else {
ip_hl = ipv4->ip_hl << 2;
}
@@ -121,6 +129,17 @@
icmp->icmp_sum = CHECKSUM_CARRY(sum);
break;
+ case IPPROTO_ICMP6:
+ icmp6 = (icmpv6_hdr_t *)(data + ip_hl);
+ icmp6->icmp_sum = 0;
+ if (ipv6 != NULL) {
+ sum = do_checksum_math((u_int16_t *)&ipv6->ip_src, 32);
+ }
+ sum += ntohs(IPPROTO_ICMP6 + len);
+ sum += do_checksum_math((u_int16_t *)icmp6, len);
+ icmp6->icmp_sum = CHECKSUM_CARRY(sum);
+ break;
+
case IPPROTO_IP:
ipv4->ip_sum = 0;
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