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Use aligned ICMPv6 header structs in traceND

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This commit is contained in:
dmiller 2026-04-22 16:13:09 +00:00
parent dc6b27be7e
commit dc3d01b783
1 changed files with 13 additions and 13 deletions
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26
tcpip.cc
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@ -167,8 +167,8 @@ void PacketTrace::traceND(pdirection pdir, const u8 *frame, u32 len,
struct timeval *now) {
struct timeval tv;
struct ip6_hdr ip6;
const struct icmpv6_hdr *icmpv6;
const union icmpv6_msg *msg;
struct icmpv6_hdr icmpv6;
union icmpv6_msg msg;
size_t msg_len;
const char *label;
char src[INET6_ADDRSTRLEN], dst[INET6_ADDRSTRLEN];
@ -191,36 +191,36 @@ void PacketTrace::traceND(pdirection pdir, const u8 *frame, u32 len,
else
gettimeofday(&tv, NULL);
if (len < sizeof(ip6) + sizeof(*icmpv6)) {
if (len < sizeof(ip6) + sizeof(icmpv6) + sizeof(msg)) {
error("Packet tracer: ND packets must be at least %lu bytes long (is %lu).",
(unsigned long) (sizeof(ip6) + sizeof(*icmpv6)),
(unsigned long) (sizeof(ip6) + sizeof(icmpv6) + sizeof(msg)),
(unsigned long) len);
return;
}
memcpy(&ip6, frame, sizeof(ip6));
icmpv6 = (struct icmpv6_hdr *) (frame + sizeof(ip6));
msg = (union icmpv6_msg *) (frame + sizeof(ip6) + sizeof(*icmpv6));
msg_len = frame + len - (u8 *) msg;
memcpy(&icmpv6, frame + sizeof(ip6), sizeof(icmpv6));
memcpy(&msg, frame + sizeof(ip6) + sizeof(icmpv6), sizeof(msg));
msg_len = len - (sizeof(ip6) + sizeof(icmpv6) + sizeof(msg));
if (icmpv6->icmpv6_type == ICMPV6_NEIGHBOR_SOLICITATION) {
if (icmpv6.icmpv6_type == ICMPV6_NEIGHBOR_SOLICITATION) {
label = "neighbor solicitation";
if (msg_len < 20) {
Snprintf(desc, sizeof(desc), "packet too short");
} else {
inet_ntop(AF_INET6, (void *)&msg->nd.icmpv6_target, who_has, sizeof(who_has));
inet_ntop(AF_INET6, (void *)&msg.nd.icmpv6_target, who_has, sizeof(who_has));
Snprintf(desc, sizeof(desc), "who has %s", who_has);
}
} else if (icmpv6->icmpv6_type == ICMPV6_NEIGHBOR_ADVERTISEMENT) {
} else if (icmpv6.icmpv6_type == ICMPV6_NEIGHBOR_ADVERTISEMENT) {
label = "neighbor advertisement";
if (msg_len < 28) {
Snprintf(desc, sizeof(desc), "packet too short");
} else if (msg->nd.icmpv6_option_length == 0 || msg->nd.icmpv6_option_type != 2) {
} else if (msg.nd.icmpv6_option_length == 0 || msg.nd.icmpv6_option_type != 2) {
/* We only handle target link-layer address in the first option. */
Snprintf(desc, sizeof(desc), "no link-layer address");
} else {
inet_ntop(AF_INET6, (void *)&msg->nd.icmpv6_target, tgt_is, sizeof(tgt_is));
inet_ntop(AF_INET6, (void *)&msg.nd.icmpv6_target, tgt_is, sizeof(tgt_is));
Snprintf(desc, sizeof(desc), "%s is at %s",
tgt_is, eth_ntoa(&msg->nd.icmpv6_mac));
tgt_is, eth_ntoa(&msg.nd.icmpv6_mac));
}
} else {
error("Unknown ICMPV6 type in %s.", __func__);