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Handle options other than source link-layer address in router solicitations.

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RFC 4861 para 4.1 is a MUST.
This commit is contained in:
Simon Kelley
2022-01-29 23:22:52 +00:00
parent b5dafc0b7e
commit ed200fa001
1 changed files with 16 additions and 8 deletions
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18
src/radv.c
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@@ -198,20 +198,28 @@ void icmp6_packet(time_t now)
{
char *mac = "";
struct dhcp_bridge *bridge, *alias;
ssize_t rem;
unsigned char *p;
int opt_sz;
#ifdef HAVE_DUMPFILE
dump_packet(DUMP_RA, (void *)packet, sz, (union mysockaddr *)&from, NULL, -1);
#endif
/* look for link-layer address option for logging */
if (sz >= 16 && packet[8] == ICMP6_OPT_SOURCE_MAC && (packet[9] * 8) + 8 <= sz)
for (rem = sz - 8, p = &packet[8]; rem >= 2; rem -= opt_sz, p += opt_sz)
{
if ((packet[9] * 8 - 2) * 3 - 1 >= MAXDNAME) {
return;
}
print_mac(daemon->namebuff, &packet[10], (packet[9] * 8) - 2);
opt_sz = p[1] * 8;
if (opt_sz == 0 || opt_sz > rem)
return; /* Bad packet */
if (p[0] == ICMP6_OPT_SOURCE_MAC && ((opt_sz - 2) * 3 - 1 < MAXDNAME))
{
print_mac(daemon->namebuff, &p[2], opt_sz - 2);
mac = daemon->namebuff;
}
}
if (!option_bool(OPT_QUIET_RA))
my_syslog(MS_DHCP | LOG_INFO, "RTR-SOLICIT(%s) %s", interface, mac);