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udhcpc6: preparatory patch, no code changes

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-01-16 21:35:39 +01:00
parent 688cb3bc19
commit 1e8d79ba12
1 changed files with 37 additions and 37 deletions
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74
networking/udhcp/d6_dhcpc.c
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@ -1589,44 +1589,44 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
* . .
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
free(client6_data.ia_na);
client6_data.ia_na = d6_copy_option(packet.d6_options, packet_end, D6_OPT_IA_NA);
if (!client6_data.ia_na) {
bb_error_msg("no %s option, ignoring packet", "IA_NA");
continue;
}
if (client6_data.ia_na->len < (4 + 4 + 4) + (2 + 2 + 16 + 4 + 4)) {
bb_error_msg("IA_NA option is too short:%d bytes", client6_data.ia_na->len);
continue;
}
iaaddr = d6_find_option(client6_data.ia_na->data + 4 + 4 + 4,
client6_data.ia_na->data + client6_data.ia_na->len,
D6_OPT_IAADDR
);
if (!iaaddr) {
bb_error_msg("no %s option, ignoring packet", "IAADDR");
continue;
}
if (iaaddr->len < (16 + 4 + 4)) {
bb_error_msg("IAADDR option is too short:%d bytes", iaaddr->len);
continue;
}
/* Note: the address is sufficiently aligned for cast:
* we _copied_ IA-NA, and copy is always well-aligned.
*/
requested_ipv6 = (struct in6_addr*) iaaddr->data;
move_from_unaligned32(lease_seconds, iaaddr->data + 16 + 4);
lease_seconds = ntohl(lease_seconds);
/* paranoia: must not be too small and not prone to overflows */
if (lease_seconds < 0x10)
lease_seconds = 0x10;
free(client6_data.ia_na);
client6_data.ia_na = d6_copy_option(packet.d6_options, packet_end, D6_OPT_IA_NA);
if (!client6_data.ia_na) {
bb_error_msg("no %s option, ignoring packet", "IA_NA");
continue;
}
if (client6_data.ia_na->len < (4 + 4 + 4) + (2 + 2 + 16 + 4 + 4)) {
bb_error_msg("IA_NA option is too short:%d bytes", client6_data.ia_na->len);
continue;
}
iaaddr = d6_find_option(client6_data.ia_na->data + 4 + 4 + 4,
client6_data.ia_na->data + client6_data.ia_na->len,
D6_OPT_IAADDR
);
if (!iaaddr) {
bb_error_msg("no %s option, ignoring packet", "IAADDR");
continue;
}
if (iaaddr->len < (16 + 4 + 4)) {
bb_error_msg("IAADDR option is too short:%d bytes", iaaddr->len);
continue;
}
/* Note: the address is sufficiently aligned for cast:
* we _copied_ IA-NA, and copy is always well-aligned.
*/
requested_ipv6 = (struct in6_addr*) iaaddr->data;
move_from_unaligned32(lease_seconds, iaaddr->data + 16 + 4);
lease_seconds = ntohl(lease_seconds);
/* paranoia: must not be too small and not prone to overflows */
if (lease_seconds < 0x10)
lease_seconds = 0x10;
/// TODO: check for 0 lease time?
if (lease_seconds > 0x7fffffff / 1000)
lease_seconds = 0x7fffffff / 1000;
/* enter bound state */
timeout = lease_seconds / 2;
bb_error_msg("lease obtained, lease time %u",
/*inet_ntoa(temp_addr),*/ (unsigned)lease_seconds);
if (lease_seconds > 0x7fffffff / 1000)
lease_seconds = 0x7fffffff / 1000;
/* enter bound state */
timeout = lease_seconds / 2;
bb_error_msg("lease obtained, lease time %u",
/*inet_ntoa(temp_addr),*/ (unsigned)lease_seconds);
d6_run_script(&packet, state == REQUESTING ? "bound" : "renew");
state = BOUND;