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net/dhcpv4: Use router option to set IPv4 GW.

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Change-Id: I58f47c02665990dcb656f7e6f7802e1958b420a8
Signed-off-by: Marcus Shawcroft <marcus.shawcroft@arm.com>
This commit is contained in:
Marcus Shawcroft 2016-12-19 11:56:57 +00:00 committed by Tomasz Bursztyka
parent 065c84d5a6
commit defbc89358
1 changed files with 27 additions and 0 deletions
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27
subsys/net/ip/dhcpv4.c
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@ -545,6 +545,33 @@ static enum net_verdict parse_options(struct net_if *iface, struct net_buf *buf,
NET_DBG("options_subnet_mask %s",
net_sprint_ipv4_addr(&iface->ipv4.netmask));
break;
case DHCPV4_OPTIONS_ROUTER: {
struct in_addr router;
/* Router option may present 1 or more
* addresses for routers on the clients
* subnet. Routers should be listed in order
* of preference. Hence we choose the first
* and skip the rest.
*/
if (length % 4 != 0 || length < 4) {
NET_ERR("options_router, bad length");
return NET_DROP;
}
frag = net_nbuf_read(frag, pos, &pos, 4,
router.s4_addr);
frag = net_nbuf_skip(frag, pos, &pos, length - 4);
if (!frag && pos) {
NET_ERR("options_router, short packet");
return NET_DROP;
}
NET_DBG("options_router: %s",
net_sprint_ipv4_addr(&router));
net_if_ipv4_set_gw(iface, &router);
break;
}
case DHCPV4_OPTIONS_LEASE_TIME:
if (length != 4) {
NET_ERR("options_lease_time, bad length");