diff options
Diffstat (limited to 'dhcp.c')
| -rw-r--r-- | dhcp.c | 6 |
1 files changed, 4 insertions, 2 deletions
@@ -268,6 +268,7 @@ static void opt_set_dns_search(const struct ctx *c, size_t max_len) int dhcp(const struct ctx *c, const struct pool *p) { size_t mlen, len, offset = 0, opt_len, opt_off = 0; + struct in_addr mask; struct ethhdr *eh; struct iphdr *iph; struct udphdr *uh; @@ -334,14 +335,15 @@ int dhcp(const struct ctx *c, const struct pool *p) m->chaddr[3], m->chaddr[4], m->chaddr[5]); m->yiaddr = c->ip4.addr; - memcpy(opts[1].s, &c->ip4.mask, sizeof(c->ip4.mask)); + mask.s_addr = htonl(0xffffffff << c->ip4.prefix_len); + memcpy(opts[1].s, &mask, sizeof(mask)); memcpy(opts[3].s, &c->ip4.gw, sizeof(c->ip4.gw)); memcpy(opts[54].s, &c->ip4.gw, sizeof(c->ip4.gw)); /* If the gateway is not on the assigned subnet, send an option 121 * (Classless Static Routing) adding a dummy route to it. */ - if ((c->ip4.addr & c->ip4.mask) != (c->ip4.gw & c->ip4.mask)) { + if ((c->ip4.addr & mask.s_addr) != (c->ip4.gw & mask.s_addr)) { /* a.b.c.d/32:0.0.0.0, 0:a.b.c.d */ opts[121].slen = 14; opts[121].s[0] = 32; |