From 1e49d194d01788afbc4b8216e27c794651a4facf Mon Sep 17 00:00:00 2001 From: Stefano Brivio Date: Thu, 12 Aug 2021 15:42:43 +0200 Subject: passt, pasta: Introduce command-line options and port re-mapping Signed-off-by: Stefano Brivio --- dhcp.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'dhcp.c') diff --git a/dhcp.c b/dhcp.c index ed5df27..04b04af 100644 --- a/dhcp.c +++ b/dhcp.c @@ -272,6 +272,9 @@ int dhcp(struct ctx *c, struct ethhdr *eh, size_t len) if (uh->dest != htons(67)) return 0; + if (c->no_dhcp) + return 1; + mlen = len - sizeof(*eh) - iph->ihl * 4 - sizeof(*uh); if (mlen != ntohs(uh->len) - sizeof(*uh) || mlen < offsetof(struct msg, o) || @@ -305,6 +308,12 @@ int dhcp(struct ctx *c, struct ethhdr *eh, size_t len) *(unsigned long *)opts[3].s = c->gw4; *(unsigned long *)opts[54].s = c->gw4; + if (c->mtu) { + opts[26].slen = 2; + opts[26].s[0] = c->mtu / 256; + opts[26].s[1] = c->mtu % 256; + } + for (i = 0, opts[6].slen = 0; c->dns4[i]; i++) { ((uint32_t *)opts[6].s)[i] = c->dns4[i]; opts[6].slen += sizeof(uint32_t); -- cgit v1.2.3