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dhcp: Introduce support for Rapid Commit (option 80, RFC 4039)

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I'm trying to speed up and simplify IP address acquisition in muvm.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefano Brivio 2024-11-15 18:18:22 +01:00
parent d6e9e2486f
commit 9da2038485
1 changed files with 9 additions and 2 deletions
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11
dhcp.c
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@ -342,9 +342,16 @@ int dhcp(const struct ctx *c, const struct pool *p)
opt_off += *olen + 2;
}
opts[80].slen = -1;
if (opts[53].clen > 0 && opts[53].c[0] == DHCPDISCOVER) {
info("DHCP: offer to discover");
opts[53].s[0] = DHCPOFFER;
if (opts[80].clen == -1) {
info("DHCP: offer to discover");
opts[53].s[0] = DHCPOFFER;
} else {
info("DHCP: ack to discover (Rapid Commit)");
opts[53].s[0] = DHCPACK;
opts[80].slen = 0;
}
} else if (opts[53].clen <= 0 || opts[53].c[0] == DHCPREQUEST) {
info("%s: ack to request", /* DHCP needs a valid message type */
(opts[53].clen <= 0) ? "BOOTP" : "DHCP");