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passt: Introduce a DHCPv6 server

Browse source 
This implementation, similarly to the IPv4 DHCP one, hands out a
single address, which is the same as the upstream address for the
host.

This avoids the need for address translation as long as the client
runs a DHCPv6 client. The NDP "Managed" flag is now set in Router
Advertisements.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-04-13 21:59:47 +02:00
parent 6b1a9f0d34
commit 4aa8e54a30
6 changed files with 530 additions and 19 deletions

17
passt.c
View file

@ -47,6 +47,7 @@
#include "arp.h"
#include "dhcp.h"
#include "ndp.h"
#include "dhcpv6.h"
#include "util.h"
#include "icmp.h"
#include "tcp.h"
@ -308,6 +309,9 @@ static void tap4_handler(struct ctx *c, char *in, size_t len)
char buf_d[BUFSIZ] __attribute((__unused__));
char *l4h;
if (!c->v4)
return;
if (arp(c, eh, len) || dhcp(c, eh, len))
return;
@ -358,17 +362,17 @@ static void tap6_handler(struct ctx *c, char *in, size_t len)
uint8_t proto;
char *l4h;
if (!c->v6)
return;
if (len < sizeof(*eh) + sizeof(*ip6h))
return;
if (ndp(c, eh, len))
if (ndp(c, eh, len) || dhcpv6(c, eh, len))
return;
l4h = ipv6_l4hdr(ip6h, &proto);
/* TODO: Assign MAC address to guest so that, together with prefix
* assigned via NDP, address matches the one from the host.
*/
c->addr6_guest = ip6h->saddr;
ip6h->saddr = c->addr6;
@ -559,6 +563,9 @@ int main(int argc, char **argv)
if (icmp_sock_init(&c) || tcp_sock_init(&c) || udp_sock_init(&c))
exit(EXIT_FAILURE);
if (c.v6)
dhcpv6_init(&c);
if (c.v4) {
info("ARP:");
info(" address: %02x:%02x:%02x:%02x:%02x:%02x from %s",
@ -575,7 +582,7 @@ int main(int argc, char **argv)
inet_ntop(AF_INET, &c.dns4, buf4[3], sizeof(buf4[3])));
}
if (c.v6) {
info("NDP:");
info("NDP/DHCPv6:");
info(" assign: %s",
inet_ntop(AF_INET6, &c.addr6, buf6[0], sizeof(buf6[0])));
info(" router: %s",