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conf, udp: Drop mostly duplicated dns_send arrays, rename related fields

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Given that we use just the first valid DNS resolver address
configured, or read from resolv.conf(5) on the host, to forward DNS
queries to, in case --dns-forward is used, we don't need to duplicate
dns[] to dns_send[]:

- rename dns_send[] back to dns[]: those are the resolvers we
  advertise to the guest/container

- for forwarding purposes, instead of dns[], use a single field (for
  each protocol version): dns_host

- and rename dns_fwd to dns_match, so that it's clear this is the
  address we are matching DNS queries against, to decide if they need
  to be forwarded

Suggested-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefano Brivio 2022-11-10 20:30:03 +01:00
parent 4129764eca
commit 3a2afde87d
6 changed files with 62 additions and 71 deletions

21
udp.c
View file

@ -678,10 +678,10 @@ static void udp_sock_fill_data_v4(const struct ctx *c, int n,
src_port = ntohs(b->s_in.sin_port);
if (!IN4_IS_ADDR_UNSPECIFIED(&c->ip4.dns_fwd) &&
IN4_ARE_ADDR_EQUAL(&b->s_in.sin_addr, &c->ip4.dns[0]) &&
if (!IN4_IS_ADDR_UNSPECIFIED(&c->ip4.dns_match) &&
IN4_ARE_ADDR_EQUAL(&b->s_in.sin_addr, &c->ip4.dns_host) &&
src_port == 53) {
b->iph.saddr = c->ip4.dns_fwd.s_addr;
b->iph.saddr = c->ip4.dns_match.s_addr;
} else if (IN4_IS_ADDR_LOOPBACK(&b->s_in.sin_addr) ||
IN4_IS_ADDR_UNSPECIFIED(&b->s_in.sin_addr)||
IN4_ARE_ADDR_EQUAL(&b->s_in.sin_addr, &c->ip4.addr_seen)) {
@ -770,10 +770,11 @@ static void udp_sock_fill_data_v6(const struct ctx *c, int n,
if (IN6_IS_ADDR_LINKLOCAL(src)) {
b->ip6h.daddr = c->ip6.addr_ll_seen;
b->ip6h.saddr = b->s_in6.sin6_addr;
} else if (!IN6_IS_ADDR_UNSPECIFIED(&c->ip6.dns_fwd) &&
IN6_ARE_ADDR_EQUAL(src, &c->ip6.dns[0]) && src_port == 53) {
} else if (!IN6_IS_ADDR_UNSPECIFIED(&c->ip6.dns_match) &&
IN6_ARE_ADDR_EQUAL(src, &c->ip6.dns_host) &&
src_port == 53) {
b->ip6h.daddr = c->ip6.addr_seen;
b->ip6h.saddr = c->ip6.dns_fwd;
b->ip6h.saddr = c->ip6.dns_match;
} else if (IN6_IS_ADDR_LOOPBACK(src) ||
IN6_ARE_ADDR_EQUAL(src, &c->ip6.addr_seen) ||
IN6_ARE_ADDR_EQUAL(src, &c->ip6.addr)) {
@ -1016,13 +1017,15 @@ int udp_tap_handler(struct ctx *c, int af, const void *addr,
udp_tap_map[V4][src].ts = now->tv_sec;
if (IN4_ARE_ADDR_EQUAL(&s_in.sin_addr, &c->ip4.gw) && !c->no_map_gw) {
if (IN4_ARE_ADDR_EQUAL(&s_in.sin_addr, &c->ip4.gw) &&
!c->no_map_gw) {
if (!(udp_tap_map[V4][dst].flags & PORT_LOCAL) ||
(udp_tap_map[V4][dst].flags & PORT_LOOPBACK))
s_in.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
else
s_in.sin_addr = c->ip4.addr_seen;
} else if (IN4_ARE_ADDR_EQUAL(&s_in.sin_addr, &c->ip4.dns_fwd) &&
} else if (IN4_ARE_ADDR_EQUAL(&s_in.sin_addr,
&c->ip4.dns_match) &&
ntohs(s_in.sin_port) == 53) {
s_in.sin_addr = c->ip4.dns[0];
}
@ -1045,7 +1048,7 @@ int udp_tap_handler(struct ctx *c, int af, const void *addr,
s_in6.sin6_addr = c->ip6.addr;
else
s_in6.sin6_addr = c->ip6.addr_seen;
} else if (IN6_ARE_ADDR_EQUAL(addr, &c->ip6.dns_fwd) &&
} else if (IN6_ARE_ADDR_EQUAL(addr, &c->ip6.dns_match) &&
ntohs(s_in6.sin6_port) == 53) {
s_in6.sin6_addr = c->ip6.dns[0];
} else if (IN6_IS_ADDR_LINKLOCAL(&s_in6.sin6_addr)) {