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resolve: do not set IPv4 specific options on IPv6 socket

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This commit is contained in:
Yu Watanabe 2020-09-04 15:22:36 +09:00
parent d40f00d798
commit af8b138422
1 changed files with 34 additions and 13 deletions
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47
src/resolve/resolved-dns-stub.c
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@ -5,6 +5,7 @@
#include "errno-util.h"
#include "fd-util.h"
#include "missing_network.h"
#include "missing_socket.h"
#include "resolved-dns-stub.h"
#include "socket-netlink.h"
#include "socket-util.h"
@ -406,20 +407,35 @@ static int on_dns_stub_packet(sd_event_source *s, int fd, uint32_t revents, void
return 0;
}
static int set_dns_stub_common_socket_options(int fd) {
static int set_dns_stub_common_socket_options(int fd, int family) {
int r;
assert(fd >= 0);
assert(IN_SET(family, AF_INET, AF_INET6));
r = setsockopt_int(fd, SOL_SOCKET, SO_REUSEADDR, true);
if (r < 0)
return r;
r = setsockopt_int(fd, IPPROTO_IP, IP_PKTINFO, true);
if (r < 0)
return r;
if (family == AF_INET) {
r = setsockopt_int(fd, IPPROTO_IP, IP_PKTINFO, true);
if (r < 0)
return r;
return setsockopt_int(fd, IPPROTO_IP, IP_RECVTTL, true);
r = setsockopt_int(fd, IPPROTO_IP, IP_RECVTTL, true);
if (r < 0)
return r;
} else {
r = setsockopt_int(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, true);
if (r < 0)
return r;
r = setsockopt_int(fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, true);
if (r < 0)
return r;
}
return 0;
}
static int manager_dns_stub_udp_fd(Manager *m) {
@ -438,7 +454,7 @@ static int manager_dns_stub_udp_fd(Manager *m) {
if (fd < 0)
return -errno;
r = set_dns_stub_common_socket_options(fd);
r = set_dns_stub_common_socket_options(fd, AF_INET);
if (r < 0)
return r;
@ -487,11 +503,13 @@ static int manager_dns_stub_udp_fd_extra(Manager *m, DNSStubListenerExtra *l) {
goto fail;
}
r = setsockopt_int(fd, IPPROTO_IP, IP_FREEBIND, true);
if (r < 0)
goto fail;
if (l->family == AF_INET) {
r = setsockopt_int(fd, IPPROTO_IP, IP_FREEBIND, true);
if (r < 0)
goto fail;
}
r = set_dns_stub_common_socket_options(fd);
r = set_dns_stub_common_socket_options(fd, l->family);
if (r < 0)
goto fail;
@ -592,7 +610,7 @@ static int manager_dns_stub_tcp_fd(Manager *m) {
if (fd < 0)
return -errno;
r = set_dns_stub_common_socket_options(fd);
r = set_dns_stub_common_socket_options(fd, AF_INET);
if (r < 0)
return r;
@ -648,14 +666,17 @@ static int manager_dns_stub_tcp_fd_extra(Manager *m, DNSStubListenerExtra *l) {
goto fail;
}
r = set_dns_stub_common_socket_options(fd);
r = set_dns_stub_common_socket_options(fd, l->family);
if (r < 0)
goto fail;
/* Do not set IP_TTL for extra DNS stub listners, as the address may not be local and in that
* case people may want ttl > 1. */
r = setsockopt_int(fd, IPPROTO_IP, IP_FREEBIND, true);
if (l->family == AF_INET)
r = setsockopt_int(fd, IPPROTO_IP, IP_FREEBIND, true);
else
r = setsockopt_int(fd, IPPROTO_IPV6, IPV6_FREEBIND, true);
if (r < 0)
goto fail;