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tcp, udp: Allow binding ports in init namespace to both tap and loopback

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Traffic with loopback source address will be forwarded to the direct
loopback connection in the namespace, and the tap interface is used
for the rest.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-07-26 14:10:29 +02:00
parent f4aaa471a1
commit 86b273150a
6 changed files with 144 additions and 64 deletions
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15
passt.c
View File

@ -329,15 +329,27 @@ static int get_bound_ports_ns(void *arg)
procfs_scan_listen("tcp", c->tcp.port4_to_tap);
procfs_scan_listen("tcp", c->udp.port4_to_tap);
procfs_scan_listen("udp", c->udp.port4_to_tap);
procfs_scan_listen("tcp", c->tcp.port4_to_ns);
procfs_scan_listen("tcp", c->udp.port4_to_ns);
procfs_scan_listen("udp", c->udp.port4_to_ns);
}
if (c->v6) {
if (c->v4) {
procfs_scan_listen("tcp6", c->tcp.port4_to_tap);
procfs_scan_listen("tcp6", c->udp.port4_to_tap);
procfs_scan_listen("udp6", c->udp.port4_to_tap);
procfs_scan_listen("tcp6", c->tcp.port4_to_ns);
procfs_scan_listen("tcp6", c->udp.port4_to_ns);
procfs_scan_listen("udp6", c->udp.port4_to_ns);
}
procfs_scan_listen("tcp6", c->tcp.port6_to_tap);
procfs_scan_listen("tcp6", c->udp.port6_to_tap);
procfs_scan_listen("udp6", c->udp.port6_to_tap);
procfs_scan_listen("tcp6", c->tcp.port6_to_ns);
procfs_scan_listen("tcp6", c->udp.port6_to_ns);
procfs_scan_listen("udp6", c->udp.port6_to_ns);
@ -359,16 +371,19 @@ static void get_bound_ports(struct ctx *c)
if (c->v4) {
procfs_scan_listen("tcp", c->tcp.port4_to_init);
procfs_scan_listen("tcp", c->udp.port4_to_init);
procfs_scan_listen("udp", c->udp.port4_to_init);
}
if (c->v6) {
if (c->v4) {
procfs_scan_listen("tcp6", c->tcp.port4_to_init);
procfs_scan_listen("tcp6", c->udp.port4_to_init);
procfs_scan_listen("udp6", c->udp.port4_to_init);
}
procfs_scan_listen("tcp6", c->tcp.port6_to_init);
procfs_scan_listen("tcp6", c->udp.port6_to_init);
procfs_scan_listen("udp6", c->udp.port6_to_init);
}

59
tcp.c
View File

@ -2095,7 +2095,8 @@ static int tcp_sock_init_ns(void *arg)
continue;
tref.index = port;
sock_l4(c, AF_INET, IPPROTO_TCP, port, 1, tref.u32);
sock_l4(c, AF_INET, IPPROTO_TCP, port, BIND_LOOPBACK,
tref.u32);
}
}
@ -2106,7 +2107,8 @@ static int tcp_sock_init_ns(void *arg)
continue;
tref.index = port;
sock_l4(c, AF_INET6, IPPROTO_TCP, port, 1, tref.u32);
sock_l4(c, AF_INET6, IPPROTO_TCP, port, BIND_LOOPBACK,
tref.u32);
}
}
@ -2123,6 +2125,7 @@ int tcp_sock_init(struct ctx *c)
{
union tcp_epoll_ref tref = { .listen = 1 };
char ns_fn_stack[NS_FN_STACK_SIZE];
enum bind_type tap_bind;
in_port_t port;
getrandom(&c->tcp.hash_secret, sizeof(c->tcp.hash_secret), GRND_RANDOM);
@ -2130,33 +2133,49 @@ int tcp_sock_init(struct ctx *c)
if (c->v4) {
tref.v6 = 0;
for (port = 0; port < USHRT_MAX; port++) {
if (bitmap_isset(c->tcp.port4_to_ns, port))
tref.splice = 1;
else if (bitmap_isset(c->tcp.port4_to_tap, port))
tref.splice = 0;
else
continue;
tref.index = port;
sock_l4(c, AF_INET, IPPROTO_TCP, port, tref.splice,
tref.u32);
if (bitmap_isset(c->tcp.port4_to_ns, port)) {
tref.splice = 1;
sock_l4(c, AF_INET, IPPROTO_TCP, port,
BIND_LOOPBACK, tref.u32);
tap_bind = BIND_EXT;
} else {
tap_bind = BIND_ANY;
}
if (bitmap_isset(c->tcp.port4_to_tap, port)) {
tref.splice = 0;
sock_l4(c, AF_INET, IPPROTO_TCP, port,
tap_bind, tref.u32);
}
}
tcp_sock4_iov_init();
}
if (c->v6) {
tref.v6 = 1;
for (port = 0; port < USHRT_MAX; port++) {
if (bitmap_isset(c->tcp.port6_to_ns, port))
tref.splice = 1;
else if (bitmap_isset(c->tcp.port6_to_tap, port))
tref.splice = 0;
else
continue;
tref.index = port;
sock_l4(c, AF_INET6, IPPROTO_TCP, port, tref.splice,
tref.u32);
if (bitmap_isset(c->tcp.port6_to_ns, port)) {
tref.splice = 1;
sock_l4(c, AF_INET6, IPPROTO_TCP, port,
BIND_LOOPBACK, tref.u32);
tap_bind = BIND_EXT;
} else {
tap_bind = BIND_ANY;
}
if (bitmap_isset(c->tcp.port6_to_tap, port)) {
tref.splice = 0;
sock_l4(c, AF_INET6, IPPROTO_TCP, port,
tap_bind, tref.u32);
}
}
tcp_sock6_iov_init();
}
if (c->mode == MODE_PASTA) {

109
udp.c
View File

@ -125,11 +125,13 @@
* @sock: Socket bound to source port used as index
* @ts: Activity timestamp from tap, used for socket aging
* @ts_local: Timestamp of tap packet to gateway address, aging for local bind
* @loopback: Whether local bind should use loopback address as source
*/
struct udp_tap_port {
int sock;
time_t ts;
time_t ts_local;
int loopback;
};
/**
@ -201,7 +203,7 @@ udp4_l2_buf[UDP_TAP_FRAMES] = {
};
/**
* udp4_l2_buf_t - Pre-cooked IPv6 packet buffers for tap connections
* udp6_l2_buf_t - Pre-cooked IPv6 packet buffers for tap connections
* @s_in6: Source socket address, filled in by recvmmsg()
* @vnet_len: 4-byte qemu vnet buffer length descriptor, only for passt mode
* @eh: Pre-filled Ethernet header
@ -644,19 +646,25 @@ void udp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
b->ip6h.payload_len = htons(udp6_l2_mh_sock[i].msg_len +
sizeof(b->uh));
if (IN6_IS_ADDR_LOOPBACK(&b->s_in6.sin6_addr) ||
!memcmp(&b->s_in6.sin6_addr, &c->addr6_seen,
sizeof(c->addr6))) {
if (IN6_IS_ADDR_LINKLOCAL(&b->s_in6.sin6_addr)) {
b->ip6h.daddr = c->addr6_ll_seen;
b->ip6h.saddr = b->s_in6.sin6_addr;
} else if (IN6_IS_ADDR_LOOPBACK(&b->s_in6.sin6_addr) ||
!memcmp(&b->s_in6.sin6_addr, &c->addr6_seen,
sizeof(c->addr6))) {
in_port_t src = htons(b->s_in6.sin6_port);
b->ip6h.daddr = c->addr6_seen;
b->ip6h.daddr = c->addr6_ll_seen;
b->ip6h.saddr = c->gw6;
udp_tap_map[V6][src].ts_local = now->tv_sec;
if (IN6_IS_ADDR_LOOPBACK(&b->s_in6.sin6_addr))
udp_tap_map[V6][src].loopback = 1;
else
udp_tap_map[V6][src].loopback = 0;
bitmap_set(udp_act[V6][UDP_ACT_TAP], src);
} else if (IN6_IS_ADDR_LINKLOCAL(&b->s_in6.sin6_addr)) {
b->ip6h.daddr = c->addr6_ll_seen;
b->ip6h.saddr = b->s_in6.sin6_addr;
} else {
b->ip6h.daddr = c->addr6_seen;
b->ip6h.saddr = b->s_in6.sin6_addr;
@ -733,6 +741,12 @@ void udp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
b->iph.saddr = c->gw4;
udp_tap_map[V4][src].ts_local = now->tv_sec;
if (b->s_in.sin_addr.s_addr == c->addr4_seen)
udp_tap_map[V4][src].loopback = 0;
else
udp_tap_map[V4][src].loopback = 1;
bitmap_set(udp_act[V4][UDP_ACT_TAP], src);
} else {
b->iph.saddr = b->s_in.sin_addr.s_addr;
@ -840,8 +854,12 @@ int udp_tap_handler(struct ctx *c, int af, void *addr,
udp_tap_map[V4][src].ts = now->tv_sec;
if (s_in.sin_addr.s_addr == c->gw4 &&
udp_tap_map[V4][dst].ts_local)
s_in.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
udp_tap_map[V4][dst].ts_local) {
if (udp_tap_map[V4][dst].loopback)
s_in.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
else
s_in.sin_addr.s_addr = c->addr4_seen;
}
} else {
s_in6 = (struct sockaddr_in6) {
.sin6_family = AF_INET6,
@ -868,8 +886,12 @@ int udp_tap_handler(struct ctx *c, int af, void *addr,
udp_tap_map[V6][src].ts = now->tv_sec;
if (!memcmp(addr, &c->gw6, sizeof(c->gw6)) &&
udp_tap_map[V6][dst].ts_local)
s_in6.sin6_addr = in6addr_loopback;
udp_tap_map[V6][dst].ts_local) {
if (udp_tap_map[V6][dst].loopback)
s_in6.sin6_addr = in6addr_loopback;
else
s_in6.sin6_addr = c->addr6_seen;
}
}
for (i = 0; i < count; i++) {
@ -911,7 +933,8 @@ int udp_sock_init_ns(void *arg)
continue;
uref.port = port;
sock_l4(c, AF_INET, IPPROTO_UDP, port, 1, uref.u32);
sock_l4(c, AF_INET, IPPROTO_UDP, port, BIND_LOOPBACK,
uref.u32);
}
}
@ -922,7 +945,8 @@ int udp_sock_init_ns(void *arg)
continue;
uref.port = port;
sock_l4(c, AF_INET6, IPPROTO_UDP, port, 1, uref.u32);
sock_l4(c, AF_INET6, IPPROTO_UDP, port, BIND_LOOPBACK,
uref.u32);
}
}
@ -992,24 +1016,31 @@ int udp_sock_init(struct ctx *c)
{
union udp_epoll_ref uref = { .bound = 1 };
char ns_fn_stack[NS_FN_STACK_SIZE];
enum bind_type tap_bind;
in_port_t port;
int s;
if (c->v4) {
uref.v6 = 0;
for (port = 0; port < USHRT_MAX; port++) {
if (bitmap_isset(c->udp.port4_to_ns, port))
uref.splice = UDP_TO_NS;
else if (bitmap_isset(c->udp.port4_to_tap, port))
uref.splice = 0;
else
continue;
uref.port = port;
s = sock_l4(c, AF_INET, IPPROTO_UDP, port,
uref.splice == UDP_TO_NS, uref.u32);
if (!uref.splice && s > 0)
udp_tap_map[V4][port].sock = s;
if (bitmap_isset(c->udp.port4_to_ns, port)) {
uref.splice = UDP_TO_NS;
sock_l4(c, AF_INET, IPPROTO_UDP, port,
BIND_LOOPBACK, uref.u32);
tap_bind = BIND_EXT;
} else {
tap_bind = BIND_ANY;
}
if (bitmap_isset(c->udp.port4_to_tap, port)) {
uref.splice = 0;
s = sock_l4(c, AF_INET, IPPROTO_UDP, port,
tap_bind, uref.u32);
if (s > 0)
udp_tap_map[V4][port].sock = s;
}
}
udp_sock4_iov_init();
@ -1018,18 +1049,24 @@ int udp_sock_init(struct ctx *c)
if (c->v6) {
uref.v6 = 1;
for (port = 0; port < USHRT_MAX; port++) {
if (bitmap_isset(c->udp.port6_to_ns, port))
uref.splice = UDP_TO_NS;
else if (bitmap_isset(c->udp.port6_to_tap, port))
uref.splice = 0;
else
continue;
uref.port = port;
s = sock_l4(c, AF_INET6, IPPROTO_UDP, port,
uref.splice == UDP_TO_NS, uref.u32);
if (!uref.splice && s > 0)
udp_tap_map[V6][port].sock = s;
if (bitmap_isset(c->udp.port6_to_ns, port)) {
uref.splice = UDP_TO_NS;
sock_l4(c, AF_INET6, IPPROTO_UDP, port,
BIND_LOOPBACK, uref.u32);
tap_bind = BIND_EXT;
} else {
tap_bind = BIND_ANY;
}
if (bitmap_isset(c->udp.port6_to_tap, port)) {
uref.splice = 0;
s = sock_l4(c, AF_INET6, IPPROTO_UDP, port,
tap_bind, uref.u32);
if (s > 0)
udp_tap_map[V6][port].sock = s;
}
}
udp_sock6_iov_init();

1
udp.h
View File

@ -35,7 +35,6 @@ union udp_epoll_ref {
uint32_t u32;
};
/**
* struct udp_ctx - Execution context for UDP
* @port6_to_tap: IPv6 ports bound host/init-side, packets to guest/tap

14
util.c
View File

@ -125,13 +125,13 @@ char *ipv6_l4hdr(struct ipv6hdr *ip6h, uint8_t *proto)
* @af: Address family, AF_INET or AF_INET6
* @proto: Protocol number
* @port: Port, host order
* @lo: Bind to loopback address only, if set
* @bind_type: Type of address for binding
* @data: epoll reference portion for protocol handlers
*
* Return: newly created socket, -1 on error
*/
int sock_l4(struct ctx *c, int af, uint8_t proto, uint16_t port, int lo,
uint32_t data)
int sock_l4(struct ctx *c, int af, uint8_t proto, uint16_t port,
enum bind_type bind_addr, uint32_t data)
{
union epoll_ref ref = { .proto = proto, .data = data };
struct sockaddr_in addr4 = {
@ -161,16 +161,20 @@ int sock_l4(struct ctx *c, int af, uint8_t proto, uint16_t port, int lo,
ref.s = fd;
if (af == AF_INET) {
if (lo)
if (bind_addr == BIND_LOOPBACK)
addr4.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
else if (bind_addr == BIND_EXT)
addr4.sin_addr.s_addr = c->addr4;
else
addr4.sin_addr.s_addr = htonl(INADDR_ANY);
sa = (const struct sockaddr *)&addr4;
sl = sizeof(addr4);
} else {
if (lo)
if (bind_addr == BIND_LOOPBACK)
addr6.sin6_addr = in6addr_loopback;
else if (bind_addr == BIND_EXT)
addr6.sin6_addr = c->addr6;
else
addr6.sin6_addr = in6addr_any;

10
util.h
View File

@ -115,11 +115,17 @@ void debug(const char *format, ...);
#include <linux/ip.h>
#include <limits.h>
enum bind_type {
BIND_ANY = 0,
BIND_LOOPBACK,
BIND_EXT,
};
struct ctx;
char *ipv6_l4hdr(struct ipv6hdr *ip6h, uint8_t *proto);
int sock_l4(struct ctx *c, int af, uint8_t proto, uint16_t port, int lo,
uint32_t data);
int sock_l4(struct ctx *c, int af, uint8_t proto, uint16_t port,
enum bind_type bind_addr, uint32_t data);
int timespec_diff_ms(struct timespec *a, struct timespec *b);
void bitmap_set(uint8_t *map, int bit);
void bitmap_clear(uint8_t *map, int bit);