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Commit d6a61f80 authored by Craig Gallek's avatar Craig Gallek Committed by David S. Miller
Browse files

soreuseport: test mixed v4/v6 sockets 



Test to validate the behavior of SO_REUSEPORT sockets that are
created with both AF_INET and AF_INET6.  See the commit prior to this
for a description of this behavior.

Signed-off-by: default avatarCraig Gallek <kraig@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d894ba18

tools/testing/selftests/net/.gitignore

+1 −0
Original line number Diff line number Diff line
@@ -3,3 +3,4 @@ psock_fanout 
psock_tpacket

reuseport_bpf

reuseport_bpf_cpu

reuseport_dualstack

tools/testing/selftests/net/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -4,7 +4,7 @@ CFLAGS = -Wall -O2 -g 


CFLAGS += -I../../../../usr/include/



NET_PROGS = socket psock_fanout psock_tpacket reuseport_bpf reuseport_bpf_cpu

NET_PROGS = socket psock_fanout psock_tpacket reuseport_bpf reuseport_bpf_cpu reuseport_dualstack



all: $(NET_PROGS)

%: %.c

tools/testing/selftests/net/reuseport_dualstack.c

0 → 100644
+208 −0
Original line number Diff line number Diff line 
/*

 * It is possible to use SO_REUSEPORT to open multiple sockets bound to

 * equivalent local addresses using AF_INET and AF_INET6 at the same time.  If

 * the AF_INET6 socket has IPV6_V6ONLY set, it's clear which socket should

 * receive a given incoming packet.  However, when it is not set, incoming v4

 * packets should prefer the AF_INET socket(s).  This behavior was defined with

 * the original SO_REUSEPORT implementation, but broke with

 * e32ea7e74727 ("soreuseport: fast reuseport UDP socket selection")

 * This test creates these mixed AF_INET/AF_INET6 sockets and asserts the

 * AF_INET preference for v4 packets.

 */



#define _GNU_SOURCE



#include <arpa/inet.h>

#include <errno.h>

#include <error.h>

#include <linux/in.h>

#include <linux/unistd.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/epoll.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <unistd.h>



static const int PORT = 8888;



static void build_rcv_fd(int family, int proto, int *rcv_fds, int count)

{

	struct sockaddr_storage addr;

	struct sockaddr_in  *addr4;

	struct sockaddr_in6 *addr6;

	int opt, i;



	switch (family) {

	case AF_INET:

		addr4 = (struct sockaddr_in *)&addr;

		addr4->sin_family = AF_INET;

		addr4->sin_addr.s_addr = htonl(INADDR_ANY);

		addr4->sin_port = htons(PORT);

		break;

	case AF_INET6:

		addr6 = (struct sockaddr_in6 *)&addr;

		addr6->sin6_family = AF_INET6;

		addr6->sin6_addr = in6addr_any;

		addr6->sin6_port = htons(PORT);

		break;

	default:

		error(1, 0, "Unsupported family %d", family);

	}



	for (i = 0; i < count; ++i) {

		rcv_fds[i] = socket(family, proto, 0);

		if (rcv_fds[i] < 0)

			error(1, errno, "failed to create receive socket");



		opt = 1;

		if (setsockopt(rcv_fds[i], SOL_SOCKET, SO_REUSEPORT, &opt,

			       sizeof(opt)))

			error(1, errno, "failed to set SO_REUSEPORT");



		if (bind(rcv_fds[i], (struct sockaddr *)&addr, sizeof(addr)))

			error(1, errno, "failed to bind receive socket");



		if (proto == SOCK_STREAM && listen(rcv_fds[i], 10))

			error(1, errno, "failed to listen on receive port");

	}

}



static void send_from_v4(int proto)

{

	struct sockaddr_in  saddr, daddr;

	int fd;



	saddr.sin_family = AF_INET;

	saddr.sin_addr.s_addr = htonl(INADDR_ANY);

	saddr.sin_port = 0;



	daddr.sin_family = AF_INET;

	daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);

	daddr.sin_port = htons(PORT);



	fd = socket(AF_INET, proto, 0);

	if (fd < 0)

		error(1, errno, "failed to create send socket");



	if (bind(fd, (struct sockaddr *)&saddr, sizeof(saddr)))

		error(1, errno, "failed to bind send socket");



	if (connect(fd, (struct sockaddr *)&daddr, sizeof(daddr)))

		error(1, errno, "failed to connect send socket");



	if (send(fd, "a", 1, 0) < 0)

		error(1, errno, "failed to send message");



	close(fd);

}



static int receive_once(int epfd, int proto)

{

	struct epoll_event ev;

	int i, fd;

	char buf[8];



	i = epoll_wait(epfd, &ev, 1, -1);

	if (i < 0)

		error(1, errno, "epoll_wait failed");



	if (proto == SOCK_STREAM) {

		fd = accept(ev.data.fd, NULL, NULL);

		if (fd < 0)

			error(1, errno, "failed to accept");

		i = recv(fd, buf, sizeof(buf), 0);

		close(fd);

	} else {

		i = recv(ev.data.fd, buf, sizeof(buf), 0);

	}



	if (i < 0)

		error(1, errno, "failed to recv");



	return ev.data.fd;

}



static void test(int *rcv_fds, int count, int proto)

{

	struct epoll_event ev;

	int epfd, i, test_fd;

	uint16_t test_family;

	socklen_t len;



	epfd = epoll_create(1);

	if (epfd < 0)

		error(1, errno, "failed to create epoll");



	ev.events = EPOLLIN;

	for (i = 0; i < count; ++i) {

		ev.data.fd = rcv_fds[i];

		if (epoll_ctl(epfd, EPOLL_CTL_ADD, rcv_fds[i], &ev))

			error(1, errno, "failed to register sock epoll");

	}



	send_from_v4(proto);



	test_fd = receive_once(epfd, proto);

	if (getsockopt(test_fd, SOL_SOCKET, SO_DOMAIN, &test_family, &len))

		error(1, errno, "failed to read socket domain");

	if (test_family != AF_INET)

		error(1, 0, "expected to receive on v4 socket but got v6 (%d)",

		      test_family);



	close(epfd);

}



int main(void)

{

	int rcv_fds[32], i;



	fprintf(stderr, "---- UDP IPv4 created before IPv6 ----\n");

	build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 5);

	build_rcv_fd(AF_INET6, SOCK_DGRAM, &(rcv_fds[5]), 5);

	test(rcv_fds, 10, SOCK_DGRAM);

	for (i = 0; i < 10; ++i)

		close(rcv_fds[i]);



	fprintf(stderr, "---- UDP IPv6 created before IPv4 ----\n");

	build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds, 5);

	build_rcv_fd(AF_INET, SOCK_DGRAM, &(rcv_fds[5]), 5);

	test(rcv_fds, 10, SOCK_DGRAM);

	for (i = 0; i < 10; ++i)

		close(rcv_fds[i]);



	/* NOTE: UDP socket lookups traverse a different code path when there

	 * are > 10 sockets in a group.

	 */

	fprintf(stderr, "---- UDP IPv4 created before IPv6 (large) ----\n");

	build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 16);

	build_rcv_fd(AF_INET6, SOCK_DGRAM, &(rcv_fds[16]), 16);

	test(rcv_fds, 32, SOCK_DGRAM);

	for (i = 0; i < 32; ++i)

		close(rcv_fds[i]);



	fprintf(stderr, "---- UDP IPv6 created before IPv4 (large) ----\n");

	build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds, 16);

	build_rcv_fd(AF_INET, SOCK_DGRAM, &(rcv_fds[16]), 16);

	test(rcv_fds, 32, SOCK_DGRAM);

	for (i = 0; i < 32; ++i)

		close(rcv_fds[i]);



	fprintf(stderr, "---- TCP IPv4 created before IPv6 ----\n");

	build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds, 5);

	build_rcv_fd(AF_INET6, SOCK_STREAM, &(rcv_fds[5]), 5);

	test(rcv_fds, 10, SOCK_STREAM);

	for (i = 0; i < 10; ++i)

		close(rcv_fds[i]);



	fprintf(stderr, "---- TCP IPv6 created before IPv4 ----\n");

	build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds, 5);

	build_rcv_fd(AF_INET, SOCK_STREAM, &(rcv_fds[5]), 5);

	test(rcv_fds, 10, SOCK_STREAM);

	for (i = 0; i < 10; ++i)

		close(rcv_fds[i]);



	fprintf(stderr, "SUCCESS\n");

	return 0;

}