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: Craig Gallek <kraig@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Craig Gallek
David S. Miller
parent
d894ba18d4
commit
d6a61f80b8
1
tools/testing/selftests/net/.gitignore
vendored
1
tools/testing/selftests/net/.gitignore
vendored
@ -3,3 +3,4 @@ psock_fanout
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psock_tpacket
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reuseport_bpf
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reuseport_bpf_cpu
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reuseport_dualstack
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@ -4,7 +4,7 @@ CFLAGS = -Wall -O2 -g
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CFLAGS += -I../../../../usr/include/
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NET_PROGS = socket psock_fanout psock_tpacket reuseport_bpf reuseport_bpf_cpu
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NET_PROGS = socket psock_fanout psock_tpacket reuseport_bpf reuseport_bpf_cpu reuseport_dualstack
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all: $(NET_PROGS)
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%: %.c
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208
tools/testing/selftests/net/reuseport_dualstack.c
Normal file
208
tools/testing/selftests/net/reuseport_dualstack.c
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@ -0,0 +1,208 @@
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/*
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* It is possible to use SO_REUSEPORT to open multiple sockets bound to
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* equivalent local addresses using AF_INET and AF_INET6 at the same time. If
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* the AF_INET6 socket has IPV6_V6ONLY set, it's clear which socket should
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* receive a given incoming packet. However, when it is not set, incoming v4
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* packets should prefer the AF_INET socket(s). This behavior was defined with
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* the original SO_REUSEPORT implementation, but broke with
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* e32ea7e74727 ("soreuseport: fast reuseport UDP socket selection")
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* This test creates these mixed AF_INET/AF_INET6 sockets and asserts the
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* AF_INET preference for v4 packets.
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*/
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#define _GNU_SOURCE
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#include <arpa/inet.h>
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#include <errno.h>
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#include <error.h>
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#include <linux/in.h>
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#include <linux/unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/epoll.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <unistd.h>
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static const int PORT = 8888;
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static void build_rcv_fd(int family, int proto, int *rcv_fds, int count)
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{
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struct sockaddr_storage addr;
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struct sockaddr_in *addr4;
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struct sockaddr_in6 *addr6;
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int opt, i;
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switch (family) {
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case AF_INET:
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addr4 = (struct sockaddr_in *)&addr;
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addr4->sin_family = AF_INET;
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addr4->sin_addr.s_addr = htonl(INADDR_ANY);
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addr4->sin_port = htons(PORT);
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break;
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case AF_INET6:
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addr6 = (struct sockaddr_in6 *)&addr;
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addr6->sin6_family = AF_INET6;
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addr6->sin6_addr = in6addr_any;
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addr6->sin6_port = htons(PORT);
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break;
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default:
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error(1, 0, "Unsupported family %d", family);
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}
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for (i = 0; i < count; ++i) {
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rcv_fds[i] = socket(family, proto, 0);
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if (rcv_fds[i] < 0)
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error(1, errno, "failed to create receive socket");
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opt = 1;
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if (setsockopt(rcv_fds[i], SOL_SOCKET, SO_REUSEPORT, &opt,
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sizeof(opt)))
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error(1, errno, "failed to set SO_REUSEPORT");
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if (bind(rcv_fds[i], (struct sockaddr *)&addr, sizeof(addr)))
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error(1, errno, "failed to bind receive socket");
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if (proto == SOCK_STREAM && listen(rcv_fds[i], 10))
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error(1, errno, "failed to listen on receive port");
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}
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}
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static void send_from_v4(int proto)
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{
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struct sockaddr_in saddr, daddr;
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int fd;
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saddr.sin_family = AF_INET;
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saddr.sin_addr.s_addr = htonl(INADDR_ANY);
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saddr.sin_port = 0;
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daddr.sin_family = AF_INET;
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daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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daddr.sin_port = htons(PORT);
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fd = socket(AF_INET, proto, 0);
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if (fd < 0)
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error(1, errno, "failed to create send socket");
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if (bind(fd, (struct sockaddr *)&saddr, sizeof(saddr)))
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error(1, errno, "failed to bind send socket");
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if (connect(fd, (struct sockaddr *)&daddr, sizeof(daddr)))
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error(1, errno, "failed to connect send socket");
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if (send(fd, "a", 1, 0) < 0)
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error(1, errno, "failed to send message");
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close(fd);
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}
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static int receive_once(int epfd, int proto)
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{
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struct epoll_event ev;
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int i, fd;
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char buf[8];
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i = epoll_wait(epfd, &ev, 1, -1);
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if (i < 0)
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error(1, errno, "epoll_wait failed");
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if (proto == SOCK_STREAM) {
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fd = accept(ev.data.fd, NULL, NULL);
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if (fd < 0)
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error(1, errno, "failed to accept");
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i = recv(fd, buf, sizeof(buf), 0);
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close(fd);
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} else {
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i = recv(ev.data.fd, buf, sizeof(buf), 0);
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}
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if (i < 0)
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error(1, errno, "failed to recv");
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return ev.data.fd;
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}
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static void test(int *rcv_fds, int count, int proto)
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{
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struct epoll_event ev;
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int epfd, i, test_fd;
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uint16_t test_family;
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socklen_t len;
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epfd = epoll_create(1);
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if (epfd < 0)
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error(1, errno, "failed to create epoll");
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ev.events = EPOLLIN;
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for (i = 0; i < count; ++i) {
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ev.data.fd = rcv_fds[i];
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if (epoll_ctl(epfd, EPOLL_CTL_ADD, rcv_fds[i], &ev))
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error(1, errno, "failed to register sock epoll");
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}
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send_from_v4(proto);
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test_fd = receive_once(epfd, proto);
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if (getsockopt(test_fd, SOL_SOCKET, SO_DOMAIN, &test_family, &len))
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error(1, errno, "failed to read socket domain");
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if (test_family != AF_INET)
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error(1, 0, "expected to receive on v4 socket but got v6 (%d)",
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test_family);
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close(epfd);
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}
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int main(void)
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{
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int rcv_fds[32], i;
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fprintf(stderr, "---- UDP IPv4 created before IPv6 ----\n");
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build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 5);
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build_rcv_fd(AF_INET6, SOCK_DGRAM, &(rcv_fds[5]), 5);
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test(rcv_fds, 10, SOCK_DGRAM);
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for (i = 0; i < 10; ++i)
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close(rcv_fds[i]);
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fprintf(stderr, "---- UDP IPv6 created before IPv4 ----\n");
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build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds, 5);
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build_rcv_fd(AF_INET, SOCK_DGRAM, &(rcv_fds[5]), 5);
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test(rcv_fds, 10, SOCK_DGRAM);
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for (i = 0; i < 10; ++i)
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close(rcv_fds[i]);
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/* NOTE: UDP socket lookups traverse a different code path when there
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* are > 10 sockets in a group.
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*/
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fprintf(stderr, "---- UDP IPv4 created before IPv6 (large) ----\n");
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build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 16);
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build_rcv_fd(AF_INET6, SOCK_DGRAM, &(rcv_fds[16]), 16);
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test(rcv_fds, 32, SOCK_DGRAM);
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for (i = 0; i < 32; ++i)
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close(rcv_fds[i]);
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fprintf(stderr, "---- UDP IPv6 created before IPv4 (large) ----\n");
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build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds, 16);
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build_rcv_fd(AF_INET, SOCK_DGRAM, &(rcv_fds[16]), 16);
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test(rcv_fds, 32, SOCK_DGRAM);
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for (i = 0; i < 32; ++i)
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close(rcv_fds[i]);
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fprintf(stderr, "---- TCP IPv4 created before IPv6 ----\n");
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build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds, 5);
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build_rcv_fd(AF_INET6, SOCK_STREAM, &(rcv_fds[5]), 5);
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test(rcv_fds, 10, SOCK_STREAM);
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for (i = 0; i < 10; ++i)
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close(rcv_fds[i]);
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fprintf(stderr, "---- TCP IPv6 created before IPv4 ----\n");
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build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds, 5);
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build_rcv_fd(AF_INET, SOCK_STREAM, &(rcv_fds[5]), 5);
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test(rcv_fds, 10, SOCK_STREAM);
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for (i = 0; i < 10; ++i)
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close(rcv_fds[i]);
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fprintf(stderr, "SUCCESS\n");
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return 0;
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}
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