diff options
Diffstat (limited to 'tools/testing/selftests/net/reuseport_addr_any.c')
| -rw-r--r-- | tools/testing/selftests/net/reuseport_addr_any.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/tools/testing/selftests/net/reuseport_addr_any.c b/tools/testing/selftests/net/reuseport_addr_any.c new file mode 100644 index 000000000000..f5e01d989519 --- /dev/null +++ b/tools/testing/selftests/net/reuseport_addr_any.c @@ -0,0 +1,264 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* Test that sockets listening on a specific address are preferred + * over sockets listening on addr_any. + */ + +#define _GNU_SOURCE + +#include <arpa/inet.h> +#include <errno.h> +#include <error.h> +#include <linux/in.h> +#include <linux/unistd.h> +#include <stdbool.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 char *IP4_ADDR = "127.0.0.1"; +static const char *IP6_ADDR = "::1"; +static const char *IP4_MAPPED6 = "::ffff:127.0.0.1"; + +static const int PORT = 8888; + +static void build_rcv_fd(int family, int proto, int *rcv_fds, int count, + const char *addr_str) +{ + struct sockaddr_in addr4 = {0}; + struct sockaddr_in6 addr6 = {0}; + struct sockaddr *addr; + int opt, i, sz; + + memset(&addr, 0, sizeof(addr)); + + switch (family) { + case AF_INET: + addr4.sin_family = family; + if (!addr_str) + addr4.sin_addr.s_addr = htonl(INADDR_ANY); + else if (!inet_pton(family, addr_str, &addr4.sin_addr.s_addr)) + error(1, errno, "inet_pton failed: %s", addr_str); + addr4.sin_port = htons(PORT); + sz = sizeof(addr4); + addr = (struct sockaddr *)&addr4; + break; + case AF_INET6: + addr6.sin6_family = AF_INET6; + if (!addr_str) + addr6.sin6_addr = in6addr_any; + else if (!inet_pton(family, addr_str, &addr6.sin6_addr)) + error(1, errno, "inet_pton failed: %s", addr_str); + addr6.sin6_port = htons(PORT); + sz = sizeof(addr6); + addr = (struct sockaddr *)&addr6; + 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], addr, sz)) + 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 int connect_and_send(int family, int proto) +{ + struct sockaddr_in saddr4 = {0}; + struct sockaddr_in daddr4 = {0}; + struct sockaddr_in6 saddr6 = {0}; + struct sockaddr_in6 daddr6 = {0}; + struct sockaddr *saddr, *daddr; + int fd, sz; + + switch (family) { + case AF_INET: + saddr4.sin_family = AF_INET; + saddr4.sin_addr.s_addr = htonl(INADDR_ANY); + saddr4.sin_port = 0; + + daddr4.sin_family = AF_INET; + if (!inet_pton(family, IP4_ADDR, &daddr4.sin_addr.s_addr)) + error(1, errno, "inet_pton failed: %s", IP4_ADDR); + daddr4.sin_port = htons(PORT); + + sz = sizeof(saddr4); + saddr = (struct sockaddr *)&saddr4; + daddr = (struct sockaddr *)&daddr4; + break; + case AF_INET6: + saddr6.sin6_family = AF_INET6; + saddr6.sin6_addr = in6addr_any; + + daddr6.sin6_family = AF_INET6; + if (!inet_pton(family, IP6_ADDR, &daddr6.sin6_addr)) + error(1, errno, "inet_pton failed: %s", IP6_ADDR); + daddr6.sin6_port = htons(PORT); + + sz = sizeof(saddr6); + saddr = (struct sockaddr *)&saddr6; + daddr = (struct sockaddr *)&daddr6; + break; + default: + error(1, 0, "Unsupported family %d", family); + } + + fd = socket(family, proto, 0); + if (fd < 0) + error(1, errno, "failed to create send socket"); + + if (bind(fd, saddr, sz)) + error(1, errno, "failed to bind send socket"); + + if (connect(fd, daddr, sz)) + error(1, errno, "failed to connect send socket"); + + if (send(fd, "a", 1, 0) < 0) + error(1, errno, "failed to send message"); + + return 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, 3); + 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 family, int proto, int fd) +{ + struct epoll_event ev; + int epfd, i, send_fd, recv_fd; + + 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_fd = connect_and_send(family, proto); + + recv_fd = receive_once(epfd, proto); + if (recv_fd != fd) + error(1, 0, "received on an unexpected socket"); + + close(send_fd); + close(epfd); +} + +int main(void) +{ + /* Below we test that a socket listening on a specific address + * is always selected in preference over a socket listening + * on addr_any. Bugs where this is not the case often result + * in sockets created first or last to get picked. So below + * we make sure that there are always addr_any sockets created + * before and after a specific socket is created. + */ + int rcv_fds[10], i; + + fprintf(stderr, "---- UDP IPv4 ----\n"); + build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 2, 2, NULL); + build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds + 4, 1, IP4_ADDR); + build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds + 5, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 7, 2, NULL); + test(rcv_fds, 9, AF_INET, SOCK_DGRAM, rcv_fds[4]); + for (i = 0; i < 9; ++i) + close(rcv_fds[i]); + + fprintf(stderr, "---- UDP IPv6 ----\n"); + build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 2, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 4, 1, IP6_ADDR); + build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds + 5, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 7, 2, NULL); + test(rcv_fds, 9, AF_INET6, SOCK_DGRAM, rcv_fds[4]); + for (i = 0; i < 9; ++i) + close(rcv_fds[i]); + + fprintf(stderr, "---- UDP IPv4 mapped to IPv6 ----\n"); + build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 2, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 4, 1, IP4_MAPPED6); + build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds + 5, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 7, 2, NULL); + test(rcv_fds, 9, AF_INET, SOCK_DGRAM, rcv_fds[4]); + for (i = 0; i < 9; ++i) + close(rcv_fds[i]); + + fprintf(stderr, "---- TCP IPv4 ----\n"); + build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 2, 2, NULL); + build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds + 4, 1, IP4_ADDR); + build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds + 5, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 7, 2, NULL); + test(rcv_fds, 9, AF_INET, SOCK_STREAM, rcv_fds[4]); + for (i = 0; i < 9; ++i) + close(rcv_fds[i]); + + fprintf(stderr, "---- TCP IPv6 ----\n"); + build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 2, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 4, 1, IP6_ADDR); + build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds + 5, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 7, 2, NULL); + test(rcv_fds, 9, AF_INET6, SOCK_STREAM, rcv_fds[4]); + for (i = 0; i < 9; ++i) + close(rcv_fds[i]); + + fprintf(stderr, "---- TCP IPv4 mapped to IPv6 ----\n"); + build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 2, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 4, 1, IP4_MAPPED6); + build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds + 5, 2, NULL); + build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 7, 2, NULL); + test(rcv_fds, 9, AF_INET, SOCK_STREAM, rcv_fds[4]); + for (i = 0; i < 9; ++i) + close(rcv_fds[i]); + + fprintf(stderr, "SUCCESS\n"); + return 0; +} |