diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/bpf/prog_tests/sk_lookup.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/sk_lookup.c')
-rw-r--r-- | tools/testing/selftests/bpf/prog_tests/sk_lookup.c | 1383 |
1 files changed, 1383 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c new file mode 100644 index 000000000..b4c9f4a96 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c @@ -0,0 +1,1383 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause +// Copyright (c) 2020 Cloudflare +/* + * Test BPF attach point for INET socket lookup (BPF_SK_LOOKUP). + * + * Tests exercise: + * - attaching/detaching/querying programs to BPF_SK_LOOKUP hook, + * - redirecting socket lookup to a socket selected by BPF program, + * - failing a socket lookup on BPF program's request, + * - error scenarios for selecting a socket from BPF program, + * - accessing BPF program context, + * - attaching and running multiple BPF programs. + * + * Tests run in a dedicated network namespace. + */ + +#define _GNU_SOURCE +#include <arpa/inet.h> +#include <assert.h> +#include <errno.h> +#include <error.h> +#include <fcntl.h> +#include <sched.h> +#include <stdio.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> + +#include <bpf/libbpf.h> +#include <bpf/bpf.h> + +#include "test_progs.h" +#include "bpf_rlimit.h" +#include "bpf_util.h" +#include "cgroup_helpers.h" +#include "network_helpers.h" +#include "testing_helpers.h" +#include "test_sk_lookup.skel.h" + +/* External (address, port) pairs the client sends packets to. */ +#define EXT_IP4 "127.0.0.1" +#define EXT_IP6 "fd00::1" +#define EXT_PORT 7007 + +/* Internal (address, port) pairs the server listens/receives at. */ +#define INT_IP4 "127.0.0.2" +#define INT_IP4_V6 "::ffff:127.0.0.2" +#define INT_IP6 "fd00::2" +#define INT_PORT 8008 + +#define IO_TIMEOUT_SEC 3 + +enum server { + SERVER_A = 0, + SERVER_B = 1, + MAX_SERVERS, +}; + +enum { + PROG1 = 0, + PROG2, +}; + +struct inet_addr { + const char *ip; + unsigned short port; +}; + +struct test { + const char *desc; + struct bpf_program *lookup_prog; + struct bpf_program *reuseport_prog; + struct bpf_map *sock_map; + int sotype; + struct inet_addr connect_to; + struct inet_addr listen_at; + enum server accept_on; + bool reuseport_has_conns; /* Add a connected socket to reuseport group */ +}; + +static __u32 duration; /* for CHECK macro */ + +static bool is_ipv6(const char *ip) +{ + return !!strchr(ip, ':'); +} + +static int attach_reuseport(int sock_fd, struct bpf_program *reuseport_prog) +{ + int err, prog_fd; + + prog_fd = bpf_program__fd(reuseport_prog); + if (prog_fd < 0) { + errno = -prog_fd; + return -1; + } + + err = setsockopt(sock_fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF, + &prog_fd, sizeof(prog_fd)); + if (err) + return -1; + + return 0; +} + +static socklen_t inetaddr_len(const struct sockaddr_storage *addr) +{ + return (addr->ss_family == AF_INET ? sizeof(struct sockaddr_in) : + addr->ss_family == AF_INET6 ? sizeof(struct sockaddr_in6) : 0); +} + +static int make_socket(int sotype, const char *ip, int port, + struct sockaddr_storage *addr) +{ + struct timeval timeo = { .tv_sec = IO_TIMEOUT_SEC }; + int err, family, fd; + + family = is_ipv6(ip) ? AF_INET6 : AF_INET; + err = make_sockaddr(family, ip, port, addr, NULL); + if (CHECK(err, "make_address", "failed\n")) + return -1; + + fd = socket(addr->ss_family, sotype, 0); + if (CHECK(fd < 0, "socket", "failed\n")) { + log_err("failed to make socket"); + return -1; + } + + err = setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeo, sizeof(timeo)); + if (CHECK(err, "setsockopt(SO_SNDTIMEO)", "failed\n")) { + log_err("failed to set SNDTIMEO"); + close(fd); + return -1; + } + + err = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeo, sizeof(timeo)); + if (CHECK(err, "setsockopt(SO_RCVTIMEO)", "failed\n")) { + log_err("failed to set RCVTIMEO"); + close(fd); + return -1; + } + + return fd; +} + +static int make_server(int sotype, const char *ip, int port, + struct bpf_program *reuseport_prog) +{ + struct sockaddr_storage addr = {0}; + const int one = 1; + int err, fd = -1; + + fd = make_socket(sotype, ip, port, &addr); + if (fd < 0) + return -1; + + /* Enabled for UDPv6 sockets for IPv4-mapped IPv6 to work. */ + if (sotype == SOCK_DGRAM) { + err = setsockopt(fd, SOL_IP, IP_RECVORIGDSTADDR, &one, + sizeof(one)); + if (CHECK(err, "setsockopt(IP_RECVORIGDSTADDR)", "failed\n")) { + log_err("failed to enable IP_RECVORIGDSTADDR"); + goto fail; + } + } + + if (sotype == SOCK_DGRAM && addr.ss_family == AF_INET6) { + err = setsockopt(fd, SOL_IPV6, IPV6_RECVORIGDSTADDR, &one, + sizeof(one)); + if (CHECK(err, "setsockopt(IPV6_RECVORIGDSTADDR)", "failed\n")) { + log_err("failed to enable IPV6_RECVORIGDSTADDR"); + goto fail; + } + } + + if (sotype == SOCK_STREAM) { + err = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, + sizeof(one)); + if (CHECK(err, "setsockopt(SO_REUSEADDR)", "failed\n")) { + log_err("failed to enable SO_REUSEADDR"); + goto fail; + } + } + + if (reuseport_prog) { + err = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &one, + sizeof(one)); + if (CHECK(err, "setsockopt(SO_REUSEPORT)", "failed\n")) { + log_err("failed to enable SO_REUSEPORT"); + goto fail; + } + } + + err = bind(fd, (void *)&addr, inetaddr_len(&addr)); + if (CHECK(err, "bind", "failed\n")) { + log_err("failed to bind listen socket"); + goto fail; + } + + if (sotype == SOCK_STREAM) { + err = listen(fd, SOMAXCONN); + if (CHECK(err, "make_server", "listen")) { + log_err("failed to listen on port %d", port); + goto fail; + } + } + + /* Late attach reuseport prog so we can have one init path */ + if (reuseport_prog) { + err = attach_reuseport(fd, reuseport_prog); + if (CHECK(err, "attach_reuseport", "failed\n")) { + log_err("failed to attach reuseport prog"); + goto fail; + } + } + + return fd; +fail: + close(fd); + return -1; +} + +static int make_client(int sotype, const char *ip, int port) +{ + struct sockaddr_storage addr = {0}; + int err, fd; + + fd = make_socket(sotype, ip, port, &addr); + if (fd < 0) + return -1; + + err = connect(fd, (void *)&addr, inetaddr_len(&addr)); + if (CHECK(err, "make_client", "connect")) { + log_err("failed to connect client socket"); + goto fail; + } + + return fd; +fail: + close(fd); + return -1; +} + +static __u64 socket_cookie(int fd) +{ + __u64 cookie; + socklen_t cookie_len = sizeof(cookie); + + if (CHECK(getsockopt(fd, SOL_SOCKET, SO_COOKIE, &cookie, &cookie_len) < 0, + "getsockopt(SO_COOKIE)", "%s\n", strerror(errno))) + return 0; + return cookie; +} + +static int fill_sk_lookup_ctx(struct bpf_sk_lookup *ctx, const char *local_ip, __u16 local_port, + const char *remote_ip, __u16 remote_port) +{ + void *local, *remote; + int err; + + memset(ctx, 0, sizeof(*ctx)); + ctx->local_port = local_port; + ctx->remote_port = htons(remote_port); + + if (is_ipv6(local_ip)) { + ctx->family = AF_INET6; + local = &ctx->local_ip6[0]; + remote = &ctx->remote_ip6[0]; + } else { + ctx->family = AF_INET; + local = &ctx->local_ip4; + remote = &ctx->remote_ip4; + } + + err = inet_pton(ctx->family, local_ip, local); + if (CHECK(err != 1, "inet_pton", "local_ip failed\n")) + return 1; + + err = inet_pton(ctx->family, remote_ip, remote); + if (CHECK(err != 1, "inet_pton", "remote_ip failed\n")) + return 1; + + return 0; +} + +static int send_byte(int fd) +{ + ssize_t n; + + errno = 0; + n = send(fd, "a", 1, 0); + if (CHECK(n <= 0, "send_byte", "send")) { + log_err("failed/partial send"); + return -1; + } + return 0; +} + +static int recv_byte(int fd) +{ + char buf[1]; + ssize_t n; + + n = recv(fd, buf, sizeof(buf), 0); + if (CHECK(n <= 0, "recv_byte", "recv")) { + log_err("failed/partial recv"); + return -1; + } + return 0; +} + +static int tcp_recv_send(int server_fd) +{ + char buf[1]; + int ret, fd; + ssize_t n; + + fd = accept(server_fd, NULL, NULL); + if (CHECK(fd < 0, "accept", "failed\n")) { + log_err("failed to accept"); + return -1; + } + + n = recv(fd, buf, sizeof(buf), 0); + if (CHECK(n <= 0, "recv", "failed\n")) { + log_err("failed/partial recv"); + ret = -1; + goto close; + } + + n = send(fd, buf, n, 0); + if (CHECK(n <= 0, "send", "failed\n")) { + log_err("failed/partial send"); + ret = -1; + goto close; + } + + ret = 0; +close: + close(fd); + return ret; +} + +static void v4_to_v6(struct sockaddr_storage *ss) +{ + struct sockaddr_in6 *v6 = (struct sockaddr_in6 *)ss; + struct sockaddr_in v4 = *(struct sockaddr_in *)ss; + + v6->sin6_family = AF_INET6; + v6->sin6_port = v4.sin_port; + v6->sin6_addr.s6_addr[10] = 0xff; + v6->sin6_addr.s6_addr[11] = 0xff; + memcpy(&v6->sin6_addr.s6_addr[12], &v4.sin_addr.s_addr, 4); + memset(&v6->sin6_addr.s6_addr[0], 0, 10); +} + +static int udp_recv_send(int server_fd) +{ + char cmsg_buf[CMSG_SPACE(sizeof(struct sockaddr_storage))]; + struct sockaddr_storage _src_addr = { 0 }; + struct sockaddr_storage *src_addr = &_src_addr; + struct sockaddr_storage *dst_addr = NULL; + struct msghdr msg = { 0 }; + struct iovec iov = { 0 }; + struct cmsghdr *cm; + char buf[1]; + int ret, fd; + ssize_t n; + + iov.iov_base = buf; + iov.iov_len = sizeof(buf); + + msg.msg_name = src_addr; + msg.msg_namelen = sizeof(*src_addr); + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_control = cmsg_buf; + msg.msg_controllen = sizeof(cmsg_buf); + + errno = 0; + n = recvmsg(server_fd, &msg, 0); + if (CHECK(n <= 0, "recvmsg", "failed\n")) { + log_err("failed to receive"); + return -1; + } + if (CHECK(msg.msg_flags & MSG_CTRUNC, "recvmsg", "truncated cmsg\n")) + return -1; + + for (cm = CMSG_FIRSTHDR(&msg); cm; cm = CMSG_NXTHDR(&msg, cm)) { + if ((cm->cmsg_level == SOL_IP && + cm->cmsg_type == IP_ORIGDSTADDR) || + (cm->cmsg_level == SOL_IPV6 && + cm->cmsg_type == IPV6_ORIGDSTADDR)) { + dst_addr = (struct sockaddr_storage *)CMSG_DATA(cm); + break; + } + log_err("warning: ignored cmsg at level %d type %d", + cm->cmsg_level, cm->cmsg_type); + } + if (CHECK(!dst_addr, "recvmsg", "missing ORIGDSTADDR\n")) + return -1; + + /* Server socket bound to IPv4-mapped IPv6 address */ + if (src_addr->ss_family == AF_INET6 && + dst_addr->ss_family == AF_INET) { + v4_to_v6(dst_addr); + } + + /* Reply from original destination address. */ + fd = socket(dst_addr->ss_family, SOCK_DGRAM, 0); + if (CHECK(fd < 0, "socket", "failed\n")) { + log_err("failed to create tx socket"); + return -1; + } + + ret = bind(fd, (struct sockaddr *)dst_addr, sizeof(*dst_addr)); + if (CHECK(ret, "bind", "failed\n")) { + log_err("failed to bind tx socket"); + goto out; + } + + msg.msg_control = NULL; + msg.msg_controllen = 0; + n = sendmsg(fd, &msg, 0); + if (CHECK(n <= 0, "sendmsg", "failed\n")) { + log_err("failed to send echo reply"); + ret = -1; + goto out; + } + + ret = 0; +out: + close(fd); + return ret; +} + +static int tcp_echo_test(int client_fd, int server_fd) +{ + int err; + + err = send_byte(client_fd); + if (err) + return -1; + err = tcp_recv_send(server_fd); + if (err) + return -1; + err = recv_byte(client_fd); + if (err) + return -1; + + return 0; +} + +static int udp_echo_test(int client_fd, int server_fd) +{ + int err; + + err = send_byte(client_fd); + if (err) + return -1; + err = udp_recv_send(server_fd); + if (err) + return -1; + err = recv_byte(client_fd); + if (err) + return -1; + + return 0; +} + +static struct bpf_link *attach_lookup_prog(struct bpf_program *prog) +{ + struct bpf_link *link; + int net_fd; + + net_fd = open("/proc/self/ns/net", O_RDONLY); + if (CHECK(net_fd < 0, "open", "failed\n")) { + log_err("failed to open /proc/self/ns/net"); + return NULL; + } + + link = bpf_program__attach_netns(prog, net_fd); + if (CHECK(IS_ERR(link), "bpf_program__attach_netns", "failed\n")) { + errno = -PTR_ERR(link); + log_err("failed to attach program '%s' to netns", + bpf_program__name(prog)); + link = NULL; + } + + close(net_fd); + return link; +} + +static int update_lookup_map(struct bpf_map *map, int index, int sock_fd) +{ + int err, map_fd; + uint64_t value; + + map_fd = bpf_map__fd(map); + if (CHECK(map_fd < 0, "bpf_map__fd", "failed\n")) { + errno = -map_fd; + log_err("failed to get map FD"); + return -1; + } + + value = (uint64_t)sock_fd; + err = bpf_map_update_elem(map_fd, &index, &value, BPF_NOEXIST); + if (CHECK(err, "bpf_map_update_elem", "failed\n")) { + log_err("failed to update redir_map @ %d", index); + return -1; + } + + return 0; +} + +static void query_lookup_prog(struct test_sk_lookup *skel) +{ + struct bpf_link *link[3] = {}; + struct bpf_link_info info; + __u32 attach_flags = 0; + __u32 prog_ids[3] = {}; + __u32 prog_cnt = 3; + __u32 prog_id; + int net_fd; + int err; + + net_fd = open("/proc/self/ns/net", O_RDONLY); + if (CHECK(net_fd < 0, "open", "failed\n")) { + log_err("failed to open /proc/self/ns/net"); + return; + } + + link[0] = attach_lookup_prog(skel->progs.lookup_pass); + if (!link[0]) + goto close; + link[1] = attach_lookup_prog(skel->progs.lookup_pass); + if (!link[1]) + goto detach; + link[2] = attach_lookup_prog(skel->progs.lookup_drop); + if (!link[2]) + goto detach; + + err = bpf_prog_query(net_fd, BPF_SK_LOOKUP, 0 /* query flags */, + &attach_flags, prog_ids, &prog_cnt); + if (CHECK(err, "bpf_prog_query", "failed\n")) { + log_err("failed to query lookup prog"); + goto detach; + } + + errno = 0; + if (CHECK(attach_flags != 0, "bpf_prog_query", + "wrong attach_flags on query: %u", attach_flags)) + goto detach; + if (CHECK(prog_cnt != 3, "bpf_prog_query", + "wrong program count on query: %u", prog_cnt)) + goto detach; + prog_id = link_info_prog_id(link[0], &info); + CHECK(prog_ids[0] != prog_id, "bpf_prog_query", + "invalid program #0 id on query: %u != %u\n", + prog_ids[0], prog_id); + CHECK(info.netns.netns_ino == 0, "netns_ino", + "unexpected netns_ino: %u\n", info.netns.netns_ino); + prog_id = link_info_prog_id(link[1], &info); + CHECK(prog_ids[1] != prog_id, "bpf_prog_query", + "invalid program #1 id on query: %u != %u\n", + prog_ids[1], prog_id); + CHECK(info.netns.netns_ino == 0, "netns_ino", + "unexpected netns_ino: %u\n", info.netns.netns_ino); + prog_id = link_info_prog_id(link[2], &info); + CHECK(prog_ids[2] != prog_id, "bpf_prog_query", + "invalid program #2 id on query: %u != %u\n", + prog_ids[2], prog_id); + CHECK(info.netns.netns_ino == 0, "netns_ino", + "unexpected netns_ino: %u\n", info.netns.netns_ino); + + err = bpf_link__detach(link[0]); + if (CHECK(err, "link_detach", "failed %d\n", err)) + goto detach; + + /* prog id is still there, but netns_ino is zeroed out */ + prog_id = link_info_prog_id(link[0], &info); + CHECK(prog_ids[0] != prog_id, "bpf_prog_query", + "invalid program #0 id on query: %u != %u\n", + prog_ids[0], prog_id); + CHECK(info.netns.netns_ino != 0, "netns_ino", + "unexpected netns_ino: %u\n", info.netns.netns_ino); + +detach: + if (link[2]) + bpf_link__destroy(link[2]); + if (link[1]) + bpf_link__destroy(link[1]); + if (link[0]) + bpf_link__destroy(link[0]); +close: + close(net_fd); +} + +static void run_lookup_prog(const struct test *t) +{ + int server_fds[] = { [0 ... MAX_SERVERS - 1] = -1 }; + int client_fd, reuse_conn_fd = -1; + struct bpf_link *lookup_link; + int i, err; + + lookup_link = attach_lookup_prog(t->lookup_prog); + if (!lookup_link) + return; + + for (i = 0; i < ARRAY_SIZE(server_fds); i++) { + server_fds[i] = make_server(t->sotype, t->listen_at.ip, + t->listen_at.port, + t->reuseport_prog); + if (server_fds[i] < 0) + goto close; + + err = update_lookup_map(t->sock_map, i, server_fds[i]); + if (err) + goto close; + + /* want just one server for non-reuseport test */ + if (!t->reuseport_prog) + break; + } + + /* Regular UDP socket lookup with reuseport behaves + * differently when reuseport group contains connected + * sockets. Check that adding a connected UDP socket to the + * reuseport group does not affect how reuseport works with + * BPF socket lookup. + */ + if (t->reuseport_has_conns) { + struct sockaddr_storage addr = {}; + socklen_t len = sizeof(addr); + + /* Add an extra socket to reuseport group */ + reuse_conn_fd = make_server(t->sotype, t->listen_at.ip, + t->listen_at.port, + t->reuseport_prog); + if (reuse_conn_fd < 0) + goto close; + + /* Connect the extra socket to itself */ + err = getsockname(reuse_conn_fd, (void *)&addr, &len); + if (CHECK(err, "getsockname", "errno %d\n", errno)) + goto close; + err = connect(reuse_conn_fd, (void *)&addr, len); + if (CHECK(err, "connect", "errno %d\n", errno)) + goto close; + } + + client_fd = make_client(t->sotype, t->connect_to.ip, t->connect_to.port); + if (client_fd < 0) + goto close; + + if (t->sotype == SOCK_STREAM) + tcp_echo_test(client_fd, server_fds[t->accept_on]); + else + udp_echo_test(client_fd, server_fds[t->accept_on]); + + close(client_fd); +close: + if (reuse_conn_fd != -1) + close(reuse_conn_fd); + for (i = 0; i < ARRAY_SIZE(server_fds); i++) { + if (server_fds[i] != -1) + close(server_fds[i]); + } + bpf_link__destroy(lookup_link); +} + +static void test_redirect_lookup(struct test_sk_lookup *skel) +{ + const struct test tests[] = { + { + .desc = "TCP IPv4 redir port", + .lookup_prog = skel->progs.redir_port, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { EXT_IP4, INT_PORT }, + }, + { + .desc = "TCP IPv4 redir addr", + .lookup_prog = skel->progs.redir_ip4, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { INT_IP4, EXT_PORT }, + }, + { + .desc = "TCP IPv4 redir with reuseport", + .lookup_prog = skel->progs.select_sock_a, + .reuseport_prog = skel->progs.select_sock_b, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { INT_IP4, INT_PORT }, + .accept_on = SERVER_B, + }, + { + .desc = "TCP IPv4 redir skip reuseport", + .lookup_prog = skel->progs.select_sock_a_no_reuseport, + .reuseport_prog = skel->progs.select_sock_b, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { INT_IP4, INT_PORT }, + .accept_on = SERVER_A, + }, + { + .desc = "TCP IPv6 redir port", + .lookup_prog = skel->progs.redir_port, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { EXT_IP6, INT_PORT }, + }, + { + .desc = "TCP IPv6 redir addr", + .lookup_prog = skel->progs.redir_ip6, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { INT_IP6, EXT_PORT }, + }, + { + .desc = "TCP IPv4->IPv6 redir port", + .lookup_prog = skel->progs.redir_port, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { INT_IP4_V6, INT_PORT }, + }, + { + .desc = "TCP IPv6 redir with reuseport", + .lookup_prog = skel->progs.select_sock_a, + .reuseport_prog = skel->progs.select_sock_b, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { INT_IP6, INT_PORT }, + .accept_on = SERVER_B, + }, + { + .desc = "TCP IPv6 redir skip reuseport", + .lookup_prog = skel->progs.select_sock_a_no_reuseport, + .reuseport_prog = skel->progs.select_sock_b, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { INT_IP6, INT_PORT }, + .accept_on = SERVER_A, + }, + { + .desc = "UDP IPv4 redir port", + .lookup_prog = skel->progs.redir_port, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { EXT_IP4, INT_PORT }, + }, + { + .desc = "UDP IPv4 redir addr", + .lookup_prog = skel->progs.redir_ip4, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { INT_IP4, EXT_PORT }, + }, + { + .desc = "UDP IPv4 redir with reuseport", + .lookup_prog = skel->progs.select_sock_a, + .reuseport_prog = skel->progs.select_sock_b, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { INT_IP4, INT_PORT }, + .accept_on = SERVER_B, + }, + { + .desc = "UDP IPv4 redir and reuseport with conns", + .lookup_prog = skel->progs.select_sock_a, + .reuseport_prog = skel->progs.select_sock_b, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { INT_IP4, INT_PORT }, + .accept_on = SERVER_B, + .reuseport_has_conns = true, + }, + { + .desc = "UDP IPv4 redir skip reuseport", + .lookup_prog = skel->progs.select_sock_a_no_reuseport, + .reuseport_prog = skel->progs.select_sock_b, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { INT_IP4, INT_PORT }, + .accept_on = SERVER_A, + }, + { + .desc = "UDP IPv6 redir port", + .lookup_prog = skel->progs.redir_port, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { EXT_IP6, INT_PORT }, + }, + { + .desc = "UDP IPv6 redir addr", + .lookup_prog = skel->progs.redir_ip6, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { INT_IP6, EXT_PORT }, + }, + { + .desc = "UDP IPv4->IPv6 redir port", + .lookup_prog = skel->progs.redir_port, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_DGRAM, + .listen_at = { INT_IP4_V6, INT_PORT }, + .connect_to = { EXT_IP4, EXT_PORT }, + }, + { + .desc = "UDP IPv6 redir and reuseport", + .lookup_prog = skel->progs.select_sock_a, + .reuseport_prog = skel->progs.select_sock_b, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { INT_IP6, INT_PORT }, + .accept_on = SERVER_B, + }, + { + .desc = "UDP IPv6 redir and reuseport with conns", + .lookup_prog = skel->progs.select_sock_a, + .reuseport_prog = skel->progs.select_sock_b, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { INT_IP6, INT_PORT }, + .accept_on = SERVER_B, + .reuseport_has_conns = true, + }, + { + .desc = "UDP IPv6 redir skip reuseport", + .lookup_prog = skel->progs.select_sock_a_no_reuseport, + .reuseport_prog = skel->progs.select_sock_b, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { INT_IP6, INT_PORT }, + .accept_on = SERVER_A, + }, + }; + const struct test *t; + + for (t = tests; t < tests + ARRAY_SIZE(tests); t++) { + if (test__start_subtest(t->desc)) + run_lookup_prog(t); + } +} + +static void drop_on_lookup(const struct test *t) +{ + struct sockaddr_storage dst = {}; + int client_fd, server_fd, err; + struct bpf_link *lookup_link; + ssize_t n; + + lookup_link = attach_lookup_prog(t->lookup_prog); + if (!lookup_link) + return; + + server_fd = make_server(t->sotype, t->listen_at.ip, t->listen_at.port, + t->reuseport_prog); + if (server_fd < 0) + goto detach; + + client_fd = make_socket(t->sotype, t->connect_to.ip, + t->connect_to.port, &dst); + if (client_fd < 0) + goto close_srv; + + err = connect(client_fd, (void *)&dst, inetaddr_len(&dst)); + if (t->sotype == SOCK_DGRAM) { + err = send_byte(client_fd); + if (err) + goto close_all; + + /* Read out asynchronous error */ + n = recv(client_fd, NULL, 0, 0); + err = n == -1; + } + if (CHECK(!err || errno != ECONNREFUSED, "connect", + "unexpected success or error\n")) + log_err("expected ECONNREFUSED on connect"); + +close_all: + close(client_fd); +close_srv: + close(server_fd); +detach: + bpf_link__destroy(lookup_link); +} + +static void test_drop_on_lookup(struct test_sk_lookup *skel) +{ + const struct test tests[] = { + { + .desc = "TCP IPv4 drop on lookup", + .lookup_prog = skel->progs.lookup_drop, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { EXT_IP4, EXT_PORT }, + }, + { + .desc = "TCP IPv6 drop on lookup", + .lookup_prog = skel->progs.lookup_drop, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { EXT_IP6, EXT_PORT }, + }, + { + .desc = "UDP IPv4 drop on lookup", + .lookup_prog = skel->progs.lookup_drop, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { EXT_IP4, EXT_PORT }, + }, + { + .desc = "UDP IPv6 drop on lookup", + .lookup_prog = skel->progs.lookup_drop, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { EXT_IP6, INT_PORT }, + }, + }; + const struct test *t; + + for (t = tests; t < tests + ARRAY_SIZE(tests); t++) { + if (test__start_subtest(t->desc)) + drop_on_lookup(t); + } +} + +static void drop_on_reuseport(const struct test *t) +{ + struct sockaddr_storage dst = { 0 }; + int client, server1, server2, err; + struct bpf_link *lookup_link; + ssize_t n; + + lookup_link = attach_lookup_prog(t->lookup_prog); + if (!lookup_link) + return; + + server1 = make_server(t->sotype, t->listen_at.ip, t->listen_at.port, + t->reuseport_prog); + if (server1 < 0) + goto detach; + + err = update_lookup_map(t->sock_map, SERVER_A, server1); + if (err) + goto detach; + + /* second server on destination address we should never reach */ + server2 = make_server(t->sotype, t->connect_to.ip, t->connect_to.port, + NULL /* reuseport prog */); + if (server2 < 0) + goto close_srv1; + + client = make_socket(t->sotype, t->connect_to.ip, + t->connect_to.port, &dst); + if (client < 0) + goto close_srv2; + + err = connect(client, (void *)&dst, inetaddr_len(&dst)); + if (t->sotype == SOCK_DGRAM) { + err = send_byte(client); + if (err) + goto close_all; + + /* Read out asynchronous error */ + n = recv(client, NULL, 0, 0); + err = n == -1; + } + if (CHECK(!err || errno != ECONNREFUSED, "connect", + "unexpected success or error\n")) + log_err("expected ECONNREFUSED on connect"); + +close_all: + close(client); +close_srv2: + close(server2); +close_srv1: + close(server1); +detach: + bpf_link__destroy(lookup_link); +} + +static void test_drop_on_reuseport(struct test_sk_lookup *skel) +{ + const struct test tests[] = { + { + .desc = "TCP IPv4 drop on reuseport", + .lookup_prog = skel->progs.select_sock_a, + .reuseport_prog = skel->progs.reuseport_drop, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { INT_IP4, INT_PORT }, + }, + { + .desc = "TCP IPv6 drop on reuseport", + .lookup_prog = skel->progs.select_sock_a, + .reuseport_prog = skel->progs.reuseport_drop, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { INT_IP6, INT_PORT }, + }, + { + .desc = "UDP IPv4 drop on reuseport", + .lookup_prog = skel->progs.select_sock_a, + .reuseport_prog = skel->progs.reuseport_drop, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { INT_IP4, INT_PORT }, + }, + { + .desc = "TCP IPv6 drop on reuseport", + .lookup_prog = skel->progs.select_sock_a, + .reuseport_prog = skel->progs.reuseport_drop, + .sock_map = skel->maps.redir_map, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { INT_IP6, INT_PORT }, + }, + }; + const struct test *t; + + for (t = tests; t < tests + ARRAY_SIZE(tests); t++) { + if (test__start_subtest(t->desc)) + drop_on_reuseport(t); + } +} + +static void run_sk_assign(struct test_sk_lookup *skel, + struct bpf_program *lookup_prog, + const char *remote_ip, const char *local_ip) +{ + int server_fds[] = { [0 ... MAX_SERVERS - 1] = -1 }; + struct bpf_sk_lookup ctx; + __u64 server_cookie; + int i, err; + + DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts, + .ctx_in = &ctx, + .ctx_size_in = sizeof(ctx), + .ctx_out = &ctx, + .ctx_size_out = sizeof(ctx), + ); + + if (fill_sk_lookup_ctx(&ctx, local_ip, EXT_PORT, remote_ip, INT_PORT)) + return; + + ctx.protocol = IPPROTO_TCP; + + for (i = 0; i < ARRAY_SIZE(server_fds); i++) { + server_fds[i] = make_server(SOCK_STREAM, local_ip, 0, NULL); + if (server_fds[i] < 0) + goto close_servers; + + err = update_lookup_map(skel->maps.redir_map, i, + server_fds[i]); + if (err) + goto close_servers; + } + + server_cookie = socket_cookie(server_fds[SERVER_B]); + if (!server_cookie) + return; + + err = bpf_prog_test_run_opts(bpf_program__fd(lookup_prog), &opts); + if (CHECK(err, "test_run", "failed with error %d\n", errno)) + goto close_servers; + + if (CHECK(ctx.cookie == 0, "ctx.cookie", "no socket selected\n")) + goto close_servers; + + CHECK(ctx.cookie != server_cookie, "ctx.cookie", + "selected sk %llu instead of %llu\n", ctx.cookie, server_cookie); + +close_servers: + for (i = 0; i < ARRAY_SIZE(server_fds); i++) { + if (server_fds[i] != -1) + close(server_fds[i]); + } +} + +static void run_sk_assign_v4(struct test_sk_lookup *skel, + struct bpf_program *lookup_prog) +{ + run_sk_assign(skel, lookup_prog, INT_IP4, EXT_IP4); +} + +static void run_sk_assign_v6(struct test_sk_lookup *skel, + struct bpf_program *lookup_prog) +{ + run_sk_assign(skel, lookup_prog, INT_IP6, EXT_IP6); +} + +static void run_sk_assign_connected(struct test_sk_lookup *skel, + int sotype) +{ + int err, client_fd, connected_fd, server_fd; + struct bpf_link *lookup_link; + + server_fd = make_server(sotype, EXT_IP4, EXT_PORT, NULL); + if (server_fd < 0) + return; + + connected_fd = make_client(sotype, EXT_IP4, EXT_PORT); + if (connected_fd < 0) + goto out_close_server; + + /* Put a connected socket in redirect map */ + err = update_lookup_map(skel->maps.redir_map, SERVER_A, connected_fd); + if (err) + goto out_close_connected; + + lookup_link = attach_lookup_prog(skel->progs.sk_assign_esocknosupport); + if (!lookup_link) + goto out_close_connected; + + /* Try to redirect TCP SYN / UDP packet to a connected socket */ + client_fd = make_client(sotype, EXT_IP4, EXT_PORT); + if (client_fd < 0) + goto out_unlink_prog; + if (sotype == SOCK_DGRAM) { + send_byte(client_fd); + recv_byte(server_fd); + } + + close(client_fd); +out_unlink_prog: + bpf_link__destroy(lookup_link); +out_close_connected: + close(connected_fd); +out_close_server: + close(server_fd); +} + +static void test_sk_assign_helper(struct test_sk_lookup *skel) +{ + if (test__start_subtest("sk_assign returns EEXIST")) + run_sk_assign_v4(skel, skel->progs.sk_assign_eexist); + if (test__start_subtest("sk_assign honors F_REPLACE")) + run_sk_assign_v4(skel, skel->progs.sk_assign_replace_flag); + if (test__start_subtest("sk_assign accepts NULL socket")) + run_sk_assign_v4(skel, skel->progs.sk_assign_null); + if (test__start_subtest("access ctx->sk")) + run_sk_assign_v4(skel, skel->progs.access_ctx_sk); + if (test__start_subtest("narrow access to ctx v4")) + run_sk_assign_v4(skel, skel->progs.ctx_narrow_access); + if (test__start_subtest("narrow access to ctx v6")) + run_sk_assign_v6(skel, skel->progs.ctx_narrow_access); + if (test__start_subtest("sk_assign rejects TCP established")) + run_sk_assign_connected(skel, SOCK_STREAM); + if (test__start_subtest("sk_assign rejects UDP connected")) + run_sk_assign_connected(skel, SOCK_DGRAM); +} + +struct test_multi_prog { + const char *desc; + struct bpf_program *prog1; + struct bpf_program *prog2; + struct bpf_map *redir_map; + struct bpf_map *run_map; + int expect_errno; + struct inet_addr listen_at; +}; + +static void run_multi_prog_lookup(const struct test_multi_prog *t) +{ + struct sockaddr_storage dst = {}; + int map_fd, server_fd, client_fd; + struct bpf_link *link1, *link2; + int prog_idx, done, err; + + map_fd = bpf_map__fd(t->run_map); + + done = 0; + prog_idx = PROG1; + err = bpf_map_update_elem(map_fd, &prog_idx, &done, BPF_ANY); + if (CHECK(err, "bpf_map_update_elem", "failed\n")) + return; + prog_idx = PROG2; + err = bpf_map_update_elem(map_fd, &prog_idx, &done, BPF_ANY); + if (CHECK(err, "bpf_map_update_elem", "failed\n")) + return; + + link1 = attach_lookup_prog(t->prog1); + if (!link1) + return; + link2 = attach_lookup_prog(t->prog2); + if (!link2) + goto out_unlink1; + + server_fd = make_server(SOCK_STREAM, t->listen_at.ip, + t->listen_at.port, NULL); + if (server_fd < 0) + goto out_unlink2; + + err = update_lookup_map(t->redir_map, SERVER_A, server_fd); + if (err) + goto out_close_server; + + client_fd = make_socket(SOCK_STREAM, EXT_IP4, EXT_PORT, &dst); + if (client_fd < 0) + goto out_close_server; + + err = connect(client_fd, (void *)&dst, inetaddr_len(&dst)); + if (CHECK(err && !t->expect_errno, "connect", + "unexpected error %d\n", errno)) + goto out_close_client; + if (CHECK(err && t->expect_errno && errno != t->expect_errno, + "connect", "unexpected error %d\n", errno)) + goto out_close_client; + + done = 0; + prog_idx = PROG1; + err = bpf_map_lookup_elem(map_fd, &prog_idx, &done); + CHECK(err, "bpf_map_lookup_elem", "failed\n"); + CHECK(!done, "bpf_map_lookup_elem", "PROG1 !done\n"); + + done = 0; + prog_idx = PROG2; + err = bpf_map_lookup_elem(map_fd, &prog_idx, &done); + CHECK(err, "bpf_map_lookup_elem", "failed\n"); + CHECK(!done, "bpf_map_lookup_elem", "PROG2 !done\n"); + +out_close_client: + close(client_fd); +out_close_server: + close(server_fd); +out_unlink2: + bpf_link__destroy(link2); +out_unlink1: + bpf_link__destroy(link1); +} + +static void test_multi_prog_lookup(struct test_sk_lookup *skel) +{ + struct test_multi_prog tests[] = { + { + .desc = "multi prog - pass, pass", + .prog1 = skel->progs.multi_prog_pass1, + .prog2 = skel->progs.multi_prog_pass2, + .listen_at = { EXT_IP4, EXT_PORT }, + }, + { + .desc = "multi prog - drop, drop", + .prog1 = skel->progs.multi_prog_drop1, + .prog2 = skel->progs.multi_prog_drop2, + .listen_at = { EXT_IP4, EXT_PORT }, + .expect_errno = ECONNREFUSED, + }, + { + .desc = "multi prog - pass, drop", + .prog1 = skel->progs.multi_prog_pass1, + .prog2 = skel->progs.multi_prog_drop2, + .listen_at = { EXT_IP4, EXT_PORT }, + .expect_errno = ECONNREFUSED, + }, + { + .desc = "multi prog - drop, pass", + .prog1 = skel->progs.multi_prog_drop1, + .prog2 = skel->progs.multi_prog_pass2, + .listen_at = { EXT_IP4, EXT_PORT }, + .expect_errno = ECONNREFUSED, + }, + { + .desc = "multi prog - pass, redir", + .prog1 = skel->progs.multi_prog_pass1, + .prog2 = skel->progs.multi_prog_redir2, + .listen_at = { INT_IP4, INT_PORT }, + }, + { + .desc = "multi prog - redir, pass", + .prog1 = skel->progs.multi_prog_redir1, + .prog2 = skel->progs.multi_prog_pass2, + .listen_at = { INT_IP4, INT_PORT }, + }, + { + .desc = "multi prog - drop, redir", + .prog1 = skel->progs.multi_prog_drop1, + .prog2 = skel->progs.multi_prog_redir2, + .listen_at = { INT_IP4, INT_PORT }, + }, + { + .desc = "multi prog - redir, drop", + .prog1 = skel->progs.multi_prog_redir1, + .prog2 = skel->progs.multi_prog_drop2, + .listen_at = { INT_IP4, INT_PORT }, + }, + { + .desc = "multi prog - redir, redir", + .prog1 = skel->progs.multi_prog_redir1, + .prog2 = skel->progs.multi_prog_redir2, + .listen_at = { INT_IP4, INT_PORT }, + }, + }; + struct test_multi_prog *t; + + for (t = tests; t < tests + ARRAY_SIZE(tests); t++) { + t->redir_map = skel->maps.redir_map; + t->run_map = skel->maps.run_map; + if (test__start_subtest(t->desc)) + run_multi_prog_lookup(t); + } +} + +static void run_tests(struct test_sk_lookup *skel) +{ + if (test__start_subtest("query lookup prog")) + query_lookup_prog(skel); + test_redirect_lookup(skel); + test_drop_on_lookup(skel); + test_drop_on_reuseport(skel); + test_sk_assign_helper(skel); + test_multi_prog_lookup(skel); +} + +static int switch_netns(void) +{ + static const char * const setup_script[] = { + "ip -6 addr add dev lo " EXT_IP6 "/128", + "ip -6 addr add dev lo " INT_IP6 "/128", + "ip link set dev lo up", + NULL, + }; + const char * const *cmd; + int err; + + err = unshare(CLONE_NEWNET); + if (CHECK(err, "unshare", "failed\n")) { + log_err("unshare(CLONE_NEWNET)"); + return -1; + } + + for (cmd = setup_script; *cmd; cmd++) { + err = system(*cmd); + if (CHECK(err, "system", "failed\n")) { + log_err("system(%s)", *cmd); + return -1; + } + } + + return 0; +} + +void test_sk_lookup(void) +{ + struct test_sk_lookup *skel; + int err; + + err = switch_netns(); + if (err) + return; + + skel = test_sk_lookup__open_and_load(); + if (CHECK(!skel, "skel open_and_load", "failed\n")) + return; + + run_tests(skel); + + test_sk_lookup__destroy(skel); +} |