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257 lines
4.8 KiB
257 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (c) 2018 Facebook |
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// Copyright (c) 2019 Cloudflare |
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#include <limits.h> |
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#include <string.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <arpa/inet.h> |
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#include <netinet/in.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <bpf/bpf.h> |
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#include <bpf/libbpf.h> |
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#include "bpf_rlimit.h" |
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#include "cgroup_helpers.h" |
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static int start_server(const struct sockaddr *addr, socklen_t len) |
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{ |
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int fd; |
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fd = socket(addr->sa_family, SOCK_STREAM, 0); |
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if (fd == -1) { |
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log_err("Failed to create server socket"); |
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goto out; |
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} |
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if (bind(fd, addr, len) == -1) { |
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log_err("Failed to bind server socket"); |
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goto close_out; |
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} |
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if (listen(fd, 128) == -1) { |
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log_err("Failed to listen on server socket"); |
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goto close_out; |
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} |
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goto out; |
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close_out: |
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close(fd); |
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fd = -1; |
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out: |
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return fd; |
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} |
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static int connect_to_server(int server_fd) |
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{ |
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struct sockaddr_storage addr; |
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socklen_t len = sizeof(addr); |
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int fd = -1; |
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if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) { |
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log_err("Failed to get server addr"); |
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goto out; |
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} |
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fd = socket(addr.ss_family, SOCK_STREAM, 0); |
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if (fd == -1) { |
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log_err("Failed to create client socket"); |
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goto out; |
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} |
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if (connect(fd, (const struct sockaddr *)&addr, len) == -1) { |
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log_err("Fail to connect to server"); |
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goto close_out; |
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} |
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goto out; |
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close_out: |
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close(fd); |
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fd = -1; |
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out: |
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return fd; |
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} |
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static int get_map_fd_by_prog_id(int prog_id, bool *xdp) |
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{ |
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struct bpf_prog_info info = {}; |
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__u32 info_len = sizeof(info); |
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__u32 map_ids[1]; |
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int prog_fd = -1; |
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int map_fd = -1; |
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prog_fd = bpf_prog_get_fd_by_id(prog_id); |
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if (prog_fd < 0) { |
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log_err("Failed to get fd by prog id %d", prog_id); |
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goto err; |
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} |
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info.nr_map_ids = 1; |
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info.map_ids = (__u64)(unsigned long)map_ids; |
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if (bpf_obj_get_info_by_fd(prog_fd, &info, &info_len)) { |
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log_err("Failed to get info by prog fd %d", prog_fd); |
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goto err; |
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} |
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if (!info.nr_map_ids) { |
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log_err("No maps found for prog fd %d", prog_fd); |
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goto err; |
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} |
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*xdp = info.type == BPF_PROG_TYPE_XDP; |
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map_fd = bpf_map_get_fd_by_id(map_ids[0]); |
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if (map_fd < 0) |
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log_err("Failed to get fd by map id %d", map_ids[0]); |
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err: |
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if (prog_fd >= 0) |
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close(prog_fd); |
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return map_fd; |
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} |
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static int run_test(int server_fd, int results_fd, bool xdp) |
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{ |
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int client = -1, srv_client = -1; |
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int ret = 0; |
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__u32 key = 0; |
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__u32 key_gen = 1; |
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__u32 key_mss = 2; |
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__u32 value = 0; |
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__u32 value_gen = 0; |
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__u32 value_mss = 0; |
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if (bpf_map_update_elem(results_fd, &key, &value, 0) < 0) { |
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log_err("Can't clear results"); |
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goto err; |
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} |
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if (bpf_map_update_elem(results_fd, &key_gen, &value_gen, 0) < 0) { |
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log_err("Can't clear results"); |
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goto err; |
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} |
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if (bpf_map_update_elem(results_fd, &key_mss, &value_mss, 0) < 0) { |
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log_err("Can't clear results"); |
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goto err; |
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} |
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client = connect_to_server(server_fd); |
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if (client == -1) |
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goto err; |
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srv_client = accept(server_fd, NULL, 0); |
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if (srv_client == -1) { |
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log_err("Can't accept connection"); |
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goto err; |
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} |
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if (bpf_map_lookup_elem(results_fd, &key, &value) < 0) { |
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log_err("Can't lookup result"); |
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goto err; |
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} |
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if (value == 0) { |
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log_err("Didn't match syncookie: %u", value); |
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goto err; |
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} |
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if (bpf_map_lookup_elem(results_fd, &key_gen, &value_gen) < 0) { |
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log_err("Can't lookup result"); |
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goto err; |
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} |
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if (xdp && value_gen == 0) { |
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// SYN packets do not get passed through generic XDP, skip the |
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// rest of the test. |
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printf("Skipping XDP cookie check\n"); |
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goto out; |
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} |
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if (bpf_map_lookup_elem(results_fd, &key_mss, &value_mss) < 0) { |
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log_err("Can't lookup result"); |
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goto err; |
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} |
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if (value != value_gen) { |
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log_err("BPF generated cookie does not match kernel one"); |
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goto err; |
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} |
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if (value_mss < 536 || value_mss > USHRT_MAX) { |
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log_err("Unexpected MSS retrieved"); |
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goto err; |
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} |
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goto out; |
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err: |
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ret = 1; |
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out: |
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close(client); |
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close(srv_client); |
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return ret; |
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} |
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int main(int argc, char **argv) |
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{ |
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struct sockaddr_in addr4; |
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struct sockaddr_in6 addr6; |
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int server = -1; |
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int server_v6 = -1; |
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int results = -1; |
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int err = 0; |
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bool xdp; |
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if (argc < 2) { |
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fprintf(stderr, "Usage: %s prog_id\n", argv[0]); |
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exit(1); |
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} |
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results = get_map_fd_by_prog_id(atoi(argv[1]), &xdp); |
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if (results < 0) { |
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log_err("Can't get map"); |
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goto err; |
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} |
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memset(&addr4, 0, sizeof(addr4)); |
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addr4.sin_family = AF_INET; |
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addr4.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
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addr4.sin_port = 0; |
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memset(&addr6, 0, sizeof(addr6)); |
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addr6.sin6_family = AF_INET6; |
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addr6.sin6_addr = in6addr_loopback; |
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addr6.sin6_port = 0; |
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server = start_server((const struct sockaddr *)&addr4, sizeof(addr4)); |
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if (server == -1) |
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goto err; |
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server_v6 = start_server((const struct sockaddr *)&addr6, |
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sizeof(addr6)); |
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if (server_v6 == -1) |
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goto err; |
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if (run_test(server, results, xdp)) |
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goto err; |
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if (run_test(server_v6, results, xdp)) |
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goto err; |
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printf("ok\n"); |
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goto out; |
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err: |
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err = 1; |
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out: |
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close(server); |
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close(server_v6); |
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close(results); |
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return err; |
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}
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