1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2019 Facebook */
4 #include <sys/socket.h>
6 #include <netinet/in.h>
14 #include <bpf/libbpf.h>
16 #include "cgroup_helpers.h"
17 #include "bpf_rlimit.h"
25 #define CHECK(condition, tag, format...) ({ \
26 int __ret = !!(condition); \
28 printf("%s(%d):FAIL:%s ", __func__, __LINE__, tag); \
35 #define TEST_CGROUP "/test-bpf-sock-fields"
36 #define DATA "Hello BPF!"
37 #define DATA_LEN sizeof(DATA)
39 static struct sockaddr_in6 srv_sa6, cli_sa6;
40 static int linum_map_fd;
41 static int addr_map_fd;
44 static __u32 srv_idx = SRV_IDX;
45 static __u32 cli_idx = CLI_IDX;
47 static void init_loopback6(struct sockaddr_in6 *sa6)
49 memset(sa6, 0, sizeof(*sa6));
50 sa6->sin6_family = AF_INET6;
51 sa6->sin6_addr = in6addr_loopback;
54 static void print_sk(const struct bpf_sock *sk)
56 char src_ip4[24], dst_ip4[24];
57 char src_ip6[64], dst_ip6[64];
59 inet_ntop(AF_INET, &sk->src_ip4, src_ip4, sizeof(src_ip4));
60 inet_ntop(AF_INET6, &sk->src_ip6, src_ip6, sizeof(src_ip6));
61 inet_ntop(AF_INET, &sk->dst_ip4, dst_ip4, sizeof(dst_ip4));
62 inet_ntop(AF_INET6, &sk->dst_ip6, dst_ip6, sizeof(dst_ip6));
64 printf("state:%u bound_dev_if:%u family:%u type:%u protocol:%u mark:%u priority:%u "
65 "src_ip4:%x(%s) src_ip6:%x:%x:%x:%x(%s) src_port:%u "
66 "dst_ip4:%x(%s) dst_ip6:%x:%x:%x:%x(%s) dst_port:%u\n",
67 sk->state, sk->bound_dev_if, sk->family, sk->type, sk->protocol,
68 sk->mark, sk->priority,
70 sk->src_ip6[0], sk->src_ip6[1], sk->src_ip6[2], sk->src_ip6[3],
71 src_ip6, sk->src_port,
73 sk->dst_ip6[0], sk->dst_ip6[1], sk->dst_ip6[2], sk->dst_ip6[3],
74 dst_ip6, ntohs(sk->dst_port));
77 static void print_tp(const struct bpf_tcp_sock *tp)
79 printf("snd_cwnd:%u srtt_us:%u rtt_min:%u snd_ssthresh:%u rcv_nxt:%u "
80 "snd_nxt:%u snd:una:%u mss_cache:%u ecn_flags:%u "
81 "rate_delivered:%u rate_interval_us:%u packets_out:%u "
82 "retrans_out:%u total_retrans:%u segs_in:%u data_segs_in:%u "
83 "segs_out:%u data_segs_out:%u lost_out:%u sacked_out:%u "
84 "bytes_received:%llu bytes_acked:%llu\n",
85 tp->snd_cwnd, tp->srtt_us, tp->rtt_min, tp->snd_ssthresh,
86 tp->rcv_nxt, tp->snd_nxt, tp->snd_una, tp->mss_cache,
87 tp->ecn_flags, tp->rate_delivered, tp->rate_interval_us,
88 tp->packets_out, tp->retrans_out, tp->total_retrans,
89 tp->segs_in, tp->data_segs_in, tp->segs_out,
90 tp->data_segs_out, tp->lost_out, tp->sacked_out,
91 tp->bytes_received, tp->bytes_acked);
94 static void check_result(void)
96 struct bpf_tcp_sock srv_tp, cli_tp;
97 struct bpf_sock srv_sk, cli_sk;
98 __u32 linum, idx0 = 0;
101 err = bpf_map_lookup_elem(linum_map_fd, &idx0, &linum);
102 CHECK(err == -1, "bpf_map_lookup_elem(linum_map_fd)",
103 "err:%d errno:%d", err, errno);
105 err = bpf_map_lookup_elem(sk_map_fd, &srv_idx, &srv_sk);
106 CHECK(err == -1, "bpf_map_lookup_elem(sk_map_fd, &srv_idx)",
107 "err:%d errno:%d", err, errno);
108 err = bpf_map_lookup_elem(tp_map_fd, &srv_idx, &srv_tp);
109 CHECK(err == -1, "bpf_map_lookup_elem(tp_map_fd, &srv_idx)",
110 "err:%d errno:%d", err, errno);
112 err = bpf_map_lookup_elem(sk_map_fd, &cli_idx, &cli_sk);
113 CHECK(err == -1, "bpf_map_lookup_elem(sk_map_fd, &cli_idx)",
114 "err:%d errno:%d", err, errno);
115 err = bpf_map_lookup_elem(tp_map_fd, &cli_idx, &cli_tp);
116 CHECK(err == -1, "bpf_map_lookup_elem(tp_map_fd, &cli_idx)",
117 "err:%d errno:%d", err, errno);
135 CHECK(srv_sk.state == 10 ||
137 srv_sk.family != AF_INET6 ||
138 srv_sk.protocol != IPPROTO_TCP ||
139 memcmp(srv_sk.src_ip6, &in6addr_loopback,
140 sizeof(srv_sk.src_ip6)) ||
141 memcmp(srv_sk.dst_ip6, &in6addr_loopback,
142 sizeof(srv_sk.dst_ip6)) ||
143 srv_sk.src_port != ntohs(srv_sa6.sin6_port) ||
144 srv_sk.dst_port != cli_sa6.sin6_port,
145 "Unexpected srv_sk", "Check srv_sk output. linum:%u", linum);
147 CHECK(cli_sk.state == 10 ||
149 cli_sk.family != AF_INET6 ||
150 cli_sk.protocol != IPPROTO_TCP ||
151 memcmp(cli_sk.src_ip6, &in6addr_loopback,
152 sizeof(cli_sk.src_ip6)) ||
153 memcmp(cli_sk.dst_ip6, &in6addr_loopback,
154 sizeof(cli_sk.dst_ip6)) ||
155 cli_sk.src_port != ntohs(cli_sa6.sin6_port) ||
156 cli_sk.dst_port != srv_sa6.sin6_port,
157 "Unexpected cli_sk", "Check cli_sk output. linum:%u", linum);
159 CHECK(srv_tp.data_segs_out != 1 ||
160 srv_tp.data_segs_in ||
161 srv_tp.snd_cwnd != 10 ||
162 srv_tp.total_retrans ||
163 srv_tp.bytes_acked != DATA_LEN,
164 "Unexpected srv_tp", "Check srv_tp output. linum:%u", linum);
166 CHECK(cli_tp.data_segs_out ||
167 cli_tp.data_segs_in != 1 ||
168 cli_tp.snd_cwnd != 10 ||
169 cli_tp.total_retrans ||
170 cli_tp.bytes_received != DATA_LEN,
171 "Unexpected cli_tp", "Check cli_tp output. linum:%u", linum);
174 static void test(void)
176 int listen_fd, cli_fd, accept_fd, epfd, err;
177 struct epoll_event ev;
180 addrlen = sizeof(struct sockaddr_in6);
183 epfd = epoll_create(1);
184 CHECK(epfd == -1, "epoll_create()", "epfd:%d errno:%d", epfd, errno);
186 /* Prepare listen_fd */
187 listen_fd = socket(AF_INET6, SOCK_STREAM | SOCK_NONBLOCK, 0);
188 CHECK(listen_fd == -1, "socket()", "listen_fd:%d errno:%d",
191 init_loopback6(&srv_sa6);
192 err = bind(listen_fd, (struct sockaddr *)&srv_sa6, sizeof(srv_sa6));
193 CHECK(err, "bind(listen_fd)", "err:%d errno:%d", err, errno);
195 err = getsockname(listen_fd, (struct sockaddr *)&srv_sa6, &addrlen);
196 CHECK(err, "getsockname(listen_fd)", "err:%d errno:%d", err, errno);
198 err = listen(listen_fd, 1);
199 CHECK(err, "listen(listen_fd)", "err:%d errno:%d", err, errno);
202 cli_fd = socket(AF_INET6, SOCK_STREAM | SOCK_NONBLOCK, 0);
203 CHECK(cli_fd == -1, "socket()", "cli_fd:%d errno:%d", cli_fd, errno);
205 init_loopback6(&cli_sa6);
206 err = bind(cli_fd, (struct sockaddr *)&cli_sa6, sizeof(cli_sa6));
207 CHECK(err, "bind(cli_fd)", "err:%d errno:%d", err, errno);
209 err = getsockname(cli_fd, (struct sockaddr *)&cli_sa6, &addrlen);
210 CHECK(err, "getsockname(cli_fd)", "err:%d errno:%d",
213 /* Update addr_map with srv_sa6 and cli_sa6 */
214 err = bpf_map_update_elem(addr_map_fd, &srv_idx, &srv_sa6, 0);
215 CHECK(err, "map_update", "err:%d errno:%d", err, errno);
217 err = bpf_map_update_elem(addr_map_fd, &cli_idx, &cli_sa6, 0);
218 CHECK(err, "map_update", "err:%d errno:%d", err, errno);
220 /* Connect from cli_sa6 to srv_sa6 */
221 err = connect(cli_fd, (struct sockaddr *)&srv_sa6, addrlen);
222 printf("srv_sa6.sin6_port:%u cli_sa6.sin6_port:%u\n\n",
223 ntohs(srv_sa6.sin6_port), ntohs(cli_sa6.sin6_port));
224 CHECK(err && errno != EINPROGRESS,
225 "connect(cli_fd)", "err:%d errno:%d", err, errno);
227 ev.data.fd = listen_fd;
228 err = epoll_ctl(epfd, EPOLL_CTL_ADD, listen_fd, &ev);
229 CHECK(err, "epoll_ctl(EPOLL_CTL_ADD, listen_fd)", "err:%d errno:%d",
232 /* Accept the connection */
233 /* Have some timeout in accept(listen_fd). Just in case. */
234 err = epoll_wait(epfd, &ev, 1, 1000);
235 CHECK(err != 1 || ev.data.fd != listen_fd,
236 "epoll_wait(listen_fd)",
237 "err:%d errno:%d ev.data.fd:%d listen_fd:%d",
238 err, errno, ev.data.fd, listen_fd);
240 accept_fd = accept(listen_fd, NULL, NULL);
241 CHECK(accept_fd == -1, "accept(listen_fd)", "accept_fd:%d errno:%d",
245 /* Send some data from accept_fd to cli_fd */
246 err = send(accept_fd, DATA, DATA_LEN, 0);
247 CHECK(err != DATA_LEN, "send(accept_fd)", "err:%d errno:%d",
250 /* Have some timeout in recv(cli_fd). Just in case. */
252 err = epoll_ctl(epfd, EPOLL_CTL_ADD, cli_fd, &ev);
253 CHECK(err, "epoll_ctl(EPOLL_CTL_ADD, cli_fd)", "err:%d errno:%d",
256 err = epoll_wait(epfd, &ev, 1, 1000);
257 CHECK(err != 1 || ev.data.fd != cli_fd,
258 "epoll_wait(cli_fd)", "err:%d errno:%d ev.data.fd:%d cli_fd:%d",
259 err, errno, ev.data.fd, cli_fd);
261 err = recv(cli_fd, NULL, 0, MSG_TRUNC);
262 CHECK(err, "recv(cli_fd)", "err:%d errno:%d", err, errno);
271 int main(int argc, char **argv)
273 struct bpf_prog_load_attr attr = {
274 .file = "test_sock_fields_kern.o",
275 .prog_type = BPF_PROG_TYPE_CGROUP_SKB,
276 .expected_attach_type = BPF_CGROUP_INET_EGRESS,
278 int cgroup_fd, prog_fd, err;
279 struct bpf_object *obj;
282 err = setup_cgroup_environment();
283 CHECK(err, "setup_cgroup_environment()", "err:%d errno:%d",
286 atexit(cleanup_cgroup_environment);
288 /* Create a cgroup, get fd, and join it */
289 cgroup_fd = create_and_get_cgroup(TEST_CGROUP);
290 CHECK(cgroup_fd == -1, "create_and_get_cgroup()",
291 "cgroup_fd:%d errno:%d", cgroup_fd, errno);
293 err = join_cgroup(TEST_CGROUP);
294 CHECK(err, "join_cgroup", "err:%d errno:%d", err, errno);
296 err = bpf_prog_load_xattr(&attr, &obj, &prog_fd);
297 CHECK(err, "bpf_prog_load_xattr()", "err:%d", err);
299 err = bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_INET_EGRESS, 0);
300 CHECK(err == -1, "bpf_prog_attach(CPF_CGROUP_INET_EGRESS)",
301 "err:%d errno%d", err, errno);
304 map = bpf_object__find_map_by_name(obj, "addr_map");
305 CHECK(!map, "cannot find addr_map", "(null)");
306 addr_map_fd = bpf_map__fd(map);
308 map = bpf_object__find_map_by_name(obj, "sock_result_map");
309 CHECK(!map, "cannot find sock_result_map", "(null)");
310 sk_map_fd = bpf_map__fd(map);
312 map = bpf_object__find_map_by_name(obj, "tcp_sock_result_map");
313 CHECK(!map, "cannot find tcp_sock_result_map", "(null)");
314 tp_map_fd = bpf_map__fd(map);
316 map = bpf_object__find_map_by_name(obj, "linum_map");
317 CHECK(!map, "cannot find linum_map", "(null)");
318 linum_map_fd = bpf_map__fd(map);
322 bpf_object__close(obj);
323 cleanup_cgroup_environment();