1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Test functionality of BPF filters with SO_REUSEPORT. Same test as
4 * in reuseport_bpf_cpu, only as one socket per NUMA node.
5 */
6
7 #define _GNU_SOURCE
8
9 #include <arpa/inet.h>
10 #include <errno.h>
11 #include <error.h>
12 #include <linux/filter.h>
13 #include <linux/bpf.h>
14 #include <linux/in.h>
15 #include <linux/unistd.h>
16 #include <sched.h>
17 #include <stdio.h>
18 #include <stdlib.h>
19 #include <string.h>
20 #include <sys/epoll.h>
21 #include <sys/types.h>
22 #include <sys/socket.h>
23 #include <unistd.h>
24 #include <numa.h>
25
26 #include "../kselftest.h"
27
28 static const int PORT = 8888;
29
30 static void build_rcv_group(int *rcv_fd, size_t len, int family, int proto)
31 {
32 struct sockaddr_storage addr;
33 struct sockaddr_in *addr4;
34 struct sockaddr_in6 *addr6;
35 size_t i;
36 int opt;
37
38 switch (family) {
39 case AF_INET:
40 addr4 = (struct sockaddr_in *)&addr;
41 addr4->sin_family = AF_INET;
42 addr4->sin_addr.s_addr = htonl(INADDR_ANY);
43 addr4->sin_port = htons(PORT);
44 break;
45 case AF_INET6:
46 addr6 = (struct sockaddr_in6 *)&addr;
47 addr6->sin6_family = AF_INET6;
48 addr6->sin6_addr = in6addr_any;
49 addr6->sin6_port = htons(PORT);
50 break;
51 default:
52 error(1, 0, "Unsupported family %d", family);
53 }
54
55 for (i = 0; i < len; ++i) {
56 rcv_fd[i] = socket(family, proto, 0);
57 if (rcv_fd[i] < 0)
58 error(1, errno, "failed to create receive socket");
59
60 opt = 1;
61 if (setsockopt(rcv_fd[i], SOL_SOCKET, SO_REUSEPORT, &opt,
62 sizeof(opt)))
63 error(1, errno, "failed to set SO_REUSEPORT");
64
65 if (bind(rcv_fd[i], (struct sockaddr *)&addr, sizeof(addr)))
66 error(1, errno, "failed to bind receive socket");
67
68 if (proto == SOCK_STREAM && listen(rcv_fd[i], len * 10))
69 error(1, errno, "failed to listen on receive port");
70 }
71 }
72
73 static void attach_bpf(int fd)
74 {
75 static char bpf_log_buf[65536];
76 static const char bpf_license[] = "";
77
78 int bpf_fd;
79 const struct bpf_insn prog[] = {
80 /* R0 = bpf_get_numa_node_id() */
81 { BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_numa_node_id },
82 /* return R0 */
83 { BPF_JMP | BPF_EXIT, 0, 0, 0, 0 }
84 };
85 union bpf_attr attr;
86
87 memset(&attr, 0, sizeof(attr));
88 attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
89 attr.insn_cnt = ARRAY_SIZE(prog);
90 attr.insns = (unsigned long) &prog;
91 attr.license = (unsigned long) &bpf_license;
92 attr.log_buf = (unsigned long) &bpf_log_buf;
93 attr.log_size = sizeof(bpf_log_buf);
94 attr.log_level = 1;
95
96 bpf_fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
97 if (bpf_fd < 0)
98 error(1, errno, "ebpf error. log:\n%s\n", bpf_log_buf);
99
100 if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF, &bpf_fd,
101 sizeof(bpf_fd)))
102 error(1, errno, "failed to set SO_ATTACH_REUSEPORT_EBPF");
103
104 close(bpf_fd);
105 }
106
107 static void send_from_node(int node_id, int family, int proto)
108 {
109 struct sockaddr_storage saddr, daddr;
110 struct sockaddr_in *saddr4, *daddr4;
111 struct sockaddr_in6 *saddr6, *daddr6;
112 int fd;
113
114 switch (family) {
115 case AF_INET:
116 saddr4 = (struct sockaddr_in *)&saddr;
117 saddr4->sin_family = AF_INET;
118 saddr4->sin_addr.s_addr = htonl(INADDR_ANY);
119 saddr4->sin_port = 0;
120
121 daddr4 = (struct sockaddr_in *)&daddr;
122 daddr4->sin_family = AF_INET;
123 daddr4->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
124 daddr4->sin_port = htons(PORT);
125 break;
126 case AF_INET6:
127 saddr6 = (struct sockaddr_in6 *)&saddr;
128 saddr6->sin6_family = AF_INET6;
129 saddr6->sin6_addr = in6addr_any;
130 saddr6->sin6_port = 0;
131
132 daddr6 = (struct sockaddr_in6 *)&daddr;
133 daddr6->sin6_family = AF_INET6;
134 daddr6->sin6_addr = in6addr_loopback;
135 daddr6->sin6_port = htons(PORT);
136 break;
137 default:
138 error(1, 0, "Unsupported family %d", family);
139 }
140
141 if (numa_run_on_node(node_id) < 0)
142 error(1, errno, "failed to pin to node");
143
144 fd = socket(family, proto, 0);
145 if (fd < 0)
146 error(1, errno, "failed to create send socket");
147
148 if (bind(fd, (struct sockaddr *)&saddr, sizeof(saddr)))
149 error(1, errno, "failed to bind send socket");
150
151 if (connect(fd, (struct sockaddr *)&daddr, sizeof(daddr)))
152 error(1, errno, "failed to connect send socket");
153
154 if (send(fd, "a", 1, 0) < 0)
155 error(1, errno, "failed to send message");
156
157 close(fd);
158 }
159
160 static
161 void receive_on_node(int *rcv_fd, int len, int epfd, int node_id, int proto)
162 {
163 struct epoll_event ev;
164 int i, fd;
165 char buf[8];
166
167 i = epoll_wait(epfd, &ev, 1, -1);
168 if (i < 0)
169 error(1, errno, "epoll_wait failed");
170
171 if (proto == SOCK_STREAM) {
172 fd = accept(ev.data.fd, NULL, NULL);
173 if (fd < 0)
174 error(1, errno, "failed to accept");
175 i = recv(fd, buf, sizeof(buf), 0);
176 close(fd);
177 } else {
178 i = recv(ev.data.fd, buf, sizeof(buf), 0);
179 }
180
181 if (i < 0)
182 error(1, errno, "failed to recv");
183
184 for (i = 0; i < len; ++i)
185 if (ev.data.fd == rcv_fd[i])
186 break;
187 if (i == len)
188 error(1, 0, "failed to find socket");
189 fprintf(stderr, "send node %d, receive socket %d\n", node_id, i);
190 if (node_id != i)
191 error(1, 0, "node id/receive socket mismatch");
192 }
193
194 static void test(int *rcv_fd, int len, int family, int proto)
195 {
196 struct epoll_event ev;
197 int epfd, node;
198
199 build_rcv_group(rcv_fd, len, family, proto);
200 attach_bpf(rcv_fd[0]);
201
202 epfd = epoll_create(1);
203 if (epfd < 0)
204 error(1, errno, "failed to create epoll");
205 for (node = 0; node < len; ++node) {
206 ev.events = EPOLLIN;
207 ev.data.fd = rcv_fd[node];
208 if (epoll_ctl(epfd, EPOLL_CTL_ADD, rcv_fd[node], &ev))
209 error(1, errno, "failed to register sock epoll");
210 }
211
212 /* Forward iterate */
213 for (node = 0; node < len; ++node) {
214 if (!numa_bitmask_isbitset(numa_nodes_ptr, node))
215 continue;
216 send_from_node(node, family, proto);
217 receive_on_node(rcv_fd, len, epfd, node, proto);
218 }
219
220 /* Reverse iterate */
221 for (node = len - 1; node >= 0; --node) {
222 if (!numa_bitmask_isbitset(numa_nodes_ptr, node))
223 continue;
224 send_from_node(node, family, proto);
225 receive_on_node(rcv_fd, len, epfd, node, proto);
226 }
227
228 close(epfd);
229 for (node = 0; node < len; ++node)
230 close(rcv_fd[node]);
231 }
232
233 int main(void)
234 {
235 int *rcv_fd, nodes;
236
237 if (numa_available() < 0)
238 ksft_exit_skip("no numa api support\n");
239
240 nodes = numa_max_node() + 1;
241
242 rcv_fd = calloc(nodes, sizeof(int));
243 if (!rcv_fd)
244 error(1, 0, "failed to allocate array");
245
246 fprintf(stderr, "---- IPv4 UDP ----\n");
247 test(rcv_fd, nodes, AF_INET, SOCK_DGRAM);
248
249 fprintf(stderr, "---- IPv6 UDP ----\n");
250 test(rcv_fd, nodes, AF_INET6, SOCK_DGRAM);
251
252 fprintf(stderr, "---- IPv4 TCP ----\n");
253 test(rcv_fd, nodes, AF_INET, SOCK_STREAM);
254
255 fprintf(stderr, "---- IPv6 TCP ----\n");
256 test(rcv_fd, nodes, AF_INET6, SOCK_STREAM);
257
258 free(rcv_fd);
259
260 fprintf(stderr, "SUCCESS\n");
261 return 0;
262 }
263
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