1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include "cgroup_helpers.h"
4
5 #include <linux/tcp.h>
6 #include <linux/netlink.h>
7 #include "sockopt_sk.skel.h"
8
9 #ifndef SOL_TCP
10 #define SOL_TCP IPPROTO_TCP
11 #endif
12
13 #define SOL_CUSTOM 0xdeadbeef
14
15 static int getsetsockopt(void)
16 {
17 int fd, err;
18 union {
19 char u8[4];
20 __u32 u32;
21 char cc[16]; /* TCP_CA_NAME_MAX */
22 struct tcp_zerocopy_receive zc;
23 } buf = {};
24 socklen_t optlen;
25 char *big_buf = NULL;
26
27 fd = socket(AF_INET, SOCK_STREAM, 0);
28 if (fd < 0) {
29 log_err("Failed to create socket");
30 return -1;
31 }
32
33 /* IP_TOS - BPF bypass */
34
35 optlen = getpagesize() * 2;
36 big_buf = calloc(1, optlen);
37 if (!big_buf) {
38 log_err("Couldn't allocate two pages");
39 goto err;
40 }
41
42 *(int *)big_buf = 0x08;
43 err = setsockopt(fd, SOL_IP, IP_TOS, big_buf, optlen);
44 if (err) {
45 log_err("Failed to call setsockopt(IP_TOS)");
46 goto err;
47 }
48
49 memset(big_buf, 0, optlen);
50 optlen = 1;
51 err = getsockopt(fd, SOL_IP, IP_TOS, big_buf, &optlen);
52 if (err) {
53 log_err("Failed to call getsockopt(IP_TOS)");
54 goto err;
55 }
56
57 if (*big_buf != 0x08) {
58 log_err("Unexpected getsockopt(IP_TOS) optval 0x%x != 0x08",
59 (int)*big_buf);
60 goto err;
61 }
62
63 /* IP_TTL - EPERM */
64
65 buf.u8[0] = 1;
66 err = setsockopt(fd, SOL_IP, IP_TTL, &buf, 1);
67 if (!err || errno != EPERM) {
68 log_err("Unexpected success from setsockopt(IP_TTL)");
69 goto err;
70 }
71
72 /* SOL_CUSTOM - handled by BPF */
73
74 buf.u8[0] = 0x01;
75 err = setsockopt(fd, SOL_CUSTOM, 0, &buf, 1);
76 if (err) {
77 log_err("Failed to call setsockopt");
78 goto err;
79 }
80
81 buf.u32 = 0x00;
82 optlen = 4;
83 err = getsockopt(fd, SOL_CUSTOM, 0, &buf, &optlen);
84 if (err) {
85 log_err("Failed to call getsockopt");
86 goto err;
87 }
88
89 if (optlen != 1) {
90 log_err("Unexpected optlen %d != 1", optlen);
91 goto err;
92 }
93 if (buf.u8[0] != 0x01) {
94 log_err("Unexpected buf[0] 0x%02x != 0x01", buf.u8[0]);
95 goto err;
96 }
97
98 /* IP_FREEBIND - BPF can't access optval past PAGE_SIZE */
99
100 optlen = getpagesize() * 2;
101 memset(big_buf, 0, optlen);
102
103 err = setsockopt(fd, SOL_IP, IP_FREEBIND, big_buf, optlen);
104 if (err != 0) {
105 log_err("Failed to call setsockopt, ret=%d", err);
106 goto err;
107 }
108
109 err = getsockopt(fd, SOL_IP, IP_FREEBIND, big_buf, &optlen);
110 if (err != 0) {
111 log_err("Failed to call getsockopt, ret=%d", err);
112 goto err;
113 }
114
115 if (optlen != 1 || *(__u8 *)big_buf != 0x55) {
116 log_err("Unexpected IP_FREEBIND getsockopt, optlen=%d, optval=0x%x",
117 optlen, *(__u8 *)big_buf);
118 }
119
120 /* SO_SNDBUF is overwritten */
121
122 buf.u32 = 0x01010101;
123 err = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &buf, 4);
124 if (err) {
125 log_err("Failed to call setsockopt(SO_SNDBUF)");
126 goto err;
127 }
128
129 buf.u32 = 0x00;
130 optlen = 4;
131 err = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &buf, &optlen);
132 if (err) {
133 log_err("Failed to call getsockopt(SO_SNDBUF)");
134 goto err;
135 }
136
137 if (buf.u32 != 0x55AA*2) {
138 log_err("Unexpected getsockopt(SO_SNDBUF) 0x%x != 0x55AA*2",
139 buf.u32);
140 goto err;
141 }
142
143 /* TCP_CONGESTION can extend the string */
144
145 strcpy(buf.cc, "nv");
146 err = setsockopt(fd, SOL_TCP, TCP_CONGESTION, &buf, strlen("nv"));
147 if (err) {
148 log_err("Failed to call setsockopt(TCP_CONGESTION)");
149 goto err;
150 }
151
152
153 optlen = sizeof(buf.cc);
154 err = getsockopt(fd, SOL_TCP, TCP_CONGESTION, &buf, &optlen);
155 if (err) {
156 log_err("Failed to call getsockopt(TCP_CONGESTION)");
157 goto err;
158 }
159
160 if (strcmp(buf.cc, "cubic") != 0) {
161 log_err("Unexpected getsockopt(TCP_CONGESTION) %s != %s",
162 buf.cc, "cubic");
163 goto err;
164 }
165
166 /* TCP_ZEROCOPY_RECEIVE triggers */
167 memset(&buf, 0, sizeof(buf));
168 optlen = sizeof(buf.zc);
169 err = getsockopt(fd, SOL_TCP, TCP_ZEROCOPY_RECEIVE, &buf, &optlen);
170 if (err) {
171 log_err("Unexpected getsockopt(TCP_ZEROCOPY_RECEIVE) err=%d errno=%d",
172 err, errno);
173 goto err;
174 }
175
176 memset(&buf, 0, sizeof(buf));
177 buf.zc.address = 12345; /* Not page aligned. Rejected by tcp_zerocopy_receive() */
178 optlen = sizeof(buf.zc);
179 errno = 0;
180 err = getsockopt(fd, SOL_TCP, TCP_ZEROCOPY_RECEIVE, &buf, &optlen);
181 if (errno != EINVAL) {
182 log_err("Unexpected getsockopt(TCP_ZEROCOPY_RECEIVE) err=%d errno=%d",
183 err, errno);
184 goto err;
185 }
186
187 /* optval=NULL case is handled correctly */
188
189 close(fd);
190 fd = socket(AF_NETLINK, SOCK_RAW, 0);
191 if (fd < 0) {
192 log_err("Failed to create AF_NETLINK socket");
193 return -1;
194 }
195
196 buf.u32 = 1;
197 optlen = sizeof(__u32);
198 err = setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &buf, optlen);
199 if (err) {
200 log_err("Unexpected getsockopt(NETLINK_ADD_MEMBERSHIP) err=%d errno=%d",
201 err, errno);
202 goto err;
203 }
204
205 optlen = 0;
206 err = getsockopt(fd, SOL_NETLINK, NETLINK_LIST_MEMBERSHIPS, NULL, &optlen);
207 if (err) {
208 log_err("Unexpected getsockopt(NETLINK_LIST_MEMBERSHIPS) err=%d errno=%d",
209 err, errno);
210 goto err;
211 }
212 ASSERT_EQ(optlen, 8, "Unexpected NETLINK_LIST_MEMBERSHIPS value");
213
214 free(big_buf);
215 close(fd);
216 return 0;
217 err:
218 free(big_buf);
219 close(fd);
220 return -1;
221 }
222
223 static void run_test(int cgroup_fd)
224 {
225 struct sockopt_sk *skel;
226
227 skel = sockopt_sk__open_and_load();
228 if (!ASSERT_OK_PTR(skel, "skel_load"))
229 goto cleanup;
230
231 skel->bss->page_size = getpagesize();
232
233 skel->links._setsockopt =
234 bpf_program__attach_cgroup(skel->progs._setsockopt, cgroup_fd);
235 if (!ASSERT_OK_PTR(skel->links._setsockopt, "setsockopt_link"))
236 goto cleanup;
237
238 skel->links._getsockopt =
239 bpf_program__attach_cgroup(skel->progs._getsockopt, cgroup_fd);
240 if (!ASSERT_OK_PTR(skel->links._getsockopt, "getsockopt_link"))
241 goto cleanup;
242
243 ASSERT_OK(getsetsockopt(), "getsetsockopt");
244
245 cleanup:
246 sockopt_sk__destroy(skel);
247 }
248
249 void test_sockopt_sk(void)
250 {
251 int cgroup_fd;
252
253 cgroup_fd = test__join_cgroup("/sockopt_sk");
254 if (!ASSERT_GE(cgroup_fd, 0, "join_cgroup /sockopt_sk"))
255 return;
256
257 run_test(cgroup_fd);
258 close(cgroup_fd);
259 }
260
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