1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include "cgroup_helpers.h"
6 #include <linux/netlink.h>
7 #include "sockopt_sk.skel.h"
10 #define SOL_TCP IPPROTO_TCP
13 #define SOL_CUSTOM 0xdeadbeef
15 static int getsetsockopt(void)
21 char cc[16]; /* TCP_CA_NAME_MAX */
22 struct tcp_zerocopy_receive zc;
27 fd = socket(AF_INET, SOCK_STREAM, 0);
29 log_err("Failed to create socket");
33 /* IP_TOS - BPF bypass */
35 optlen = getpagesize() * 2;
36 big_buf = calloc(1, optlen);
38 log_err("Couldn't allocate two pages");
42 *(int *)big_buf = 0x08;
43 err = setsockopt(fd, SOL_IP, IP_TOS, big_buf, optlen);
45 log_err("Failed to call setsockopt(IP_TOS)");
49 memset(big_buf, 0, optlen);
51 err = getsockopt(fd, SOL_IP, IP_TOS, big_buf, &optlen);
53 log_err("Failed to call getsockopt(IP_TOS)");
57 if (*big_buf != 0x08) {
58 log_err("Unexpected getsockopt(IP_TOS) optval 0x%x != 0x08",
66 err = setsockopt(fd, SOL_IP, IP_TTL, &buf, 1);
67 if (!err || errno != EPERM) {
68 log_err("Unexpected success from setsockopt(IP_TTL)");
72 /* SOL_CUSTOM - handled by BPF */
75 err = setsockopt(fd, SOL_CUSTOM, 0, &buf, 1);
77 log_err("Failed to call setsockopt");
83 err = getsockopt(fd, SOL_CUSTOM, 0, &buf, &optlen);
85 log_err("Failed to call getsockopt");
90 log_err("Unexpected optlen %d != 1", optlen);
93 if (buf.u8[0] != 0x01) {
94 log_err("Unexpected buf[0] 0x%02x != 0x01", buf.u8[0]);
98 /* IP_FREEBIND - BPF can't access optval past PAGE_SIZE */
100 optlen = getpagesize() * 2;
101 memset(big_buf, 0, optlen);
103 err = setsockopt(fd, SOL_IP, IP_FREEBIND, big_buf, optlen);
105 log_err("Failed to call setsockopt, ret=%d", err);
109 err = getsockopt(fd, SOL_IP, IP_FREEBIND, big_buf, &optlen);
111 log_err("Failed to call getsockopt, ret=%d", err);
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);
120 /* SO_SNDBUF is overwritten */
122 buf.u32 = 0x01010101;
123 err = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &buf, 4);
125 log_err("Failed to call setsockopt(SO_SNDBUF)");
131 err = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &buf, &optlen);
133 log_err("Failed to call getsockopt(SO_SNDBUF)");
137 if (buf.u32 != 0x55AA*2) {
138 log_err("Unexpected getsockopt(SO_SNDBUF) 0x%x != 0x55AA*2",
143 /* TCP_CONGESTION can extend the string */
145 strcpy(buf.cc, "nv");
146 err = setsockopt(fd, SOL_TCP, TCP_CONGESTION, &buf, strlen("nv"));
148 log_err("Failed to call setsockopt(TCP_CONGESTION)");
153 optlen = sizeof(buf.cc);
154 err = getsockopt(fd, SOL_TCP, TCP_CONGESTION, &buf, &optlen);
156 log_err("Failed to call getsockopt(TCP_CONGESTION)");
160 if (strcmp(buf.cc, "cubic") != 0) {
161 log_err("Unexpected getsockopt(TCP_CONGESTION) %s != %s",
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);
171 log_err("Unexpected getsockopt(TCP_ZEROCOPY_RECEIVE) err=%d errno=%d",
176 memset(&buf, 0, sizeof(buf));
177 buf.zc.address = 12345; /* Not page aligned. Rejected by tcp_zerocopy_receive() */
178 optlen = sizeof(buf.zc);
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",
187 /* optval=NULL case is handled correctly */
190 fd = socket(AF_NETLINK, SOCK_RAW, 0);
192 log_err("Failed to create AF_NETLINK socket");
197 optlen = sizeof(__u32);
198 err = setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &buf, optlen);
200 log_err("Unexpected getsockopt(NETLINK_ADD_MEMBERSHIP) err=%d errno=%d",
206 err = getsockopt(fd, SOL_NETLINK, NETLINK_LIST_MEMBERSHIPS, NULL, &optlen);
208 log_err("Unexpected getsockopt(NETLINK_LIST_MEMBERSHIPS) err=%d errno=%d",
212 ASSERT_EQ(optlen, 8, "Unexpected NETLINK_LIST_MEMBERSHIPS value");
223 static void run_test(int cgroup_fd)
225 struct sockopt_sk *skel;
227 skel = sockopt_sk__open_and_load();
228 if (!ASSERT_OK_PTR(skel, "skel_load"))
231 skel->bss->page_size = getpagesize();
233 skel->links._setsockopt =
234 bpf_program__attach_cgroup(skel->progs._setsockopt, cgroup_fd);
235 if (!ASSERT_OK_PTR(skel->links._setsockopt, "setsockopt_link"))
238 skel->links._getsockopt =
239 bpf_program__attach_cgroup(skel->progs._getsockopt, cgroup_fd);
240 if (!ASSERT_OK_PTR(skel->links._getsockopt, "getsockopt_link"))
243 ASSERT_OK(getsetsockopt(), "getsetsockopt");
246 sockopt_sk__destroy(skel);
249 void test_sockopt_sk(void)
253 cgroup_fd = test__join_cgroup("/sockopt_sk");
254 if (!ASSERT_GE(cgroup_fd, 0, "join_cgroup /sockopt_sk"))