mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
361d32028c
Since there is no convenient way for bpf program to get PAGE_SIZE from inside of the kernel, pass the value from userspace. Zero-initialize the variable in bpf prog, otherwise it will cause problems on some versions of Clang. Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@redhat.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210408061310.95877-3-yauheni.kaliuta@redhat.com
231 lines
4.8 KiB
C
231 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <test_progs.h>
|
|
#include "cgroup_helpers.h"
|
|
|
|
#include <linux/tcp.h>
|
|
#include "sockopt_sk.skel.h"
|
|
|
|
#ifndef SOL_TCP
|
|
#define SOL_TCP IPPROTO_TCP
|
|
#endif
|
|
|
|
#define SOL_CUSTOM 0xdeadbeef
|
|
|
|
static int getsetsockopt(void)
|
|
{
|
|
int fd, err;
|
|
union {
|
|
char u8[4];
|
|
__u32 u32;
|
|
char cc[16]; /* TCP_CA_NAME_MAX */
|
|
struct tcp_zerocopy_receive zc;
|
|
} buf = {};
|
|
socklen_t optlen;
|
|
char *big_buf = NULL;
|
|
|
|
fd = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (fd < 0) {
|
|
log_err("Failed to create socket");
|
|
return -1;
|
|
}
|
|
|
|
/* IP_TOS - BPF bypass */
|
|
|
|
optlen = getpagesize() * 2;
|
|
big_buf = calloc(1, optlen);
|
|
if (!big_buf) {
|
|
log_err("Couldn't allocate two pages");
|
|
goto err;
|
|
}
|
|
|
|
*(int *)big_buf = 0x08;
|
|
err = setsockopt(fd, SOL_IP, IP_TOS, big_buf, optlen);
|
|
if (err) {
|
|
log_err("Failed to call setsockopt(IP_TOS)");
|
|
goto err;
|
|
}
|
|
|
|
memset(big_buf, 0, optlen);
|
|
optlen = 1;
|
|
err = getsockopt(fd, SOL_IP, IP_TOS, big_buf, &optlen);
|
|
if (err) {
|
|
log_err("Failed to call getsockopt(IP_TOS)");
|
|
goto err;
|
|
}
|
|
|
|
if (*big_buf != 0x08) {
|
|
log_err("Unexpected getsockopt(IP_TOS) optval 0x%x != 0x08",
|
|
(int)*big_buf);
|
|
goto err;
|
|
}
|
|
|
|
/* IP_TTL - EPERM */
|
|
|
|
buf.u8[0] = 1;
|
|
err = setsockopt(fd, SOL_IP, IP_TTL, &buf, 1);
|
|
if (!err || errno != EPERM) {
|
|
log_err("Unexpected success from setsockopt(IP_TTL)");
|
|
goto err;
|
|
}
|
|
|
|
/* SOL_CUSTOM - handled by BPF */
|
|
|
|
buf.u8[0] = 0x01;
|
|
err = setsockopt(fd, SOL_CUSTOM, 0, &buf, 1);
|
|
if (err) {
|
|
log_err("Failed to call setsockopt");
|
|
goto err;
|
|
}
|
|
|
|
buf.u32 = 0x00;
|
|
optlen = 4;
|
|
err = getsockopt(fd, SOL_CUSTOM, 0, &buf, &optlen);
|
|
if (err) {
|
|
log_err("Failed to call getsockopt");
|
|
goto err;
|
|
}
|
|
|
|
if (optlen != 1) {
|
|
log_err("Unexpected optlen %d != 1", optlen);
|
|
goto err;
|
|
}
|
|
if (buf.u8[0] != 0x01) {
|
|
log_err("Unexpected buf[0] 0x%02x != 0x01", buf.u8[0]);
|
|
goto err;
|
|
}
|
|
|
|
/* IP_FREEBIND - BPF can't access optval past PAGE_SIZE */
|
|
|
|
optlen = getpagesize() * 2;
|
|
memset(big_buf, 0, optlen);
|
|
|
|
err = setsockopt(fd, SOL_IP, IP_FREEBIND, big_buf, optlen);
|
|
if (err != 0) {
|
|
log_err("Failed to call setsockopt, ret=%d", err);
|
|
goto err;
|
|
}
|
|
|
|
err = getsockopt(fd, SOL_IP, IP_FREEBIND, big_buf, &optlen);
|
|
if (err != 0) {
|
|
log_err("Failed to call getsockopt, ret=%d", err);
|
|
goto err;
|
|
}
|
|
|
|
if (optlen != 1 || *(__u8 *)big_buf != 0x55) {
|
|
log_err("Unexpected IP_FREEBIND getsockopt, optlen=%d, optval=0x%x",
|
|
optlen, *(__u8 *)big_buf);
|
|
}
|
|
|
|
/* SO_SNDBUF is overwritten */
|
|
|
|
buf.u32 = 0x01010101;
|
|
err = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &buf, 4);
|
|
if (err) {
|
|
log_err("Failed to call setsockopt(SO_SNDBUF)");
|
|
goto err;
|
|
}
|
|
|
|
buf.u32 = 0x00;
|
|
optlen = 4;
|
|
err = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &buf, &optlen);
|
|
if (err) {
|
|
log_err("Failed to call getsockopt(SO_SNDBUF)");
|
|
goto err;
|
|
}
|
|
|
|
if (buf.u32 != 0x55AA*2) {
|
|
log_err("Unexpected getsockopt(SO_SNDBUF) 0x%x != 0x55AA*2",
|
|
buf.u32);
|
|
goto err;
|
|
}
|
|
|
|
/* TCP_CONGESTION can extend the string */
|
|
|
|
strcpy(buf.cc, "nv");
|
|
err = setsockopt(fd, SOL_TCP, TCP_CONGESTION, &buf, strlen("nv"));
|
|
if (err) {
|
|
log_err("Failed to call setsockopt(TCP_CONGESTION)");
|
|
goto err;
|
|
}
|
|
|
|
|
|
optlen = sizeof(buf.cc);
|
|
err = getsockopt(fd, SOL_TCP, TCP_CONGESTION, &buf, &optlen);
|
|
if (err) {
|
|
log_err("Failed to call getsockopt(TCP_CONGESTION)");
|
|
goto err;
|
|
}
|
|
|
|
if (strcmp(buf.cc, "cubic") != 0) {
|
|
log_err("Unexpected getsockopt(TCP_CONGESTION) %s != %s",
|
|
buf.cc, "cubic");
|
|
goto err;
|
|
}
|
|
|
|
/* TCP_ZEROCOPY_RECEIVE triggers */
|
|
memset(&buf, 0, sizeof(buf));
|
|
optlen = sizeof(buf.zc);
|
|
err = getsockopt(fd, SOL_TCP, TCP_ZEROCOPY_RECEIVE, &buf, &optlen);
|
|
if (err) {
|
|
log_err("Unexpected getsockopt(TCP_ZEROCOPY_RECEIVE) err=%d errno=%d",
|
|
err, errno);
|
|
goto err;
|
|
}
|
|
|
|
memset(&buf, 0, sizeof(buf));
|
|
buf.zc.address = 12345; /* rejected by BPF */
|
|
optlen = sizeof(buf.zc);
|
|
errno = 0;
|
|
err = getsockopt(fd, SOL_TCP, TCP_ZEROCOPY_RECEIVE, &buf, &optlen);
|
|
if (errno != EPERM) {
|
|
log_err("Unexpected getsockopt(TCP_ZEROCOPY_RECEIVE) err=%d errno=%d",
|
|
err, errno);
|
|
goto err;
|
|
}
|
|
|
|
free(big_buf);
|
|
close(fd);
|
|
return 0;
|
|
err:
|
|
free(big_buf);
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
static void run_test(int cgroup_fd)
|
|
{
|
|
struct sockopt_sk *skel;
|
|
|
|
skel = sockopt_sk__open_and_load();
|
|
if (!ASSERT_OK_PTR(skel, "skel_load"))
|
|
goto cleanup;
|
|
|
|
skel->bss->page_size = getpagesize();
|
|
|
|
skel->links._setsockopt =
|
|
bpf_program__attach_cgroup(skel->progs._setsockopt, cgroup_fd);
|
|
if (!ASSERT_OK_PTR(skel->links._setsockopt, "setsockopt_link"))
|
|
goto cleanup;
|
|
|
|
skel->links._getsockopt =
|
|
bpf_program__attach_cgroup(skel->progs._getsockopt, cgroup_fd);
|
|
if (!ASSERT_OK_PTR(skel->links._getsockopt, "getsockopt_link"))
|
|
goto cleanup;
|
|
|
|
ASSERT_OK(getsetsockopt(), "getsetsockopt");
|
|
|
|
cleanup:
|
|
sockopt_sk__destroy(skel);
|
|
}
|
|
|
|
void test_sockopt_sk(void)
|
|
{
|
|
int cgroup_fd;
|
|
|
|
cgroup_fd = test__join_cgroup("/sockopt_sk");
|
|
if (CHECK_FAIL(cgroup_fd < 0))
|
|
return;
|
|
|
|
run_test(cgroup_fd);
|
|
close(cgroup_fd);
|
|
}
|