cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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udp_limit.c (2036B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <test_progs.h>
      3#include "udp_limit.skel.h"
      4
      5#include <sys/types.h>
      6#include <sys/socket.h>
      7
      8static int duration;
      9
     10void test_udp_limit(void)
     11{
     12	struct udp_limit *skel;
     13	int fd1 = -1, fd2 = -1;
     14	int cgroup_fd;
     15
     16	cgroup_fd = test__join_cgroup("/udp_limit");
     17	if (CHECK(cgroup_fd < 0, "cg-join", "errno %d", errno))
     18		return;
     19
     20	skel = udp_limit__open_and_load();
     21	if (CHECK(!skel, "skel-load", "errno %d", errno))
     22		goto close_cgroup_fd;
     23
     24	skel->links.sock = bpf_program__attach_cgroup(skel->progs.sock, cgroup_fd);
     25	if (!ASSERT_OK_PTR(skel->links.sock, "cg_attach_sock"))
     26		goto close_skeleton;
     27	skel->links.sock_release = bpf_program__attach_cgroup(skel->progs.sock_release, cgroup_fd);
     28	if (!ASSERT_OK_PTR(skel->links.sock_release, "cg_attach_sock_release"))
     29		goto close_skeleton;
     30
     31	/* BPF program enforces a single UDP socket per cgroup,
     32	 * verify that.
     33	 */
     34	fd1 = socket(AF_INET, SOCK_DGRAM, 0);
     35	if (CHECK(fd1 < 0, "fd1", "errno %d", errno))
     36		goto close_skeleton;
     37
     38	fd2 = socket(AF_INET, SOCK_DGRAM, 0);
     39	if (CHECK(fd2 >= 0, "fd2", "errno %d", errno))
     40		goto close_skeleton;
     41
     42	/* We can reopen again after close. */
     43	close(fd1);
     44	fd1 = -1;
     45
     46	fd1 = socket(AF_INET, SOCK_DGRAM, 0);
     47	if (CHECK(fd1 < 0, "fd1-again", "errno %d", errno))
     48		goto close_skeleton;
     49
     50	/* Make sure the program was invoked the expected
     51	 * number of times:
     52	 * - open fd1           - BPF_CGROUP_INET_SOCK_CREATE
     53	 * - attempt to openfd2 - BPF_CGROUP_INET_SOCK_CREATE
     54	 * - close fd1          - BPF_CGROUP_INET_SOCK_RELEASE
     55	 * - open fd1 again     - BPF_CGROUP_INET_SOCK_CREATE
     56	 */
     57	if (CHECK(skel->bss->invocations != 4, "bss-invocations",
     58		  "invocations=%d", skel->bss->invocations))
     59		goto close_skeleton;
     60
     61	/* We should still have a single socket in use */
     62	if (CHECK(skel->bss->in_use != 1, "bss-in_use",
     63		  "in_use=%d", skel->bss->in_use))
     64		goto close_skeleton;
     65
     66close_skeleton:
     67	if (fd1 >= 0)
     68		close(fd1);
     69	if (fd2 >= 0)
     70		close(fd2);
     71	udp_limit__destroy(skel);
     72close_cgroup_fd:
     73	close(cgroup_fd);
     74}