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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2022 Google LLC.
*/
#define _GNU_SOURCE
#include <sys/mount.h>
#include "test_progs.h"
#include "cgroup_helpers.h"
#include "network_helpers.h"
#include "connect_ping.skel.h"
/* 2001:db8::1 */
#define BINDADDR_V6 { { { 0x20,0x01,0x0d,0xb8,0,0,0,0,0,0,0,0,0,0,0,1 } } }
static const struct in6_addr bindaddr_v6 = BINDADDR_V6;
static void subtest(int cgroup_fd, struct connect_ping *skel,
int family, int do_bind)
{
struct sockaddr_in sa4 = {
.sin_family = AF_INET,
.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
};
struct sockaddr_in6 sa6 = {
.sin6_family = AF_INET6,
.sin6_addr = IN6ADDR_LOOPBACK_INIT,
};
struct sockaddr *sa;
socklen_t sa_len;
int protocol;
int sock_fd;
switch (family) {
case AF_INET:
sa = (struct sockaddr *)&sa4;
sa_len = sizeof(sa4);
protocol = IPPROTO_ICMP;
break;
case AF_INET6:
sa = (struct sockaddr *)&sa6;
sa_len = sizeof(sa6);
protocol = IPPROTO_ICMPV6;
break;
}
memset(skel->bss, 0, sizeof(*skel->bss));
skel->bss->do_bind = do_bind;
sock_fd = socket(family, SOCK_DGRAM, protocol);
if (!ASSERT_GE(sock_fd, 0, "sock-create"))
return;
if (!ASSERT_OK(connect(sock_fd, sa, sa_len), "connect"))
goto close_sock;
if (!ASSERT_EQ(skel->bss->invocations_v4, family == AF_INET ? 1 : 0,
"invocations_v4"))
goto close_sock;
if (!ASSERT_EQ(skel->bss->invocations_v6, family == AF_INET6 ? 1 : 0,
"invocations_v6"))
goto close_sock;
if (!ASSERT_EQ(skel->bss->has_error, 0, "has_error"))
goto close_sock;
if (!ASSERT_OK(getsockname(sock_fd, sa, &sa_len),
"getsockname"))
goto close_sock;
switch (family) {
case AF_INET:
if (!ASSERT_EQ(sa4.sin_family, family, "sin_family"))
goto close_sock;
if (!ASSERT_EQ(sa4.sin_addr.s_addr,
htonl(do_bind ? 0x01010101 : INADDR_LOOPBACK),
"sin_addr"))
goto close_sock;
break;
case AF_INET6:
if (!ASSERT_EQ(sa6.sin6_family, AF_INET6, "sin6_family"))
goto close_sock;
if (!ASSERT_EQ(memcmp(&sa6.sin6_addr,
do_bind ? &bindaddr_v6 : &in6addr_loopback,
sizeof(sa6.sin6_addr)),
0, "sin6_addr"))
goto close_sock;
break;
}
close_sock:
close(sock_fd);
}
void test_connect_ping(void)
{
struct connect_ping *skel;
int cgroup_fd;
if (!ASSERT_OK(unshare(CLONE_NEWNET | CLONE_NEWNS), "unshare"))
return;
/* overmount sysfs, and making original sysfs private so overmount
* does not propagate to other mntns.
*/
if (!ASSERT_OK(mount("none", "/sys", NULL, MS_PRIVATE, NULL),
"remount-private-sys"))
return;
if (!ASSERT_OK(mount("sysfs", "/sys", "sysfs", 0, NULL),
"mount-sys"))
return;
if (!ASSERT_OK(mount("bpffs", "/sys/fs/bpf", "bpf", 0, NULL),
"mount-bpf"))
goto clean_mount;
if (!ASSERT_OK(system("ip link set dev lo up"), "lo-up"))
goto clean_mount;
if (!ASSERT_OK(system("ip addr add 1.1.1.1 dev lo"), "lo-addr-v4"))
goto clean_mount;
if (!ASSERT_OK(system("ip -6 addr add 2001:db8::1 dev lo"), "lo-addr-v6"))
goto clean_mount;
if (write_sysctl("/proc/sys/net/ipv4/ping_group_range", "0 0"))
goto clean_mount;
cgroup_fd = test__join_cgroup("/connect_ping");
if (!ASSERT_GE(cgroup_fd, 0, "cg-create"))
goto clean_mount;
skel = connect_ping__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel-load"))
goto close_cgroup;
skel->links.connect_v4_prog =
bpf_program__attach_cgroup(skel->progs.connect_v4_prog, cgroup_fd);
if (!ASSERT_OK_PTR(skel->links.connect_v4_prog, "cg-attach-v4"))
goto skel_destroy;
skel->links.connect_v6_prog =
bpf_program__attach_cgroup(skel->progs.connect_v6_prog, cgroup_fd);
if (!ASSERT_OK_PTR(skel->links.connect_v6_prog, "cg-attach-v6"))
goto skel_destroy;
/* Connect a v4 ping socket to localhost, assert that only v4 is called,
* and called exactly once, and that the socket's bound address is
* original loopback address.
*/
if (test__start_subtest("ipv4"))
subtest(cgroup_fd, skel, AF_INET, 0);
/* Connect a v4 ping socket to localhost, assert that only v4 is called,
* and called exactly once, and that the socket's bound address is
* address we explicitly bound.
*/
if (test__start_subtest("ipv4-bind"))
subtest(cgroup_fd, skel, AF_INET, 1);
/* Connect a v6 ping socket to localhost, assert that only v6 is called,
* and called exactly once, and that the socket's bound address is
* original loopback address.
*/
if (test__start_subtest("ipv6"))
subtest(cgroup_fd, skel, AF_INET6, 0);
/* Connect a v6 ping socket to localhost, assert that only v6 is called,
* and called exactly once, and that the socket's bound address is
* address we explicitly bound.
*/
if (test__start_subtest("ipv6-bind"))
subtest(cgroup_fd, skel, AF_INET6, 1);
skel_destroy:
connect_ping__destroy(skel);
close_cgroup:
close(cgroup_fd);
clean_mount:
umount2("/sys", MNT_DETACH);
}
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