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selftests/bpf: Add selftests for netkit

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Add a bigger batch of test coverage to assert correct operation of
netkit devices and their BPF program management:

  # ./test_progs -t tc_netkit
  [...]
  [    1.166267] bpf_testmod: loading out-of-tree module taints kernel.
  [    1.166831] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel
  [    1.270957] tsc: Refined TSC clocksource calibration: 3407.988 MHz
  [    1.272579] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fc932722, max_idle_ns: 440795381586 ns
  [    1.275336] clocksource: Switched to clocksource tsc
  #257     tc_netkit_basic:OK
  #258     tc_netkit_device:OK
  #259     tc_netkit_multi_links:OK
  #260     tc_netkit_multi_opts:OK
  #261     tc_netkit_neigh_links:OK
  Summary: 5/0 PASSED, 0 SKIPPED, 0 FAILED
  [...]

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20231024214904.29825-8-daniel@iogearbox.net
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Daniel Borkmann 2023-10-24 23:49:04 +02:00 committed by Martin KaFai Lau
parent 51f1892b52
commit ace15f91e5
4 changed files with 705 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
tools/testing/selftests/bpf/config
View File

@ -71,6 +71,7 @@ CONFIG_NETFILTER_SYNPROXY=y
CONFIG_NETFILTER_XT_CONNMARK=y
CONFIG_NETFILTER_XT_MATCH_STATE=y
CONFIG_NETFILTER_XT_TARGET_CT=y
CONFIG_NETKIT=y
CONFIG_NF_CONNTRACK=y
CONFIG_NF_CONNTRACK_MARK=y
CONFIG_NF_DEFRAG_IPV4=y

4
tools/testing/selftests/bpf/prog_tests/tc_helpers.h
View File

@ -4,6 +4,10 @@
#define TC_HELPERS
#include <test_progs.h>
#ifndef loopback
# define loopback 1
#endif
static inline __u32 id_from_prog_fd(int fd)
{
struct bpf_prog_info prog_info = {};

687
tools/testing/selftests/bpf/prog_tests/tc_netkit.c Normal file
View File

@ -0,0 +1,687 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Isovalent */
#include <uapi/linux/if_link.h>
#include <net/if.h>
#include <test_progs.h>
#define netkit_peer "nk0"
#define netkit_name "nk1"
#define ping_addr_neigh 0x0a000002 /* 10.0.0.2 */
#define ping_addr_noneigh 0x0a000003 /* 10.0.0.3 */
#include "test_tc_link.skel.h"
#include "netlink_helpers.h"
#include "tc_helpers.h"
#define ICMP_ECHO 8
struct icmphdr {
__u8 type;
__u8 code;
__sum16 checksum;
struct {
__be16 id;
__be16 sequence;
} echo;
};
struct iplink_req {
struct nlmsghdr n;
struct ifinfomsg i;
char buf[1024];
};
static int create_netkit(int mode, int policy, int peer_policy, int *ifindex,
bool same_netns)
{
struct rtnl_handle rth = { .fd = -1 };
struct iplink_req req = {};
struct rtattr *linkinfo, *data;
const char *type = "netkit";
int err;
err = rtnl_open(&rth, 0);
if (!ASSERT_OK(err, "open_rtnetlink"))
return err;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL;
req.n.nlmsg_type = RTM_NEWLINK;
req.i.ifi_family = AF_UNSPEC;
addattr_l(&req.n, sizeof(req), IFLA_IFNAME, netkit_name,
strlen(netkit_name));
linkinfo = addattr_nest(&req.n, sizeof(req), IFLA_LINKINFO);
addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type, strlen(type));
data = addattr_nest(&req.n, sizeof(req), IFLA_INFO_DATA);
addattr32(&req.n, sizeof(req), IFLA_NETKIT_POLICY, policy);
addattr32(&req.n, sizeof(req), IFLA_NETKIT_PEER_POLICY, peer_policy);
addattr32(&req.n, sizeof(req), IFLA_NETKIT_MODE, mode);
addattr_nest_end(&req.n, data);
addattr_nest_end(&req.n, linkinfo);
err = rtnl_talk(&rth, &req.n, NULL);
ASSERT_OK(err, "talk_rtnetlink");
rtnl_close(&rth);
*ifindex = if_nametoindex(netkit_name);
ASSERT_GT(*ifindex, 0, "retrieve_ifindex");
ASSERT_OK(system("ip netns add foo"), "create netns");
ASSERT_OK(system("ip link set dev " netkit_name " up"),
"up primary");
ASSERT_OK(system("ip addr add dev " netkit_name " 10.0.0.1/24"),
"addr primary");
if (same_netns) {
ASSERT_OK(system("ip link set dev " netkit_peer " up"),
"up peer");
ASSERT_OK(system("ip addr add dev " netkit_peer " 10.0.0.2/24"),
"addr peer");
} else {
ASSERT_OK(system("ip link set " netkit_peer " netns foo"),
"move peer");
ASSERT_OK(system("ip netns exec foo ip link set dev "
netkit_peer " up"), "up peer");
ASSERT_OK(system("ip netns exec foo ip addr add dev "
netkit_peer " 10.0.0.2/24"), "addr peer");
}
return err;
}
static void destroy_netkit(void)
{
ASSERT_OK(system("ip link del dev " netkit_name), "del primary");
ASSERT_OK(system("ip netns del foo"), "delete netns");
ASSERT_EQ(if_nametoindex(netkit_name), 0, netkit_name "_ifindex");
}
static int __send_icmp(__u32 dest)
{
struct sockaddr_in addr;
struct icmphdr icmp;
int sock, ret;
ret = write_sysctl("/proc/sys/net/ipv4/ping_group_range", "0 0");
if (!ASSERT_OK(ret, "write_sysctl(net.ipv4.ping_group_range)"))
return ret;
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP);
if (!ASSERT_GE(sock, 0, "icmp_socket"))
return -errno;
ret = setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE,
netkit_name, strlen(netkit_name) + 1);
if (!ASSERT_OK(ret, "setsockopt(SO_BINDTODEVICE)"))
goto out;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(dest);
memset(&icmp, 0, sizeof(icmp));
icmp.type = ICMP_ECHO;
icmp.echo.id = 1234;
icmp.echo.sequence = 1;
ret = sendto(sock, &icmp, sizeof(icmp), 0,
(struct sockaddr *)&addr, sizeof(addr));
if (!ASSERT_GE(ret, 0, "icmp_sendto"))
ret = -errno;
else
ret = 0;
out:
close(sock);
return ret;
}
static int send_icmp(void)
{
return __send_icmp(ping_addr_neigh);
}
void serial_test_tc_netkit_basic(void)
{
LIBBPF_OPTS(bpf_prog_query_opts, optq);
LIBBPF_OPTS(bpf_netkit_opts, optl);
__u32 prog_ids[2], link_ids[2];
__u32 pid1, pid2, lid1, lid2;
struct test_tc_link *skel;
struct bpf_link *link;
int err, ifindex;
err = create_netkit(NETKIT_L2, NETKIT_PASS, NETKIT_PASS,
&ifindex, false);
if (err)
return;
skel = test_tc_link__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
goto cleanup;
ASSERT_EQ(bpf_program__set_expected_attach_type(skel->progs.tc1,
BPF_NETKIT_PRIMARY), 0, "tc1_attach_type");
ASSERT_EQ(bpf_program__set_expected_attach_type(skel->progs.tc2,
BPF_NETKIT_PEER), 0, "tc2_attach_type");
err = test_tc_link__load(skel);
if (!ASSERT_OK(err, "skel_load"))
goto cleanup;
pid1 = id_from_prog_fd(bpf_program__fd(skel->progs.tc1));
pid2 = id_from_prog_fd(bpf_program__fd(skel->progs.tc2));
ASSERT_NEQ(pid1, pid2, "prog_ids_1_2");
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PRIMARY, 0);
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PEER, 0);
ASSERT_EQ(skel->bss->seen_tc1, false, "seen_tc1");
ASSERT_EQ(skel->bss->seen_tc2, false, "seen_tc2");
link = bpf_program__attach_netkit(skel->progs.tc1, ifindex, &optl);
if (!ASSERT_OK_PTR(link, "link_attach"))
goto cleanup;
skel->links.tc1 = link;
lid1 = id_from_link_fd(bpf_link__fd(skel->links.tc1));
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PRIMARY, 1);
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PEER, 0);
optq.prog_ids = prog_ids;
optq.link_ids = link_ids;
memset(prog_ids, 0, sizeof(prog_ids));
memset(link_ids, 0, sizeof(link_ids));
optq.count = ARRAY_SIZE(prog_ids);
err = bpf_prog_query_opts(ifindex, BPF_NETKIT_PRIMARY, &optq);
if (!ASSERT_OK(err, "prog_query"))
goto cleanup;
ASSERT_EQ(optq.count, 1, "count");
ASSERT_EQ(optq.revision, 2, "revision");
ASSERT_EQ(optq.prog_ids[0], pid1, "prog_ids[0]");
ASSERT_EQ(optq.link_ids[0], lid1, "link_ids[0]");
ASSERT_EQ(optq.prog_ids[1], 0, "prog_ids[1]");
ASSERT_EQ(optq.link_ids[1], 0, "link_ids[1]");
tc_skel_reset_all_seen(skel);
ASSERT_EQ(send_icmp(), 0, "icmp_pkt");
ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
ASSERT_EQ(skel->bss->seen_tc2, false, "seen_tc2");
link = bpf_program__attach_netkit(skel->progs.tc2, ifindex, &optl);
if (!ASSERT_OK_PTR(link, "link_attach"))
goto cleanup;
skel->links.tc2 = link;
lid2 = id_from_link_fd(bpf_link__fd(skel->links.tc2));
ASSERT_NEQ(lid1, lid2, "link_ids_1_2");
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PRIMARY, 1);
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PEER, 1);
memset(prog_ids, 0, sizeof(prog_ids));
memset(link_ids, 0, sizeof(link_ids));
optq.count = ARRAY_SIZE(prog_ids);
err = bpf_prog_query_opts(ifindex, BPF_NETKIT_PEER, &optq);
if (!ASSERT_OK(err, "prog_query"))
goto cleanup;
ASSERT_EQ(optq.count, 1, "count");
ASSERT_EQ(optq.revision, 2, "revision");
ASSERT_EQ(optq.prog_ids[0], pid2, "prog_ids[0]");
ASSERT_EQ(optq.link_ids[0], lid2, "link_ids[0]");
ASSERT_EQ(optq.prog_ids[1], 0, "prog_ids[1]");
ASSERT_EQ(optq.link_ids[1], 0, "link_ids[1]");
tc_skel_reset_all_seen(skel);
ASSERT_EQ(send_icmp(), 0, "icmp_pkt");
ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
ASSERT_EQ(skel->bss->seen_tc2, true, "seen_tc2");
cleanup:
test_tc_link__destroy(skel);
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PRIMARY, 0);
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PEER, 0);
destroy_netkit();
}
static void serial_test_tc_netkit_multi_links_target(int mode, int target)
{
LIBBPF_OPTS(bpf_prog_query_opts, optq);
LIBBPF_OPTS(bpf_netkit_opts, optl);
__u32 prog_ids[3], link_ids[3];
__u32 pid1, pid2, lid1, lid2;
struct test_tc_link *skel;
struct bpf_link *link;
int err, ifindex;
err = create_netkit(mode, NETKIT_PASS, NETKIT_PASS,
&ifindex, false);
if (err)
return;
skel = test_tc_link__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
goto cleanup;
ASSERT_EQ(bpf_program__set_expected_attach_type(skel->progs.tc1,
target), 0, "tc1_attach_type");
ASSERT_EQ(bpf_program__set_expected_attach_type(skel->progs.tc2,
target), 0, "tc2_attach_type");
err = test_tc_link__load(skel);
if (!ASSERT_OK(err, "skel_load"))
goto cleanup;
pid1 = id_from_prog_fd(bpf_program__fd(skel->progs.tc1));
pid2 = id_from_prog_fd(bpf_program__fd(skel->progs.tc2));
ASSERT_NEQ(pid1, pid2, "prog_ids_1_2");
assert_mprog_count_ifindex(ifindex, target, 0);
ASSERT_EQ(skel->bss->seen_tc1, false, "seen_tc1");
ASSERT_EQ(skel->bss->seen_eth, false, "seen_eth");
ASSERT_EQ(skel->bss->seen_tc2, false, "seen_tc2");
link = bpf_program__attach_netkit(skel->progs.tc1, ifindex, &optl);
if (!ASSERT_OK_PTR(link, "link_attach"))
goto cleanup;
skel->links.tc1 = link;
lid1 = id_from_link_fd(bpf_link__fd(skel->links.tc1));
assert_mprog_count_ifindex(ifindex, target, 1);
optq.prog_ids = prog_ids;
optq.link_ids = link_ids;
memset(prog_ids, 0, sizeof(prog_ids));
memset(link_ids, 0, sizeof(link_ids));
optq.count = ARRAY_SIZE(prog_ids);
err = bpf_prog_query_opts(ifindex, target, &optq);
if (!ASSERT_OK(err, "prog_query"))
goto cleanup;
ASSERT_EQ(optq.count, 1, "count");
ASSERT_EQ(optq.revision, 2, "revision");
ASSERT_EQ(optq.prog_ids[0], pid1, "prog_ids[0]");
ASSERT_EQ(optq.link_ids[0], lid1, "link_ids[0]");
ASSERT_EQ(optq.prog_ids[1], 0, "prog_ids[1]");
ASSERT_EQ(optq.link_ids[1], 0, "link_ids[1]");
tc_skel_reset_all_seen(skel);
ASSERT_EQ(send_icmp(), 0, "icmp_pkt");
ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
ASSERT_EQ(skel->bss->seen_eth, true, "seen_eth");
ASSERT_EQ(skel->bss->seen_tc2, false, "seen_tc2");
LIBBPF_OPTS_RESET(optl,
.flags = BPF_F_BEFORE,
.relative_fd = bpf_program__fd(skel->progs.tc1),
);
link = bpf_program__attach_netkit(skel->progs.tc2, ifindex, &optl);
if (!ASSERT_OK_PTR(link, "link_attach"))
goto cleanup;
skel->links.tc2 = link;
lid2 = id_from_link_fd(bpf_link__fd(skel->links.tc2));
ASSERT_NEQ(lid1, lid2, "link_ids_1_2");
assert_mprog_count_ifindex(ifindex, target, 2);
memset(prog_ids, 0, sizeof(prog_ids));
memset(link_ids, 0, sizeof(link_ids));
optq.count = ARRAY_SIZE(prog_ids);
err = bpf_prog_query_opts(ifindex, target, &optq);
if (!ASSERT_OK(err, "prog_query"))
goto cleanup;
ASSERT_EQ(optq.count, 2, "count");
ASSERT_EQ(optq.revision, 3, "revision");
ASSERT_EQ(optq.prog_ids[0], pid2, "prog_ids[0]");
ASSERT_EQ(optq.link_ids[0], lid2, "link_ids[0]");
ASSERT_EQ(optq.prog_ids[1], pid1, "prog_ids[1]");
ASSERT_EQ(optq.link_ids[1], lid1, "link_ids[1]");
ASSERT_EQ(optq.prog_ids[2], 0, "prog_ids[2]");
ASSERT_EQ(optq.link_ids[2], 0, "link_ids[2]");
tc_skel_reset_all_seen(skel);
ASSERT_EQ(send_icmp(), 0, "icmp_pkt");
ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
ASSERT_EQ(skel->bss->seen_eth, true, "seen_eth");
ASSERT_EQ(skel->bss->seen_tc2, true, "seen_tc2");
cleanup:
test_tc_link__destroy(skel);
assert_mprog_count_ifindex(ifindex, target, 0);
destroy_netkit();
}
void serial_test_tc_netkit_multi_links(void)
{
serial_test_tc_netkit_multi_links_target(NETKIT_L2, BPF_NETKIT_PRIMARY);
serial_test_tc_netkit_multi_links_target(NETKIT_L3, BPF_NETKIT_PRIMARY);
serial_test_tc_netkit_multi_links_target(NETKIT_L2, BPF_NETKIT_PEER);
serial_test_tc_netkit_multi_links_target(NETKIT_L3, BPF_NETKIT_PEER);
}
static void serial_test_tc_netkit_multi_opts_target(int mode, int target)
{
LIBBPF_OPTS(bpf_prog_attach_opts, opta);
LIBBPF_OPTS(bpf_prog_detach_opts, optd);
LIBBPF_OPTS(bpf_prog_query_opts, optq);
__u32 pid1, pid2, fd1, fd2;
__u32 prog_ids[3];
struct test_tc_link *skel;
int err, ifindex;
err = create_netkit(mode, NETKIT_PASS, NETKIT_PASS,
&ifindex, false);
if (err)
return;
skel = test_tc_link__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_load"))
goto cleanup;
fd1 = bpf_program__fd(skel->progs.tc1);
fd2 = bpf_program__fd(skel->progs.tc2);
pid1 = id_from_prog_fd(fd1);
pid2 = id_from_prog_fd(fd2);
ASSERT_NEQ(pid1, pid2, "prog_ids_1_2");
assert_mprog_count_ifindex(ifindex, target, 0);
ASSERT_EQ(skel->bss->seen_tc1, false, "seen_tc1");
ASSERT_EQ(skel->bss->seen_eth, false, "seen_eth");
ASSERT_EQ(skel->bss->seen_tc2, false, "seen_tc2");
err = bpf_prog_attach_opts(fd1, ifindex, target, &opta);
if (!ASSERT_EQ(err, 0, "prog_attach"))
goto cleanup;
assert_mprog_count_ifindex(ifindex, target, 1);
optq.prog_ids = prog_ids;
memset(prog_ids, 0, sizeof(prog_ids));
optq.count = ARRAY_SIZE(prog_ids);
err = bpf_prog_query_opts(ifindex, target, &optq);
if (!ASSERT_OK(err, "prog_query"))
goto cleanup_fd1;
ASSERT_EQ(optq.count, 1, "count");
ASSERT_EQ(optq.revision, 2, "revision");
ASSERT_EQ(optq.prog_ids[0], pid1, "prog_ids[0]");
ASSERT_EQ(optq.prog_ids[1], 0, "prog_ids[1]");
tc_skel_reset_all_seen(skel);
ASSERT_EQ(send_icmp(), 0, "icmp_pkt");
ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
ASSERT_EQ(skel->bss->seen_eth, true, "seen_eth");
ASSERT_EQ(skel->bss->seen_tc2, false, "seen_tc2");
LIBBPF_OPTS_RESET(opta,
.flags = BPF_F_BEFORE,
.relative_fd = fd1,
);
err = bpf_prog_attach_opts(fd2, ifindex, target, &opta);
if (!ASSERT_EQ(err, 0, "prog_attach"))
goto cleanup_fd1;
assert_mprog_count_ifindex(ifindex, target, 2);
memset(prog_ids, 0, sizeof(prog_ids));
optq.count = ARRAY_SIZE(prog_ids);
err = bpf_prog_query_opts(ifindex, target, &optq);
if (!ASSERT_OK(err, "prog_query"))
goto cleanup_fd2;
ASSERT_EQ(optq.count, 2, "count");
ASSERT_EQ(optq.revision, 3, "revision");
ASSERT_EQ(optq.prog_ids[0], pid2, "prog_ids[0]");
ASSERT_EQ(optq.prog_ids[1], pid1, "prog_ids[1]");
ASSERT_EQ(optq.prog_ids[2], 0, "prog_ids[2]");
tc_skel_reset_all_seen(skel);
ASSERT_EQ(send_icmp(), 0, "icmp_pkt");
ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
ASSERT_EQ(skel->bss->seen_eth, true, "seen_eth");
ASSERT_EQ(skel->bss->seen_tc2, true, "seen_tc2");
cleanup_fd2:
err = bpf_prog_detach_opts(fd2, ifindex, target, &optd);
ASSERT_OK(err, "prog_detach");
assert_mprog_count_ifindex(ifindex, target, 1);
cleanup_fd1:
err = bpf_prog_detach_opts(fd1, ifindex, target, &optd);
ASSERT_OK(err, "prog_detach");
assert_mprog_count_ifindex(ifindex, target, 0);
cleanup:
test_tc_link__destroy(skel);
assert_mprog_count_ifindex(ifindex, target, 0);
destroy_netkit();
}
void serial_test_tc_netkit_multi_opts(void)
{
serial_test_tc_netkit_multi_opts_target(NETKIT_L2, BPF_NETKIT_PRIMARY);
serial_test_tc_netkit_multi_opts_target(NETKIT_L3, BPF_NETKIT_PRIMARY);
serial_test_tc_netkit_multi_opts_target(NETKIT_L2, BPF_NETKIT_PEER);
serial_test_tc_netkit_multi_opts_target(NETKIT_L3, BPF_NETKIT_PEER);
}
void serial_test_tc_netkit_device(void)
{
LIBBPF_OPTS(bpf_prog_query_opts, optq);
LIBBPF_OPTS(bpf_netkit_opts, optl);
__u32 prog_ids[2], link_ids[2];
__u32 pid1, pid2, lid1;
struct test_tc_link *skel;
struct bpf_link *link;
int err, ifindex, ifindex2;
err = create_netkit(NETKIT_L3, NETKIT_PASS, NETKIT_PASS,
&ifindex, true);
if (err)
return;
ifindex2 = if_nametoindex(netkit_peer);
ASSERT_NEQ(ifindex, ifindex2, "ifindex_1_2");
skel = test_tc_link__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
goto cleanup;
ASSERT_EQ(bpf_program__set_expected_attach_type(skel->progs.tc1,
BPF_NETKIT_PRIMARY), 0, "tc1_attach_type");
ASSERT_EQ(bpf_program__set_expected_attach_type(skel->progs.tc2,
BPF_NETKIT_PEER), 0, "tc2_attach_type");
ASSERT_EQ(bpf_program__set_expected_attach_type(skel->progs.tc3,
BPF_NETKIT_PRIMARY), 0, "tc3_attach_type");
err = test_tc_link__load(skel);
if (!ASSERT_OK(err, "skel_load"))
goto cleanup;
pid1 = id_from_prog_fd(bpf_program__fd(skel->progs.tc1));
pid2 = id_from_prog_fd(bpf_program__fd(skel->progs.tc2));
ASSERT_NEQ(pid1, pid2, "prog_ids_1_2");
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PRIMARY, 0);
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PEER, 0);
ASSERT_EQ(skel->bss->seen_tc1, false, "seen_tc1");
ASSERT_EQ(skel->bss->seen_tc2, false, "seen_tc2");
link = bpf_program__attach_netkit(skel->progs.tc1, ifindex, &optl);
if (!ASSERT_OK_PTR(link, "link_attach"))
goto cleanup;
skel->links.tc1 = link;
lid1 = id_from_link_fd(bpf_link__fd(skel->links.tc1));
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PRIMARY, 1);
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PEER, 0);
optq.prog_ids = prog_ids;
optq.link_ids = link_ids;
memset(prog_ids, 0, sizeof(prog_ids));
memset(link_ids, 0, sizeof(link_ids));
optq.count = ARRAY_SIZE(prog_ids);
err = bpf_prog_query_opts(ifindex, BPF_NETKIT_PRIMARY, &optq);
if (!ASSERT_OK(err, "prog_query"))
goto cleanup;
ASSERT_EQ(optq.count, 1, "count");
ASSERT_EQ(optq.revision, 2, "revision");
ASSERT_EQ(optq.prog_ids[0], pid1, "prog_ids[0]");
ASSERT_EQ(optq.link_ids[0], lid1, "link_ids[0]");
ASSERT_EQ(optq.prog_ids[1], 0, "prog_ids[1]");
ASSERT_EQ(optq.link_ids[1], 0, "link_ids[1]");
tc_skel_reset_all_seen(skel);
ASSERT_EQ(send_icmp(), 0, "icmp_pkt");
ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
ASSERT_EQ(skel->bss->seen_tc2, false, "seen_tc2");
memset(prog_ids, 0, sizeof(prog_ids));
memset(link_ids, 0, sizeof(link_ids));
optq.count = ARRAY_SIZE(prog_ids);
err = bpf_prog_query_opts(ifindex2, BPF_NETKIT_PRIMARY, &optq);
ASSERT_EQ(err, -EACCES, "prog_query_should_fail");
err = bpf_prog_query_opts(ifindex2, BPF_NETKIT_PEER, &optq);
ASSERT_EQ(err, -EACCES, "prog_query_should_fail");
link = bpf_program__attach_netkit(skel->progs.tc2, ifindex2, &optl);
if (!ASSERT_ERR_PTR(link, "link_attach_should_fail")) {
bpf_link__destroy(link);
goto cleanup;
}
link = bpf_program__attach_netkit(skel->progs.tc3, ifindex2, &optl);
if (!ASSERT_ERR_PTR(link, "link_attach_should_fail")) {
bpf_link__destroy(link);
goto cleanup;
}
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PRIMARY, 1);
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PEER, 0);
cleanup:
test_tc_link__destroy(skel);
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PRIMARY, 0);
assert_mprog_count_ifindex(ifindex, BPF_NETKIT_PEER, 0);
destroy_netkit();
}
static void serial_test_tc_netkit_neigh_links_target(int mode, int target)
{
LIBBPF_OPTS(bpf_prog_query_opts, optq);
LIBBPF_OPTS(bpf_netkit_opts, optl);
__u32 prog_ids[2], link_ids[2];
__u32 pid1, lid1;
struct test_tc_link *skel;
struct bpf_link *link;
int err, ifindex;
err = create_netkit(mode, NETKIT_PASS, NETKIT_PASS,
&ifindex, false);
if (err)
return;
skel = test_tc_link__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
goto cleanup;
ASSERT_EQ(bpf_program__set_expected_attach_type(skel->progs.tc1,
BPF_NETKIT_PRIMARY), 0, "tc1_attach_type");
err = test_tc_link__load(skel);
if (!ASSERT_OK(err, "skel_load"))
goto cleanup;
pid1 = id_from_prog_fd(bpf_program__fd(skel->progs.tc1));
assert_mprog_count_ifindex(ifindex, target, 0);
ASSERT_EQ(skel->bss->seen_tc1, false, "seen_tc1");
ASSERT_EQ(skel->bss->seen_eth, false, "seen_eth");
link = bpf_program__attach_netkit(skel->progs.tc1, ifindex, &optl);
if (!ASSERT_OK_PTR(link, "link_attach"))
goto cleanup;
skel->links.tc1 = link;
lid1 = id_from_link_fd(bpf_link__fd(skel->links.tc1));
assert_mprog_count_ifindex(ifindex, target, 1);
optq.prog_ids = prog_ids;
optq.link_ids = link_ids;
memset(prog_ids, 0, sizeof(prog_ids));
memset(link_ids, 0, sizeof(link_ids));
optq.count = ARRAY_SIZE(prog_ids);
err = bpf_prog_query_opts(ifindex, target, &optq);
if (!ASSERT_OK(err, "prog_query"))
goto cleanup;
ASSERT_EQ(optq.count, 1, "count");
ASSERT_EQ(optq.revision, 2, "revision");
ASSERT_EQ(optq.prog_ids[0], pid1, "prog_ids[0]");
ASSERT_EQ(optq.link_ids[0], lid1, "link_ids[0]");
ASSERT_EQ(optq.prog_ids[1], 0, "prog_ids[1]");
ASSERT_EQ(optq.link_ids[1], 0, "link_ids[1]");
tc_skel_reset_all_seen(skel);
ASSERT_EQ(__send_icmp(ping_addr_noneigh), 0, "icmp_pkt");
ASSERT_EQ(skel->bss->seen_tc1, true /* L2: ARP */, "seen_tc1");
ASSERT_EQ(skel->bss->seen_eth, mode == NETKIT_L3, "seen_eth");
cleanup:
test_tc_link__destroy(skel);
assert_mprog_count_ifindex(ifindex, target, 0);
destroy_netkit();
}
void serial_test_tc_netkit_neigh_links(void)
{
serial_test_tc_netkit_neigh_links_target(NETKIT_L2, BPF_NETKIT_PRIMARY);
serial_test_tc_netkit_neigh_links_target(NETKIT_L3, BPF_NETKIT_PRIMARY);
}

13
tools/testing/selftests/bpf/progs/test_tc_link.c
View File

@ -1,7 +1,11 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Isovalent */
#include <stdbool.h>
#include <linux/bpf.h>
#include <linux/if_ether.h>
#include <bpf/bpf_endian.h>
#include <bpf/bpf_helpers.h>
char LICENSE[] SEC("license") = "GPL";
@ -12,10 +16,19 @@ bool seen_tc3;
bool seen_tc4;
bool seen_tc5;
bool seen_tc6;
bool seen_eth;
SEC("tc/ingress")
int tc1(struct __sk_buff *skb)
{
struct ethhdr eth = {};
if (skb->protocol != __bpf_constant_htons(ETH_P_IP))
goto out;
if (bpf_skb_load_bytes(skb, 0, &eth, sizeof(eth)))
goto out;
seen_eth = eth.h_proto == bpf_htons(ETH_P_IP);
out:
seen_tc1 = true;
return TCX_NEXT;
}