Commit 91134d84 authored by Martin KaFai Lau's avatar Martin KaFai Lau Committed by Daniel Borkmann

bpf: Test BPF_PROG_TYPE_SK_REUSEPORT

This patch add tests for the new BPF_PROG_TYPE_SK_REUSEPORT.

The tests cover:
- IPv4/IPv6 + TCP/UDP
- TCP syncookie
- TCP fastopen
- Cases when the bpf_sk_select_reuseport() returning errors
- Cases when the bpf prog returns SK_DROP
- Values from sk_reuseport_md
- outer_map => reuseport_array

The test depends on
commit 3eee1f75 ("bpf: fix bpf_skb_load_bytes_relative pkt length check")
Signed-off-by: default avatarMartin KaFai Lau <kafai@fb.com>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent 6bc8529c
......@@ -92,6 +92,7 @@ int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
attr.btf_key_type_id = create_attr->btf_key_type_id;
attr.btf_value_type_id = create_attr->btf_value_type_id;
attr.map_ifindex = create_attr->map_ifindex;
attr.inner_map_fd = create_attr->inner_map_fd;
return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
}
......
......@@ -39,6 +39,7 @@ struct bpf_create_map_attr {
__u32 btf_key_type_id;
__u32 btf_value_type_id;
__u32 map_ifindex;
__u32 inner_map_fd;
};
int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr);
......
......@@ -23,7 +23,7 @@ $(TEST_CUSTOM_PROGS): $(OUTPUT)/%: %.c
TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
test_align test_verifier_log test_dev_cgroup test_tcpbpf_user \
test_sock test_btf test_sockmap test_lirc_mode2_user get_cgroup_id_user \
test_socket_cookie test_cgroup_storage
test_socket_cookie test_cgroup_storage test_select_reuseport
TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test_obj_id.o \
test_pkt_md_access.o test_xdp_redirect.o test_xdp_meta.o sockmap_parse_prog.o \
......@@ -34,7 +34,7 @@ TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test
test_btf_haskv.o test_btf_nokv.o test_sockmap_kern.o test_tunnel_kern.o \
test_get_stack_rawtp.o test_sockmap_kern.o test_sockhash_kern.o \
test_lwt_seg6local.o sendmsg4_prog.o sendmsg6_prog.o test_lirc_mode2_kern.o \
get_cgroup_id_kern.o socket_cookie_prog.o
get_cgroup_id_kern.o socket_cookie_prog.o test_select_reuseport_kern.o
# Order correspond to 'make run_tests' order
TEST_PROGS := test_kmod.sh \
......
......@@ -111,6 +111,8 @@ static int (*bpf_xdp_adjust_tail)(void *ctx, int offset) =
static int (*bpf_skb_get_xfrm_state)(void *ctx, int index, void *state,
int size, int flags) =
(void *) BPF_FUNC_skb_get_xfrm_state;
static int (*bpf_sk_select_reuseport)(void *ctx, void *map, void *key, __u32 flags) =
(void *) BPF_FUNC_sk_select_reuseport;
static int (*bpf_get_stack)(void *ctx, void *buf, int size, int flags) =
(void *) BPF_FUNC_get_stack;
static int (*bpf_fib_lookup)(void *ctx, struct bpf_fib_lookup *params,
......@@ -173,6 +175,8 @@ struct bpf_map_def {
static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) =
(void *) BPF_FUNC_skb_load_bytes;
static int (*bpf_skb_load_bytes_relative)(void *ctx, int off, void *to, int len, __u32 start_header) =
(void *) BPF_FUNC_skb_load_bytes_relative;
static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
(void *) BPF_FUNC_skb_store_bytes;
static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
......
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018 Facebook */
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <fcntl.h>
#include <linux/bpf.h>
#include <linux/err.h>
#include <linux/types.h>
#include <linux/if_ether.h>
#include <sys/types.h>
#include <sys/epoll.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include "bpf_rlimit.h"
#include "bpf_util.h"
#include "test_select_reuseport_common.h"
#define MIN_TCPHDR_LEN 20
#define UDPHDR_LEN 8
#define TCP_SYNCOOKIE_SYSCTL "/proc/sys/net/ipv4/tcp_syncookies"
#define TCP_FO_SYSCTL "/proc/sys/net/ipv4/tcp_fastopen"
#define REUSEPORT_ARRAY_SIZE 32
static int result_map, tmp_index_ovr_map, linum_map, data_check_map;
static enum result expected_results[NR_RESULTS];
static int sk_fds[REUSEPORT_ARRAY_SIZE];
static int reuseport_array, outer_map;
static int select_by_skb_data_prog;
static int saved_tcp_syncookie;
static struct bpf_object *obj;
static int saved_tcp_fo;
static __u32 index_zero;
static int epfd;
static union sa46 {
struct sockaddr_in6 v6;
struct sockaddr_in v4;
sa_family_t family;
} srv_sa;
#define CHECK(condition, tag, format...) ({ \
int __ret = !!(condition); \
if (__ret) { \
printf("%s(%d):FAIL:%s ", __func__, __LINE__, tag); \
printf(format); \
exit(-1); \
} \
})
static void create_maps(void)
{
struct bpf_create_map_attr attr = {};
/* Creating reuseport_array */
attr.name = "reuseport_array";
attr.map_type = BPF_MAP_TYPE_REUSEPORT_SOCKARRAY;
attr.key_size = sizeof(__u32);
attr.value_size = sizeof(__u32);
attr.max_entries = REUSEPORT_ARRAY_SIZE;
reuseport_array = bpf_create_map_xattr(&attr);
CHECK(reuseport_array == -1, "creating reuseport_array",
"reuseport_array:%d errno:%d\n", reuseport_array, errno);
/* Creating outer_map */
attr.name = "outer_map";
attr.map_type = BPF_MAP_TYPE_ARRAY_OF_MAPS;
attr.key_size = sizeof(__u32);
attr.value_size = sizeof(__u32);
attr.max_entries = 1;
attr.inner_map_fd = reuseport_array;
outer_map = bpf_create_map_xattr(&attr);
CHECK(outer_map == -1, "creating outer_map",
"outer_map:%d errno:%d\n", outer_map, errno);
}
static void prepare_bpf_obj(void)
{
struct bpf_program *prog;
struct bpf_map *map;
int err;
struct bpf_object_open_attr attr = {
.file = "test_select_reuseport_kern.o",
.prog_type = BPF_PROG_TYPE_SK_REUSEPORT,
};
obj = bpf_object__open_xattr(&attr);
CHECK(IS_ERR_OR_NULL(obj), "open test_select_reuseport_kern.o",
"obj:%p PTR_ERR(obj):%ld\n", obj, PTR_ERR(obj));
prog = bpf_program__next(NULL, obj);
CHECK(!prog, "get first bpf_program", "!prog\n");
bpf_program__set_type(prog, attr.prog_type);
map = bpf_object__find_map_by_name(obj, "outer_map");
CHECK(!map, "find outer_map", "!map\n");
err = bpf_map__reuse_fd(map, outer_map);
CHECK(err, "reuse outer_map", "err:%d\n", err);
err = bpf_object__load(obj);
CHECK(err, "load bpf_object", "err:%d\n", err);
select_by_skb_data_prog = bpf_program__fd(prog);
CHECK(select_by_skb_data_prog == -1, "get prog fd",
"select_by_skb_data_prog:%d\n", select_by_skb_data_prog);
map = bpf_object__find_map_by_name(obj, "result_map");
CHECK(!map, "find result_map", "!map\n");
result_map = bpf_map__fd(map);
CHECK(result_map == -1, "get result_map fd",
"result_map:%d\n", result_map);
map = bpf_object__find_map_by_name(obj, "tmp_index_ovr_map");
CHECK(!map, "find tmp_index_ovr_map", "!map\n");
tmp_index_ovr_map = bpf_map__fd(map);
CHECK(tmp_index_ovr_map == -1, "get tmp_index_ovr_map fd",
"tmp_index_ovr_map:%d\n", tmp_index_ovr_map);
map = bpf_object__find_map_by_name(obj, "linum_map");
CHECK(!map, "find linum_map", "!map\n");
linum_map = bpf_map__fd(map);
CHECK(linum_map == -1, "get linum_map fd",
"linum_map:%d\n", linum_map);
map = bpf_object__find_map_by_name(obj, "data_check_map");
CHECK(!map, "find data_check_map", "!map\n");
data_check_map = bpf_map__fd(map);
CHECK(data_check_map == -1, "get data_check_map fd",
"data_check_map:%d\n", data_check_map);
}
static void sa46_init_loopback(union sa46 *sa, sa_family_t family)
{
memset(sa, 0, sizeof(*sa));
sa->family = family;
if (sa->family == AF_INET6)
sa->v6.sin6_addr = in6addr_loopback;
else
sa->v4.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
}
static void sa46_init_inany(union sa46 *sa, sa_family_t family)
{
memset(sa, 0, sizeof(*sa));
sa->family = family;
if (sa->family == AF_INET6)
sa->v6.sin6_addr = in6addr_any;
else
sa->v4.sin_addr.s_addr = INADDR_ANY;
}
static int read_int_sysctl(const char *sysctl)
{
char buf[16];
int fd, ret;
fd = open(sysctl, 0);
CHECK(fd == -1, "open(sysctl)", "sysctl:%s fd:%d errno:%d\n",
sysctl, fd, errno);
ret = read(fd, buf, sizeof(buf));
CHECK(ret <= 0, "read(sysctl)", "sysctl:%s ret:%d errno:%d\n",
sysctl, ret, errno);
close(fd);
return atoi(buf);
}
static void write_int_sysctl(const char *sysctl, int v)
{
int fd, ret, size;
char buf[16];
fd = open(sysctl, O_RDWR);
CHECK(fd == -1, "open(sysctl)", "sysctl:%s fd:%d errno:%d\n",
sysctl, fd, errno);
size = snprintf(buf, sizeof(buf), "%d", v);
ret = write(fd, buf, size);
CHECK(ret != size, "write(sysctl)",
"sysctl:%s ret:%d size:%d errno:%d\n", sysctl, ret, size, errno);
close(fd);
}
static void restore_sysctls(void)
{
write_int_sysctl(TCP_FO_SYSCTL, saved_tcp_fo);
write_int_sysctl(TCP_SYNCOOKIE_SYSCTL, saved_tcp_syncookie);
}
static void enable_fastopen(void)
{
int fo;
fo = read_int_sysctl(TCP_FO_SYSCTL);
write_int_sysctl(TCP_FO_SYSCTL, fo | 7);
}
static void enable_syncookie(void)
{
write_int_sysctl(TCP_SYNCOOKIE_SYSCTL, 2);
}
static void disable_syncookie(void)
{
write_int_sysctl(TCP_SYNCOOKIE_SYSCTL, 0);
}
static __u32 get_linum(void)
{
__u32 linum;
int err;
err = bpf_map_lookup_elem(linum_map, &index_zero, &linum);
CHECK(err == -1, "lookup_elem(linum_map)", "err:%d errno:%d\n",
err, errno);
return linum;
}
static void check_data(int type, sa_family_t family, const struct cmd *cmd,
int cli_fd)
{
struct data_check expected = {}, result;
union sa46 cli_sa;
socklen_t addrlen;
int err;
addrlen = sizeof(cli_sa);
err = getsockname(cli_fd, (struct sockaddr *)&cli_sa,
&addrlen);
CHECK(err == -1, "getsockname(cli_fd)", "err:%d errno:%d\n",
err, errno);
err = bpf_map_lookup_elem(data_check_map, &index_zero, &result);
CHECK(err == -1, "lookup_elem(data_check_map)", "err:%d errno:%d\n",
err, errno);
if (type == SOCK_STREAM) {
expected.len = MIN_TCPHDR_LEN;
expected.ip_protocol = IPPROTO_TCP;
} else {
expected.len = UDPHDR_LEN;
expected.ip_protocol = IPPROTO_UDP;
}
if (family == AF_INET6) {
expected.eth_protocol = htons(ETH_P_IPV6);
expected.bind_inany = !srv_sa.v6.sin6_addr.s6_addr32[3] &&
!srv_sa.v6.sin6_addr.s6_addr32[2] &&
!srv_sa.v6.sin6_addr.s6_addr32[1] &&
!srv_sa.v6.sin6_addr.s6_addr32[0];
memcpy(&expected.skb_addrs[0], cli_sa.v6.sin6_addr.s6_addr32,
sizeof(cli_sa.v6.sin6_addr));
memcpy(&expected.skb_addrs[4], &in6addr_loopback,
sizeof(in6addr_loopback));
expected.skb_ports[0] = cli_sa.v6.sin6_port;
expected.skb_ports[1] = srv_sa.v6.sin6_port;
} else {
expected.eth_protocol = htons(ETH_P_IP);
expected.bind_inany = !srv_sa.v4.sin_addr.s_addr;
expected.skb_addrs[0] = cli_sa.v4.sin_addr.s_addr;
expected.skb_addrs[1] = htonl(INADDR_LOOPBACK);
expected.skb_ports[0] = cli_sa.v4.sin_port;
expected.skb_ports[1] = srv_sa.v4.sin_port;
}
if (memcmp(&result, &expected, offsetof(struct data_check,
equal_check_end))) {
printf("unexpected data_check\n");
printf(" result: (0x%x, %u, %u)\n",
result.eth_protocol, result.ip_protocol,
result.bind_inany);
printf("expected: (0x%x, %u, %u)\n",
expected.eth_protocol, expected.ip_protocol,
expected.bind_inany);
CHECK(1, "data_check result != expected",
"bpf_prog_linum:%u\n", get_linum());
}
CHECK(!result.hash, "data_check result.hash empty",
"result.hash:%u", result.hash);
expected.len += cmd ? sizeof(*cmd) : 0;
if (type == SOCK_STREAM)
CHECK(expected.len > result.len, "expected.len > result.len",
"expected.len:%u result.len:%u bpf_prog_linum:%u\n",
expected.len, result.len, get_linum());
else
CHECK(expected.len != result.len, "expected.len != result.len",
"expected.len:%u result.len:%u bpf_prog_linum:%u\n",
expected.len, result.len, get_linum());
}
static void check_results(void)
{
__u32 results[NR_RESULTS];
__u32 i, broken = 0;
int err;
for (i = 0; i < NR_RESULTS; i++) {
err = bpf_map_lookup_elem(result_map, &i, &results[i]);
CHECK(err == -1, "lookup_elem(result_map)",
"i:%u err:%d errno:%d\n", i, err, errno);
}
for (i = 0; i < NR_RESULTS; i++) {
if (results[i] != expected_results[i]) {
broken = i;
break;
}
}
if (i == NR_RESULTS)
return;
printf("unexpected result\n");
printf(" result: [");
printf("%u", results[0]);
for (i = 1; i < NR_RESULTS; i++)
printf(", %u", results[i]);
printf("]\n");
printf("expected: [");
printf("%u", expected_results[0]);
for (i = 1; i < NR_RESULTS; i++)
printf(", %u", expected_results[i]);
printf("]\n");
CHECK(expected_results[broken] != results[broken],
"unexpected result",
"expected_results[%u] != results[%u] bpf_prog_linum:%u\n",
broken, broken, get_linum());
}
static int send_data(int type, sa_family_t family, void *data, size_t len,
enum result expected)
{
union sa46 cli_sa;
int fd, err;
fd = socket(family, type, 0);
CHECK(fd == -1, "socket()", "fd:%d errno:%d\n", fd, errno);
sa46_init_loopback(&cli_sa, family);
err = bind(fd, (struct sockaddr *)&cli_sa, sizeof(cli_sa));
CHECK(fd == -1, "bind(cli_sa)", "err:%d errno:%d\n", err, errno);
err = sendto(fd, data, len, MSG_FASTOPEN, (struct sockaddr *)&srv_sa,
sizeof(srv_sa));
CHECK(err != len && expected >= PASS,
"sendto()", "family:%u err:%d errno:%d expected:%d\n",
family, err, errno, expected);
return fd;
}
static void do_test(int type, sa_family_t family, struct cmd *cmd,
enum result expected)
{
int nev, srv_fd, cli_fd;
struct epoll_event ev;
struct cmd rcv_cmd;
ssize_t nread;
cli_fd = send_data(type, family, cmd, cmd ? sizeof(*cmd) : 0,
expected);
nev = epoll_wait(epfd, &ev, 1, expected >= PASS ? 5 : 0);
CHECK((nev <= 0 && expected >= PASS) ||
(nev > 0 && expected < PASS),
"nev <> expected",
"nev:%d expected:%d type:%d family:%d data:(%d, %d)\n",
nev, expected, type, family,
cmd ? cmd->reuseport_index : -1,
cmd ? cmd->pass_on_failure : -1);
check_results();
check_data(type, family, cmd, cli_fd);
if (expected < PASS)
return;
CHECK(expected != PASS_ERR_SK_SELECT_REUSEPORT &&
cmd->reuseport_index != ev.data.u32,
"check cmd->reuseport_index",
"cmd:(%u, %u) ev.data.u32:%u\n",
cmd->pass_on_failure, cmd->reuseport_index, ev.data.u32);
srv_fd = sk_fds[ev.data.u32];
if (type == SOCK_STREAM) {
int new_fd = accept(srv_fd, NULL, 0);
CHECK(new_fd == -1, "accept(srv_fd)",
"ev.data.u32:%u new_fd:%d errno:%d\n",
ev.data.u32, new_fd, errno);
nread = recv(new_fd, &rcv_cmd, sizeof(rcv_cmd), MSG_DONTWAIT);
CHECK(nread != sizeof(rcv_cmd),
"recv(new_fd)",
"ev.data.u32:%u nread:%zd sizeof(rcv_cmd):%zu errno:%d\n",
ev.data.u32, nread, sizeof(rcv_cmd), errno);
close(new_fd);
} else {
nread = recv(srv_fd, &rcv_cmd, sizeof(rcv_cmd), MSG_DONTWAIT);
CHECK(nread != sizeof(rcv_cmd),
"recv(sk_fds)",
"ev.data.u32:%u nread:%zd sizeof(rcv_cmd):%zu errno:%d\n",
ev.data.u32, nread, sizeof(rcv_cmd), errno);
}
close(cli_fd);
}
static void test_err_inner_map(int type, sa_family_t family)
{
struct cmd cmd = {
.reuseport_index = 0,
.pass_on_failure = 0,
};
printf("%s: ", __func__);
expected_results[DROP_ERR_INNER_MAP]++;
do_test(type, family, &cmd, DROP_ERR_INNER_MAP);
printf("OK\n");
}
static void test_err_skb_data(int type, sa_family_t family)
{
printf("%s: ", __func__);
expected_results[DROP_ERR_SKB_DATA]++;
do_test(type, family, NULL, DROP_ERR_SKB_DATA);
printf("OK\n");
}
static void test_err_sk_select_port(int type, sa_family_t family)
{
struct cmd cmd = {
.reuseport_index = REUSEPORT_ARRAY_SIZE,
.pass_on_failure = 0,
};
printf("%s: ", __func__);
expected_results[DROP_ERR_SK_SELECT_REUSEPORT]++;
do_test(type, family, &cmd, DROP_ERR_SK_SELECT_REUSEPORT);
printf("OK\n");
}
static void test_pass(int type, sa_family_t family)
{
struct cmd cmd;
int i;
printf("%s: ", __func__);
cmd.pass_on_failure = 0;
for (i = 0; i < REUSEPORT_ARRAY_SIZE; i++) {
expected_results[PASS]++;
cmd.reuseport_index = i;
do_test(type, family, &cmd, PASS);
}
printf("OK\n");
}
static void test_syncookie(int type, sa_family_t family)
{
int err, tmp_index = 1;
struct cmd cmd = {
.reuseport_index = 0,
.pass_on_failure = 0,
};
if (type != SOCK_STREAM)
return;
printf("%s: ", __func__);
/*
* +1 for TCP-SYN and
* +1 for the TCP-ACK (ack the syncookie)
*/
expected_results[PASS] += 2;
enable_syncookie();
/*
* Simulate TCP-SYN and TCP-ACK are handled by two different sk:
* TCP-SYN: select sk_fds[tmp_index = 1] tmp_index is from the
* tmp_index_ovr_map
* TCP-ACK: select sk_fds[reuseport_index = 0] reuseport_index
* is from the cmd.reuseport_index
*/
err = bpf_map_update_elem(tmp_index_ovr_map, &index_zero,
&tmp_index, BPF_ANY);
CHECK(err == -1, "update_elem(tmp_index_ovr_map, 0, 1)",
"err:%d errno:%d\n", err, errno);
do_test(type, family, &cmd, PASS);
err = bpf_map_lookup_elem(tmp_index_ovr_map, &index_zero,
&tmp_index);
CHECK(err == -1 || tmp_index != -1,
"lookup_elem(tmp_index_ovr_map)",
"err:%d errno:%d tmp_index:%d\n",
err, errno, tmp_index);
disable_syncookie();
printf("OK\n");
}
static void test_pass_on_err(int type, sa_family_t family)
{
struct cmd cmd = {
.reuseport_index = REUSEPORT_ARRAY_SIZE,
.pass_on_failure = 1,
};
printf("%s: ", __func__);
expected_results[PASS_ERR_SK_SELECT_REUSEPORT] += 1;
do_test(type, family, &cmd, PASS_ERR_SK_SELECT_REUSEPORT);
printf("OK\n");
}
static void prepare_sk_fds(int type, sa_family_t family, bool inany)
{
const int first = REUSEPORT_ARRAY_SIZE - 1;
int i, err, optval = 1;
struct epoll_event ev;
socklen_t addrlen;
if (inany)
sa46_init_inany(&srv_sa, family);
else
sa46_init_loopback(&srv_sa, family);
addrlen = sizeof(srv_sa);
/*
* The sk_fds[] is filled from the back such that the order
* is exactly opposite to the (struct sock_reuseport *)reuse->socks[].
*/
for (i = first; i >= 0; i--) {
sk_fds[i] = socket(family, type, 0);
CHECK(sk_fds[i] == -1, "socket()", "sk_fds[%d]:%d errno:%d\n",
i, sk_fds[i], errno);
err = setsockopt(sk_fds[i], SOL_SOCKET, SO_REUSEPORT,
&optval, sizeof(optval));
CHECK(err == -1, "setsockopt(SO_REUSEPORT)",
"sk_fds[%d] err:%d errno:%d\n",
i, err, errno);
if (i == first) {
err = setsockopt(sk_fds[i], SOL_SOCKET,
SO_ATTACH_REUSEPORT_EBPF,
&select_by_skb_data_prog,
sizeof(select_by_skb_data_prog));
CHECK(err == -1, "setsockopt(SO_ATTACH_REUEPORT_EBPF)",
"err:%d errno:%d\n", err, errno);
}
err = bind(sk_fds[i], (struct sockaddr *)&srv_sa, addrlen);
CHECK(err == -1, "bind()", "sk_fds[%d] err:%d errno:%d\n",
i, err, errno);
if (type == SOCK_STREAM) {
err = listen(sk_fds[i], 10);
CHECK(err == -1, "listen()",
"sk_fds[%d] err:%d errno:%d\n",
i, err, errno);
}
err = bpf_map_update_elem(reuseport_array, &i, &sk_fds[i],
BPF_NOEXIST);
CHECK(err == -1, "update_elem(reuseport_array)",
"sk_fds[%d] err:%d errno:%d\n", i, err, errno);
if (i == first) {
socklen_t addrlen = sizeof(srv_sa);
err = getsockname(sk_fds[i], (struct sockaddr *)&srv_sa,
&addrlen);
CHECK(err == -1, "getsockname()",
"sk_fds[%d] err:%d errno:%d\n", i, err, errno);
}
}
epfd = epoll_create(1);
CHECK(epfd == -1, "epoll_create(1)",
"epfd:%d errno:%d\n", epfd, errno);
ev.events = EPOLLIN;
for (i = 0; i < REUSEPORT_ARRAY_SIZE; i++) {
ev.data.u32 = i;
err = epoll_ctl(epfd, EPOLL_CTL_ADD, sk_fds[i], &ev);
CHECK(err, "epoll_ctl(EPOLL_CTL_ADD)", "sk_fds[%d]\n", i);
}
}
static void setup_per_test(int type, unsigned short family, bool inany)
{
int ovr = -1, err;
prepare_sk_fds(type, family, inany);
err = bpf_map_update_elem(tmp_index_ovr_map, &index_zero, &ovr,
BPF_ANY);
CHECK(err == -1, "update_elem(tmp_index_ovr_map, 0, -1)",
"err:%d errno:%d\n", err, errno);
}
static void cleanup_per_test(void)
{
int i, err;
for (i = 0; i < REUSEPORT_ARRAY_SIZE; i++)
close(sk_fds[i]);
close(epfd);
err = bpf_map_delete_elem(outer_map, &index_zero);
CHECK(err == -1, "delete_elem(outer_map)",
"err:%d errno:%d\n", err, errno);
}
static void cleanup(void)
{
close(outer_map);
close(reuseport_array);
bpf_object__close(obj);
}
static void test_all(void)
{
/* Extra SOCK_STREAM to test bind_inany==true */
const int types[] = { SOCK_STREAM, SOCK_DGRAM, SOCK_STREAM };
const char * const type_strings[] = { "TCP", "UDP", "TCP" };
const char * const family_strings[] = { "IPv6", "IPv4" };
const unsigned short families[] = { AF_INET6, AF_INET };
const bool bind_inany[] = { false, false, true };
int t, f, err;
for (f = 0; f < ARRAY_SIZE(families); f++) {
unsigned short family = families[f];
for (t = 0; t < ARRAY_SIZE(types); t++) {
bool inany = bind_inany[t];
int type = types[t];
printf("######## %s/%s %s ########\n",
family_strings[f], type_strings[t],
inany ? " INANY " : "LOOPBACK");
setup_per_test(type, family, inany);
test_err_inner_map(type, family);
/* Install reuseport_array to the outer_map */
err = bpf_map_update_elem(outer_map, &index_zero,
&reuseport_array, BPF_ANY);
CHECK(err == -1, "update_elem(outer_map)",
"err:%d errno:%d\n", err, errno);
test_err_skb_data(type, family);
test_err_sk_select_port(type, family);
test_pass(type, family);
test_syncookie(type, family);
test_pass_on_err(type, family);
cleanup_per_test();
printf("\n");
}
}
}
int main(int argc, const char **argv)
{
create_maps();
prepare_bpf_obj();
saved_tcp_fo = read_int_sysctl(TCP_FO_SYSCTL);
saved_tcp_syncookie = read_int_sysctl(TCP_SYNCOOKIE_SYSCTL);
enable_fastopen();
disable_syncookie();
atexit(restore_sysctls);
test_all();
cleanup();
return 0;
}
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2018 Facebook */
#ifndef __TEST_SELECT_REUSEPORT_COMMON_H
#define __TEST_SELECT_REUSEPORT_COMMON_H
#include <linux/types.h>
enum result {
DROP_ERR_INNER_MAP,
DROP_ERR_SKB_DATA,
DROP_ERR_SK_SELECT_REUSEPORT,
DROP_MISC,
PASS,
PASS_ERR_SK_SELECT_REUSEPORT,
NR_RESULTS,
};
struct cmd {
__u32 reuseport_index;
__u32 pass_on_failure;
};
struct data_check {
__u32 ip_protocol;
__u32 skb_addrs[8];
__u16 skb_ports[2];
__u16 eth_protocol;
__u8 bind_inany;
__u8 equal_check_end[0];
__u32 len;
__u32 hash;
};
#endif
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018 Facebook */
#include <stdlib.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/bpf.h>
#include <linux/types.h>
#include <linux/if_ether.h>
#include "bpf_endian.h"
#include "bpf_helpers.h"
#include "test_select_reuseport_common.h"
int _version SEC("version") = 1;
#ifndef offsetof
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif
struct bpf_map_def SEC("maps") outer_map = {
.type = BPF_MAP_TYPE_ARRAY_OF_MAPS,
.key_size = sizeof(__u32),
.value_size = sizeof(__u32),
.max_entries = 1,
};
struct bpf_map_def SEC("maps") result_map = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(__u32),
.value_size = sizeof(__u32),
.max_entries = NR_RESULTS,
};
struct bpf_map_def SEC("maps") tmp_index_ovr_map = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(__u32),
.value_size = sizeof(int),
.max_entries = 1,
};
struct bpf_map_def SEC("maps") linum_map = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(__u32),
.value_size = sizeof(__u32),
.max_entries = 1,
};
struct bpf_map_def SEC("maps") data_check_map = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(__u32),
.value_size = sizeof(struct data_check),
.max_entries = 1,
};
#define GOTO_DONE(_result) ({ \
result = (_result); \
linum = __LINE__; \
goto done; \
})
SEC("select_by_skb_data")
int _select_by_skb_data(struct sk_reuseport_md *reuse_md)
{
__u32 linum, index = 0, flags = 0, index_zero = 0;
__u32 *result_cnt, *linum_value;
struct data_check data_check = {};
struct cmd *cmd, cmd_copy;
void *data, *data_end;
void *reuseport_array;
enum result result;
int *index_ovr;
int err;
data = reuse_md->data;
data_end = reuse_md->data_end;
data_check.len = reuse_md->len;
data_check.eth_protocol = reuse_md->eth_protocol;
data_check.ip_protocol = reuse_md->ip_protocol;
data_check.hash = reuse_md->hash;
data_check.bind_inany = reuse_md->bind_inany;
if (data_check.eth_protocol == bpf_htons(ETH_P_IP)) {
if (bpf_skb_load_bytes_relative(reuse_md,
offsetof(struct iphdr, saddr),
data_check.skb_addrs, 8,
BPF_HDR_START_NET))
GOTO_DONE(DROP_MISC);
} else {
if (bpf_skb_load_bytes_relative(reuse_md,
offsetof(struct ipv6hdr, saddr),
data_check.skb_addrs, 32,
BPF_HDR_START_NET))
GOTO_DONE(DROP_MISC);
}
/*
* The ip_protocol could be a compile time decision
* if the bpf_prog.o is dedicated to either TCP or
* UDP.
*
* Otherwise, reuse_md->ip_protocol or
* the protocol field in the iphdr can be used.
*/
if (data_check.ip_protocol == IPPROTO_TCP) {
struct tcphdr *th = data;
if (th + 1 > data_end)
GOTO_DONE(DROP_MISC);
data_check.skb_ports[0] = th->source;
data_check.skb_ports[1] = th->dest;
if ((th->doff << 2) + sizeof(*cmd) > data_check.len)
GOTO_DONE(DROP_ERR_SKB_DATA);
if (bpf_skb_load_bytes(reuse_md, th->doff << 2, &cmd_copy,
sizeof(cmd_copy)))
GOTO_DONE(DROP_MISC);
cmd = &cmd_copy;
} else if (data_check.ip_protocol == IPPROTO_UDP) {
struct udphdr *uh = data;
if (uh + 1 > data_end)
GOTO_DONE(DROP_MISC);
data_check.skb_ports[0] = uh->source;
data_check.skb_ports[1] = uh->dest;
if (sizeof(struct udphdr) + sizeof(*cmd) > data_check.len)
GOTO_DONE(DROP_ERR_SKB_DATA);
if (data + sizeof(struct udphdr) + sizeof(*cmd) > data_end) {
if (bpf_skb_load_bytes(reuse_md, sizeof(struct udphdr),
&cmd_copy, sizeof(cmd_copy)))
GOTO_DONE(DROP_MISC);
cmd = &cmd_copy;
} else {
cmd = data + sizeof(struct udphdr);
}
} else {
GOTO_DONE(DROP_MISC);
}
reuseport_array = bpf_map_lookup_elem(&outer_map, &index_zero);
if (!reuseport_array)
GOTO_DONE(DROP_ERR_INNER_MAP);
index = cmd->reuseport_index;
index_ovr = bpf_map_lookup_elem(&tmp_index_ovr_map, &index_zero);
if (!index_ovr)
GOTO_DONE(DROP_MISC);
if (*index_ovr != -1) {
index = *index_ovr;
*index_ovr = -1;
}
err = bpf_sk_select_reuseport(reuse_md, reuseport_array, &index,
flags);
if (!err)
GOTO_DONE(PASS);
if (cmd->pass_on_failure)
GOTO_DONE(PASS_ERR_SK_SELECT_REUSEPORT);
else
GOTO_DONE(DROP_ERR_SK_SELECT_REUSEPORT);
done:
result_cnt = bpf_map_lookup_elem(&result_map, &result);
if (!result_cnt)
return SK_DROP;
bpf_map_update_elem(&linum_map, &index_zero, &linum, BPF_ANY);
bpf_map_update_elem(&data_check_map, &index_zero, &data_check, BPF_ANY);
(*result_cnt)++;
return result < PASS ? SK_DROP : SK_PASS;
}
char _license[] SEC("license") = "GPL";
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