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bpf: selftest: Adapt sock_fields test to use skel and global variables 

skel is used.

Global variables are used to store the result from bpf prog.
addr_map, sock_result_map, and tcp_sock_result_map are gone.
Instead, global variables listen_tp, srv_sa6, cli_tp,, srv_tp,
listen_sk, srv_sk, and cli_sk are added.
Because of that, bpf_addr_array_idx and bpf_result_array_idx are also
no longer needed.

CHECK() macro from test_progs.h is reused and bail as soon as
a CHECK failure.

shutdown() is used to ensure the previous data-ack is received.
The bytes_acked, bytes_received, and the pkt_out_cnt checks are
using "<" to accommodate the final ack may not have been received/sent.
It is enough since it is not the focus of this test.

The sk local storage is all initialized to 0xeB9F now, so the
check_sk_pkt_out_cnt() always checks with the 0xeB9F base.  It is to
keep things simple.

The next patch will reuse helpers from network_helpers.h to simplify
things further.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200925000434.3858204-1-kafai@fb.com
This commit is contained in:
Martin KaFai Lau 2020-09-24 17:04:34 -07:00 committed by Alexei Starovoitov
parent 6f521a2bd2
commit b18c1f0aa4
2 changed files with 226 additions and 302 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

366
tools/testing/selftests/bpf/prog_tests/sock_fields.c
View File

@ -14,20 +14,9 @@
#include <bpf/libbpf.h>
#include "cgroup_helpers.h"
#include "test_progs.h"
#include "bpf_rlimit.h"
enum bpf_addr_array_idx {
ADDR_SRV_IDX,
ADDR_CLI_IDX,
__NR_BPF_ADDR_ARRAY_IDX,
};
enum bpf_result_array_idx {
EGRESS_SRV_IDX,
EGRESS_CLI_IDX,
INGRESS_LISTEN_IDX,
__NR_BPF_RESULT_ARRAY_IDX,
};
#include "test_sock_fields.skel.h"
enum bpf_linum_array_idx {
EGRESS_LINUM_IDX,
@ -40,34 +29,16 @@ struct bpf_spinlock_cnt {
__u32 cnt;
};
#define CHECK(condition, tag, format...) ({ \
int __ret = !!(condition); \
if (__ret) { \
printf("%s(%d):FAIL:%s ", __func__, __LINE__, tag); \
printf(format); \
printf("\n"); \
exit(-1); \
} \
})
#define TEST_CGROUP "/test-bpf-sock-fields"
#define DATA "Hello BPF!"
#define DATA_LEN sizeof(DATA)
static struct sockaddr_in6 srv_sa6, cli_sa6;
static int sk_pkt_out_cnt10_fd;
struct test_sock_fields *skel;
static int sk_pkt_out_cnt_fd;
static int linum_map_fd;
static int addr_map_fd;
static int tp_map_fd;
static int sk_map_fd;
static __u32 addr_srv_idx = ADDR_SRV_IDX;
static __u32 addr_cli_idx = ADDR_CLI_IDX;
static __u32 egress_srv_idx = EGRESS_SRV_IDX;
static __u32 egress_cli_idx = EGRESS_CLI_IDX;
static __u32 ingress_listen_idx = INGRESS_LISTEN_IDX;
static __u32 duration;
static __u32 egress_linum_idx = EGRESS_LINUM_IDX;
static __u32 ingress_linum_idx = INGRESS_LINUM_IDX;
@ -79,7 +50,7 @@ static void init_loopback6(struct sockaddr_in6 *sa6)
sa6->sin6_addr = in6addr_loopback;
}
static void print_sk(const struct bpf_sock *sk)
static void print_sk(const struct bpf_sock *sk, const char *prefix)
{
char src_ip4[24], dst_ip4[24];
char src_ip6[64], dst_ip6[64];
@ -89,9 +60,10 @@ static void print_sk(const struct bpf_sock *sk)
inet_ntop(AF_INET, &sk->dst_ip4, dst_ip4, sizeof(dst_ip4));
inet_ntop(AF_INET6, &sk->dst_ip6, dst_ip6, sizeof(dst_ip6));
printf("state:%u bound_dev_if:%u family:%u type:%u protocol:%u mark:%u priority:%u "
printf("%s: state:%u bound_dev_if:%u family:%u type:%u protocol:%u mark:%u priority:%u "
"src_ip4:%x(%s) src_ip6:%x:%x:%x:%x(%s) src_port:%u "
"dst_ip4:%x(%s) dst_ip6:%x:%x:%x:%x(%s) dst_port:%u\n",
prefix,
sk->state, sk->bound_dev_if, sk->family, sk->type, sk->protocol,
sk->mark, sk->priority,
sk->src_ip4, src_ip4,
@ -102,14 +74,15 @@ static void print_sk(const struct bpf_sock *sk)
dst_ip6, ntohs(sk->dst_port));
}
static void print_tp(const struct bpf_tcp_sock *tp)
static void print_tp(const struct bpf_tcp_sock *tp, const char *prefix)
{
printf("snd_cwnd:%u srtt_us:%u rtt_min:%u snd_ssthresh:%u rcv_nxt:%u "
printf("%s: snd_cwnd:%u srtt_us:%u rtt_min:%u snd_ssthresh:%u rcv_nxt:%u "
"snd_nxt:%u snd:una:%u mss_cache:%u ecn_flags:%u "
"rate_delivered:%u rate_interval_us:%u packets_out:%u "
"retrans_out:%u total_retrans:%u segs_in:%u data_segs_in:%u "
"segs_out:%u data_segs_out:%u lost_out:%u sacked_out:%u "
"bytes_received:%llu bytes_acked:%llu\n",
prefix,
tp->snd_cwnd, tp->srtt_us, tp->rtt_min, tp->snd_ssthresh,
tp->rcv_nxt, tp->snd_nxt, tp->snd_una, tp->mss_cache,
tp->ecn_flags, tp->rate_delivered, tp->rate_interval_us,
@ -129,57 +102,26 @@ static void check_result(void)
err = bpf_map_lookup_elem(linum_map_fd, &egress_linum_idx,
&egress_linum);
CHECK(err == -1, "bpf_map_lookup_elem(linum_map_fd)",
"err:%d errno:%d", err, errno);
"err:%d errno:%d\n", err, errno);
err = bpf_map_lookup_elem(linum_map_fd, &ingress_linum_idx,
&ingress_linum);
CHECK(err == -1, "bpf_map_lookup_elem(linum_map_fd)",
"err:%d errno:%d", err, errno);
"err:%d errno:%d\n", err, errno);
err = bpf_map_lookup_elem(sk_map_fd, &egress_srv_idx, &srv_sk);
CHECK(err == -1, "bpf_map_lookup_elem(sk_map_fd, &egress_srv_idx)",
"err:%d errno:%d", err, errno);
err = bpf_map_lookup_elem(tp_map_fd, &egress_srv_idx, &srv_tp);
CHECK(err == -1, "bpf_map_lookup_elem(tp_map_fd, &egress_srv_idx)",
"err:%d errno:%d", err, errno);
memcpy(&srv_sk, &skel->bss->srv_sk, sizeof(srv_sk));
memcpy(&srv_tp, &skel->bss->srv_tp, sizeof(srv_tp));
memcpy(&cli_sk, &skel->bss->cli_sk, sizeof(cli_sk));
memcpy(&cli_tp, &skel->bss->cli_tp, sizeof(cli_tp));
memcpy(&listen_sk, &skel->bss->listen_sk, sizeof(listen_sk));
memcpy(&listen_tp, &skel->bss->listen_tp, sizeof(listen_tp));
err = bpf_map_lookup_elem(sk_map_fd, &egress_cli_idx, &cli_sk);
CHECK(err == -1, "bpf_map_lookup_elem(sk_map_fd, &egress_cli_idx)",
"err:%d errno:%d", err, errno);
err = bpf_map_lookup_elem(tp_map_fd, &egress_cli_idx, &cli_tp);
CHECK(err == -1, "bpf_map_lookup_elem(tp_map_fd, &egress_cli_idx)",
"err:%d errno:%d", err, errno);
err = bpf_map_lookup_elem(sk_map_fd, &ingress_listen_idx, &listen_sk);
CHECK(err == -1, "bpf_map_lookup_elem(sk_map_fd, &ingress_listen_idx)",
"err:%d errno:%d", err, errno);
err = bpf_map_lookup_elem(tp_map_fd, &ingress_listen_idx, &listen_tp);
CHECK(err == -1, "bpf_map_lookup_elem(tp_map_fd, &ingress_listen_idx)",
"err:%d errno:%d", err, errno);
printf("listen_sk: ");
print_sk(&listen_sk);
printf("\n");
printf("srv_sk: ");
print_sk(&srv_sk);
printf("\n");
printf("cli_sk: ");
print_sk(&cli_sk);
printf("\n");
printf("listen_tp: ");
print_tp(&listen_tp);
printf("\n");
printf("srv_tp: ");
print_tp(&srv_tp);
printf("\n");
printf("cli_tp: ");
print_tp(&cli_tp);
printf("\n");
print_sk(&listen_sk, "listen_sk");
print_sk(&srv_sk, "srv_sk");
print_sk(&cli_sk, "cli_sk");
print_tp(&listen_tp, "listen_tp");
print_tp(&srv_tp, "srv_tp");
print_tp(&cli_tp, "cli_tp");
CHECK(listen_sk.state != 10 ||
listen_sk.family != AF_INET6 ||
@ -190,8 +132,8 @@ static void check_result(void)
listen_sk.dst_ip6[2] || listen_sk.dst_ip6[3] ||
listen_sk.src_port != ntohs(srv_sa6.sin6_port) ||
listen_sk.dst_port,
"Unexpected listen_sk",
"Check listen_sk output. ingress_linum:%u",
"listen_sk",
"Unexpected. Check listen_sk output. ingress_linum:%u\n",
ingress_linum);
CHECK(srv_sk.state == 10 ||
@ -204,7 +146,7 @@ static void check_result(void)
sizeof(srv_sk.dst_ip6)) ||
srv_sk.src_port != ntohs(srv_sa6.sin6_port) ||
srv_sk.dst_port != cli_sa6.sin6_port,
"Unexpected srv_sk", "Check srv_sk output. egress_linum:%u",
"srv_sk", "Unexpected. Check srv_sk output. egress_linum:%u\n",
egress_linum);
CHECK(cli_sk.state == 10 ||
@ -217,30 +159,31 @@ static void check_result(void)
sizeof(cli_sk.dst_ip6)) ||
cli_sk.src_port != ntohs(cli_sa6.sin6_port) ||
cli_sk.dst_port != srv_sa6.sin6_port,
"Unexpected cli_sk", "Check cli_sk output. egress_linum:%u",
"cli_sk", "Unexpected. Check cli_sk output. egress_linum:%u\n",
egress_linum);
CHECK(listen_tp.data_segs_out ||
listen_tp.data_segs_in ||
listen_tp.total_retrans ||
listen_tp.bytes_acked,
"Unexpected listen_tp", "Check listen_tp output. ingress_linum:%u",
"listen_tp",
"Unexpected. Check listen_tp output. ingress_linum:%u\n",
ingress_linum);
CHECK(srv_tp.data_segs_out != 2 ||
srv_tp.data_segs_in ||
srv_tp.snd_cwnd != 10 ||
srv_tp.total_retrans ||
srv_tp.bytes_acked != 2 * DATA_LEN,
"Unexpected srv_tp", "Check srv_tp output. egress_linum:%u",
srv_tp.bytes_acked < 2 * DATA_LEN,
"srv_tp", "Unexpected. Check srv_tp output. egress_linum:%u\n",
egress_linum);
CHECK(cli_tp.data_segs_out ||
cli_tp.data_segs_in != 2 ||
cli_tp.snd_cwnd != 10 ||
cli_tp.total_retrans ||
cli_tp.bytes_received != 2 * DATA_LEN,
"Unexpected cli_tp", "Check cli_tp output. egress_linum:%u",
cli_tp.bytes_received < 2 * DATA_LEN,
"cli_tp", "Unexpected. Check cli_tp output. egress_linum:%u\n",
egress_linum);
}
@ -257,15 +200,14 @@ static void check_sk_pkt_out_cnt(int accept_fd, int cli_fd)
&pkt_out_cnt10);
/* The bpf prog only counts for fullsock and
* passive conneciton did not become fullsock until 3WHS
* had been finished.
* The bpf prog only counted two data packet out but we
* specially init accept_fd's pkt_out_cnt by 2 in
* init_sk_storage(). Hence, 4 here.
* passive connection did not become fullsock until 3WHS
* had been finished, so the bpf prog only counted two data
* packet out.
*/
CHECK(err || pkt_out_cnt.cnt != 4 || pkt_out_cnt10.cnt != 40,
CHECK(err || pkt_out_cnt.cnt < 0xeB9F + 2 ||
pkt_out_cnt10.cnt < 0xeB9F + 20,
"bpf_map_lookup_elem(sk_pkt_out_cnt, &accept_fd)",
"err:%d errno:%d pkt_out_cnt:%u pkt_out_cnt10:%u",
"err:%d errno:%d pkt_out_cnt:%u pkt_out_cnt10:%u\n",
err, errno, pkt_out_cnt.cnt, pkt_out_cnt10.cnt);
pkt_out_cnt.cnt = ~0;
@ -280,14 +222,14 @@ static void check_sk_pkt_out_cnt(int accept_fd, int cli_fd)
*
* The bpf_prog initialized it to 0xeB9F.
*/
CHECK(err || pkt_out_cnt.cnt != 0xeB9F + 4 ||
pkt_out_cnt10.cnt != 0xeB9F + 40,
CHECK(err || pkt_out_cnt.cnt < 0xeB9F + 4 ||
pkt_out_cnt10.cnt < 0xeB9F + 40,
"bpf_map_lookup_elem(sk_pkt_out_cnt, &cli_fd)",
"err:%d errno:%d pkt_out_cnt:%u pkt_out_cnt10:%u",
"err:%d errno:%d pkt_out_cnt:%u pkt_out_cnt10:%u\n",
err, errno, pkt_out_cnt.cnt, pkt_out_cnt10.cnt);
}
static void init_sk_storage(int sk_fd, __u32 pkt_out_cnt)
static int init_sk_storage(int sk_fd, __u32 pkt_out_cnt)
{
struct bpf_spinlock_cnt scnt = {};
int err;
@ -295,186 +237,190 @@ static void init_sk_storage(int sk_fd, __u32 pkt_out_cnt)
scnt.cnt = pkt_out_cnt;
err = bpf_map_update_elem(sk_pkt_out_cnt_fd, &sk_fd, &scnt,
BPF_NOEXIST);
CHECK(err, "bpf_map_update_elem(sk_pkt_out_cnt_fd)",
"err:%d errno:%d", err, errno);
if (CHECK(err, "bpf_map_update_elem(sk_pkt_out_cnt_fd)",
"err:%d errno:%d\n", err, errno))
return err;
scnt.cnt *= 10;
err = bpf_map_update_elem(sk_pkt_out_cnt10_fd, &sk_fd, &scnt,
BPF_NOEXIST);
CHECK(err, "bpf_map_update_elem(sk_pkt_out_cnt10_fd)",
"err:%d errno:%d", err, errno);
if (CHECK(err, "bpf_map_update_elem(sk_pkt_out_cnt10_fd)",
"err:%d errno:%d\n", err, errno))
return err;
return 0;
}
static void test(void)
{
int listen_fd, cli_fd, accept_fd, epfd, err;
int listen_fd = -1, cli_fd = -1, accept_fd = -1, epfd, err, i;
struct epoll_event ev;
socklen_t addrlen;
int i;
char buf[DATA_LEN];
addrlen = sizeof(struct sockaddr_in6);
ev.events = EPOLLIN;
epfd = epoll_create(1);
CHECK(epfd == -1, "epoll_create()", "epfd:%d errno:%d", epfd, errno);
if (CHECK(epfd == -1, "epoll_create()", "epfd:%d errno:%d\n",
epfd, errno))
return;
/* Prepare listen_fd */
listen_fd = socket(AF_INET6, SOCK_STREAM | SOCK_NONBLOCK, 0);
CHECK(listen_fd == -1, "socket()", "listen_fd:%d errno:%d",
listen_fd, errno);
if (CHECK(listen_fd == -1, "socket()", "listen_fd:%d errno:%d\n",
listen_fd, errno))
goto done;
init_loopback6(&srv_sa6);
err = bind(listen_fd, (struct sockaddr *)&srv_sa6, sizeof(srv_sa6));
CHECK(err, "bind(listen_fd)", "err:%d errno:%d", err, errno);
if (CHECK(err, "bind(listen_fd)", "err:%d errno:%d\n", err, errno))
goto done;
err = getsockname(listen_fd, (struct sockaddr *)&srv_sa6, &addrlen);
CHECK(err, "getsockname(listen_fd)", "err:%d errno:%d", err, errno);
if (CHECK(err, "getsockname(listen_fd)", "err:%d errno:%d\n", err,
errno))
goto done;
memcpy(&skel->bss->srv_sa6, &srv_sa6, sizeof(srv_sa6));
err = listen(listen_fd, 1);
CHECK(err, "listen(listen_fd)", "err:%d errno:%d", err, errno);
if (CHECK(err, "listen(listen_fd)", "err:%d errno:%d\n", err, errno))
goto done;
/* Prepare cli_fd */
cli_fd = socket(AF_INET6, SOCK_STREAM | SOCK_NONBLOCK, 0);
CHECK(cli_fd == -1, "socket()", "cli_fd:%d errno:%d", cli_fd, errno);
if (CHECK(cli_fd == -1, "socket()", "cli_fd:%d errno:%d\n", cli_fd,
errno))
goto done;
init_loopback6(&cli_sa6);
err = bind(cli_fd, (struct sockaddr *)&cli_sa6, sizeof(cli_sa6));
CHECK(err, "bind(cli_fd)", "err:%d errno:%d", err, errno);
if (CHECK(err, "bind(cli_fd)", "err:%d errno:%d\n", err, errno))
goto done;
err = getsockname(cli_fd, (struct sockaddr *)&cli_sa6, &addrlen);
CHECK(err, "getsockname(cli_fd)", "err:%d errno:%d",
err, errno);
/* Update addr_map with srv_sa6 and cli_sa6 */
err = bpf_map_update_elem(addr_map_fd, &addr_srv_idx, &srv_sa6, 0);
CHECK(err, "map_update", "err:%d errno:%d", err, errno);
err = bpf_map_update_elem(addr_map_fd, &addr_cli_idx, &cli_sa6, 0);
CHECK(err, "map_update", "err:%d errno:%d", err, errno);
if (CHECK(err, "getsockname(cli_fd)", "err:%d errno:%d\n",
err, errno))
goto done;
/* Connect from cli_sa6 to srv_sa6 */
err = connect(cli_fd, (struct sockaddr *)&srv_sa6, addrlen);
printf("srv_sa6.sin6_port:%u cli_sa6.sin6_port:%u\n\n",
ntohs(srv_sa6.sin6_port), ntohs(cli_sa6.sin6_port));
CHECK(err && errno != EINPROGRESS,
"connect(cli_fd)", "err:%d errno:%d", err, errno);
if (CHECK(err && errno != EINPROGRESS,
"connect(cli_fd)", "err:%d errno:%d\n", err, errno))
goto done;
ev.data.fd = listen_fd;
err = epoll_ctl(epfd, EPOLL_CTL_ADD, listen_fd, &ev);
CHECK(err, "epoll_ctl(EPOLL_CTL_ADD, listen_fd)", "err:%d errno:%d",
err, errno);
if (CHECK(err, "epoll_ctl(EPOLL_CTL_ADD, listen_fd)",
"err:%d errno:%d\n", err, errno))
goto done;
/* Accept the connection */
/* Have some timeout in accept(listen_fd). Just in case. */
err = epoll_wait(epfd, &ev, 1, 1000);
CHECK(err != 1 || ev.data.fd != listen_fd,
if (CHECK(err != 1 || ev.data.fd != listen_fd,
"epoll_wait(listen_fd)",
"err:%d errno:%d ev.data.fd:%d listen_fd:%d",
err, errno, ev.data.fd, listen_fd);
"err:%d errno:%d ev.data.fd:%d listen_fd:%d\n",
err, errno, ev.data.fd, listen_fd))
goto done;
accept_fd = accept(listen_fd, NULL, NULL);
CHECK(accept_fd == -1, "accept(listen_fd)", "accept_fd:%d errno:%d",
accept_fd, errno);
close(listen_fd);
if (CHECK(accept_fd == -1, "accept(listen_fd)",
"accept_fd:%d errno:%d\n",
accept_fd, errno))
goto done;
ev.data.fd = cli_fd;
err = epoll_ctl(epfd, EPOLL_CTL_ADD, cli_fd, &ev);
CHECK(err, "epoll_ctl(EPOLL_CTL_ADD, cli_fd)", "err:%d errno:%d",
err, errno);
if (CHECK(err, "epoll_ctl(EPOLL_CTL_ADD, cli_fd)",
"err:%d errno:%d\n", err, errno))
goto done;
init_sk_storage(accept_fd, 2);
if (init_sk_storage(accept_fd, 0xeB9F))
goto done;
for (i = 0; i < 2; i++) {
/* Send some data from accept_fd to cli_fd */
err = send(accept_fd, DATA, DATA_LEN, 0);
CHECK(err != DATA_LEN, "send(accept_fd)", "err:%d errno:%d",
err, errno);
/* Send some data from accept_fd to cli_fd.
* MSG_EOR to stop kernel from coalescing two pkts.
*/
err = send(accept_fd, DATA, DATA_LEN, MSG_EOR);
if (CHECK(err != DATA_LEN, "send(accept_fd)",
"err:%d errno:%d\n", err, errno))
goto done;
/* Have some timeout in recv(cli_fd). Just in case. */
err = epoll_wait(epfd, &ev, 1, 1000);
CHECK(err != 1 || ev.data.fd != cli_fd,
"epoll_wait(cli_fd)", "err:%d errno:%d ev.data.fd:%d cli_fd:%d",
err, errno, ev.data.fd, cli_fd);
if (CHECK(err != 1 || ev.data.fd != cli_fd,
"epoll_wait(cli_fd)",
"err:%d errno:%d ev.data.fd:%d cli_fd:%d\n",
err, errno, ev.data.fd, cli_fd))
goto done;
err = recv(cli_fd, NULL, 0, MSG_TRUNC);
CHECK(err, "recv(cli_fd)", "err:%d errno:%d", err, errno);
err = recv(cli_fd, buf, DATA_LEN, 0);
if (CHECK(err != DATA_LEN, "recv(cli_fd)", "err:%d errno:%d\n",
err, errno))
goto done;
}
shutdown(cli_fd, SHUT_WR);
err = recv(accept_fd, buf, 1, 0);
if (CHECK(err, "recv(accept_fd) for fin", "err:%d errno:%d\n",
err, errno))
goto done;
shutdown(accept_fd, SHUT_WR);
err = recv(cli_fd, buf, 1, 0);
if (CHECK(err, "recv(cli_fd) for fin", "err:%d errno:%d\n",
err, errno))
goto done;
check_sk_pkt_out_cnt(accept_fd, cli_fd);
close(epfd);
close(accept_fd);
close(cli_fd);
check_result();
done:
if (accept_fd != -1)
close(accept_fd);
if (cli_fd != -1)
close(cli_fd);
if (listen_fd != -1)
close(listen_fd);
close(epfd);
}
void test_sock_fields(void)
{
struct bpf_prog_load_attr attr = {
.file = "test_sock_fields.o",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.prog_flags = BPF_F_TEST_RND_HI32,
};
int cgroup_fd, egress_fd, ingress_fd, err;
struct bpf_program *ingress_prog;
struct bpf_object *obj;
struct bpf_map *map;
struct bpf_link *egress_link = NULL, *ingress_link = NULL;
int cgroup_fd;
/* Create a cgroup, get fd, and join it */
cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
CHECK(cgroup_fd < 0, "cgroup_setup_and_join()",
"cgroup_fd:%d errno:%d", cgroup_fd, errno);
atexit(cleanup_cgroup_environment);
cgroup_fd = test__join_cgroup(TEST_CGROUP);
if (CHECK_FAIL(cgroup_fd < 0))
return;
err = bpf_prog_load_xattr(&attr, &obj, &egress_fd);
CHECK(err, "bpf_prog_load_xattr()", "err:%d", err);
skel = test_sock_fields__open_and_load();
if (CHECK(!skel, "test_sock_fields__open_and_load", "failed\n"))
goto done;
ingress_prog = bpf_object__find_program_by_title(obj,
"cgroup_skb/ingress");
CHECK(!ingress_prog,
"bpf_object__find_program_by_title(cgroup_skb/ingress)",
"not found");
ingress_fd = bpf_program__fd(ingress_prog);
egress_link = bpf_program__attach_cgroup(skel->progs.egress_read_sock_fields,
cgroup_fd);
if (CHECK(IS_ERR(egress_link), "attach_cgroup(egress)", "err:%ld\n",
PTR_ERR(egress_link)))
goto done;
err = bpf_prog_attach(egress_fd, cgroup_fd, BPF_CGROUP_INET_EGRESS, 0);
CHECK(err == -1, "bpf_prog_attach(CPF_CGROUP_INET_EGRESS)",
"err:%d errno%d", err, errno);
ingress_link = bpf_program__attach_cgroup(skel->progs.ingress_read_sock_fields,
cgroup_fd);
if (CHECK(IS_ERR(ingress_link), "attach_cgroup(ingress)", "err:%ld\n",
PTR_ERR(ingress_link)))
goto done;
err = bpf_prog_attach(ingress_fd, cgroup_fd,
BPF_CGROUP_INET_INGRESS, 0);
CHECK(err == -1, "bpf_prog_attach(CPF_CGROUP_INET_INGRESS)",
"err:%d errno%d", err, errno);
close(cgroup_fd);
map = bpf_object__find_map_by_name(obj, "addr_map");
CHECK(!map, "cannot find addr_map", "(null)");
addr_map_fd = bpf_map__fd(map);
map = bpf_object__find_map_by_name(obj, "sock_result_map");
CHECK(!map, "cannot find sock_result_map", "(null)");
sk_map_fd = bpf_map__fd(map);
map = bpf_object__find_map_by_name(obj, "tcp_sock_result_map");
CHECK(!map, "cannot find tcp_sock_result_map", "(null)");
tp_map_fd = bpf_map__fd(map);
map = bpf_object__find_map_by_name(obj, "linum_map");
CHECK(!map, "cannot find linum_map", "(null)");
linum_map_fd = bpf_map__fd(map);
map = bpf_object__find_map_by_name(obj, "sk_pkt_out_cnt");
CHECK(!map, "cannot find sk_pkt_out_cnt", "(null)");
sk_pkt_out_cnt_fd = bpf_map__fd(map);
map = bpf_object__find_map_by_name(obj, "sk_pkt_out_cnt10");
CHECK(!map, "cannot find sk_pkt_out_cnt10", "(null)");
sk_pkt_out_cnt10_fd = bpf_map__fd(map);
linum_map_fd = bpf_map__fd(skel->maps.linum_map);
sk_pkt_out_cnt_fd = bpf_map__fd(skel->maps.sk_pkt_out_cnt);
sk_pkt_out_cnt10_fd = bpf_map__fd(skel->maps.sk_pkt_out_cnt10);
test();
bpf_object__close(obj);
cleanup_cgroup_environment();
printf("PASS\n");
done:
bpf_link__destroy(egress_link);
bpf_link__destroy(ingress_link);
test_sock_fields__destroy(skel);
close(cgroup_fd);
}

160
tools/testing/selftests/bpf/progs/test_sock_fields.c
View File

@ -8,46 +8,12 @@
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
enum bpf_addr_array_idx {
ADDR_SRV_IDX,
ADDR_CLI_IDX,
__NR_BPF_ADDR_ARRAY_IDX,
};
enum bpf_result_array_idx {
EGRESS_SRV_IDX,
EGRESS_CLI_IDX,
INGRESS_LISTEN_IDX,
__NR_BPF_RESULT_ARRAY_IDX,
};
enum bpf_linum_array_idx {
EGRESS_LINUM_IDX,
INGRESS_LINUM_IDX,
__NR_BPF_LINUM_ARRAY_IDX,
};
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, __NR_BPF_ADDR_ARRAY_IDX);
__type(key, __u32);
__type(value, struct sockaddr_in6);
} addr_map SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, __NR_BPF_RESULT_ARRAY_IDX);
__type(key, __u32);
__type(value, struct bpf_sock);
} sock_result_map SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, __NR_BPF_RESULT_ARRAY_IDX);
__type(key, __u32);
__type(value, struct bpf_tcp_sock);
} tcp_sock_result_map SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, __NR_BPF_LINUM_ARRAY_IDX);
@ -74,6 +40,14 @@ struct {
__type(value, struct bpf_spinlock_cnt);
} sk_pkt_out_cnt10 SEC(".maps");
struct bpf_tcp_sock listen_tp = {};
struct sockaddr_in6 srv_sa6 = {};
struct bpf_tcp_sock cli_tp = {};
struct bpf_tcp_sock srv_tp = {};
struct bpf_sock listen_sk = {};
struct bpf_sock srv_sk = {};
struct bpf_sock cli_sk = {};
static bool is_loopback6(__u32 *a6)
{
return !a6[0] && !a6[1] && !a6[2] && a6[3] == bpf_htonl(1);
@ -130,19 +104,20 @@ static void tpcpy(struct bpf_tcp_sock *dst,
dst->bytes_acked = src->bytes_acked;
}
#define RETURN { \
/* Always return CG_OK so that no pkt will be filtered out */
#define CG_OK 1
#define RET_LOG() ({ \
linum = __LINE__; \
bpf_map_update_elem(&linum_map, &linum_idx, &linum, 0); \
return 1; \
}
bpf_map_update_elem(&linum_map, &linum_idx, &linum, BPF_NOEXIST); \
return CG_OK; \
})
SEC("cgroup_skb/egress")
int egress_read_sock_fields(struct __sk_buff *skb)
{
struct bpf_spinlock_cnt cli_cnt_init = { .lock = 0, .cnt = 0xeB9F };
__u32 srv_idx = ADDR_SRV_IDX, cli_idx = ADDR_CLI_IDX, result_idx;
struct bpf_spinlock_cnt *pkt_out_cnt, *pkt_out_cnt10;
struct sockaddr_in6 *srv_sa6, *cli_sa6;
struct bpf_tcp_sock *tp, *tp_ret;
struct bpf_sock *sk, *sk_ret;
__u32 linum, linum_idx;
@ -150,39 +125,46 @@ int egress_read_sock_fields(struct __sk_buff *skb)
linum_idx = EGRESS_LINUM_IDX;
sk = skb->sk;
if (!sk || sk->state == 10)
RETURN;
if (!sk)
RET_LOG();
/* Not the testing egress traffic or
* TCP_LISTEN (10) socket will be copied at the ingress side.
*/
if (sk->family != AF_INET6 || !is_loopback6(sk->src_ip6) ||
sk->state == 10)
return CG_OK;
if (sk->src_port == bpf_ntohs(srv_sa6.sin6_port)) {
/* Server socket */
sk_ret = &srv_sk;
tp_ret = &srv_tp;
} else if (sk->dst_port == srv_sa6.sin6_port) {
/* Client socket */
sk_ret = &cli_sk;
tp_ret = &cli_tp;
} else {
/* Not the testing egress traffic */
return CG_OK;
}
/* It must be a fullsock for cgroup_skb/egress prog */
sk = bpf_sk_fullsock(sk);
if (!sk || sk->family != AF_INET6 || sk->protocol != IPPROTO_TCP ||
!is_loopback6(sk->src_ip6))
RETURN;
if (!sk)
RET_LOG();
/* Not the testing egress traffic */
if (sk->protocol != IPPROTO_TCP)
return CG_OK;
tp = bpf_tcp_sock(sk);
if (!tp)
RETURN;
srv_sa6 = bpf_map_lookup_elem(&addr_map, &srv_idx);
cli_sa6 = bpf_map_lookup_elem(&addr_map, &cli_idx);
if (!srv_sa6 || !cli_sa6)
RETURN;
if (sk->src_port == bpf_ntohs(srv_sa6->sin6_port))
result_idx = EGRESS_SRV_IDX;
else if (sk->src_port == bpf_ntohs(cli_sa6->sin6_port))
result_idx = EGRESS_CLI_IDX;
else
RETURN;
sk_ret = bpf_map_lookup_elem(&sock_result_map, &result_idx);
tp_ret = bpf_map_lookup_elem(&tcp_sock_result_map, &result_idx);
if (!sk_ret || !tp_ret)
RETURN;
RET_LOG();
skcpy(sk_ret, sk);
tpcpy(tp_ret, tp);
if (result_idx == EGRESS_SRV_IDX) {
if (sk_ret == &srv_sk) {
/* The userspace has created it for srv sk */
pkt_out_cnt = bpf_sk_storage_get(&sk_pkt_out_cnt, sk, 0, 0);
pkt_out_cnt10 = bpf_sk_storage_get(&sk_pkt_out_cnt10, sk,
@ -197,7 +179,7 @@ int egress_read_sock_fields(struct __sk_buff *skb)
}
if (!pkt_out_cnt || !pkt_out_cnt10)
RETURN;
RET_LOG();
/* Even both cnt and cnt10 have lock defined in their BTF,
* intentionally one cnt takes lock while one does not
@ -208,48 +190,44 @@ int egress_read_sock_fields(struct __sk_buff *skb)
pkt_out_cnt10->cnt += 10;
bpf_spin_unlock(&pkt_out_cnt10->lock);
RETURN;
return CG_OK;
}
SEC("cgroup_skb/ingress")
int ingress_read_sock_fields(struct __sk_buff *skb)
{
__u32 srv_idx = ADDR_SRV_IDX, result_idx = INGRESS_LISTEN_IDX;
struct bpf_tcp_sock *tp, *tp_ret;
struct bpf_sock *sk, *sk_ret;
struct sockaddr_in6 *srv_sa6;
struct bpf_tcp_sock *tp;
__u32 linum, linum_idx;
struct bpf_sock *sk;
linum_idx = INGRESS_LINUM_IDX;
sk = skb->sk;
if (!sk || sk->family != AF_INET6 || !is_loopback6(sk->src_ip6))
RETURN;
srv_sa6 = bpf_map_lookup_elem(&addr_map, &srv_idx);
if (!srv_sa6 || sk->src_port != bpf_ntohs(srv_sa6->sin6_port))
RETURN;
if (sk->state != 10 && sk->state != 12)
RETURN;
sk = bpf_get_listener_sock(sk);
if (!sk)
RETURN;
RET_LOG();
/* Not the testing ingress traffic to the server */
if (sk->family != AF_INET6 || !is_loopback6(sk->src_ip6) ||
sk->src_port != bpf_ntohs(srv_sa6.sin6_port))
return CG_OK;
/* Only interested in TCP_LISTEN */
if (sk->state != 10)
return CG_OK;
/* It must be a fullsock for cgroup_skb/ingress prog */
sk = bpf_sk_fullsock(sk);
if (!sk)
RET_LOG();
tp = bpf_tcp_sock(sk);
if (!tp)
RETURN;
RET_LOG();
sk_ret = bpf_map_lookup_elem(&sock_result_map, &result_idx);
tp_ret = bpf_map_lookup_elem(&tcp_sock_result_map, &result_idx);
if (!sk_ret || !tp_ret)
RETURN;
skcpy(&listen_sk, sk);
tpcpy(&listen_tp, tp);
skcpy(sk_ret, sk);
tpcpy(tp_ret, tp);
RETURN;
return CG_OK;
}
char _license[] SEC("license") = "GPL";