selftests/bpf: test BPF_SOCK_OPS_RTT_CB
Make sure the callback is invoked for syn-ack and data packet. Cc: Eric Dumazet <edumazet@google.com> Cc: Priyaranjan Jha <priyarjha@google.com> Cc: Yuchung Cheng <ycheng@google.com> Cc: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Stanislav Fomichev <sdf@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>alistair/sunxi64-5.4-dsi
Stanislav Fomichev
Daniel Borkmann
parent
692cbaa99f
commit
b55873984d
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@ -27,7 +27,7 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
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test_cgroup_storage test_select_reuseport test_section_names \
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test_netcnt test_tcpnotify_user test_sock_fields test_sysctl test_hashmap \
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test_btf_dump test_cgroup_attach xdping test_sockopt test_sockopt_sk \
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test_sockopt_multi
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test_sockopt_multi test_tcp_rtt
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BPF_OBJ_FILES = $(patsubst %.c,%.o, $(notdir $(wildcard progs/*.c)))
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TEST_GEN_FILES = $(BPF_OBJ_FILES)
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@ -107,6 +107,7 @@ $(OUTPUT)/test_cgroup_attach: cgroup_helpers.c
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$(OUTPUT)/test_sockopt: cgroup_helpers.c
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$(OUTPUT)/test_sockopt_sk: cgroup_helpers.c
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$(OUTPUT)/test_sockopt_multi: cgroup_helpers.c
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$(OUTPUT)/test_tcp_rtt: cgroup_helpers.c
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.PHONY: force
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@ -0,0 +1,61 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include "bpf_helpers.h"
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char _license[] SEC("license") = "GPL";
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__u32 _version SEC("version") = 1;
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struct tcp_rtt_storage {
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__u32 invoked;
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__u32 dsack_dups;
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__u32 delivered;
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__u32 delivered_ce;
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__u32 icsk_retransmits;
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};
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struct bpf_map_def SEC("maps") socket_storage_map = {
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.type = BPF_MAP_TYPE_SK_STORAGE,
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.key_size = sizeof(int),
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.value_size = sizeof(struct tcp_rtt_storage),
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.map_flags = BPF_F_NO_PREALLOC,
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};
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BPF_ANNOTATE_KV_PAIR(socket_storage_map, int, struct tcp_rtt_storage);
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SEC("sockops")
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int _sockops(struct bpf_sock_ops *ctx)
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{
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struct tcp_rtt_storage *storage;
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struct bpf_tcp_sock *tcp_sk;
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int op = (int) ctx->op;
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struct bpf_sock *sk;
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sk = ctx->sk;
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if (!sk)
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return 1;
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storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
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BPF_SK_STORAGE_GET_F_CREATE);
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if (!storage)
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return 1;
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if (op == BPF_SOCK_OPS_TCP_CONNECT_CB) {
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bpf_sock_ops_cb_flags_set(ctx, BPF_SOCK_OPS_RTT_CB_FLAG);
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return 1;
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}
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if (op != BPF_SOCK_OPS_RTT_CB)
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return 1;
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tcp_sk = bpf_tcp_sock(sk);
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if (!tcp_sk)
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return 1;
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storage->invoked++;
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storage->dsack_dups = tcp_sk->dsack_dups;
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storage->delivered = tcp_sk->delivered;
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storage->delivered_ce = tcp_sk->delivered_ce;
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storage->icsk_retransmits = tcp_sk->icsk_retransmits;
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return 1;
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}
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@ -0,0 +1,254 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <error.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <pthread.h>
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#include <linux/filter.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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#include "bpf_rlimit.h"
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#include "bpf_util.h"
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#include "cgroup_helpers.h"
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#define CG_PATH "/tcp_rtt"
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struct tcp_rtt_storage {
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__u32 invoked;
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__u32 dsack_dups;
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__u32 delivered;
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__u32 delivered_ce;
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__u32 icsk_retransmits;
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};
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static void send_byte(int fd)
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{
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char b = 0x55;
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if (write(fd, &b, sizeof(b)) != 1)
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error(1, errno, "Failed to send single byte");
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}
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static int verify_sk(int map_fd, int client_fd, const char *msg, __u32 invoked,
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__u32 dsack_dups, __u32 delivered, __u32 delivered_ce,
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__u32 icsk_retransmits)
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{
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int err = 0;
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struct tcp_rtt_storage val;
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if (bpf_map_lookup_elem(map_fd, &client_fd, &val) < 0)
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error(1, errno, "Failed to read socket storage");
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if (val.invoked != invoked) {
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log_err("%s: unexpected bpf_tcp_sock.invoked %d != %d",
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msg, val.invoked, invoked);
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err++;
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}
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if (val.dsack_dups != dsack_dups) {
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log_err("%s: unexpected bpf_tcp_sock.dsack_dups %d != %d",
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msg, val.dsack_dups, dsack_dups);
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err++;
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}
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if (val.delivered != delivered) {
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log_err("%s: unexpected bpf_tcp_sock.delivered %d != %d",
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msg, val.delivered, delivered);
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err++;
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}
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if (val.delivered_ce != delivered_ce) {
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log_err("%s: unexpected bpf_tcp_sock.delivered_ce %d != %d",
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msg, val.delivered_ce, delivered_ce);
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err++;
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}
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if (val.icsk_retransmits != icsk_retransmits) {
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log_err("%s: unexpected bpf_tcp_sock.icsk_retransmits %d != %d",
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msg, val.icsk_retransmits, icsk_retransmits);
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err++;
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}
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return err;
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}
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static int connect_to_server(int server_fd)
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{
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struct sockaddr_storage addr;
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socklen_t len = sizeof(addr);
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int fd;
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fd = socket(AF_INET, SOCK_STREAM, 0);
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if (fd < 0) {
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log_err("Failed to create client socket");
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return -1;
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}
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if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) {
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log_err("Failed to get server addr");
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goto out;
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}
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if (connect(fd, (const struct sockaddr *)&addr, len) < 0) {
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log_err("Fail to connect to server");
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goto out;
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}
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return fd;
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out:
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close(fd);
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return -1;
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}
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static int run_test(int cgroup_fd, int server_fd)
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{
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struct bpf_prog_load_attr attr = {
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.prog_type = BPF_PROG_TYPE_SOCK_OPS,
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.file = "./tcp_rtt.o",
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.expected_attach_type = BPF_CGROUP_SOCK_OPS,
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};
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struct bpf_object *obj;
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struct bpf_map *map;
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int client_fd;
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int prog_fd;
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int map_fd;
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int err;
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err = bpf_prog_load_xattr(&attr, &obj, &prog_fd);
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if (err) {
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log_err("Failed to load BPF object");
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return -1;
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}
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map = bpf_map__next(NULL, obj);
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map_fd = bpf_map__fd(map);
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err = bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_SOCK_OPS, 0);
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if (err) {
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log_err("Failed to attach BPF program");
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goto close_bpf_object;
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}
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client_fd = connect_to_server(server_fd);
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if (client_fd < 0) {
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err = -1;
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goto close_bpf_object;
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}
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err += verify_sk(map_fd, client_fd, "syn-ack",
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/*invoked=*/1,
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/*dsack_dups=*/0,
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/*delivered=*/1,
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/*delivered_ce=*/0,
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/*icsk_retransmits=*/0);
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send_byte(client_fd);
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err += verify_sk(map_fd, client_fd, "first payload byte",
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/*invoked=*/2,
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/*dsack_dups=*/0,
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/*delivered=*/2,
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/*delivered_ce=*/0,
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/*icsk_retransmits=*/0);
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close(client_fd);
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close_bpf_object:
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bpf_object__close(obj);
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return err;
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}
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static int start_server(void)
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{
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struct sockaddr_in addr = {
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.sin_family = AF_INET,
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.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
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};
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int fd;
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fd = socket(AF_INET, SOCK_STREAM, 0);
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if (fd < 0) {
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log_err("Failed to create server socket");
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return -1;
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}
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if (bind(fd, (const struct sockaddr *)&addr, sizeof(addr)) < 0) {
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log_err("Failed to bind socket");
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close(fd);
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return -1;
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}
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return fd;
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}
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static void *server_thread(void *arg)
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{
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struct sockaddr_storage addr;
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socklen_t len = sizeof(addr);
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int fd = *(int *)arg;
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int client_fd;
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if (listen(fd, 1) < 0)
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error(1, errno, "Failed to listed on socket");
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client_fd = accept(fd, (struct sockaddr *)&addr, &len);
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if (client_fd < 0)
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error(1, errno, "Failed to accept client");
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/* Wait for the next connection (that never arrives)
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* to keep this thread alive to prevent calling
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* close() on client_fd.
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*/
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if (accept(fd, (struct sockaddr *)&addr, &len) >= 0)
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error(1, errno, "Unexpected success in second accept");
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close(client_fd);
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return NULL;
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}
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int main(int args, char **argv)
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{
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int server_fd, cgroup_fd;
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int err = EXIT_SUCCESS;
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pthread_t tid;
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if (setup_cgroup_environment())
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goto cleanup_obj;
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cgroup_fd = create_and_get_cgroup(CG_PATH);
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if (cgroup_fd < 0)
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goto cleanup_cgroup_env;
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if (join_cgroup(CG_PATH))
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goto cleanup_cgroup;
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server_fd = start_server();
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if (server_fd < 0) {
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err = EXIT_FAILURE;
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goto cleanup_cgroup;
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}
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pthread_create(&tid, NULL, server_thread, (void *)&server_fd);
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if (run_test(cgroup_fd, server_fd))
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err = EXIT_FAILURE;
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close(server_fd);
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printf("test_sockopt_sk: %s\n",
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err == EXIT_SUCCESS ? "PASSED" : "FAILED");
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cleanup_cgroup:
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close(cgroup_fd);
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cleanup_cgroup_env:
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cleanup_cgroup_environment();
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cleanup_obj:
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return err;
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}
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