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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/bpf/prog_tests/sock_fields.c | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/sock_fields.c')
-rw-r--r-- | tools/testing/selftests/bpf/prog_tests/sock_fields.c | 404 |
1 files changed, 404 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/sock_fields.c b/tools/testing/selftests/bpf/prog_tests/sock_fields.c new file mode 100644 index 000000000..e8b5bf707 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/sock_fields.c @@ -0,0 +1,404 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2019 Facebook */ + +#define _GNU_SOURCE +#include <netinet/in.h> +#include <arpa/inet.h> +#include <unistd.h> +#include <sched.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> + +#include <bpf/bpf.h> +#include <bpf/libbpf.h> +#include <linux/compiler.h> + +#include "network_helpers.h" +#include "cgroup_helpers.h" +#include "test_progs.h" +#include "bpf_rlimit.h" +#include "test_sock_fields.skel.h" + +enum bpf_linum_array_idx { + EGRESS_LINUM_IDX, + INGRESS_LINUM_IDX, + READ_SK_DST_PORT_LINUM_IDX, + __NR_BPF_LINUM_ARRAY_IDX, +}; + +struct bpf_spinlock_cnt { + struct bpf_spin_lock lock; + __u32 cnt; +}; + +#define PARENT_CGROUP "/test-bpf-sock-fields" +#define CHILD_CGROUP "/test-bpf-sock-fields/child" +#define DATA "Hello BPF!" +#define DATA_LEN sizeof(DATA) + +static struct sockaddr_in6 srv_sa6, cli_sa6; +static int sk_pkt_out_cnt10_fd; +static struct test_sock_fields *skel; +static int sk_pkt_out_cnt_fd; +static __u64 parent_cg_id; +static __u64 child_cg_id; +static int linum_map_fd; +static __u32 duration; + +static bool create_netns(void) +{ + if (!ASSERT_OK(unshare(CLONE_NEWNET), "create netns")) + return false; + + if (!ASSERT_OK(system("ip link set dev lo up"), "bring up lo")) + return false; + + return true; +} + +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]; + + inet_ntop(AF_INET, &sk->src_ip4, src_ip4, sizeof(src_ip4)); + inet_ntop(AF_INET6, &sk->src_ip6, src_ip6, sizeof(src_ip6)); + 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("%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, + sk->src_ip6[0], sk->src_ip6[1], sk->src_ip6[2], sk->src_ip6[3], + src_ip6, sk->src_port, + sk->dst_ip4, dst_ip4, + sk->dst_ip6[0], sk->dst_ip6[1], sk->dst_ip6[2], sk->dst_ip6[3], + dst_ip6, ntohs(sk->dst_port)); +} + +static void print_tp(const struct bpf_tcp_sock *tp, const char *prefix) +{ + 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, + tp->packets_out, tp->retrans_out, tp->total_retrans, + tp->segs_in, tp->data_segs_in, tp->segs_out, + tp->data_segs_out, tp->lost_out, tp->sacked_out, + tp->bytes_received, tp->bytes_acked); +} + +static void check_result(void) +{ + struct bpf_tcp_sock srv_tp, cli_tp, listen_tp; + struct bpf_sock srv_sk, cli_sk, listen_sk; + __u32 idx, ingress_linum, egress_linum, linum; + int err; + + idx = EGRESS_LINUM_IDX; + err = bpf_map_lookup_elem(linum_map_fd, &idx, &egress_linum); + CHECK(err == -1, "bpf_map_lookup_elem(linum_map_fd)", + "err:%d errno:%d\n", err, errno); + + idx = INGRESS_LINUM_IDX; + err = bpf_map_lookup_elem(linum_map_fd, &idx, &ingress_linum); + CHECK(err == -1, "bpf_map_lookup_elem(linum_map_fd)", + "err:%d errno:%d\n", err, errno); + + idx = READ_SK_DST_PORT_LINUM_IDX; + err = bpf_map_lookup_elem(linum_map_fd, &idx, &linum); + ASSERT_OK(err, "bpf_map_lookup_elem(linum_map_fd, READ_SK_DST_PORT_IDX)"); + ASSERT_EQ(linum, 0, "failure in read_sk_dst_port on line"); + + 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)); + + 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 || + listen_sk.protocol != IPPROTO_TCP || + memcmp(listen_sk.src_ip6, &in6addr_loopback, + sizeof(listen_sk.src_ip6)) || + listen_sk.dst_ip6[0] || listen_sk.dst_ip6[1] || + listen_sk.dst_ip6[2] || listen_sk.dst_ip6[3] || + listen_sk.src_port != ntohs(srv_sa6.sin6_port) || + listen_sk.dst_port, + "listen_sk", + "Unexpected. Check listen_sk output. ingress_linum:%u\n", + ingress_linum); + + CHECK(srv_sk.state == 10 || + !srv_sk.state || + srv_sk.family != AF_INET6 || + srv_sk.protocol != IPPROTO_TCP || + memcmp(srv_sk.src_ip6, &in6addr_loopback, + sizeof(srv_sk.src_ip6)) || + memcmp(srv_sk.dst_ip6, &in6addr_loopback, + sizeof(srv_sk.dst_ip6)) || + srv_sk.src_port != ntohs(srv_sa6.sin6_port) || + srv_sk.dst_port != cli_sa6.sin6_port, + "srv_sk", "Unexpected. Check srv_sk output. egress_linum:%u\n", + egress_linum); + + CHECK(!skel->bss->lsndtime, "srv_tp", "Unexpected lsndtime:0\n"); + + CHECK(cli_sk.state == 10 || + !cli_sk.state || + cli_sk.family != AF_INET6 || + cli_sk.protocol != IPPROTO_TCP || + memcmp(cli_sk.src_ip6, &in6addr_loopback, + sizeof(cli_sk.src_ip6)) || + memcmp(cli_sk.dst_ip6, &in6addr_loopback, + sizeof(cli_sk.dst_ip6)) || + cli_sk.src_port != ntohs(cli_sa6.sin6_port) || + cli_sk.dst_port != srv_sa6.sin6_port, + "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, + "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, + "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, + "cli_tp", "Unexpected. Check cli_tp output. egress_linum:%u\n", + egress_linum); + + CHECK(skel->bss->parent_cg_id != parent_cg_id, + "parent_cg_id", "%zu != %zu\n", + (size_t)skel->bss->parent_cg_id, (size_t)parent_cg_id); + + CHECK(skel->bss->child_cg_id != child_cg_id, + "child_cg_id", "%zu != %zu\n", + (size_t)skel->bss->child_cg_id, (size_t)child_cg_id); +} + +static void check_sk_pkt_out_cnt(int accept_fd, int cli_fd) +{ + struct bpf_spinlock_cnt pkt_out_cnt = {}, pkt_out_cnt10 = {}; + int err; + + pkt_out_cnt.cnt = ~0; + pkt_out_cnt10.cnt = ~0; + err = bpf_map_lookup_elem(sk_pkt_out_cnt_fd, &accept_fd, &pkt_out_cnt); + if (!err) + err = bpf_map_lookup_elem(sk_pkt_out_cnt10_fd, &accept_fd, + &pkt_out_cnt10); + + /* The bpf prog only counts for fullsock and + * 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 < 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\n", + err, errno, pkt_out_cnt.cnt, pkt_out_cnt10.cnt); + + pkt_out_cnt.cnt = ~0; + pkt_out_cnt10.cnt = ~0; + err = bpf_map_lookup_elem(sk_pkt_out_cnt_fd, &cli_fd, &pkt_out_cnt); + if (!err) + err = bpf_map_lookup_elem(sk_pkt_out_cnt10_fd, &cli_fd, + &pkt_out_cnt10); + /* Active connection is fullsock from the beginning. + * 1 SYN and 1 ACK during 3WHS + * 2 Acks on data packet. + * + * The bpf_prog initialized it to 0xeB9F. + */ + 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\n", + err, errno, pkt_out_cnt.cnt, pkt_out_cnt10.cnt); +} + +static int init_sk_storage(int sk_fd, __u32 pkt_out_cnt) +{ + struct bpf_spinlock_cnt scnt = {}; + int err; + + scnt.cnt = pkt_out_cnt; + err = bpf_map_update_elem(sk_pkt_out_cnt_fd, &sk_fd, &scnt, + BPF_NOEXIST); + if (CHECK(err, "bpf_map_update_elem(sk_pkt_out_cnt_fd)", + "err:%d errno:%d\n", err, errno)) + return err; + + err = bpf_map_update_elem(sk_pkt_out_cnt10_fd, &sk_fd, &scnt, + BPF_NOEXIST); + 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 = -1, cli_fd = -1, accept_fd = -1, err, i; + socklen_t addrlen = sizeof(struct sockaddr_in6); + char buf[DATA_LEN]; + + /* Prepare listen_fd */ + listen_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0xcafe, 0); + /* start_server() has logged the error details */ + if (CHECK_FAIL(listen_fd == -1)) + goto done; + + err = getsockname(listen_fd, (struct sockaddr *)&srv_sa6, &addrlen); + 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)); + + cli_fd = connect_to_fd(listen_fd, 0); + if (CHECK_FAIL(cli_fd == -1)) + goto done; + + err = getsockname(cli_fd, (struct sockaddr *)&cli_sa6, &addrlen); + if (CHECK(err, "getsockname(cli_fd)", "err:%d errno:%d\n", + err, errno)) + goto done; + + accept_fd = accept(listen_fd, NULL, NULL); + if (CHECK(accept_fd == -1, "accept(listen_fd)", + "accept_fd:%d errno:%d\n", + accept_fd, errno)) + goto done; + + if (init_sk_storage(accept_fd, 0xeB9F)) + goto done; + + for (i = 0; i < 2; i++) { + /* 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; + + 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); + check_result(); + +done: + if (accept_fd != -1) + close(accept_fd); + if (cli_fd != -1) + close(cli_fd); + if (listen_fd != -1) + close(listen_fd); +} + +void test_sock_fields(void) +{ + int parent_cg_fd = -1, child_cg_fd = -1; + struct bpf_link *link; + + /* Use a dedicated netns to have a fixed listen port */ + if (!create_netns()) + return; + + /* Create a cgroup, get fd, and join it */ + parent_cg_fd = test__join_cgroup(PARENT_CGROUP); + if (CHECK_FAIL(parent_cg_fd < 0)) + return; + parent_cg_id = get_cgroup_id(PARENT_CGROUP); + if (CHECK_FAIL(!parent_cg_id)) + goto done; + + child_cg_fd = test__join_cgroup(CHILD_CGROUP); + if (CHECK_FAIL(child_cg_fd < 0)) + goto done; + child_cg_id = get_cgroup_id(CHILD_CGROUP); + if (CHECK_FAIL(!child_cg_id)) + goto done; + + skel = test_sock_fields__open_and_load(); + if (CHECK(!skel, "test_sock_fields__open_and_load", "failed\n")) + goto done; + + link = bpf_program__attach_cgroup(skel->progs.egress_read_sock_fields, child_cg_fd); + if (!ASSERT_OK_PTR(link, "attach_cgroup(egress_read_sock_fields)")) + goto done; + skel->links.egress_read_sock_fields = link; + + link = bpf_program__attach_cgroup(skel->progs.ingress_read_sock_fields, child_cg_fd); + if (!ASSERT_OK_PTR(link, "attach_cgroup(ingress_read_sock_fields)")) + goto done; + skel->links.ingress_read_sock_fields = link; + + link = bpf_program__attach_cgroup(skel->progs.read_sk_dst_port, child_cg_fd); + if (!ASSERT_OK_PTR(link, "attach_cgroup(read_sk_dst_port")) + goto done; + skel->links.read_sk_dst_port = link; + + 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(); + +done: + test_sock_fields__detach(skel); + test_sock_fields__destroy(skel); + if (child_cg_fd != -1) + close(child_cg_fd); + if (parent_cg_fd != -1) + close(parent_cg_fd); +} |