bpf: Add test_sock_fields for skb->sk and bpf_tcp_sock
This patch adds a C program to show the usage on skb->sk and bpf_tcp_sock. Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Martin KaFai Lau
Alexei Starovoitov
parent
fb47d1d931
commit
e0b27b3f97
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@ -23,7 +23,7 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
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test_align test_verifier_log test_dev_cgroup test_tcpbpf_user \
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test_sock test_btf test_sockmap test_lirc_mode2_user get_cgroup_id_user \
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test_socket_cookie test_cgroup_storage test_select_reuseport test_section_names \
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test_netcnt test_tcpnotify_user
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test_netcnt test_tcpnotify_user test_sock_fields
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BPF_OBJ_FILES = \
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test_xdp_redirect.o test_xdp_meta.o sockmap_parse_prog.o \
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@ -35,7 +35,8 @@ BPF_OBJ_FILES = \
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sendmsg4_prog.o sendmsg6_prog.o test_lirc_mode2_kern.o \
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get_cgroup_id_kern.o socket_cookie_prog.o test_select_reuseport_kern.o \
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test_skb_cgroup_id_kern.o bpf_flow.o netcnt_prog.o test_xdp_vlan.o \
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xdp_dummy.o test_map_in_map.o test_spin_lock.o test_map_lock.o
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xdp_dummy.o test_map_in_map.o test_spin_lock.o test_map_lock.o \
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test_sock_fields_kern.o
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# Objects are built with default compilation flags and with sub-register
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# code-gen enabled.
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@ -111,6 +112,7 @@ $(OUTPUT)/test_progs: trace_helpers.c
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$(OUTPUT)/get_cgroup_id_user: cgroup_helpers.c
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$(OUTPUT)/test_cgroup_storage: cgroup_helpers.c
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$(OUTPUT)/test_netcnt: cgroup_helpers.c
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$(OUTPUT)/test_sock_fields: cgroup_helpers.c
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.PHONY: force
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@ -176,6 +176,10 @@ static void (*bpf_spin_lock)(struct bpf_spin_lock *lock) =
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(void *) BPF_FUNC_spin_lock;
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static void (*bpf_spin_unlock)(struct bpf_spin_lock *lock) =
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(void *) BPF_FUNC_spin_unlock;
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static struct bpf_sock *(*bpf_sk_fullsock)(struct bpf_sock *sk) =
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(void *) BPF_FUNC_sk_fullsock;
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static struct bpf_tcp_sock *(*bpf_tcp_sock)(struct bpf_sock *sk) =
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(void *) BPF_FUNC_tcp_sock;
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/* llvm builtin functions that eBPF C program may use to
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* emit BPF_LD_ABS and BPF_LD_IND instructions
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@ -0,0 +1,327 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2019 Facebook */
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#include <sys/socket.h>
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#include <sys/epoll.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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#include "cgroup_helpers.h"
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enum bpf_array_idx {
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SRV_IDX,
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CLI_IDX,
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__NR_BPF_ARRAY_IDX,
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};
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#define CHECK(condition, tag, format...) ({ \
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int __ret = !!(condition); \
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if (__ret) { \
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printf("%s(%d):FAIL:%s ", __func__, __LINE__, tag); \
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printf(format); \
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printf("\n"); \
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exit(-1); \
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} \
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})
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#define TEST_CGROUP "/test-bpf-sock-fields"
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#define DATA "Hello BPF!"
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#define DATA_LEN sizeof(DATA)
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static struct sockaddr_in6 srv_sa6, cli_sa6;
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static int linum_map_fd;
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static int addr_map_fd;
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static int tp_map_fd;
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static int sk_map_fd;
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static __u32 srv_idx = SRV_IDX;
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static __u32 cli_idx = CLI_IDX;
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static void init_loopback6(struct sockaddr_in6 *sa6)
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{
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memset(sa6, 0, sizeof(*sa6));
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sa6->sin6_family = AF_INET6;
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sa6->sin6_addr = in6addr_loopback;
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}
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static void print_sk(const struct bpf_sock *sk)
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{
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char src_ip4[24], dst_ip4[24];
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char src_ip6[64], dst_ip6[64];
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inet_ntop(AF_INET, &sk->src_ip4, src_ip4, sizeof(src_ip4));
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inet_ntop(AF_INET6, &sk->src_ip6, src_ip6, sizeof(src_ip6));
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inet_ntop(AF_INET, &sk->dst_ip4, dst_ip4, sizeof(dst_ip4));
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inet_ntop(AF_INET6, &sk->dst_ip6, dst_ip6, sizeof(dst_ip6));
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printf("state:%u bound_dev_if:%u family:%u type:%u protocol:%u mark:%u priority:%u "
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"src_ip4:%x(%s) src_ip6:%x:%x:%x:%x(%s) src_port:%u "
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"dst_ip4:%x(%s) dst_ip6:%x:%x:%x:%x(%s) dst_port:%u\n",
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sk->state, sk->bound_dev_if, sk->family, sk->type, sk->protocol,
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sk->mark, sk->priority,
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sk->src_ip4, src_ip4,
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sk->src_ip6[0], sk->src_ip6[1], sk->src_ip6[2], sk->src_ip6[3],
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src_ip6, sk->src_port,
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sk->dst_ip4, dst_ip4,
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sk->dst_ip6[0], sk->dst_ip6[1], sk->dst_ip6[2], sk->dst_ip6[3],
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dst_ip6, ntohs(sk->dst_port));
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}
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static void print_tp(const struct bpf_tcp_sock *tp)
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{
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printf("snd_cwnd:%u srtt_us:%u rtt_min:%u snd_ssthresh:%u rcv_nxt:%u "
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"snd_nxt:%u snd:una:%u mss_cache:%u ecn_flags:%u "
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"rate_delivered:%u rate_interval_us:%u packets_out:%u "
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"retrans_out:%u total_retrans:%u segs_in:%u data_segs_in:%u "
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"segs_out:%u data_segs_out:%u lost_out:%u sacked_out:%u "
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"bytes_received:%llu bytes_acked:%llu\n",
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tp->snd_cwnd, tp->srtt_us, tp->rtt_min, tp->snd_ssthresh,
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tp->rcv_nxt, tp->snd_nxt, tp->snd_una, tp->mss_cache,
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tp->ecn_flags, tp->rate_delivered, tp->rate_interval_us,
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tp->packets_out, tp->retrans_out, tp->total_retrans,
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tp->segs_in, tp->data_segs_in, tp->segs_out,
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tp->data_segs_out, tp->lost_out, tp->sacked_out,
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tp->bytes_received, tp->bytes_acked);
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}
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static void check_result(void)
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{
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struct bpf_tcp_sock srv_tp, cli_tp;
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struct bpf_sock srv_sk, cli_sk;
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__u32 linum, idx0 = 0;
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int err;
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err = bpf_map_lookup_elem(linum_map_fd, &idx0, &linum);
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CHECK(err == -1, "bpf_map_lookup_elem(linum_map_fd)",
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"err:%d errno:%d", err, errno);
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err = bpf_map_lookup_elem(sk_map_fd, &srv_idx, &srv_sk);
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CHECK(err == -1, "bpf_map_lookup_elem(sk_map_fd, &srv_idx)",
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"err:%d errno:%d", err, errno);
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err = bpf_map_lookup_elem(tp_map_fd, &srv_idx, &srv_tp);
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CHECK(err == -1, "bpf_map_lookup_elem(tp_map_fd, &srv_idx)",
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"err:%d errno:%d", err, errno);
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err = bpf_map_lookup_elem(sk_map_fd, &cli_idx, &cli_sk);
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CHECK(err == -1, "bpf_map_lookup_elem(sk_map_fd, &cli_idx)",
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"err:%d errno:%d", err, errno);
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err = bpf_map_lookup_elem(tp_map_fd, &cli_idx, &cli_tp);
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CHECK(err == -1, "bpf_map_lookup_elem(tp_map_fd, &cli_idx)",
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"err:%d errno:%d", err, errno);
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printf("srv_sk: ");
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print_sk(&srv_sk);
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printf("\n");
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printf("cli_sk: ");
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print_sk(&cli_sk);
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printf("\n");
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printf("srv_tp: ");
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print_tp(&srv_tp);
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printf("\n");
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printf("cli_tp: ");
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print_tp(&cli_tp);
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printf("\n");
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CHECK(srv_sk.state == 10 ||
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!srv_sk.state ||
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srv_sk.family != AF_INET6 ||
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srv_sk.protocol != IPPROTO_TCP ||
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memcmp(srv_sk.src_ip6, &in6addr_loopback,
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sizeof(srv_sk.src_ip6)) ||
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memcmp(srv_sk.dst_ip6, &in6addr_loopback,
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sizeof(srv_sk.dst_ip6)) ||
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srv_sk.src_port != ntohs(srv_sa6.sin6_port) ||
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srv_sk.dst_port != cli_sa6.sin6_port,
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"Unexpected srv_sk", "Check srv_sk output. linum:%u", linum);
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CHECK(cli_sk.state == 10 ||
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!cli_sk.state ||
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cli_sk.family != AF_INET6 ||
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cli_sk.protocol != IPPROTO_TCP ||
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memcmp(cli_sk.src_ip6, &in6addr_loopback,
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sizeof(cli_sk.src_ip6)) ||
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memcmp(cli_sk.dst_ip6, &in6addr_loopback,
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sizeof(cli_sk.dst_ip6)) ||
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cli_sk.src_port != ntohs(cli_sa6.sin6_port) ||
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cli_sk.dst_port != srv_sa6.sin6_port,
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"Unexpected cli_sk", "Check cli_sk output. linum:%u", linum);
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CHECK(srv_tp.data_segs_out != 1 ||
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srv_tp.data_segs_in ||
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srv_tp.snd_cwnd != 10 ||
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srv_tp.total_retrans ||
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srv_tp.bytes_acked != DATA_LEN,
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"Unexpected srv_tp", "Check srv_tp output. linum:%u", linum);
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CHECK(cli_tp.data_segs_out ||
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cli_tp.data_segs_in != 1 ||
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cli_tp.snd_cwnd != 10 ||
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cli_tp.total_retrans ||
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cli_tp.bytes_received != DATA_LEN,
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"Unexpected cli_tp", "Check cli_tp output. linum:%u", linum);
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}
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static void test(void)
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{
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int listen_fd, cli_fd, accept_fd, epfd, err;
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struct epoll_event ev;
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socklen_t addrlen;
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addrlen = sizeof(struct sockaddr_in6);
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ev.events = EPOLLIN;
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epfd = epoll_create(1);
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CHECK(epfd == -1, "epoll_create()", "epfd:%d errno:%d", epfd, errno);
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/* Prepare listen_fd */
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listen_fd = socket(AF_INET6, SOCK_STREAM | SOCK_NONBLOCK, 0);
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CHECK(listen_fd == -1, "socket()", "listen_fd:%d errno:%d",
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listen_fd, errno);
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init_loopback6(&srv_sa6);
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err = bind(listen_fd, (struct sockaddr *)&srv_sa6, sizeof(srv_sa6));
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CHECK(err, "bind(listen_fd)", "err:%d errno:%d", err, errno);
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err = getsockname(listen_fd, (struct sockaddr *)&srv_sa6, &addrlen);
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CHECK(err, "getsockname(listen_fd)", "err:%d errno:%d", err, errno);
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err = listen(listen_fd, 1);
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CHECK(err, "listen(listen_fd)", "err:%d errno:%d", err, errno);
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/* Prepare cli_fd */
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cli_fd = socket(AF_INET6, SOCK_STREAM | SOCK_NONBLOCK, 0);
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CHECK(cli_fd == -1, "socket()", "cli_fd:%d errno:%d", cli_fd, errno);
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init_loopback6(&cli_sa6);
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err = bind(cli_fd, (struct sockaddr *)&cli_sa6, sizeof(cli_sa6));
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CHECK(err, "bind(cli_fd)", "err:%d errno:%d", err, errno);
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err = getsockname(cli_fd, (struct sockaddr *)&cli_sa6, &addrlen);
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CHECK(err, "getsockname(cli_fd)", "err:%d errno:%d",
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err, errno);
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/* Update addr_map with srv_sa6 and cli_sa6 */
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err = bpf_map_update_elem(addr_map_fd, &srv_idx, &srv_sa6, 0);
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CHECK(err, "map_update", "err:%d errno:%d", err, errno);
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err = bpf_map_update_elem(addr_map_fd, &cli_idx, &cli_sa6, 0);
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CHECK(err, "map_update", "err:%d errno:%d", err, errno);
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/* Connect from cli_sa6 to srv_sa6 */
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err = connect(cli_fd, (struct sockaddr *)&srv_sa6, addrlen);
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printf("srv_sa6.sin6_port:%u cli_sa6.sin6_port:%u\n\n",
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ntohs(srv_sa6.sin6_port), ntohs(cli_sa6.sin6_port));
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CHECK(err && errno != EINPROGRESS,
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"connect(cli_fd)", "err:%d errno:%d", err, errno);
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ev.data.fd = listen_fd;
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err = epoll_ctl(epfd, EPOLL_CTL_ADD, listen_fd, &ev);
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CHECK(err, "epoll_ctl(EPOLL_CTL_ADD, listen_fd)", "err:%d errno:%d",
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err, errno);
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/* Accept the connection */
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/* Have some timeout in accept(listen_fd). Just in case. */
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err = epoll_wait(epfd, &ev, 1, 1000);
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CHECK(err != 1 || ev.data.fd != listen_fd,
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"epoll_wait(listen_fd)",
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"err:%d errno:%d ev.data.fd:%d listen_fd:%d",
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err, errno, ev.data.fd, listen_fd);
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accept_fd = accept(listen_fd, NULL, NULL);
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CHECK(accept_fd == -1, "accept(listen_fd)", "accept_fd:%d errno:%d",
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accept_fd, errno);
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close(listen_fd);
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/* Send some data from accept_fd to cli_fd */
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err = send(accept_fd, DATA, DATA_LEN, 0);
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CHECK(err != DATA_LEN, "send(accept_fd)", "err:%d errno:%d",
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err, errno);
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/* Have some timeout in recv(cli_fd). Just in case. */
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ev.data.fd = cli_fd;
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err = epoll_ctl(epfd, EPOLL_CTL_ADD, cli_fd, &ev);
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CHECK(err, "epoll_ctl(EPOLL_CTL_ADD, cli_fd)", "err:%d errno:%d",
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err, errno);
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err = epoll_wait(epfd, &ev, 1, 1000);
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CHECK(err != 1 || ev.data.fd != cli_fd,
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"epoll_wait(cli_fd)", "err:%d errno:%d ev.data.fd:%d cli_fd:%d",
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err, errno, ev.data.fd, cli_fd);
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err = recv(cli_fd, NULL, 0, MSG_TRUNC);
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CHECK(err, "recv(cli_fd)", "err:%d errno:%d", err, errno);
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close(epfd);
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close(accept_fd);
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close(cli_fd);
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check_result();
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}
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int main(int argc, char **argv)
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{
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struct bpf_prog_load_attr attr = {
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.file = "test_sock_fields_kern.o",
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.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
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.expected_attach_type = BPF_CGROUP_INET_EGRESS,
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};
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int cgroup_fd, prog_fd, err;
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struct bpf_object *obj;
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struct bpf_map *map;
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err = setup_cgroup_environment();
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CHECK(err, "setup_cgroup_environment()", "err:%d errno:%d",
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err, errno);
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atexit(cleanup_cgroup_environment);
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/* Create a cgroup, get fd, and join it */
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cgroup_fd = create_and_get_cgroup(TEST_CGROUP);
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CHECK(cgroup_fd == -1, "create_and_get_cgroup()",
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"cgroup_fd:%d errno:%d", cgroup_fd, errno);
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err = join_cgroup(TEST_CGROUP);
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CHECK(err, "join_cgroup", "err:%d errno:%d", err, errno);
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err = bpf_prog_load_xattr(&attr, &obj, &prog_fd);
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CHECK(err, "bpf_prog_load_xattr()", "err:%d", err);
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err = bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_INET_EGRESS, 0);
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CHECK(err == -1, "bpf_prog_attach(CPF_CGROUP_INET_EGRESS)",
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"err:%d errno%d", err, errno);
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close(cgroup_fd);
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map = bpf_object__find_map_by_name(obj, "addr_map");
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CHECK(!map, "cannot find addr_map", "(null)");
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addr_map_fd = bpf_map__fd(map);
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map = bpf_object__find_map_by_name(obj, "sock_result_map");
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CHECK(!map, "cannot find sock_result_map", "(null)");
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sk_map_fd = bpf_map__fd(map);
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map = bpf_object__find_map_by_name(obj, "tcp_sock_result_map");
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CHECK(!map, "cannot find tcp_sock_result_map", "(null)");
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tp_map_fd = bpf_map__fd(map);
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map = bpf_object__find_map_by_name(obj, "linum_map");
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CHECK(!map, "cannot find linum_map", "(null)");
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linum_map_fd = bpf_map__fd(map);
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test();
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bpf_object__close(obj);
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cleanup_cgroup_environment();
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printf("PASS\n");
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return 0;
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}
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@ -0,0 +1,152 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2019 Facebook */
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#include <linux/bpf.h>
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#include <netinet/in.h>
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#include <stdbool.h>
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|
||||
#include "bpf_helpers.h"
|
||||
#include "bpf_endian.h"
|
||||
|
||||
enum bpf_array_idx {
|
||||
SRV_IDX,
|
||||
CLI_IDX,
|
||||
__NR_BPF_ARRAY_IDX,
|
||||
};
|
||||
|
||||
struct bpf_map_def SEC("maps") addr_map = {
|
||||
.type = BPF_MAP_TYPE_ARRAY,
|
||||
.key_size = sizeof(__u32),
|
||||
.value_size = sizeof(struct sockaddr_in6),
|
||||
.max_entries = __NR_BPF_ARRAY_IDX,
|
||||
};
|
||||
|
||||
struct bpf_map_def SEC("maps") sock_result_map = {
|
||||
.type = BPF_MAP_TYPE_ARRAY,
|
||||
.key_size = sizeof(__u32),
|
||||
.value_size = sizeof(struct bpf_sock),
|
||||
.max_entries = __NR_BPF_ARRAY_IDX,
|
||||
};
|
||||
|
||||
struct bpf_map_def SEC("maps") tcp_sock_result_map = {
|
||||
.type = BPF_MAP_TYPE_ARRAY,
|
||||
.key_size = sizeof(__u32),
|
||||
.value_size = sizeof(struct bpf_tcp_sock),
|
||||
.max_entries = __NR_BPF_ARRAY_IDX,
|
||||
};
|
||||
|
||||
struct bpf_map_def SEC("maps") linum_map = {
|
||||
.type = BPF_MAP_TYPE_ARRAY,
|
||||
.key_size = sizeof(__u32),
|
||||
.value_size = sizeof(__u32),
|
||||
.max_entries = 1,
|
||||
};
|
||||
|
||||
static bool is_loopback6(__u32 *a6)
|
||||
{
|
||||
return !a6[0] && !a6[1] && !a6[2] && a6[3] == bpf_htonl(1);
|
||||
}
|
||||
|
||||
static void skcpy(struct bpf_sock *dst,
|
||||
const struct bpf_sock *src)
|
||||
{
|
||||
dst->bound_dev_if = src->bound_dev_if;
|
||||
dst->family = src->family;
|
||||
dst->type = src->type;
|
||||
dst->protocol = src->protocol;
|
||||
dst->mark = src->mark;
|
||||
dst->priority = src->priority;
|
||||
dst->src_ip4 = src->src_ip4;
|
||||
dst->src_ip6[0] = src->src_ip6[0];
|
||||
dst->src_ip6[1] = src->src_ip6[1];
|
||||
dst->src_ip6[2] = src->src_ip6[2];
|
||||
dst->src_ip6[3] = src->src_ip6[3];
|
||||
dst->src_port = src->src_port;
|
||||
dst->dst_ip4 = src->dst_ip4;
|
||||
dst->dst_ip6[0] = src->dst_ip6[0];
|
||||
dst->dst_ip6[1] = src->dst_ip6[1];
|
||||
dst->dst_ip6[2] = src->dst_ip6[2];
|
||||
dst->dst_ip6[3] = src->dst_ip6[3];
|
||||
dst->dst_port = src->dst_port;
|
||||
dst->state = src->state;
|
||||
}
|
||||
|
||||
static void tpcpy(struct bpf_tcp_sock *dst,
|
||||
const struct bpf_tcp_sock *src)
|
||||
{
|
||||
dst->snd_cwnd = src->snd_cwnd;
|
||||
dst->srtt_us = src->srtt_us;
|
||||
dst->rtt_min = src->rtt_min;
|
||||
dst->snd_ssthresh = src->snd_ssthresh;
|
||||
dst->rcv_nxt = src->rcv_nxt;
|
||||
dst->snd_nxt = src->snd_nxt;
|
||||
dst->snd_una = src->snd_una;
|
||||
dst->mss_cache = src->mss_cache;
|
||||
dst->ecn_flags = src->ecn_flags;
|
||||
dst->rate_delivered = src->rate_delivered;
|
||||
dst->rate_interval_us = src->rate_interval_us;
|
||||
dst->packets_out = src->packets_out;
|
||||
dst->retrans_out = src->retrans_out;
|
||||
dst->total_retrans = src->total_retrans;
|
||||
dst->segs_in = src->segs_in;
|
||||
dst->data_segs_in = src->data_segs_in;
|
||||
dst->segs_out = src->segs_out;
|
||||
dst->data_segs_out = src->data_segs_out;
|
||||
dst->lost_out = src->lost_out;
|
||||
dst->sacked_out = src->sacked_out;
|
||||
dst->bytes_received = src->bytes_received;
|
||||
dst->bytes_acked = src->bytes_acked;
|
||||
}
|
||||
|
||||
#define RETURN { \
|
||||
linum = __LINE__; \
|
||||
bpf_map_update_elem(&linum_map, &idx0, &linum, 0); \
|
||||
return 1; \
|
||||
}
|
||||
|
||||
SEC("cgroup_skb/egress")
|
||||
int read_sock_fields(struct __sk_buff *skb)
|
||||
{
|
||||
__u32 srv_idx = SRV_IDX, cli_idx = CLI_IDX, idx;
|
||||
struct sockaddr_in6 *srv_sa6, *cli_sa6;
|
||||
struct bpf_tcp_sock *tp, *tp_ret;
|
||||
struct bpf_sock *sk, *sk_ret;
|
||||
__u32 linum, idx0 = 0;
|
||||
|
||||
sk = skb->sk;
|
||||
if (!sk || sk->state == 10)
|
||||
RETURN;
|
||||
|
||||
sk = bpf_sk_fullsock(sk);
|
||||
if (!sk || sk->family != AF_INET6 || sk->protocol != IPPROTO_TCP ||
|
||||
!is_loopback6(sk->src_ip6))
|
||||
RETURN;
|
||||
|
||||
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))
|
||||
idx = srv_idx;
|
||||
else if (sk->src_port == bpf_ntohs(cli_sa6->sin6_port))
|
||||
idx = cli_idx;
|
||||
else
|
||||
RETURN;
|
||||
|
||||
sk_ret = bpf_map_lookup_elem(&sock_result_map, &idx);
|
||||
tp_ret = bpf_map_lookup_elem(&tcp_sock_result_map, &idx);
|
||||
if (!sk_ret || !tp_ret)
|
||||
RETURN;
|
||||
|
||||
skcpy(sk_ret, sk);
|
||||
tpcpy(tp_ret, tp);
|
||||
|
||||
RETURN;
|
||||
}
|
||||
|
||||
char _license[] SEC("license") = "GPL";
|
||||
Loading…
Reference in New Issue