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78d8e26d46
Cover new TCP-BPF callback in test_tcpbpf: when listen() is called on socket, set BPF_SOCK_OPS_STATE_CB_FLAG so that BPF_SOCK_OPS_STATE_CB callback can be called on future state transition, and when such a transition happens (TCP_LISTEN -> TCP_CLOSE), track it in the map and verify it in user space later. Signed-off-by: Andrey Ignatov <rdna@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <stddef.h>
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#include <string.h>
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#include <linux/bpf.h>
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#include <linux/if_ether.h>
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#include <linux/if_packet.h>
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#include <linux/ip.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/tcp.h>
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#include <netinet/in.h>
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#include "bpf_helpers.h"
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#include "bpf_endian.h"
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#include "test_tcpbpf.h"
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struct bpf_map_def SEC("maps") global_map = {
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.type = BPF_MAP_TYPE_ARRAY,
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.key_size = sizeof(__u32),
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.value_size = sizeof(struct tcpbpf_globals),
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.max_entries = 2,
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};
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static inline void update_event_map(int event)
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{
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__u32 key = 0;
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struct tcpbpf_globals g, *gp;
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gp = bpf_map_lookup_elem(&global_map, &key);
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if (gp == NULL) {
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struct tcpbpf_globals g = {0};
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g.event_map |= (1 << event);
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bpf_map_update_elem(&global_map, &key, &g,
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BPF_ANY);
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} else {
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g = *gp;
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g.event_map |= (1 << event);
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bpf_map_update_elem(&global_map, &key, &g,
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BPF_ANY);
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}
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}
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int _version SEC("version") = 1;
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SEC("sockops")
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int bpf_testcb(struct bpf_sock_ops *skops)
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{
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int rv = -1;
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int bad_call_rv = 0;
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int good_call_rv = 0;
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int op;
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int v = 0;
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op = (int) skops->op;
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update_event_map(op);
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switch (op) {
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case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
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/* Test failure to set largest cb flag (assumes not defined) */
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bad_call_rv = bpf_sock_ops_cb_flags_set(skops, 0x80);
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/* Set callback */
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good_call_rv = bpf_sock_ops_cb_flags_set(skops,
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BPF_SOCK_OPS_STATE_CB_FLAG);
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/* Update results */
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{
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__u32 key = 0;
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struct tcpbpf_globals g, *gp;
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gp = bpf_map_lookup_elem(&global_map, &key);
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if (!gp)
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break;
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g = *gp;
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g.bad_cb_test_rv = bad_call_rv;
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g.good_cb_test_rv = good_call_rv;
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bpf_map_update_elem(&global_map, &key, &g,
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BPF_ANY);
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}
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break;
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case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
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skops->sk_txhash = 0x12345f;
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v = 0xff;
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rv = bpf_setsockopt(skops, SOL_IPV6, IPV6_TCLASS, &v,
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sizeof(v));
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break;
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case BPF_SOCK_OPS_RTO_CB:
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break;
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case BPF_SOCK_OPS_RETRANS_CB:
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break;
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case BPF_SOCK_OPS_STATE_CB:
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if (skops->args[1] == BPF_TCP_CLOSE) {
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__u32 key = 0;
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struct tcpbpf_globals g, *gp;
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gp = bpf_map_lookup_elem(&global_map, &key);
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if (!gp)
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break;
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g = *gp;
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if (skops->args[0] == BPF_TCP_LISTEN) {
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g.num_listen++;
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} else {
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g.total_retrans = skops->total_retrans;
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g.data_segs_in = skops->data_segs_in;
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g.data_segs_out = skops->data_segs_out;
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g.bytes_received = skops->bytes_received;
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g.bytes_acked = skops->bytes_acked;
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}
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bpf_map_update_elem(&global_map, &key, &g,
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BPF_ANY);
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}
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break;
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case BPF_SOCK_OPS_TCP_LISTEN_CB:
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bpf_sock_ops_cb_flags_set(skops, BPF_SOCK_OPS_STATE_CB_FLAG);
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break;
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default:
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rv = -1;
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}
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skops->reply = rv;
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return 1;
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}
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char _license[] SEC("license") = "GPL";
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