1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include <stddef.h> |
3 | #include <string.h> |
4 | #include <netinet/in.h> |
5 | #include <linux/bpf.h> |
6 | #include <linux/if_ether.h> |
7 | #include <linux/if_packet.h> |
8 | #include <linux/ip.h> |
9 | #include <linux/ipv6.h> |
10 | #include <linux/types.h> |
11 | #include <linux/socket.h> |
12 | #include <linux/tcp.h> |
13 | #include <bpf/bpf_helpers.h> |
14 | #include <bpf/bpf_endian.h> |
15 | #include "test_tcpnotify.h" |
16 | |
17 | struct { |
18 | __uint(type, BPF_MAP_TYPE_ARRAY); |
19 | __uint(max_entries, 4); |
20 | __type(key, __u32); |
21 | __type(value, struct tcpnotify_globals); |
22 | } global_map SEC(".maps" ); |
23 | |
24 | struct { |
25 | __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); |
26 | __uint(max_entries, 2); |
27 | __type(key, int); |
28 | __type(value, __u32); |
29 | } perf_event_map SEC(".maps" ); |
30 | |
31 | SEC("sockops" ) |
32 | int bpf_testcb(struct bpf_sock_ops *skops) |
33 | { |
34 | int rv = -1; |
35 | int op; |
36 | |
37 | op = (int) skops->op; |
38 | |
39 | if (bpf_ntohl(skops->remote_port) != TESTPORT) { |
40 | skops->reply = -1; |
41 | return 0; |
42 | } |
43 | |
44 | switch (op) { |
45 | case BPF_SOCK_OPS_TIMEOUT_INIT: |
46 | case BPF_SOCK_OPS_RWND_INIT: |
47 | case BPF_SOCK_OPS_NEEDS_ECN: |
48 | case BPF_SOCK_OPS_BASE_RTT: |
49 | case BPF_SOCK_OPS_RTO_CB: |
50 | rv = 1; |
51 | break; |
52 | |
53 | case BPF_SOCK_OPS_TCP_CONNECT_CB: |
54 | case BPF_SOCK_OPS_TCP_LISTEN_CB: |
55 | case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB: |
56 | case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB: |
57 | bpf_sock_ops_cb_flags_set(skops, (BPF_SOCK_OPS_RETRANS_CB_FLAG| |
58 | BPF_SOCK_OPS_RTO_CB_FLAG)); |
59 | rv = 1; |
60 | break; |
61 | case BPF_SOCK_OPS_RETRANS_CB: { |
62 | __u32 key = 0; |
63 | struct tcpnotify_globals g, *gp; |
64 | struct tcp_notifier msg = { |
65 | .type = 0xde, |
66 | .subtype = 0xad, |
67 | .source = 0xbe, |
68 | .hash = 0xef, |
69 | }; |
70 | |
71 | rv = 1; |
72 | |
73 | /* Update results */ |
74 | gp = bpf_map_lookup_elem(&global_map, &key); |
75 | if (!gp) |
76 | break; |
77 | g = *gp; |
78 | g.total_retrans = skops->total_retrans; |
79 | g.ncalls++; |
80 | bpf_map_update_elem(&global_map, &key, &g, |
81 | BPF_ANY); |
82 | bpf_perf_event_output(skops, &perf_event_map, |
83 | BPF_F_CURRENT_CPU, |
84 | &msg, sizeof(msg)); |
85 | } |
86 | break; |
87 | default: |
88 | rv = -1; |
89 | } |
90 | skops->reply = rv; |
91 | return 1; |
92 | } |
93 | char _license[] SEC("license" ) = "GPL" ; |
94 | |