tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include <stddef.h>
3#include <string.h>
4#include <linux/bpf.h>
5#include <linux/if_ether.h>
6#include <linux/if_packet.h>
7#include <linux/ip.h>
8#include <linux/types.h>
9#include <linux/socket.h>
10#include <linux/tcp.h>
11#include <netinet/in.h>
12#include "bpf_helpers.h"
13#include "bpf_endian.h"
14#include "test_tcpbpf.h"
15
16struct bpf_map_def SEC("maps") global_map = {
17 .type = BPF_MAP_TYPE_ARRAY,
18 .key_size = sizeof(__u32),
19 .value_size = sizeof(struct tcpbpf_globals),
20 .max_entries = 2,
21};
22
23static inline void update_event_map(int event)
24{
25 __u32 key = 0;
26 struct tcpbpf_globals g, *gp;
27
28 gp = bpf_map_lookup_elem(&global_map, &key);
29 if (gp == NULL) {
30 struct tcpbpf_globals g = {0};
31
32 g.event_map |= (1 << event);
33 bpf_map_update_elem(&global_map, &key, &g,
34 BPF_ANY);
35 } else {
36 g = *gp;
37 g.event_map |= (1 << event);
38 bpf_map_update_elem(&global_map, &key, &g,
39 BPF_ANY);
40 }
41}
42
43int _version SEC("version") = 1;
44
45SEC("sockops")
46int bpf_testcb(struct bpf_sock_ops *skops)
47{
48 int rv = -1;
49 int bad_call_rv = 0;
50 int good_call_rv = 0;
51 int op;
52 int v = 0;
53
54 op = (int) skops->op;
55
56 update_event_map(op);
57
58 switch (op) {
59 case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
60 /* Test failure to set largest cb flag (assumes not defined) */
61 bad_call_rv = bpf_sock_ops_cb_flags_set(skops, 0x80);
62 /* Set callback */
63 good_call_rv = bpf_sock_ops_cb_flags_set(skops,
64 BPF_SOCK_OPS_STATE_CB_FLAG);
65 /* Update results */
66 {
67 __u32 key = 0;
68 struct tcpbpf_globals g, *gp;
69
70 gp = bpf_map_lookup_elem(&global_map, &key);
71 if (!gp)
72 break;
73 g = *gp;
74 g.bad_cb_test_rv = bad_call_rv;
75 g.good_cb_test_rv = good_call_rv;
76 bpf_map_update_elem(&global_map, &key, &g,
77 BPF_ANY);
78 }
79 break;
80 case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
81 skops->sk_txhash = 0x12345f;
82 v = 0xff;
83 rv = bpf_setsockopt(skops, SOL_IPV6, IPV6_TCLASS, &v,
84 sizeof(v));
85 break;
86 case BPF_SOCK_OPS_RTO_CB:
87 break;
88 case BPF_SOCK_OPS_RETRANS_CB:
89 break;
90 case BPF_SOCK_OPS_STATE_CB:
91 if (skops->args[1] == BPF_TCP_CLOSE) {
92 __u32 key = 0;
93 struct tcpbpf_globals g, *gp;
94
95 gp = bpf_map_lookup_elem(&global_map, &key);
96 if (!gp)
97 break;
98 g = *gp;
99 if (skops->args[0] == BPF_TCP_LISTEN) {
100 g.num_listen++;
101 } else {
102 g.total_retrans = skops->total_retrans;
103 g.data_segs_in = skops->data_segs_in;
104 g.data_segs_out = skops->data_segs_out;
105 g.bytes_received = skops->bytes_received;
106 g.bytes_acked = skops->bytes_acked;
107 }
108 bpf_map_update_elem(&global_map, &key, &g,
109 BPF_ANY);
110 }
111 break;
112 case BPF_SOCK_OPS_TCP_LISTEN_CB:
113 bpf_sock_ops_cb_flags_set(skops, BPF_SOCK_OPS_STATE_CB_FLAG);
114 break;
115 default:
116 rv = -1;
117 }
118 skops->reply = rv;
119 return 1;
120}
121char _license[] SEC("license") = "GPL";