1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (c) 2017-2018 Covalent IO, Inc. http://covalent.io */
6 #include <linux/if_ether.h>
7 #include <linux/if_packet.h>
9 #include <linux/ipv6.h>
11 #include <linux/udp.h>
12 #include <linux/tcp.h>
13 #include <linux/pkt_cls.h>
14 #include <sys/socket.h>
15 #include <bpf/bpf_helpers.h>
16 #include <bpf/bpf_endian.h>
19 /* Sockmap sample program connects a client and a backend together
22 * client:X <---> frontend:80 client:X <---> backend:80
24 * For simplicity we hard code values here and bind 1:1. The hard
25 * coded values are part of the setup in sockmap.sh script that
26 * is associated with this BPF program.
28 * The bpf_printk is verbose and prints information as connections
29 * are established and verdicts are decided.
33 __uint(type, TEST_MAP_TYPE);
34 __uint(max_entries, 20);
35 __uint(key_size, sizeof(int));
36 __uint(value_size, sizeof(int));
37 } sock_map SEC(".maps");
40 __uint(type, TEST_MAP_TYPE);
41 __uint(max_entries, 20);
42 __uint(key_size, sizeof(int));
43 __uint(value_size, sizeof(int));
44 } sock_map_txmsg SEC(".maps");
47 __uint(type, TEST_MAP_TYPE);
48 __uint(max_entries, 20);
49 __uint(key_size, sizeof(int));
50 __uint(value_size, sizeof(int));
51 } sock_map_redir SEC(".maps");
54 __uint(type, BPF_MAP_TYPE_ARRAY);
55 __uint(max_entries, 1);
58 } sock_apply_bytes SEC(".maps");
61 __uint(type, BPF_MAP_TYPE_ARRAY);
62 __uint(max_entries, 1);
65 } sock_cork_bytes SEC(".maps");
68 __uint(type, BPF_MAP_TYPE_ARRAY);
69 __uint(max_entries, 6);
72 } sock_bytes SEC(".maps");
75 __uint(type, BPF_MAP_TYPE_ARRAY);
76 __uint(max_entries, 1);
79 } sock_redir_flags SEC(".maps");
82 __uint(type, BPF_MAP_TYPE_ARRAY);
83 __uint(max_entries, 3);
86 } sock_skb_opts SEC(".maps");
89 __uint(type, TEST_MAP_TYPE);
90 __uint(max_entries, 20);
91 __uint(key_size, sizeof(int));
92 __uint(value_size, sizeof(int));
93 } tls_sock_map SEC(".maps");
96 int bpf_prog1(struct __sk_buff *skb)
100 f = bpf_map_lookup_elem(&sock_skb_opts, &two);
108 int bpf_prog2(struct __sk_buff *skb)
110 __u32 lport = skb->local_port;
111 __u32 rport = skb->remote_port;
112 int len, *f, ret, zero = 0;
121 len = (__u32)skb->data_end - (__u32)skb->data;
124 f = bpf_map_lookup_elem(&sock_skb_opts, &zero);
131 return bpf_sk_redirect_map(skb, &sock_map, ret, flags);
133 return bpf_sk_redirect_hash(skb, &sock_map, &ret, flags);
138 static inline void bpf_write_pass(struct __sk_buff *skb, int offset)
140 int err = bpf_skb_pull_data(skb, 6 + offset);
147 c = (char *)(long)skb->data;
148 data_end = (void *)(long)skb->data_end;
150 if (c + 5 + offset < data_end)
151 memcpy(c + offset, "PASS", 4);
155 int bpf_prog3(struct __sk_buff *skb)
157 int err, *f, ret = SK_PASS;
160 f = bpf_map_lookup_elem(&sock_skb_opts, &one);
167 err = bpf_skb_adjust_room(skb, -13, 0, 0);
170 err = bpf_skb_adjust_room(skb, 4, 0, 0);
173 bpf_write_pass(skb, 0);
175 return bpf_sk_redirect_map(skb, &tls_sock_map, ret, flags);
177 return bpf_sk_redirect_hash(skb, &tls_sock_map, &ret, flags);
180 f = bpf_map_lookup_elem(&sock_skb_opts, &one);
183 err = bpf_skb_adjust_room(skb, 4, 0, 0);
186 bpf_write_pass(skb, 13);
191 int bpf_sockmap(struct bpf_sock_ops *skops)
196 op = (int) skops->op;
199 case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
200 lport = skops->local_port;
201 rport = skops->remote_port;
203 if (lport == 10000) {
206 err = bpf_sock_map_update(skops, &sock_map, &ret,
209 err = bpf_sock_hash_update(skops, &sock_map, &ret,
214 case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
215 lport = skops->local_port;
216 rport = skops->remote_port;
218 if (bpf_ntohl(rport) == 10001) {
221 err = bpf_sock_map_update(skops, &sock_map, &ret,
224 err = bpf_sock_hash_update(skops, &sock_map, &ret,
239 int bpf_prog4(struct sk_msg_md *msg)
241 int *bytes, zero = 0, one = 1, two = 2, three = 3, four = 4, five = 5;
242 int *start, *end, *start_push, *end_push, *start_pop, *pop, err = 0;
244 bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero);
246 bpf_msg_apply_bytes(msg, *bytes);
247 bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero);
249 bpf_msg_cork_bytes(msg, *bytes);
250 start = bpf_map_lookup_elem(&sock_bytes, &zero);
251 end = bpf_map_lookup_elem(&sock_bytes, &one);
253 bpf_msg_pull_data(msg, *start, *end, 0);
254 start_push = bpf_map_lookup_elem(&sock_bytes, &two);
255 end_push = bpf_map_lookup_elem(&sock_bytes, &three);
256 if (start_push && end_push) {
257 err = bpf_msg_push_data(msg, *start_push, *end_push, 0);
261 start_pop = bpf_map_lookup_elem(&sock_bytes, &four);
262 pop = bpf_map_lookup_elem(&sock_bytes, &five);
263 if (start_pop && pop)
264 bpf_msg_pop_data(msg, *start_pop, *pop, 0);
269 int bpf_prog6(struct sk_msg_md *msg)
271 int zero = 0, one = 1, two = 2, three = 3, four = 4, five = 5, key = 0;
272 int *bytes, *start, *end, *start_push, *end_push, *start_pop, *pop, *f;
276 bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero);
278 bpf_msg_apply_bytes(msg, *bytes);
279 bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero);
281 bpf_msg_cork_bytes(msg, *bytes);
283 start = bpf_map_lookup_elem(&sock_bytes, &zero);
284 end = bpf_map_lookup_elem(&sock_bytes, &one);
286 bpf_msg_pull_data(msg, *start, *end, 0);
288 start_push = bpf_map_lookup_elem(&sock_bytes, &two);
289 end_push = bpf_map_lookup_elem(&sock_bytes, &three);
290 if (start_push && end_push) {
291 err = bpf_msg_push_data(msg, *start_push, *end_push, 0);
296 start_pop = bpf_map_lookup_elem(&sock_bytes, &four);
297 pop = bpf_map_lookup_elem(&sock_bytes, &five);
298 if (start_pop && pop)
299 bpf_msg_pop_data(msg, *start_pop, *pop, 0);
301 f = bpf_map_lookup_elem(&sock_redir_flags, &zero);
307 return bpf_msg_redirect_map(msg, &sock_map_redir, key, flags);
309 return bpf_msg_redirect_hash(msg, &sock_map_redir, &key, flags);
314 int bpf_prog8(struct sk_msg_md *msg)
316 void *data_end = (void *)(long) msg->data_end;
317 void *data = (void *)(long) msg->data;
318 int ret = 0, *bytes, zero = 0;
320 bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero);
322 ret = bpf_msg_apply_bytes(msg, *bytes);
335 int bpf_prog9(struct sk_msg_md *msg)
337 void *data_end = (void *)(long) msg->data_end;
338 void *data = (void *)(long) msg->data;
339 int ret = 0, *bytes, zero = 0;
341 bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero);
343 if (((__u64)data_end - (__u64)data) >= *bytes)
345 ret = bpf_msg_cork_bytes(msg, *bytes);
353 int bpf_prog10(struct sk_msg_md *msg)
355 int *bytes, *start, *end, *start_push, *end_push, *start_pop, *pop;
356 int zero = 0, one = 1, two = 2, three = 3, four = 4, five = 5, err = 0;
358 bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero);
360 bpf_msg_apply_bytes(msg, *bytes);
361 bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero);
363 bpf_msg_cork_bytes(msg, *bytes);
364 start = bpf_map_lookup_elem(&sock_bytes, &zero);
365 end = bpf_map_lookup_elem(&sock_bytes, &one);
367 bpf_msg_pull_data(msg, *start, *end, 0);
368 start_push = bpf_map_lookup_elem(&sock_bytes, &two);
369 end_push = bpf_map_lookup_elem(&sock_bytes, &three);
370 if (start_push && end_push) {
371 err = bpf_msg_push_data(msg, *start_push, *end_push, 0);
375 start_pop = bpf_map_lookup_elem(&sock_bytes, &four);
376 pop = bpf_map_lookup_elem(&sock_bytes, &five);
377 if (start_pop && pop)
378 bpf_msg_pop_data(msg, *start_pop, *pop, 0);
382 char _license[] SEC("license") = "GPL";