LXR linux/tools/testing/selftests/bpf/progs/test_sockmap

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* Copyright (c) 2017-2018 Covalent IO, Inc. http://covalent.io */
   3#include <stddef.h>
   4#include <string.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/in.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>
  17
  18/* Sockmap sample program connects a client and a backend together
  19 * using cgroups.
  20 *
  21 *    client:X <---> frontend:80 client:X <---> backend:80
  22 *
  23 * For simplicity we hard code values here and bind 1:1. The hard
  24 * coded values are part of the setup in sockmap.sh script that
  25 * is associated with this BPF program.
  26 *
  27 * The bpf_printk is verbose and prints information as connections
  28 * are established and verdicts are decided.
  29 */
  30
  31struct {
  32        __uint(type, TEST_MAP_TYPE);
  33        __uint(max_entries, 20);
  34        __uint(key_size, sizeof(int));
  35        __uint(value_size, sizeof(int));
  36} sock_map SEC(".maps");
  37
  38struct {
  39        __uint(type, TEST_MAP_TYPE);
  40        __uint(max_entries, 20);
  41        __uint(key_size, sizeof(int));
  42        __uint(value_size, sizeof(int));
  43} sock_map_txmsg SEC(".maps");
  44
  45struct {
  46        __uint(type, TEST_MAP_TYPE);
  47        __uint(max_entries, 20);
  48        __uint(key_size, sizeof(int));
  49        __uint(value_size, sizeof(int));
  50} sock_map_redir SEC(".maps");
  51
  52struct {
  53        __uint(type, BPF_MAP_TYPE_ARRAY);
  54        __uint(max_entries, 1);
  55        __type(key, int);
  56        __type(value, int);
  57} sock_apply_bytes SEC(".maps");
  58
  59struct {
  60        __uint(type, BPF_MAP_TYPE_ARRAY);
  61        __uint(max_entries, 1);
  62        __type(key, int);
  63        __type(value, int);
  64} sock_cork_bytes SEC(".maps");
  65
  66struct {
  67        __uint(type, BPF_MAP_TYPE_ARRAY);
  68        __uint(max_entries, 6);
  69        __type(key, int);
  70        __type(value, int);
  71} sock_bytes SEC(".maps");
  72
  73struct {
  74        __uint(type, BPF_MAP_TYPE_ARRAY);
  75        __uint(max_entries, 1);
  76        __type(key, int);
  77        __type(value, int);
  78} sock_redir_flags SEC(".maps");
  79
  80struct {
  81        __uint(type, BPF_MAP_TYPE_ARRAY);
  82        __uint(max_entries, 3);
  83        __type(key, int);
  84        __type(value, int);
  85} sock_skb_opts SEC(".maps");
  86
  87struct {
  88        __uint(type, TEST_MAP_TYPE);
  89        __uint(max_entries, 20);
  90        __uint(key_size, sizeof(int));
  91        __uint(value_size, sizeof(int));
  92} tls_sock_map SEC(".maps");
  93
  94SEC("sk_skb1")
  95int bpf_prog1(struct __sk_buff *skb)
  96{
  97        int *f, two = 2;
  98
  99        f = bpf_map_lookup_elem(&sock_skb_opts, &two);
 100        if (f && *f) {
 101                return *f;
 102        }
 103        return skb->len;
 104}
 105
 106SEC("sk_skb2")
 107int bpf_prog2(struct __sk_buff *skb)
 108{
 109        __u32 lport = skb->local_port;
 110        __u32 rport = skb->remote_port;
 111        int len, *f, ret, zero = 0;
 112        __u64 flags = 0;
 113
 114        if (lport == 10000)
 115                ret = 10;
 116        else
 117                ret = 1;
 118
 119        len = (__u32)skb->data_end - (__u32)skb->data;
 120        f = bpf_map_lookup_elem(&sock_skb_opts, &zero);
 121        if (f && *f) {
 122                ret = 3;
 123                flags = *f;
 124        }
 125
 126#ifdef SOCKMAP
 127        return bpf_sk_redirect_map(skb, &sock_map, ret, flags);
 128#else
 129        return bpf_sk_redirect_hash(skb, &sock_map, &ret, flags);
 130#endif
 131
 132}
 133
 134SEC("sk_skb3")
 135int bpf_prog3(struct __sk_buff *skb)
 136{
 137        const int one = 1;
 138        int err, *f, ret = SK_PASS;
 139        void *data_end;
 140        char *c;
 141
 142        err = bpf_skb_pull_data(skb, 19);
 143        if (err)
 144                goto tls_out;
 145
 146        c = (char *)(long)skb->data;
 147        data_end = (void *)(long)skb->data_end;
 148
 149        if (c + 18 < data_end)
 150                memcpy(&c[13], "PASS", 4);
 151        f = bpf_map_lookup_elem(&sock_skb_opts, &one);
 152        if (f && *f) {
 153                __u64 flags = 0;
 154
 155                ret = 0;
 156                flags = *f;
 157#ifdef SOCKMAP
 158                return bpf_sk_redirect_map(skb, &tls_sock_map, ret, flags);
 159#else
 160                return bpf_sk_redirect_hash(skb, &tls_sock_map, &ret, flags);
 161#endif
 162        }
 163
 164        f = bpf_map_lookup_elem(&sock_skb_opts, &one);
 165        if (f && *f)
 166                ret = SK_DROP;
 167tls_out:
 168        return ret;
 169}
 170
 171SEC("sockops")
 172int bpf_sockmap(struct bpf_sock_ops *skops)
 173{
 174        __u32 lport, rport;
 175        int op, err = 0, index, key, ret;
 176
 177
 178        op = (int) skops->op;
 179
 180        switch (op) {
 181        case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
 182                lport = skops->local_port;
 183                rport = skops->remote_port;
 184
 185                if (lport == 10000) {
 186                        ret = 1;
 187#ifdef SOCKMAP
 188                        err = bpf_sock_map_update(skops, &sock_map, &ret,
 189                                                  BPF_NOEXIST);
 190#else
 191                        err = bpf_sock_hash_update(skops, &sock_map, &ret,
 192                                                   BPF_NOEXIST);
 193#endif
 194                }
 195                break;
 196        case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
 197                lport = skops->local_port;
 198                rport = skops->remote_port;
 199
 200                if (bpf_ntohl(rport) == 10001) {
 201                        ret = 10;
 202#ifdef SOCKMAP
 203                        err = bpf_sock_map_update(skops, &sock_map, &ret,
 204                                                  BPF_NOEXIST);
 205#else
 206                        err = bpf_sock_hash_update(skops, &sock_map, &ret,
 207                                                   BPF_NOEXIST);
 208#endif
 209                }
 210                break;
 211        default:
 212                break;
 213        }
 214
 215        return 0;
 216}
 217
 218SEC("sk_msg1")
 219int bpf_prog4(struct sk_msg_md *msg)
 220{
 221        int *bytes, zero = 0, one = 1, two = 2, three = 3, four = 4, five = 5;
 222        int *start, *end, *start_push, *end_push, *start_pop, *pop;
 223
 224        bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero);
 225        if (bytes)
 226                bpf_msg_apply_bytes(msg, *bytes);
 227        bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero);
 228        if (bytes)
 229                bpf_msg_cork_bytes(msg, *bytes);
 230        start = bpf_map_lookup_elem(&sock_bytes, &zero);
 231        end = bpf_map_lookup_elem(&sock_bytes, &one);
 232        if (start && end)
 233                bpf_msg_pull_data(msg, *start, *end, 0);
 234        start_push = bpf_map_lookup_elem(&sock_bytes, &two);
 235        end_push = bpf_map_lookup_elem(&sock_bytes, &three);
 236        if (start_push && end_push)
 237                bpf_msg_push_data(msg, *start_push, *end_push, 0);
 238        start_pop = bpf_map_lookup_elem(&sock_bytes, &four);
 239        pop = bpf_map_lookup_elem(&sock_bytes, &five);
 240        if (start_pop && pop)
 241                bpf_msg_pop_data(msg, *start_pop, *pop, 0);
 242        return SK_PASS;
 243}
 244
 245SEC("sk_msg2")
 246int bpf_prog6(struct sk_msg_md *msg)
 247{
 248        int zero = 0, one = 1, two = 2, three = 3, four = 4, five = 5, key = 0;
 249        int *bytes, *start, *end, *start_push, *end_push, *start_pop, *pop, *f;
 250        __u64 flags = 0;
 251
 252        bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero);
 253        if (bytes)
 254                bpf_msg_apply_bytes(msg, *bytes);
 255        bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero);
 256        if (bytes)
 257                bpf_msg_cork_bytes(msg, *bytes);
 258
 259        start = bpf_map_lookup_elem(&sock_bytes, &zero);
 260        end = bpf_map_lookup_elem(&sock_bytes, &one);
 261        if (start && end)
 262                bpf_msg_pull_data(msg, *start, *end, 0);
 263
 264        start_push = bpf_map_lookup_elem(&sock_bytes, &two);
 265        end_push = bpf_map_lookup_elem(&sock_bytes, &three);
 266        if (start_push && end_push)
 267                bpf_msg_push_data(msg, *start_push, *end_push, 0);
 268
 269        start_pop = bpf_map_lookup_elem(&sock_bytes, &four);
 270        pop = bpf_map_lookup_elem(&sock_bytes, &five);
 271        if (start_pop && pop)
 272                bpf_msg_pop_data(msg, *start_pop, *pop, 0);
 273
 274        f = bpf_map_lookup_elem(&sock_redir_flags, &zero);
 275        if (f && *f) {
 276                key = 2;
 277                flags = *f;
 278        }
 279#ifdef SOCKMAP
 280        return bpf_msg_redirect_map(msg, &sock_map_redir, key, flags);
 281#else
 282        return bpf_msg_redirect_hash(msg, &sock_map_redir, &key, flags);
 283#endif
 284}
 285
 286SEC("sk_msg3")
 287int bpf_prog8(struct sk_msg_md *msg)
 288{
 289        void *data_end = (void *)(long) msg->data_end;
 290        void *data = (void *)(long) msg->data;
 291        int ret = 0, *bytes, zero = 0;
 292
 293        bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero);
 294        if (bytes) {
 295                ret = bpf_msg_apply_bytes(msg, *bytes);
 296                if (ret)
 297                        return SK_DROP;
 298        } else {
 299                return SK_DROP;
 300        }
 301        return SK_PASS;
 302}
 303SEC("sk_msg4")
 304int bpf_prog9(struct sk_msg_md *msg)
 305{
 306        void *data_end = (void *)(long) msg->data_end;
 307        void *data = (void *)(long) msg->data;
 308        int ret = 0, *bytes, zero = 0;
 309
 310        bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero);
 311        if (bytes) {
 312                if (((__u64)data_end - (__u64)data) >= *bytes)
 313                        return SK_PASS;
 314                ret = bpf_msg_cork_bytes(msg, *bytes);
 315                if (ret)
 316                        return SK_DROP;
 317        }
 318        return SK_PASS;
 319}
 320
 321SEC("sk_msg5")
 322int bpf_prog10(struct sk_msg_md *msg)
 323{
 324        int *bytes, *start, *end, *start_push, *end_push, *start_pop, *pop;
 325        int zero = 0, one = 1, two = 2, three = 3, four = 4, five = 5;
 326
 327        bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero);
 328        if (bytes)
 329                bpf_msg_apply_bytes(msg, *bytes);
 330        bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero);
 331        if (bytes)
 332                bpf_msg_cork_bytes(msg, *bytes);
 333        start = bpf_map_lookup_elem(&sock_bytes, &zero);
 334        end = bpf_map_lookup_elem(&sock_bytes, &one);
 335        if (start && end)
 336                bpf_msg_pull_data(msg, *start, *end, 0);
 337        start_push = bpf_map_lookup_elem(&sock_bytes, &two);
 338        end_push = bpf_map_lookup_elem(&sock_bytes, &three);
 339        if (start_push && end_push)
 340                bpf_msg_push_data(msg, *start_push, *end_push, 0);
 341        start_pop = bpf_map_lookup_elem(&sock_bytes, &four);
 342        pop = bpf_map_lookup_elem(&sock_bytes, &five);
 343        if (start_pop && pop)
 344                bpf_msg_pop_data(msg, *start_pop, *pop, 0);
 345        return SK_DROP;
 346}
 347
 348int _version SEC("version") = 1;
 349char _license[] SEC("license") = "GPL";
 350