include/linux/bpf-cgroup.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BPF_CGROUP_H
   3 #define _BPF_CGROUP_H
   4
   5 #include <linux/bpf.h>
   6 #include <linux/errno.h>
   7 #include <linux/jump_label.h>
   8 #include <linux/percpu.h>
   9 #include <linux/percpu-refcount.h>
  10 #include <linux/rbtree.h>
  11 #include <uapi/linux/bpf.h>
  12
  13 struct sock;
  14 struct sockaddr;
  15 struct cgroup;
  16 struct sk_buff;
  17 struct bpf_map;
  18 struct bpf_prog;
  19 struct bpf_sock_ops_kern;
  20 struct bpf_cgroup_storage;
  21 struct ctl_table;
  22 struct ctl_table_header;
  23
  24 #ifdef CONFIG_CGROUP_BPF
  25
  26 extern struct static_key_false cgroup_bpf_enabled_key;
  27 #define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key)
  28
  29 DECLARE_PER_CPU(struct bpf_cgroup_storage*,
  30                 bpf_cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]);
  31
  32 #define for_each_cgroup_storage_type(stype) \
  33         for (stype = 0; stype < MAX_BPF_CGROUP_STORAGE_TYPE; stype++)
  34
  35 struct bpf_cgroup_storage_map;
  36
  37 struct bpf_storage_buffer {
  38         struct rcu_head rcu;
  39         char data[0];
  40 };
  41
  42 struct bpf_cgroup_storage {
  43         union {
  44                 struct bpf_storage_buffer *buf;
  45                 void __percpu *percpu_buf;
  46         };
  47         struct bpf_cgroup_storage_map *map;
  48         struct bpf_cgroup_storage_key key;
  49         struct list_head list;
  50         struct rb_node node;
  51         struct rcu_head rcu;
  52 };
  53
  54 struct bpf_prog_list {
  55         struct list_head node;
  56         struct bpf_prog *prog;
  57         struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE];
  58 };
  59
  60 struct bpf_prog_array;
  61
  62 struct cgroup_bpf {
  63         /* array of effective progs in this cgroup */
  64         struct bpf_prog_array __rcu *effective[MAX_BPF_ATTACH_TYPE];
  65
  66         /* attached progs to this cgroup and attach flags
  67          * when flags == 0 or BPF_F_ALLOW_OVERRIDE the progs list will
  68          * have either zero or one element
  69          * when BPF_F_ALLOW_MULTI the list can have up to BPF_CGROUP_MAX_PROGS
  70          */
  71         struct list_head progs[MAX_BPF_ATTACH_TYPE];
  72         u32 flags[MAX_BPF_ATTACH_TYPE];
  73
  74         /* temp storage for effective prog array used by prog_attach/detach */
  75         struct bpf_prog_array *inactive;
  76
  77         /* reference counter used to detach bpf programs after cgroup removal */
  78         struct percpu_ref refcnt;
  79
  80         /* cgroup_bpf is released using a work queue */
  81         struct work_struct release_work;
  82 };
  83
  84 int cgroup_bpf_inherit(struct cgroup *cgrp);
  85 void cgroup_bpf_offline(struct cgroup *cgrp);
  86
  87 int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
  88                         struct bpf_prog *replace_prog,
  89                         enum bpf_attach_type type, u32 flags);
  90 int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
  91                         enum bpf_attach_type type);
  92 int __cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
  93                        union bpf_attr __user *uattr);
  94
  95 /* Wrapper for __cgroup_bpf_*() protected by cgroup_mutex */
  96 int cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
  97                       struct bpf_prog *replace_prog, enum bpf_attach_type type,
  98                       u32 flags);
  99 int cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
 100                       enum bpf_attach_type type, u32 flags);
 101 int cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
 102                      union bpf_attr __user *uattr);
 103
 104 int __cgroup_bpf_run_filter_skb(struct sock *sk,
 105                                 struct sk_buff *skb,
 106                                 enum bpf_attach_type type);
 107
 108 int __cgroup_bpf_run_filter_sk(struct sock *sk,
 109                                enum bpf_attach_type type);
 110
 111 int __cgroup_bpf_run_filter_sock_addr(struct sock *sk,
 112                                       struct sockaddr *uaddr,
 113                                       enum bpf_attach_type type,
 114                                       void *t_ctx);
 115
 116 int __cgroup_bpf_run_filter_sock_ops(struct sock *sk,
 117                                      struct bpf_sock_ops_kern *sock_ops,
 118                                      enum bpf_attach_type type);
 119
 120 int __cgroup_bpf_check_dev_permission(short dev_type, u32 major, u32 minor,
 121                                       short access, enum bpf_attach_type type);
 122
 123 int __cgroup_bpf_run_filter_sysctl(struct ctl_table_header *head,
 124                                    struct ctl_table *table, int write,
 125                                    void __user *buf, size_t *pcount,
 126                                    loff_t *ppos, void **new_buf,
 127                                    enum bpf_attach_type type);
 128
 129 int __cgroup_bpf_run_filter_setsockopt(struct sock *sock, int *level,
 130                                        int *optname, char __user *optval,
 131                                        int *optlen, char **kernel_optval);
 132 int __cgroup_bpf_run_filter_getsockopt(struct sock *sk, int level,
 133                                        int optname, char __user *optval,
 134                                        int __user *optlen, int max_optlen,
 135                                        int retval);
 136
 137 static inline enum bpf_cgroup_storage_type cgroup_storage_type(
 138         struct bpf_map *map)
 139 {
 140         if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
 141                 return BPF_CGROUP_STORAGE_PERCPU;
 142
 143         return BPF_CGROUP_STORAGE_SHARED;
 144 }
 145
 146 static inline void bpf_cgroup_storage_set(struct bpf_cgroup_storage
 147                                           *storage[MAX_BPF_CGROUP_STORAGE_TYPE])
 148 {
 149         enum bpf_cgroup_storage_type stype;
 150
 151         for_each_cgroup_storage_type(stype)
 152                 this_cpu_write(bpf_cgroup_storage[stype], storage[stype]);
 153 }
 154
 155 struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog,
 156                                         enum bpf_cgroup_storage_type stype);
 157 void bpf_cgroup_storage_free(struct bpf_cgroup_storage *storage);
 158 void bpf_cgroup_storage_link(struct bpf_cgroup_storage *storage,
 159                              struct cgroup *cgroup,
 160                              enum bpf_attach_type type);
 161 void bpf_cgroup_storage_unlink(struct bpf_cgroup_storage *storage);
 162 int bpf_cgroup_storage_assign(struct bpf_prog_aux *aux, struct bpf_map *map);
 163 void bpf_cgroup_storage_release(struct bpf_prog_aux *aux, struct bpf_map *map);
 164
 165 int bpf_percpu_cgroup_storage_copy(struct bpf_map *map, void *key, void *value);
 166 int bpf_percpu_cgroup_storage_update(struct bpf_map *map, void *key,
 167                                      void *value, u64 flags);
 168
 169 /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
 170 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb)                             \
 171 ({                                                                            \
 172         int __ret = 0;                                                        \
 173         if (cgroup_bpf_enabled)                                               \
 174                 __ret = __cgroup_bpf_run_filter_skb(sk, skb,                  \
 175                                                     BPF_CGROUP_INET_INGRESS); \
 176                                                                               \
 177         __ret;                                                                \
 178 })
 179
 180 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb)                               \
 181 ({                                                                             \
 182         int __ret = 0;                                                         \
 183         if (cgroup_bpf_enabled && sk && sk == skb->sk) {                       \
 184                 typeof(sk) __sk = sk_to_full_sk(sk);                           \
 185                 if (sk_fullsock(__sk))                                         \
 186                         __ret = __cgroup_bpf_run_filter_skb(__sk, skb,         \
 187                                                       BPF_CGROUP_INET_EGRESS); \
 188         }                                                                      \
 189         __ret;                                                                 \
 190 })
 191
 192 #define BPF_CGROUP_RUN_SK_PROG(sk, type)                                       \
 193 ({                                                                             \
 194         int __ret = 0;                                                         \
 195         if (cgroup_bpf_enabled) {                                              \
 196                 __ret = __cgroup_bpf_run_filter_sk(sk, type);                  \
 197         }                                                                      \
 198         __ret;                                                                 \
 199 })
 200
 201 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk)                                      \
 202         BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET_SOCK_CREATE)
 203
 204 #define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk)                                \
 205         BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET4_POST_BIND)
 206
 207 #define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk)                                \
 208         BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET6_POST_BIND)
 209
 210 #define BPF_CGROUP_RUN_SA_PROG(sk, uaddr, type)                                \
 211 ({                                                                             \
 212         int __ret = 0;                                                         \
 213         if (cgroup_bpf_enabled)                                                \
 214                 __ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type,     \
 215                                                           NULL);               \
 216         __ret;                                                                 \
 217 })
 218
 219 #define BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, type, t_ctx)                    \
 220 ({                                                                             \
 221         int __ret = 0;                                                         \
 222         if (cgroup_bpf_enabled) {                                              \
 223                 lock_sock(sk);                                                 \
 224                 __ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type,     \
 225                                                           t_ctx);              \
 226                 release_sock(sk);                                              \
 227         }                                                                      \
 228         __ret;                                                                 \
 229 })
 230
 231 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr)                              \
 232         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_BIND)
 233
 234 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr)                              \
 235         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_BIND)
 236
 237 #define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (cgroup_bpf_enabled && \
 238                                             sk->sk_prot->pre_connect)
 239
 240 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr)                           \
 241         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_CONNECT)
 242
 243 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr)                           \
 244         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_CONNECT)
 245
 246 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr)                      \
 247         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET4_CONNECT, NULL)
 248
 249 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr)                      \
 250         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET6_CONNECT, NULL)
 251
 252 #define BPF_CGROUP_RUN_PROG_UDP4_SENDMSG_LOCK(sk, uaddr, t_ctx)                \
 253         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP4_SENDMSG, t_ctx)
 254
 255 #define BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, uaddr, t_ctx)                \
 256         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP6_SENDMSG, t_ctx)
 257
 258 #define BPF_CGROUP_RUN_PROG_UDP4_RECVMSG_LOCK(sk, uaddr)                        \
 259         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP4_RECVMSG, NULL)
 260
 261 #define BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, uaddr)                        \
 262         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP6_RECVMSG, NULL)
 263
 264 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops)                                 \
 265 ({                                                                             \
 266         int __ret = 0;                                                         \
 267         if (cgroup_bpf_enabled && (sock_ops)->sk) {            \
 268                 typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk);               \
 269                 if (__sk && sk_fullsock(__sk))                                 \
 270                         __ret = __cgroup_bpf_run_filter_sock_ops(__sk,         \
 271                                                                  sock_ops,     \
 272                                                          BPF_CGROUP_SOCK_OPS); \
 273         }                                                                      \
 274         __ret;                                                                 \
 275 })
 276
 277 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type, major, minor, access)         \
 278 ({                                                                            \
 279         int __ret = 0;                                                        \
 280         if (cgroup_bpf_enabled)                                               \
 281                 __ret = __cgroup_bpf_check_dev_permission(type, major, minor, \
 282                                                           access,             \
 283                                                           BPF_CGROUP_DEVICE); \
 284                                                                               \
 285         __ret;                                                                \
 286 })
 287
 288
 289 #define BPF_CGROUP_RUN_PROG_SYSCTL(head, table, write, buf, count, pos, nbuf)  \
 290 ({                                                                             \
 291         int __ret = 0;                                                         \
 292         if (cgroup_bpf_enabled)                                                \
 293                 __ret = __cgroup_bpf_run_filter_sysctl(head, table, write,     \
 294                                                        buf, count, pos, nbuf,  \
 295                                                        BPF_CGROUP_SYSCTL);     \
 296         __ret;                                                                 \
 297 })
 298
 299 #define BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock, level, optname, optval, optlen,   \
 300                                        kernel_optval)                          \
 301 ({                                                                             \
 302         int __ret = 0;                                                         \
 303         if (cgroup_bpf_enabled)                                                \
 304                 __ret = __cgroup_bpf_run_filter_setsockopt(sock, level,        \
 305                                                            optname, optval,    \
 306                                                            optlen,             \
 307                                                            kernel_optval);     \
 308         __ret;                                                                 \
 309 })
 310
 311 #define BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen)                               \
 312 ({                                                                             \
 313         int __ret = 0;                                                         \
 314         if (cgroup_bpf_enabled)                                                \
 315                 get_user(__ret, optlen);                                       \
 316         __ret;                                                                 \
 317 })
 318
 319 #define BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock, level, optname, optval, optlen,   \
 320                                        max_optlen, retval)                     \
 321 ({                                                                             \
 322         int __ret = retval;                                                    \
 323         if (cgroup_bpf_enabled)                                                \
 324                 __ret = __cgroup_bpf_run_filter_getsockopt(sock, level,        \
 325                                                            optname, optval,    \
 326                                                            optlen, max_optlen, \
 327                                                            retval);            \
 328         __ret;                                                                 \
 329 })
 330
 331 int cgroup_bpf_prog_attach(const union bpf_attr *attr,
 332                            enum bpf_prog_type ptype, struct bpf_prog *prog);
 333 int cgroup_bpf_prog_detach(const union bpf_attr *attr,
 334                            enum bpf_prog_type ptype);
 335 int cgroup_bpf_prog_query(const union bpf_attr *attr,
 336                           union bpf_attr __user *uattr);
 337 #else
 338
 339 struct bpf_prog;
 340 struct cgroup_bpf {};
 341 static inline int cgroup_bpf_inherit(struct cgroup *cgrp) { return 0; }
 342 static inline void cgroup_bpf_offline(struct cgroup *cgrp) {}
 343
 344 static inline int cgroup_bpf_prog_attach(const union bpf_attr *attr,
 345                                          enum bpf_prog_type ptype,
 346                                          struct bpf_prog *prog)
 347 {
 348         return -EINVAL;
 349 }
 350
 351 static inline int cgroup_bpf_prog_detach(const union bpf_attr *attr,
 352                                          enum bpf_prog_type ptype)
 353 {
 354         return -EINVAL;
 355 }
 356
 357 static inline int cgroup_bpf_prog_query(const union bpf_attr *attr,
 358                                         union bpf_attr __user *uattr)
 359 {
 360         return -EINVAL;
 361 }
 362
 363 static inline void bpf_cgroup_storage_set(
 364         struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE]) {}
 365 static inline int bpf_cgroup_storage_assign(struct bpf_prog_aux *aux,
 366                                             struct bpf_map *map) { return 0; }
 367 static inline void bpf_cgroup_storage_release(struct bpf_prog_aux *aux,
 368                                               struct bpf_map *map) {}
 369 static inline struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(
 370         struct bpf_prog *prog, enum bpf_cgroup_storage_type stype) { return NULL; }
 371 static inline void bpf_cgroup_storage_free(
 372         struct bpf_cgroup_storage *storage) {}
 373 static inline int bpf_percpu_cgroup_storage_copy(struct bpf_map *map, void *key,
 374                                                  void *value) {
 375         return 0;
 376 }
 377 static inline int bpf_percpu_cgroup_storage_update(struct bpf_map *map,
 378                                         void *key, void *value, u64 flags) {
 379         return 0;
 380 }
 381
 382 #define cgroup_bpf_enabled (0)
 383 #define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (0)
 384 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
 385 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
 386 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
 387 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr) ({ 0; })
 388 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr) ({ 0; })
 389 #define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk) ({ 0; })
 390 #define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk) ({ 0; })
 391 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr) ({ 0; })
 392 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr) ({ 0; })
 393 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr) ({ 0; })
 394 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr) ({ 0; })
 395 #define BPF_CGROUP_RUN_PROG_UDP4_SENDMSG_LOCK(sk, uaddr, t_ctx) ({ 0; })
 396 #define BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, uaddr, t_ctx) ({ 0; })
 397 #define BPF_CGROUP_RUN_PROG_UDP4_RECVMSG_LOCK(sk, uaddr) ({ 0; })
 398 #define BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, uaddr) ({ 0; })
 399 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; })
 400 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type,major,minor,access) ({ 0; })
 401 #define BPF_CGROUP_RUN_PROG_SYSCTL(head,table,write,buf,count,pos,nbuf) ({ 0; })
 402 #define BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen) ({ 0; })
 403 #define BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock, level, optname, optval, \
 404                                        optlen, max_optlen, retval) ({ retval; })
 405 #define BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock, level, optname, optval, optlen, \
 406                                        kernel_optval) ({ 0; })
 407
 408 #define for_each_cgroup_storage_type(stype) for (; false; )
 409
 410 #endif /* CONFIG_CGROUP_BPF */
 411
 412 #endif /* _BPF_CGROUP_H */