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/rbtree.h>
  10 #include <uapi/linux/bpf.h>
  11
  12 struct sock;
  13 struct sockaddr;
  14 struct cgroup;
  15 struct sk_buff;
  16 struct bpf_map;
  17 struct bpf_prog;
  18 struct bpf_sock_ops_kern;
  19 struct bpf_cgroup_storage;
  20
  21 #ifdef CONFIG_CGROUP_BPF
  22
  23 extern struct static_key_false cgroup_bpf_enabled_key;
  24 #define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key)
  25
  26 DECLARE_PER_CPU(struct bpf_cgroup_storage*,
  27                 bpf_cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]);
  28
  29 #define for_each_cgroup_storage_type(stype) \
  30         for (stype = 0; stype < MAX_BPF_CGROUP_STORAGE_TYPE; stype++)
  31
  32 struct bpf_cgroup_storage_map;
  33
  34 struct bpf_storage_buffer {
  35         struct rcu_head rcu;
  36         char data[0];
  37 };
  38
  39 struct bpf_cgroup_storage {
  40         union {
  41                 struct bpf_storage_buffer *buf;
  42                 void __percpu *percpu_buf;
  43         };
  44         struct bpf_cgroup_storage_map *map;
  45         struct bpf_cgroup_storage_key key;
  46         struct list_head list;
  47         struct rb_node node;
  48         struct rcu_head rcu;
  49 };
  50
  51 struct bpf_prog_list {
  52         struct list_head node;
  53         struct bpf_prog *prog;
  54         struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE];
  55 };
  56
  57 struct bpf_prog_array;
  58
  59 struct cgroup_bpf {
  60         /* array of effective progs in this cgroup */
  61         struct bpf_prog_array __rcu *effective[MAX_BPF_ATTACH_TYPE];
  62
  63         /* attached progs to this cgroup and attach flags
  64          * when flags == 0 or BPF_F_ALLOW_OVERRIDE the progs list will
  65          * have either zero or one element
  66          * when BPF_F_ALLOW_MULTI the list can have up to BPF_CGROUP_MAX_PROGS
  67          */
  68         struct list_head progs[MAX_BPF_ATTACH_TYPE];
  69         u32 flags[MAX_BPF_ATTACH_TYPE];
  70
  71         /* temp storage for effective prog array used by prog_attach/detach */
  72         struct bpf_prog_array __rcu *inactive;
  73 };
  74
  75 void cgroup_bpf_put(struct cgroup *cgrp);
  76 int cgroup_bpf_inherit(struct cgroup *cgrp);
  77
  78 int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
  79                         enum bpf_attach_type type, u32 flags);
  80 int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
  81                         enum bpf_attach_type type);
  82 int __cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
  83                        union bpf_attr __user *uattr);
  84
  85 /* Wrapper for __cgroup_bpf_*() protected by cgroup_mutex */
  86 int cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
  87                       enum bpf_attach_type type, u32 flags);
  88 int cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
  89                       enum bpf_attach_type type, u32 flags);
  90 int cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
  91                      union bpf_attr __user *uattr);
  92
  93 int __cgroup_bpf_run_filter_skb(struct sock *sk,
  94                                 struct sk_buff *skb,
  95                                 enum bpf_attach_type type);
  96
  97 int __cgroup_bpf_run_filter_sk(struct sock *sk,
  98                                enum bpf_attach_type type);
  99
 100 int __cgroup_bpf_run_filter_sock_addr(struct sock *sk,
 101                                       struct sockaddr *uaddr,
 102                                       enum bpf_attach_type type,
 103                                       void *t_ctx);
 104
 105 int __cgroup_bpf_run_filter_sock_ops(struct sock *sk,
 106                                      struct bpf_sock_ops_kern *sock_ops,
 107                                      enum bpf_attach_type type);
 108
 109 int __cgroup_bpf_check_dev_permission(short dev_type, u32 major, u32 minor,
 110                                       short access, enum bpf_attach_type type);
 111
 112 static inline enum bpf_cgroup_storage_type cgroup_storage_type(
 113         struct bpf_map *map)
 114 {
 115         if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
 116                 return BPF_CGROUP_STORAGE_PERCPU;
 117
 118         return BPF_CGROUP_STORAGE_SHARED;
 119 }
 120
 121 static inline void bpf_cgroup_storage_set(struct bpf_cgroup_storage
 122                                           *storage[MAX_BPF_CGROUP_STORAGE_TYPE])
 123 {
 124         enum bpf_cgroup_storage_type stype;
 125
 126         for_each_cgroup_storage_type(stype)
 127                 this_cpu_write(bpf_cgroup_storage[stype], storage[stype]);
 128 }
 129
 130 struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog,
 131                                         enum bpf_cgroup_storage_type stype);
 132 void bpf_cgroup_storage_free(struct bpf_cgroup_storage *storage);
 133 void bpf_cgroup_storage_link(struct bpf_cgroup_storage *storage,
 134                              struct cgroup *cgroup,
 135                              enum bpf_attach_type type);
 136 void bpf_cgroup_storage_unlink(struct bpf_cgroup_storage *storage);
 137 int bpf_cgroup_storage_assign(struct bpf_prog *prog, struct bpf_map *map);
 138 void bpf_cgroup_storage_release(struct bpf_prog *prog, struct bpf_map *map);
 139
 140 int bpf_percpu_cgroup_storage_copy(struct bpf_map *map, void *key, void *value);
 141 int bpf_percpu_cgroup_storage_update(struct bpf_map *map, void *key,
 142                                      void *value, u64 flags);
 143
 144 /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
 145 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb)                             \
 146 ({                                                                            \
 147         int __ret = 0;                                                        \
 148         if (cgroup_bpf_enabled)                                               \
 149                 __ret = __cgroup_bpf_run_filter_skb(sk, skb,                  \
 150                                                     BPF_CGROUP_INET_INGRESS); \
 151                                                                               \
 152         __ret;                                                                \
 153 })
 154
 155 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb)                               \
 156 ({                                                                             \
 157         int __ret = 0;                                                         \
 158         if (cgroup_bpf_enabled && sk && sk == skb->sk) {                       \
 159                 typeof(sk) __sk = sk_to_full_sk(sk);                           \
 160                 if (sk_fullsock(__sk))                                         \
 161                         __ret = __cgroup_bpf_run_filter_skb(__sk, skb,         \
 162                                                       BPF_CGROUP_INET_EGRESS); \
 163         }                                                                      \
 164         __ret;                                                                 \
 165 })
 166
 167 #define BPF_CGROUP_RUN_SK_PROG(sk, type)                                       \
 168 ({                                                                             \
 169         int __ret = 0;                                                         \
 170         if (cgroup_bpf_enabled) {                                              \
 171                 __ret = __cgroup_bpf_run_filter_sk(sk, type);                  \
 172         }                                                                      \
 173         __ret;                                                                 \
 174 })
 175
 176 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk)                                      \
 177         BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET_SOCK_CREATE)
 178
 179 #define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk)                                \
 180         BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET4_POST_BIND)
 181
 182 #define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk)                                \
 183         BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET6_POST_BIND)
 184
 185 #define BPF_CGROUP_RUN_SA_PROG(sk, uaddr, type)                                \
 186 ({                                                                             \
 187         int __ret = 0;                                                         \
 188         if (cgroup_bpf_enabled)                                                \
 189                 __ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type,     \
 190                                                           NULL);               \
 191         __ret;                                                                 \
 192 })
 193
 194 #define BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, type, t_ctx)                    \
 195 ({                                                                             \
 196         int __ret = 0;                                                         \
 197         if (cgroup_bpf_enabled) {                                              \
 198                 lock_sock(sk);                                                 \
 199                 __ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type,     \
 200                                                           t_ctx);              \
 201                 release_sock(sk);                                              \
 202         }                                                                      \
 203         __ret;                                                                 \
 204 })
 205
 206 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr)                              \
 207         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_BIND)
 208
 209 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr)                              \
 210         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_BIND)
 211
 212 #define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (cgroup_bpf_enabled && \
 213                                             sk->sk_prot->pre_connect)
 214
 215 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr)                           \
 216         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_CONNECT)
 217
 218 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr)                           \
 219         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_CONNECT)
 220
 221 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr)                      \
 222         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET4_CONNECT, NULL)
 223
 224 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr)                      \
 225         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET6_CONNECT, NULL)
 226
 227 #define BPF_CGROUP_RUN_PROG_UDP4_SENDMSG_LOCK(sk, uaddr, t_ctx)                \
 228         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP4_SENDMSG, t_ctx)
 229
 230 #define BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, uaddr, t_ctx)                \
 231         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP6_SENDMSG, t_ctx)
 232
 233 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops)                                 \
 234 ({                                                                             \
 235         int __ret = 0;                                                         \
 236         if (cgroup_bpf_enabled && (sock_ops)->sk) {            \
 237                 typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk);               \
 238                 if (__sk && sk_fullsock(__sk))                                 \
 239                         __ret = __cgroup_bpf_run_filter_sock_ops(__sk,         \
 240                                                                  sock_ops,     \
 241                                                          BPF_CGROUP_SOCK_OPS); \
 242         }                                                                      \
 243         __ret;                                                                 \
 244 })
 245
 246 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type, major, minor, access)         \
 247 ({                                                                            \
 248         int __ret = 0;                                                        \
 249         if (cgroup_bpf_enabled)                                               \
 250                 __ret = __cgroup_bpf_check_dev_permission(type, major, minor, \
 251                                                           access,             \
 252                                                           BPF_CGROUP_DEVICE); \
 253                                                                               \
 254         __ret;                                                                \
 255 })
 256 int cgroup_bpf_prog_attach(const union bpf_attr *attr,
 257                            enum bpf_prog_type ptype, struct bpf_prog *prog);
 258 int cgroup_bpf_prog_detach(const union bpf_attr *attr,
 259                            enum bpf_prog_type ptype);
 260 int cgroup_bpf_prog_query(const union bpf_attr *attr,
 261                           union bpf_attr __user *uattr);
 262 #else
 263
 264 struct bpf_prog;
 265 struct cgroup_bpf {};
 266 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
 267 static inline int cgroup_bpf_inherit(struct cgroup *cgrp) { return 0; }
 268
 269 static inline int cgroup_bpf_prog_attach(const union bpf_attr *attr,
 270                                          enum bpf_prog_type ptype,
 271                                          struct bpf_prog *prog)
 272 {
 273         return -EINVAL;
 274 }
 275
 276 static inline int cgroup_bpf_prog_detach(const union bpf_attr *attr,
 277                                          enum bpf_prog_type ptype)
 278 {
 279         return -EINVAL;
 280 }
 281
 282 static inline int cgroup_bpf_prog_query(const union bpf_attr *attr,
 283                                         union bpf_attr __user *uattr)
 284 {
 285         return -EINVAL;
 286 }
 287
 288 static inline void bpf_cgroup_storage_set(
 289         struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE]) {}
 290 static inline int bpf_cgroup_storage_assign(struct bpf_prog *prog,
 291                                             struct bpf_map *map) { return 0; }
 292 static inline void bpf_cgroup_storage_release(struct bpf_prog *prog,
 293                                               struct bpf_map *map) {}
 294 static inline struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(
 295         struct bpf_prog *prog, enum bpf_cgroup_storage_type stype) { return 0; }
 296 static inline void bpf_cgroup_storage_free(
 297         struct bpf_cgroup_storage *storage) {}
 298 static inline int bpf_percpu_cgroup_storage_copy(struct bpf_map *map, void *key,
 299                                                  void *value) {
 300         return 0;
 301 }
 302 static inline int bpf_percpu_cgroup_storage_update(struct bpf_map *map,
 303                                         void *key, void *value, u64 flags) {
 304         return 0;
 305 }
 306
 307 #define cgroup_bpf_enabled (0)
 308 #define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (0)
 309 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
 310 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
 311 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
 312 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr) ({ 0; })
 313 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr) ({ 0; })
 314 #define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk) ({ 0; })
 315 #define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk) ({ 0; })
 316 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr) ({ 0; })
 317 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr) ({ 0; })
 318 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr) ({ 0; })
 319 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr) ({ 0; })
 320 #define BPF_CGROUP_RUN_PROG_UDP4_SENDMSG_LOCK(sk, uaddr, t_ctx) ({ 0; })
 321 #define BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, uaddr, t_ctx) ({ 0; })
 322 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; })
 323 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type,major,minor,access) ({ 0; })
 324
 325 #define for_each_cgroup_storage_type(stype) for (; false; )
 326
 327 #endif /* CONFIG_CGROUP_BPF */
 328
 329 #endif /* _BPF_CGROUP_H */