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 enum bpf_attach_type type, u32 flags); 89 int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog, 90 enum bpf_attach_type type); 91 int __cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr, 92 union bpf_attr __user *uattr); 93 94 /* Wrapper for __cgroup_bpf_*() protected by cgroup_mutex */ 95 int cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog, 96 enum bpf_attach_type type, u32 flags); 97 int cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog, 98 enum bpf_attach_type type, u32 flags); 99 int cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr, 100 union bpf_attr __user *uattr); 101 102 int __cgroup_bpf_run_filter_skb(struct sock *sk, 103 struct sk_buff *skb, 104 enum bpf_attach_type type); 105 106 int __cgroup_bpf_run_filter_sk(struct sock *sk, 107 enum bpf_attach_type type); 108 109 int __cgroup_bpf_run_filter_sock_addr(struct sock *sk, 110 struct sockaddr *uaddr, 111 enum bpf_attach_type type, 112 void *t_ctx); 113 114 int __cgroup_bpf_run_filter_sock_ops(struct sock *sk, 115 struct bpf_sock_ops_kern *sock_ops, 116 enum bpf_attach_type type); 117 118 int __cgroup_bpf_check_dev_permission(short dev_type, u32 major, u32 minor, 119 short access, enum bpf_attach_type type); 120 121 int __cgroup_bpf_run_filter_sysctl(struct ctl_table_header *head, 122 struct ctl_table *table, int write, 123 void __user *buf, size_t *pcount, 124 loff_t *ppos, void **new_buf, 125 enum bpf_attach_type type); 126 127 int __cgroup_bpf_run_filter_setsockopt(struct sock *sock, int *level, 128 int *optname, char __user *optval, 129 int *optlen, char **kernel_optval); 130 int __cgroup_bpf_run_filter_getsockopt(struct sock *sk, int level, 131 int optname, char __user *optval, 132 int __user *optlen, int max_optlen, 133 int retval); 134 135 static inline enum bpf_cgroup_storage_type cgroup_storage_type( 136 struct bpf_map *map) 137 { 138 if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) 139 return BPF_CGROUP_STORAGE_PERCPU; 140 141 return BPF_CGROUP_STORAGE_SHARED; 142 } 143 144 static inline void bpf_cgroup_storage_set(struct bpf_cgroup_storage 145 *storage[MAX_BPF_CGROUP_STORAGE_TYPE]) 146 { 147 enum bpf_cgroup_storage_type stype; 148 149 for_each_cgroup_storage_type(stype) 150 this_cpu_write(bpf_cgroup_storage[stype], storage[stype]); 151 } 152 153 struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog, 154 enum bpf_cgroup_storage_type stype); 155 void bpf_cgroup_storage_free(struct bpf_cgroup_storage *storage); 156 void bpf_cgroup_storage_link(struct bpf_cgroup_storage *storage, 157 struct cgroup *cgroup, 158 enum bpf_attach_type type); 159 void bpf_cgroup_storage_unlink(struct bpf_cgroup_storage *storage); 160 int bpf_cgroup_storage_assign(struct bpf_prog *prog, struct bpf_map *map); 161 void bpf_cgroup_storage_release(struct bpf_prog *prog, struct bpf_map *map); 162 163 int bpf_percpu_cgroup_storage_copy(struct bpf_map *map, void *key, void *value); 164 int bpf_percpu_cgroup_storage_update(struct bpf_map *map, void *key, 165 void *value, u64 flags); 166 167 /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */ 168 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb) \ 169 ({ \ 170 int __ret = 0; \ 171 if (cgroup_bpf_enabled) \ 172 __ret = __cgroup_bpf_run_filter_skb(sk, skb, \ 173 BPF_CGROUP_INET_INGRESS); \ 174 \ 175 __ret; \ 176 }) 177 178 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb) \ 179 ({ \ 180 int __ret = 0; \ 181 if (cgroup_bpf_enabled && sk && sk == skb->sk) { \ 182 typeof(sk) __sk = sk_to_full_sk(sk); \ 183 if (sk_fullsock(__sk)) \ 184 __ret = __cgroup_bpf_run_filter_skb(__sk, skb, \ 185 BPF_CGROUP_INET_EGRESS); \ 186 } \ 187 __ret; \ 188 }) 189 190 #define BPF_CGROUP_RUN_SK_PROG(sk, type) \ 191 ({ \ 192 int __ret = 0; \ 193 if (cgroup_bpf_enabled) { \ 194 __ret = __cgroup_bpf_run_filter_sk(sk, type); \ 195 } \ 196 __ret; \ 197 }) 198 199 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) \ 200 BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET_SOCK_CREATE) 201 202 #define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk) \ 203 BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET4_POST_BIND) 204 205 #define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk) \ 206 BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET6_POST_BIND) 207 208 #define BPF_CGROUP_RUN_SA_PROG(sk, uaddr, type) \ 209 ({ \ 210 int __ret = 0; \ 211 if (cgroup_bpf_enabled) \ 212 __ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type, \ 213 NULL); \ 214 __ret; \ 215 }) 216 217 #define BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, type, t_ctx) \ 218 ({ \ 219 int __ret = 0; \ 220 if (cgroup_bpf_enabled) { \ 221 lock_sock(sk); \ 222 __ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type, \ 223 t_ctx); \ 224 release_sock(sk); \ 225 } \ 226 __ret; \ 227 }) 228 229 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr) \ 230 BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_BIND) 231 232 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr) \ 233 BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_BIND) 234 235 #define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (cgroup_bpf_enabled && \ 236 sk->sk_prot->pre_connect) 237 238 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr) \ 239 BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_CONNECT) 240 241 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr) \ 242 BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_CONNECT) 243 244 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr) \ 245 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET4_CONNECT, NULL) 246 247 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr) \ 248 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET6_CONNECT, NULL) 249 250 #define BPF_CGROUP_RUN_PROG_UDP4_SENDMSG_LOCK(sk, uaddr, t_ctx) \ 251 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP4_SENDMSG, t_ctx) 252 253 #define BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, uaddr, t_ctx) \ 254 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP6_SENDMSG, t_ctx) 255 256 #define BPF_CGROUP_RUN_PROG_UDP4_RECVMSG_LOCK(sk, uaddr) \ 257 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP4_RECVMSG, NULL) 258 259 #define BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, uaddr) \ 260 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP6_RECVMSG, NULL) 261 262 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) \ 263 ({ \ 264 int __ret = 0; \ 265 if (cgroup_bpf_enabled && (sock_ops)->sk) { \ 266 typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk); \ 267 if (__sk && sk_fullsock(__sk)) \ 268 __ret = __cgroup_bpf_run_filter_sock_ops(__sk, \ 269 sock_ops, \ 270 BPF_CGROUP_SOCK_OPS); \ 271 } \ 272 __ret; \ 273 }) 274 275 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type, major, minor, access) \ 276 ({ \ 277 int __ret = 0; \ 278 if (cgroup_bpf_enabled) \ 279 __ret = __cgroup_bpf_check_dev_permission(type, major, minor, \ 280 access, \ 281 BPF_CGROUP_DEVICE); \ 282 \ 283 __ret; \ 284 }) 285 286 287 #define BPF_CGROUP_RUN_PROG_SYSCTL(head, table, write, buf, count, pos, nbuf) \ 288 ({ \ 289 int __ret = 0; \ 290 if (cgroup_bpf_enabled) \ 291 __ret = __cgroup_bpf_run_filter_sysctl(head, table, write, \ 292 buf, count, pos, nbuf, \ 293 BPF_CGROUP_SYSCTL); \ 294 __ret; \ 295 }) 296 297 #define BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock, level, optname, optval, optlen, \ 298 kernel_optval) \ 299 ({ \ 300 int __ret = 0; \ 301 if (cgroup_bpf_enabled) \ 302 __ret = __cgroup_bpf_run_filter_setsockopt(sock, level, \ 303 optname, optval, \ 304 optlen, \ 305 kernel_optval); \ 306 __ret; \ 307 }) 308 309 #define BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen) \ 310 ({ \ 311 int __ret = 0; \ 312 if (cgroup_bpf_enabled) \ 313 get_user(__ret, optlen); \ 314 __ret; \ 315 }) 316 317 #define BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock, level, optname, optval, optlen, \ 318 max_optlen, retval) \ 319 ({ \ 320 int __ret = retval; \ 321 if (cgroup_bpf_enabled) \ 322 __ret = __cgroup_bpf_run_filter_getsockopt(sock, level, \ 323 optname, optval, \ 324 optlen, max_optlen, \ 325 retval); \ 326 __ret; \ 327 }) 328 329 int cgroup_bpf_prog_attach(const union bpf_attr *attr, 330 enum bpf_prog_type ptype, struct bpf_prog *prog); 331 int cgroup_bpf_prog_detach(const union bpf_attr *attr, 332 enum bpf_prog_type ptype); 333 int cgroup_bpf_prog_query(const union bpf_attr *attr, 334 union bpf_attr __user *uattr); 335 #else 336 337 struct bpf_prog; 338 struct cgroup_bpf {}; 339 static inline int cgroup_bpf_inherit(struct cgroup *cgrp) { return 0; } 340 static inline void cgroup_bpf_offline(struct cgroup *cgrp) {} 341 342 static inline int cgroup_bpf_prog_attach(const union bpf_attr *attr, 343 enum bpf_prog_type ptype, 344 struct bpf_prog *prog) 345 { 346 return -EINVAL; 347 } 348 349 static inline int cgroup_bpf_prog_detach(const union bpf_attr *attr, 350 enum bpf_prog_type ptype) 351 { 352 return -EINVAL; 353 } 354 355 static inline int cgroup_bpf_prog_query(const union bpf_attr *attr, 356 union bpf_attr __user *uattr) 357 { 358 return -EINVAL; 359 } 360 361 static inline void bpf_cgroup_storage_set( 362 struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE]) {} 363 static inline int bpf_cgroup_storage_assign(struct bpf_prog *prog, 364 struct bpf_map *map) { return 0; } 365 static inline void bpf_cgroup_storage_release(struct bpf_prog *prog, 366 struct bpf_map *map) {} 367 static inline struct bpf_cgroup_storage *bpf_cgroup_storage_alloc( 368 struct bpf_prog *prog, enum bpf_cgroup_storage_type stype) { return NULL; } 369 static inline void bpf_cgroup_storage_free( 370 struct bpf_cgroup_storage *storage) {} 371 static inline int bpf_percpu_cgroup_storage_copy(struct bpf_map *map, void *key, 372 void *value) { 373 return 0; 374 } 375 static inline int bpf_percpu_cgroup_storage_update(struct bpf_map *map, 376 void *key, void *value, u64 flags) { 377 return 0; 378 } 379 380 #define cgroup_bpf_enabled (0) 381 #define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (0) 382 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; }) 383 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; }) 384 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; }) 385 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr) ({ 0; }) 386 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr) ({ 0; }) 387 #define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk) ({ 0; }) 388 #define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk) ({ 0; }) 389 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr) ({ 0; }) 390 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr) ({ 0; }) 391 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr) ({ 0; }) 392 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr) ({ 0; }) 393 #define BPF_CGROUP_RUN_PROG_UDP4_SENDMSG_LOCK(sk, uaddr, t_ctx) ({ 0; }) 394 #define BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, uaddr, t_ctx) ({ 0; }) 395 #define BPF_CGROUP_RUN_PROG_UDP4_RECVMSG_LOCK(sk, uaddr) ({ 0; }) 396 #define BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, uaddr) ({ 0; }) 397 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; }) 398 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type,major,minor,access) ({ 0; }) 399 #define BPF_CGROUP_RUN_PROG_SYSCTL(head,table,write,buf,count,pos,nbuf) ({ 0; }) 400 #define BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen) ({ 0; }) 401 #define BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock, level, optname, optval, \ 402 optlen, max_optlen, retval) ({ retval; }) 403 #define BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock, level, optname, optval, optlen, \ 404 kernel_optval) ({ 0; }) 405 406 #define for_each_cgroup_storage_type(stype) for (; false; ) 407 408 #endif /* CONFIG_CGROUP_BPF */ 409 410 #endif /* _BPF_CGROUP_H */ 411