1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BPF_CGROUP_H
3 #define _BPF_CGROUP_H
4
5 #include <linux/errno.h>
6 #include <linux/jump_label.h>
7 #include <linux/percpu.h>
8 #include <linux/rbtree.h>
9 #include <uapi/linux/bpf.h>
10
11 struct sock;
12 struct sockaddr;
13 struct cgroup;
14 struct sk_buff;
15 struct bpf_map;
16 struct bpf_prog;
17 struct bpf_sock_ops_kern;
18 struct bpf_cgroup_storage;
19
20 #ifdef CONFIG_CGROUP_BPF
21
22 extern struct static_key_false cgroup_bpf_enabled_key;
23 #define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key)
24
25 DECLARE_PER_CPU(void*, bpf_cgroup_storage);
26
27 struct bpf_cgroup_storage_map;
28
29 struct bpf_storage_buffer {
30 struct rcu_head rcu;
31 char data[0];
32 };
33
34 struct bpf_cgroup_storage {
35 struct bpf_storage_buffer *buf;
36 struct bpf_cgroup_storage_map *map;
37 struct bpf_cgroup_storage_key key;
38 struct list_head list;
39 struct rb_node node;
40 struct rcu_head rcu;
41 };
42
43 struct bpf_prog_list {
44 struct list_head node;
45 struct bpf_prog *prog;
46 struct bpf_cgroup_storage *storage;
47 };
48
49 struct bpf_prog_array;
50
51 struct cgroup_bpf {
52 /* array of effective progs in this cgroup */
53 struct bpf_prog_array __rcu *effective[MAX_BPF_ATTACH_TYPE];
54
55 /* attached progs to this cgroup and attach flags
56 * when flags == 0 or BPF_F_ALLOW_OVERRIDE the progs list will
57 * have either zero or one element
58 * when BPF_F_ALLOW_MULTI the list can have up to BPF_CGROUP_MAX_PROGS
59 */
60 struct list_head progs[MAX_BPF_ATTACH_TYPE];
61 u32 flags[MAX_BPF_ATTACH_TYPE];
62
63 /* temp storage for effective prog array used by prog_attach/detach */
64 struct bpf_prog_array __rcu *inactive;
65 };
66
67 void cgroup_bpf_put(struct cgroup *cgrp);
68 int cgroup_bpf_inherit(struct cgroup *cgrp);
69
70 int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
71 enum bpf_attach_type type, u32 flags);
72 int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
73 enum bpf_attach_type type, u32 flags);
74 int __cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
75 union bpf_attr __user *uattr);
76
77 /* Wrapper for __cgroup_bpf_*() protected by cgroup_mutex */
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, u32 flags);
82 int cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
83 union bpf_attr __user *uattr);
84
85 int __cgroup_bpf_run_filter_skb(struct sock *sk,
86 struct sk_buff *skb,
87 enum bpf_attach_type type);
88
89 int __cgroup_bpf_run_filter_sk(struct sock *sk,
90 enum bpf_attach_type type);
91
92 int __cgroup_bpf_run_filter_sock_addr(struct sock *sk,
93 struct sockaddr *uaddr,
94 enum bpf_attach_type type,
95 void *t_ctx);
96
97 int __cgroup_bpf_run_filter_sock_ops(struct sock *sk,
98 struct bpf_sock_ops_kern *sock_ops,
99 enum bpf_attach_type type);
100
101 int __cgroup_bpf_check_dev_permission(short dev_type, u32 major, u32 minor,
102 short access, enum bpf_attach_type type);
103
bpf_cgroup_storage_set(struct bpf_cgroup_storage * storage)104 static inline void bpf_cgroup_storage_set(struct bpf_cgroup_storage *storage)
105 {
106 struct bpf_storage_buffer *buf;
107
108 if (!storage)
109 return;
110
111 buf = READ_ONCE(storage->buf);
112 this_cpu_write(bpf_cgroup_storage, &buf->data[0]);
113 }
114
115 struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog);
116 void bpf_cgroup_storage_free(struct bpf_cgroup_storage *storage);
117 void bpf_cgroup_storage_link(struct bpf_cgroup_storage *storage,
118 struct cgroup *cgroup,
119 enum bpf_attach_type type);
120 void bpf_cgroup_storage_unlink(struct bpf_cgroup_storage *storage);
121 int bpf_cgroup_storage_assign(struct bpf_prog *prog, struct bpf_map *map);
122 void bpf_cgroup_storage_release(struct bpf_prog *prog, struct bpf_map *map);
123
124 /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
125 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb) \
126 ({ \
127 int __ret = 0; \
128 if (cgroup_bpf_enabled) \
129 __ret = __cgroup_bpf_run_filter_skb(sk, skb, \
130 BPF_CGROUP_INET_INGRESS); \
131 \
132 __ret; \
133 })
134
135 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb) \
136 ({ \
137 int __ret = 0; \
138 if (cgroup_bpf_enabled && sk && sk == skb->sk) { \
139 typeof(sk) __sk = sk_to_full_sk(sk); \
140 if (sk_fullsock(__sk)) \
141 __ret = __cgroup_bpf_run_filter_skb(__sk, skb, \
142 BPF_CGROUP_INET_EGRESS); \
143 } \
144 __ret; \
145 })
146
147 #define BPF_CGROUP_RUN_SK_PROG(sk, type) \
148 ({ \
149 int __ret = 0; \
150 if (cgroup_bpf_enabled) { \
151 __ret = __cgroup_bpf_run_filter_sk(sk, type); \
152 } \
153 __ret; \
154 })
155
156 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) \
157 BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET_SOCK_CREATE)
158
159 #define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk) \
160 BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET4_POST_BIND)
161
162 #define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk) \
163 BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET6_POST_BIND)
164
165 #define BPF_CGROUP_RUN_SA_PROG(sk, uaddr, type) \
166 ({ \
167 int __ret = 0; \
168 if (cgroup_bpf_enabled) \
169 __ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type, \
170 NULL); \
171 __ret; \
172 })
173
174 #define BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, type, t_ctx) \
175 ({ \
176 int __ret = 0; \
177 if (cgroup_bpf_enabled) { \
178 lock_sock(sk); \
179 __ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type, \
180 t_ctx); \
181 release_sock(sk); \
182 } \
183 __ret; \
184 })
185
186 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr) \
187 BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_BIND)
188
189 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr) \
190 BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_BIND)
191
192 #define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (cgroup_bpf_enabled && \
193 sk->sk_prot->pre_connect)
194
195 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr) \
196 BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_CONNECT)
197
198 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr) \
199 BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_CONNECT)
200
201 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr) \
202 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET4_CONNECT, NULL)
203
204 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr) \
205 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET6_CONNECT, NULL)
206
207 #define BPF_CGROUP_RUN_PROG_UDP4_SENDMSG_LOCK(sk, uaddr, t_ctx) \
208 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP4_SENDMSG, t_ctx)
209
210 #define BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, uaddr, t_ctx) \
211 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP6_SENDMSG, t_ctx)
212
213 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) \
214 ({ \
215 int __ret = 0; \
216 if (cgroup_bpf_enabled && (sock_ops)->sk) { \
217 typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk); \
218 if (__sk && sk_fullsock(__sk)) \
219 __ret = __cgroup_bpf_run_filter_sock_ops(__sk, \
220 sock_ops, \
221 BPF_CGROUP_SOCK_OPS); \
222 } \
223 __ret; \
224 })
225
226 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type, major, minor, access) \
227 ({ \
228 int __ret = 0; \
229 if (cgroup_bpf_enabled) \
230 __ret = __cgroup_bpf_check_dev_permission(type, major, minor, \
231 access, \
232 BPF_CGROUP_DEVICE); \
233 \
234 __ret; \
235 })
236 int cgroup_bpf_prog_attach(const union bpf_attr *attr,
237 enum bpf_prog_type ptype, struct bpf_prog *prog);
238 int cgroup_bpf_prog_detach(const union bpf_attr *attr,
239 enum bpf_prog_type ptype);
240 int cgroup_bpf_prog_query(const union bpf_attr *attr,
241 union bpf_attr __user *uattr);
242 #else
243
244 struct bpf_prog;
245 struct cgroup_bpf {};
cgroup_bpf_put(struct cgroup * cgrp)246 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
cgroup_bpf_inherit(struct cgroup * cgrp)247 static inline int cgroup_bpf_inherit(struct cgroup *cgrp) { return 0; }
248
cgroup_bpf_prog_attach(const union bpf_attr * attr,enum bpf_prog_type ptype,struct bpf_prog * prog)249 static inline int cgroup_bpf_prog_attach(const union bpf_attr *attr,
250 enum bpf_prog_type ptype,
251 struct bpf_prog *prog)
252 {
253 return -EINVAL;
254 }
255
cgroup_bpf_prog_detach(const union bpf_attr * attr,enum bpf_prog_type ptype)256 static inline int cgroup_bpf_prog_detach(const union bpf_attr *attr,
257 enum bpf_prog_type ptype)
258 {
259 return -EINVAL;
260 }
261
cgroup_bpf_prog_query(const union bpf_attr * attr,union bpf_attr __user * uattr)262 static inline int cgroup_bpf_prog_query(const union bpf_attr *attr,
263 union bpf_attr __user *uattr)
264 {
265 return -EINVAL;
266 }
267
bpf_cgroup_storage_set(struct bpf_cgroup_storage * storage)268 static inline void bpf_cgroup_storage_set(struct bpf_cgroup_storage *storage) {}
bpf_cgroup_storage_assign(struct bpf_prog * prog,struct bpf_map * map)269 static inline int bpf_cgroup_storage_assign(struct bpf_prog *prog,
270 struct bpf_map *map) { return 0; }
bpf_cgroup_storage_release(struct bpf_prog * prog,struct bpf_map * map)271 static inline void bpf_cgroup_storage_release(struct bpf_prog *prog,
272 struct bpf_map *map) {}
bpf_cgroup_storage_alloc(struct bpf_prog * prog)273 static inline struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(
274 struct bpf_prog *prog) { return 0; }
bpf_cgroup_storage_free(struct bpf_cgroup_storage * storage)275 static inline void bpf_cgroup_storage_free(
276 struct bpf_cgroup_storage *storage) {}
277
278 #define cgroup_bpf_enabled (0)
279 #define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (0)
280 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
281 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
282 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
283 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr) ({ 0; })
284 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr) ({ 0; })
285 #define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk) ({ 0; })
286 #define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk) ({ 0; })
287 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr) ({ 0; })
288 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr) ({ 0; })
289 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr) ({ 0; })
290 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr) ({ 0; })
291 #define BPF_CGROUP_RUN_PROG_UDP4_SENDMSG_LOCK(sk, uaddr, t_ctx) ({ 0; })
292 #define BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, uaddr, t_ctx) ({ 0; })
293 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; })
294 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type,major,minor,access) ({ 0; })
295
296 #endif /* CONFIG_CGROUP_BPF */
297
298 #endif /* _BPF_CGROUP_H */
299
