bpf: Post-hooks for sys_bind
[muen/linux.git] / 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/jump_label.h>
6 #include <uapi/linux/bpf.h>
7
8 struct sock;
9 struct sockaddr;
10 struct cgroup;
11 struct sk_buff;
12 struct bpf_sock_ops_kern;
13
14 #ifdef CONFIG_CGROUP_BPF
15
16 extern struct static_key_false cgroup_bpf_enabled_key;
17 #define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key)
18
19 struct bpf_prog_list {
20         struct list_head node;
21         struct bpf_prog *prog;
22 };
23
24 struct bpf_prog_array;
25
26 struct cgroup_bpf {
27         /* array of effective progs in this cgroup */
28         struct bpf_prog_array __rcu *effective[MAX_BPF_ATTACH_TYPE];
29
30         /* attached progs to this cgroup and attach flags
31          * when flags == 0 or BPF_F_ALLOW_OVERRIDE the progs list will
32          * have either zero or one element
33          * when BPF_F_ALLOW_MULTI the list can have up to BPF_CGROUP_MAX_PROGS
34          */
35         struct list_head progs[MAX_BPF_ATTACH_TYPE];
36         u32 flags[MAX_BPF_ATTACH_TYPE];
37
38         /* temp storage for effective prog array used by prog_attach/detach */
39         struct bpf_prog_array __rcu *inactive;
40 };
41
42 void cgroup_bpf_put(struct cgroup *cgrp);
43 int cgroup_bpf_inherit(struct cgroup *cgrp);
44
45 int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
46                         enum bpf_attach_type type, u32 flags);
47 int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
48                         enum bpf_attach_type type, u32 flags);
49 int __cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
50                        union bpf_attr __user *uattr);
51
52 /* Wrapper for __cgroup_bpf_*() protected by cgroup_mutex */
53 int cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
54                       enum bpf_attach_type type, u32 flags);
55 int cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
56                       enum bpf_attach_type type, u32 flags);
57 int cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
58                      union bpf_attr __user *uattr);
59
60 int __cgroup_bpf_run_filter_skb(struct sock *sk,
61                                 struct sk_buff *skb,
62                                 enum bpf_attach_type type);
63
64 int __cgroup_bpf_run_filter_sk(struct sock *sk,
65                                enum bpf_attach_type type);
66
67 int __cgroup_bpf_run_filter_sock_addr(struct sock *sk,
68                                       struct sockaddr *uaddr,
69                                       enum bpf_attach_type type);
70
71 int __cgroup_bpf_run_filter_sock_ops(struct sock *sk,
72                                      struct bpf_sock_ops_kern *sock_ops,
73                                      enum bpf_attach_type type);
74
75 int __cgroup_bpf_check_dev_permission(short dev_type, u32 major, u32 minor,
76                                       short access, enum bpf_attach_type type);
77
78 /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
79 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb)                             \
80 ({                                                                            \
81         int __ret = 0;                                                        \
82         if (cgroup_bpf_enabled)                                               \
83                 __ret = __cgroup_bpf_run_filter_skb(sk, skb,                  \
84                                                     BPF_CGROUP_INET_INGRESS); \
85                                                                               \
86         __ret;                                                                \
87 })
88
89 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb)                               \
90 ({                                                                             \
91         int __ret = 0;                                                         \
92         if (cgroup_bpf_enabled && sk && sk == skb->sk) {                       \
93                 typeof(sk) __sk = sk_to_full_sk(sk);                           \
94                 if (sk_fullsock(__sk))                                         \
95                         __ret = __cgroup_bpf_run_filter_skb(__sk, skb,         \
96                                                       BPF_CGROUP_INET_EGRESS); \
97         }                                                                      \
98         __ret;                                                                 \
99 })
100
101 #define BPF_CGROUP_RUN_SK_PROG(sk, type)                                       \
102 ({                                                                             \
103         int __ret = 0;                                                         \
104         if (cgroup_bpf_enabled) {                                              \
105                 __ret = __cgroup_bpf_run_filter_sk(sk, type);                  \
106         }                                                                      \
107         __ret;                                                                 \
108 })
109
110 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk)                                      \
111         BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET_SOCK_CREATE)
112
113 #define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk)                                \
114         BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET4_POST_BIND)
115
116 #define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk)                                \
117         BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET6_POST_BIND)
118
119 #define BPF_CGROUP_RUN_SA_PROG(sk, uaddr, type)                                \
120 ({                                                                             \
121         int __ret = 0;                                                         \
122         if (cgroup_bpf_enabled)                                                \
123                 __ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type);    \
124         __ret;                                                                 \
125 })
126
127 #define BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, type)                           \
128 ({                                                                             \
129         int __ret = 0;                                                         \
130         if (cgroup_bpf_enabled) {                                              \
131                 lock_sock(sk);                                                 \
132                 __ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type);    \
133                 release_sock(sk);                                              \
134         }                                                                      \
135         __ret;                                                                 \
136 })
137
138 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr)                              \
139         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_BIND)
140
141 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr)                              \
142         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_BIND)
143
144 #define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (cgroup_bpf_enabled && \
145                                             sk->sk_prot->pre_connect)
146
147 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr)                           \
148         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_CONNECT)
149
150 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr)                           \
151         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_CONNECT)
152
153 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr)                      \
154         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET4_CONNECT)
155
156 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr)                      \
157         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET6_CONNECT)
158
159 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops)                                 \
160 ({                                                                             \
161         int __ret = 0;                                                         \
162         if (cgroup_bpf_enabled && (sock_ops)->sk) {            \
163                 typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk);               \
164                 if (__sk && sk_fullsock(__sk))                                 \
165                         __ret = __cgroup_bpf_run_filter_sock_ops(__sk,         \
166                                                                  sock_ops,     \
167                                                          BPF_CGROUP_SOCK_OPS); \
168         }                                                                      \
169         __ret;                                                                 \
170 })
171
172 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type, major, minor, access)         \
173 ({                                                                            \
174         int __ret = 0;                                                        \
175         if (cgroup_bpf_enabled)                                               \
176                 __ret = __cgroup_bpf_check_dev_permission(type, major, minor, \
177                                                           access,             \
178                                                           BPF_CGROUP_DEVICE); \
179                                                                               \
180         __ret;                                                                \
181 })
182 #else
183
184 struct cgroup_bpf {};
185 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
186 static inline int cgroup_bpf_inherit(struct cgroup *cgrp) { return 0; }
187
188 #define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (0)
189 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
190 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
191 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
192 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr) ({ 0; })
193 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr) ({ 0; })
194 #define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk) ({ 0; })
195 #define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk) ({ 0; })
196 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr) ({ 0; })
197 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr) ({ 0; })
198 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr) ({ 0; })
199 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr) ({ 0; })
200 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; })
201 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type,major,minor,access) ({ 0; })
202
203 #endif /* CONFIG_CGROUP_BPF */
204
205 #endif /* _BPF_CGROUP_H */