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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 cgroup; | |
10 | struct sk_buff; | |
11 | struct bpf_sock_ops_kern; | |
12 | ||
13 | #ifdef CONFIG_CGROUP_BPF | |
14 | ||
15 | extern struct static_key_false cgroup_bpf_enabled_key; | |
16 | #define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key) | |
17 | ||
18 | struct bpf_prog_list { | |
19 | struct list_head node; | |
20 | struct bpf_prog *prog; | |
21 | }; | |
22 | ||
23 | struct bpf_prog_array; | |
24 | ||
25 | struct cgroup_bpf { | |
26 | /* array of effective progs in this cgroup */ | |
27 | struct bpf_prog_array __rcu *effective[MAX_BPF_ATTACH_TYPE]; | |
28 | ||
29 | /* attached progs to this cgroup and attach flags | |
30 | * when flags == 0 or BPF_F_ALLOW_OVERRIDE the progs list will | |
31 | * have either zero or one element | |
32 | * when BPF_F_ALLOW_MULTI the list can have up to BPF_CGROUP_MAX_PROGS | |
33 | */ | |
34 | struct list_head progs[MAX_BPF_ATTACH_TYPE]; | |
35 | u32 flags[MAX_BPF_ATTACH_TYPE]; | |
36 | ||
37 | /* temp storage for effective prog array used by prog_attach/detach */ | |
38 | struct bpf_prog_array __rcu *inactive; | |
39 | }; | |
40 | ||
41 | void cgroup_bpf_put(struct cgroup *cgrp); | |
42 | int cgroup_bpf_inherit(struct cgroup *cgrp); | |
43 | ||
44 | int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog, | |
45 | enum bpf_attach_type type, u32 flags); | |
46 | int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog, | |
47 | enum bpf_attach_type type, u32 flags); | |
48 | int __cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr, | |
49 | union bpf_attr __user *uattr); | |
50 | ||
51 | /* Wrapper for __cgroup_bpf_*() protected by cgroup_mutex */ | |
52 | int cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog, | |
53 | enum bpf_attach_type type, u32 flags); | |
54 | int cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog, | |
55 | enum bpf_attach_type type, u32 flags); | |
56 | int cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr, | |
57 | union bpf_attr __user *uattr); | |
58 | ||
59 | int __cgroup_bpf_run_filter_skb(struct sock *sk, | |
60 | struct sk_buff *skb, | |
61 | enum bpf_attach_type type); | |
62 | ||
63 | int __cgroup_bpf_run_filter_sk(struct sock *sk, | |
64 | enum bpf_attach_type type); | |
65 | ||
66 | int __cgroup_bpf_run_filter_sock_ops(struct sock *sk, | |
67 | struct bpf_sock_ops_kern *sock_ops, | |
68 | enum bpf_attach_type type); | |
69 | ||
70 | int __cgroup_bpf_check_dev_permission(short dev_type, u32 major, u32 minor, | |
71 | short access, enum bpf_attach_type type); | |
72 | ||
73 | /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */ | |
74 | #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb) \ | |
75 | ({ \ | |
76 | int __ret = 0; \ | |
77 | if (cgroup_bpf_enabled) \ | |
78 | __ret = __cgroup_bpf_run_filter_skb(sk, skb, \ | |
79 | BPF_CGROUP_INET_INGRESS); \ | |
80 | \ | |
81 | __ret; \ | |
82 | }) | |
83 | ||
84 | #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb) \ | |
85 | ({ \ | |
86 | int __ret = 0; \ | |
87 | if (cgroup_bpf_enabled && sk && sk == skb->sk) { \ | |
88 | typeof(sk) __sk = sk_to_full_sk(sk); \ | |
89 | if (sk_fullsock(__sk)) \ | |
90 | __ret = __cgroup_bpf_run_filter_skb(__sk, skb, \ | |
91 | BPF_CGROUP_INET_EGRESS); \ | |
92 | } \ | |
93 | __ret; \ | |
94 | }) | |
95 | ||
96 | #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) \ | |
97 | ({ \ | |
98 | int __ret = 0; \ | |
99 | if (cgroup_bpf_enabled && sk) { \ | |
100 | __ret = __cgroup_bpf_run_filter_sk(sk, \ | |
101 | BPF_CGROUP_INET_SOCK_CREATE); \ | |
102 | } \ | |
103 | __ret; \ | |
104 | }) | |
105 | ||
106 | #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) \ | |
107 | ({ \ | |
108 | int __ret = 0; \ | |
109 | if (cgroup_bpf_enabled && (sock_ops)->sk) { \ | |
110 | typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk); \ | |
111 | if (__sk && sk_fullsock(__sk)) \ | |
112 | __ret = __cgroup_bpf_run_filter_sock_ops(__sk, \ | |
113 | sock_ops, \ | |
114 | BPF_CGROUP_SOCK_OPS); \ | |
115 | } \ | |
116 | __ret; \ | |
117 | }) | |
118 | ||
119 | #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type, major, minor, access) \ | |
120 | ({ \ | |
121 | int __ret = 0; \ | |
122 | if (cgroup_bpf_enabled) \ | |
123 | __ret = __cgroup_bpf_check_dev_permission(type, major, minor, \ | |
124 | access, \ | |
125 | BPF_CGROUP_DEVICE); \ | |
126 | \ | |
127 | __ret; \ | |
128 | }) | |
129 | #else | |
130 | ||
131 | struct cgroup_bpf {}; | |
132 | static inline void cgroup_bpf_put(struct cgroup *cgrp) {} | |
133 | static inline int cgroup_bpf_inherit(struct cgroup *cgrp) { return 0; } | |
134 | ||
135 | #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; }) | |
136 | #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; }) | |
137 | #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; }) | |
138 | #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; }) | |
139 | #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type,major,minor,access) ({ 0; }) | |
140 | ||
141 | #endif /* CONFIG_CGROUP_BPF */ | |
142 | ||
143 | #endif /* _BPF_CGROUP_H */ |