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 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 */