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 cgroup_bpf {
  19         /*
  20          * Store two sets of bpf_prog pointers, one for programs that are
  21          * pinned directly to this cgroup, and one for those that are effective
  22          * when this cgroup is accessed.
  23          */
  24         struct bpf_prog *prog[MAX_BPF_ATTACH_TYPE];
  25         struct bpf_prog __rcu *effective[MAX_BPF_ATTACH_TYPE];
  26         bool disallow_override[MAX_BPF_ATTACH_TYPE];
  27 };
  28
  29 void cgroup_bpf_put(struct cgroup *cgrp);
  30 void cgroup_bpf_inherit(struct cgroup *cgrp, struct cgroup *parent);
  31
  32 int __cgroup_bpf_update(struct cgroup *cgrp, struct cgroup *parent,
  33                         struct bpf_prog *prog, enum bpf_attach_type type,
  34                         bool overridable);
  35
  36 /* Wrapper for __cgroup_bpf_update() protected by cgroup_mutex */
  37 int cgroup_bpf_update(struct cgroup *cgrp, struct bpf_prog *prog,
  38                       enum bpf_attach_type type, bool overridable);
  39
  40 int __cgroup_bpf_run_filter_skb(struct sock *sk,
  41                                 struct sk_buff *skb,
  42                                 enum bpf_attach_type type);
  43
  44 int __cgroup_bpf_run_filter_sk(struct sock *sk,
  45                                enum bpf_attach_type type);
  46
  47 int __cgroup_bpf_run_filter_sock_ops(struct sock *sk,
  48                                      struct bpf_sock_ops_kern *sock_ops,
  49                                      enum bpf_attach_type type);
  50
  51 /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
  52 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb)                             \
  53 ({                                                                            \
  54         int __ret = 0;                                                        \
  55         if (cgroup_bpf_enabled)                                               \
  56                 __ret = __cgroup_bpf_run_filter_skb(sk, skb,                  \
  57                                                     BPF_CGROUP_INET_INGRESS); \
  58                                                                               \
  59         __ret;                                                                \
  60 })
  61
  62 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb)                               \
  63 ({                                                                             \
  64         int __ret = 0;                                                         \
  65         if (cgroup_bpf_enabled && sk && sk == skb->sk) {                       \
  66                 typeof(sk) __sk = sk_to_full_sk(sk);                           \
  67                 if (sk_fullsock(__sk))                                         \
  68                         __ret = __cgroup_bpf_run_filter_skb(__sk, skb,         \
  69                                                       BPF_CGROUP_INET_EGRESS); \
  70         }                                                                      \
  71         __ret;                                                                 \
  72 })
  73
  74 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk)                                      \
  75 ({                                                                             \
  76         int __ret = 0;                                                         \
  77         if (cgroup_bpf_enabled && sk) {                                        \
  78                 __ret = __cgroup_bpf_run_filter_sk(sk,                         \
  79                                                  BPF_CGROUP_INET_SOCK_CREATE); \
  80         }                                                                      \
  81         __ret;                                                                 \
  82 })
  83
  84 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops)                                 \
  85 ({                                                                             \
  86         int __ret = 0;                                                         \
  87         if (cgroup_bpf_enabled && (sock_ops)->sk) {            \
  88                 typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk);               \
  89                 if (__sk && sk_fullsock(__sk))                                 \
  90                         __ret = __cgroup_bpf_run_filter_sock_ops(__sk,         \
  91                                                                  sock_ops,     \
  92                                                          BPF_CGROUP_SOCK_OPS); \
  93         }                                                                      \
  94         __ret;                                                                 \
  95 })
  96 #else
  97
  98 struct cgroup_bpf {};
  99 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
 100 static inline void cgroup_bpf_inherit(struct cgroup *cgrp,
 101                                       struct cgroup *parent) {}
 102
 103 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
 104 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
 105 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
 106 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; })
 107
 108 #endif /* CONFIG_CGROUP_BPF */
 109
 110 #endif /* _BPF_CGROUP_H */