include/linux/bpf-cgroup.h

   1 #ifndef _BPF_CGROUP_H
   2 #define _BPF_CGROUP_H
   3
   4 #include <linux/jump_label.h>
   5 #include <uapi/linux/bpf.h>
   6
   7 struct sock;
   8 struct cgroup;
   9 struct sk_buff;
  10 struct bpf_sock_ops_kern;
  11
  12 #ifdef CONFIG_CGROUP_BPF
  13
  14 extern struct static_key_false cgroup_bpf_enabled_key;
  15 #define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key)
  16
  17 struct cgroup_bpf {
  18         /*
  19          * Store two sets of bpf_prog pointers, one for programs that are
  20          * pinned directly to this cgroup, and one for those that are effective
  21          * when this cgroup is accessed.
  22          */
  23         struct bpf_prog *prog[MAX_BPF_ATTACH_TYPE];
  24         struct bpf_prog __rcu *effective[MAX_BPF_ATTACH_TYPE];
  25         bool disallow_override[MAX_BPF_ATTACH_TYPE];
  26 };
  27
  28 void cgroup_bpf_put(struct cgroup *cgrp);
  29 void cgroup_bpf_inherit(struct cgroup *cgrp, struct cgroup *parent);
  30
  31 int __cgroup_bpf_update(struct cgroup *cgrp, struct cgroup *parent,
  32                         struct bpf_prog *prog, enum bpf_attach_type type,
  33                         bool overridable);
  34
  35 /* Wrapper for __cgroup_bpf_update() protected by cgroup_mutex */
  36 int cgroup_bpf_update(struct cgroup *cgrp, struct bpf_prog *prog,
  37                       enum bpf_attach_type type, bool overridable);
  38
  39 int __cgroup_bpf_run_filter_skb(struct sock *sk,
  40                                 struct sk_buff *skb,
  41                                 enum bpf_attach_type type);
  42
  43 int __cgroup_bpf_run_filter_sk(struct sock *sk,
  44                                enum bpf_attach_type type);
  45
  46 int __cgroup_bpf_run_filter_sock_ops(struct sock *sk,
  47                                      struct bpf_sock_ops_kern *sock_ops,
  48                                      enum bpf_attach_type type);
  49
  50 /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
  51 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb)                             \
  52 ({                                                                            \
  53         int __ret = 0;                                                        \
  54         if (cgroup_bpf_enabled)                                               \
  55                 __ret = __cgroup_bpf_run_filter_skb(sk, skb,                  \
  56                                                     BPF_CGROUP_INET_INGRESS); \
  57                                                                               \
  58         __ret;                                                                \
  59 })
  60
  61 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb)                               \
  62 ({                                                                             \
  63         int __ret = 0;                                                         \
  64         if (cgroup_bpf_enabled && sk && sk == skb->sk) {                       \
  65                 typeof(sk) __sk = sk_to_full_sk(sk);                           \
  66                 if (sk_fullsock(__sk))                                         \
  67                         __ret = __cgroup_bpf_run_filter_skb(__sk, skb,         \
  68                                                       BPF_CGROUP_INET_EGRESS); \
  69         }                                                                      \
  70         __ret;                                                                 \
  71 })
  72
  73 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk)                                      \
  74 ({                                                                             \
  75         int __ret = 0;                                                         \
  76         if (cgroup_bpf_enabled && sk) {                                        \
  77                 __ret = __cgroup_bpf_run_filter_sk(sk,                         \
  78                                                  BPF_CGROUP_INET_SOCK_CREATE); \
  79         }                                                                      \
  80         __ret;                                                                 \
  81 })
  82
  83 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops)                                 \
  84 ({                                                                             \
  85         int __ret = 0;                                                         \
  86         if (cgroup_bpf_enabled && (sock_ops)->sk) {            \
  87                 typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk);               \
  88                 if (sk_fullsock(__sk))                                         \
  89                         __ret = __cgroup_bpf_run_filter_sock_ops(__sk,         \
  90                                                                  sock_ops,     \
  91                                                          BPF_CGROUP_SOCK_OPS); \
  92         }                                                                      \
  93         __ret;                                                                 \
  94 })
  95 #else
  96
  97 struct cgroup_bpf {};
  98 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
  99 static inline void cgroup_bpf_inherit(struct cgroup *cgrp,
 100                                       struct cgroup *parent) {}
 101
 102 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
 103 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
 104 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
 105 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; })
 106
 107 #endif /* CONFIG_CGROUP_BPF */
 108
 109 #endif /* _BPF_CGROUP_H */