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