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 *effective[MAX_BPF_ATTACH_TYPE];
  24 };
  25
  26 void cgroup_bpf_put(struct cgroup *cgrp);
  27 void cgroup_bpf_inherit(struct cgroup *cgrp, struct cgroup *parent);
  28
  29 void __cgroup_bpf_update(struct cgroup *cgrp,
  30                          struct cgroup *parent,
  31                          struct bpf_prog *prog,
  32                          enum bpf_attach_type type);
  33
  34 /* Wrapper for __cgroup_bpf_update() protected by cgroup_mutex */
  35 void cgroup_bpf_update(struct cgroup *cgrp,
  36                        struct bpf_prog *prog,
  37                        enum bpf_attach_type type);
  38
  39 int __cgroup_bpf_run_filter_skb(struct sock *sk,
  40                                 struct sk_buff *skb,
  41                                 enum bpf_attach_type type);
  42
  43 /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
  44 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb)                             \
  45 ({                                                                            \
  46         int __ret = 0;                                                        \
  47         if (cgroup_bpf_enabled)                                               \
  48                 __ret = __cgroup_bpf_run_filter_skb(sk, skb,                  \
  49                                                     BPF_CGROUP_INET_INGRESS); \
  50                                                                               \
  51         __ret;                                                                \
  52 })
  53
  54 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb)                               \
  55 ({                                                                             \
  56         int __ret = 0;                                                         \
  57         if (cgroup_bpf_enabled && sk && sk == skb->sk) {                       \
  58                 typeof(sk) __sk = sk_to_full_sk(sk);                           \
  59                 if (sk_fullsock(__sk))                                         \
  60                         __ret = __cgroup_bpf_run_filter_skb(__sk, skb,         \
  61                                                       BPF_CGROUP_INET_EGRESS); \
  62         }                                                                      \
  63         __ret;                                                                 \
  64 })
  65
  66 #else
  67
  68 struct cgroup_bpf {};
  69 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
  70 static inline void cgroup_bpf_inherit(struct cgroup *cgrp,
  71                                       struct cgroup *parent) {}
  72
  73 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
  74 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
  75
  76 #endif /* CONFIG_CGROUP_BPF */
  77
  78 #endif /* _BPF_CGROUP_H */