LXR linux/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
   8struct sock;
   9struct cgroup;
  10struct sk_buff;
  11struct bpf_sock_ops_kern;
  12
  13#ifdef CONFIG_CGROUP_BPF
  14
  15extern struct static_key_false cgroup_bpf_enabled_key;
  16#define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key)
  17
  18struct 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
  29void cgroup_bpf_put(struct cgroup *cgrp);
  30void cgroup_bpf_inherit(struct cgroup *cgrp, struct cgroup *parent);
  31
  32int __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 */
  37int cgroup_bpf_update(struct cgroup *cgrp, struct bpf_prog *prog,
  38                      enum bpf_attach_type type, bool overridable);
  39
  40int __cgroup_bpf_run_filter_skb(struct sock *sk,
  41                                struct sk_buff *skb,
  42                                enum bpf_attach_type type);
  43
  44int __cgroup_bpf_run_filter_sk(struct sock *sk,
  45                               enum bpf_attach_type type);
  46
  47int __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
  98struct cgroup_bpf {};
  99static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
 100static 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 */
 111