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 sockaddr;
  10 struct cgroup;
  11 struct sk_buff;
  12 struct bpf_sock_ops_kern;
  13
  14 #ifdef CONFIG_CGROUP_BPF
  15
  16 extern struct static_key_false cgroup_bpf_enabled_key;
  17 #define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key)
  18
  19 struct bpf_prog_list {
  20         struct list_head node;
  21         struct bpf_prog *prog;
  22 };
  23
  24 struct bpf_prog_array;
  25
  26 struct cgroup_bpf {
  27         /* array of effective progs in this cgroup */
  28         struct bpf_prog_array __rcu *effective[MAX_BPF_ATTACH_TYPE];
  29
  30         /* attached progs to this cgroup and attach flags
  31          * when flags == 0 or BPF_F_ALLOW_OVERRIDE the progs list will
  32          * have either zero or one element
  33          * when BPF_F_ALLOW_MULTI the list can have up to BPF_CGROUP_MAX_PROGS
  34          */
  35         struct list_head progs[MAX_BPF_ATTACH_TYPE];
  36         u32 flags[MAX_BPF_ATTACH_TYPE];
  37
  38         /* temp storage for effective prog array used by prog_attach/detach */
  39         struct bpf_prog_array __rcu *inactive;
  40 };
  41
  42 void cgroup_bpf_put(struct cgroup *cgrp);
  43 int cgroup_bpf_inherit(struct cgroup *cgrp);
  44
  45 int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
  46                         enum bpf_attach_type type, u32 flags);
  47 int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
  48                         enum bpf_attach_type type, u32 flags);
  49 int __cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
  50                        union bpf_attr __user *uattr);
  51
  52 /* Wrapper for __cgroup_bpf_*() protected by cgroup_mutex */
  53 int cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
  54                       enum bpf_attach_type type, u32 flags);
  55 int cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
  56                       enum bpf_attach_type type, u32 flags);
  57 int cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
  58                      union bpf_attr __user *uattr);
  59
  60 int __cgroup_bpf_run_filter_skb(struct sock *sk,
  61                                 struct sk_buff *skb,
  62                                 enum bpf_attach_type type);
  63
  64 int __cgroup_bpf_run_filter_sk(struct sock *sk,
  65                                enum bpf_attach_type type);
  66
  67 int __cgroup_bpf_run_filter_sock_addr(struct sock *sk,
  68                                       struct sockaddr *uaddr,
  69                                       enum bpf_attach_type type);
  70
  71 int __cgroup_bpf_run_filter_sock_ops(struct sock *sk,
  72                                      struct bpf_sock_ops_kern *sock_ops,
  73                                      enum bpf_attach_type type);
  74
  75 int __cgroup_bpf_check_dev_permission(short dev_type, u32 major, u32 minor,
  76                                       short access, enum bpf_attach_type type);
  77
  78 /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
  79 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb)                             \
  80 ({                                                                            \
  81         int __ret = 0;                                                        \
  82         if (cgroup_bpf_enabled)                                               \
  83                 __ret = __cgroup_bpf_run_filter_skb(sk, skb,                  \
  84                                                     BPF_CGROUP_INET_INGRESS); \
  85                                                                               \
  86         __ret;                                                                \
  87 })
  88
  89 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb)                               \
  90 ({                                                                             \
  91         int __ret = 0;                                                         \
  92         if (cgroup_bpf_enabled && sk && sk == skb->sk) {                       \
  93                 typeof(sk) __sk = sk_to_full_sk(sk);                           \
  94                 if (sk_fullsock(__sk))                                         \
  95                         __ret = __cgroup_bpf_run_filter_skb(__sk, skb,         \
  96                                                       BPF_CGROUP_INET_EGRESS); \
  97         }                                                                      \
  98         __ret;                                                                 \
  99 })
 100
 101 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk)                                      \
 102 ({                                                                             \
 103         int __ret = 0;                                                         \
 104         if (cgroup_bpf_enabled) {                                              \
 105                 __ret = __cgroup_bpf_run_filter_sk(sk,                         \
 106                                                  BPF_CGROUP_INET_SOCK_CREATE); \
 107         }                                                                      \
 108         __ret;                                                                 \
 109 })
 110
 111 #define BPF_CGROUP_RUN_SA_PROG(sk, uaddr, type)                                \
 112 ({                                                                             \
 113         int __ret = 0;                                                         \
 114         if (cgroup_bpf_enabled)                                                \
 115                 __ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type);    \
 116         __ret;                                                                 \
 117 })
 118
 119 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr)                              \
 120         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_BIND)
 121
 122 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr)                              \
 123         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_BIND)
 124
 125 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops)                                 \
 126 ({                                                                             \
 127         int __ret = 0;                                                         \
 128         if (cgroup_bpf_enabled && (sock_ops)->sk) {            \
 129                 typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk);               \
 130                 if (__sk && sk_fullsock(__sk))                                 \
 131                         __ret = __cgroup_bpf_run_filter_sock_ops(__sk,         \
 132                                                                  sock_ops,     \
 133                                                          BPF_CGROUP_SOCK_OPS); \
 134         }                                                                      \
 135         __ret;                                                                 \
 136 })
 137
 138 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type, major, minor, access)         \
 139 ({                                                                            \
 140         int __ret = 0;                                                        \
 141         if (cgroup_bpf_enabled)                                               \
 142                 __ret = __cgroup_bpf_check_dev_permission(type, major, minor, \
 143                                                           access,             \
 144                                                           BPF_CGROUP_DEVICE); \
 145                                                                               \
 146         __ret;                                                                \
 147 })
 148 #else
 149
 150 struct cgroup_bpf {};
 151 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
 152 static inline int cgroup_bpf_inherit(struct cgroup *cgrp) { return 0; }
 153
 154 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
 155 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
 156 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
 157 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr) ({ 0; })
 158 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr) ({ 0; })
 159 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; })
 160 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type,major,minor,access) ({ 0; })
 161
 162 #endif /* CONFIG_CGROUP_BPF */
 163
 164 #endif /* _BPF_CGROUP_H */