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                                       void *t_ctx);
  71
  72 int __cgroup_bpf_run_filter_sock_ops(struct sock *sk,
  73                                      struct bpf_sock_ops_kern *sock_ops,
  74                                      enum bpf_attach_type type);
  75
  76 int __cgroup_bpf_check_dev_permission(short dev_type, u32 major, u32 minor,
  77                                       short access, enum bpf_attach_type type);
  78
  79 /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
  80 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb)                             \
  81 ({                                                                            \
  82         int __ret = 0;                                                        \
  83         if (cgroup_bpf_enabled)                                               \
  84                 __ret = __cgroup_bpf_run_filter_skb(sk, skb,                  \
  85                                                     BPF_CGROUP_INET_INGRESS); \
  86                                                                               \
  87         __ret;                                                                \
  88 })
  89
  90 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb)                               \
  91 ({                                                                             \
  92         int __ret = 0;                                                         \
  93         if (cgroup_bpf_enabled && sk && sk == skb->sk) {                       \
  94                 typeof(sk) __sk = sk_to_full_sk(sk);                           \
  95                 if (sk_fullsock(__sk))                                         \
  96                         __ret = __cgroup_bpf_run_filter_skb(__sk, skb,         \
  97                                                       BPF_CGROUP_INET_EGRESS); \
  98         }                                                                      \
  99         __ret;                                                                 \
 100 })
 101
 102 #define BPF_CGROUP_RUN_SK_PROG(sk, type)                                       \
 103 ({                                                                             \
 104         int __ret = 0;                                                         \
 105         if (cgroup_bpf_enabled) {                                              \
 106                 __ret = __cgroup_bpf_run_filter_sk(sk, type);                  \
 107         }                                                                      \
 108         __ret;                                                                 \
 109 })
 110
 111 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk)                                      \
 112         BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET_SOCK_CREATE)
 113
 114 #define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk)                                \
 115         BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET4_POST_BIND)
 116
 117 #define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk)                                \
 118         BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET6_POST_BIND)
 119
 120 #define BPF_CGROUP_RUN_SA_PROG(sk, uaddr, type)                                \
 121 ({                                                                             \
 122         int __ret = 0;                                                         \
 123         if (cgroup_bpf_enabled)                                                \
 124                 __ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type,     \
 125                                                           NULL);               \
 126         __ret;                                                                 \
 127 })
 128
 129 #define BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, type, t_ctx)                    \
 130 ({                                                                             \
 131         int __ret = 0;                                                         \
 132         if (cgroup_bpf_enabled) {                                              \
 133                 lock_sock(sk);                                                 \
 134                 __ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type,     \
 135                                                           t_ctx);              \
 136                 release_sock(sk);                                              \
 137         }                                                                      \
 138         __ret;                                                                 \
 139 })
 140
 141 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr)                              \
 142         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_BIND)
 143
 144 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr)                              \
 145         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_BIND)
 146
 147 #define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (cgroup_bpf_enabled && \
 148                                             sk->sk_prot->pre_connect)
 149
 150 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr)                           \
 151         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_CONNECT)
 152
 153 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr)                           \
 154         BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_CONNECT)
 155
 156 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr)                      \
 157         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET4_CONNECT, NULL)
 158
 159 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr)                      \
 160         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET6_CONNECT, NULL)
 161
 162 #define BPF_CGROUP_RUN_PROG_UDP4_SENDMSG_LOCK(sk, uaddr, t_ctx)                \
 163         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP4_SENDMSG, t_ctx)
 164
 165 #define BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, uaddr, t_ctx)                \
 166         BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP6_SENDMSG, t_ctx)
 167
 168 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops)                                 \
 169 ({                                                                             \
 170         int __ret = 0;                                                         \
 171         if (cgroup_bpf_enabled && (sock_ops)->sk) {            \
 172                 typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk);               \
 173                 if (__sk && sk_fullsock(__sk))                                 \
 174                         __ret = __cgroup_bpf_run_filter_sock_ops(__sk,         \
 175                                                                  sock_ops,     \
 176                                                          BPF_CGROUP_SOCK_OPS); \
 177         }                                                                      \
 178         __ret;                                                                 \
 179 })
 180
 181 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type, major, minor, access)         \
 182 ({                                                                            \
 183         int __ret = 0;                                                        \
 184         if (cgroup_bpf_enabled)                                               \
 185                 __ret = __cgroup_bpf_check_dev_permission(type, major, minor, \
 186                                                           access,             \
 187                                                           BPF_CGROUP_DEVICE); \
 188                                                                               \
 189         __ret;                                                                \
 190 })
 191 #else
 192
 193 struct cgroup_bpf {};
 194 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
 195 static inline int cgroup_bpf_inherit(struct cgroup *cgrp) { return 0; }
 196
 197 #define cgroup_bpf_enabled (0)
 198 #define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (0)
 199 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
 200 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
 201 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
 202 #define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr) ({ 0; })
 203 #define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr) ({ 0; })
 204 #define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk) ({ 0; })
 205 #define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk) ({ 0; })
 206 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr) ({ 0; })
 207 #define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr) ({ 0; })
 208 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr) ({ 0; })
 209 #define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr) ({ 0; })
 210 #define BPF_CGROUP_RUN_PROG_UDP4_SENDMSG_LOCK(sk, uaddr, t_ctx) ({ 0; })
 211 #define BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, uaddr, t_ctx) ({ 0; })
 212 #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; })
 213 #define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type,major,minor,access) ({ 0; })
 214
 215 #endif /* CONFIG_CGROUP_BPF */
 216
 217 #endif /* _BPF_CGROUP_H */