Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 1 | #ifndef _BPF_CGROUP_H |
| 2 | #define _BPF_CGROUP_H |
| 3 | |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 4 | #include <linux/jump_label.h> |
| 5 | #include <uapi/linux/bpf.h> |
| 6 | |
| 7 | struct sock; |
| 8 | struct cgroup; |
| 9 | struct sk_buff; |
Lawrence Brakmo | 40304b2 | 2017-06-30 20:02:40 -0700 | [diff] [blame] | 10 | struct bpf_sock_ops_kern; |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 11 | |
| 12 | #ifdef CONFIG_CGROUP_BPF |
| 13 | |
| 14 | extern struct static_key_false cgroup_bpf_enabled_key; |
| 15 | #define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key) |
| 16 | |
Alexei Starovoitov | 324bda9e6 | 2017-10-02 22:50:21 -0700 | [diff] [blame^] | 17 | struct bpf_prog_list { |
| 18 | struct list_head node; |
| 19 | struct bpf_prog *prog; |
| 20 | }; |
| 21 | |
| 22 | struct bpf_prog_array; |
| 23 | |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 24 | struct cgroup_bpf { |
Alexei Starovoitov | 324bda9e6 | 2017-10-02 22:50:21 -0700 | [diff] [blame^] | 25 | /* array of effective progs in this cgroup */ |
| 26 | struct bpf_prog_array __rcu *effective[MAX_BPF_ATTACH_TYPE]; |
| 27 | |
| 28 | /* attached progs to this cgroup and attach flags |
| 29 | * when flags == 0 or BPF_F_ALLOW_OVERRIDE the progs list will |
| 30 | * have either zero or one element |
| 31 | * when BPF_F_ALLOW_MULTI the list can have up to BPF_CGROUP_MAX_PROGS |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 32 | */ |
Alexei Starovoitov | 324bda9e6 | 2017-10-02 22:50:21 -0700 | [diff] [blame^] | 33 | struct list_head progs[MAX_BPF_ATTACH_TYPE]; |
| 34 | u32 flags[MAX_BPF_ATTACH_TYPE]; |
| 35 | |
| 36 | /* temp storage for effective prog array used by prog_attach/detach */ |
| 37 | struct bpf_prog_array __rcu *inactive; |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 38 | }; |
| 39 | |
| 40 | void cgroup_bpf_put(struct cgroup *cgrp); |
Alexei Starovoitov | 324bda9e6 | 2017-10-02 22:50:21 -0700 | [diff] [blame^] | 41 | int cgroup_bpf_inherit(struct cgroup *cgrp); |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 42 | |
Alexei Starovoitov | 324bda9e6 | 2017-10-02 22:50:21 -0700 | [diff] [blame^] | 43 | int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog, |
| 44 | enum bpf_attach_type type, u32 flags); |
| 45 | int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog, |
| 46 | enum bpf_attach_type type, u32 flags); |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 47 | |
Alexei Starovoitov | 324bda9e6 | 2017-10-02 22:50:21 -0700 | [diff] [blame^] | 48 | /* Wrapper for __cgroup_bpf_*() protected by cgroup_mutex */ |
| 49 | int cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog, |
| 50 | enum bpf_attach_type type, u32 flags); |
| 51 | int cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog, |
| 52 | enum bpf_attach_type type, u32 flags); |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 53 | |
David Ahern | b2cd125 | 2016-12-01 08:48:03 -0800 | [diff] [blame] | 54 | int __cgroup_bpf_run_filter_skb(struct sock *sk, |
| 55 | struct sk_buff *skb, |
| 56 | enum bpf_attach_type type); |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 57 | |
David Ahern | 61023658 | 2016-12-01 08:48:04 -0800 | [diff] [blame] | 58 | int __cgroup_bpf_run_filter_sk(struct sock *sk, |
| 59 | enum bpf_attach_type type); |
| 60 | |
Lawrence Brakmo | 40304b2 | 2017-06-30 20:02:40 -0700 | [diff] [blame] | 61 | int __cgroup_bpf_run_filter_sock_ops(struct sock *sk, |
| 62 | struct bpf_sock_ops_kern *sock_ops, |
| 63 | enum bpf_attach_type type); |
| 64 | |
David Ahern | b2cd125 | 2016-12-01 08:48:03 -0800 | [diff] [blame] | 65 | /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */ |
| 66 | #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb) \ |
| 67 | ({ \ |
| 68 | int __ret = 0; \ |
| 69 | if (cgroup_bpf_enabled) \ |
| 70 | __ret = __cgroup_bpf_run_filter_skb(sk, skb, \ |
| 71 | BPF_CGROUP_INET_INGRESS); \ |
| 72 | \ |
| 73 | __ret; \ |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 74 | }) |
| 75 | |
David Ahern | b2cd125 | 2016-12-01 08:48:03 -0800 | [diff] [blame] | 76 | #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb) \ |
| 77 | ({ \ |
| 78 | int __ret = 0; \ |
| 79 | if (cgroup_bpf_enabled && sk && sk == skb->sk) { \ |
| 80 | typeof(sk) __sk = sk_to_full_sk(sk); \ |
| 81 | if (sk_fullsock(__sk)) \ |
| 82 | __ret = __cgroup_bpf_run_filter_skb(__sk, skb, \ |
| 83 | BPF_CGROUP_INET_EGRESS); \ |
| 84 | } \ |
| 85 | __ret; \ |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 86 | }) |
| 87 | |
David Ahern | 61023658 | 2016-12-01 08:48:04 -0800 | [diff] [blame] | 88 | #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) \ |
| 89 | ({ \ |
| 90 | int __ret = 0; \ |
| 91 | if (cgroup_bpf_enabled && sk) { \ |
| 92 | __ret = __cgroup_bpf_run_filter_sk(sk, \ |
| 93 | BPF_CGROUP_INET_SOCK_CREATE); \ |
| 94 | } \ |
| 95 | __ret; \ |
| 96 | }) |
| 97 | |
Lawrence Brakmo | 40304b2 | 2017-06-30 20:02:40 -0700 | [diff] [blame] | 98 | #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) \ |
| 99 | ({ \ |
| 100 | int __ret = 0; \ |
| 101 | if (cgroup_bpf_enabled && (sock_ops)->sk) { \ |
| 102 | typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk); \ |
WANG Cong | df39a9f | 2017-07-17 11:42:55 -0700 | [diff] [blame] | 103 | if (__sk && sk_fullsock(__sk)) \ |
Lawrence Brakmo | 40304b2 | 2017-06-30 20:02:40 -0700 | [diff] [blame] | 104 | __ret = __cgroup_bpf_run_filter_sock_ops(__sk, \ |
| 105 | sock_ops, \ |
| 106 | BPF_CGROUP_SOCK_OPS); \ |
| 107 | } \ |
| 108 | __ret; \ |
| 109 | }) |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 110 | #else |
| 111 | |
| 112 | struct cgroup_bpf {}; |
| 113 | static inline void cgroup_bpf_put(struct cgroup *cgrp) {} |
Alexei Starovoitov | 324bda9e6 | 2017-10-02 22:50:21 -0700 | [diff] [blame^] | 114 | static inline int cgroup_bpf_inherit(struct cgroup *cgrp) { return 0; } |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 115 | |
| 116 | #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; }) |
| 117 | #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; }) |
David Ahern | 61023658 | 2016-12-01 08:48:04 -0800 | [diff] [blame] | 118 | #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; }) |
Lawrence Brakmo | 40304b2 | 2017-06-30 20:02:40 -0700 | [diff] [blame] | 119 | #define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; }) |
Daniel Mack | 3007098 | 2016-11-23 16:52:26 +0100 | [diff] [blame] | 120 | |
| 121 | #endif /* CONFIG_CGROUP_BPF */ |
| 122 | |
| 123 | #endif /* _BPF_CGROUP_H */ |