ebc614f687
Cgroup v2 lacks the device controller, provided by cgroup v1. This patch adds a new eBPF program type, which in combination of previously added ability to attach multiple eBPF programs to a cgroup, will provide a similar functionality, but with some additional flexibility. This patch introduces a BPF_PROG_TYPE_CGROUP_DEVICE program type. A program takes major and minor device numbers, device type (block/character) and access type (mknod/read/write) as parameters and returns an integer which defines if the operation should be allowed or terminated with -EPERM. Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Tejun Heo <tj@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
144 lines
4.5 KiB
C
144 lines
4.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BPF_CGROUP_H
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#define _BPF_CGROUP_H
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#include <linux/jump_label.h>
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#include <uapi/linux/bpf.h>
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struct sock;
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struct cgroup;
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struct sk_buff;
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struct bpf_sock_ops_kern;
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#ifdef CONFIG_CGROUP_BPF
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extern struct static_key_false cgroup_bpf_enabled_key;
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#define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key)
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struct bpf_prog_list {
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struct list_head node;
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struct bpf_prog *prog;
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};
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struct bpf_prog_array;
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struct cgroup_bpf {
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/* array of effective progs in this cgroup */
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struct bpf_prog_array __rcu *effective[MAX_BPF_ATTACH_TYPE];
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/* attached progs to this cgroup and attach flags
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* when flags == 0 or BPF_F_ALLOW_OVERRIDE the progs list will
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* have either zero or one element
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* when BPF_F_ALLOW_MULTI the list can have up to BPF_CGROUP_MAX_PROGS
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*/
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struct list_head progs[MAX_BPF_ATTACH_TYPE];
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u32 flags[MAX_BPF_ATTACH_TYPE];
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/* temp storage for effective prog array used by prog_attach/detach */
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struct bpf_prog_array __rcu *inactive;
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};
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void cgroup_bpf_put(struct cgroup *cgrp);
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int cgroup_bpf_inherit(struct cgroup *cgrp);
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int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
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enum bpf_attach_type type, u32 flags);
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int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
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enum bpf_attach_type type, u32 flags);
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int __cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
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union bpf_attr __user *uattr);
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/* Wrapper for __cgroup_bpf_*() protected by cgroup_mutex */
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int cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
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enum bpf_attach_type type, u32 flags);
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int cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
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enum bpf_attach_type type, u32 flags);
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int cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
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union bpf_attr __user *uattr);
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int __cgroup_bpf_run_filter_skb(struct sock *sk,
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struct sk_buff *skb,
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enum bpf_attach_type type);
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int __cgroup_bpf_run_filter_sk(struct sock *sk,
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enum bpf_attach_type type);
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int __cgroup_bpf_run_filter_sock_ops(struct sock *sk,
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struct bpf_sock_ops_kern *sock_ops,
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enum bpf_attach_type type);
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int __cgroup_bpf_check_dev_permission(short dev_type, u32 major, u32 minor,
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short access, enum bpf_attach_type type);
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/* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
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#define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb) \
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({ \
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int __ret = 0; \
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if (cgroup_bpf_enabled) \
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__ret = __cgroup_bpf_run_filter_skb(sk, skb, \
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BPF_CGROUP_INET_INGRESS); \
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\
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__ret; \
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})
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#define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb) \
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({ \
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int __ret = 0; \
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if (cgroup_bpf_enabled && sk && sk == skb->sk) { \
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typeof(sk) __sk = sk_to_full_sk(sk); \
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if (sk_fullsock(__sk)) \
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__ret = __cgroup_bpf_run_filter_skb(__sk, skb, \
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BPF_CGROUP_INET_EGRESS); \
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} \
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__ret; \
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})
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#define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) \
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({ \
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int __ret = 0; \
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if (cgroup_bpf_enabled && sk) { \
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__ret = __cgroup_bpf_run_filter_sk(sk, \
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BPF_CGROUP_INET_SOCK_CREATE); \
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} \
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__ret; \
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})
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#define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) \
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({ \
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int __ret = 0; \
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if (cgroup_bpf_enabled && (sock_ops)->sk) { \
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typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk); \
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if (__sk && sk_fullsock(__sk)) \
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__ret = __cgroup_bpf_run_filter_sock_ops(__sk, \
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sock_ops, \
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BPF_CGROUP_SOCK_OPS); \
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} \
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__ret; \
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})
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#define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type, major, minor, access) \
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({ \
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int __ret = 0; \
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if (cgroup_bpf_enabled) \
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__ret = __cgroup_bpf_check_dev_permission(type, major, minor, \
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access, \
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BPF_CGROUP_DEVICE); \
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\
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__ret; \
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})
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#else
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struct cgroup_bpf {};
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static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
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static inline int cgroup_bpf_inherit(struct cgroup *cgrp) { return 0; }
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#define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type,major,minor,access) ({ 0; })
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#endif /* CONFIG_CGROUP_BPF */
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#endif /* _BPF_CGROUP_H */
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