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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 08:27:48 +07:00
fdb5c4531c
If the kernel is compiled with CONFIG_CGROUP_BPF not enabled, it is not
possible to attach, detach or query IR BPF programs to /dev/lircN devices,
making them impossible to use. For embedded devices, it should be possible
to use IR decoding without cgroups or CONFIG_CGROUP_BPF enabled.
This change requires some refactoring, since bpf_prog_{attach,detach,query}
functions are now always compiled, but their code paths for cgroups need
moving out. Rather than a #ifdef CONFIG_CGROUP_BPF in kernel/bpf/syscall.c,
moving them to kernel/bpf/cgroup.c and kernel/bpf/sockmap.c does not
require #ifdefs since that is already conditionally compiled.
Fixes: f4364dcfc8 ("media: rc: introduce BPF_PROG_LIRC_MODE2")
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
244 lines
8.1 KiB
C
244 lines
8.1 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 sockaddr;
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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_addr(struct sock *sk,
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struct sockaddr *uaddr,
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enum bpf_attach_type type,
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void *t_ctx);
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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_SK_PROG(sk, type) \
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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_sk(sk, type); \
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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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BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET_SOCK_CREATE)
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#define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk) \
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BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET4_POST_BIND)
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#define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk) \
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BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET6_POST_BIND)
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#define BPF_CGROUP_RUN_SA_PROG(sk, uaddr, type) \
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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_sock_addr(sk, uaddr, type, \
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NULL); \
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__ret; \
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})
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#define BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, type, t_ctx) \
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({ \
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int __ret = 0; \
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if (cgroup_bpf_enabled) { \
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lock_sock(sk); \
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__ret = __cgroup_bpf_run_filter_sock_addr(sk, uaddr, type, \
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t_ctx); \
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release_sock(sk); \
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} \
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__ret; \
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})
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#define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr) \
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BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_BIND)
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#define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr) \
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BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_BIND)
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#define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (cgroup_bpf_enabled && \
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sk->sk_prot->pre_connect)
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#define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr) \
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BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_CONNECT)
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#define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr) \
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BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_CONNECT)
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#define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr) \
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BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET4_CONNECT, NULL)
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#define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr) \
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BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET6_CONNECT, NULL)
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#define BPF_CGROUP_RUN_PROG_UDP4_SENDMSG_LOCK(sk, uaddr, t_ctx) \
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BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP4_SENDMSG, t_ctx)
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#define BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, uaddr, t_ctx) \
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BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP6_SENDMSG, t_ctx)
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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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int cgroup_bpf_prog_attach(const union bpf_attr *attr,
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enum bpf_prog_type ptype, struct bpf_prog *prog);
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int cgroup_bpf_prog_detach(const union bpf_attr *attr,
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enum bpf_prog_type ptype);
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int cgroup_bpf_prog_query(const union bpf_attr *attr,
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union bpf_attr __user *uattr);
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#else
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struct bpf_prog;
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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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static inline int cgroup_bpf_prog_attach(const union bpf_attr *attr,
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enum bpf_prog_type ptype,
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struct bpf_prog *prog)
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{
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return -EINVAL;
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}
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static inline int cgroup_bpf_prog_detach(const union bpf_attr *attr,
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enum bpf_prog_type ptype)
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{
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return -EINVAL;
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}
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static inline int cgroup_bpf_prog_query(const union bpf_attr *attr,
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union bpf_attr __user *uattr)
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{
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return -EINVAL;
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}
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#define cgroup_bpf_enabled (0)
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#define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (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_INET4_BIND(sk, uaddr) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_UDP4_SENDMSG_LOCK(sk, uaddr, t_ctx) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, uaddr, t_ctx) ({ 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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