411 lines
14 KiB
C
411 lines
14 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/bpf.h>
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#include <linux/errno.h>
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#include <linux/jump_label.h>
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#include <linux/percpu.h>
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#include <linux/percpu-refcount.h>
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#include <linux/rbtree.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_map;
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struct bpf_prog;
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struct bpf_sock_ops_kern;
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struct bpf_cgroup_storage;
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struct ctl_table;
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struct ctl_table_header;
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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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DECLARE_PER_CPU(struct bpf_cgroup_storage*,
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bpf_cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]);
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#define for_each_cgroup_storage_type(stype) \
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for (stype = 0; stype < MAX_BPF_CGROUP_STORAGE_TYPE; stype++)
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struct bpf_cgroup_storage_map;
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struct bpf_storage_buffer {
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struct rcu_head rcu;
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char data[0];
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};
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struct bpf_cgroup_storage {
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union {
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struct bpf_storage_buffer *buf;
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void __percpu *percpu_buf;
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};
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struct bpf_cgroup_storage_map *map;
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struct bpf_cgroup_storage_key key;
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struct list_head list;
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struct rb_node node;
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struct rcu_head rcu;
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};
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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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struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE];
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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 *inactive;
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/* reference counter used to detach bpf programs after cgroup removal */
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struct percpu_ref refcnt;
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/* cgroup_bpf is released using a work queue */
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struct work_struct release_work;
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};
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int cgroup_bpf_inherit(struct cgroup *cgrp);
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void cgroup_bpf_offline(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);
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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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int __cgroup_bpf_run_filter_sysctl(struct ctl_table_header *head,
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struct ctl_table *table, int write,
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void __user *buf, size_t *pcount,
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loff_t *ppos, void **new_buf,
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enum bpf_attach_type type);
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int __cgroup_bpf_run_filter_setsockopt(struct sock *sock, int *level,
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int *optname, char __user *optval,
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int *optlen, char **kernel_optval);
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int __cgroup_bpf_run_filter_getsockopt(struct sock *sk, int level,
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int optname, char __user *optval,
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int __user *optlen, int max_optlen,
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int retval);
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static inline enum bpf_cgroup_storage_type cgroup_storage_type(
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struct bpf_map *map)
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{
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if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
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return BPF_CGROUP_STORAGE_PERCPU;
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return BPF_CGROUP_STORAGE_SHARED;
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}
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static inline void bpf_cgroup_storage_set(struct bpf_cgroup_storage
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*storage[MAX_BPF_CGROUP_STORAGE_TYPE])
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{
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enum bpf_cgroup_storage_type stype;
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for_each_cgroup_storage_type(stype)
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this_cpu_write(bpf_cgroup_storage[stype], storage[stype]);
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}
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struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog,
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enum bpf_cgroup_storage_type stype);
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void bpf_cgroup_storage_free(struct bpf_cgroup_storage *storage);
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void bpf_cgroup_storage_link(struct bpf_cgroup_storage *storage,
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struct cgroup *cgroup,
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enum bpf_attach_type type);
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void bpf_cgroup_storage_unlink(struct bpf_cgroup_storage *storage);
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int bpf_cgroup_storage_assign(struct bpf_prog *prog, struct bpf_map *map);
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void bpf_cgroup_storage_release(struct bpf_prog *prog, struct bpf_map *map);
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int bpf_percpu_cgroup_storage_copy(struct bpf_map *map, void *key, void *value);
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int bpf_percpu_cgroup_storage_update(struct bpf_map *map, void *key,
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void *value, u64 flags);
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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_UDP4_RECVMSG_LOCK(sk, uaddr) \
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BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP4_RECVMSG, NULL)
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#define BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, uaddr) \
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BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_UDP6_RECVMSG, NULL)
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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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#define BPF_CGROUP_RUN_PROG_SYSCTL(head, table, write, buf, count, pos, nbuf) \
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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_sysctl(head, table, write, \
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buf, count, pos, nbuf, \
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BPF_CGROUP_SYSCTL); \
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__ret; \
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})
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#define BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock, level, optname, optval, optlen, \
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kernel_optval) \
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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_setsockopt(sock, level, \
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optname, optval, \
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optlen, \
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kernel_optval); \
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__ret; \
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})
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#define BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen) \
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({ \
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int __ret = 0; \
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if (cgroup_bpf_enabled) \
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get_user(__ret, optlen); \
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__ret; \
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})
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#define BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock, level, optname, optval, optlen, \
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max_optlen, retval) \
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({ \
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int __ret = retval; \
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if (cgroup_bpf_enabled) \
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__ret = __cgroup_bpf_run_filter_getsockopt(sock, level, \
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optname, optval, \
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optlen, max_optlen, \
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retval); \
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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 int cgroup_bpf_inherit(struct cgroup *cgrp) { return 0; }
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static inline void cgroup_bpf_offline(struct cgroup *cgrp) {}
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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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static inline void bpf_cgroup_storage_set(
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struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE]) {}
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static inline int bpf_cgroup_storage_assign(struct bpf_prog *prog,
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struct bpf_map *map) { return 0; }
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static inline void bpf_cgroup_storage_release(struct bpf_prog *prog,
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struct bpf_map *map) {}
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static inline struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(
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struct bpf_prog *prog, enum bpf_cgroup_storage_type stype) { return NULL; }
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static inline void bpf_cgroup_storage_free(
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struct bpf_cgroup_storage *storage) {}
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static inline int bpf_percpu_cgroup_storage_copy(struct bpf_map *map, void *key,
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void *value) {
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return 0;
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}
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static inline int bpf_percpu_cgroup_storage_update(struct bpf_map *map,
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void *key, void *value, u64 flags) {
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return 0;
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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_UDP4_RECVMSG_LOCK(sk, uaddr) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, uaddr) ({ 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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#define BPF_CGROUP_RUN_PROG_SYSCTL(head,table,write,buf,count,pos,nbuf) ({ 0; })
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#define BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen) ({ 0; })
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#define BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock, level, optname, optval, \
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optlen, max_optlen, retval) ({ retval; })
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#define BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock, level, optname, optval, optlen, \
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kernel_optval) ({ 0; })
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#define for_each_cgroup_storage_type(stype) for (; false; )
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#endif /* CONFIG_CGROUP_BPF */
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#endif /* _BPF_CGROUP_H */
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