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TOMOYO Linux Cross Reference
Linux/include/linux/bpf.h

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  1 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
  2  *
  3  * This program is free software; you can redistribute it and/or
  4  * modify it under the terms of version 2 of the GNU General Public
  5  * License as published by the Free Software Foundation.
  6  */
  7 #ifndef _LINUX_BPF_H
  8 #define _LINUX_BPF_H 1
  9 
 10 #include <uapi/linux/bpf.h>
 11 #include <linux/workqueue.h>
 12 #include <linux/file.h>
 13 #include <linux/perf_event.h>
 14 
 15 struct bpf_map;
 16 
 17 /* map is generic key/value storage optionally accesible by eBPF programs */
 18 struct bpf_map_ops {
 19         /* funcs callable from userspace (via syscall) */
 20         struct bpf_map *(*map_alloc)(union bpf_attr *attr);
 21         void (*map_free)(struct bpf_map *);
 22         int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
 23 
 24         /* funcs callable from userspace and from eBPF programs */
 25         void *(*map_lookup_elem)(struct bpf_map *map, void *key);
 26         int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
 27         int (*map_delete_elem)(struct bpf_map *map, void *key);
 28 
 29         /* funcs called by prog_array and perf_event_array map */
 30         void *(*map_fd_get_ptr) (struct bpf_map *map, int fd);
 31         void (*map_fd_put_ptr) (void *ptr);
 32 };
 33 
 34 struct bpf_map {
 35         atomic_t refcnt;
 36         enum bpf_map_type map_type;
 37         u32 key_size;
 38         u32 value_size;
 39         u32 max_entries;
 40         const struct bpf_map_ops *ops;
 41         struct work_struct work;
 42 };
 43 
 44 struct bpf_map_type_list {
 45         struct list_head list_node;
 46         const struct bpf_map_ops *ops;
 47         enum bpf_map_type type;
 48 };
 49 
 50 /* function argument constraints */
 51 enum bpf_arg_type {
 52         ARG_DONTCARE = 0,       /* unused argument in helper function */
 53 
 54         /* the following constraints used to prototype
 55          * bpf_map_lookup/update/delete_elem() functions
 56          */
 57         ARG_CONST_MAP_PTR,      /* const argument used as pointer to bpf_map */
 58         ARG_PTR_TO_MAP_KEY,     /* pointer to stack used as map key */
 59         ARG_PTR_TO_MAP_VALUE,   /* pointer to stack used as map value */
 60 
 61         /* the following constraints used to prototype bpf_memcmp() and other
 62          * functions that access data on eBPF program stack
 63          */
 64         ARG_PTR_TO_STACK,       /* any pointer to eBPF program stack */
 65         ARG_CONST_STACK_SIZE,   /* number of bytes accessed from stack */
 66 
 67         ARG_PTR_TO_CTX,         /* pointer to context */
 68         ARG_ANYTHING,           /* any (initialized) argument is ok */
 69 };
 70 
 71 /* type of values returned from helper functions */
 72 enum bpf_return_type {
 73         RET_INTEGER,                    /* function returns integer */
 74         RET_VOID,                       /* function doesn't return anything */
 75         RET_PTR_TO_MAP_VALUE_OR_NULL,   /* returns a pointer to map elem value or NULL */
 76 };
 77 
 78 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
 79  * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
 80  * instructions after verifying
 81  */
 82 struct bpf_func_proto {
 83         u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 84         bool gpl_only;
 85         enum bpf_return_type ret_type;
 86         enum bpf_arg_type arg1_type;
 87         enum bpf_arg_type arg2_type;
 88         enum bpf_arg_type arg3_type;
 89         enum bpf_arg_type arg4_type;
 90         enum bpf_arg_type arg5_type;
 91 };
 92 
 93 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
 94  * the first argument to eBPF programs.
 95  * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
 96  */
 97 struct bpf_context;
 98 
 99 enum bpf_access_type {
100         BPF_READ = 1,
101         BPF_WRITE = 2
102 };
103 
104 struct bpf_verifier_ops {
105         /* return eBPF function prototype for verification */
106         const struct bpf_func_proto *(*get_func_proto)(enum bpf_func_id func_id);
107 
108         /* return true if 'size' wide access at offset 'off' within bpf_context
109          * with 'type' (read or write) is allowed
110          */
111         bool (*is_valid_access)(int off, int size, enum bpf_access_type type);
112 
113         u32 (*convert_ctx_access)(enum bpf_access_type type, int dst_reg,
114                                   int src_reg, int ctx_off,
115                                   struct bpf_insn *insn);
116 };
117 
118 struct bpf_prog_type_list {
119         struct list_head list_node;
120         const struct bpf_verifier_ops *ops;
121         enum bpf_prog_type type;
122 };
123 
124 struct bpf_prog;
125 
126 struct bpf_prog_aux {
127         atomic_t refcnt;
128         u32 used_map_cnt;
129         const struct bpf_verifier_ops *ops;
130         struct bpf_map **used_maps;
131         struct bpf_prog *prog;
132         union {
133                 struct work_struct work;
134                 struct rcu_head rcu;
135         };
136 };
137 
138 struct bpf_array {
139         struct bpf_map map;
140         u32 elem_size;
141         /* 'ownership' of prog_array is claimed by the first program that
142          * is going to use this map or by the first program which FD is stored
143          * in the map to make sure that all callers and callees have the same
144          * prog_type and JITed flag
145          */
146         enum bpf_prog_type owner_prog_type;
147         bool owner_jited;
148         union {
149                 char value[0] __aligned(8);
150                 void *ptrs[0] __aligned(8);
151         };
152 };
153 #define MAX_TAIL_CALL_CNT 32
154 
155 u64 bpf_tail_call(u64 ctx, u64 r2, u64 index, u64 r4, u64 r5);
156 void bpf_fd_array_map_clear(struct bpf_map *map);
157 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
158 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
159 
160 #ifdef CONFIG_BPF_SYSCALL
161 void bpf_register_prog_type(struct bpf_prog_type_list *tl);
162 void bpf_register_map_type(struct bpf_map_type_list *tl);
163 
164 struct bpf_prog *bpf_prog_get(u32 ufd);
165 void bpf_prog_put(struct bpf_prog *prog);
166 void bpf_prog_put_rcu(struct bpf_prog *prog);
167 
168 struct bpf_map *bpf_map_get(struct fd f);
169 void bpf_map_put(struct bpf_map *map);
170 
171 /* verify correctness of eBPF program */
172 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr);
173 #else
174 static inline void bpf_register_prog_type(struct bpf_prog_type_list *tl)
175 {
176 }
177 
178 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
179 {
180         return ERR_PTR(-EOPNOTSUPP);
181 }
182 
183 static inline void bpf_prog_put(struct bpf_prog *prog)
184 {
185 }
186 #endif /* CONFIG_BPF_SYSCALL */
187 
188 /* verifier prototypes for helper functions called from eBPF programs */
189 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
190 extern const struct bpf_func_proto bpf_map_update_elem_proto;
191 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
192 
193 extern const struct bpf_func_proto bpf_perf_event_read_proto;
194 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
195 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
196 extern const struct bpf_func_proto bpf_tail_call_proto;
197 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
198 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
199 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
200 extern const struct bpf_func_proto bpf_get_current_comm_proto;
201 extern const struct bpf_func_proto bpf_skb_vlan_push_proto;
202 extern const struct bpf_func_proto bpf_skb_vlan_pop_proto;
203 
204 #endif /* _LINUX_BPF_H */
205 

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