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

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  1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
  3  *
  4  * This program is free software; you can redistribute it and/or
  5  * modify it under the terms of version 2 of the GNU General Public
  6  * License as published by the Free Software Foundation.
  7  */
  8 #ifndef _UAPI__LINUX_BPF_H__
  9 #define _UAPI__LINUX_BPF_H__
 10 
 11 #include <linux/types.h>
 12 #include <linux/bpf_common.h>
 13 
 14 /* Extended instruction set based on top of classic BPF */
 15 
 16 /* instruction classes */
 17 #define BPF_ALU64       0x07    /* alu mode in double word width */
 18 
 19 /* ld/ldx fields */
 20 #define BPF_DW          0x18    /* double word (64-bit) */
 21 #define BPF_XADD        0xc0    /* exclusive add */
 22 
 23 /* alu/jmp fields */
 24 #define BPF_MOV         0xb0    /* mov reg to reg */
 25 #define BPF_ARSH        0xc0    /* sign extending arithmetic shift right */
 26 
 27 /* change endianness of a register */
 28 #define BPF_END         0xd0    /* flags for endianness conversion: */
 29 #define BPF_TO_LE       0x00    /* convert to little-endian */
 30 #define BPF_TO_BE       0x08    /* convert to big-endian */
 31 #define BPF_FROM_LE     BPF_TO_LE
 32 #define BPF_FROM_BE     BPF_TO_BE
 33 
 34 /* jmp encodings */
 35 #define BPF_JNE         0x50    /* jump != */
 36 #define BPF_JLT         0xa0    /* LT is unsigned, '<' */
 37 #define BPF_JLE         0xb0    /* LE is unsigned, '<=' */
 38 #define BPF_JSGT        0x60    /* SGT is signed '>', GT in x86 */
 39 #define BPF_JSGE        0x70    /* SGE is signed '>=', GE in x86 */
 40 #define BPF_JSLT        0xc0    /* SLT is signed, '<' */
 41 #define BPF_JSLE        0xd0    /* SLE is signed, '<=' */
 42 #define BPF_CALL        0x80    /* function call */
 43 #define BPF_EXIT        0x90    /* function return */
 44 
 45 /* Register numbers */
 46 enum {
 47         BPF_REG_0 = 0,
 48         BPF_REG_1,
 49         BPF_REG_2,
 50         BPF_REG_3,
 51         BPF_REG_4,
 52         BPF_REG_5,
 53         BPF_REG_6,
 54         BPF_REG_7,
 55         BPF_REG_8,
 56         BPF_REG_9,
 57         BPF_REG_10,
 58         __MAX_BPF_REG,
 59 };
 60 
 61 /* BPF has 10 general purpose 64-bit registers and stack frame. */
 62 #define MAX_BPF_REG     __MAX_BPF_REG
 63 
 64 struct bpf_insn {
 65         __u8    code;           /* opcode */
 66         __u8    dst_reg:4;      /* dest register */
 67         __u8    src_reg:4;      /* source register */
 68         __s16   off;            /* signed offset */
 69         __s32   imm;            /* signed immediate constant */
 70 };
 71 
 72 /* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */
 73 struct bpf_lpm_trie_key {
 74         __u32   prefixlen;      /* up to 32 for AF_INET, 128 for AF_INET6 */
 75         __u8    data[0];        /* Arbitrary size */
 76 };
 77 
 78 /* BPF syscall commands, see bpf(2) man-page for details. */
 79 enum bpf_cmd {
 80         BPF_MAP_CREATE,
 81         BPF_MAP_LOOKUP_ELEM,
 82         BPF_MAP_UPDATE_ELEM,
 83         BPF_MAP_DELETE_ELEM,
 84         BPF_MAP_GET_NEXT_KEY,
 85         BPF_PROG_LOAD,
 86         BPF_OBJ_PIN,
 87         BPF_OBJ_GET,
 88         BPF_PROG_ATTACH,
 89         BPF_PROG_DETACH,
 90         BPF_PROG_TEST_RUN,
 91         BPF_PROG_GET_NEXT_ID,
 92         BPF_MAP_GET_NEXT_ID,
 93         BPF_PROG_GET_FD_BY_ID,
 94         BPF_MAP_GET_FD_BY_ID,
 95         BPF_OBJ_GET_INFO_BY_FD,
 96         BPF_PROG_QUERY,
 97 };
 98 
 99 enum bpf_map_type {
100         BPF_MAP_TYPE_UNSPEC,
101         BPF_MAP_TYPE_HASH,
102         BPF_MAP_TYPE_ARRAY,
103         BPF_MAP_TYPE_PROG_ARRAY,
104         BPF_MAP_TYPE_PERF_EVENT_ARRAY,
105         BPF_MAP_TYPE_PERCPU_HASH,
106         BPF_MAP_TYPE_PERCPU_ARRAY,
107         BPF_MAP_TYPE_STACK_TRACE,
108         BPF_MAP_TYPE_CGROUP_ARRAY,
109         BPF_MAP_TYPE_LRU_HASH,
110         BPF_MAP_TYPE_LRU_PERCPU_HASH,
111         BPF_MAP_TYPE_LPM_TRIE,
112         BPF_MAP_TYPE_ARRAY_OF_MAPS,
113         BPF_MAP_TYPE_HASH_OF_MAPS,
114         BPF_MAP_TYPE_DEVMAP,
115         BPF_MAP_TYPE_SOCKMAP,
116         BPF_MAP_TYPE_CPUMAP,
117 };
118 
119 enum bpf_prog_type {
120         BPF_PROG_TYPE_UNSPEC,
121         BPF_PROG_TYPE_SOCKET_FILTER,
122         BPF_PROG_TYPE_KPROBE,
123         BPF_PROG_TYPE_SCHED_CLS,
124         BPF_PROG_TYPE_SCHED_ACT,
125         BPF_PROG_TYPE_TRACEPOINT,
126         BPF_PROG_TYPE_XDP,
127         BPF_PROG_TYPE_PERF_EVENT,
128         BPF_PROG_TYPE_CGROUP_SKB,
129         BPF_PROG_TYPE_CGROUP_SOCK,
130         BPF_PROG_TYPE_LWT_IN,
131         BPF_PROG_TYPE_LWT_OUT,
132         BPF_PROG_TYPE_LWT_XMIT,
133         BPF_PROG_TYPE_SOCK_OPS,
134         BPF_PROG_TYPE_SK_SKB,
135         BPF_PROG_TYPE_CGROUP_DEVICE,
136 };
137 
138 enum bpf_attach_type {
139         BPF_CGROUP_INET_INGRESS,
140         BPF_CGROUP_INET_EGRESS,
141         BPF_CGROUP_INET_SOCK_CREATE,
142         BPF_CGROUP_SOCK_OPS,
143         BPF_SK_SKB_STREAM_PARSER,
144         BPF_SK_SKB_STREAM_VERDICT,
145         BPF_CGROUP_DEVICE,
146         __MAX_BPF_ATTACH_TYPE
147 };
148 
149 #define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE
150 
151 /* cgroup-bpf attach flags used in BPF_PROG_ATTACH command
152  *
153  * NONE(default): No further bpf programs allowed in the subtree.
154  *
155  * BPF_F_ALLOW_OVERRIDE: If a sub-cgroup installs some bpf program,
156  * the program in this cgroup yields to sub-cgroup program.
157  *
158  * BPF_F_ALLOW_MULTI: If a sub-cgroup installs some bpf program,
159  * that cgroup program gets run in addition to the program in this cgroup.
160  *
161  * Only one program is allowed to be attached to a cgroup with
162  * NONE or BPF_F_ALLOW_OVERRIDE flag.
163  * Attaching another program on top of NONE or BPF_F_ALLOW_OVERRIDE will
164  * release old program and attach the new one. Attach flags has to match.
165  *
166  * Multiple programs are allowed to be attached to a cgroup with
167  * BPF_F_ALLOW_MULTI flag. They are executed in FIFO order
168  * (those that were attached first, run first)
169  * The programs of sub-cgroup are executed first, then programs of
170  * this cgroup and then programs of parent cgroup.
171  * When children program makes decision (like picking TCP CA or sock bind)
172  * parent program has a chance to override it.
173  *
174  * A cgroup with MULTI or OVERRIDE flag allows any attach flags in sub-cgroups.
175  * A cgroup with NONE doesn't allow any programs in sub-cgroups.
176  * Ex1:
177  * cgrp1 (MULTI progs A, B) ->
178  *    cgrp2 (OVERRIDE prog C) ->
179  *      cgrp3 (MULTI prog D) ->
180  *        cgrp4 (OVERRIDE prog E) ->
181  *          cgrp5 (NONE prog F)
182  * the event in cgrp5 triggers execution of F,D,A,B in that order.
183  * if prog F is detached, the execution is E,D,A,B
184  * if prog F and D are detached, the execution is E,A,B
185  * if prog F, E and D are detached, the execution is C,A,B
186  *
187  * All eligible programs are executed regardless of return code from
188  * earlier programs.
189  */
190 #define BPF_F_ALLOW_OVERRIDE    (1U << 0)
191 #define BPF_F_ALLOW_MULTI       (1U << 1)
192 
193 /* If BPF_F_STRICT_ALIGNMENT is used in BPF_PROG_LOAD command, the
194  * verifier will perform strict alignment checking as if the kernel
195  * has been built with CONFIG_EFFICIENT_UNALIGNED_ACCESS not set,
196  * and NET_IP_ALIGN defined to 2.
197  */
198 #define BPF_F_STRICT_ALIGNMENT  (1U << 0)
199 
200 /* when bpf_ldimm64->src_reg == BPF_PSEUDO_MAP_FD, bpf_ldimm64->imm == fd */
201 #define BPF_PSEUDO_MAP_FD       1
202 
203 /* when bpf_call->src_reg == BPF_PSEUDO_CALL, bpf_call->imm == pc-relative
204  * offset to another bpf function
205  */
206 #define BPF_PSEUDO_CALL         1
207 
208 /* flags for BPF_MAP_UPDATE_ELEM command */
209 #define BPF_ANY         0 /* create new element or update existing */
210 #define BPF_NOEXIST     1 /* create new element if it didn't exist */
211 #define BPF_EXIST       2 /* update existing element */
212 
213 /* flags for BPF_MAP_CREATE command */
214 #define BPF_F_NO_PREALLOC       (1U << 0)
215 /* Instead of having one common LRU list in the
216  * BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list
217  * which can scale and perform better.
218  * Note, the LRU nodes (including free nodes) cannot be moved
219  * across different LRU lists.
220  */
221 #define BPF_F_NO_COMMON_LRU     (1U << 1)
222 /* Specify numa node during map creation */
223 #define BPF_F_NUMA_NODE         (1U << 2)
224 
225 /* flags for BPF_PROG_QUERY */
226 #define BPF_F_QUERY_EFFECTIVE   (1U << 0)
227 
228 #define BPF_OBJ_NAME_LEN 16U
229 
230 /* Flags for accessing BPF object */
231 #define BPF_F_RDONLY            (1U << 3)
232 #define BPF_F_WRONLY            (1U << 4)
233 
234 union bpf_attr {
235         struct { /* anonymous struct used by BPF_MAP_CREATE command */
236                 __u32   map_type;       /* one of enum bpf_map_type */
237                 __u32   key_size;       /* size of key in bytes */
238                 __u32   value_size;     /* size of value in bytes */
239                 __u32   max_entries;    /* max number of entries in a map */
240                 __u32   map_flags;      /* BPF_MAP_CREATE related
241                                          * flags defined above.
242                                          */
243                 __u32   inner_map_fd;   /* fd pointing to the inner map */
244                 __u32   numa_node;      /* numa node (effective only if
245                                          * BPF_F_NUMA_NODE is set).
246                                          */
247                 char    map_name[BPF_OBJ_NAME_LEN];
248                 __u32   map_ifindex;    /* ifindex of netdev to create on */
249         };
250 
251         struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
252                 __u32           map_fd;
253                 __aligned_u64   key;
254                 union {
255                         __aligned_u64 value;
256                         __aligned_u64 next_key;
257                 };
258                 __u64           flags;
259         };
260 
261         struct { /* anonymous struct used by BPF_PROG_LOAD command */
262                 __u32           prog_type;      /* one of enum bpf_prog_type */
263                 __u32           insn_cnt;
264                 __aligned_u64   insns;
265                 __aligned_u64   license;
266                 __u32           log_level;      /* verbosity level of verifier */
267                 __u32           log_size;       /* size of user buffer */
268                 __aligned_u64   log_buf;        /* user supplied buffer */
269                 __u32           kern_version;   /* checked when prog_type=kprobe */
270                 __u32           prog_flags;
271                 char            prog_name[BPF_OBJ_NAME_LEN];
272                 __u32           prog_ifindex;   /* ifindex of netdev to prep for */
273         };
274 
275         struct { /* anonymous struct used by BPF_OBJ_* commands */
276                 __aligned_u64   pathname;
277                 __u32           bpf_fd;
278                 __u32           file_flags;
279         };
280 
281         struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */
282                 __u32           target_fd;      /* container object to attach to */
283                 __u32           attach_bpf_fd;  /* eBPF program to attach */
284                 __u32           attach_type;
285                 __u32           attach_flags;
286         };
287 
288         struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */
289                 __u32           prog_fd;
290                 __u32           retval;
291                 __u32           data_size_in;
292                 __u32           data_size_out;
293                 __aligned_u64   data_in;
294                 __aligned_u64   data_out;
295                 __u32           repeat;
296                 __u32           duration;
297         } test;
298 
299         struct { /* anonymous struct used by BPF_*_GET_*_ID */
300                 union {
301                         __u32           start_id;
302                         __u32           prog_id;
303                         __u32           map_id;
304                 };
305                 __u32           next_id;
306                 __u32           open_flags;
307         };
308 
309         struct { /* anonymous struct used by BPF_OBJ_GET_INFO_BY_FD */
310                 __u32           bpf_fd;
311                 __u32           info_len;
312                 __aligned_u64   info;
313         } info;
314 
315         struct { /* anonymous struct used by BPF_PROG_QUERY command */
316                 __u32           target_fd;      /* container object to query */
317                 __u32           attach_type;
318                 __u32           query_flags;
319                 __u32           attach_flags;
320                 __aligned_u64   prog_ids;
321                 __u32           prog_cnt;
322         } query;
323 } __attribute__((aligned(8)));
324 
325 /* BPF helper function descriptions:
326  *
327  * void *bpf_map_lookup_elem(&map, &key)
328  *     Return: Map value or NULL
329  *
330  * int bpf_map_update_elem(&map, &key, &value, flags)
331  *     Return: 0 on success or negative error
332  *
333  * int bpf_map_delete_elem(&map, &key)
334  *     Return: 0 on success or negative error
335  *
336  * int bpf_probe_read(void *dst, int size, void *src)
337  *     Return: 0 on success or negative error
338  *
339  * u64 bpf_ktime_get_ns(void)
340  *     Return: current ktime
341  *
342  * int bpf_trace_printk(const char *fmt, int fmt_size, ...)
343  *     Return: length of buffer written or negative error
344  *
345  * u32 bpf_prandom_u32(void)
346  *     Return: random value
347  *
348  * u32 bpf_raw_smp_processor_id(void)
349  *     Return: SMP processor ID
350  *
351  * int bpf_skb_store_bytes(skb, offset, from, len, flags)
352  *     store bytes into packet
353  *     @skb: pointer to skb
354  *     @offset: offset within packet from skb->mac_header
355  *     @from: pointer where to copy bytes from
356  *     @len: number of bytes to store into packet
357  *     @flags: bit 0 - if true, recompute skb->csum
358  *             other bits - reserved
359  *     Return: 0 on success or negative error
360  *
361  * int bpf_l3_csum_replace(skb, offset, from, to, flags)
362  *     recompute IP checksum
363  *     @skb: pointer to skb
364  *     @offset: offset within packet where IP checksum is located
365  *     @from: old value of header field
366  *     @to: new value of header field
367  *     @flags: bits 0-3 - size of header field
368  *             other bits - reserved
369  *     Return: 0 on success or negative error
370  *
371  * int bpf_l4_csum_replace(skb, offset, from, to, flags)
372  *     recompute TCP/UDP checksum
373  *     @skb: pointer to skb
374  *     @offset: offset within packet where TCP/UDP checksum is located
375  *     @from: old value of header field
376  *     @to: new value of header field
377  *     @flags: bits 0-3 - size of header field
378  *             bit 4 - is pseudo header
379  *             other bits - reserved
380  *     Return: 0 on success or negative error
381  *
382  * int bpf_tail_call(ctx, prog_array_map, index)
383  *     jump into another BPF program
384  *     @ctx: context pointer passed to next program
385  *     @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY
386  *     @index: 32-bit index inside array that selects specific program to run
387  *     Return: 0 on success or negative error
388  *
389  * int bpf_clone_redirect(skb, ifindex, flags)
390  *     redirect to another netdev
391  *     @skb: pointer to skb
392  *     @ifindex: ifindex of the net device
393  *     @flags: bit 0 - if set, redirect to ingress instead of egress
394  *             other bits - reserved
395  *     Return: 0 on success or negative error
396  *
397  * u64 bpf_get_current_pid_tgid(void)
398  *     Return: current->tgid << 32 | current->pid
399  *
400  * u64 bpf_get_current_uid_gid(void)
401  *     Return: current_gid << 32 | current_uid
402  *
403  * int bpf_get_current_comm(char *buf, int size_of_buf)
404  *     stores current->comm into buf
405  *     Return: 0 on success or negative error
406  *
407  * u32 bpf_get_cgroup_classid(skb)
408  *     retrieve a proc's classid
409  *     @skb: pointer to skb
410  *     Return: classid if != 0
411  *
412  * int bpf_skb_vlan_push(skb, vlan_proto, vlan_tci)
413  *     Return: 0 on success or negative error
414  *
415  * int bpf_skb_vlan_pop(skb)
416  *     Return: 0 on success or negative error
417  *
418  * int bpf_skb_get_tunnel_key(skb, key, size, flags)
419  * int bpf_skb_set_tunnel_key(skb, key, size, flags)
420  *     retrieve or populate tunnel metadata
421  *     @skb: pointer to skb
422  *     @key: pointer to 'struct bpf_tunnel_key'
423  *     @size: size of 'struct bpf_tunnel_key'
424  *     @flags: room for future extensions
425  *     Return: 0 on success or negative error
426  *
427  * u64 bpf_perf_event_read(map, flags)
428  *     read perf event counter value
429  *     @map: pointer to perf_event_array map
430  *     @flags: index of event in the map or bitmask flags
431  *     Return: value of perf event counter read or error code
432  *
433  * int bpf_redirect(ifindex, flags)
434  *     redirect to another netdev
435  *     @ifindex: ifindex of the net device
436  *     @flags:
437  *        cls_bpf:
438  *          bit 0 - if set, redirect to ingress instead of egress
439  *          other bits - reserved
440  *        xdp_bpf:
441  *          all bits - reserved
442  *     Return: cls_bpf: TC_ACT_REDIRECT on success or TC_ACT_SHOT on error
443  *             xdp_bfp: XDP_REDIRECT on success or XDP_ABORT on error
444  * int bpf_redirect_map(map, key, flags)
445  *     redirect to endpoint in map
446  *     @map: pointer to dev map
447  *     @key: index in map to lookup
448  *     @flags: --
449  *     Return: XDP_REDIRECT on success or XDP_ABORT on error
450  *
451  * u32 bpf_get_route_realm(skb)
452  *     retrieve a dst's tclassid
453  *     @skb: pointer to skb
454  *     Return: realm if != 0
455  *
456  * int bpf_perf_event_output(ctx, map, flags, data, size)
457  *     output perf raw sample
458  *     @ctx: struct pt_regs*
459  *     @map: pointer to perf_event_array map
460  *     @flags: index of event in the map or bitmask flags
461  *     @data: data on stack to be output as raw data
462  *     @size: size of data
463  *     Return: 0 on success or negative error
464  *
465  * int bpf_get_stackid(ctx, map, flags)
466  *     walk user or kernel stack and return id
467  *     @ctx: struct pt_regs*
468  *     @map: pointer to stack_trace map
469  *     @flags: bits 0-7 - numer of stack frames to skip
470  *             bit 8 - collect user stack instead of kernel
471  *             bit 9 - compare stacks by hash only
472  *             bit 10 - if two different stacks hash into the same stackid
473  *                      discard old
474  *             other bits - reserved
475  *     Return: >= 0 stackid on success or negative error
476  *
477  * s64 bpf_csum_diff(from, from_size, to, to_size, seed)
478  *     calculate csum diff
479  *     @from: raw from buffer
480  *     @from_size: length of from buffer
481  *     @to: raw to buffer
482  *     @to_size: length of to buffer
483  *     @seed: optional seed
484  *     Return: csum result or negative error code
485  *
486  * int bpf_skb_get_tunnel_opt(skb, opt, size)
487  *     retrieve tunnel options metadata
488  *     @skb: pointer to skb
489  *     @opt: pointer to raw tunnel option data
490  *     @size: size of @opt
491  *     Return: option size
492  *
493  * int bpf_skb_set_tunnel_opt(skb, opt, size)
494  *     populate tunnel options metadata
495  *     @skb: pointer to skb
496  *     @opt: pointer to raw tunnel option data
497  *     @size: size of @opt
498  *     Return: 0 on success or negative error
499  *
500  * int bpf_skb_change_proto(skb, proto, flags)
501  *     Change protocol of the skb. Currently supported is v4 -> v6,
502  *     v6 -> v4 transitions. The helper will also resize the skb. eBPF
503  *     program is expected to fill the new headers via skb_store_bytes
504  *     and lX_csum_replace.
505  *     @skb: pointer to skb
506  *     @proto: new skb->protocol type
507  *     @flags: reserved
508  *     Return: 0 on success or negative error
509  *
510  * int bpf_skb_change_type(skb, type)
511  *     Change packet type of skb.
512  *     @skb: pointer to skb
513  *     @type: new skb->pkt_type type
514  *     Return: 0 on success or negative error
515  *
516  * int bpf_skb_under_cgroup(skb, map, index)
517  *     Check cgroup2 membership of skb
518  *     @skb: pointer to skb
519  *     @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type
520  *     @index: index of the cgroup in the bpf_map
521  *     Return:
522  *       == 0 skb failed the cgroup2 descendant test
523  *       == 1 skb succeeded the cgroup2 descendant test
524  *        < 0 error
525  *
526  * u32 bpf_get_hash_recalc(skb)
527  *     Retrieve and possibly recalculate skb->hash.
528  *     @skb: pointer to skb
529  *     Return: hash
530  *
531  * u64 bpf_get_current_task(void)
532  *     Returns current task_struct
533  *     Return: current
534  *
535  * int bpf_probe_write_user(void *dst, void *src, int len)
536  *     safely attempt to write to a location
537  *     @dst: destination address in userspace
538  *     @src: source address on stack
539  *     @len: number of bytes to copy
540  *     Return: 0 on success or negative error
541  *
542  * int bpf_current_task_under_cgroup(map, index)
543  *     Check cgroup2 membership of current task
544  *     @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type
545  *     @index: index of the cgroup in the bpf_map
546  *     Return:
547  *       == 0 current failed the cgroup2 descendant test
548  *       == 1 current succeeded the cgroup2 descendant test
549  *        < 0 error
550  *
551  * int bpf_skb_change_tail(skb, len, flags)
552  *     The helper will resize the skb to the given new size, to be used f.e.
553  *     with control messages.
554  *     @skb: pointer to skb
555  *     @len: new skb length
556  *     @flags: reserved
557  *     Return: 0 on success or negative error
558  *
559  * int bpf_skb_pull_data(skb, len)
560  *     The helper will pull in non-linear data in case the skb is non-linear
561  *     and not all of len are part of the linear section. Only needed for
562  *     read/write with direct packet access.
563  *     @skb: pointer to skb
564  *     @len: len to make read/writeable
565  *     Return: 0 on success or negative error
566  *
567  * s64 bpf_csum_update(skb, csum)
568  *     Adds csum into skb->csum in case of CHECKSUM_COMPLETE.
569  *     @skb: pointer to skb
570  *     @csum: csum to add
571  *     Return: csum on success or negative error
572  *
573  * void bpf_set_hash_invalid(skb)
574  *     Invalidate current skb->hash.
575  *     @skb: pointer to skb
576  *
577  * int bpf_get_numa_node_id()
578  *     Return: Id of current NUMA node.
579  *
580  * int bpf_skb_change_head()
581  *     Grows headroom of skb and adjusts MAC header offset accordingly.
582  *     Will extends/reallocae as required automatically.
583  *     May change skb data pointer and will thus invalidate any check
584  *     performed for direct packet access.
585  *     @skb: pointer to skb
586  *     @len: length of header to be pushed in front
587  *     @flags: Flags (unused for now)
588  *     Return: 0 on success or negative error
589  *
590  * int bpf_xdp_adjust_head(xdp_md, delta)
591  *     Adjust the xdp_md.data by delta
592  *     @xdp_md: pointer to xdp_md
593  *     @delta: An positive/negative integer to be added to xdp_md.data
594  *     Return: 0 on success or negative on error
595  *
596  * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr)
597  *     Copy a NUL terminated string from unsafe address. In case the string
598  *     length is smaller than size, the target is not padded with further NUL
599  *     bytes. In case the string length is larger than size, just count-1
600  *     bytes are copied and the last byte is set to NUL.
601  *     @dst: destination address
602  *     @size: maximum number of bytes to copy, including the trailing NUL
603  *     @unsafe_ptr: unsafe address
604  *     Return:
605  *       > 0 length of the string including the trailing NUL on success
606  *       < 0 error
607  *
608  * u64 bpf_get_socket_cookie(skb)
609  *     Get the cookie for the socket stored inside sk_buff.
610  *     @skb: pointer to skb
611  *     Return: 8 Bytes non-decreasing number on success or 0 if the socket
612  *     field is missing inside sk_buff
613  *
614  * u32 bpf_get_socket_uid(skb)
615  *     Get the owner uid of the socket stored inside sk_buff.
616  *     @skb: pointer to skb
617  *     Return: uid of the socket owner on success or overflowuid if failed.
618  *
619  * u32 bpf_set_hash(skb, hash)
620  *     Set full skb->hash.
621  *     @skb: pointer to skb
622  *     @hash: hash to set
623  *
624  * int bpf_setsockopt(bpf_socket, level, optname, optval, optlen)
625  *     Calls setsockopt. Not all opts are available, only those with
626  *     integer optvals plus TCP_CONGESTION.
627  *     Supported levels: SOL_SOCKET and IPPROTO_TCP
628  *     @bpf_socket: pointer to bpf_socket
629  *     @level: SOL_SOCKET or IPPROTO_TCP
630  *     @optname: option name
631  *     @optval: pointer to option value
632  *     @optlen: length of optval in bytes
633  *     Return: 0 or negative error
634  *
635  * int bpf_getsockopt(bpf_socket, level, optname, optval, optlen)
636  *     Calls getsockopt. Not all opts are available.
637  *     Supported levels: IPPROTO_TCP
638  *     @bpf_socket: pointer to bpf_socket
639  *     @level: IPPROTO_TCP
640  *     @optname: option name
641  *     @optval: pointer to option value
642  *     @optlen: length of optval in bytes
643  *     Return: 0 or negative error
644  *
645  * int bpf_sock_ops_cb_flags_set(bpf_sock_ops, flags)
646  *     Set callback flags for sock_ops
647  *     @bpf_sock_ops: pointer to bpf_sock_ops_kern struct
648  *     @flags: flags value
649  *     Return: 0 for no error
650  *             -EINVAL if there is no full tcp socket
651  *             bits in flags that are not supported by current kernel
652  *
653  * int bpf_skb_adjust_room(skb, len_diff, mode, flags)
654  *     Grow or shrink room in sk_buff.
655  *     @skb: pointer to skb
656  *     @len_diff: (signed) amount of room to grow/shrink
657  *     @mode: operation mode (enum bpf_adj_room_mode)
658  *     @flags: reserved for future use
659  *     Return: 0 on success or negative error code
660  *
661  * int bpf_sk_redirect_map(map, key, flags)
662  *     Redirect skb to a sock in map using key as a lookup key for the
663  *     sock in map.
664  *     @map: pointer to sockmap
665  *     @key: key to lookup sock in map
666  *     @flags: reserved for future use
667  *     Return: SK_PASS
668  *
669  * int bpf_sock_map_update(skops, map, key, flags)
670  *      @skops: pointer to bpf_sock_ops
671  *      @map: pointer to sockmap to update
672  *      @key: key to insert/update sock in map
673  *      @flags: same flags as map update elem
674  *
675  * int bpf_xdp_adjust_meta(xdp_md, delta)
676  *     Adjust the xdp_md.data_meta by delta
677  *     @xdp_md: pointer to xdp_md
678  *     @delta: An positive/negative integer to be added to xdp_md.data_meta
679  *     Return: 0 on success or negative on error
680  *
681  * int bpf_perf_event_read_value(map, flags, buf, buf_size)
682  *     read perf event counter value and perf event enabled/running time
683  *     @map: pointer to perf_event_array map
684  *     @flags: index of event in the map or bitmask flags
685  *     @buf: buf to fill
686  *     @buf_size: size of the buf
687  *     Return: 0 on success or negative error code
688  *
689  * int bpf_perf_prog_read_value(ctx, buf, buf_size)
690  *     read perf prog attached perf event counter and enabled/running time
691  *     @ctx: pointer to ctx
692  *     @buf: buf to fill
693  *     @buf_size: size of the buf
694  *     Return : 0 on success or negative error code
695  *
696  * int bpf_override_return(pt_regs, rc)
697  *      @pt_regs: pointer to struct pt_regs
698  *      @rc: the return value to set
699  */
700 #define __BPF_FUNC_MAPPER(FN)           \
701         FN(unspec),                     \
702         FN(map_lookup_elem),            \
703         FN(map_update_elem),            \
704         FN(map_delete_elem),            \
705         FN(probe_read),                 \
706         FN(ktime_get_ns),               \
707         FN(trace_printk),               \
708         FN(get_prandom_u32),            \
709         FN(get_smp_processor_id),       \
710         FN(skb_store_bytes),            \
711         FN(l3_csum_replace),            \
712         FN(l4_csum_replace),            \
713         FN(tail_call),                  \
714         FN(clone_redirect),             \
715         FN(get_current_pid_tgid),       \
716         FN(get_current_uid_gid),        \
717         FN(get_current_comm),           \
718         FN(get_cgroup_classid),         \
719         FN(skb_vlan_push),              \
720         FN(skb_vlan_pop),               \
721         FN(skb_get_tunnel_key),         \
722         FN(skb_set_tunnel_key),         \
723         FN(perf_event_read),            \
724         FN(redirect),                   \
725         FN(get_route_realm),            \
726         FN(perf_event_output),          \
727         FN(skb_load_bytes),             \
728         FN(get_stackid),                \
729         FN(csum_diff),                  \
730         FN(skb_get_tunnel_opt),         \
731         FN(skb_set_tunnel_opt),         \
732         FN(skb_change_proto),           \
733         FN(skb_change_type),            \
734         FN(skb_under_cgroup),           \
735         FN(get_hash_recalc),            \
736         FN(get_current_task),           \
737         FN(probe_write_user),           \
738         FN(current_task_under_cgroup),  \
739         FN(skb_change_tail),            \
740         FN(skb_pull_data),              \
741         FN(csum_update),                \
742         FN(set_hash_invalid),           \
743         FN(get_numa_node_id),           \
744         FN(skb_change_head),            \
745         FN(xdp_adjust_head),            \
746         FN(probe_read_str),             \
747         FN(get_socket_cookie),          \
748         FN(get_socket_uid),             \
749         FN(set_hash),                   \
750         FN(setsockopt),                 \
751         FN(skb_adjust_room),            \
752         FN(redirect_map),               \
753         FN(sk_redirect_map),            \
754         FN(sock_map_update),            \
755         FN(xdp_adjust_meta),            \
756         FN(perf_event_read_value),      \
757         FN(perf_prog_read_value),       \
758         FN(getsockopt),                 \
759         FN(override_return),            \
760         FN(sock_ops_cb_flags_set),
761 
762 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
763  * function eBPF program intends to call
764  */
765 #define __BPF_ENUM_FN(x) BPF_FUNC_ ## x
766 enum bpf_func_id {
767         __BPF_FUNC_MAPPER(__BPF_ENUM_FN)
768         __BPF_FUNC_MAX_ID,
769 };
770 #undef __BPF_ENUM_FN
771 
772 /* All flags used by eBPF helper functions, placed here. */
773 
774 /* BPF_FUNC_skb_store_bytes flags. */
775 #define BPF_F_RECOMPUTE_CSUM            (1ULL << 0)
776 #define BPF_F_INVALIDATE_HASH           (1ULL << 1)
777 
778 /* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags.
779  * First 4 bits are for passing the header field size.
780  */
781 #define BPF_F_HDR_FIELD_MASK            0xfULL
782 
783 /* BPF_FUNC_l4_csum_replace flags. */
784 #define BPF_F_PSEUDO_HDR                (1ULL << 4)
785 #define BPF_F_MARK_MANGLED_0            (1ULL << 5)
786 #define BPF_F_MARK_ENFORCE              (1ULL << 6)
787 
788 /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */
789 #define BPF_F_INGRESS                   (1ULL << 0)
790 
791 /* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */
792 #define BPF_F_TUNINFO_IPV6              (1ULL << 0)
793 
794 /* BPF_FUNC_get_stackid flags. */
795 #define BPF_F_SKIP_FIELD_MASK           0xffULL
796 #define BPF_F_USER_STACK                (1ULL << 8)
797 #define BPF_F_FAST_STACK_CMP            (1ULL << 9)
798 #define BPF_F_REUSE_STACKID             (1ULL << 10)
799 
800 /* BPF_FUNC_skb_set_tunnel_key flags. */
801 #define BPF_F_ZERO_CSUM_TX              (1ULL << 1)
802 #define BPF_F_DONT_FRAGMENT             (1ULL << 2)
803 
804 /* BPF_FUNC_perf_event_output, BPF_FUNC_perf_event_read and
805  * BPF_FUNC_perf_event_read_value flags.
806  */
807 #define BPF_F_INDEX_MASK                0xffffffffULL
808 #define BPF_F_CURRENT_CPU               BPF_F_INDEX_MASK
809 /* BPF_FUNC_perf_event_output for sk_buff input context. */
810 #define BPF_F_CTXLEN_MASK               (0xfffffULL << 32)
811 
812 /* Mode for BPF_FUNC_skb_adjust_room helper. */
813 enum bpf_adj_room_mode {
814         BPF_ADJ_ROOM_NET,
815 };
816 
817 /* user accessible mirror of in-kernel sk_buff.
818  * new fields can only be added to the end of this structure
819  */
820 struct __sk_buff {
821         __u32 len;
822         __u32 pkt_type;
823         __u32 mark;
824         __u32 queue_mapping;
825         __u32 protocol;
826         __u32 vlan_present;
827         __u32 vlan_tci;
828         __u32 vlan_proto;
829         __u32 priority;
830         __u32 ingress_ifindex;
831         __u32 ifindex;
832         __u32 tc_index;
833         __u32 cb[5];
834         __u32 hash;
835         __u32 tc_classid;
836         __u32 data;
837         __u32 data_end;
838         __u32 napi_id;
839 
840         /* Accessed by BPF_PROG_TYPE_sk_skb types from here to ... */
841         __u32 family;
842         __u32 remote_ip4;       /* Stored in network byte order */
843         __u32 local_ip4;        /* Stored in network byte order */
844         __u32 remote_ip6[4];    /* Stored in network byte order */
845         __u32 local_ip6[4];     /* Stored in network byte order */
846         __u32 remote_port;      /* Stored in network byte order */
847         __u32 local_port;       /* stored in host byte order */
848         /* ... here. */
849 
850         __u32 data_meta;
851 };
852 
853 struct bpf_tunnel_key {
854         __u32 tunnel_id;
855         union {
856                 __u32 remote_ipv4;
857                 __u32 remote_ipv6[4];
858         };
859         __u8 tunnel_tos;
860         __u8 tunnel_ttl;
861         __u16 tunnel_ext;
862         __u32 tunnel_label;
863 };
864 
865 /* Generic BPF return codes which all BPF program types may support.
866  * The values are binary compatible with their TC_ACT_* counter-part to
867  * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT
868  * programs.
869  *
870  * XDP is handled seprately, see XDP_*.
871  */
872 enum bpf_ret_code {
873         BPF_OK = 0,
874         /* 1 reserved */
875         BPF_DROP = 2,
876         /* 3-6 reserved */
877         BPF_REDIRECT = 7,
878         /* >127 are reserved for prog type specific return codes */
879 };
880 
881 struct bpf_sock {
882         __u32 bound_dev_if;
883         __u32 family;
884         __u32 type;
885         __u32 protocol;
886         __u32 mark;
887         __u32 priority;
888 };
889 
890 #define XDP_PACKET_HEADROOM 256
891 
892 /* User return codes for XDP prog type.
893  * A valid XDP program must return one of these defined values. All other
894  * return codes are reserved for future use. Unknown return codes will
895  * result in packet drops and a warning via bpf_warn_invalid_xdp_action().
896  */
897 enum xdp_action {
898         XDP_ABORTED = 0,
899         XDP_DROP,
900         XDP_PASS,
901         XDP_TX,
902         XDP_REDIRECT,
903 };
904 
905 /* user accessible metadata for XDP packet hook
906  * new fields must be added to the end of this structure
907  */
908 struct xdp_md {
909         __u32 data;
910         __u32 data_end;
911         __u32 data_meta;
912         /* Below access go through struct xdp_rxq_info */
913         __u32 ingress_ifindex; /* rxq->dev->ifindex */
914         __u32 rx_queue_index;  /* rxq->queue_index  */
915 };
916 
917 enum sk_action {
918         SK_DROP = 0,
919         SK_PASS,
920 };
921 
922 #define BPF_TAG_SIZE    8
923 
924 struct bpf_prog_info {
925         __u32 type;
926         __u32 id;
927         __u8  tag[BPF_TAG_SIZE];
928         __u32 jited_prog_len;
929         __u32 xlated_prog_len;
930         __aligned_u64 jited_prog_insns;
931         __aligned_u64 xlated_prog_insns;
932         __u64 load_time;        /* ns since boottime */
933         __u32 created_by_uid;
934         __u32 nr_map_ids;
935         __aligned_u64 map_ids;
936         char name[BPF_OBJ_NAME_LEN];
937         __u32 ifindex;
938         __u64 netns_dev;
939         __u64 netns_ino;
940 } __attribute__((aligned(8)));
941 
942 struct bpf_map_info {
943         __u32 type;
944         __u32 id;
945         __u32 key_size;
946         __u32 value_size;
947         __u32 max_entries;
948         __u32 map_flags;
949         char  name[BPF_OBJ_NAME_LEN];
950         __u32 ifindex;
951         __u64 netns_dev;
952         __u64 netns_ino;
953 } __attribute__((aligned(8)));
954 
955 /* User bpf_sock_ops struct to access socket values and specify request ops
956  * and their replies.
957  * Some of this fields are in network (bigendian) byte order and may need
958  * to be converted before use (bpf_ntohl() defined in samples/bpf/bpf_endian.h).
959  * New fields can only be added at the end of this structure
960  */
961 struct bpf_sock_ops {
962         __u32 op;
963         union {
964                 __u32 args[4];          /* Optionally passed to bpf program */
965                 __u32 reply;            /* Returned by bpf program          */
966                 __u32 replylong[4];     /* Optionally returned by bpf prog  */
967         };
968         __u32 family;
969         __u32 remote_ip4;       /* Stored in network byte order */
970         __u32 local_ip4;        /* Stored in network byte order */
971         __u32 remote_ip6[4];    /* Stored in network byte order */
972         __u32 local_ip6[4];     /* Stored in network byte order */
973         __u32 remote_port;      /* Stored in network byte order */
974         __u32 local_port;       /* stored in host byte order */
975         __u32 is_fullsock;      /* Some TCP fields are only valid if
976                                  * there is a full socket. If not, the
977                                  * fields read as zero.
978                                  */
979         __u32 snd_cwnd;
980         __u32 srtt_us;          /* Averaged RTT << 3 in usecs */
981         __u32 bpf_sock_ops_cb_flags; /* flags defined in uapi/linux/tcp.h */
982         __u32 state;
983         __u32 rtt_min;
984         __u32 snd_ssthresh;
985         __u32 rcv_nxt;
986         __u32 snd_nxt;
987         __u32 snd_una;
988         __u32 mss_cache;
989         __u32 ecn_flags;
990         __u32 rate_delivered;
991         __u32 rate_interval_us;
992         __u32 packets_out;
993         __u32 retrans_out;
994         __u32 total_retrans;
995         __u32 segs_in;
996         __u32 data_segs_in;
997         __u32 segs_out;
998         __u32 data_segs_out;
999         __u32 lost_out;
1000         __u32 sacked_out;
1001         __u32 sk_txhash;
1002         __u64 bytes_received;
1003         __u64 bytes_acked;
1004 };
1005 
1006 /* Definitions for bpf_sock_ops_cb_flags */
1007 #define BPF_SOCK_OPS_RTO_CB_FLAG        (1<<0)
1008 #define BPF_SOCK_OPS_RETRANS_CB_FLAG    (1<<1)
1009 #define BPF_SOCK_OPS_STATE_CB_FLAG      (1<<2)
1010 #define BPF_SOCK_OPS_ALL_CB_FLAGS       0x7             /* Mask of all currently
1011                                                          * supported cb flags
1012                                                          */
1013 
1014 /* List of known BPF sock_ops operators.
1015  * New entries can only be added at the end
1016  */
1017 enum {
1018         BPF_SOCK_OPS_VOID,
1019         BPF_SOCK_OPS_TIMEOUT_INIT,      /* Should return SYN-RTO value to use or
1020                                          * -1 if default value should be used
1021                                          */
1022         BPF_SOCK_OPS_RWND_INIT,         /* Should return initial advertized
1023                                          * window (in packets) or -1 if default
1024                                          * value should be used
1025                                          */
1026         BPF_SOCK_OPS_TCP_CONNECT_CB,    /* Calls BPF program right before an
1027                                          * active connection is initialized
1028                                          */
1029         BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB,     /* Calls BPF program when an
1030                                                  * active connection is
1031                                                  * established
1032                                                  */
1033         BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB,    /* Calls BPF program when a
1034                                                  * passive connection is
1035                                                  * established
1036                                                  */
1037         BPF_SOCK_OPS_NEEDS_ECN,         /* If connection's congestion control
1038                                          * needs ECN
1039                                          */
1040         BPF_SOCK_OPS_BASE_RTT,          /* Get base RTT. The correct value is
1041                                          * based on the path and may be
1042                                          * dependent on the congestion control
1043                                          * algorithm. In general it indicates
1044                                          * a congestion threshold. RTTs above
1045                                          * this indicate congestion
1046                                          */
1047         BPF_SOCK_OPS_RTO_CB,            /* Called when an RTO has triggered.
1048                                          * Arg1: value of icsk_retransmits
1049                                          * Arg2: value of icsk_rto
1050                                          * Arg3: whether RTO has expired
1051                                          */
1052         BPF_SOCK_OPS_RETRANS_CB,        /* Called when skb is retransmitted.
1053                                          * Arg1: sequence number of 1st byte
1054                                          * Arg2: # segments
1055                                          * Arg3: return value of
1056                                          *       tcp_transmit_skb (0 => success)
1057                                          */
1058         BPF_SOCK_OPS_STATE_CB,          /* Called when TCP changes state.
1059                                          * Arg1: old_state
1060                                          * Arg2: new_state
1061                                          */
1062 };
1063 
1064 /* List of TCP states. There is a build check in net/ipv4/tcp.c to detect
1065  * changes between the TCP and BPF versions. Ideally this should never happen.
1066  * If it does, we need to add code to convert them before calling
1067  * the BPF sock_ops function.
1068  */
1069 enum {
1070         BPF_TCP_ESTABLISHED = 1,
1071         BPF_TCP_SYN_SENT,
1072         BPF_TCP_SYN_RECV,
1073         BPF_TCP_FIN_WAIT1,
1074         BPF_TCP_FIN_WAIT2,
1075         BPF_TCP_TIME_WAIT,
1076         BPF_TCP_CLOSE,
1077         BPF_TCP_CLOSE_WAIT,
1078         BPF_TCP_LAST_ACK,
1079         BPF_TCP_LISTEN,
1080         BPF_TCP_CLOSING,        /* Now a valid state */
1081         BPF_TCP_NEW_SYN_RECV,
1082 
1083         BPF_TCP_MAX_STATES      /* Leave at the end! */
1084 };
1085 
1086 #define TCP_BPF_IW              1001    /* Set TCP initial congestion window */
1087 #define TCP_BPF_SNDCWND_CLAMP   1002    /* Set sndcwnd_clamp */
1088 
1089 struct bpf_perf_event_value {
1090         __u64 counter;
1091         __u64 enabled;
1092         __u64 running;
1093 };
1094 
1095 #define BPF_DEVCG_ACC_MKNOD     (1ULL << 0)
1096 #define BPF_DEVCG_ACC_READ      (1ULL << 1)
1097 #define BPF_DEVCG_ACC_WRITE     (1ULL << 2)
1098 
1099 #define BPF_DEVCG_DEV_BLOCK     (1ULL << 0)
1100 #define BPF_DEVCG_DEV_CHAR      (1ULL << 1)
1101 
1102 struct bpf_cgroup_dev_ctx {
1103         /* access_type encoded as (BPF_DEVCG_ACC_* << 16) | BPF_DEVCG_DEV_* */
1104         __u32 access_type;
1105         __u32 major;
1106         __u32 minor;
1107 };
1108 
1109 #endif /* _UAPI__LINUX_BPF_H__ */
1110 

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