1 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
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.
7 #ifndef _UAPI__LINUX_BPF_H__
8 #define _UAPI__LINUX_BPF_H__
10 #include <linux/types.h>
11 #include <linux/bpf_common.h>
13 /* Extended instruction set based on top of classic BPF */
15 /* instruction classes */
16 #define BPF_ALU64 0x07 /* alu mode in double word width */
19 #define BPF_DW 0x18 /* double word */
20 #define BPF_XADD 0xc0 /* exclusive add */
23 #define BPF_MOV 0xb0 /* mov reg to reg */
24 #define BPF_ARSH 0xc0 /* sign extending arithmetic shift right */
26 /* change endianness of a register */
27 #define BPF_END 0xd0 /* flags for endianness conversion: */
28 #define BPF_TO_LE 0x00 /* convert to little-endian */
29 #define BPF_TO_BE 0x08 /* convert to big-endian */
30 #define BPF_FROM_LE BPF_TO_LE
31 #define BPF_FROM_BE BPF_TO_BE
34 #define BPF_JNE 0x50 /* jump != */
35 #define BPF_JLT 0xa0 /* LT is unsigned, '<' */
36 #define BPF_JLE 0xb0 /* LE is unsigned, '<=' */
37 #define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */
38 #define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */
39 #define BPF_JSLT 0xc0 /* SLT is signed, '<' */
40 #define BPF_JSLE 0xd0 /* SLE is signed, '<=' */
41 #define BPF_CALL 0x80 /* function call */
42 #define BPF_EXIT 0x90 /* function return */
44 /* Register numbers */
60 /* BPF has 10 general purpose 64-bit registers and stack frame. */
61 #define MAX_BPF_REG __MAX_BPF_REG
64 __u8 code; /* opcode */
65 __u8 dst_reg:4; /* dest register */
66 __u8 src_reg:4; /* source register */
67 __s16 off; /* signed offset */
68 __s32 imm; /* signed immediate constant */
71 /* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */
72 struct bpf_lpm_trie_key {
73 __u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */
74 __u8 data[0]; /* Arbitrary size */
77 /* BPF syscall commands, see bpf(2) man-page for details. */
92 BPF_PROG_GET_FD_BY_ID,
94 BPF_OBJ_GET_INFO_BY_FD,
101 BPF_MAP_TYPE_PROG_ARRAY,
102 BPF_MAP_TYPE_PERF_EVENT_ARRAY,
103 BPF_MAP_TYPE_PERCPU_HASH,
104 BPF_MAP_TYPE_PERCPU_ARRAY,
105 BPF_MAP_TYPE_STACK_TRACE,
106 BPF_MAP_TYPE_CGROUP_ARRAY,
107 BPF_MAP_TYPE_LRU_HASH,
108 BPF_MAP_TYPE_LRU_PERCPU_HASH,
109 BPF_MAP_TYPE_LPM_TRIE,
110 BPF_MAP_TYPE_ARRAY_OF_MAPS,
111 BPF_MAP_TYPE_HASH_OF_MAPS,
116 BPF_PROG_TYPE_UNSPEC,
117 BPF_PROG_TYPE_SOCKET_FILTER,
118 BPF_PROG_TYPE_KPROBE,
119 BPF_PROG_TYPE_SCHED_CLS,
120 BPF_PROG_TYPE_SCHED_ACT,
121 BPF_PROG_TYPE_TRACEPOINT,
123 BPF_PROG_TYPE_PERF_EVENT,
124 BPF_PROG_TYPE_CGROUP_SKB,
125 BPF_PROG_TYPE_CGROUP_SOCK,
126 BPF_PROG_TYPE_LWT_IN,
127 BPF_PROG_TYPE_LWT_OUT,
128 BPF_PROG_TYPE_LWT_XMIT,
129 BPF_PROG_TYPE_SOCK_OPS,
132 enum bpf_attach_type {
133 BPF_CGROUP_INET_INGRESS,
134 BPF_CGROUP_INET_EGRESS,
135 BPF_CGROUP_INET_SOCK_CREATE,
137 __MAX_BPF_ATTACH_TYPE
140 #define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE
142 /* If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command
143 * to the given target_fd cgroup the descendent cgroup will be able to
144 * override effective bpf program that was inherited from this cgroup
146 #define BPF_F_ALLOW_OVERRIDE (1U << 0)
148 /* If BPF_F_STRICT_ALIGNMENT is used in BPF_PROG_LOAD command, the
149 * verifier will perform strict alignment checking as if the kernel
150 * has been built with CONFIG_EFFICIENT_UNALIGNED_ACCESS not set,
151 * and NET_IP_ALIGN defined to 2.
153 #define BPF_F_STRICT_ALIGNMENT (1U << 0)
155 #define BPF_PSEUDO_MAP_FD 1
157 /* flags for BPF_MAP_UPDATE_ELEM command */
158 #define BPF_ANY 0 /* create new element or update existing */
159 #define BPF_NOEXIST 1 /* create new element if it didn't exist */
160 #define BPF_EXIST 2 /* update existing element */
162 #define BPF_F_NO_PREALLOC (1U << 0)
163 /* Instead of having one common LRU list in the
164 * BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list
165 * which can scale and perform better.
166 * Note, the LRU nodes (including free nodes) cannot be moved
167 * across different LRU lists.
169 #define BPF_F_NO_COMMON_LRU (1U << 1)
172 struct { /* anonymous struct used by BPF_MAP_CREATE command */
173 __u32 map_type; /* one of enum bpf_map_type */
174 __u32 key_size; /* size of key in bytes */
175 __u32 value_size; /* size of value in bytes */
176 __u32 max_entries; /* max number of entries in a map */
177 __u32 map_flags; /* prealloc or not */
178 __u32 inner_map_fd; /* fd pointing to the inner map */
181 struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
186 __aligned_u64 next_key;
191 struct { /* anonymous struct used by BPF_PROG_LOAD command */
192 __u32 prog_type; /* one of enum bpf_prog_type */
195 __aligned_u64 license;
196 __u32 log_level; /* verbosity level of verifier */
197 __u32 log_size; /* size of user buffer */
198 __aligned_u64 log_buf; /* user supplied buffer */
199 __u32 kern_version; /* checked when prog_type=kprobe */
203 struct { /* anonymous struct used by BPF_OBJ_* commands */
204 __aligned_u64 pathname;
208 struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */
209 __u32 target_fd; /* container object to attach to */
210 __u32 attach_bpf_fd; /* eBPF program to attach */
215 struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */
220 __aligned_u64 data_in;
221 __aligned_u64 data_out;
226 struct { /* anonymous struct used by BPF_*_GET_*_ID */
235 struct { /* anonymous struct used by BPF_OBJ_GET_INFO_BY_FD */
240 } __attribute__((aligned(8)));
242 /* BPF helper function descriptions:
244 * void *bpf_map_lookup_elem(&map, &key)
245 * Return: Map value or NULL
247 * int bpf_map_update_elem(&map, &key, &value, flags)
248 * Return: 0 on success or negative error
250 * int bpf_map_delete_elem(&map, &key)
251 * Return: 0 on success or negative error
253 * int bpf_probe_read(void *dst, int size, void *src)
254 * Return: 0 on success or negative error
256 * u64 bpf_ktime_get_ns(void)
257 * Return: current ktime
259 * int bpf_trace_printk(const char *fmt, int fmt_size, ...)
260 * Return: length of buffer written or negative error
262 * u32 bpf_prandom_u32(void)
263 * Return: random value
265 * u32 bpf_raw_smp_processor_id(void)
266 * Return: SMP processor ID
268 * int bpf_skb_store_bytes(skb, offset, from, len, flags)
269 * store bytes into packet
270 * @skb: pointer to skb
271 * @offset: offset within packet from skb->mac_header
272 * @from: pointer where to copy bytes from
273 * @len: number of bytes to store into packet
274 * @flags: bit 0 - if true, recompute skb->csum
275 * other bits - reserved
276 * Return: 0 on success or negative error
278 * int bpf_l3_csum_replace(skb, offset, from, to, flags)
279 * recompute IP checksum
280 * @skb: pointer to skb
281 * @offset: offset within packet where IP checksum is located
282 * @from: old value of header field
283 * @to: new value of header field
284 * @flags: bits 0-3 - size of header field
285 * other bits - reserved
286 * Return: 0 on success or negative error
288 * int bpf_l4_csum_replace(skb, offset, from, to, flags)
289 * recompute TCP/UDP checksum
290 * @skb: pointer to skb
291 * @offset: offset within packet where TCP/UDP checksum is located
292 * @from: old value of header field
293 * @to: new value of header field
294 * @flags: bits 0-3 - size of header field
295 * bit 4 - is pseudo header
296 * other bits - reserved
297 * Return: 0 on success or negative error
299 * int bpf_tail_call(ctx, prog_array_map, index)
300 * jump into another BPF program
301 * @ctx: context pointer passed to next program
302 * @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY
303 * @index: index inside array that selects specific program to run
304 * Return: 0 on success or negative error
306 * int bpf_clone_redirect(skb, ifindex, flags)
307 * redirect to another netdev
308 * @skb: pointer to skb
309 * @ifindex: ifindex of the net device
310 * @flags: bit 0 - if set, redirect to ingress instead of egress
311 * other bits - reserved
312 * Return: 0 on success or negative error
314 * u64 bpf_get_current_pid_tgid(void)
315 * Return: current->tgid << 32 | current->pid
317 * u64 bpf_get_current_uid_gid(void)
318 * Return: current_gid << 32 | current_uid
320 * int bpf_get_current_comm(char *buf, int size_of_buf)
321 * stores current->comm into buf
322 * Return: 0 on success or negative error
324 * u32 bpf_get_cgroup_classid(skb)
325 * retrieve a proc's classid
326 * @skb: pointer to skb
327 * Return: classid if != 0
329 * int bpf_skb_vlan_push(skb, vlan_proto, vlan_tci)
330 * Return: 0 on success or negative error
332 * int bpf_skb_vlan_pop(skb)
333 * Return: 0 on success or negative error
335 * int bpf_skb_get_tunnel_key(skb, key, size, flags)
336 * int bpf_skb_set_tunnel_key(skb, key, size, flags)
337 * retrieve or populate tunnel metadata
338 * @skb: pointer to skb
339 * @key: pointer to 'struct bpf_tunnel_key'
340 * @size: size of 'struct bpf_tunnel_key'
341 * @flags: room for future extensions
342 * Return: 0 on success or negative error
344 * u64 bpf_perf_event_read(map, flags)
345 * read perf event counter value
346 * @map: pointer to perf_event_array map
347 * @flags: index of event in the map or bitmask flags
348 * Return: value of perf event counter read or error code
350 * int bpf_redirect(ifindex, flags)
351 * redirect to another netdev
352 * @ifindex: ifindex of the net device
355 * bit 0 - if set, redirect to ingress instead of egress
356 * other bits - reserved
358 * all bits - reserved
359 * Return: cls_bpf: TC_ACT_REDIRECT on success or TC_ACT_SHOT on error
360 * xdp_bfp: XDP_REDIRECT on success or XDP_ABORT on error
361 * int bpf_redirect_map(map, key, flags)
362 * redirect to endpoint in map
363 * @map: pointer to dev map
364 * @key: index in map to lookup
366 * Return: XDP_REDIRECT on success or XDP_ABORT on error
368 * u32 bpf_get_route_realm(skb)
369 * retrieve a dst's tclassid
370 * @skb: pointer to skb
371 * Return: realm if != 0
373 * int bpf_perf_event_output(ctx, map, flags, data, size)
374 * output perf raw sample
375 * @ctx: struct pt_regs*
376 * @map: pointer to perf_event_array map
377 * @flags: index of event in the map or bitmask flags
378 * @data: data on stack to be output as raw data
379 * @size: size of data
380 * Return: 0 on success or negative error
382 * int bpf_get_stackid(ctx, map, flags)
383 * walk user or kernel stack and return id
384 * @ctx: struct pt_regs*
385 * @map: pointer to stack_trace map
386 * @flags: bits 0-7 - numer of stack frames to skip
387 * bit 8 - collect user stack instead of kernel
388 * bit 9 - compare stacks by hash only
389 * bit 10 - if two different stacks hash into the same stackid
391 * other bits - reserved
392 * Return: >= 0 stackid on success or negative error
394 * s64 bpf_csum_diff(from, from_size, to, to_size, seed)
395 * calculate csum diff
396 * @from: raw from buffer
397 * @from_size: length of from buffer
399 * @to_size: length of to buffer
400 * @seed: optional seed
401 * Return: csum result or negative error code
403 * int bpf_skb_get_tunnel_opt(skb, opt, size)
404 * retrieve tunnel options metadata
405 * @skb: pointer to skb
406 * @opt: pointer to raw tunnel option data
407 * @size: size of @opt
408 * Return: option size
410 * int bpf_skb_set_tunnel_opt(skb, opt, size)
411 * populate tunnel options metadata
412 * @skb: pointer to skb
413 * @opt: pointer to raw tunnel option data
414 * @size: size of @opt
415 * Return: 0 on success or negative error
417 * int bpf_skb_change_proto(skb, proto, flags)
418 * Change protocol of the skb. Currently supported is v4 -> v6,
419 * v6 -> v4 transitions. The helper will also resize the skb. eBPF
420 * program is expected to fill the new headers via skb_store_bytes
421 * and lX_csum_replace.
422 * @skb: pointer to skb
423 * @proto: new skb->protocol type
425 * Return: 0 on success or negative error
427 * int bpf_skb_change_type(skb, type)
428 * Change packet type of skb.
429 * @skb: pointer to skb
430 * @type: new skb->pkt_type type
431 * Return: 0 on success or negative error
433 * int bpf_skb_under_cgroup(skb, map, index)
434 * Check cgroup2 membership of skb
435 * @skb: pointer to skb
436 * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type
437 * @index: index of the cgroup in the bpf_map
439 * == 0 skb failed the cgroup2 descendant test
440 * == 1 skb succeeded the cgroup2 descendant test
443 * u32 bpf_get_hash_recalc(skb)
444 * Retrieve and possibly recalculate skb->hash.
445 * @skb: pointer to skb
448 * u64 bpf_get_current_task(void)
449 * Returns current task_struct
452 * int bpf_probe_write_user(void *dst, void *src, int len)
453 * safely attempt to write to a location
454 * @dst: destination address in userspace
455 * @src: source address on stack
456 * @len: number of bytes to copy
457 * Return: 0 on success or negative error
459 * int bpf_current_task_under_cgroup(map, index)
460 * Check cgroup2 membership of current task
461 * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type
462 * @index: index of the cgroup in the bpf_map
464 * == 0 current failed the cgroup2 descendant test
465 * == 1 current succeeded the cgroup2 descendant test
468 * int bpf_skb_change_tail(skb, len, flags)
469 * The helper will resize the skb to the given new size, to be used f.e.
470 * with control messages.
471 * @skb: pointer to skb
472 * @len: new skb length
474 * Return: 0 on success or negative error
476 * int bpf_skb_pull_data(skb, len)
477 * The helper will pull in non-linear data in case the skb is non-linear
478 * and not all of len are part of the linear section. Only needed for
479 * read/write with direct packet access.
480 * @skb: pointer to skb
481 * @len: len to make read/writeable
482 * Return: 0 on success or negative error
484 * s64 bpf_csum_update(skb, csum)
485 * Adds csum into skb->csum in case of CHECKSUM_COMPLETE.
486 * @skb: pointer to skb
488 * Return: csum on success or negative error
490 * void bpf_set_hash_invalid(skb)
491 * Invalidate current skb->hash.
492 * @skb: pointer to skb
494 * int bpf_get_numa_node_id()
495 * Return: Id of current NUMA node.
497 * int bpf_skb_change_head()
498 * Grows headroom of skb and adjusts MAC header offset accordingly.
499 * Will extends/reallocae as required automatically.
500 * May change skb data pointer and will thus invalidate any check
501 * performed for direct packet access.
502 * @skb: pointer to skb
503 * @len: length of header to be pushed in front
504 * @flags: Flags (unused for now)
505 * Return: 0 on success or negative error
507 * int bpf_xdp_adjust_head(xdp_md, delta)
508 * Adjust the xdp_md.data by delta
509 * @xdp_md: pointer to xdp_md
510 * @delta: An positive/negative integer to be added to xdp_md.data
511 * Return: 0 on success or negative on error
513 * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr)
514 * Copy a NUL terminated string from unsafe address. In case the string
515 * length is smaller than size, the target is not padded with further NUL
516 * bytes. In case the string length is larger than size, just count-1
517 * bytes are copied and the last byte is set to NUL.
518 * @dst: destination address
519 * @size: maximum number of bytes to copy, including the trailing NUL
520 * @unsafe_ptr: unsafe address
522 * > 0 length of the string including the trailing NUL on success
525 * u64 bpf_get_socket_cookie(skb)
526 * Get the cookie for the socket stored inside sk_buff.
527 * @skb: pointer to skb
528 * Return: 8 Bytes non-decreasing number on success or 0 if the socket
529 * field is missing inside sk_buff
531 * u32 bpf_get_socket_uid(skb)
532 * Get the owner uid of the socket stored inside sk_buff.
533 * @skb: pointer to skb
534 * Return: uid of the socket owner on success or overflowuid if failed.
536 * u32 bpf_set_hash(skb, hash)
537 * Set full skb->hash.
538 * @skb: pointer to skb
541 * int bpf_setsockopt(bpf_socket, level, optname, optval, optlen)
542 * Calls setsockopt. Not all opts are available, only those with
543 * integer optvals plus TCP_CONGESTION.
544 * Supported levels: SOL_SOCKET and IPROTO_TCP
545 * @bpf_socket: pointer to bpf_socket
546 * @level: SOL_SOCKET or IPROTO_TCP
547 * @optname: option name
548 * @optval: pointer to option value
549 * @optlen: length of optval in byes
550 * Return: 0 or negative error
552 * int bpf_skb_adjust_room(skb, len_diff, mode, flags)
553 * Grow or shrink room in sk_buff.
554 * @skb: pointer to skb
555 * @len_diff: (signed) amount of room to grow/shrink
556 * @mode: operation mode (enum bpf_adj_room_mode)
557 * @flags: reserved for future use
558 * Return: 0 on success or negative error code
560 #define __BPF_FUNC_MAPPER(FN) \
562 FN(map_lookup_elem), \
563 FN(map_update_elem), \
564 FN(map_delete_elem), \
568 FN(get_prandom_u32), \
569 FN(get_smp_processor_id), \
570 FN(skb_store_bytes), \
571 FN(l3_csum_replace), \
572 FN(l4_csum_replace), \
574 FN(clone_redirect), \
575 FN(get_current_pid_tgid), \
576 FN(get_current_uid_gid), \
577 FN(get_current_comm), \
578 FN(get_cgroup_classid), \
581 FN(skb_get_tunnel_key), \
582 FN(skb_set_tunnel_key), \
583 FN(perf_event_read), \
585 FN(get_route_realm), \
586 FN(perf_event_output), \
587 FN(skb_load_bytes), \
590 FN(skb_get_tunnel_opt), \
591 FN(skb_set_tunnel_opt), \
592 FN(skb_change_proto), \
593 FN(skb_change_type), \
594 FN(skb_under_cgroup), \
595 FN(get_hash_recalc), \
596 FN(get_current_task), \
597 FN(probe_write_user), \
598 FN(current_task_under_cgroup), \
599 FN(skb_change_tail), \
602 FN(set_hash_invalid), \
603 FN(get_numa_node_id), \
604 FN(skb_change_head), \
605 FN(xdp_adjust_head), \
606 FN(probe_read_str), \
607 FN(get_socket_cookie), \
608 FN(get_socket_uid), \
611 FN(skb_adjust_room), \
614 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
615 * function eBPF program intends to call
617 #define __BPF_ENUM_FN(x) BPF_FUNC_ ## x
619 __BPF_FUNC_MAPPER(__BPF_ENUM_FN)
624 /* All flags used by eBPF helper functions, placed here. */
626 /* BPF_FUNC_skb_store_bytes flags. */
627 #define BPF_F_RECOMPUTE_CSUM (1ULL << 0)
628 #define BPF_F_INVALIDATE_HASH (1ULL << 1)
630 /* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags.
631 * First 4 bits are for passing the header field size.
633 #define BPF_F_HDR_FIELD_MASK 0xfULL
635 /* BPF_FUNC_l4_csum_replace flags. */
636 #define BPF_F_PSEUDO_HDR (1ULL << 4)
637 #define BPF_F_MARK_MANGLED_0 (1ULL << 5)
638 #define BPF_F_MARK_ENFORCE (1ULL << 6)
640 /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */
641 #define BPF_F_INGRESS (1ULL << 0)
643 /* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */
644 #define BPF_F_TUNINFO_IPV6 (1ULL << 0)
646 /* BPF_FUNC_get_stackid flags. */
647 #define BPF_F_SKIP_FIELD_MASK 0xffULL
648 #define BPF_F_USER_STACK (1ULL << 8)
649 #define BPF_F_FAST_STACK_CMP (1ULL << 9)
650 #define BPF_F_REUSE_STACKID (1ULL << 10)
652 /* BPF_FUNC_skb_set_tunnel_key flags. */
653 #define BPF_F_ZERO_CSUM_TX (1ULL << 1)
654 #define BPF_F_DONT_FRAGMENT (1ULL << 2)
656 /* BPF_FUNC_perf_event_output and BPF_FUNC_perf_event_read flags. */
657 #define BPF_F_INDEX_MASK 0xffffffffULL
658 #define BPF_F_CURRENT_CPU BPF_F_INDEX_MASK
659 /* BPF_FUNC_perf_event_output for sk_buff input context. */
660 #define BPF_F_CTXLEN_MASK (0xfffffULL << 32)
662 /* Mode for BPF_FUNC_skb_adjust_room helper. */
663 enum bpf_adj_room_mode {
667 /* user accessible mirror of in-kernel sk_buff.
668 * new fields can only be added to the end of this structure
680 __u32 ingress_ifindex;
691 struct bpf_tunnel_key {
695 __u32 remote_ipv6[4];
703 /* Generic BPF return codes which all BPF program types may support.
704 * The values are binary compatible with their TC_ACT_* counter-part to
705 * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT
708 * XDP is handled seprately, see XDP_*.
716 /* >127 are reserved for prog type specific return codes */
726 #define XDP_PACKET_HEADROOM 256
728 /* User return codes for XDP prog type.
729 * A valid XDP program must return one of these defined values. All other
730 * return codes are reserved for future use. Unknown return codes will result
741 /* user accessible metadata for XDP packet hook
742 * new fields must be added to the end of this structure
749 #define BPF_TAG_SIZE 8
751 struct bpf_prog_info {
754 __u8 tag[BPF_TAG_SIZE];
755 __u32 jited_prog_len;
756 __u32 xlated_prog_len;
757 __aligned_u64 jited_prog_insns;
758 __aligned_u64 xlated_prog_insns;
759 } __attribute__((aligned(8)));
761 struct bpf_map_info {
768 } __attribute__((aligned(8)));
770 /* User bpf_sock_ops struct to access socket values and specify request ops
772 * Some of this fields are in network (bigendian) byte order and may need
773 * to be converted before use (bpf_ntohl() defined in samples/bpf/bpf_endian.h).
774 * New fields can only be added at the end of this structure
776 struct bpf_sock_ops {
783 __u32 remote_ip4; /* Stored in network byte order */
784 __u32 local_ip4; /* Stored in network byte order */
785 __u32 remote_ip6[4]; /* Stored in network byte order */
786 __u32 local_ip6[4]; /* Stored in network byte order */
787 __u32 remote_port; /* Stored in network byte order */
788 __u32 local_port; /* stored in host byte order */
791 /* List of known BPF sock_ops operators.
792 * New entries can only be added at the end
796 BPF_SOCK_OPS_TIMEOUT_INIT, /* Should return SYN-RTO value to use or
797 * -1 if default value should be used
799 BPF_SOCK_OPS_RWND_INIT, /* Should return initial advertized
800 * window (in packets) or -1 if default
801 * value should be used
803 BPF_SOCK_OPS_TCP_CONNECT_CB, /* Calls BPF program right before an
804 * active connection is initialized
806 BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB, /* Calls BPF program when an
807 * active connection is
810 BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB, /* Calls BPF program when a
811 * passive connection is
814 BPF_SOCK_OPS_NEEDS_ECN, /* If connection's congestion control
819 #define TCP_BPF_IW 1001 /* Set TCP initial congestion window */
820 #define TCP_BPF_SNDCWND_CLAMP 1002 /* Set sndcwnd_clamp */
822 #endif /* _UAPI__LINUX_BPF_H__ */