Lines Matching +full:mmp +full:- +full:timer
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
7 * Florian La Roche, <rzsfl@rz.uni-sb.de>
31 #include <linux/dma-mapping.h>
56 * NETIF_F_HW_CSUM - The driver (or its device) is able to compute one
62 * NETIF_F_IP_CSUM - Driver (device) is only able to checksum plain
71 * NETIF_F_IPV6_CSUM - Driver (device) is only able to checksum plain
81 * NETIF_F_RXCSUM - Driver (device) performs receive checksum offload.
88 * verification is set in skb->ip_summed. Possible values are:
94 * not in skb->csum. Thus, skb->csum is undefined in this case.
101 * if their checksums are okay. skb->csum is still undefined in this case
114 * skb->csum_level indicates the number of consecutive checksums found in
116 * For instance if a device receives an IPv6->UDP->GRE->IPv4->TCP packet
118 * GRE (checksum flag is set) and TCP, skb->csum_level would be set to
121 * checksum is bad, skb->csum_level would be set to zero (TCP checksum is
127 * packet as seen by netif_rx() and fills in skb->csum. This means the
131 * - Even if device supports only some protocols, but is able to produce
132 * skb->csum, it MUST use CHECKSUM_COMPLETE, not CHECKSUM_UNNECESSARY.
133 * - CHECKSUM_COMPLETE is not applicable to SCTP and FCoE protocols.
142 * referred to by skb->csum_start + skb->csum_offset and any preceding
147 * C. Checksumming on transmit for non-GSO. The stack requests checksum offload
148 * in the skb->ip_summed for a packet. Values are:
153 * from skb->csum_start up to the end, and to record/write the checksum at
154 * offset skb->csum_start + skb->csum_offset. A driver may verify that the
157 * checksum refers to a legitimate transport layer checksum -- it is the
188 * D. Non-IP checksum (CRC) offloads
190 * NETIF_F_SCTP_CRC - This feature indicates that a device is capable of
197 * value of skb->csum_not_inet; skb_crc32c_csum_help is provided to resolve
200 * NETIF_F_FCOE_CRC - This feature indicates that a device is capable of
225 /* Maximum value in skb->csum_level */
230 ((X) - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
232 SKB_WITH_OVERHEAD((PAGE_SIZE << (ORDER)) - (X))
264 /* always valid & non-NULL from FORWARD on, for physdev match */
316 /* Set skb_shinfo(skb)->gso_size to this in case you want skb_segment to
324 * skb_frag_size() - Returns the size of a skb fragment
329 return frag->bv_len; in skb_frag_size()
333 * skb_frag_size_set() - Sets the size of a skb fragment
339 frag->bv_len = size; in skb_frag_size_set()
343 * skb_frag_size_add() - Increments the size of a skb fragment by @delta
349 frag->bv_len += delta; in skb_frag_size_add()
353 * skb_frag_size_sub() - Decrements the size of a skb fragment by @delta
359 frag->bv_len -= delta; in skb_frag_size_sub()
363 * skb_frag_must_loop - Test if %p is a high memory page
376 * skb_frag_foreach_page - loop over pages in a fragment
379 * @f_off: offset from start of f->bv_page
383 * non-zero only on first page.
388 * A fragment can hold a compound page, in which case per-page
394 p_off = (f_off) & (PAGE_SIZE - 1), \
396 min_t(u32, f_len, PAGE_SIZE - p_off) : f_len, \
400 p_len = min_t(u32, f_len - copied, PAGE_SIZE)) \
405 * struct skb_shared_hwtstamps - hardware time stamps
410 * skb->tstamp.
433 /* device driver supports TX zero-copy buffers */
482 } mmp; member
485 #define skb_uarg(SKB) ((struct ubuf_info *)(skb_shinfo(SKB)->destructor_arg))
487 int mm_account_pinned_pages(struct mmpin *mmp, size_t size);
488 void mm_unaccount_pinned_pages(struct mmpin *mmp);
496 refcount_inc(&uarg->refcnt); in sock_zerocopy_get()
510 * the end of the header data, ie. at skb->end.
539 * to the payload part of skb->data. The lower 16 bits hold references to
540 * the entire skb->data. A clone of a headerless skb holds the length of
541 * the header in skb->hdr_len.
543 * All users must obey the rule that the skb->data reference count must be
547 * care about modifications to the header part of skb->data.
550 #define SKB_DATAREF_MASK ((1 << SKB_DATAREF_SHIFT) - 1)
612 * struct sk_buff - socket buffer
617 * for retransmit timer
633 * @csum_start: Offset from skb->head where checksumming should start
646 * @offload_fwd_mark: Packet was L2-forwarded in hardware
647 * @offload_l3_fwd_mark: Packet was L3-forwarded in hardware
657 * @tcp_tsorted_anchor: list structure for TCP (tp->tsorted_sent_queue)
659 * @nf_bridge: Saved data about a bridged frame - see br_netfilter.c
670 * @l4_hash: indicate hash is a canonical 4-tuple hash over transport
698 * skb->inner_protocol_type == ENCAP_TYPE_IPPROTO;
711 * @users: User count - see {datagram,tcp}.c
927 /* only useable after checking ->active_extensions != 0 */
942 * skb_pfmemalloc - Test if the skb was allocated from PFMEMALLOC reserves
947 return unlikely(skb->pfmemalloc); in skb_pfmemalloc()
958 * skb_dst - returns skb dst_entry
968 WARN_ON((skb->_skb_refdst & SKB_DST_NOREF) && in skb_dst()
971 return (struct dst_entry *)(skb->_skb_refdst & SKB_DST_PTRMASK); in skb_dst()
975 * skb_dst_set - sets skb dst
984 skb->_skb_refdst = (unsigned long)dst; in skb_dst_set()
988 * skb_dst_set_noref - sets skb dst, hopefully, without taking reference
1000 skb->_skb_refdst = (unsigned long)dst | SKB_DST_NOREF; in skb_dst_set_noref()
1004 * skb_dst_is_noref - Test if skb dst isn't refcounted
1009 return (skb->_skb_refdst & SKB_DST_NOREF) && skb_dst(skb); in skb_dst_is_noref()
1013 * skb_rtable - Returns the skb &rtable
1021 /* For mangling skb->pkt_type from user space side from applications
1031 * skb_napi_id - Returns the skb's NAPI id
1037 return skb->napi_id; in skb_napi_id()
1044 * skb_unref - decrement the skb's reference count
1053 if (likely(refcount_read(&skb->users) == 1)) in skb_unref()
1055 else if (likely(!refcount_dec_and_test(&skb->users))) in skb_unref()
1092 * alloc_skb - allocate a network buffer
1121 * skb_fclone_busy - check if fclone is busy
1136 return skb->fclone == SKB_FCLONE_ORIG && in skb_fclone_busy()
1137 refcount_read(&fclones->fclone_ref) > 1 && in skb_fclone_busy()
1138 fclones->skb2.sk == sk; in skb_fclone_busy()
1142 * alloc_skb_fclone - allocate a network buffer from fclone cache
1181 * skb_pad - zero pad the tail of an skb
1225 * layer-2 (L2), layer-3 (L3), or layer-4 (L4).
1254 skb->hash = 0; in skb_clear_hash()
1255 skb->sw_hash = 0; in skb_clear_hash()
1256 skb->l4_hash = 0; in skb_clear_hash()
1261 if (!skb->l4_hash) in skb_clear_hash_if_not_l4()
1268 skb->l4_hash = is_l4; in __skb_set_hash()
1269 skb->sw_hash = is_sw; in __skb_set_hash()
1270 skb->hash = hash; in __skb_set_hash()
1369 if (!skb->l4_hash && !skb->sw_hash) in skb_get_hash()
1372 return skb->hash; in skb_get_hash()
1377 if (!skb->l4_hash && !skb->sw_hash) { in skb_get_hash_flowi6()
1384 return skb->hash; in skb_get_hash_flowi6()
1392 return skb->hash; in skb_get_hash_raw()
1397 to->hash = from->hash; in skb_copy_hash()
1398 to->sw_hash = from->sw_hash; in skb_copy_hash()
1399 to->l4_hash = from->l4_hash; in skb_copy_hash()
1406 to->decrypted = from->decrypted; in skb_copy_decrypted()
1413 return skb->head + skb->end; in skb_end_pointer()
1418 return skb->end; in skb_end_offset()
1423 return skb->end; in skb_end_pointer()
1428 return skb->end - skb->head; in skb_end_offset()
1437 return &skb_shinfo(skb)->hwtstamps; in skb_hwtstamps()
1442 bool is_zcopy = skb && skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY; in skb_zcopy()
1455 skb_shinfo(skb)->destructor_arg = uarg; in skb_zcopy_set()
1456 skb_shinfo(skb)->tx_flags |= SKBTX_ZEROCOPY_FRAG; in skb_zcopy_set()
1462 skb_shinfo(skb)->destructor_arg = (void *)((uintptr_t) val | 0x1UL); in skb_zcopy_set_nouarg()
1463 skb_shinfo(skb)->tx_flags |= SKBTX_ZEROCOPY_FRAG; in skb_zcopy_set_nouarg()
1468 return (uintptr_t) skb_shinfo(skb)->destructor_arg & 0x1UL; in skb_zcopy_is_nouarg()
1473 return (void *)((uintptr_t) skb_shinfo(skb)->destructor_arg & ~0x1UL); in skb_zcopy_get_nouarg()
1484 } else if (uarg->callback == sock_zerocopy_callback) { in skb_zcopy_clear()
1485 uarg->zerocopy = uarg->zerocopy && zerocopy; in skb_zcopy_clear()
1488 uarg->callback(uarg, zerocopy); in skb_zcopy_clear()
1491 skb_shinfo(skb)->tx_flags &= ~SKBTX_ZEROCOPY_FRAG; in skb_zcopy_clear()
1502 skb_shinfo(skb)->tx_flags &= ~SKBTX_ZEROCOPY_FRAG; in skb_zcopy_abort()
1508 skb->next = NULL; in skb_mark_not_on_list()
1511 /* Iterate through singly-linked GSO fragments of an skb. */
1513 for ((skb) = (first), (next_skb) = (skb) ? (skb)->next : NULL; (skb); \
1514 (skb) = (next_skb), (next_skb) = (skb) ? (skb)->next : NULL)
1518 __list_del_entry(&skb->list); in skb_list_del_init()
1523 * skb_queue_empty - check if a queue is empty
1530 return list->next == (const struct sk_buff *) list; in skb_queue_empty()
1534 * skb_queue_empty_lockless - check if a queue is empty
1542 return READ_ONCE(list->next) == (const struct sk_buff *) list; in skb_queue_empty_lockless()
1547 * skb_queue_is_last - check if skb is the last entry in the queue
1556 return skb->next == (const struct sk_buff *) list; in skb_queue_is_last()
1560 * skb_queue_is_first - check if skb is the first entry in the queue
1569 return skb->prev == (const struct sk_buff *) list; in skb_queue_is_first()
1573 * skb_queue_next - return the next packet in the queue
1587 return skb->next; in skb_queue_next()
1591 * skb_queue_prev - return the prev packet in the queue
1605 return skb->prev; in skb_queue_prev()
1609 * skb_get - reference buffer
1617 refcount_inc(&skb->users); in skb_get()
1626 * skb_cloned - is the buffer a clone
1635 return skb->cloned && in skb_cloned()
1636 (atomic_read(&skb_shinfo(skb)->dataref) & SKB_DATAREF_MASK) != 1; in skb_cloned()
1650 * skb_header_cloned - is the header a clone
1660 if (!skb->cloned) in skb_header_cloned()
1663 dataref = atomic_read(&skb_shinfo(skb)->dataref); in skb_header_cloned()
1664 dataref = (dataref & SKB_DATAREF_MASK) - (dataref >> SKB_DATAREF_SHIFT); in skb_header_cloned()
1679 * __skb_header_release - release reference to header
1684 skb->nohdr = 1; in __skb_header_release()
1685 atomic_set(&skb_shinfo(skb)->dataref, 1 + (1 << SKB_DATAREF_SHIFT)); in __skb_header_release()
1690 * skb_shared - is the buffer shared
1698 return refcount_read(&skb->users) != 1; in skb_shared()
1702 * skb_share_check - check if buffer is shared and if so clone it
1737 * skb_unshare - make a copy of a shared buffer
1767 * skb_peek - peek at the head of an &sk_buff_head
1781 struct sk_buff *skb = list_->next; in skb_peek()
1789 * __skb_peek - peek at the head of a non-empty &sk_buff_head
1796 return list_->next; in __skb_peek()
1800 * skb_peek_next - peek skb following the given one from a queue
1811 struct sk_buff *next = skb->next; in skb_peek_next()
1819 * skb_peek_tail - peek at the tail of an &sk_buff_head
1833 struct sk_buff *skb = READ_ONCE(list_->prev); in skb_peek_tail()
1842 * skb_queue_len - get queue length
1849 return list_->qlen; in skb_queue_len()
1853 * skb_queue_len_lockless - get queue length
1861 return READ_ONCE(list_->qlen); in skb_queue_len_lockless()
1865 * __skb_queue_head_init - initialize non-spinlock portions of sk_buff_head
1871 * the spinlock. It can also be used for on-stack sk_buff_head
1876 list->prev = list->next = (struct sk_buff *)list; in __skb_queue_head_init()
1877 list->qlen = 0; in __skb_queue_head_init()
1882 * this is needed for now since a whole lot of users of the skb-queue
1890 spin_lock_init(&list->lock); in skb_queue_head_init()
1898 lockdep_set_class(&list->lock, class); in skb_queue_head_init_class()
1904 * The "__skb_xxxx()" functions are the non-atomic ones that
1914 WRITE_ONCE(newsk->next, next); in __skb_insert()
1915 WRITE_ONCE(newsk->prev, prev); in __skb_insert()
1916 WRITE_ONCE(next->prev, newsk); in __skb_insert()
1917 WRITE_ONCE(prev->next, newsk); in __skb_insert()
1918 WRITE_ONCE(list->qlen, list->qlen + 1); in __skb_insert()
1925 struct sk_buff *first = list->next; in __skb_queue_splice()
1926 struct sk_buff *last = list->prev; in __skb_queue_splice()
1928 WRITE_ONCE(first->prev, prev); in __skb_queue_splice()
1929 WRITE_ONCE(prev->next, first); in __skb_queue_splice()
1931 WRITE_ONCE(last->next, next); in __skb_queue_splice()
1932 WRITE_ONCE(next->prev, last); in __skb_queue_splice()
1936 * skb_queue_splice - join two skb lists, this is designed for stacks
1944 __skb_queue_splice(list, (struct sk_buff *) head, head->next); in skb_queue_splice()
1945 head->qlen += list->qlen; in skb_queue_splice()
1950 * skb_queue_splice_init - join two skb lists and reinitialise the emptied list
1960 __skb_queue_splice(list, (struct sk_buff *) head, head->next); in skb_queue_splice_init()
1961 head->qlen += list->qlen; in skb_queue_splice_init()
1967 * skb_queue_splice_tail - join two skb lists, each list being a queue
1975 __skb_queue_splice(list, head->prev, (struct sk_buff *) head); in skb_queue_splice_tail()
1976 head->qlen += list->qlen; in skb_queue_splice_tail()
1981 * skb_queue_splice_tail_init - join two skb lists and reinitialise the emptied list
1992 __skb_queue_splice(list, head->prev, (struct sk_buff *) head); in skb_queue_splice_tail_init()
1993 head->qlen += list->qlen; in skb_queue_splice_tail_init()
1999 * __skb_queue_after - queue a buffer at the list head
2013 __skb_insert(newsk, prev, prev->next, list); in __skb_queue_after()
2023 __skb_insert(newsk, next->prev, next, list); in __skb_queue_before()
2027 * __skb_queue_head - queue a buffer at the list head
2044 * __skb_queue_tail - queue a buffer at the list tail
2069 WRITE_ONCE(list->qlen, list->qlen - 1); in __skb_unlink()
2070 next = skb->next; in __skb_unlink()
2071 prev = skb->prev; in __skb_unlink()
2072 skb->next = skb->prev = NULL; in __skb_unlink()
2073 WRITE_ONCE(next->prev, prev); in __skb_unlink()
2074 WRITE_ONCE(prev->next, next); in __skb_unlink()
2078 * __skb_dequeue - remove from the head of the queue
2095 * __skb_dequeue_tail - remove from the tail of the queue
2114 return skb->data_len; in skb_is_nonlinear()
2119 return skb->len - skb->data_len; in skb_headlen()
2126 for (i = skb_shinfo(skb)->nr_frags - 1; (int)i >= 0; i--) in __skb_pagelen()
2127 len += skb_frag_size(&skb_shinfo(skb)->frags[i]); in __skb_pagelen()
2137 * __skb_fill_page_desc - initialise a paged fragment in an skb
2152 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; in __skb_fill_page_desc()
2159 frag->bv_page = page; in __skb_fill_page_desc()
2160 frag->bv_offset = off; in __skb_fill_page_desc()
2165 skb->pfmemalloc = true; in __skb_fill_page_desc()
2169 * skb_fill_page_desc - initialise a paged fragment in an skb
2176 * As per __skb_fill_page_desc() -- initialises the @i'th fragment of
2186 skb_shinfo(skb)->nr_frags = i + 1; in skb_fill_page_desc()
2200 return skb->head + skb->tail; in skb_tail_pointer()
2205 skb->tail = skb->data - skb->head; in skb_reset_tail_pointer()
2211 skb->tail += offset; in skb_set_tail_pointer()
2217 return skb->tail; in skb_tail_pointer()
2222 skb->tail = skb->data; in skb_reset_tail_pointer()
2227 skb->tail = skb->data + offset; in skb_set_tail_pointer()
2241 skb->tail += len; in __skb_put()
2242 skb->len += len; in __skb_put()
2295 skb->data -= len; in __skb_push()
2296 skb->len += len; in __skb_push()
2297 return skb->data; in __skb_push()
2303 skb->len -= len; in __skb_pull()
2304 BUG_ON(skb->len < skb->data_len); in __skb_pull()
2305 return skb->data += len; in __skb_pull()
2310 return unlikely(len > skb->len) ? NULL : __skb_pull(skb, len); in skb_pull_inline()
2318 !__pskb_pull_tail(skb, len - skb_headlen(skb))) in __pskb_pull()
2320 skb->len -= len; in __pskb_pull()
2321 return skb->data += len; in __pskb_pull()
2326 return unlikely(len > skb->len) ? NULL : __pskb_pull(skb, len); in pskb_pull()
2333 if (unlikely(len > skb->len)) in pskb_may_pull()
2335 return __pskb_pull_tail(skb, len - skb_headlen(skb)) != NULL; in pskb_may_pull()
2341 * skb_headroom - bytes at buffer head
2348 return skb->data - skb->head; in skb_headroom()
2352 * skb_tailroom - bytes at buffer end
2359 return skb_is_nonlinear(skb) ? 0 : skb->end - skb->tail; in skb_tailroom()
2363 * skb_availroom - bytes at buffer end
2374 return skb->end - skb->tail - skb->reserved_tailroom; in skb_availroom()
2378 * skb_reserve - adjust headroom
2387 skb->data += len; in skb_reserve()
2388 skb->tail += len; in skb_reserve()
2392 * skb_tailroom_reserve - adjust reserved_tailroom
2407 if (mtu < skb_tailroom(skb) - needed_tailroom) in skb_tailroom_reserve()
2409 skb->reserved_tailroom = skb_tailroom(skb) - mtu; in skb_tailroom_reserve()
2412 skb->reserved_tailroom = needed_tailroom; in skb_tailroom_reserve()
2421 skb->inner_protocol = protocol; in skb_set_inner_protocol()
2422 skb->inner_protocol_type = ENCAP_TYPE_ETHER; in skb_set_inner_protocol()
2428 skb->inner_ipproto = ipproto; in skb_set_inner_ipproto()
2429 skb->inner_protocol_type = ENCAP_TYPE_IPPROTO; in skb_set_inner_ipproto()
2434 skb->inner_mac_header = skb->mac_header; in skb_reset_inner_headers()
2435 skb->inner_network_header = skb->network_header; in skb_reset_inner_headers()
2436 skb->inner_transport_header = skb->transport_header; in skb_reset_inner_headers()
2441 skb->mac_len = skb->network_header - skb->mac_header; in skb_reset_mac_len()
2447 return skb->head + skb->inner_transport_header; in skb_inner_transport_header()
2452 return skb_inner_transport_header(skb) - skb->data; in skb_inner_transport_offset()
2457 skb->inner_transport_header = skb->data - skb->head; in skb_reset_inner_transport_header()
2464 skb->inner_transport_header += offset; in skb_set_inner_transport_header()
2469 return skb->head + skb->inner_network_header; in skb_inner_network_header()
2474 skb->inner_network_header = skb->data - skb->head; in skb_reset_inner_network_header()
2481 skb->inner_network_header += offset; in skb_set_inner_network_header()
2486 return skb->head + skb->inner_mac_header; in skb_inner_mac_header()
2491 skb->inner_mac_header = skb->data - skb->head; in skb_reset_inner_mac_header()
2498 skb->inner_mac_header += offset; in skb_set_inner_mac_header()
2502 return skb->transport_header != (typeof(skb->transport_header))~0U; in skb_transport_header_was_set()
2507 return skb->head + skb->transport_header; in skb_transport_header()
2512 skb->transport_header = skb->data - skb->head; in skb_reset_transport_header()
2519 skb->transport_header += offset; in skb_set_transport_header()
2524 return skb->head + skb->network_header; in skb_network_header()
2529 skb->network_header = skb->data - skb->head; in skb_reset_network_header()
2535 skb->network_header += offset; in skb_set_network_header()
2540 return skb->head + skb->mac_header; in skb_mac_header()
2545 return skb_mac_header(skb) - skb->data; in skb_mac_offset()
2550 return skb->network_header - skb->mac_header; in skb_mac_header_len()
2555 return skb->mac_header != (typeof(skb->mac_header))~0U; in skb_mac_header_was_set()
2560 skb->mac_header = (typeof(skb->mac_header))~0U; in skb_unset_mac_header()
2565 skb->mac_header = skb->data - skb->head; in skb_reset_mac_header()
2571 skb->mac_header += offset; in skb_set_mac_header()
2576 skb->mac_header = skb->network_header; in skb_pop_mac_header()
2596 skb_set_mac_header(skb, -skb->mac_len); in skb_mac_header_rebuild()
2597 memmove(skb_mac_header(skb), old_mac, skb->mac_len); in skb_mac_header_rebuild()
2603 return skb->csum_start - skb_headroom(skb); in skb_checksum_start_offset()
2608 return skb->head + skb->csum_start; in skb_checksum_start()
2613 return skb_transport_header(skb) - skb->data; in skb_transport_offset()
2618 return skb->transport_header - skb->network_header; in skb_network_header_len()
2623 return skb->inner_transport_header - skb->inner_network_header; in skb_inner_network_header_len()
2628 return skb_network_header(skb) - skb->data; in skb_network_offset()
2633 return skb_inner_network_header(skb) - skb->data; in skb_inner_network_offset()
2695 skb->len = len; in __skb_set_length()
2708 if (skb->data_len) in __pskb_trim()
2716 return (len < skb->len) ? __pskb_trim(skb, len) : 0; in pskb_trim()
2720 * pskb_trim_unique - remove end from a paged unique (not cloned) buffer
2725 * the skb is not cloned so we should never get an error due to out-
2726 * of-memory.
2736 unsigned int diff = len - skb->len; in __skb_grow()
2739 int ret = pskb_expand_head(skb, 0, diff - skb_tailroom(skb), in __skb_grow()
2749 * skb_orphan - orphan a buffer
2758 if (skb->destructor) { in skb_orphan()
2759 skb->destructor(skb); in skb_orphan()
2760 skb->destructor = NULL; in skb_orphan()
2761 skb->sk = NULL; in skb_orphan()
2763 BUG_ON(skb->sk); in skb_orphan()
2768 * skb_orphan_frags - orphan the frags contained in a buffer
2781 skb_uarg(skb)->callback == sock_zerocopy_callback) in skb_orphan_frags()
2795 * __skb_queue_purge - empty a list
2818 * netdev_alloc_skb - allocate an skbuff for rx on a specific device
2885 * __dev_alloc_pages - allocate page for network Rx
2915 * __dev_alloc_page - allocate a page for network Rx
2933 * skb_propagate_pfmemalloc - Propagate pfmemalloc if skb is allocated after RX page
2941 skb->pfmemalloc = true; in skb_propagate_pfmemalloc()
2945 * skb_frag_off() - Returns the offset of a skb fragment
2950 return frag->bv_offset; in skb_frag_off()
2954 * skb_frag_off_add() - Increments the offset of a skb fragment by @delta
2960 frag->bv_offset += delta; in skb_frag_off_add()
2964 * skb_frag_off_set() - Sets the offset of a skb fragment
2970 frag->bv_offset = offset; in skb_frag_off_set()
2974 * skb_frag_off_copy() - Sets the offset of a skb fragment from another fragment
2981 fragto->bv_offset = fragfrom->bv_offset; in skb_frag_off_copy()
2985 * skb_frag_page - retrieve the page referred to by a paged fragment
2992 return frag->bv_page; in skb_frag_page()
2996 * __skb_frag_ref - take an addition reference on a paged fragment.
3007 * skb_frag_ref - take an addition reference on a paged fragment of an skb.
3015 __skb_frag_ref(&skb_shinfo(skb)->frags[f]); in skb_frag_ref()
3019 * __skb_frag_unref - release a reference on a paged fragment.
3030 * skb_frag_unref - release a reference on a paged fragment of an skb.
3038 __skb_frag_unref(&skb_shinfo(skb)->frags[f]); in skb_frag_unref()
3042 * skb_frag_address - gets the address of the data contained in a paged fragment
3054 * skb_frag_address_safe - gets the address of the data contained in a paged fragment
3070 * skb_frag_page_copy() - sets the page in a fragment from another fragment
3077 fragto->bv_page = fragfrom->bv_page; in skb_frag_page_copy()
3081 * __skb_frag_set_page - sets the page contained in a paged fragment
3089 frag->bv_page = page; in __skb_frag_set_page()
3093 * skb_frag_set_page - sets the page contained in a paged fragment of an skb
3103 __skb_frag_set_page(&skb_shinfo(skb)->frags[f], page); in skb_frag_set_page()
3109 * skb_frag_dma_map - maps a paged fragment via the DMA API
3143 * skb_clone_writable - is the header of a clone writable
3153 skb_headroom(skb) + len <= skb->hdr_len; in skb_clone_writable()
3169 delta = headroom - skb_headroom(skb); in __skb_cow()
3178 * skb_cow - copy header of skb when it is required
3186 * The result is skb with writable area skb->head...skb->tail
3195 * skb_cow_head - skb_cow but only making the head writable
3210 * skb_padto - pad an skbuff up to a minimal size
3221 unsigned int size = skb->len; in skb_padto()
3224 return skb_pad(skb, len - size); in skb_padto()
3228 * __skb_put_padto - increase size and pad an skbuff up to a minimal size
3242 unsigned int size = skb->len; in __skb_put_padto()
3245 len -= size; in __skb_put_padto()
3247 return -ENOMEM; in __skb_put_padto()
3254 * skb_put_padto - increase size and pad an skbuff up to a minimal size
3271 const int off = skb->len; in skb_add_data()
3273 if (skb->ip_summed == CHECKSUM_NONE) { in skb_add_data()
3277 skb->csum = csum_block_add(skb->csum, csum, off); in skb_add_data()
3284 return -EFAULT; in skb_add_data()
3293 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; in skb_can_coalesce()
3303 return __pskb_pull_tail(skb, skb->data_len) ? 0 : -ENOMEM; in __skb_linearize()
3307 * skb_linearize - convert paged skb to linear one
3310 * If there is no free memory -ENOMEM is returned, otherwise zero
3319 * skb_has_shared_frag - can any frag be overwritten
3328 skb_shinfo(skb)->tx_flags & SKBTX_SHARED_FRAG; in skb_has_shared_frag()
3332 * skb_linearize_cow - make sure skb is linear and writable
3335 * If there is no free memory -ENOMEM is returned, otherwise zero
3348 if (skb->ip_summed == CHECKSUM_COMPLETE) in __skb_postpull_rcsum()
3349 skb->csum = csum_block_sub(skb->csum, in __skb_postpull_rcsum()
3351 else if (skb->ip_summed == CHECKSUM_PARTIAL && in __skb_postpull_rcsum()
3353 skb->ip_summed = CHECKSUM_NONE; in __skb_postpull_rcsum()
3357 * skb_postpull_rcsum - update checksum for received skb after pull
3376 if (skb->ip_summed == CHECKSUM_COMPLETE) in __skb_postpush_rcsum()
3377 skb->csum = csum_block_add(skb->csum, in __skb_postpush_rcsum()
3382 * skb_postpush_rcsum - update checksum for received skb after push
3399 * skb_push_rcsum - push skb and update receive checksum
3412 skb_postpush_rcsum(skb, skb->data, len); in skb_push_rcsum()
3413 return skb->data; in skb_push_rcsum()
3418 * pskb_trim_rcsum - trim received skb and update checksum
3429 if (likely(len >= skb->len)) in pskb_trim_rcsum()
3436 if (skb->ip_summed == CHECKSUM_COMPLETE) in __skb_trim_rcsum()
3437 skb->ip_summed = CHECKSUM_NONE; in __skb_trim_rcsum()
3444 if (skb->ip_summed == CHECKSUM_COMPLETE) in __skb_grow_rcsum()
3445 skb->ip_summed = CHECKSUM_NONE; in __skb_grow_rcsum()
3452 #define skb_rb_next(skb) rb_to_skb(rb_next(&(skb)->rbnode))
3453 #define skb_rb_prev(skb) rb_to_skb(rb_prev(&(skb)->rbnode))
3456 for (skb = (queue)->next; \
3458 skb = skb->next)
3461 for (skb = (queue)->next, tmp = skb->next; \
3463 skb = tmp, tmp = skb->next)
3467 skb = skb->next)
3482 for (tmp = skb->next; \
3484 skb = tmp, tmp = skb->next)
3487 for (skb = (queue)->prev; \
3489 skb = skb->prev)
3492 for (skb = (queue)->prev, tmp = skb->prev; \
3494 skb = tmp, tmp = skb->prev)
3497 for (tmp = skb->prev; \
3499 skb = tmp, tmp = skb->prev)
3503 return skb_shinfo(skb)->frag_list != NULL; in skb_has_frag_list()
3508 skb_shinfo(skb)->frag_list = NULL; in skb_frag_list_init()
3512 for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next)
3539 return skb_copy_datagram_iter(from, offset, &msg->msg_iter, size); in skb_copy_datagram_msg()
3597 return copy_from_iter_full(data, len, &msg->msg_iter) ? 0 : -EFAULT; in memcpy_from_msg()
3602 return copy_to_iter(data, len, &msg->msg_iter) == len ? 0 : -EFAULT; in memcpy_to_msg()
3621 if (hlen - offset >= len) in __skb_header_pointer()
3634 return __skb_header_pointer(skb, offset, len, skb->data, in skb_header_pointer()
3639 * skb_needs_linearize - check if we need to linearize a given skb
3653 (skb_shinfo(skb)->nr_frags && !(features & NETIF_F_SG))); in skb_needs_linearize()
3660 memcpy(to, skb->data, len); in skb_copy_from_linear_data()
3667 memcpy(to, skb->data + offset, len); in skb_copy_from_linear_data_offset()
3674 memcpy(skb->data, from, len); in skb_copy_to_linear_data()
3682 memcpy(skb->data + offset, from, len); in skb_copy_to_linear_data_offset()
3689 return skb->tstamp; in skb_get_ktime()
3693 * skb_get_timestamp - get timestamp from a skb
3704 *stamp = ns_to_kernel_old_timeval(skb->tstamp); in skb_get_timestamp()
3710 struct timespec64 ts = ktime_to_timespec64(skb->tstamp); in skb_get_new_timestamp()
3712 stamp->tv_sec = ts.tv_sec; in skb_get_new_timestamp()
3713 stamp->tv_usec = ts.tv_nsec / 1000; in skb_get_new_timestamp()
3719 struct timespec64 ts = ktime_to_timespec64(skb->tstamp); in skb_get_timestampns()
3721 stamp->tv_sec = ts.tv_sec; in skb_get_timestampns()
3722 stamp->tv_nsec = ts.tv_nsec; in skb_get_timestampns()
3728 struct timespec64 ts = ktime_to_timespec64(skb->tstamp); in skb_get_new_timestampns()
3730 stamp->tv_sec = ts.tv_sec; in skb_get_new_timestampns()
3731 stamp->tv_nsec = ts.tv_nsec; in skb_get_new_timestampns()
3736 skb->tstamp = ktime_get_real(); in __net_timestamp()
3751 return skb_shinfo(skb)->meta_len; in skb_metadata_len()
3770 #define __it(x, op) (x -= sizeof(u##op)) in __skb_metadata_differs()
3791 return memcmp(a - meta_len, b - meta_len, meta_len); in __skb_metadata_differs()
3810 skb_shinfo(skb)->meta_len = meta_len; in skb_metadata_set()
3839 * skb_complete_tx_timestamp() - deliver cloned skb with tx timestamps
3858 * skb_tstamp_tx - queue clone of skb with send time stamps
3872 * skb_tx_timestamp() - Driver hook for transmit timestamping
3886 if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP) in skb_tx_timestamp()
3891 * skb_complete_wifi_ack - deliver skb with wifi status
3904 return ((skb->ip_summed == CHECKSUM_UNNECESSARY) || in skb_csum_unnecessary()
3905 skb->csum_valid || in skb_csum_unnecessary()
3906 (skb->ip_summed == CHECKSUM_PARTIAL && in skb_csum_unnecessary()
3911 * skb_checksum_complete - Calculate checksum of an entire packet
3915 * the value of skb->csum. The latter can be used to supply the
3923 * if skb->ip_summed is CHECKSUM_UNNECESSARY which indicates that the
3934 if (skb->ip_summed == CHECKSUM_UNNECESSARY) { in __skb_decr_checksum_unnecessary()
3935 if (skb->csum_level == 0) in __skb_decr_checksum_unnecessary()
3936 skb->ip_summed = CHECKSUM_NONE; in __skb_decr_checksum_unnecessary()
3938 skb->csum_level--; in __skb_decr_checksum_unnecessary()
3944 if (skb->ip_summed == CHECKSUM_UNNECESSARY) { in __skb_incr_checksum_unnecessary()
3945 if (skb->csum_level < SKB_MAX_CSUM_LEVEL) in __skb_incr_checksum_unnecessary()
3946 skb->csum_level++; in __skb_incr_checksum_unnecessary()
3947 } else if (skb->ip_summed == CHECKSUM_NONE) { in __skb_incr_checksum_unnecessary()
3948 skb->ip_summed = CHECKSUM_UNNECESSARY; in __skb_incr_checksum_unnecessary()
3949 skb->csum_level = 0; in __skb_incr_checksum_unnecessary()
3955 if (skb->ip_summed == CHECKSUM_UNNECESSARY) { in __skb_reset_checksum_unnecessary()
3956 skb->ip_summed = CHECKSUM_NONE; in __skb_reset_checksum_unnecessary()
3957 skb->csum_level = 0; in __skb_reset_checksum_unnecessary()
3971 skb->csum_valid = 1; in __skb_checksum_validate_needed()
3984 /* Unset checksum-complete
3987 * (uncompressed for instance) and checksum-complete value is
3992 if (skb->ip_summed == CHECKSUM_COMPLETE) in skb_checksum_complete_unset()
3993 skb->ip_summed = CHECKSUM_NONE; in skb_checksum_complete_unset()
4001 * checksum is stored in skb->csum for use in __skb_checksum_complete
4002 * non-zero: value of invalid checksum
4009 if (skb->ip_summed == CHECKSUM_COMPLETE) { in __skb_checksum_validate_complete()
4010 if (!csum_fold(csum_add(psum, skb->csum))) { in __skb_checksum_validate_complete()
4011 skb->csum_valid = 1; in __skb_checksum_validate_complete()
4016 skb->csum = psum; in __skb_checksum_validate_complete()
4018 if (complete || skb->len <= CHECKSUM_BREAK) { in __skb_checksum_validate_complete()
4022 skb->csum_valid = !csum; in __skb_checksum_validate_complete()
4042 * non-zero: value of invalid checksum
4048 skb->csum_valid = 0; \
4073 return (skb->ip_summed == CHECKSUM_NONE && skb->csum_valid); in __skb_checksum_convert_check()
4078 skb->csum = ~pseudo; in __skb_checksum_convert()
4079 skb->ip_summed = CHECKSUM_COMPLETE; in __skb_checksum_convert()
4091 skb->ip_summed = CHECKSUM_PARTIAL; in skb_remcsum_adjust_partial()
4092 skb->csum_start = ((unsigned char *)ptr + start) - skb->head; in skb_remcsum_adjust_partial()
4093 skb->csum_offset = offset - start; in skb_remcsum_adjust_partial()
4097 * When called, ptr indicates the starting point for skb->csum when
4099 * here, skb_postpull_rcsum is done so skb->csum start is ptr.
4111 if (unlikely(skb->ip_summed != CHECKSUM_COMPLETE)) { in skb_remcsum_process()
4113 skb_postpull_rcsum(skb, skb->data, ptr - (void *)skb->data); in skb_remcsum_process()
4116 delta = remcsum_adjust(ptr, skb->csum, start, offset); in skb_remcsum_process()
4118 /* Adjust skb->csum since we changed the packet */ in skb_remcsum_process()
4119 skb->csum = csum_add(skb->csum, delta); in skb_remcsum_process()
4125 return (void *)(skb->_nfct & NFCT_PTRMASK); in skb_nfct()
4134 return skb->_nfct; in skb_get_nfct()
4143 skb->_nfct = nfct; in skb_set_nfct()
4165 * struct skb_ext - sk_buff extensions
4190 if (skb->active_extensions) in skb_ext_put()
4191 __skb_ext_put(skb->extensions); in skb_ext_put()
4197 dst->active_extensions = src->active_extensions; in __skb_ext_copy()
4199 if (src->active_extensions) { in __skb_ext_copy()
4200 struct skb_ext *ext = src->extensions; in __skb_ext_copy()
4202 refcount_inc(&ext->refcnt); in __skb_ext_copy()
4203 dst->extensions = ext; in __skb_ext_copy()
4215 return !!ext->offset[i]; in __skb_ext_exist()
4220 return skb->active_extensions & (1 << id); in skb_ext_exist()
4232 struct skb_ext *ext = skb->extensions; in skb_ext_find()
4234 return (void *)ext + (ext->offset[id] << 3); in skb_ext_find()
4242 if (unlikely(skb->active_extensions)) { in skb_ext_reset()
4243 __skb_ext_put(skb->extensions); in skb_ext_reset()
4244 skb->active_extensions = 0; in skb_ext_reset()
4250 return unlikely(skb->active_extensions); in skb_has_extensions()
4265 skb->_nfct = 0; in nf_reset_ct()
4272 skb->nf_trace = 0; in nf_reset_trace()
4279 skb->ipvs_property = 0; in ipvs_reset()
4288 dst->_nfct = src->_nfct; in __nf_copy()
4293 dst->nf_trace = src->nf_trace; in __nf_copy()
4308 to->secmark = from->secmark; in skb_copy_secmark()
4313 skb->secmark = 0; in skb_init_secmark()
4334 return !skb->destructor && in skb_irq_freeable()
4337 !skb->_skb_refdst && in skb_irq_freeable()
4343 skb->queue_mapping = queue_mapping; in skb_set_queue_mapping()
4348 return skb->queue_mapping; in skb_get_queue_mapping()
4353 to->queue_mapping = from->queue_mapping; in skb_copy_queue_mapping()
4358 skb->queue_mapping = rx_queue + 1; in skb_record_rx_queue()
4363 return skb->queue_mapping - 1; in skb_get_rx_queue()
4368 return skb->queue_mapping != 0; in skb_rx_queue_recorded()
4373 skb->dst_pending_confirm = val; in skb_set_dst_pending_confirm()
4378 return skb->dst_pending_confirm != 0; in skb_get_dst_pending_confirm()
4390 /* Keeps track of mac header offset relative to skb->head.
4392 * For non-tunnel skb it points to skb_mac_header() and for
4406 #define SKB_GSO_CB(skb) ((struct skb_gso_cb *)((skb)->cb + SKB_GSO_CB_OFFSET))
4410 return (skb_mac_header(inner_skb) - inner_skb->head) - in skb_tnl_header_len()
4411 SKB_GSO_CB(inner_skb)->mac_offset; in skb_tnl_header_len()
4425 SKB_GSO_CB(skb)->mac_offset += (new_headroom - headroom); in gso_pskb_expand_head()
4432 if (skb->remcsum_offload) in gso_reset_checksum()
4435 SKB_GSO_CB(skb)->csum = res; in gso_reset_checksum()
4436 SKB_GSO_CB(skb)->csum_start = skb_checksum_start(skb) - skb->head; in gso_reset_checksum()
4440 * from the start of transport header to SKB_GSO_CB(skb)->csum_start, and
4441 * then add in skb->csum (checksum from csum_start to end of packet).
4442 * skb->csum and csum_start are then updated to reflect the checksum of the
4443 * resultant packet starting from the transport header-- the resultant checksum
4450 int plen = (skb->head + SKB_GSO_CB(skb)->csum_start) - csum_start; in gso_make_checksum()
4451 __wsum partial = SKB_GSO_CB(skb)->csum; in gso_make_checksum()
4453 SKB_GSO_CB(skb)->csum = res; in gso_make_checksum()
4454 SKB_GSO_CB(skb)->csum_start = csum_start - skb->head; in gso_make_checksum()
4461 return skb_shinfo(skb)->gso_size; in skb_is_gso()
4467 return skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6; in skb_is_gso_v6()
4473 return skb_shinfo(skb)->gso_type & SKB_GSO_SCTP; in skb_is_gso_sctp()
4479 return skb_shinfo(skb)->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6); in skb_is_gso_tcp()
4484 skb_shinfo(skb)->gso_size = 0; in skb_gso_reset()
4485 skb_shinfo(skb)->gso_segs = 0; in skb_gso_reset()
4486 skb_shinfo(skb)->gso_type = 0; in skb_gso_reset()
4492 if (WARN_ON_ONCE(shinfo->gso_size == GSO_BY_FRAGS)) in skb_increase_gso_size()
4494 shinfo->gso_size += increment; in skb_increase_gso_size()
4500 if (WARN_ON_ONCE(shinfo->gso_size == GSO_BY_FRAGS)) in skb_decrease_gso_size()
4502 shinfo->gso_size -= decrement; in skb_decrease_gso_size()
4513 if (skb_is_nonlinear(skb) && shinfo->gso_size != 0 && in skb_warn_if_lro()
4514 unlikely(shinfo->gso_type == 0)) { in skb_warn_if_lro()
4524 if (skb->ip_summed == CHECKSUM_COMPLETE) in skb_forward_csum()
4525 skb->ip_summed = CHECKSUM_NONE; in skb_forward_csum()
4529 * skb_checksum_none_assert - make sure skb ip_summed is CHECKSUM_NONE
4539 BUG_ON(skb->ip_summed != CHECKSUM_NONE); in skb_checksum_none_assert()
4551 * skb_head_is_locked - Determine if the skb->head is locked down
4561 return !skb->head_frag || skb_cloned(skb); in skb_head_is_locked()
4567 * See Documentation/networking/checksum-offloads.rst for
4570 * pseudo-header) before calling.
4581 skb->csum_offset)); in lco_csum()
4586 return csum_partial(l4_hdr, csum_start - l4_hdr, partial); in lco_csum()
4592 return skb->redirected; in skb_is_redirected()
4601 skb->redirected = 1; in skb_set_redirected()
4602 skb->from_ingress = from_ingress; in skb_set_redirected()
4603 if (skb->from_ingress) in skb_set_redirected()
4604 skb->tstamp = 0; in skb_set_redirected()
4611 skb->redirected = 0; in skb_reset_redirect()
4619 skb->kcov_handle = kcov_handle; in skb_set_kcov_handle()
4626 return skb->kcov_handle; in skb_get_kcov_handle()