Lines Matching +full:buffered +full:- +full:negative
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2013-2018 B.A.T.M.A.N. contributors:
38 #include "hard-interface.h"
42 #include "soft-interface.h"
45 * batadv_frag_clear_chain() - delete entries in the fragment buffer chain
57 hlist_del(&entry->list); in batadv_frag_clear_chain()
60 kfree_skb(entry->skb); in batadv_frag_clear_chain()
62 consume_skb(entry->skb); in batadv_frag_clear_chain()
69 * batadv_frag_purge_orig() - free fragments associated to an orig
80 chain = &orig_node->fragments[i]; in batadv_frag_purge_orig()
81 spin_lock_bh(&chain->lock); in batadv_frag_purge_orig()
84 batadv_frag_clear_chain(&chain->fragment_list, true); in batadv_frag_purge_orig()
85 chain->size = 0; in batadv_frag_purge_orig()
88 spin_unlock_bh(&chain->lock); in batadv_frag_purge_orig()
93 * batadv_frag_size_limit() - maximum possible size of packet to be fragmented
101 limit -= sizeof(struct batadv_frag_packet); in batadv_frag_size_limit()
108 * batadv_frag_init_chain() - check and prepare fragment chain for new fragment
115 * Caller must hold chain->lock.
123 lockdep_assert_held(&chain->lock); in batadv_frag_init_chain()
125 if (chain->seqno == seqno) in batadv_frag_init_chain()
128 if (!hlist_empty(&chain->fragment_list)) in batadv_frag_init_chain()
129 batadv_frag_clear_chain(&chain->fragment_list, true); in batadv_frag_init_chain()
131 chain->size = 0; in batadv_frag_init_chain()
132 chain->seqno = seqno; in batadv_frag_init_chain()
138 * batadv_frag_insert_packet() - insert a fragment into a fragment chain
146 * Return: true if skb is buffered, false on error. If the chain has all the
163 * the later merge. Non-linear merge should be added to remove this in batadv_frag_insert_packet()
169 frag_packet = (struct batadv_frag_packet *)skb->data; in batadv_frag_insert_packet()
170 seqno = ntohs(frag_packet->seqno); in batadv_frag_insert_packet()
177 frag_entry_new->skb = skb; in batadv_frag_insert_packet()
178 frag_entry_new->no = frag_packet->no; in batadv_frag_insert_packet()
184 chain = &orig_node->fragments[bucket]; in batadv_frag_insert_packet()
185 spin_lock_bh(&chain->lock); in batadv_frag_insert_packet()
187 hlist_add_head(&frag_entry_new->list, &chain->fragment_list); in batadv_frag_insert_packet()
188 chain->size = skb->len - hdr_size; in batadv_frag_insert_packet()
189 chain->timestamp = jiffies; in batadv_frag_insert_packet()
190 chain->total_size = ntohs(frag_packet->total_size); in batadv_frag_insert_packet()
196 hlist_for_each_entry(frag_entry_curr, &chain->fragment_list, list) { in batadv_frag_insert_packet()
198 if (frag_entry_curr->no == frag_entry_new->no) in batadv_frag_insert_packet()
202 if (frag_entry_curr->no < frag_entry_new->no) { in batadv_frag_insert_packet()
203 hlist_add_before(&frag_entry_new->list, in batadv_frag_insert_packet()
204 &frag_entry_curr->list); in batadv_frag_insert_packet()
205 chain->size += skb->len - hdr_size; in batadv_frag_insert_packet()
206 chain->timestamp = jiffies; in batadv_frag_insert_packet()
217 hlist_add_behind(&frag_entry_new->list, &frag_entry_last->list); in batadv_frag_insert_packet()
218 chain->size += skb->len - hdr_size; in batadv_frag_insert_packet()
219 chain->timestamp = jiffies; in batadv_frag_insert_packet()
224 if (chain->size > batadv_frag_size_limit() || in batadv_frag_insert_packet()
225 chain->total_size != ntohs(frag_packet->total_size) || in batadv_frag_insert_packet()
226 chain->total_size > batadv_frag_size_limit()) { in batadv_frag_insert_packet()
231 batadv_frag_clear_chain(&chain->fragment_list, true); in batadv_frag_insert_packet()
232 chain->size = 0; in batadv_frag_insert_packet()
233 } else if (ntohs(frag_packet->total_size) == chain->size) { in batadv_frag_insert_packet()
235 hlist_move_list(&chain->fragment_list, chain_out); in batadv_frag_insert_packet()
236 chain->size = 0; in batadv_frag_insert_packet()
240 spin_unlock_bh(&chain->lock); in batadv_frag_insert_packet()
252 * batadv_frag_merge_packets() - merge a chain of fragments
272 entry = hlist_entry(chain->first, struct batadv_frag_list_entry, list); in batadv_frag_merge_packets()
273 hlist_del(&entry->list); in batadv_frag_merge_packets()
274 skb_out = entry->skb; in batadv_frag_merge_packets()
277 packet = (struct batadv_frag_packet *)skb_out->data; in batadv_frag_merge_packets()
278 size = ntohs(packet->total_size) + hdr_size; in batadv_frag_merge_packets()
281 if (pskb_expand_head(skb_out, 0, size - skb_out->len, GFP_ATOMIC) < 0) { in batadv_frag_merge_packets()
292 skb_out->ip_summed = CHECKSUM_NONE; in batadv_frag_merge_packets()
293 memmove(skb_out->data - ETH_HLEN, skb_mac_header(skb_out), ETH_HLEN); in batadv_frag_merge_packets()
294 skb_set_mac_header(skb_out, -ETH_HLEN); in batadv_frag_merge_packets()
300 size = entry->skb->len - hdr_size; in batadv_frag_merge_packets()
301 skb_put_data(skb_out, entry->skb->data + hdr_size, size); in batadv_frag_merge_packets()
311 * batadv_frag_skb_buffer() - buffer fragment for later merge
318 * set *skb to merged packet; 2) Packet is buffered: Return true and set *skb
321 * Return: true when packet is merged or buffered, false when skb is not not
351 * batadv_frag_skb_fwd() - forward fragments that would exceed MTU when merged
356 * Look up the next-hop of the fragments payload and check if the merged packet
357 * will exceed the MTU towards the next-hop. If so, the fragment is forwarded
366 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); in batadv_frag_skb_fwd()
373 packet = (struct batadv_frag_packet *)skb->data; in batadv_frag_skb_fwd()
374 orig_node_dst = batadv_orig_hash_find(bat_priv, packet->dest); in batadv_frag_skb_fwd()
385 total_size = ntohs(packet->total_size); in batadv_frag_skb_fwd()
386 if (total_size > neigh_node->if_incoming->net_dev->mtu) { in batadv_frag_skb_fwd()
389 skb->len + ETH_HLEN); in batadv_frag_skb_fwd()
391 packet->ttl--; in batadv_frag_skb_fwd()
405 * batadv_frag_create() - create a fragment from skb
428 skb_fragment->priority = skb->priority; in batadv_frag_create()
430 /* Eat the last mtu-bytes of the skb */ in batadv_frag_create()
432 skb_split(skb, skb_fragment, skb->len - fragment_size); in batadv_frag_create()
436 memcpy(skb_fragment->data, frag_head, header_size); in batadv_frag_create()
443 * batadv_frag_send_packet() - create up to 16 fragments from the passed skb
446 * @neigh_node: next-hop of the created fragments
448 * Return: the netdev tx status or a negative errno code on a failure
458 unsigned int mtu = neigh_node->if_incoming->net_dev->mtu; in batadv_frag_send_packet()
463 /* To avoid merge and refragmentation at next-hops we never send in batadv_frag_send_packet()
467 max_fragment_size = mtu - header_size; in batadv_frag_send_packet()
469 if (skb->len == 0 || max_fragment_size == 0) in batadv_frag_send_packet()
470 return -EINVAL; in batadv_frag_send_packet()
472 num_fragments = (skb->len - 1) / max_fragment_size + 1; in batadv_frag_send_packet()
473 max_fragment_size = (skb->len - 1) / num_fragments + 1; in batadv_frag_send_packet()
477 ret = -EAGAIN; in batadv_frag_send_packet()
481 bat_priv = orig_node->bat_priv; in batadv_frag_send_packet()
484 ret = -EINVAL; in batadv_frag_send_packet()
492 frag_header.seqno = htons(atomic_inc_return(&bat_priv->frag_seqno)); in batadv_frag_send_packet()
495 frag_header.total_size = htons(skb->len); in batadv_frag_send_packet()
497 /* skb->priority values from 256->263 are magic values to in batadv_frag_send_packet()
502 if (skb->priority >= 256 && skb->priority <= 263) in batadv_frag_send_packet()
503 frag_header.priority = skb->priority - 256; in batadv_frag_send_packet()
507 ether_addr_copy(frag_header.orig, primary_if->net_dev->dev_addr); in batadv_frag_send_packet()
508 ether_addr_copy(frag_header.dest, orig_node->orig); in batadv_frag_send_packet()
511 while (skb->len > max_fragment_size) { in batadv_frag_send_packet()
513 if (unlikely(frag_header.no == BATADV_FRAG_MAX_FRAGMENTS - 1)) { in batadv_frag_send_packet()
514 ret = -EINVAL; in batadv_frag_send_packet()
521 ret = -ENOMEM; in batadv_frag_send_packet()
527 skb_fragment->len + ETH_HLEN); in batadv_frag_send_packet()
540 ret = -ENOMEM; in batadv_frag_send_packet()
544 memcpy(skb->data, &frag_header, header_size); in batadv_frag_send_packet()
549 skb->len + ETH_HLEN); in batadv_frag_send_packet()