33  * batadv_frag_clear_chain() - delete entries in the fragment buffer chain
34  * @head: head of chain with entries.
35  * @dropped: whether the chain is cleared because all fragments are dropped
64 	struct batadv_frag_table_entry *chain;  in batadv_frag_purge_orig()  local
68 		chain = &orig_node->fragments[i];  in batadv_frag_purge_orig()
69 		spin_lock_bh(&chain->lock);  in batadv_frag_purge_orig()
71 		if (!check_cb || check_cb(chain)) {  in batadv_frag_purge_orig()
72 			batadv_frag_clear_chain(&chain->fragment_list, true);  in batadv_frag_purge_orig()
73 			chain->size = 0;  in batadv_frag_purge_orig()
76 		spin_unlock_bh(&chain->lock);  in batadv_frag_purge_orig()
96  * batadv_frag_init_chain() - check and prepare fragment chain for new fragment
97  * @chain: chain in fragments table to init
100  * Make chain ready for a fragment with sequence number "seqno". Delete existing
103  * Caller must hold chain->lock.
105  * Return: true if chain is empty and the caller can just insert the new
108 static bool batadv_frag_init_chain(struct batadv_frag_table_entry *chain,  in batadv_frag_init_chain()  argument
111 	lockdep_assert_held(&chain->lock);  in batadv_frag_init_chain()
113 	if (chain->seqno == seqno)  in batadv_frag_init_chain()
116 	if (!hlist_empty(&chain->fragment_list))  in batadv_frag_init_chain()
117 		batadv_frag_clear_chain(&chain->fragment_list, true);  in batadv_frag_init_chain()
119 	chain->size = 0;  in batadv_frag_init_chain()
120 	chain->seqno = seqno;  in batadv_frag_init_chain()
126  * batadv_frag_insert_packet() - insert a fragment into a fragment chain
131  * Insert a new fragment into the reverse ordered chain in the right table
134  * Return: true if skb is buffered, false on error. If the chain has all the
135  * fragments needed to merge the packet, the chain is moved to the passed head
136  * to avoid locking the chain in the table.
142 	struct batadv_frag_table_entry *chain;  in batadv_frag_insert_packet()  local
168 	/* Select entry in the "chain table" and delete any prior fragments  in batadv_frag_insert_packet()
172 	chain = &orig_node->fragments[bucket];  in batadv_frag_insert_packet()
173 	spin_lock_bh(&chain->lock);  in batadv_frag_insert_packet()
174 	if (batadv_frag_init_chain(chain, seqno)) {  in batadv_frag_insert_packet()
175 		hlist_add_head(&frag_entry_new->list, &chain->fragment_list);  in batadv_frag_insert_packet()
176 		chain->size = skb->len - hdr_size;  in batadv_frag_insert_packet()
177 		chain->timestamp = jiffies;  in batadv_frag_insert_packet()
178 		chain->total_size = ntohs(frag_packet->total_size);  in batadv_frag_insert_packet()
184 	hlist_for_each_entry(frag_entry_curr, &chain->fragment_list, list) {  in batadv_frag_insert_packet()
193 			chain->size += skb->len - hdr_size;  in batadv_frag_insert_packet()
194 			chain->timestamp = jiffies;  in batadv_frag_insert_packet()
206 		chain->size += skb->len - hdr_size;  in batadv_frag_insert_packet()
207 		chain->timestamp = jiffies;  in batadv_frag_insert_packet()
212 	if (chain->size > batadv_frag_size_limit() ||  in batadv_frag_insert_packet()
213 	    chain->total_size != ntohs(frag_packet->total_size) ||  in batadv_frag_insert_packet()
214 	    chain->total_size > batadv_frag_size_limit()) {  in batadv_frag_insert_packet()
215 		/* Clear chain if total size of either the list or the packet  in batadv_frag_insert_packet()
219 		batadv_frag_clear_chain(&chain->fragment_list, true);  in batadv_frag_insert_packet()
220 		chain->size = 0;  in batadv_frag_insert_packet()
221 	} else if (ntohs(frag_packet->total_size) == chain->size) {  in batadv_frag_insert_packet()
222 		/* All fragments received. Hand over chain to caller. */  in batadv_frag_insert_packet()
223 		hlist_move_list(&chain->fragment_list, chain_out);  in batadv_frag_insert_packet()
224 		chain->size = 0;  in batadv_frag_insert_packet()
228 	spin_unlock_bh(&chain->lock);  in batadv_frag_insert_packet()
240  * batadv_frag_merge_packets() - merge a chain of fragments
241  * @chain: head of chain with fragments
243  * Expand the first skb in the chain and copy the content of the remaining
244  * skb's into the expanded one. After doing so, clear the chain.
249 batadv_frag_merge_packets(struct hlist_head *chain)  in batadv_frag_merge_packets()  argument
260 	entry = hlist_entry(chain->first, struct batadv_frag_list_entry, list);  in batadv_frag_merge_packets()
287 	hlist_for_each_entry(entry, chain, list) {  in batadv_frag_merge_packets()
293 	/* Locking is not needed, because 'chain' is not part of any orig. */  in batadv_frag_merge_packets()
294 	batadv_frag_clear_chain(chain, dropped);  in batadv_frag_merge_packets()