1/* Copyright (C) 2010-2013 B.A.T.M.A.N. contributors: 2 * 3 * Andreas Langer 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of version 2 of the GNU General Public 7 * License as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 17 * 02110-1301, USA 18 */ 19 20#ifndef _NET_BATMAN_ADV_UNICAST_H_ 21#define _NET_BATMAN_ADV_UNICAST_H_ 22 23#include "packet.h" 24 25#define BATADV_FRAG_TIMEOUT 10000 /* purge frag list entries after time in ms */ 26#define BATADV_FRAG_BUFFER_SIZE 6 /* number of list elements in buffer */ 27 28int batadv_frag_reassemble_skb(struct sk_buff *skb, 29 struct batadv_priv *bat_priv, 30 struct sk_buff **new_skb); 31void batadv_frag_list_free(struct list_head *head); 32int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv, 33 struct batadv_hard_iface *hard_iface, 34 const uint8_t dstaddr[]); 35bool batadv_unicast_4addr_prepare_skb(struct batadv_priv *bat_priv, 36 struct sk_buff *skb, 37 struct batadv_orig_node *orig_node, 38 int packet_subtype); 39int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv, 40 struct sk_buff *skb, int packet_type, 41 int packet_subtype); 42 43 44/** 45 * batadv_unicast_send_skb - send the skb encapsulated in a unicast packet 46 * @bat_priv: the bat priv with all the soft interface information 47 * @skb: the payload to send 48 */ 49static inline int batadv_unicast_send_skb(struct batadv_priv *bat_priv, 50 struct sk_buff *skb) 51{ 52 return batadv_unicast_generic_send_skb(bat_priv, skb, BATADV_UNICAST, 53 0); 54} 55 56/** 57 * batadv_unicast_send_skb - send the skb encapsulated in a unicast4addr packet 58 * @bat_priv: the bat priv with all the soft interface information 59 * @skb: the payload to send 60 * @packet_subtype: the batman 4addr packet subtype to use 61 */ 62static inline int batadv_unicast_4addr_send_skb(struct batadv_priv *bat_priv, 63 struct sk_buff *skb, 64 int packet_subtype) 65{ 66 return batadv_unicast_generic_send_skb(bat_priv, skb, 67 BATADV_UNICAST_4ADDR, 68 packet_subtype); 69} 70 71static inline int batadv_frag_can_reassemble(const struct sk_buff *skb, int mtu) 72{ 73 const struct batadv_unicast_frag_packet *unicast_packet; 74 int uneven_correction = 0; 75 unsigned int merged_size; 76 77 unicast_packet = (struct batadv_unicast_frag_packet *)skb->data; 78 79 if (unicast_packet->flags & BATADV_UNI_FRAG_LARGETAIL) { 80 if (unicast_packet->flags & BATADV_UNI_FRAG_HEAD) 81 uneven_correction = 1; 82 else 83 uneven_correction = -1; 84 } 85 86 merged_size = (skb->len - sizeof(*unicast_packet)) * 2; 87 merged_size += sizeof(struct batadv_unicast_packet) + uneven_correction; 88 89 return merged_size <= mtu; 90} 91 92#endif /* _NET_BATMAN_ADV_UNICAST_H_ */ 93