net/batman-adv/unicast.h

   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
  28 int batadv_frag_reassemble_skb(struct sk_buff *skb,
  29                                struct batadv_priv *bat_priv,
  30                                struct sk_buff **new_skb);
  31 void batadv_frag_list_free(struct list_head *head);
  32 int 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[]);
  35 bool 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);
  39 int 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  */
  49 static 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  */
  62 static 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
  71 static 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_ */