kernel/core/net/packet.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2008  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *  Copyright (C) 2009  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   5  *  Copyright (C) 2010  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   6  *
   7  *  This program is free software: you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation, either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21
  22 #include <config.h>
  23 #include <system.h>
  24 #include <string.h>
  25 #include <dev.h>
  26 #include <net/eth.h>
  27 #include <net/net.h>
  28 #include <net/if.h>
  29 #include <net/packet.h>
  30 #include <task.h>
  31 #include <mutex.h>
  32
  33 MUTEX_CREATE (mutex_packet);
  34
  35 extern netif_t netif_list;
  36 extern unsigned long timer_ticks;
  37
  38 static task_t *task_netcore = NULL;
  39
  40 unsigned net_packet_send (netif_t *netif, packet_t *packet, char *buf, unsigned len)
  41 {
  42         mutex_lock (&mutex_packet);
  43
  44         if (!netif) {
  45                 mutex_unlock (&mutex_packet);
  46                 return 0;
  47         }
  48
  49         memcpy (netif->buf_tx, (char *) packet, 14);
  50         memcpy (netif->buf_tx+14, buf, len);
  51
  52         netif->dev->write ((char *) netif->buf_tx, 14+len);
  53
  54         /* add transfered bytes to stats */
  55         netif->dev->info_tx += 14+len;
  56
  57         mutex_unlock (&mutex_packet);
  58
  59         return 1;
  60 }
  61
  62 /* Here we process a received packets */
  63 unsigned net_packet_handler (char *buf, unsigned len)
  64 {
  65         packet_t *packet = (packet_t *) buf;
  66
  67         if (!packet)
  68                 return 0;
  69
  70         //printf ("net_packet->type: 0x%04x\n", swap16 (packet->type));
  71
  72         switch (packet->type) {
  73 #ifdef CONFIG_PROTO_IPV4
  74                 case NET_PACKET_TYPE_IPV4:
  75                         return net_proto_ip_handler (packet, buf+sizeof (packet_t), len-sizeof (packet_t));
  76 #endif
  77                 case NET_PACKET_TYPE_ARP:
  78                         return net_proto_arp_handler (packet, buf+sizeof (packet_t), len-sizeof (packet_t));
  79 #ifdef CONFIG_PROTO_IPV6
  80                 case NET_PACKET_TYPE_IPV6:
  81                         return net_proto_ipv6_handler (packet, buf+sizeof (packet_t), len-sizeof (packet_t));
  82 #endif
  83         }
  84
  85         return 1;
  86 }
  87
  88 /* Task for checking new incoming packets */
  89 unsigned task_net_packet ()
  90 {
  91         /* let's find network device */
  92         netif_t *netif;
  93         for (netif = netif_list.next; netif != &netif_list; netif = netif->next) {
  94                 if (!netif) {
  95                         task_done (task_netcore);
  96                         schedule ();
  97                         return 0;
  98                 }
  99
 100                 /* alloc 2k packet receive and transfer buffer */
 101                 netif->buf_rx = (char *) kmalloc (2048 * sizeof (char));
 102                 netif->buf_tx = (char *) kmalloc (2048 * sizeof (char));
 103
 104                 if (!netif->buf_rx || !netif->buf_tx) {
 105                         task_done (task_netcore);
 106                         schedule ();
 107                         return 0;
 108                 }
 109         }
 110
 111         /* thread loop */
 112         for (;; schedule ()) {
 113                 for (netif = netif_list.next; netif != &netif_list; netif = netif->next) {
 114                         /* check for incoming data */
 115                         int ret = netdev_rx (netif->dev, netif->buf_rx, 2048);
 116
 117                         /* are there some data ? */
 118                         if (ret) {
 119                                 net_packet_handler (netif->buf_rx, ret);
 120
 121                                 /* clear buffer */
 122                                 memset (netif->buf_rx, 0, 2048);
 123                         }
 124                 }
 125         }
 126
 127         /* free tx and rx buffers for all ethernet devices */
 128         for (netif = netif_list.next; netif != &netif_list; netif = netif->next) {
 129                 kfree (netif->buf_tx);
 130                 kfree (netif->buf_rx);
 131         }
 132
 133         task_done (task_netcore);
 134         schedule ();
 135
 136         return 1;
 137 }
 138
 139
 140 unsigned init_packet ()
 141 {
 142         /* initialize unix domain sockets - we could use it without any network devices */
 143         if (!init_net_proto_unix ())
 144                 return 0;
 145
 146         /* setup hostname of the current machine */
 147         if (!init_hostname ())
 148                 return 0;
 149
 150         /* let's find network device first */
 151         netif_t *netif = netif_findbyname ("eth0"); /* TODO: all interfaces */
 152
 153         /* without one ethernet device it does not matter on netstack */
 154         if (!netif)
 155                 return 1;
 156
 157         if (!init_net_proto_tcp ())
 158                 return 0;
 159
 160         if (!init_net_proto_tcp6 ())
 161                 return 0;
 162
 163         if (!init_net_proto_udp ())
 164                 return 0;
 165
 166         if (!init_net_proto_udp6 ())
 167                 return 0;
 168
 169         if (!init_net_proto_dns ())
 170                 return 0;
 171
 172         if (!init_net_proto_tun6 ())
 173                 return 0;
 174
 175         /* start new task/thread for network core */
 176         task_netcore = (task_t *) task_create ("netcore", (unsigned) task_net_packet, 255);
 177
 178         if (!task_netcore)
 179                 return 0;
 180
 181         return 1;
 182 }