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  *
   6  *  This program is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20
  21 #include <config.h>
  22 #include <system.h>
  23 #include <string.h>
  24 #include <dev.h>
  25 #include <net/eth.h>
  26 #include <net/net.h>
  27 #include <net/if.h>
  28 #include <net/packet.h>
  29 #include <task.h>
  30 #include <mutex.h>
  31
  32 MUTEX_CREATE (mutex_packet);
  33
  34 extern netif_t netif_list;
  35 extern unsigned long timer_ticks;
  36
  37 task_t *task_netcore = NULL;
  38
  39 unsigned net_packet_send (netif_t *netif, packet_t *packet, char *buf, unsigned len)
  40 {
  41         mutex_lock (&mutex_packet);
  42
  43         if (!netif) {
  44                 mutex_unlock (&mutex_packet);
  45                 return 0;
  46         }
  47
  48         //memset (netif->buf_tx, 0, 2048);
  49
  50         memcpy (netif->buf_tx, (char *) packet, 14);
  51         memcpy (netif->buf_tx+14, buf, len);
  52
  53         netif->buf_tx[14+len] = '\0';
  54
  55         netif->dev->write ((char *) netif->buf_tx, 14+len);
  56
  57         /* add transfered bytes to stats */
  58         netif->dev->info_tx += 14+len;
  59
  60         mutex_unlock (&mutex_packet);
  61
  62         return 1;
  63 }
  64
  65 /* Here we process a received packets */
  66 unsigned net_packet_handler (char *buf, unsigned len)
  67 {
  68         packet_t *packet = (packet_t *) buf;
  69
  70         if (!packet)
  71                 return 0;
  72
  73         //printf ("net_packet->type: 0x%04x\n", swap16 (packet->type));
  74
  75         switch (packet->type) {
  76 #ifdef CONFIG_PROTO_IPV4
  77                 case NET_PACKET_TYPE_IPV4:
  78                         return net_proto_ip_handler (packet, buf+sizeof (packet_t), len-sizeof (packet_t));
  79 #endif
  80                 case NET_PACKET_TYPE_ARP:
  81                         return net_proto_arp_handler (packet, buf+sizeof (packet_t), len-sizeof (packet_t));
  82 #ifdef CONFIG_PROTO_IPV6
  83                 case NET_PACKET_TYPE_IPV6:
  84                         return net_proto_ipv6_handler (packet, buf+sizeof (packet_t), len-sizeof (packet_t));
  85 #endif
  86         }
  87
  88         return 1;
  89 }
  90
  91 /* Task for checking new incoming packets */
  92 unsigned task_net_packet ()
  93 {
  94         /* let's find network device */
  95         netif_t *netif;
  96         for (netif = netif_list.next; netif != &netif_list; netif = netif->next) {
  97                 if (!netif) {
  98                         task_done (task_netcore);
  99                         schedule ();
 100                         return 0;
 101                 }
 102
 103                 /* alloc 2k packet receive and transfer buffer */
 104                 netif->buf_rx = (char *) kmalloc (2048 * sizeof (char));
 105                 netif->buf_tx = (char *) kmalloc (2048 * sizeof (char));
 106
 107                 if (!netif->buf_rx || !netif->buf_tx) {
 108                         task_done (task_netcore);
 109                         schedule ();
 110                         return 0;
 111                 }
 112         }
 113
 114         /* thread loop */
 115         for (;; schedule ()) {
 116                 for (netif = netif_list.next; netif != &netif_list; netif = netif->next) {
 117                         /* check for incoming data */
 118                         int ret = netdev_rx (netif->dev, netif->buf_rx, 2048);
 119
 120                         /* are there some data ? */
 121                         if (ret) {
 122                                 net_packet_handler (netif->buf_rx, ret);
 123
 124                                 /* clear buffer */
 125                                 memset (netif->buf_rx, 0, 2048);
 126                         }
 127                 }
 128         }
 129
 130         /* free tx and rx buffers for all ethernet devices */
 131         for (netif = netif_list.next; netif != &netif_list; netif = netif->next) {
 132                 kfree (netif->buf_tx);
 133                 kfree (netif->buf_rx);
 134         }
 135
 136         task_done (task_netcore);
 137         schedule ();
 138
 139         return 1;
 140 }
 141
 142
 143 unsigned init_packet ()
 144 {
 145         /* initialize unix domain sockets - we could use it without any network devices */
 146         if (!init_net_proto_unix ())
 147                 return 0;
 148
 149         /* setup hostname of the current machine */
 150         if (!init_hostname ())
 151                 return 0;
 152
 153         /* let's find network device first */
 154         netif_t *netif = netif_findbyname ("eth0"); /* TODO: all interfaces */
 155
 156         /* without one ethernet device it does not matter on netstack */
 157         if (!netif)
 158                 return 1;
 159
 160         if (!init_net_proto_tcp ())
 161                 return 0;
 162
 163         if (!init_net_proto_tcp6 ())
 164                 return 0;
 165
 166         if (!init_net_proto_udp ())
 167                 return 0;
 168
 169         if (!init_net_proto_udp6 ())
 170                 return 0;
 171
 172         if (!init_net_proto_dns ())
 173                 return 0;
 174
 175         if (!init_net_proto_tun6 ())
 176                 return 0;
 177
 178         /* start new task/thread for network core */
 179         task_netcore = (task_t *) task_create ("netcore", (unsigned) task_net_packet, 255);
 180
 181         if (!task_netcore)
 182                 return 0;
 183
 184         return 1;
 185 }