nr_dev.c 4.3 KB

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  1. /*
  2. * This program is free software; you can redistribute it and/or modify
  3. * it under the terms of the GNU General Public License as published by
  4. * the Free Software Foundation; either version 2 of the License, or
  5. * (at your option) any later version.
  6. *
  7. * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
  8. */
  9. #include <linux/module.h>
  10. #include <linux/proc_fs.h>
  11. #include <linux/kernel.h>
  12. #include <linux/interrupt.h>
  13. #include <linux/fs.h>
  14. #include <linux/types.h>
  15. #include <linux/sysctl.h>
  16. #include <linux/string.h>
  17. #include <linux/socket.h>
  18. #include <linux/errno.h>
  19. #include <linux/fcntl.h>
  20. #include <linux/in.h>
  21. #include <linux/if_ether.h> /* For the statistics structure. */
  22. #include <asm/system.h>
  23. #include <asm/uaccess.h>
  24. #include <asm/io.h>
  25. #include <linux/inet.h>
  26. #include <linux/netdevice.h>
  27. #include <linux/etherdevice.h>
  28. #include <linux/if_arp.h>
  29. #include <linux/skbuff.h>
  30. #include <net/ip.h>
  31. #include <net/arp.h>
  32. #include <net/ax25.h>
  33. #include <net/netrom.h>
  34. /*
  35. * Only allow IP over NET/ROM frames through if the netrom device is up.
  36. */
  37. int nr_rx_ip(struct sk_buff *skb, struct net_device *dev)
  38. {
  39. struct net_device_stats *stats = netdev_priv(dev);
  40. if (!netif_running(dev)) {
  41. stats->rx_dropped++;
  42. return 0;
  43. }
  44. stats->rx_packets++;
  45. stats->rx_bytes += skb->len;
  46. skb->protocol = htons(ETH_P_IP);
  47. /* Spoof incoming device */
  48. skb->dev = dev;
  49. skb->mac.raw = skb->nh.raw;
  50. skb->nh.raw = skb->data;
  51. skb->pkt_type = PACKET_HOST;
  52. netif_rx(skb);
  53. return 1;
  54. }
  55. #ifdef CONFIG_INET
  56. static int nr_rebuild_header(struct sk_buff *skb)
  57. {
  58. unsigned char *bp = skb->data;
  59. if (arp_find(bp + 7, skb))
  60. return 1;
  61. bp[6] &= ~AX25_CBIT;
  62. bp[6] &= ~AX25_EBIT;
  63. bp[6] |= AX25_SSSID_SPARE;
  64. bp += AX25_ADDR_LEN;
  65. bp[6] &= ~AX25_CBIT;
  66. bp[6] |= AX25_EBIT;
  67. bp[6] |= AX25_SSSID_SPARE;
  68. return 0;
  69. }
  70. #else
  71. static int nr_rebuild_header(struct sk_buff *skb)
  72. {
  73. return 1;
  74. }
  75. #endif
  76. static int nr_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
  77. void *daddr, void *saddr, unsigned len)
  78. {
  79. unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
  80. memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
  81. buff[6] &= ~AX25_CBIT;
  82. buff[6] &= ~AX25_EBIT;
  83. buff[6] |= AX25_SSSID_SPARE;
  84. buff += AX25_ADDR_LEN;
  85. if (daddr != NULL)
  86. memcpy(buff, daddr, dev->addr_len);
  87. buff[6] &= ~AX25_CBIT;
  88. buff[6] |= AX25_EBIT;
  89. buff[6] |= AX25_SSSID_SPARE;
  90. buff += AX25_ADDR_LEN;
  91. *buff++ = sysctl_netrom_network_ttl_initialiser;
  92. *buff++ = NR_PROTO_IP;
  93. *buff++ = NR_PROTO_IP;
  94. *buff++ = 0;
  95. *buff++ = 0;
  96. *buff++ = NR_PROTOEXT;
  97. if (daddr != NULL)
  98. return 37;
  99. return -37;
  100. }
  101. static int __must_check nr_set_mac_address(struct net_device *dev, void *addr)
  102. {
  103. struct sockaddr *sa = addr;
  104. int err;
  105. if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
  106. return 0;
  107. if (dev->flags & IFF_UP) {
  108. err = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
  109. if (err)
  110. return err;
  111. ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
  112. }
  113. memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
  114. return 0;
  115. }
  116. static int nr_open(struct net_device *dev)
  117. {
  118. int err;
  119. err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
  120. if (err)
  121. return err;
  122. netif_start_queue(dev);
  123. return 0;
  124. }
  125. static int nr_close(struct net_device *dev)
  126. {
  127. ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
  128. netif_stop_queue(dev);
  129. return 0;
  130. }
  131. static int nr_xmit(struct sk_buff *skb, struct net_device *dev)
  132. {
  133. struct nr_private *nr = netdev_priv(dev);
  134. struct net_device_stats *stats = &nr->stats;
  135. unsigned int len = skb->len;
  136. if (!nr_route_frame(skb, NULL)) {
  137. kfree_skb(skb);
  138. stats->tx_errors++;
  139. return 0;
  140. }
  141. stats->tx_packets++;
  142. stats->tx_bytes += len;
  143. return 0;
  144. }
  145. static struct net_device_stats *nr_get_stats(struct net_device *dev)
  146. {
  147. struct nr_private *nr = netdev_priv(dev);
  148. return &nr->stats;
  149. }
  150. void nr_setup(struct net_device *dev)
  151. {
  152. dev->mtu = NR_MAX_PACKET_SIZE;
  153. dev->hard_start_xmit = nr_xmit;
  154. dev->open = nr_open;
  155. dev->stop = nr_close;
  156. dev->hard_header = nr_header;
  157. dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
  158. dev->addr_len = AX25_ADDR_LEN;
  159. dev->type = ARPHRD_NETROM;
  160. dev->rebuild_header = nr_rebuild_header;
  161. dev->set_mac_address = nr_set_mac_address;
  162. /* New-style flags. */
  163. dev->flags = IFF_NOARP;
  164. dev->get_stats = nr_get_stats;
  165. }