umcast_kern.c 4.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * user-mode-linux networking multicast transport
  4. * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
  5. * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  6. *
  7. * based on the existing uml-networking code, which is
  8. * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
  9. * James Leu (jleu@mindspring.net).
  10. * Copyright (C) 2001 by various other people who didn't put their name here.
  11. *
  12. */
  13. #include <linux/init.h>
  14. #include <linux/netdevice.h>
  15. #include "umcast.h"
  16. #include <net_kern.h>
  17. struct umcast_init {
  18. char *addr;
  19. int lport;
  20. int rport;
  21. int ttl;
  22. bool unicast;
  23. };
  24. static void umcast_init(struct net_device *dev, void *data)
  25. {
  26. struct uml_net_private *pri;
  27. struct umcast_data *dpri;
  28. struct umcast_init *init = data;
  29. pri = netdev_priv(dev);
  30. dpri = (struct umcast_data *) pri->user;
  31. dpri->addr = init->addr;
  32. dpri->lport = init->lport;
  33. dpri->rport = init->rport;
  34. dpri->unicast = init->unicast;
  35. dpri->ttl = init->ttl;
  36. dpri->dev = dev;
  37. if (dpri->unicast) {
  38. printk(KERN_INFO "ucast backend address: %s:%u listen port: "
  39. "%u\n", dpri->addr, dpri->rport, dpri->lport);
  40. } else {
  41. printk(KERN_INFO "mcast backend multicast address: %s:%u, "
  42. "TTL:%u\n", dpri->addr, dpri->lport, dpri->ttl);
  43. }
  44. }
  45. static int umcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
  46. {
  47. return net_recvfrom(fd, skb_mac_header(skb),
  48. skb->dev->mtu + ETH_HEADER_OTHER);
  49. }
  50. static int umcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
  51. {
  52. return umcast_user_write(fd, skb->data, skb->len,
  53. (struct umcast_data *) &lp->user);
  54. }
  55. static const struct net_kern_info umcast_kern_info = {
  56. .init = umcast_init,
  57. .protocol = eth_protocol,
  58. .read = umcast_read,
  59. .write = umcast_write,
  60. };
  61. static int mcast_setup(char *str, char **mac_out, void *data)
  62. {
  63. struct umcast_init *init = data;
  64. char *port_str = NULL, *ttl_str = NULL, *remain;
  65. char *last;
  66. *init = ((struct umcast_init)
  67. { .addr = "239.192.168.1",
  68. .lport = 1102,
  69. .ttl = 1 });
  70. remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
  71. NULL);
  72. if (remain != NULL) {
  73. printk(KERN_ERR "mcast_setup - Extra garbage on "
  74. "specification : '%s'\n", remain);
  75. return 0;
  76. }
  77. if (port_str != NULL) {
  78. init->lport = simple_strtoul(port_str, &last, 10);
  79. if ((*last != '\0') || (last == port_str)) {
  80. printk(KERN_ERR "mcast_setup - Bad port : '%s'\n",
  81. port_str);
  82. return 0;
  83. }
  84. }
  85. if (ttl_str != NULL) {
  86. init->ttl = simple_strtoul(ttl_str, &last, 10);
  87. if ((*last != '\0') || (last == ttl_str)) {
  88. printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n",
  89. ttl_str);
  90. return 0;
  91. }
  92. }
  93. init->unicast = false;
  94. init->rport = init->lport;
  95. printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
  96. init->lport, init->ttl);
  97. return 1;
  98. }
  99. static int ucast_setup(char *str, char **mac_out, void *data)
  100. {
  101. struct umcast_init *init = data;
  102. char *lport_str = NULL, *rport_str = NULL, *remain;
  103. char *last;
  104. *init = ((struct umcast_init)
  105. { .addr = "",
  106. .lport = 1102,
  107. .rport = 1102 });
  108. remain = split_if_spec(str, mac_out, &init->addr,
  109. &lport_str, &rport_str, NULL);
  110. if (remain != NULL) {
  111. printk(KERN_ERR "ucast_setup - Extra garbage on "
  112. "specification : '%s'\n", remain);
  113. return 0;
  114. }
  115. if (lport_str != NULL) {
  116. init->lport = simple_strtoul(lport_str, &last, 10);
  117. if ((*last != '\0') || (last == lport_str)) {
  118. printk(KERN_ERR "ucast_setup - Bad listen port : "
  119. "'%s'\n", lport_str);
  120. return 0;
  121. }
  122. }
  123. if (rport_str != NULL) {
  124. init->rport = simple_strtoul(rport_str, &last, 10);
  125. if ((*last != '\0') || (last == rport_str)) {
  126. printk(KERN_ERR "ucast_setup - Bad remote port : "
  127. "'%s'\n", rport_str);
  128. return 0;
  129. }
  130. }
  131. init->unicast = true;
  132. printk(KERN_INFO "Configured ucast device: :%u -> %s:%u\n",
  133. init->lport, init->addr, init->rport);
  134. return 1;
  135. }
  136. static struct transport mcast_transport = {
  137. .list = LIST_HEAD_INIT(mcast_transport.list),
  138. .name = "mcast",
  139. .setup = mcast_setup,
  140. .user = &umcast_user_info,
  141. .kern = &umcast_kern_info,
  142. .private_size = sizeof(struct umcast_data),
  143. .setup_size = sizeof(struct umcast_init),
  144. };
  145. static struct transport ucast_transport = {
  146. .list = LIST_HEAD_INIT(ucast_transport.list),
  147. .name = "ucast",
  148. .setup = ucast_setup,
  149. .user = &umcast_user_info,
  150. .kern = &umcast_kern_info,
  151. .private_size = sizeof(struct umcast_data),
  152. .setup_size = sizeof(struct umcast_init),
  153. };
  154. static int register_umcast(void)
  155. {
  156. register_transport(&mcast_transport);
  157. register_transport(&ucast_transport);
  158. return 0;
  159. }
  160. late_initcall(register_umcast);