ping.c 7.2 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277
  1. /*
  2. * INET An implementation of the TCP/IP protocol suite for the LINUX
  3. * operating system. INET is implemented using the BSD Socket
  4. * interface as the means of communication with the user level.
  5. *
  6. * "Ping" sockets
  7. *
  8. * This program is free software; you can redistribute it and/or
  9. * modify it under the terms of the GNU General Public License
  10. * as published by the Free Software Foundation; either version
  11. * 2 of the License, or (at your option) any later version.
  12. *
  13. * Based on ipv4/ping.c code.
  14. *
  15. * Authors: Lorenzo Colitti (IPv6 support)
  16. * Vasiliy Kulikov / Openwall (IPv4 implementation, for Linux 2.6),
  17. * Pavel Kankovsky (IPv4 implementation, for Linux 2.4.32)
  18. *
  19. */
  20. #include <net/addrconf.h>
  21. #include <net/ipv6.h>
  22. #include <net/ip6_route.h>
  23. #include <net/protocol.h>
  24. #include <net/udp.h>
  25. #include <net/transp_v6.h>
  26. #include <net/ping.h>
  27. struct proto pingv6_prot = {
  28. .name = "PINGv6",
  29. .owner = THIS_MODULE,
  30. .init = ping_init_sock,
  31. .close = ping_close,
  32. .connect = ip6_datagram_connect,
  33. .disconnect = udp_disconnect,
  34. .setsockopt = ipv6_setsockopt,
  35. .getsockopt = ipv6_getsockopt,
  36. .sendmsg = ping_v6_sendmsg,
  37. .recvmsg = ping_recvmsg,
  38. .bind = ping_bind,
  39. .backlog_rcv = ping_queue_rcv_skb,
  40. .hash = ping_hash,
  41. .unhash = ping_unhash,
  42. .get_port = ping_get_port,
  43. .obj_size = sizeof(struct raw6_sock),
  44. };
  45. EXPORT_SYMBOL_GPL(pingv6_prot);
  46. static struct inet_protosw pingv6_protosw = {
  47. .type = SOCK_DGRAM,
  48. .protocol = IPPROTO_ICMPV6,
  49. .prot = &pingv6_prot,
  50. .ops = &inet6_dgram_ops,
  51. .no_check = UDP_CSUM_DEFAULT,
  52. .flags = INET_PROTOSW_REUSE,
  53. };
  54. /* Compatibility glue so we can support IPv6 when it's compiled as a module */
  55. static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
  56. {
  57. return -EAFNOSUPPORT;
  58. }
  59. static int dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
  60. struct sk_buff *skb)
  61. {
  62. return -EAFNOSUPPORT;
  63. }
  64. static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
  65. {
  66. return -EAFNOSUPPORT;
  67. }
  68. static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
  69. __be16 port, u32 info, u8 *payload) {}
  70. static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
  71. const struct net_device *dev, int strict)
  72. {
  73. return 0;
  74. }
  75. int ping_v6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
  76. size_t len)
  77. {
  78. struct inet_sock *inet = inet_sk(sk);
  79. struct ipv6_pinfo *np = inet6_sk(sk);
  80. struct icmp6hdr user_icmph;
  81. int addr_type;
  82. struct in6_addr *daddr;
  83. int iif = 0;
  84. struct flowi6 fl6;
  85. int err;
  86. int hlimit;
  87. struct dst_entry *dst;
  88. struct rt6_info *rt;
  89. struct pingfakehdr pfh;
  90. pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
  91. err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
  92. sizeof(user_icmph));
  93. if (err)
  94. return err;
  95. if (msg->msg_name) {
  96. struct sockaddr_in6 *u = (struct sockaddr_in6 *) msg->msg_name;
  97. if (msg->msg_namelen < sizeof(struct sockaddr_in6) ||
  98. u->sin6_family != AF_INET6) {
  99. return -EINVAL;
  100. }
  101. if (sk->sk_bound_dev_if &&
  102. sk->sk_bound_dev_if != u->sin6_scope_id) {
  103. return -EINVAL;
  104. }
  105. daddr = &(u->sin6_addr);
  106. iif = u->sin6_scope_id;
  107. } else {
  108. if (sk->sk_state != TCP_ESTABLISHED)
  109. return -EDESTADDRREQ;
  110. daddr = &np->daddr;
  111. }
  112. if (!iif)
  113. iif = sk->sk_bound_dev_if;
  114. addr_type = ipv6_addr_type(daddr);
  115. if (__ipv6_addr_needs_scope_id(addr_type) && !iif)
  116. return -EINVAL;
  117. if (addr_type & IPV6_ADDR_MAPPED)
  118. return -EINVAL;
  119. /* TODO: use ip6_datagram_send_ctl to get options from cmsg */
  120. memset(&fl6, 0, sizeof(fl6));
  121. fl6.flowi6_proto = IPPROTO_ICMPV6;
  122. fl6.saddr = np->saddr;
  123. fl6.daddr = *daddr;
  124. fl6.fl6_icmp_type = user_icmph.icmp6_type;
  125. fl6.fl6_icmp_code = user_icmph.icmp6_code;
  126. security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
  127. if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
  128. fl6.flowi6_oif = np->mcast_oif;
  129. else if (!fl6.flowi6_oif)
  130. fl6.flowi6_oif = np->ucast_oif;
  131. dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, 1);
  132. if (IS_ERR(dst))
  133. return PTR_ERR(dst);
  134. rt = (struct rt6_info *) dst;
  135. np = inet6_sk(sk);
  136. if (!np)
  137. return -EBADF;
  138. if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
  139. fl6.flowi6_oif = np->mcast_oif;
  140. else if (!fl6.flowi6_oif)
  141. fl6.flowi6_oif = np->ucast_oif;
  142. pfh.icmph.type = user_icmph.icmp6_type;
  143. pfh.icmph.code = user_icmph.icmp6_code;
  144. pfh.icmph.checksum = 0;
  145. pfh.icmph.un.echo.id = inet->inet_sport;
  146. pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
  147. pfh.iov = msg->msg_iov;
  148. pfh.wcheck = 0;
  149. pfh.family = AF_INET6;
  150. if (ipv6_addr_is_multicast(&fl6.daddr))
  151. hlimit = np->mcast_hops;
  152. else
  153. hlimit = np->hop_limit;
  154. if (hlimit < 0)
  155. hlimit = ip6_dst_hoplimit(dst);
  156. lock_sock(sk);
  157. err = ip6_append_data(sk, ping_getfrag, &pfh, len,
  158. 0, hlimit,
  159. np->tclass, NULL, &fl6, rt,
  160. MSG_DONTWAIT, np->dontfrag);
  161. if (err) {
  162. ICMP6_INC_STATS_BH(sock_net(sk), rt->rt6i_idev,
  163. ICMP6_MIB_OUTERRORS);
  164. ip6_flush_pending_frames(sk);
  165. } else {
  166. err = icmpv6_push_pending_frames(sk, &fl6,
  167. (struct icmp6hdr *) &pfh.icmph,
  168. len);
  169. }
  170. release_sock(sk);
  171. if (err)
  172. return err;
  173. return len;
  174. }
  175. #ifdef CONFIG_PROC_FS
  176. static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
  177. {
  178. return ping_seq_start(seq, pos, AF_INET6);
  179. }
  180. static int ping_v6_seq_show(struct seq_file *seq, void *v)
  181. {
  182. if (v == SEQ_START_TOKEN) {
  183. seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
  184. } else {
  185. int bucket = ((struct ping_iter_state *) seq->private)->bucket;
  186. struct inet_sock *inet = inet_sk(v);
  187. __u16 srcp = ntohs(inet->inet_sport);
  188. __u16 destp = ntohs(inet->inet_dport);
  189. ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
  190. }
  191. return 0;
  192. }
  193. static struct ping_seq_afinfo ping_v6_seq_afinfo = {
  194. .name = "icmp6",
  195. .family = AF_INET6,
  196. .seq_fops = &ping_seq_fops,
  197. .seq_ops = {
  198. .start = ping_v6_seq_start,
  199. .show = ping_v6_seq_show,
  200. .next = ping_seq_next,
  201. .stop = ping_seq_stop,
  202. },
  203. };
  204. static int __net_init ping_v6_proc_init_net(struct net *net)
  205. {
  206. return ping_proc_register(net, &ping_v6_seq_afinfo);
  207. }
  208. static void __net_init ping_v6_proc_exit_net(struct net *net)
  209. {
  210. return ping_proc_unregister(net, &ping_v6_seq_afinfo);
  211. }
  212. static struct pernet_operations ping_v6_net_ops = {
  213. .init = ping_v6_proc_init_net,
  214. .exit = ping_v6_proc_exit_net,
  215. };
  216. #endif
  217. int __init pingv6_init(void)
  218. {
  219. #ifdef CONFIG_PROC_FS
  220. int ret = register_pernet_subsys(&ping_v6_net_ops);
  221. if (ret)
  222. return ret;
  223. #endif
  224. pingv6_ops.ipv6_recv_error = ipv6_recv_error;
  225. pingv6_ops.ip6_datagram_recv_ctl = ip6_datagram_recv_ctl;
  226. pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
  227. pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
  228. pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
  229. return inet6_register_protosw(&pingv6_protosw);
  230. }
  231. /* This never gets called because it's not possible to unload the ipv6 module,
  232. * but just in case.
  233. */
  234. void pingv6_exit(void)
  235. {
  236. pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
  237. pingv6_ops.ip6_datagram_recv_ctl = dummy_ip6_datagram_recv_ctl;
  238. pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
  239. pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
  240. pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
  241. #ifdef CONFIG_PROC_FS
  242. unregister_pernet_subsys(&ping_v6_net_ops);
  243. #endif
  244. inet6_unregister_protosw(&pingv6_protosw);
  245. }