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 21 #include <net/addrconf.h> 22 #include <net/ipv6.h> 23 #include <net/ip6_route.h> 24 #include <net/protocol.h> 25 #include <net/udp.h> 26 #include <net/transp_v6.h> 27 #include <net/ping.h> 28 29 struct proto pingv6_prot = { 30 .name = "PINGv6", 31 .owner = THIS_MODULE, 32 .init = ping_init_sock, 33 .close = ping_close, 34 .connect = ip6_datagram_connect, 35 .disconnect = udp_disconnect, 36 .setsockopt = ipv6_setsockopt, 37 .getsockopt = ipv6_getsockopt, 38 .sendmsg = ping_v6_sendmsg, 39 .recvmsg = ping_recvmsg, 40 .bind = ping_bind, 41 .backlog_rcv = ping_queue_rcv_skb, 42 .hash = ping_hash, 43 .unhash = ping_unhash, 44 .get_port = ping_get_port, 45 .obj_size = sizeof(struct raw6_sock), 46 }; 47 EXPORT_SYMBOL_GPL(pingv6_prot); 48 49 static struct inet_protosw pingv6_protosw = { 50 .type = SOCK_DGRAM, 51 .protocol = IPPROTO_ICMPV6, 52 .prot = &pingv6_prot, 53 .ops = &inet6_dgram_ops, 54 .no_check = UDP_CSUM_DEFAULT, 55 .flags = INET_PROTOSW_REUSE, 56 }; 57 58 59 /* Compatibility glue so we can support IPv6 when it's compiled as a module */ 60 static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 61 int *addr_len) 62 { 63 return -EAFNOSUPPORT; 64 } 65 static int dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 66 struct sk_buff *skb) 67 { 68 return -EAFNOSUPPORT; 69 } 70 static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err) 71 { 72 return -EAFNOSUPPORT; 73 } 74 static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 75 __be16 port, u32 info, u8 *payload) {} 76 static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 77 const struct net_device *dev, int strict) 78 { 79 return 0; 80 } 81 82 int ping_v6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 83 size_t len) 84 { 85 struct inet_sock *inet = inet_sk(sk); 86 struct ipv6_pinfo *np = inet6_sk(sk); 87 struct icmp6hdr user_icmph; 88 int addr_type; 89 struct in6_addr *daddr; 90 int iif = 0; 91 struct flowi6 fl6; 92 int err; 93 int hlimit; 94 struct dst_entry *dst; 95 struct rt6_info *rt; 96 struct pingfakehdr pfh; 97 98 pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); 99 100 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph, 101 sizeof(user_icmph)); 102 if (err) 103 return err; 104 105 if (msg->msg_name) { 106 struct sockaddr_in6 *u = (struct sockaddr_in6 *) msg->msg_name; 107 if (msg->msg_namelen < sizeof(struct sockaddr_in6) || 108 u->sin6_family != AF_INET6) { 109 return -EINVAL; 110 } 111 if (sk->sk_bound_dev_if && 112 sk->sk_bound_dev_if != u->sin6_scope_id) { 113 return -EINVAL; 114 } 115 daddr = &(u->sin6_addr); 116 iif = u->sin6_scope_id; 117 } else { 118 if (sk->sk_state != TCP_ESTABLISHED) 119 return -EDESTADDRREQ; 120 daddr = &sk->sk_v6_daddr; 121 } 122 123 if (!iif) 124 iif = sk->sk_bound_dev_if; 125 126 addr_type = ipv6_addr_type(daddr); 127 if (__ipv6_addr_needs_scope_id(addr_type) && !iif) 128 return -EINVAL; 129 if (addr_type & IPV6_ADDR_MAPPED) 130 return -EINVAL; 131 132 /* TODO: use ip6_datagram_send_ctl to get options from cmsg */ 133 134 memset(&fl6, 0, sizeof(fl6)); 135 136 fl6.flowi6_proto = IPPROTO_ICMPV6; 137 fl6.saddr = np->saddr; 138 fl6.daddr = *daddr; 139 fl6.fl6_icmp_type = user_icmph.icmp6_type; 140 fl6.fl6_icmp_code = user_icmph.icmp6_code; 141 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 142 143 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 144 fl6.flowi6_oif = np->mcast_oif; 145 else if (!fl6.flowi6_oif) 146 fl6.flowi6_oif = np->ucast_oif; 147 148 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, 1); 149 if (IS_ERR(dst)) 150 return PTR_ERR(dst); 151 rt = (struct rt6_info *) dst; 152 153 np = inet6_sk(sk); 154 if (!np) 155 return -EBADF; 156 157 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 158 fl6.flowi6_oif = np->mcast_oif; 159 else if (!fl6.flowi6_oif) 160 fl6.flowi6_oif = np->ucast_oif; 161 162 pfh.icmph.type = user_icmph.icmp6_type; 163 pfh.icmph.code = user_icmph.icmp6_code; 164 pfh.icmph.checksum = 0; 165 pfh.icmph.un.echo.id = inet->inet_sport; 166 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence; 167 pfh.iov = msg->msg_iov; 168 pfh.wcheck = 0; 169 pfh.family = AF_INET6; 170 171 if (ipv6_addr_is_multicast(&fl6.daddr)) 172 hlimit = np->mcast_hops; 173 else 174 hlimit = np->hop_limit; 175 if (hlimit < 0) 176 hlimit = ip6_dst_hoplimit(dst); 177 178 lock_sock(sk); 179 err = ip6_append_data(sk, ping_getfrag, &pfh, len, 180 0, hlimit, 181 np->tclass, NULL, &fl6, rt, 182 MSG_DONTWAIT, np->dontfrag); 183 184 if (err) { 185 ICMP6_INC_STATS_BH(sock_net(sk), rt->rt6i_idev, 186 ICMP6_MIB_OUTERRORS); 187 ip6_flush_pending_frames(sk); 188 } else { 189 err = icmpv6_push_pending_frames(sk, &fl6, 190 (struct icmp6hdr *) &pfh.icmph, 191 len); 192 } 193 release_sock(sk); 194 195 if (err) 196 return err; 197 198 return len; 199 } 200 201 #ifdef CONFIG_PROC_FS 202 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos) 203 { 204 return ping_seq_start(seq, pos, AF_INET6); 205 } 206 207 static int ping_v6_seq_show(struct seq_file *seq, void *v) 208 { 209 if (v == SEQ_START_TOKEN) { 210 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 211 } else { 212 int bucket = ((struct ping_iter_state *) seq->private)->bucket; 213 struct inet_sock *inet = inet_sk(v); 214 __u16 srcp = ntohs(inet->inet_sport); 215 __u16 destp = ntohs(inet->inet_dport); 216 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 217 } 218 return 0; 219 } 220 221 static struct ping_seq_afinfo ping_v6_seq_afinfo = { 222 .name = "icmp6", 223 .family = AF_INET6, 224 .seq_fops = &ping_seq_fops, 225 .seq_ops = { 226 .start = ping_v6_seq_start, 227 .show = ping_v6_seq_show, 228 .next = ping_seq_next, 229 .stop = ping_seq_stop, 230 }, 231 }; 232 233 static int __net_init ping_v6_proc_init_net(struct net *net) 234 { 235 return ping_proc_register(net, &ping_v6_seq_afinfo); 236 } 237 238 static void __net_init ping_v6_proc_exit_net(struct net *net) 239 { 240 return ping_proc_unregister(net, &ping_v6_seq_afinfo); 241 } 242 243 static struct pernet_operations ping_v6_net_ops = { 244 .init = ping_v6_proc_init_net, 245 .exit = ping_v6_proc_exit_net, 246 }; 247 #endif 248 249 int __init pingv6_init(void) 250 { 251 #ifdef CONFIG_PROC_FS 252 int ret = register_pernet_subsys(&ping_v6_net_ops); 253 if (ret) 254 return ret; 255 #endif 256 pingv6_ops.ipv6_recv_error = ipv6_recv_error; 257 pingv6_ops.ip6_datagram_recv_ctl = ip6_datagram_recv_ctl; 258 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert; 259 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error; 260 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr; 261 return inet6_register_protosw(&pingv6_protosw); 262 } 263 264 /* This never gets called because it's not possible to unload the ipv6 module, 265 * but just in case. 266 */ 267 void pingv6_exit(void) 268 { 269 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error; 270 pingv6_ops.ip6_datagram_recv_ctl = dummy_ip6_datagram_recv_ctl; 271 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert; 272 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error; 273 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr; 274 #ifdef CONFIG_PROC_FS 275 unregister_pernet_subsys(&ping_v6_net_ops); 276 #endif 277 inet6_unregister_protosw(&pingv6_protosw); 278 } 279