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_v6_only, 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 void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 66 struct sk_buff *skb) 67 { 68 } 69 static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err) 70 { 71 return -EAFNOSUPPORT; 72 } 73 static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 74 __be16 port, u32 info, u8 *payload) {} 75 static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 76 const struct net_device *dev, int strict) 77 { 78 return 0; 79 } 80 81 int ping_v6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 82 size_t len) 83 { 84 struct inet_sock *inet = inet_sk(sk); 85 struct ipv6_pinfo *np = inet6_sk(sk); 86 struct icmp6hdr user_icmph; 87 int addr_type; 88 struct in6_addr *daddr; 89 int iif = 0; 90 struct flowi6 fl6; 91 int err; 92 int hlimit; 93 struct dst_entry *dst; 94 struct rt6_info *rt; 95 struct pingfakehdr pfh; 96 97 pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); 98 99 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph, 100 sizeof(user_icmph)); 101 if (err) 102 return err; 103 104 if (msg->msg_name) { 105 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name); 106 if (msg->msg_namelen < sizeof(struct sockaddr_in6) || 107 u->sin6_family != AF_INET6) { 108 return -EINVAL; 109 } 110 if (sk->sk_bound_dev_if && 111 sk->sk_bound_dev_if != u->sin6_scope_id) { 112 return -EINVAL; 113 } 114 daddr = &(u->sin6_addr); 115 iif = u->sin6_scope_id; 116 } else { 117 if (sk->sk_state != TCP_ESTABLISHED) 118 return -EDESTADDRREQ; 119 daddr = &sk->sk_v6_daddr; 120 } 121 122 if (!iif) 123 iif = sk->sk_bound_dev_if; 124 125 addr_type = ipv6_addr_type(daddr); 126 if (__ipv6_addr_needs_scope_id(addr_type) && !iif) 127 return -EINVAL; 128 if (addr_type & IPV6_ADDR_MAPPED) 129 return -EINVAL; 130 131 /* TODO: use ip6_datagram_send_ctl to get options from cmsg */ 132 133 memset(&fl6, 0, sizeof(fl6)); 134 135 fl6.flowi6_proto = IPPROTO_ICMPV6; 136 fl6.saddr = np->saddr; 137 fl6.daddr = *daddr; 138 fl6.fl6_icmp_type = user_icmph.icmp6_type; 139 fl6.fl6_icmp_code = user_icmph.icmp6_code; 140 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 141 142 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 143 fl6.flowi6_oif = np->mcast_oif; 144 else if (!fl6.flowi6_oif) 145 fl6.flowi6_oif = np->ucast_oif; 146 147 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr); 148 if (IS_ERR(dst)) 149 return PTR_ERR(dst); 150 rt = (struct rt6_info *) dst; 151 152 np = inet6_sk(sk); 153 if (!np) 154 return -EBADF; 155 156 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 157 fl6.flowi6_oif = np->mcast_oif; 158 else if (!fl6.flowi6_oif) 159 fl6.flowi6_oif = np->ucast_oif; 160 161 pfh.icmph.type = user_icmph.icmp6_type; 162 pfh.icmph.code = user_icmph.icmp6_code; 163 pfh.icmph.checksum = 0; 164 pfh.icmph.un.echo.id = inet->inet_sport; 165 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence; 166 pfh.iov = msg->msg_iov; 167 pfh.wcheck = 0; 168 pfh.family = AF_INET6; 169 170 if (ipv6_addr_is_multicast(&fl6.daddr)) 171 hlimit = np->mcast_hops; 172 else 173 hlimit = np->hop_limit; 174 if (hlimit < 0) 175 hlimit = ip6_dst_hoplimit(dst); 176 177 lock_sock(sk); 178 err = ip6_append_data(sk, ping_getfrag, &pfh, len, 179 0, hlimit, 180 np->tclass, NULL, &fl6, rt, 181 MSG_DONTWAIT, np->dontfrag); 182 183 if (err) { 184 ICMP6_INC_STATS_BH(sock_net(sk), rt->rt6i_idev, 185 ICMP6_MIB_OUTERRORS); 186 ip6_flush_pending_frames(sk); 187 } else { 188 err = icmpv6_push_pending_frames(sk, &fl6, 189 (struct icmp6hdr *) &pfh.icmph, 190 len); 191 } 192 release_sock(sk); 193 194 if (err) 195 return err; 196 197 return len; 198 } 199 200 #ifdef CONFIG_PROC_FS 201 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos) 202 { 203 return ping_seq_start(seq, pos, AF_INET6); 204 } 205 206 static int ping_v6_seq_show(struct seq_file *seq, void *v) 207 { 208 if (v == SEQ_START_TOKEN) { 209 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 210 } else { 211 int bucket = ((struct ping_iter_state *) seq->private)->bucket; 212 struct inet_sock *inet = inet_sk(v); 213 __u16 srcp = ntohs(inet->inet_sport); 214 __u16 destp = ntohs(inet->inet_dport); 215 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 216 } 217 return 0; 218 } 219 220 static struct ping_seq_afinfo ping_v6_seq_afinfo = { 221 .name = "icmp6", 222 .family = AF_INET6, 223 .seq_fops = &ping_seq_fops, 224 .seq_ops = { 225 .start = ping_v6_seq_start, 226 .show = ping_v6_seq_show, 227 .next = ping_seq_next, 228 .stop = ping_seq_stop, 229 }, 230 }; 231 232 static int __net_init ping_v6_proc_init_net(struct net *net) 233 { 234 return ping_proc_register(net, &ping_v6_seq_afinfo); 235 } 236 237 static void __net_init ping_v6_proc_exit_net(struct net *net) 238 { 239 return ping_proc_unregister(net, &ping_v6_seq_afinfo); 240 } 241 242 static struct pernet_operations ping_v6_net_ops = { 243 .init = ping_v6_proc_init_net, 244 .exit = ping_v6_proc_exit_net, 245 }; 246 #endif 247 248 int __init pingv6_init(void) 249 { 250 #ifdef CONFIG_PROC_FS 251 int ret = register_pernet_subsys(&ping_v6_net_ops); 252 if (ret) 253 return ret; 254 #endif 255 pingv6_ops.ipv6_recv_error = ipv6_recv_error; 256 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl; 257 pingv6_ops.ip6_datagram_recv_specific_ctl = 258 ip6_datagram_recv_specific_ctl; 259 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert; 260 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error; 261 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr; 262 return inet6_register_protosw(&pingv6_protosw); 263 } 264 265 /* This never gets called because it's not possible to unload the ipv6 module, 266 * but just in case. 267 */ 268 void pingv6_exit(void) 269 { 270 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error; 271 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl; 272 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl; 273 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert; 274 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error; 275 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr; 276 #ifdef CONFIG_PROC_FS 277 unregister_pernet_subsys(&ping_v6_net_ops); 278 #endif 279 inet6_unregister_protosw(&pingv6_protosw); 280 } 281