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 .flags = INET_PROTOSW_REUSE, 55 }; 56 57 58 /* Compatibility glue so we can support IPv6 when it's compiled as a module */ 59 static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 60 int *addr_len) 61 { 62 return -EAFNOSUPPORT; 63 } 64 static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 65 struct sk_buff *skb) 66 { 67 } 68 static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err) 69 { 70 return -EAFNOSUPPORT; 71 } 72 static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 73 __be16 port, u32 info, u8 *payload) {} 74 static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 75 const struct net_device *dev, int strict) 76 { 77 return 0; 78 } 79 80 int ping_v6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 81 size_t len) 82 { 83 struct inet_sock *inet = inet_sk(sk); 84 struct ipv6_pinfo *np = inet6_sk(sk); 85 struct icmp6hdr user_icmph; 86 int addr_type; 87 struct in6_addr *daddr; 88 int iif = 0; 89 struct flowi6 fl6; 90 int err; 91 int hlimit; 92 struct dst_entry *dst; 93 struct rt6_info *rt; 94 struct pingfakehdr pfh; 95 96 pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); 97 98 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph, 99 sizeof(user_icmph)); 100 if (err) 101 return err; 102 103 if (msg->msg_name) { 104 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name); 105 if (msg->msg_namelen < sizeof(struct sockaddr_in6) || 106 u->sin6_family != AF_INET6) { 107 return -EINVAL; 108 } 109 if (sk->sk_bound_dev_if && 110 sk->sk_bound_dev_if != u->sin6_scope_id) { 111 return -EINVAL; 112 } 113 daddr = &(u->sin6_addr); 114 iif = u->sin6_scope_id; 115 } else { 116 if (sk->sk_state != TCP_ESTABLISHED) 117 return -EDESTADDRREQ; 118 daddr = &sk->sk_v6_daddr; 119 } 120 121 if (!iif) 122 iif = sk->sk_bound_dev_if; 123 124 addr_type = ipv6_addr_type(daddr); 125 if (__ipv6_addr_needs_scope_id(addr_type) && !iif) 126 return -EINVAL; 127 if (addr_type & IPV6_ADDR_MAPPED) 128 return -EINVAL; 129 130 /* TODO: use ip6_datagram_send_ctl to get options from cmsg */ 131 132 memset(&fl6, 0, sizeof(fl6)); 133 134 fl6.flowi6_proto = IPPROTO_ICMPV6; 135 fl6.saddr = np->saddr; 136 fl6.daddr = *daddr; 137 fl6.flowi6_mark = sk->sk_mark; 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 /* XXX: stripping const */ 167 pfh.iov = (struct iovec *)msg->msg_iter.iov; 168 pfh.wcheck = 0; 169 pfh.family = AF_INET6; 170 171 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 172 173 lock_sock(sk); 174 err = ip6_append_data(sk, ping_getfrag, &pfh, len, 175 0, hlimit, 176 np->tclass, NULL, &fl6, rt, 177 MSG_DONTWAIT, np->dontfrag); 178 179 if (err) { 180 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev, 181 ICMP6_MIB_OUTERRORS); 182 ip6_flush_pending_frames(sk); 183 } else { 184 err = icmpv6_push_pending_frames(sk, &fl6, 185 (struct icmp6hdr *) &pfh.icmph, 186 len); 187 } 188 release_sock(sk); 189 190 if (err) 191 return err; 192 193 return len; 194 } 195 196 #ifdef CONFIG_PROC_FS 197 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos) 198 { 199 return ping_seq_start(seq, pos, AF_INET6); 200 } 201 202 static int ping_v6_seq_show(struct seq_file *seq, void *v) 203 { 204 if (v == SEQ_START_TOKEN) { 205 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 206 } else { 207 int bucket = ((struct ping_iter_state *) seq->private)->bucket; 208 struct inet_sock *inet = inet_sk(v); 209 __u16 srcp = ntohs(inet->inet_sport); 210 __u16 destp = ntohs(inet->inet_dport); 211 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 212 } 213 return 0; 214 } 215 216 static struct ping_seq_afinfo ping_v6_seq_afinfo = { 217 .name = "icmp6", 218 .family = AF_INET6, 219 .seq_fops = &ping_seq_fops, 220 .seq_ops = { 221 .start = ping_v6_seq_start, 222 .show = ping_v6_seq_show, 223 .next = ping_seq_next, 224 .stop = ping_seq_stop, 225 }, 226 }; 227 228 static int __net_init ping_v6_proc_init_net(struct net *net) 229 { 230 return ping_proc_register(net, &ping_v6_seq_afinfo); 231 } 232 233 static void __net_init ping_v6_proc_exit_net(struct net *net) 234 { 235 return ping_proc_unregister(net, &ping_v6_seq_afinfo); 236 } 237 238 static struct pernet_operations ping_v6_net_ops = { 239 .init = ping_v6_proc_init_net, 240 .exit = ping_v6_proc_exit_net, 241 }; 242 #endif 243 244 int __init pingv6_init(void) 245 { 246 #ifdef CONFIG_PROC_FS 247 int ret = register_pernet_subsys(&ping_v6_net_ops); 248 if (ret) 249 return ret; 250 #endif 251 pingv6_ops.ipv6_recv_error = ipv6_recv_error; 252 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl; 253 pingv6_ops.ip6_datagram_recv_specific_ctl = 254 ip6_datagram_recv_specific_ctl; 255 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert; 256 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error; 257 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr; 258 return inet6_register_protosw(&pingv6_protosw); 259 } 260 261 /* This never gets called because it's not possible to unload the ipv6 module, 262 * but just in case. 263 */ 264 void pingv6_exit(void) 265 { 266 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error; 267 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl; 268 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl; 269 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert; 270 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error; 271 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr; 272 #ifdef CONFIG_PROC_FS 273 unregister_pernet_subsys(&ping_v6_net_ops); 274 #endif 275 inet6_unregister_protosw(&pingv6_protosw); 276 } 277