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 /* Compatibility glue so we can support IPv6 when it's compiled as a module */ 30 static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 31 int *addr_len) 32 { 33 return -EAFNOSUPPORT; 34 } 35 static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 36 struct sk_buff *skb) 37 { 38 } 39 static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err) 40 { 41 return -EAFNOSUPPORT; 42 } 43 static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 44 __be16 port, u32 info, u8 *payload) {} 45 static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 46 const struct net_device *dev, int strict) 47 { 48 return 0; 49 } 50 51 static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 52 { 53 struct inet_sock *inet = inet_sk(sk); 54 struct ipv6_pinfo *np = inet6_sk(sk); 55 struct icmp6hdr user_icmph; 56 int addr_type; 57 struct in6_addr *daddr; 58 int oif = 0; 59 struct flowi6 fl6; 60 int err; 61 struct dst_entry *dst; 62 struct rt6_info *rt; 63 struct pingfakehdr pfh; 64 struct sockcm_cookie junk = {0}; 65 struct ipcm6_cookie ipc6; 66 67 pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); 68 69 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph, 70 sizeof(user_icmph)); 71 if (err) 72 return err; 73 74 if (msg->msg_name) { 75 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name); 76 if (msg->msg_namelen < sizeof(*u)) 77 return -EINVAL; 78 if (u->sin6_family != AF_INET6) { 79 return -EAFNOSUPPORT; 80 } 81 daddr = &(u->sin6_addr); 82 if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr))) 83 oif = u->sin6_scope_id; 84 } else { 85 if (sk->sk_state != TCP_ESTABLISHED) 86 return -EDESTADDRREQ; 87 daddr = &sk->sk_v6_daddr; 88 } 89 90 if (!oif) 91 oif = sk->sk_bound_dev_if; 92 93 if (!oif) 94 oif = np->sticky_pktinfo.ipi6_ifindex; 95 96 if (!oif && ipv6_addr_is_multicast(daddr)) 97 oif = np->mcast_oif; 98 else if (!oif) 99 oif = np->ucast_oif; 100 101 addr_type = ipv6_addr_type(daddr); 102 if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) || 103 (addr_type & IPV6_ADDR_MAPPED) || 104 (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if)) 105 return -EINVAL; 106 107 /* TODO: use ip6_datagram_send_ctl to get options from cmsg */ 108 109 memset(&fl6, 0, sizeof(fl6)); 110 111 fl6.flowi6_proto = IPPROTO_ICMPV6; 112 fl6.saddr = np->saddr; 113 fl6.daddr = *daddr; 114 fl6.flowi6_oif = oif; 115 fl6.flowi6_mark = sk->sk_mark; 116 fl6.fl6_icmp_type = user_icmph.icmp6_type; 117 fl6.fl6_icmp_code = user_icmph.icmp6_code; 118 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 119 120 ipc6.tclass = np->tclass; 121 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 122 123 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr); 124 if (IS_ERR(dst)) 125 return PTR_ERR(dst); 126 rt = (struct rt6_info *) dst; 127 128 np = inet6_sk(sk); 129 if (!np) { 130 err = -EBADF; 131 goto dst_err_out; 132 } 133 134 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 135 fl6.flowi6_oif = np->mcast_oif; 136 else if (!fl6.flowi6_oif) 137 fl6.flowi6_oif = np->ucast_oif; 138 139 pfh.icmph.type = user_icmph.icmp6_type; 140 pfh.icmph.code = user_icmph.icmp6_code; 141 pfh.icmph.checksum = 0; 142 pfh.icmph.un.echo.id = inet->inet_sport; 143 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence; 144 pfh.msg = msg; 145 pfh.wcheck = 0; 146 pfh.family = AF_INET6; 147 148 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 149 ipc6.dontfrag = np->dontfrag; 150 ipc6.opt = NULL; 151 152 lock_sock(sk); 153 err = ip6_append_data(sk, ping_getfrag, &pfh, len, 154 0, &ipc6, &fl6, rt, 155 MSG_DONTWAIT, &junk); 156 157 if (err) { 158 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev, 159 ICMP6_MIB_OUTERRORS); 160 ip6_flush_pending_frames(sk); 161 } else { 162 err = icmpv6_push_pending_frames(sk, &fl6, 163 (struct icmp6hdr *) &pfh.icmph, 164 len); 165 } 166 release_sock(sk); 167 168 dst_err_out: 169 dst_release(dst); 170 171 if (err) 172 return err; 173 174 return len; 175 } 176 177 struct proto pingv6_prot = { 178 .name = "PINGv6", 179 .owner = THIS_MODULE, 180 .init = ping_init_sock, 181 .close = ping_close, 182 .connect = ip6_datagram_connect_v6_only, 183 .disconnect = __udp_disconnect, 184 .setsockopt = ipv6_setsockopt, 185 .getsockopt = ipv6_getsockopt, 186 .sendmsg = ping_v6_sendmsg, 187 .recvmsg = ping_recvmsg, 188 .bind = ping_bind, 189 .backlog_rcv = ping_queue_rcv_skb, 190 .hash = ping_hash, 191 .unhash = ping_unhash, 192 .get_port = ping_get_port, 193 .obj_size = sizeof(struct raw6_sock), 194 }; 195 EXPORT_SYMBOL_GPL(pingv6_prot); 196 197 static struct inet_protosw pingv6_protosw = { 198 .type = SOCK_DGRAM, 199 .protocol = IPPROTO_ICMPV6, 200 .prot = &pingv6_prot, 201 .ops = &inet6_dgram_ops, 202 .flags = INET_PROTOSW_REUSE, 203 }; 204 205 #ifdef CONFIG_PROC_FS 206 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos) 207 { 208 return ping_seq_start(seq, pos, AF_INET6); 209 } 210 211 static int ping_v6_seq_show(struct seq_file *seq, void *v) 212 { 213 if (v == SEQ_START_TOKEN) { 214 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 215 } else { 216 int bucket = ((struct ping_iter_state *) seq->private)->bucket; 217 struct inet_sock *inet = inet_sk(v); 218 __u16 srcp = ntohs(inet->inet_sport); 219 __u16 destp = ntohs(inet->inet_dport); 220 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 221 } 222 return 0; 223 } 224 225 static struct ping_seq_afinfo ping_v6_seq_afinfo = { 226 .name = "icmp6", 227 .family = AF_INET6, 228 .seq_fops = &ping_seq_fops, 229 .seq_ops = { 230 .start = ping_v6_seq_start, 231 .show = ping_v6_seq_show, 232 .next = ping_seq_next, 233 .stop = ping_seq_stop, 234 }, 235 }; 236 237 static int __net_init ping_v6_proc_init_net(struct net *net) 238 { 239 return ping_proc_register(net, &ping_v6_seq_afinfo); 240 } 241 242 static void __net_init ping_v6_proc_exit_net(struct net *net) 243 { 244 return ping_proc_unregister(net, &ping_v6_seq_afinfo); 245 } 246 247 static struct pernet_operations ping_v6_net_ops = { 248 .init = ping_v6_proc_init_net, 249 .exit = ping_v6_proc_exit_net, 250 }; 251 #endif 252 253 int __init pingv6_init(void) 254 { 255 #ifdef CONFIG_PROC_FS 256 int ret = register_pernet_subsys(&ping_v6_net_ops); 257 if (ret) 258 return ret; 259 #endif 260 pingv6_ops.ipv6_recv_error = ipv6_recv_error; 261 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl; 262 pingv6_ops.ip6_datagram_recv_specific_ctl = 263 ip6_datagram_recv_specific_ctl; 264 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert; 265 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error; 266 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr; 267 return inet6_register_protosw(&pingv6_protosw); 268 } 269 270 /* This never gets called because it's not possible to unload the ipv6 module, 271 * but just in case. 272 */ 273 void pingv6_exit(void) 274 { 275 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error; 276 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl; 277 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl; 278 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert; 279 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error; 280 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr; 281 #ifdef CONFIG_PROC_FS 282 unregister_pernet_subsys(&ping_v6_net_ops); 283 #endif 284 inet6_unregister_protosw(&pingv6_protosw); 285 } 286