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 iif = 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 if (sk->sk_bound_dev_if && 82 sk->sk_bound_dev_if != u->sin6_scope_id) { 83 return -EINVAL; 84 } 85 daddr = &(u->sin6_addr); 86 iif = u->sin6_scope_id; 87 } else { 88 if (sk->sk_state != TCP_ESTABLISHED) 89 return -EDESTADDRREQ; 90 daddr = &sk->sk_v6_daddr; 91 } 92 93 if (!iif) 94 iif = sk->sk_bound_dev_if; 95 96 addr_type = ipv6_addr_type(daddr); 97 if (__ipv6_addr_needs_scope_id(addr_type) && !iif) 98 return -EINVAL; 99 if (addr_type & IPV6_ADDR_MAPPED) 100 return -EINVAL; 101 102 /* TODO: use ip6_datagram_send_ctl to get options from cmsg */ 103 104 memset(&fl6, 0, sizeof(fl6)); 105 106 fl6.flowi6_proto = IPPROTO_ICMPV6; 107 fl6.saddr = np->saddr; 108 fl6.daddr = *daddr; 109 fl6.flowi6_mark = sk->sk_mark; 110 fl6.fl6_icmp_type = user_icmph.icmp6_type; 111 fl6.fl6_icmp_code = user_icmph.icmp6_code; 112 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 113 114 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 115 fl6.flowi6_oif = np->mcast_oif; 116 else if (!fl6.flowi6_oif) 117 fl6.flowi6_oif = np->ucast_oif; 118 119 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr); 120 if (IS_ERR(dst)) 121 return PTR_ERR(dst); 122 rt = (struct rt6_info *) dst; 123 124 np = inet6_sk(sk); 125 if (!np) 126 return -EBADF; 127 128 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 129 fl6.flowi6_oif = np->mcast_oif; 130 else if (!fl6.flowi6_oif) 131 fl6.flowi6_oif = np->ucast_oif; 132 133 pfh.icmph.type = user_icmph.icmp6_type; 134 pfh.icmph.code = user_icmph.icmp6_code; 135 pfh.icmph.checksum = 0; 136 pfh.icmph.un.echo.id = inet->inet_sport; 137 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence; 138 pfh.msg = msg; 139 pfh.wcheck = 0; 140 pfh.family = AF_INET6; 141 142 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 143 ipc6.tclass = np->tclass; 144 ipc6.dontfrag = np->dontfrag; 145 ipc6.opt = NULL; 146 147 lock_sock(sk); 148 err = ip6_append_data(sk, ping_getfrag, &pfh, len, 149 0, &ipc6, &fl6, rt, 150 MSG_DONTWAIT, &junk); 151 152 if (err) { 153 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev, 154 ICMP6_MIB_OUTERRORS); 155 ip6_flush_pending_frames(sk); 156 } else { 157 err = icmpv6_push_pending_frames(sk, &fl6, 158 (struct icmp6hdr *) &pfh.icmph, 159 len); 160 } 161 release_sock(sk); 162 163 if (err) 164 return err; 165 166 return len; 167 } 168 169 struct proto pingv6_prot = { 170 .name = "PINGv6", 171 .owner = THIS_MODULE, 172 .init = ping_init_sock, 173 .close = ping_close, 174 .connect = ip6_datagram_connect_v6_only, 175 .disconnect = udp_disconnect, 176 .setsockopt = ipv6_setsockopt, 177 .getsockopt = ipv6_getsockopt, 178 .sendmsg = ping_v6_sendmsg, 179 .recvmsg = ping_recvmsg, 180 .bind = ping_bind, 181 .backlog_rcv = ping_queue_rcv_skb, 182 .hash = ping_hash, 183 .unhash = ping_unhash, 184 .get_port = ping_get_port, 185 .obj_size = sizeof(struct raw6_sock), 186 }; 187 EXPORT_SYMBOL_GPL(pingv6_prot); 188 189 static struct inet_protosw pingv6_protosw = { 190 .type = SOCK_DGRAM, 191 .protocol = IPPROTO_ICMPV6, 192 .prot = &pingv6_prot, 193 .ops = &inet6_dgram_ops, 194 .flags = INET_PROTOSW_REUSE, 195 }; 196 197 #ifdef CONFIG_PROC_FS 198 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos) 199 { 200 return ping_seq_start(seq, pos, AF_INET6); 201 } 202 203 static int ping_v6_seq_show(struct seq_file *seq, void *v) 204 { 205 if (v == SEQ_START_TOKEN) { 206 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 207 } else { 208 int bucket = ((struct ping_iter_state *) seq->private)->bucket; 209 struct inet_sock *inet = inet_sk(v); 210 __u16 srcp = ntohs(inet->inet_sport); 211 __u16 destp = ntohs(inet->inet_dport); 212 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 213 } 214 return 0; 215 } 216 217 static struct ping_seq_afinfo ping_v6_seq_afinfo = { 218 .name = "icmp6", 219 .family = AF_INET6, 220 .seq_fops = &ping_seq_fops, 221 .seq_ops = { 222 .start = ping_v6_seq_start, 223 .show = ping_v6_seq_show, 224 .next = ping_seq_next, 225 .stop = ping_seq_stop, 226 }, 227 }; 228 229 static int __net_init ping_v6_proc_init_net(struct net *net) 230 { 231 return ping_proc_register(net, &ping_v6_seq_afinfo); 232 } 233 234 static void __net_init ping_v6_proc_exit_net(struct net *net) 235 { 236 return ping_proc_unregister(net, &ping_v6_seq_afinfo); 237 } 238 239 static struct pernet_operations ping_v6_net_ops = { 240 .init = ping_v6_proc_init_net, 241 .exit = ping_v6_proc_exit_net, 242 }; 243 #endif 244 245 int __init pingv6_init(void) 246 { 247 #ifdef CONFIG_PROC_FS 248 int ret = register_pernet_subsys(&ping_v6_net_ops); 249 if (ret) 250 return ret; 251 #endif 252 pingv6_ops.ipv6_recv_error = ipv6_recv_error; 253 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl; 254 pingv6_ops.ip6_datagram_recv_specific_ctl = 255 ip6_datagram_recv_specific_ctl; 256 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert; 257 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error; 258 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr; 259 return inet6_register_protosw(&pingv6_protosw); 260 } 261 262 /* This never gets called because it's not possible to unload the ipv6 module, 263 * but just in case. 264 */ 265 void pingv6_exit(void) 266 { 267 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error; 268 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl; 269 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl; 270 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert; 271 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error; 272 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr; 273 #ifdef CONFIG_PROC_FS 274 unregister_pernet_subsys(&ping_v6_net_ops); 275 #endif 276 inet6_unregister_protosw(&pingv6_protosw); 277 } 278