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