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 <linux/proc_fs.h> 28 #include <net/ping.h> 29 30 /* Compatibility glue so we can support IPv6 when it's compiled as a module */ 31 static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 32 int *addr_len) 33 { 34 return -EAFNOSUPPORT; 35 } 36 static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 37 struct sk_buff *skb) 38 { 39 } 40 static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err) 41 { 42 return -EAFNOSUPPORT; 43 } 44 static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 45 __be16 port, u32 info, u8 *payload) {} 46 static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 47 const struct net_device *dev, int strict) 48 { 49 return 0; 50 } 51 52 static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 53 { 54 struct inet_sock *inet = inet_sk(sk); 55 struct ipv6_pinfo *np = inet6_sk(sk); 56 struct icmp6hdr user_icmph; 57 int addr_type; 58 struct in6_addr *daddr; 59 int oif = 0; 60 struct flowi6 fl6; 61 int err; 62 struct dst_entry *dst; 63 struct rt6_info *rt; 64 struct pingfakehdr pfh; 65 struct sockcm_cookie junk = {0}; 66 struct ipcm6_cookie ipc6; 67 68 pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); 69 70 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph, 71 sizeof(user_icmph)); 72 if (err) 73 return err; 74 75 if (msg->msg_name) { 76 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name); 77 if (msg->msg_namelen < sizeof(*u)) 78 return -EINVAL; 79 if (u->sin6_family != AF_INET6) { 80 return -EAFNOSUPPORT; 81 } 82 daddr = &(u->sin6_addr); 83 if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr))) 84 oif = u->sin6_scope_id; 85 } else { 86 if (sk->sk_state != TCP_ESTABLISHED) 87 return -EDESTADDRREQ; 88 daddr = &sk->sk_v6_daddr; 89 } 90 91 if (!oif) 92 oif = sk->sk_bound_dev_if; 93 94 if (!oif) 95 oif = np->sticky_pktinfo.ipi6_ifindex; 96 97 if (!oif && ipv6_addr_is_multicast(daddr)) 98 oif = np->mcast_oif; 99 else if (!oif) 100 oif = np->ucast_oif; 101 102 addr_type = ipv6_addr_type(daddr); 103 if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) || 104 (addr_type & IPV6_ADDR_MAPPED) || 105 (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if)) 106 return -EINVAL; 107 108 /* TODO: use ip6_datagram_send_ctl to get options from cmsg */ 109 110 memset(&fl6, 0, sizeof(fl6)); 111 112 fl6.flowi6_proto = IPPROTO_ICMPV6; 113 fl6.saddr = np->saddr; 114 fl6.daddr = *daddr; 115 fl6.flowi6_oif = oif; 116 fl6.flowi6_mark = sk->sk_mark; 117 fl6.flowi6_uid = sk->sk_uid; 118 fl6.fl6_icmp_type = user_icmph.icmp6_type; 119 fl6.fl6_icmp_code = user_icmph.icmp6_code; 120 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 121 122 ipc6.tclass = np->tclass; 123 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 124 125 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false); 126 if (IS_ERR(dst)) 127 return PTR_ERR(dst); 128 rt = (struct rt6_info *) dst; 129 130 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 131 fl6.flowi6_oif = np->mcast_oif; 132 else if (!fl6.flowi6_oif) 133 fl6.flowi6_oif = np->ucast_oif; 134 135 pfh.icmph.type = user_icmph.icmp6_type; 136 pfh.icmph.code = user_icmph.icmp6_code; 137 pfh.icmph.checksum = 0; 138 pfh.icmph.un.echo.id = inet->inet_sport; 139 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence; 140 pfh.msg = msg; 141 pfh.wcheck = 0; 142 pfh.family = AF_INET6; 143 144 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 145 ipc6.dontfrag = np->dontfrag; 146 ipc6.opt = NULL; 147 148 lock_sock(sk); 149 err = ip6_append_data(sk, ping_getfrag, &pfh, len, 150 0, &ipc6, &fl6, rt, 151 MSG_DONTWAIT, &junk); 152 153 if (err) { 154 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev, 155 ICMP6_MIB_OUTERRORS); 156 ip6_flush_pending_frames(sk); 157 } else { 158 icmpv6_push_pending_frames(sk, &fl6, 159 (struct icmp6hdr *)&pfh.icmph, len); 160 } 161 release_sock(sk); 162 163 dst_release(dst); 164 165 if (err) 166 return err; 167 168 return len; 169 } 170 171 struct proto pingv6_prot = { 172 .name = "PINGv6", 173 .owner = THIS_MODULE, 174 .init = ping_init_sock, 175 .close = ping_close, 176 .connect = ip6_datagram_connect_v6_only, 177 .disconnect = __udp_disconnect, 178 .setsockopt = ipv6_setsockopt, 179 .getsockopt = ipv6_getsockopt, 180 .sendmsg = ping_v6_sendmsg, 181 .recvmsg = ping_recvmsg, 182 .bind = ping_bind, 183 .backlog_rcv = ping_queue_rcv_skb, 184 .hash = ping_hash, 185 .unhash = ping_unhash, 186 .get_port = ping_get_port, 187 .obj_size = sizeof(struct raw6_sock), 188 }; 189 EXPORT_SYMBOL_GPL(pingv6_prot); 190 191 static struct inet_protosw pingv6_protosw = { 192 .type = SOCK_DGRAM, 193 .protocol = IPPROTO_ICMPV6, 194 .prot = &pingv6_prot, 195 .ops = &inet6_sockraw_ops, 196 .flags = INET_PROTOSW_REUSE, 197 }; 198 199 #ifdef CONFIG_PROC_FS 200 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos) 201 { 202 return ping_seq_start(seq, pos, AF_INET6); 203 } 204 205 static int ping_v6_seq_show(struct seq_file *seq, void *v) 206 { 207 if (v == SEQ_START_TOKEN) { 208 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 209 } else { 210 int bucket = ((struct ping_iter_state *) seq->private)->bucket; 211 struct inet_sock *inet = inet_sk(v); 212 __u16 srcp = ntohs(inet->inet_sport); 213 __u16 destp = ntohs(inet->inet_dport); 214 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 215 } 216 return 0; 217 } 218 219 static const struct seq_operations ping_v6_seq_ops = { 220 .start = ping_v6_seq_start, 221 .show = ping_v6_seq_show, 222 .next = ping_seq_next, 223 .stop = ping_seq_stop, 224 }; 225 226 static int __net_init ping_v6_proc_init_net(struct net *net) 227 { 228 if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops, 229 sizeof(struct ping_iter_state))) 230 return -ENOMEM; 231 return 0; 232 } 233 234 static void __net_init ping_v6_proc_exit_net(struct net *net) 235 { 236 remove_proc_entry("icmp6", net->proc_net); 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