1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * "Ping" sockets 8 * 9 * Based on ipv4/ping.c code. 10 * 11 * Authors: Lorenzo Colitti (IPv6 support) 12 * Vasiliy Kulikov / Openwall (IPv4 implementation, for Linux 2.6), 13 * Pavel Kankovsky (IPv4 implementation, for Linux 2.4.32) 14 */ 15 16 #include <net/addrconf.h> 17 #include <net/ipv6.h> 18 #include <net/ip6_route.h> 19 #include <net/protocol.h> 20 #include <net/udp.h> 21 #include <net/transp_v6.h> 22 #include <linux/proc_fs.h> 23 #include <net/ping.h> 24 25 /* Compatibility glue so we can support IPv6 when it's compiled as a module */ 26 static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 27 int *addr_len) 28 { 29 return -EAFNOSUPPORT; 30 } 31 static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 32 struct sk_buff *skb) 33 { 34 } 35 static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err) 36 { 37 return -EAFNOSUPPORT; 38 } 39 static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 40 __be16 port, u32 info, u8 *payload) {} 41 static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 42 const struct net_device *dev, int strict) 43 { 44 return 0; 45 } 46 47 static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 48 { 49 struct inet_sock *inet = inet_sk(sk); 50 struct ipv6_pinfo *np = inet6_sk(sk); 51 struct icmp6hdr user_icmph; 52 int addr_type; 53 struct in6_addr *daddr; 54 int oif = 0; 55 struct flowi6 fl6; 56 int err; 57 struct dst_entry *dst; 58 struct rt6_info *rt; 59 struct pingfakehdr pfh; 60 struct ipcm6_cookie ipc6; 61 62 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph, 63 sizeof(user_icmph)); 64 if (err) 65 return err; 66 67 if (msg->msg_name) { 68 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name); 69 if (msg->msg_namelen < sizeof(*u)) 70 return -EINVAL; 71 if (u->sin6_family != AF_INET6) { 72 return -EAFNOSUPPORT; 73 } 74 daddr = &(u->sin6_addr); 75 if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr))) 76 oif = u->sin6_scope_id; 77 } else { 78 if (sk->sk_state != TCP_ESTABLISHED) 79 return -EDESTADDRREQ; 80 daddr = &sk->sk_v6_daddr; 81 } 82 83 if (!oif) 84 oif = sk->sk_bound_dev_if; 85 86 if (!oif) 87 oif = np->sticky_pktinfo.ipi6_ifindex; 88 89 if (!oif && ipv6_addr_is_multicast(daddr)) 90 oif = np->mcast_oif; 91 else if (!oif) 92 oif = np->ucast_oif; 93 94 addr_type = ipv6_addr_type(daddr); 95 if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) || 96 (addr_type & IPV6_ADDR_MAPPED) || 97 (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if)) 98 return -EINVAL; 99 100 ipcm6_init_sk(&ipc6, np); 101 ipc6.sockc.tsflags = sk->sk_tsflags; 102 ipc6.sockc.mark = sk->sk_mark; 103 104 if (msg->msg_controllen) { 105 struct ipv6_txoptions opt = {}; 106 107 opt.tot_len = sizeof(opt); 108 ipc6.opt = &opt; 109 110 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6); 111 if (err < 0) 112 return err; 113 114 /* Changes to txoptions and flow info are not implemented, yet. 115 * Drop the options, fl6 is wiped below. 116 */ 117 ipc6.opt = NULL; 118 } 119 120 memset(&fl6, 0, sizeof(fl6)); 121 122 fl6.flowi6_proto = IPPROTO_ICMPV6; 123 fl6.saddr = np->saddr; 124 fl6.daddr = *daddr; 125 fl6.flowi6_oif = oif; 126 fl6.flowi6_mark = ipc6.sockc.mark; 127 fl6.flowi6_uid = sk->sk_uid; 128 fl6.fl6_icmp_type = user_icmph.icmp6_type; 129 fl6.fl6_icmp_code = user_icmph.icmp6_code; 130 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); 131 132 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 133 134 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false); 135 if (IS_ERR(dst)) 136 return PTR_ERR(dst); 137 rt = (struct rt6_info *) dst; 138 139 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 140 fl6.flowi6_oif = np->mcast_oif; 141 else if (!fl6.flowi6_oif) 142 fl6.flowi6_oif = np->ucast_oif; 143 144 pfh.icmph.type = user_icmph.icmp6_type; 145 pfh.icmph.code = user_icmph.icmp6_code; 146 pfh.icmph.checksum = 0; 147 pfh.icmph.un.echo.id = inet->inet_sport; 148 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence; 149 pfh.msg = msg; 150 pfh.wcheck = 0; 151 pfh.family = AF_INET6; 152 153 if (ipc6.hlimit < 0) 154 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 155 156 lock_sock(sk); 157 err = ip6_append_data(sk, ping_getfrag, &pfh, len, 158 0, &ipc6, &fl6, rt, 159 MSG_DONTWAIT); 160 161 if (err) { 162 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev, 163 ICMP6_MIB_OUTERRORS); 164 ip6_flush_pending_frames(sk); 165 } else { 166 icmpv6_push_pending_frames(sk, &fl6, 167 (struct icmp6hdr *)&pfh.icmph, len); 168 } 169 release_sock(sk); 170 171 dst_release(dst); 172 173 if (err) 174 return err; 175 176 return len; 177 } 178 179 struct proto pingv6_prot = { 180 .name = "PINGv6", 181 .owner = THIS_MODULE, 182 .init = ping_init_sock, 183 .close = ping_close, 184 .connect = ip6_datagram_connect_v6_only, 185 .disconnect = __udp_disconnect, 186 .setsockopt = ipv6_setsockopt, 187 .getsockopt = ipv6_getsockopt, 188 .sendmsg = ping_v6_sendmsg, 189 .recvmsg = ping_recvmsg, 190 .bind = ping_bind, 191 .backlog_rcv = ping_queue_rcv_skb, 192 .hash = ping_hash, 193 .unhash = ping_unhash, 194 .get_port = ping_get_port, 195 .put_port = ping_unhash, 196 .obj_size = sizeof(struct raw6_sock), 197 }; 198 EXPORT_SYMBOL_GPL(pingv6_prot); 199 200 static struct inet_protosw pingv6_protosw = { 201 .type = SOCK_DGRAM, 202 .protocol = IPPROTO_ICMPV6, 203 .prot = &pingv6_prot, 204 .ops = &inet6_sockraw_ops, 205 .flags = INET_PROTOSW_REUSE, 206 }; 207 208 #ifdef CONFIG_PROC_FS 209 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos) 210 { 211 return ping_seq_start(seq, pos, AF_INET6); 212 } 213 214 static int ping_v6_seq_show(struct seq_file *seq, void *v) 215 { 216 if (v == SEQ_START_TOKEN) { 217 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 218 } else { 219 int bucket = ((struct ping_iter_state *) seq->private)->bucket; 220 struct inet_sock *inet = inet_sk(v); 221 __u16 srcp = ntohs(inet->inet_sport); 222 __u16 destp = ntohs(inet->inet_dport); 223 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 224 } 225 return 0; 226 } 227 228 static const struct seq_operations ping_v6_seq_ops = { 229 .start = ping_v6_seq_start, 230 .show = ping_v6_seq_show, 231 .next = ping_seq_next, 232 .stop = ping_seq_stop, 233 }; 234 235 static int __net_init ping_v6_proc_init_net(struct net *net) 236 { 237 if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops, 238 sizeof(struct ping_iter_state))) 239 return -ENOMEM; 240 return 0; 241 } 242 243 static void __net_exit ping_v6_proc_exit_net(struct net *net) 244 { 245 remove_proc_entry("icmp6", net->proc_net); 246 } 247 248 static struct pernet_operations ping_v6_net_ops = { 249 .init = ping_v6_proc_init_net, 250 .exit = ping_v6_proc_exit_net, 251 }; 252 #endif 253 254 int __init pingv6_init(void) 255 { 256 #ifdef CONFIG_PROC_FS 257 int ret = register_pernet_subsys(&ping_v6_net_ops); 258 if (ret) 259 return ret; 260 #endif 261 pingv6_ops.ipv6_recv_error = ipv6_recv_error; 262 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl; 263 pingv6_ops.ip6_datagram_recv_specific_ctl = 264 ip6_datagram_recv_specific_ctl; 265 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert; 266 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error; 267 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr; 268 return inet6_register_protosw(&pingv6_protosw); 269 } 270 271 /* This never gets called because it's not possible to unload the ipv6 module, 272 * but just in case. 273 */ 274 void pingv6_exit(void) 275 { 276 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error; 277 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl; 278 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl; 279 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert; 280 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error; 281 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr; 282 #ifdef CONFIG_PROC_FS 283 unregister_pernet_subsys(&ping_v6_net_ops); 284 #endif 285 inet6_unregister_protosw(&pingv6_protosw); 286 } 287