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 static void ping_v6_destroy(struct sock *sk) 26 { 27 inet6_destroy_sock(sk); 28 } 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 ipcm6_cookie ipc6; 66 67 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph, 68 sizeof(user_icmph)); 69 if (err) 70 return err; 71 72 memset(&fl6, 0, sizeof(fl6)); 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 (np->sndflow) 83 fl6.flowlabel = u->sin6_flowinfo & IPV6_FLOWINFO_MASK; 84 if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr))) 85 oif = u->sin6_scope_id; 86 } else { 87 if (sk->sk_state != TCP_ESTABLISHED) 88 return -EDESTADDRREQ; 89 daddr = &sk->sk_v6_daddr; 90 fl6.flowlabel = np->flow_label; 91 } 92 93 if (!oif) 94 oif = sk->sk_bound_dev_if; 95 96 if (!oif) 97 oif = np->sticky_pktinfo.ipi6_ifindex; 98 99 if (!oif && ipv6_addr_is_multicast(daddr)) 100 oif = np->mcast_oif; 101 else if (!oif) 102 oif = np->ucast_oif; 103 104 addr_type = ipv6_addr_type(daddr); 105 if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) || 106 (addr_type & IPV6_ADDR_MAPPED) || 107 (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if)) 108 return -EINVAL; 109 110 ipcm6_init_sk(&ipc6, np); 111 ipc6.sockc.tsflags = sk->sk_tsflags; 112 ipc6.sockc.mark = sk->sk_mark; 113 114 fl6.flowi6_oif = oif; 115 116 if (msg->msg_controllen) { 117 struct ipv6_txoptions opt = {}; 118 119 opt.tot_len = sizeof(opt); 120 ipc6.opt = &opt; 121 122 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6); 123 if (err < 0) 124 return err; 125 126 /* Changes to txoptions and flow info are not implemented, yet. 127 * Drop the options. 128 */ 129 ipc6.opt = NULL; 130 } 131 132 fl6.flowi6_proto = IPPROTO_ICMPV6; 133 fl6.saddr = np->saddr; 134 fl6.daddr = *daddr; 135 fl6.flowi6_mark = ipc6.sockc.mark; 136 fl6.flowi6_uid = sk->sk_uid; 137 fl6.fl6_icmp_type = user_icmph.icmp6_type; 138 fl6.fl6_icmp_code = user_icmph.icmp6_code; 139 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); 140 141 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 142 143 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false); 144 if (IS_ERR(dst)) 145 return PTR_ERR(dst); 146 rt = (struct rt6_info *) dst; 147 148 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 149 fl6.flowi6_oif = np->mcast_oif; 150 else if (!fl6.flowi6_oif) 151 fl6.flowi6_oif = np->ucast_oif; 152 153 pfh.icmph.type = user_icmph.icmp6_type; 154 pfh.icmph.code = user_icmph.icmp6_code; 155 pfh.icmph.checksum = 0; 156 pfh.icmph.un.echo.id = inet->inet_sport; 157 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence; 158 pfh.msg = msg; 159 pfh.wcheck = 0; 160 pfh.family = AF_INET6; 161 162 if (ipc6.hlimit < 0) 163 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 164 165 lock_sock(sk); 166 err = ip6_append_data(sk, ping_getfrag, &pfh, len, 167 0, &ipc6, &fl6, rt, 168 MSG_DONTWAIT); 169 170 if (err) { 171 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev, 172 ICMP6_MIB_OUTERRORS); 173 ip6_flush_pending_frames(sk); 174 } else { 175 icmpv6_push_pending_frames(sk, &fl6, 176 (struct icmp6hdr *)&pfh.icmph, len); 177 } 178 release_sock(sk); 179 180 dst_release(dst); 181 182 if (err) 183 return err; 184 185 return len; 186 } 187 188 struct proto pingv6_prot = { 189 .name = "PINGv6", 190 .owner = THIS_MODULE, 191 .init = ping_init_sock, 192 .close = ping_close, 193 .destroy = ping_v6_destroy, 194 .connect = ip6_datagram_connect_v6_only, 195 .disconnect = __udp_disconnect, 196 .setsockopt = ipv6_setsockopt, 197 .getsockopt = ipv6_getsockopt, 198 .sendmsg = ping_v6_sendmsg, 199 .recvmsg = ping_recvmsg, 200 .bind = ping_bind, 201 .backlog_rcv = ping_queue_rcv_skb, 202 .hash = ping_hash, 203 .unhash = ping_unhash, 204 .get_port = ping_get_port, 205 .put_port = ping_unhash, 206 .obj_size = sizeof(struct raw6_sock), 207 }; 208 EXPORT_SYMBOL_GPL(pingv6_prot); 209 210 static struct inet_protosw pingv6_protosw = { 211 .type = SOCK_DGRAM, 212 .protocol = IPPROTO_ICMPV6, 213 .prot = &pingv6_prot, 214 .ops = &inet6_sockraw_ops, 215 .flags = INET_PROTOSW_REUSE, 216 }; 217 218 #ifdef CONFIG_PROC_FS 219 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos) 220 { 221 return ping_seq_start(seq, pos, AF_INET6); 222 } 223 224 static int ping_v6_seq_show(struct seq_file *seq, void *v) 225 { 226 if (v == SEQ_START_TOKEN) { 227 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 228 } else { 229 int bucket = ((struct ping_iter_state *) seq->private)->bucket; 230 struct inet_sock *inet = inet_sk(v); 231 __u16 srcp = ntohs(inet->inet_sport); 232 __u16 destp = ntohs(inet->inet_dport); 233 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 234 } 235 return 0; 236 } 237 238 static const struct seq_operations ping_v6_seq_ops = { 239 .start = ping_v6_seq_start, 240 .show = ping_v6_seq_show, 241 .next = ping_seq_next, 242 .stop = ping_seq_stop, 243 }; 244 245 static int __net_init ping_v6_proc_init_net(struct net *net) 246 { 247 if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops, 248 sizeof(struct ping_iter_state))) 249 return -ENOMEM; 250 return 0; 251 } 252 253 static void __net_exit ping_v6_proc_exit_net(struct net *net) 254 { 255 remove_proc_entry("icmp6", net->proc_net); 256 } 257 258 static struct pernet_operations ping_v6_net_ops = { 259 .init = ping_v6_proc_init_net, 260 .exit = ping_v6_proc_exit_net, 261 }; 262 #endif 263 264 int __init pingv6_init(void) 265 { 266 #ifdef CONFIG_PROC_FS 267 int ret = register_pernet_subsys(&ping_v6_net_ops); 268 if (ret) 269 return ret; 270 #endif 271 pingv6_ops.ipv6_recv_error = ipv6_recv_error; 272 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl; 273 pingv6_ops.ip6_datagram_recv_specific_ctl = 274 ip6_datagram_recv_specific_ctl; 275 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert; 276 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error; 277 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr; 278 return inet6_register_protosw(&pingv6_protosw); 279 } 280 281 /* This never gets called because it's not possible to unload the ipv6 module, 282 * but just in case. 283 */ 284 void pingv6_exit(void) 285 { 286 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error; 287 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl; 288 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl; 289 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert; 290 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error; 291 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr; 292 #ifdef CONFIG_PROC_FS 293 unregister_pernet_subsys(&ping_v6_net_ops); 294 #endif 295 inet6_unregister_protosw(&pingv6_protosw); 296 } 297