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 if (msg->msg_name) { 73 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name); 74 if (msg->msg_namelen < sizeof(*u)) 75 return -EINVAL; 76 if (u->sin6_family != AF_INET6) { 77 return -EAFNOSUPPORT; 78 } 79 daddr = &(u->sin6_addr); 80 if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr))) 81 oif = u->sin6_scope_id; 82 } else { 83 if (sk->sk_state != TCP_ESTABLISHED) 84 return -EDESTADDRREQ; 85 daddr = &sk->sk_v6_daddr; 86 } 87 88 if (!oif) 89 oif = sk->sk_bound_dev_if; 90 91 if (!oif) 92 oif = np->sticky_pktinfo.ipi6_ifindex; 93 94 if (!oif && ipv6_addr_is_multicast(daddr)) 95 oif = np->mcast_oif; 96 else if (!oif) 97 oif = np->ucast_oif; 98 99 addr_type = ipv6_addr_type(daddr); 100 if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) || 101 (addr_type & IPV6_ADDR_MAPPED) || 102 (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if)) 103 return -EINVAL; 104 105 ipcm6_init_sk(&ipc6, np); 106 ipc6.sockc.tsflags = sk->sk_tsflags; 107 ipc6.sockc.mark = sk->sk_mark; 108 109 memset(&fl6, 0, sizeof(fl6)); 110 fl6.flowi6_oif = oif; 111 112 if (msg->msg_controllen) { 113 struct ipv6_txoptions opt = {}; 114 115 opt.tot_len = sizeof(opt); 116 ipc6.opt = &opt; 117 118 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6); 119 if (err < 0) 120 return err; 121 122 /* Changes to txoptions and flow info are not implemented, yet. 123 * Drop the options. 124 */ 125 ipc6.opt = NULL; 126 } 127 128 fl6.flowi6_proto = IPPROTO_ICMPV6; 129 fl6.saddr = np->saddr; 130 fl6.daddr = *daddr; 131 fl6.flowi6_mark = ipc6.sockc.mark; 132 fl6.flowi6_uid = sk->sk_uid; 133 fl6.fl6_icmp_type = user_icmph.icmp6_type; 134 fl6.fl6_icmp_code = user_icmph.icmp6_code; 135 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); 136 137 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 138 139 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false); 140 if (IS_ERR(dst)) 141 return PTR_ERR(dst); 142 rt = (struct rt6_info *) dst; 143 144 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 145 fl6.flowi6_oif = np->mcast_oif; 146 else if (!fl6.flowi6_oif) 147 fl6.flowi6_oif = np->ucast_oif; 148 149 pfh.icmph.type = user_icmph.icmp6_type; 150 pfh.icmph.code = user_icmph.icmp6_code; 151 pfh.icmph.checksum = 0; 152 pfh.icmph.un.echo.id = inet->inet_sport; 153 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence; 154 pfh.msg = msg; 155 pfh.wcheck = 0; 156 pfh.family = AF_INET6; 157 158 if (ipc6.hlimit < 0) 159 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 160 161 lock_sock(sk); 162 err = ip6_append_data(sk, ping_getfrag, &pfh, len, 163 0, &ipc6, &fl6, rt, 164 MSG_DONTWAIT); 165 166 if (err) { 167 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev, 168 ICMP6_MIB_OUTERRORS); 169 ip6_flush_pending_frames(sk); 170 } else { 171 icmpv6_push_pending_frames(sk, &fl6, 172 (struct icmp6hdr *)&pfh.icmph, len); 173 } 174 release_sock(sk); 175 176 dst_release(dst); 177 178 if (err) 179 return err; 180 181 return len; 182 } 183 184 struct proto pingv6_prot = { 185 .name = "PINGv6", 186 .owner = THIS_MODULE, 187 .init = ping_init_sock, 188 .close = ping_close, 189 .destroy = ping_v6_destroy, 190 .connect = ip6_datagram_connect_v6_only, 191 .disconnect = __udp_disconnect, 192 .setsockopt = ipv6_setsockopt, 193 .getsockopt = ipv6_getsockopt, 194 .sendmsg = ping_v6_sendmsg, 195 .recvmsg = ping_recvmsg, 196 .bind = ping_bind, 197 .backlog_rcv = ping_queue_rcv_skb, 198 .hash = ping_hash, 199 .unhash = ping_unhash, 200 .get_port = ping_get_port, 201 .put_port = ping_unhash, 202 .obj_size = sizeof(struct raw6_sock), 203 }; 204 EXPORT_SYMBOL_GPL(pingv6_prot); 205 206 static struct inet_protosw pingv6_protosw = { 207 .type = SOCK_DGRAM, 208 .protocol = IPPROTO_ICMPV6, 209 .prot = &pingv6_prot, 210 .ops = &inet6_sockraw_ops, 211 .flags = INET_PROTOSW_REUSE, 212 }; 213 214 #ifdef CONFIG_PROC_FS 215 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos) 216 { 217 return ping_seq_start(seq, pos, AF_INET6); 218 } 219 220 static int ping_v6_seq_show(struct seq_file *seq, void *v) 221 { 222 if (v == SEQ_START_TOKEN) { 223 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 224 } else { 225 int bucket = ((struct ping_iter_state *) seq->private)->bucket; 226 struct inet_sock *inet = inet_sk(v); 227 __u16 srcp = ntohs(inet->inet_sport); 228 __u16 destp = ntohs(inet->inet_dport); 229 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 230 } 231 return 0; 232 } 233 234 static const struct seq_operations ping_v6_seq_ops = { 235 .start = ping_v6_seq_start, 236 .show = ping_v6_seq_show, 237 .next = ping_seq_next, 238 .stop = ping_seq_stop, 239 }; 240 241 static int __net_init ping_v6_proc_init_net(struct net *net) 242 { 243 if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops, 244 sizeof(struct ping_iter_state))) 245 return -ENOMEM; 246 return 0; 247 } 248 249 static void __net_exit ping_v6_proc_exit_net(struct net *net) 250 { 251 remove_proc_entry("icmp6", net->proc_net); 252 } 253 254 static struct pernet_operations ping_v6_net_ops = { 255 .init = ping_v6_proc_init_net, 256 .exit = ping_v6_proc_exit_net, 257 }; 258 #endif 259 260 int __init pingv6_init(void) 261 { 262 #ifdef CONFIG_PROC_FS 263 int ret = register_pernet_subsys(&ping_v6_net_ops); 264 if (ret) 265 return ret; 266 #endif 267 pingv6_ops.ipv6_recv_error = ipv6_recv_error; 268 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl; 269 pingv6_ops.ip6_datagram_recv_specific_ctl = 270 ip6_datagram_recv_specific_ctl; 271 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert; 272 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error; 273 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr; 274 return inet6_register_protosw(&pingv6_protosw); 275 } 276 277 /* This never gets called because it's not possible to unload the ipv6 module, 278 * but just in case. 279 */ 280 void pingv6_exit(void) 281 { 282 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error; 283 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl; 284 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl; 285 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert; 286 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error; 287 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr; 288 #ifdef CONFIG_PROC_FS 289 unregister_pernet_subsys(&ping_v6_net_ops); 290 #endif 291 inet6_unregister_protosw(&pingv6_protosw); 292 } 293