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 pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); 63 64 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph, 65 sizeof(user_icmph)); 66 if (err) 67 return err; 68 69 if (msg->msg_name) { 70 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name); 71 if (msg->msg_namelen < sizeof(*u)) 72 return -EINVAL; 73 if (u->sin6_family != AF_INET6) { 74 return -EAFNOSUPPORT; 75 } 76 daddr = &(u->sin6_addr); 77 if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr))) 78 oif = u->sin6_scope_id; 79 } else { 80 if (sk->sk_state != TCP_ESTABLISHED) 81 return -EDESTADDRREQ; 82 daddr = &sk->sk_v6_daddr; 83 } 84 85 if (!oif) 86 oif = sk->sk_bound_dev_if; 87 88 if (!oif) 89 oif = np->sticky_pktinfo.ipi6_ifindex; 90 91 if (!oif && ipv6_addr_is_multicast(daddr)) 92 oif = np->mcast_oif; 93 else if (!oif) 94 oif = np->ucast_oif; 95 96 addr_type = ipv6_addr_type(daddr); 97 if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) || 98 (addr_type & IPV6_ADDR_MAPPED) || 99 (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if)) 100 return -EINVAL; 101 102 /* TODO: use ip6_datagram_send_ctl to get options from cmsg */ 103 104 memset(&fl6, 0, sizeof(fl6)); 105 106 fl6.flowi6_proto = IPPROTO_ICMPV6; 107 fl6.saddr = np->saddr; 108 fl6.daddr = *daddr; 109 fl6.flowi6_oif = oif; 110 fl6.flowi6_mark = sk->sk_mark; 111 fl6.flowi6_uid = sk->sk_uid; 112 fl6.fl6_icmp_type = user_icmph.icmp6_type; 113 fl6.fl6_icmp_code = user_icmph.icmp6_code; 114 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 115 116 ipcm6_init_sk(&ipc6, np); 117 ipc6.sockc.mark = sk->sk_mark; 118 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 119 120 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false); 121 if (IS_ERR(dst)) 122 return PTR_ERR(dst); 123 rt = (struct rt6_info *) dst; 124 125 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 126 fl6.flowi6_oif = np->mcast_oif; 127 else if (!fl6.flowi6_oif) 128 fl6.flowi6_oif = np->ucast_oif; 129 130 pfh.icmph.type = user_icmph.icmp6_type; 131 pfh.icmph.code = user_icmph.icmp6_code; 132 pfh.icmph.checksum = 0; 133 pfh.icmph.un.echo.id = inet->inet_sport; 134 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence; 135 pfh.msg = msg; 136 pfh.wcheck = 0; 137 pfh.family = AF_INET6; 138 139 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 140 141 lock_sock(sk); 142 err = ip6_append_data(sk, ping_getfrag, &pfh, len, 143 0, &ipc6, &fl6, rt, 144 MSG_DONTWAIT); 145 146 if (err) { 147 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev, 148 ICMP6_MIB_OUTERRORS); 149 ip6_flush_pending_frames(sk); 150 } else { 151 icmpv6_push_pending_frames(sk, &fl6, 152 (struct icmp6hdr *)&pfh.icmph, len); 153 } 154 release_sock(sk); 155 156 dst_release(dst); 157 158 if (err) 159 return err; 160 161 return len; 162 } 163 164 struct proto pingv6_prot = { 165 .name = "PINGv6", 166 .owner = THIS_MODULE, 167 .init = ping_init_sock, 168 .close = ping_close, 169 .connect = ip6_datagram_connect_v6_only, 170 .disconnect = __udp_disconnect, 171 .setsockopt = ipv6_setsockopt, 172 .getsockopt = ipv6_getsockopt, 173 .sendmsg = ping_v6_sendmsg, 174 .recvmsg = ping_recvmsg, 175 .bind = ping_bind, 176 .backlog_rcv = ping_queue_rcv_skb, 177 .hash = ping_hash, 178 .unhash = ping_unhash, 179 .get_port = ping_get_port, 180 .obj_size = sizeof(struct raw6_sock), 181 }; 182 EXPORT_SYMBOL_GPL(pingv6_prot); 183 184 static struct inet_protosw pingv6_protosw = { 185 .type = SOCK_DGRAM, 186 .protocol = IPPROTO_ICMPV6, 187 .prot = &pingv6_prot, 188 .ops = &inet6_sockraw_ops, 189 .flags = INET_PROTOSW_REUSE, 190 }; 191 192 #ifdef CONFIG_PROC_FS 193 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos) 194 { 195 return ping_seq_start(seq, pos, AF_INET6); 196 } 197 198 static int ping_v6_seq_show(struct seq_file *seq, void *v) 199 { 200 if (v == SEQ_START_TOKEN) { 201 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 202 } else { 203 int bucket = ((struct ping_iter_state *) seq->private)->bucket; 204 struct inet_sock *inet = inet_sk(v); 205 __u16 srcp = ntohs(inet->inet_sport); 206 __u16 destp = ntohs(inet->inet_dport); 207 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 208 } 209 return 0; 210 } 211 212 static const struct seq_operations ping_v6_seq_ops = { 213 .start = ping_v6_seq_start, 214 .show = ping_v6_seq_show, 215 .next = ping_seq_next, 216 .stop = ping_seq_stop, 217 }; 218 219 static int __net_init ping_v6_proc_init_net(struct net *net) 220 { 221 if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops, 222 sizeof(struct ping_iter_state))) 223 return -ENOMEM; 224 return 0; 225 } 226 227 static void __net_exit ping_v6_proc_exit_net(struct net *net) 228 { 229 remove_proc_entry("icmp6", net->proc_net); 230 } 231 232 static struct pernet_operations ping_v6_net_ops = { 233 .init = ping_v6_proc_init_net, 234 .exit = ping_v6_proc_exit_net, 235 }; 236 #endif 237 238 int __init pingv6_init(void) 239 { 240 #ifdef CONFIG_PROC_FS 241 int ret = register_pernet_subsys(&ping_v6_net_ops); 242 if (ret) 243 return ret; 244 #endif 245 pingv6_ops.ipv6_recv_error = ipv6_recv_error; 246 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl; 247 pingv6_ops.ip6_datagram_recv_specific_ctl = 248 ip6_datagram_recv_specific_ctl; 249 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert; 250 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error; 251 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr; 252 return inet6_register_protosw(&pingv6_protosw); 253 } 254 255 /* This never gets called because it's not possible to unload the ipv6 module, 256 * but just in case. 257 */ 258 void pingv6_exit(void) 259 { 260 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error; 261 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl; 262 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl; 263 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert; 264 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error; 265 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr; 266 #ifdef CONFIG_PROC_FS 267 unregister_pernet_subsys(&ping_v6_net_ops); 268 #endif 269 inet6_unregister_protosw(&pingv6_protosw); 270 } 271