1 // SPDX-License-Identifier: GPL-2.0-or-later
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.
9 * Based on ipv4/ping.c code.
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)
16 #include <net/addrconf.h>
18 #include <net/ip6_route.h>
19 #include <net/protocol.h>
21 #include <net/transp_v6.h>
22 #include <linux/proc_fs.h>
25 static void ping_v6_destroy(struct sock *sk)
27 inet6_destroy_sock(sk);
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,
36 static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
40 static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
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)
52 static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
54 struct inet_sock *inet = inet_sk(sk);
55 struct ipv6_pinfo *np = inet6_sk(sk);
56 struct icmp6hdr user_icmph;
58 struct in6_addr *daddr;
62 struct dst_entry *dst;
64 struct pingfakehdr pfh;
65 struct ipcm6_cookie ipc6;
67 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
72 memset(&fl6, 0, sizeof(fl6));
75 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
76 if (msg->msg_namelen < sizeof(*u))
78 if (u->sin6_family != AF_INET6) {
81 daddr = &(u->sin6_addr);
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;
87 if (sk->sk_state != TCP_ESTABLISHED)
89 daddr = &sk->sk_v6_daddr;
90 fl6.flowlabel = np->flow_label;
94 oif = sk->sk_bound_dev_if;
97 oif = np->sticky_pktinfo.ipi6_ifindex;
99 if (!oif && ipv6_addr_is_multicast(daddr))
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))
110 ipcm6_init_sk(&ipc6, np);
111 ipc6.sockc.tsflags = sk->sk_tsflags;
112 ipc6.sockc.mark = sk->sk_mark;
114 fl6.flowi6_oif = oif;
116 if (msg->msg_controllen) {
117 struct ipv6_txoptions opt = {};
119 opt.tot_len = sizeof(opt);
122 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
126 /* Changes to txoptions and flow info are not implemented, yet.
132 fl6.flowi6_proto = IPPROTO_ICMPV6;
133 fl6.saddr = np->saddr;
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));
141 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
143 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false);
146 rt = (struct rt6_info *) dst;
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;
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;
160 pfh.family = AF_INET6;
163 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
166 err = ip6_append_data(sk, ping_getfrag, &pfh, len,
171 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
172 ICMP6_MIB_OUTERRORS);
173 ip6_flush_pending_frames(sk);
175 icmpv6_push_pending_frames(sk, &fl6,
176 (struct icmp6hdr *)&pfh.icmph, len);
188 struct proto pingv6_prot = {
190 .owner = THIS_MODULE,
191 .init = ping_init_sock,
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,
201 .backlog_rcv = ping_queue_rcv_skb,
203 .unhash = ping_unhash,
204 .get_port = ping_get_port,
205 .put_port = ping_unhash,
206 .obj_size = sizeof(struct raw6_sock),
208 EXPORT_SYMBOL_GPL(pingv6_prot);
210 static struct inet_protosw pingv6_protosw = {
212 .protocol = IPPROTO_ICMPV6,
213 .prot = &pingv6_prot,
214 .ops = &inet6_sockraw_ops,
215 .flags = INET_PROTOSW_REUSE,
218 #ifdef CONFIG_PROC_FS
219 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
221 return ping_seq_start(seq, pos, AF_INET6);
224 static int ping_v6_seq_show(struct seq_file *seq, void *v)
226 if (v == SEQ_START_TOKEN) {
227 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
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);
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,
245 static int __net_init ping_v6_proc_init_net(struct net *net)
247 if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops,
248 sizeof(struct ping_iter_state)))
253 static void __net_exit ping_v6_proc_exit_net(struct net *net)
255 remove_proc_entry("icmp6", net->proc_net);
258 static struct pernet_operations ping_v6_net_ops = {
259 .init = ping_v6_proc_init_net,
260 .exit = ping_v6_proc_exit_net,
264 int __init pingv6_init(void)
266 #ifdef CONFIG_PROC_FS
267 int ret = register_pernet_subsys(&ping_v6_net_ops);
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);
281 /* This never gets called because it's not possible to unload the ipv6 module,
284 void pingv6_exit(void)
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);
295 inet6_unregister_protosw(&pingv6_protosw);