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Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +00001/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * "Ping" sockets
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 * Based on ipv4/ping.c code.
14 *
15 * Authors: Lorenzo Colitti (IPv6 support)
16 * Vasiliy Kulikov / Openwall (IPv4 implementation, for Linux 2.6),
17 * Pavel Kankovsky (IPv4 implementation, for Linux 2.4.32)
18 *
19 */
20
21#include <net/addrconf.h>
22#include <net/ipv6.h>
23#include <net/ip6_route.h>
24#include <net/protocol.h>
25#include <net/udp.h>
26#include <net/transp_v6.h>
27#include <net/ping.h>
28
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000029/* Compatibility glue so we can support IPv6 when it's compiled as a module */
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +010030static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
31 int *addr_len)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000032{
33 return -EAFNOSUPPORT;
34}
Hannes Frederic Sowa4b261c752014-01-20 03:43:08 +010035static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
Wu Fengguanga06a2d32013-06-12 21:04:16 +080036 struct sk_buff *skb)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000037{
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000038}
Wu Fengguanga06a2d32013-06-12 21:04:16 +080039static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000040{
41 return -EAFNOSUPPORT;
42}
Wu Fengguanga06a2d32013-06-12 21:04:16 +080043static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
44 __be16 port, u32 info, u8 *payload) {}
45static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
46 const struct net_device *dev, int strict)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000047{
48 return 0;
49}
50
Haishuang Yan6579a022016-03-23 17:59:51 +080051static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000052{
53 struct inet_sock *inet = inet_sk(sk);
54 struct ipv6_pinfo *np = inet6_sk(sk);
55 struct icmp6hdr user_icmph;
56 int addr_type;
57 struct in6_addr *daddr;
Lorenzo Colitti5e457892016-08-13 01:13:38 +090058 int oif = 0;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000059 struct flowi6 fl6;
60 int err;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000061 struct dst_entry *dst;
62 struct rt6_info *rt;
63 struct pingfakehdr pfh;
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -040064 struct sockcm_cookie junk = {0};
Wei Wang26879da2016-05-02 21:40:07 -070065 struct ipcm6_cookie ipc6;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000066
67 pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
68
69 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
70 sizeof(user_icmph));
71 if (err)
72 return err;
73
74 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +010075 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
Lorenzo Colitti91457362015-03-03 23:16:16 +090076 if (msg->msg_namelen < sizeof(*u))
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000077 return -EINVAL;
Lorenzo Colitti91457362015-03-03 23:16:16 +090078 if (u->sin6_family != AF_INET6) {
79 return -EAFNOSUPPORT;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000080 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000081 daddr = &(u->sin6_addr);
Lorenzo Colitti5e457892016-08-13 01:13:38 +090082 if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr)))
83 oif = u->sin6_scope_id;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000084 } else {
85 if (sk->sk_state != TCP_ESTABLISHED)
86 return -EDESTADDRREQ;
Eric Dumazetefe42082013-10-03 15:42:29 -070087 daddr = &sk->sk_v6_daddr;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000088 }
89
Lorenzo Colitti5e457892016-08-13 01:13:38 +090090 if (!oif)
91 oif = sk->sk_bound_dev_if;
92
93 if (!oif)
94 oif = np->sticky_pktinfo.ipi6_ifindex;
95
96 if (!oif && ipv6_addr_is_multicast(daddr))
97 oif = np->mcast_oif;
98 else if (!oif)
99 oif = np->ucast_oif;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000100
101 addr_type = ipv6_addr_type(daddr);
Lorenzo Colitti5e457892016-08-13 01:13:38 +0900102 if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) ||
103 (addr_type & IPV6_ADDR_MAPPED) ||
104 (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if))
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000105 return -EINVAL;
106
107 /* TODO: use ip6_datagram_send_ctl to get options from cmsg */
108
109 memset(&fl6, 0, sizeof(fl6));
110
111 fl6.flowi6_proto = IPPROTO_ICMPV6;
112 fl6.saddr = np->saddr;
113 fl6.daddr = *daddr;
Lorenzo Colitti5e457892016-08-13 01:13:38 +0900114 fl6.flowi6_oif = oif;
Lorenzo Colittibf439b32014-02-27 13:38:26 +0900115 fl6.flowi6_mark = sk->sk_mark;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000116 fl6.fl6_icmp_type = user_icmph.icmp6_type;
117 fl6.fl6_icmp_code = user_icmph.icmp6_code;
118 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
119
Hannes Frederic Sowa38b70972016-06-11 20:08:19 +0200120 ipc6.tclass = np->tclass;
121 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
122
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200123 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000124 if (IS_ERR(dst))
125 return PTR_ERR(dst);
126 rt = (struct rt6_info *) dst;
127
128 np = inet6_sk(sk);
129 if (!np)
130 return -EBADF;
131
132 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
133 fl6.flowi6_oif = np->mcast_oif;
134 else if (!fl6.flowi6_oif)
135 fl6.flowi6_oif = np->ucast_oif;
136
137 pfh.icmph.type = user_icmph.icmp6_type;
138 pfh.icmph.code = user_icmph.icmp6_code;
139 pfh.icmph.checksum = 0;
140 pfh.icmph.un.echo.id = inet->inet_sport;
141 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
Al Virocacdc7d2014-11-27 20:34:16 -0500142 pfh.msg = msg;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000143 pfh.wcheck = 0;
144 pfh.family = AF_INET6;
145
Wei Wang26879da2016-05-02 21:40:07 -0700146 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
Wei Wang26879da2016-05-02 21:40:07 -0700147 ipc6.dontfrag = np->dontfrag;
148 ipc6.opt = NULL;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000149
Lorenzo Colittia1bdc452013-07-04 00:52:49 +0900150 lock_sock(sk);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000151 err = ip6_append_data(sk, ping_getfrag, &pfh, len,
Wei Wang26879da2016-05-02 21:40:07 -0700152 0, &ipc6, &fl6, rt,
153 MSG_DONTWAIT, &junk);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000154
155 if (err) {
Hannes Frederic Sowa43a43b62014-03-31 20:14:10 +0200156 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
157 ICMP6_MIB_OUTERRORS);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000158 ip6_flush_pending_frames(sk);
159 } else {
160 err = icmpv6_push_pending_frames(sk, &fl6,
161 (struct icmp6hdr *) &pfh.icmph,
162 len);
163 }
Lorenzo Colittia1bdc452013-07-04 00:52:49 +0900164 release_sock(sk);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000165
Lorenzo Colittifbfe80c2013-07-04 00:12:40 +0900166 if (err)
167 return err;
168
169 return len;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000170}
Lorenzo Colittid862e542013-05-31 15:05:50 +0000171
Haishuang Yan6579a022016-03-23 17:59:51 +0800172struct proto pingv6_prot = {
173 .name = "PINGv6",
174 .owner = THIS_MODULE,
175 .init = ping_init_sock,
176 .close = ping_close,
177 .connect = ip6_datagram_connect_v6_only,
178 .disconnect = udp_disconnect,
179 .setsockopt = ipv6_setsockopt,
180 .getsockopt = ipv6_getsockopt,
181 .sendmsg = ping_v6_sendmsg,
182 .recvmsg = ping_recvmsg,
183 .bind = ping_bind,
184 .backlog_rcv = ping_queue_rcv_skb,
185 .hash = ping_hash,
186 .unhash = ping_unhash,
187 .get_port = ping_get_port,
188 .obj_size = sizeof(struct raw6_sock),
189};
190EXPORT_SYMBOL_GPL(pingv6_prot);
191
192static struct inet_protosw pingv6_protosw = {
193 .type = SOCK_DGRAM,
194 .protocol = IPPROTO_ICMPV6,
195 .prot = &pingv6_prot,
196 .ops = &inet6_dgram_ops,
197 .flags = INET_PROTOSW_REUSE,
198};
199
Lorenzo Colittid862e542013-05-31 15:05:50 +0000200#ifdef CONFIG_PROC_FS
201static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
202{
203 return ping_seq_start(seq, pos, AF_INET6);
204}
205
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800206static int ping_v6_seq_show(struct seq_file *seq, void *v)
Lorenzo Colittid862e542013-05-31 15:05:50 +0000207{
208 if (v == SEQ_START_TOKEN) {
209 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
210 } else {
211 int bucket = ((struct ping_iter_state *) seq->private)->bucket;
212 struct inet_sock *inet = inet_sk(v);
213 __u16 srcp = ntohs(inet->inet_sport);
214 __u16 destp = ntohs(inet->inet_dport);
215 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
216 }
217 return 0;
218}
219
220static struct ping_seq_afinfo ping_v6_seq_afinfo = {
221 .name = "icmp6",
222 .family = AF_INET6,
223 .seq_fops = &ping_seq_fops,
224 .seq_ops = {
225 .start = ping_v6_seq_start,
226 .show = ping_v6_seq_show,
227 .next = ping_seq_next,
228 .stop = ping_seq_stop,
229 },
230};
231
232static int __net_init ping_v6_proc_init_net(struct net *net)
233{
234 return ping_proc_register(net, &ping_v6_seq_afinfo);
235}
236
237static void __net_init ping_v6_proc_exit_net(struct net *net)
238{
239 return ping_proc_unregister(net, &ping_v6_seq_afinfo);
240}
241
242static struct pernet_operations ping_v6_net_ops = {
243 .init = ping_v6_proc_init_net,
244 .exit = ping_v6_proc_exit_net,
245};
246#endif
247
248int __init pingv6_init(void)
249{
250#ifdef CONFIG_PROC_FS
251 int ret = register_pernet_subsys(&ping_v6_net_ops);
252 if (ret)
253 return ret;
254#endif
255 pingv6_ops.ipv6_recv_error = ipv6_recv_error;
Hannes Frederic Sowa4b261c752014-01-20 03:43:08 +0100256 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
257 pingv6_ops.ip6_datagram_recv_specific_ctl =
258 ip6_datagram_recv_specific_ctl;
Lorenzo Colittid862e542013-05-31 15:05:50 +0000259 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
260 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
261 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
262 return inet6_register_protosw(&pingv6_protosw);
263}
264
265/* This never gets called because it's not possible to unload the ipv6 module,
266 * but just in case.
267 */
268void pingv6_exit(void)
269{
270 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
Hannes Frederic Sowa4b261c752014-01-20 03:43:08 +0100271 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
272 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
Lorenzo Colittid862e542013-05-31 15:05:50 +0000273 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
274 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
275 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
276#ifdef CONFIG_PROC_FS
277 unregister_pernet_subsys(&ping_v6_net_ops);
278#endif
279 inet6_unregister_protosw(&pingv6_protosw);
280}