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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
29struct proto pingv6_prot = {
30 .name = "PINGv6",
31 .owner = THIS_MODULE,
32 .init = ping_init_sock,
33 .close = ping_close,
Hannes Frederic Sowa82b276c2014-01-20 05:16:39 +010034 .connect = ip6_datagram_connect_v6_only,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000035 .disconnect = udp_disconnect,
36 .setsockopt = ipv6_setsockopt,
37 .getsockopt = ipv6_getsockopt,
38 .sendmsg = ping_v6_sendmsg,
39 .recvmsg = ping_recvmsg,
40 .bind = ping_bind,
41 .backlog_rcv = ping_queue_rcv_skb,
42 .hash = ping_hash,
43 .unhash = ping_unhash,
44 .get_port = ping_get_port,
45 .obj_size = sizeof(struct raw6_sock),
46};
47EXPORT_SYMBOL_GPL(pingv6_prot);
48
49static struct inet_protosw pingv6_protosw = {
50 .type = SOCK_DGRAM,
51 .protocol = IPPROTO_ICMPV6,
52 .prot = &pingv6_prot,
53 .ops = &inet6_dgram_ops,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000054 .flags = INET_PROTOSW_REUSE,
55};
56
57
58/* Compatibility glue so we can support IPv6 when it's compiled as a module */
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +010059static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
60 int *addr_len)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000061{
62 return -EAFNOSUPPORT;
63}
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +010064static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
Wu Fengguanga06a2d32013-06-12 21:04:16 +080065 struct sk_buff *skb)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000066{
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000067}
Wu Fengguanga06a2d32013-06-12 21:04:16 +080068static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000069{
70 return -EAFNOSUPPORT;
71}
Wu Fengguanga06a2d32013-06-12 21:04:16 +080072static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
73 __be16 port, u32 info, u8 *payload) {}
74static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
75 const struct net_device *dev, int strict)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000076{
77 return 0;
78}
79
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000080int ping_v6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
81 size_t len)
82{
83 struct inet_sock *inet = inet_sk(sk);
84 struct ipv6_pinfo *np = inet6_sk(sk);
85 struct icmp6hdr user_icmph;
86 int addr_type;
87 struct in6_addr *daddr;
88 int iif = 0;
89 struct flowi6 fl6;
90 int err;
91 int hlimit;
92 struct dst_entry *dst;
93 struct rt6_info *rt;
94 struct pingfakehdr pfh;
95
96 pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
97
98 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
99 sizeof(user_icmph));
100 if (err)
101 return err;
102
103 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100104 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000105 if (msg->msg_namelen < sizeof(struct sockaddr_in6) ||
106 u->sin6_family != AF_INET6) {
107 return -EINVAL;
108 }
109 if (sk->sk_bound_dev_if &&
110 sk->sk_bound_dev_if != u->sin6_scope_id) {
111 return -EINVAL;
112 }
113 daddr = &(u->sin6_addr);
114 iif = u->sin6_scope_id;
115 } else {
116 if (sk->sk_state != TCP_ESTABLISHED)
117 return -EDESTADDRREQ;
Eric Dumazetefe42082013-10-03 15:42:29 -0700118 daddr = &sk->sk_v6_daddr;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000119 }
120
121 if (!iif)
122 iif = sk->sk_bound_dev_if;
123
124 addr_type = ipv6_addr_type(daddr);
125 if (__ipv6_addr_needs_scope_id(addr_type) && !iif)
126 return -EINVAL;
127 if (addr_type & IPV6_ADDR_MAPPED)
128 return -EINVAL;
129
130 /* TODO: use ip6_datagram_send_ctl to get options from cmsg */
131
132 memset(&fl6, 0, sizeof(fl6));
133
134 fl6.flowi6_proto = IPPROTO_ICMPV6;
135 fl6.saddr = np->saddr;
136 fl6.daddr = *daddr;
Lorenzo Colittibf439b32014-02-27 13:38:26 +0900137 fl6.flowi6_mark = sk->sk_mark;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000138 fl6.fl6_icmp_type = user_icmph.icmp6_type;
139 fl6.fl6_icmp_code = user_icmph.icmp6_code;
140 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
141
142 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
143 fl6.flowi6_oif = np->mcast_oif;
144 else if (!fl6.flowi6_oif)
145 fl6.flowi6_oif = np->ucast_oif;
146
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200147 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000148 if (IS_ERR(dst))
149 return PTR_ERR(dst);
150 rt = (struct rt6_info *) dst;
151
152 np = inet6_sk(sk);
153 if (!np)
154 return -EBADF;
155
156 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
157 fl6.flowi6_oif = np->mcast_oif;
158 else if (!fl6.flowi6_oif)
159 fl6.flowi6_oif = np->ucast_oif;
160
161 pfh.icmph.type = user_icmph.icmp6_type;
162 pfh.icmph.code = user_icmph.icmp6_code;
163 pfh.icmph.checksum = 0;
164 pfh.icmph.un.echo.id = inet->inet_sport;
165 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
Al Viroc0371da2014-11-24 10:42:55 -0500166 /* XXX: stripping const */
167 pfh.iov = (struct iovec *)msg->msg_iter.iov;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000168 pfh.wcheck = 0;
169 pfh.family = AF_INET6;
170
Lorenzo Colitti5c986312014-04-29 11:57:34 +0900171 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000172
Lorenzo Colittia1bdc452013-07-04 00:52:49 +0900173 lock_sock(sk);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000174 err = ip6_append_data(sk, ping_getfrag, &pfh, len,
175 0, hlimit,
176 np->tclass, NULL, &fl6, rt,
177 MSG_DONTWAIT, np->dontfrag);
178
179 if (err) {
Hannes Frederic Sowa43a43b62014-03-31 20:14:10 +0200180 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
181 ICMP6_MIB_OUTERRORS);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000182 ip6_flush_pending_frames(sk);
183 } else {
184 err = icmpv6_push_pending_frames(sk, &fl6,
185 (struct icmp6hdr *) &pfh.icmph,
186 len);
187 }
Lorenzo Colittia1bdc452013-07-04 00:52:49 +0900188 release_sock(sk);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000189
Lorenzo Colittifbfe80c2013-07-04 00:12:40 +0900190 if (err)
191 return err;
192
193 return len;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000194}
Lorenzo Colittid862e542013-05-31 15:05:50 +0000195
196#ifdef CONFIG_PROC_FS
197static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
198{
199 return ping_seq_start(seq, pos, AF_INET6);
200}
201
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800202static int ping_v6_seq_show(struct seq_file *seq, void *v)
Lorenzo Colittid862e542013-05-31 15:05:50 +0000203{
204 if (v == SEQ_START_TOKEN) {
205 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
206 } else {
207 int bucket = ((struct ping_iter_state *) seq->private)->bucket;
208 struct inet_sock *inet = inet_sk(v);
209 __u16 srcp = ntohs(inet->inet_sport);
210 __u16 destp = ntohs(inet->inet_dport);
211 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
212 }
213 return 0;
214}
215
216static struct ping_seq_afinfo ping_v6_seq_afinfo = {
217 .name = "icmp6",
218 .family = AF_INET6,
219 .seq_fops = &ping_seq_fops,
220 .seq_ops = {
221 .start = ping_v6_seq_start,
222 .show = ping_v6_seq_show,
223 .next = ping_seq_next,
224 .stop = ping_seq_stop,
225 },
226};
227
228static int __net_init ping_v6_proc_init_net(struct net *net)
229{
230 return ping_proc_register(net, &ping_v6_seq_afinfo);
231}
232
233static void __net_init ping_v6_proc_exit_net(struct net *net)
234{
235 return ping_proc_unregister(net, &ping_v6_seq_afinfo);
236}
237
238static struct pernet_operations ping_v6_net_ops = {
239 .init = ping_v6_proc_init_net,
240 .exit = ping_v6_proc_exit_net,
241};
242#endif
243
244int __init pingv6_init(void)
245{
246#ifdef CONFIG_PROC_FS
247 int ret = register_pernet_subsys(&ping_v6_net_ops);
248 if (ret)
249 return ret;
250#endif
251 pingv6_ops.ipv6_recv_error = ipv6_recv_error;
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100252 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
253 pingv6_ops.ip6_datagram_recv_specific_ctl =
254 ip6_datagram_recv_specific_ctl;
Lorenzo Colittid862e542013-05-31 15:05:50 +0000255 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
256 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
257 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
258 return inet6_register_protosw(&pingv6_protosw);
259}
260
261/* This never gets called because it's not possible to unload the ipv6 module,
262 * but just in case.
263 */
264void pingv6_exit(void)
265{
266 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100267 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
268 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
Lorenzo Colittid862e542013-05-31 15:05:50 +0000269 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
270 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
271 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
272#ifdef CONFIG_PROC_FS
273 unregister_pernet_subsys(&ping_v6_net_ops);
274#endif
275 inet6_unregister_protosw(&pingv6_protosw);
276}