Loading...
1/*
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,
34 .connect = ip6_datagram_connect_v6_only,
35 .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,
54 .no_check = UDP_CSUM_DEFAULT,
55 .flags = INET_PROTOSW_REUSE,
56};
57
58
59/* Compatibility glue so we can support IPv6 when it's compiled as a module */
60static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
61 int *addr_len)
62{
63 return -EAFNOSUPPORT;
64}
65static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
66 struct sk_buff *skb)
67{
68}
69static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
70{
71 return -EAFNOSUPPORT;
72}
73static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
74 __be16 port, u32 info, u8 *payload) {}
75static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
76 const struct net_device *dev, int strict)
77{
78 return 0;
79}
80
81int ping_v6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
82 size_t len)
83{
84 struct inet_sock *inet = inet_sk(sk);
85 struct ipv6_pinfo *np = inet6_sk(sk);
86 struct icmp6hdr user_icmph;
87 int addr_type;
88 struct in6_addr *daddr;
89 int iif = 0;
90 struct flowi6 fl6;
91 int err;
92 int hlimit;
93 struct dst_entry *dst;
94 struct rt6_info *rt;
95 struct pingfakehdr pfh;
96
97 pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
98
99 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
100 sizeof(user_icmph));
101 if (err)
102 return err;
103
104 if (msg->msg_name) {
105 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
106 if (msg->msg_namelen < sizeof(struct sockaddr_in6) ||
107 u->sin6_family != AF_INET6) {
108 return -EINVAL;
109 }
110 if (sk->sk_bound_dev_if &&
111 sk->sk_bound_dev_if != u->sin6_scope_id) {
112 return -EINVAL;
113 }
114 daddr = &(u->sin6_addr);
115 iif = u->sin6_scope_id;
116 } else {
117 if (sk->sk_state != TCP_ESTABLISHED)
118 return -EDESTADDRREQ;
119 daddr = &sk->sk_v6_daddr;
120 }
121
122 if (!iif)
123 iif = sk->sk_bound_dev_if;
124
125 addr_type = ipv6_addr_type(daddr);
126 if (__ipv6_addr_needs_scope_id(addr_type) && !iif)
127 return -EINVAL;
128 if (addr_type & IPV6_ADDR_MAPPED)
129 return -EINVAL;
130
131 /* TODO: use ip6_datagram_send_ctl to get options from cmsg */
132
133 memset(&fl6, 0, sizeof(fl6));
134
135 fl6.flowi6_proto = IPPROTO_ICMPV6;
136 fl6.saddr = np->saddr;
137 fl6.daddr = *daddr;
138 fl6.flowi6_mark = sk->sk_mark;
139 fl6.fl6_icmp_type = user_icmph.icmp6_type;
140 fl6.fl6_icmp_code = user_icmph.icmp6_code;
141 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
142
143 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
144 fl6.flowi6_oif = np->mcast_oif;
145 else if (!fl6.flowi6_oif)
146 fl6.flowi6_oif = np->ucast_oif;
147
148 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr);
149 if (IS_ERR(dst))
150 return PTR_ERR(dst);
151 rt = (struct rt6_info *) dst;
152
153 np = inet6_sk(sk);
154 if (!np)
155 return -EBADF;
156
157 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
158 fl6.flowi6_oif = np->mcast_oif;
159 else if (!fl6.flowi6_oif)
160 fl6.flowi6_oif = np->ucast_oif;
161
162 pfh.icmph.type = user_icmph.icmp6_type;
163 pfh.icmph.code = user_icmph.icmp6_code;
164 pfh.icmph.checksum = 0;
165 pfh.icmph.un.echo.id = inet->inet_sport;
166 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
167 pfh.iov = msg->msg_iov;
168 pfh.wcheck = 0;
169 pfh.family = AF_INET6;
170
171 if (ipv6_addr_is_multicast(&fl6.daddr))
172 hlimit = np->mcast_hops;
173 else
174 hlimit = np->hop_limit;
175 if (hlimit < 0)
176 hlimit = ip6_dst_hoplimit(dst);
177
178 lock_sock(sk);
179 err = ip6_append_data(sk, ping_getfrag, &pfh, len,
180 0, hlimit,
181 np->tclass, NULL, &fl6, rt,
182 MSG_DONTWAIT, np->dontfrag);
183
184 if (err) {
185 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
186 ICMP6_MIB_OUTERRORS);
187 ip6_flush_pending_frames(sk);
188 } else {
189 err = icmpv6_push_pending_frames(sk, &fl6,
190 (struct icmp6hdr *) &pfh.icmph,
191 len);
192 }
193 release_sock(sk);
194
195 if (err)
196 return err;
197
198 return len;
199}
200
201#ifdef CONFIG_PROC_FS
202static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
203{
204 return ping_seq_start(seq, pos, AF_INET6);
205}
206
207static int ping_v6_seq_show(struct seq_file *seq, void *v)
208{
209 if (v == SEQ_START_TOKEN) {
210 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
211 } else {
212 int bucket = ((struct ping_iter_state *) seq->private)->bucket;
213 struct inet_sock *inet = inet_sk(v);
214 __u16 srcp = ntohs(inet->inet_sport);
215 __u16 destp = ntohs(inet->inet_dport);
216 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
217 }
218 return 0;
219}
220
221static struct ping_seq_afinfo ping_v6_seq_afinfo = {
222 .name = "icmp6",
223 .family = AF_INET6,
224 .seq_fops = &ping_seq_fops,
225 .seq_ops = {
226 .start = ping_v6_seq_start,
227 .show = ping_v6_seq_show,
228 .next = ping_seq_next,
229 .stop = ping_seq_stop,
230 },
231};
232
233static int __net_init ping_v6_proc_init_net(struct net *net)
234{
235 return ping_proc_register(net, &ping_v6_seq_afinfo);
236}
237
238static void __net_init ping_v6_proc_exit_net(struct net *net)
239{
240 return ping_proc_unregister(net, &ping_v6_seq_afinfo);
241}
242
243static struct pernet_operations ping_v6_net_ops = {
244 .init = ping_v6_proc_init_net,
245 .exit = ping_v6_proc_exit_net,
246};
247#endif
248
249int __init pingv6_init(void)
250{
251#ifdef CONFIG_PROC_FS
252 int ret = register_pernet_subsys(&ping_v6_net_ops);
253 if (ret)
254 return ret;
255#endif
256 pingv6_ops.ipv6_recv_error = ipv6_recv_error;
257 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
258 pingv6_ops.ip6_datagram_recv_specific_ctl =
259 ip6_datagram_recv_specific_ctl;
260 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
261 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
262 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
263 return inet6_register_protosw(&pingv6_protosw);
264}
265
266/* This never gets called because it's not possible to unload the ipv6 module,
267 * but just in case.
268 */
269void pingv6_exit(void)
270{
271 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
272 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
273 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
274 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
275 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
276 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
277#ifdef CONFIG_PROC_FS
278 unregister_pernet_subsys(&ping_v6_net_ops);
279#endif
280 inet6_unregister_protosw(&pingv6_protosw);
281}
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 */
26static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
27 int *addr_len)
28{
29 return -EAFNOSUPPORT;
30}
31static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
32 struct sk_buff *skb)
33{
34}
35static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
36{
37 return -EAFNOSUPPORT;
38}
39static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
40 __be16 port, u32 info, u8 *payload) {}
41static 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
47static 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 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
118
119 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false);
120 if (IS_ERR(dst))
121 return PTR_ERR(dst);
122 rt = (struct rt6_info *) dst;
123
124 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
125 fl6.flowi6_oif = np->mcast_oif;
126 else if (!fl6.flowi6_oif)
127 fl6.flowi6_oif = np->ucast_oif;
128
129 pfh.icmph.type = user_icmph.icmp6_type;
130 pfh.icmph.code = user_icmph.icmp6_code;
131 pfh.icmph.checksum = 0;
132 pfh.icmph.un.echo.id = inet->inet_sport;
133 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
134 pfh.msg = msg;
135 pfh.wcheck = 0;
136 pfh.family = AF_INET6;
137
138 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
139
140 lock_sock(sk);
141 err = ip6_append_data(sk, ping_getfrag, &pfh, len,
142 0, &ipc6, &fl6, rt,
143 MSG_DONTWAIT);
144
145 if (err) {
146 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
147 ICMP6_MIB_OUTERRORS);
148 ip6_flush_pending_frames(sk);
149 } else {
150 icmpv6_push_pending_frames(sk, &fl6,
151 (struct icmp6hdr *)&pfh.icmph, len);
152 }
153 release_sock(sk);
154
155 dst_release(dst);
156
157 if (err)
158 return err;
159
160 return len;
161}
162
163struct proto pingv6_prot = {
164 .name = "PINGv6",
165 .owner = THIS_MODULE,
166 .init = ping_init_sock,
167 .close = ping_close,
168 .connect = ip6_datagram_connect_v6_only,
169 .disconnect = __udp_disconnect,
170 .setsockopt = ipv6_setsockopt,
171 .getsockopt = ipv6_getsockopt,
172 .sendmsg = ping_v6_sendmsg,
173 .recvmsg = ping_recvmsg,
174 .bind = ping_bind,
175 .backlog_rcv = ping_queue_rcv_skb,
176 .hash = ping_hash,
177 .unhash = ping_unhash,
178 .get_port = ping_get_port,
179 .obj_size = sizeof(struct raw6_sock),
180};
181EXPORT_SYMBOL_GPL(pingv6_prot);
182
183static struct inet_protosw pingv6_protosw = {
184 .type = SOCK_DGRAM,
185 .protocol = IPPROTO_ICMPV6,
186 .prot = &pingv6_prot,
187 .ops = &inet6_sockraw_ops,
188 .flags = INET_PROTOSW_REUSE,
189};
190
191#ifdef CONFIG_PROC_FS
192static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
193{
194 return ping_seq_start(seq, pos, AF_INET6);
195}
196
197static int ping_v6_seq_show(struct seq_file *seq, void *v)
198{
199 if (v == SEQ_START_TOKEN) {
200 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
201 } else {
202 int bucket = ((struct ping_iter_state *) seq->private)->bucket;
203 struct inet_sock *inet = inet_sk(v);
204 __u16 srcp = ntohs(inet->inet_sport);
205 __u16 destp = ntohs(inet->inet_dport);
206 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
207 }
208 return 0;
209}
210
211static const struct seq_operations ping_v6_seq_ops = {
212 .start = ping_v6_seq_start,
213 .show = ping_v6_seq_show,
214 .next = ping_seq_next,
215 .stop = ping_seq_stop,
216};
217
218static int __net_init ping_v6_proc_init_net(struct net *net)
219{
220 if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops,
221 sizeof(struct ping_iter_state)))
222 return -ENOMEM;
223 return 0;
224}
225
226static void __net_exit ping_v6_proc_exit_net(struct net *net)
227{
228 remove_proc_entry("icmp6", net->proc_net);
229}
230
231static struct pernet_operations ping_v6_net_ops = {
232 .init = ping_v6_proc_init_net,
233 .exit = ping_v6_proc_exit_net,
234};
235#endif
236
237int __init pingv6_init(void)
238{
239#ifdef CONFIG_PROC_FS
240 int ret = register_pernet_subsys(&ping_v6_net_ops);
241 if (ret)
242 return ret;
243#endif
244 pingv6_ops.ipv6_recv_error = ipv6_recv_error;
245 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
246 pingv6_ops.ip6_datagram_recv_specific_ctl =
247 ip6_datagram_recv_specific_ctl;
248 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
249 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
250 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
251 return inet6_register_protosw(&pingv6_protosw);
252}
253
254/* This never gets called because it's not possible to unload the ipv6 module,
255 * but just in case.
256 */
257void pingv6_exit(void)
258{
259 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
260 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
261 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
262 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
263 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
264 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
265#ifdef CONFIG_PROC_FS
266 unregister_pernet_subsys(&ping_v6_net_ops);
267#endif
268 inet6_unregister_protosw(&pingv6_protosw);
269}