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Linux/net/ipv6/ping.c

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  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 
 29 /* Compatibility glue so we can support IPv6 when it's compiled as a module */
 30 static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
 31                                  int *addr_len)
 32 {
 33         return -EAFNOSUPPORT;
 34 }
 35 static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
 36                                        struct sk_buff *skb)
 37 {
 38 }
 39 static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
 40 {
 41         return -EAFNOSUPPORT;
 42 }
 43 static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 44                                   __be16 port, u32 info, u8 *payload) {}
 45 static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
 46                                const struct net_device *dev, int strict)
 47 {
 48         return 0;
 49 }
 50 
 51 static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 52 {
 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;
 58         int iif = 0;
 59         struct flowi6 fl6;
 60         int err;
 61         int hlimit;
 62         struct dst_entry *dst;
 63         struct rt6_info *rt;
 64         struct pingfakehdr pfh;
 65 
 66         pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
 67 
 68         err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
 69                                   sizeof(user_icmph));
 70         if (err)
 71                 return err;
 72 
 73         if (msg->msg_name) {
 74                 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
 75                 if (msg->msg_namelen < sizeof(*u))
 76                         return -EINVAL;
 77                 if (u->sin6_family != AF_INET6) {
 78                         return -EAFNOSUPPORT;
 79                 }
 80                 if (sk->sk_bound_dev_if &&
 81                     sk->sk_bound_dev_if != u->sin6_scope_id) {
 82                         return -EINVAL;
 83                 }
 84                 daddr = &(u->sin6_addr);
 85                 iif = u->sin6_scope_id;
 86         } else {
 87                 if (sk->sk_state != TCP_ESTABLISHED)
 88                         return -EDESTADDRREQ;
 89                 daddr = &sk->sk_v6_daddr;
 90         }
 91 
 92         if (!iif)
 93                 iif = sk->sk_bound_dev_if;
 94 
 95         addr_type = ipv6_addr_type(daddr);
 96         if (__ipv6_addr_needs_scope_id(addr_type) && !iif)
 97                 return -EINVAL;
 98         if (addr_type & IPV6_ADDR_MAPPED)
 99                 return -EINVAL;
100 
101         /* TODO: use ip6_datagram_send_ctl to get options from cmsg */
102 
103         memset(&fl6, 0, sizeof(fl6));
104 
105         fl6.flowi6_proto = IPPROTO_ICMPV6;
106         fl6.saddr = np->saddr;
107         fl6.daddr = *daddr;
108         fl6.flowi6_mark = sk->sk_mark;
109         fl6.fl6_icmp_type = user_icmph.icmp6_type;
110         fl6.fl6_icmp_code = user_icmph.icmp6_code;
111         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
112 
113         if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
114                 fl6.flowi6_oif = np->mcast_oif;
115         else if (!fl6.flowi6_oif)
116                 fl6.flowi6_oif = np->ucast_oif;
117 
118         dst = ip6_sk_dst_lookup_flow(sk, &fl6,  daddr);
119         if (IS_ERR(dst))
120                 return PTR_ERR(dst);
121         rt = (struct rt6_info *) dst;
122 
123         np = inet6_sk(sk);
124         if (!np)
125                 return -EBADF;
126 
127         if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
128                 fl6.flowi6_oif = np->mcast_oif;
129         else if (!fl6.flowi6_oif)
130                 fl6.flowi6_oif = np->ucast_oif;
131 
132         pfh.icmph.type = user_icmph.icmp6_type;
133         pfh.icmph.code = user_icmph.icmp6_code;
134         pfh.icmph.checksum = 0;
135         pfh.icmph.un.echo.id = inet->inet_sport;
136         pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
137         pfh.msg = msg;
138         pfh.wcheck = 0;
139         pfh.family = AF_INET6;
140 
141         hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
142 
143         lock_sock(sk);
144         err = ip6_append_data(sk, ping_getfrag, &pfh, len,
145                               0, hlimit,
146                               np->tclass, NULL, &fl6, rt,
147                               MSG_DONTWAIT, np->dontfrag);
148 
149         if (err) {
150                 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
151                                 ICMP6_MIB_OUTERRORS);
152                 ip6_flush_pending_frames(sk);
153         } else {
154                 err = icmpv6_push_pending_frames(sk, &fl6,
155                                                  (struct icmp6hdr *) &pfh.icmph,
156                                                  len);
157         }
158         release_sock(sk);
159 
160         if (err)
161                 return err;
162 
163         return len;
164 }
165 
166 struct proto pingv6_prot = {
167         .name =         "PINGv6",
168         .owner =        THIS_MODULE,
169         .init =         ping_init_sock,
170         .close =        ping_close,
171         .connect =      ip6_datagram_connect_v6_only,
172         .disconnect =   udp_disconnect,
173         .setsockopt =   ipv6_setsockopt,
174         .getsockopt =   ipv6_getsockopt,
175         .sendmsg =      ping_v6_sendmsg,
176         .recvmsg =      ping_recvmsg,
177         .bind =         ping_bind,
178         .backlog_rcv =  ping_queue_rcv_skb,
179         .hash =         ping_hash,
180         .unhash =       ping_unhash,
181         .get_port =     ping_get_port,
182         .obj_size =     sizeof(struct raw6_sock),
183 };
184 EXPORT_SYMBOL_GPL(pingv6_prot);
185 
186 static struct inet_protosw pingv6_protosw = {
187         .type =      SOCK_DGRAM,
188         .protocol =  IPPROTO_ICMPV6,
189         .prot =      &pingv6_prot,
190         .ops =       &inet6_dgram_ops,
191         .flags =     INET_PROTOSW_REUSE,
192 };
193 
194 #ifdef CONFIG_PROC_FS
195 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
196 {
197         return ping_seq_start(seq, pos, AF_INET6);
198 }
199 
200 static int ping_v6_seq_show(struct seq_file *seq, void *v)
201 {
202         if (v == SEQ_START_TOKEN) {
203                 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
204         } else {
205                 int bucket = ((struct ping_iter_state *) seq->private)->bucket;
206                 struct inet_sock *inet = inet_sk(v);
207                 __u16 srcp = ntohs(inet->inet_sport);
208                 __u16 destp = ntohs(inet->inet_dport);
209                 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
210         }
211         return 0;
212 }
213 
214 static struct ping_seq_afinfo ping_v6_seq_afinfo = {
215         .name           = "icmp6",
216         .family         = AF_INET6,
217         .seq_fops       = &ping_seq_fops,
218         .seq_ops        = {
219                 .start          = ping_v6_seq_start,
220                 .show           = ping_v6_seq_show,
221                 .next           = ping_seq_next,
222                 .stop           = ping_seq_stop,
223         },
224 };
225 
226 static int __net_init ping_v6_proc_init_net(struct net *net)
227 {
228         return ping_proc_register(net, &ping_v6_seq_afinfo);
229 }
230 
231 static void __net_init ping_v6_proc_exit_net(struct net *net)
232 {
233         return ping_proc_unregister(net, &ping_v6_seq_afinfo);
234 }
235 
236 static struct pernet_operations ping_v6_net_ops = {
237         .init = ping_v6_proc_init_net,
238         .exit = ping_v6_proc_exit_net,
239 };
240 #endif
241 
242 int __init pingv6_init(void)
243 {
244 #ifdef CONFIG_PROC_FS
245         int ret = register_pernet_subsys(&ping_v6_net_ops);
246         if (ret)
247                 return ret;
248 #endif
249         pingv6_ops.ipv6_recv_error = ipv6_recv_error;
250         pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
251         pingv6_ops.ip6_datagram_recv_specific_ctl =
252                 ip6_datagram_recv_specific_ctl;
253         pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
254         pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
255         pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
256         return inet6_register_protosw(&pingv6_protosw);
257 }
258 
259 /* This never gets called because it's not possible to unload the ipv6 module,
260  * but just in case.
261  */
262 void pingv6_exit(void)
263 {
264         pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
265         pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
266         pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
267         pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
268         pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
269         pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
270 #ifdef CONFIG_PROC_FS
271         unregister_pernet_subsys(&ping_v6_net_ops);
272 #endif
273         inet6_unregister_protosw(&pingv6_protosw);
274 }
275 

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