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TOMOYO Linux Cross Reference
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 struct proto pingv6_prot = {
 30         .name =         "PINGv6",
 31         .owner =        THIS_MODULE,
 32         .init =         ping_init_sock,
 33         .close =        ping_close,
 34         .connect =      ip6_datagram_connect,
 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 };
 47 EXPORT_SYMBOL_GPL(pingv6_prot);
 48 
 49 static 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 */
 60 static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
 61 {
 62         return -EAFNOSUPPORT;
 63 }
 64 static int dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
 65                                        struct sk_buff *skb)
 66 {
 67         return -EAFNOSUPPORT;
 68 }
 69 static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
 70 {
 71         return -EAFNOSUPPORT;
 72 }
 73 static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 74                                   __be16 port, u32 info, u8 *payload) {}
 75 static 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 
 81 int 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                 struct sockaddr_in6 *u = (struct sockaddr_in6 *) 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 = &np->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.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 
147         dst = ip6_sk_dst_lookup_flow(sk, &fl6,  daddr, 1);
148         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;
166         pfh.iov = msg->msg_iov;
167         pfh.wcheck = 0;
168         pfh.family = AF_INET6;
169 
170         if (ipv6_addr_is_multicast(&fl6.daddr))
171                 hlimit = np->mcast_hops;
172         else
173                 hlimit = np->hop_limit;
174         if (hlimit < 0)
175                 hlimit = ip6_dst_hoplimit(dst);
176 
177         lock_sock(sk);
178         err = ip6_append_data(sk, ping_getfrag, &pfh, len,
179                               0, hlimit,
180                               np->tclass, NULL, &fl6, rt,
181                               MSG_DONTWAIT, np->dontfrag);
182 
183         if (err) {
184                 ICMP6_INC_STATS_BH(sock_net(sk), rt->rt6i_idev,
185                                    ICMP6_MIB_OUTERRORS);
186                 ip6_flush_pending_frames(sk);
187         } else {
188                 err = icmpv6_push_pending_frames(sk, &fl6,
189                                                  (struct icmp6hdr *) &pfh.icmph,
190                                                  len);
191         }
192         release_sock(sk);
193 
194         if (err)
195                 return err;
196 
197         return len;
198 }
199 
200 #ifdef CONFIG_PROC_FS
201 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
202 {
203         return ping_seq_start(seq, pos, AF_INET6);
204 }
205 
206 static int ping_v6_seq_show(struct seq_file *seq, void *v)
207 {
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 
220 static 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 
232 static int __net_init ping_v6_proc_init_net(struct net *net)
233 {
234         return ping_proc_register(net, &ping_v6_seq_afinfo);
235 }
236 
237 static void __net_init ping_v6_proc_exit_net(struct net *net)
238 {
239         return ping_proc_unregister(net, &ping_v6_seq_afinfo);
240 }
241 
242 static 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 
248 int __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;
256         pingv6_ops.ip6_datagram_recv_ctl = ip6_datagram_recv_ctl;
257         pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
258         pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
259         pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
260         return inet6_register_protosw(&pingv6_protosw);
261 }
262 
263 /* This never gets called because it's not possible to unload the ipv6 module,
264  * but just in case.
265  */
266 void pingv6_exit(void)
267 {
268         pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
269         pingv6_ops.ip6_datagram_recv_ctl = dummy_ip6_datagram_recv_ctl;
270         pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
271         pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
272         pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
273 #ifdef CONFIG_PROC_FS
274         unregister_pernet_subsys(&ping_v6_net_ops);
275 #endif
276         inet6_unregister_protosw(&pingv6_protosw);
277 }
278 

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