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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_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 };
 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         .flags =     INET_PROTOSW_REUSE,
 55 };
 56 
 57 
 58 /* Compatibility glue so we can support IPv6 when it's compiled as a module */
 59 static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
 60                                  int *addr_len)
 61 {
 62         return -EAFNOSUPPORT;
 63 }
 64 static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
 65                                        struct sk_buff *skb)
 66 {
 67 }
 68 static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
 69 {
 70         return -EAFNOSUPPORT;
 71 }
 72 static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 73                                   __be16 port, u32 info, u8 *payload) {}
 74 static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
 75                                const struct net_device *dev, int strict)
 76 {
 77         return 0;
 78 }
 79 
 80 int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 81 {
 82         struct inet_sock *inet = inet_sk(sk);
 83         struct ipv6_pinfo *np = inet6_sk(sk);
 84         struct icmp6hdr user_icmph;
 85         int addr_type;
 86         struct in6_addr *daddr;
 87         int iif = 0;
 88         struct flowi6 fl6;
 89         int err;
 90         int hlimit;
 91         struct dst_entry *dst;
 92         struct rt6_info *rt;
 93         struct pingfakehdr pfh;
 94 
 95         pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
 96 
 97         err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
 98                                   sizeof(user_icmph));
 99         if (err)
100                 return err;
101 
102         if (msg->msg_name) {
103                 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
104                 if (msg->msg_namelen < sizeof(*u))
105                         return -EINVAL;
106                 if (u->sin6_family != AF_INET6) {
107                         return -EAFNOSUPPORT;
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;
118                 daddr = &sk->sk_v6_daddr;
119         }
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;
137         fl6.flowi6_mark = sk->sk_mark;
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);
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.msg = msg;
167         pfh.wcheck = 0;
168         pfh.family = AF_INET6;
169 
170         hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
171 
172         lock_sock(sk);
173         err = ip6_append_data(sk, ping_getfrag, &pfh, len,
174                               0, hlimit,
175                               np->tclass, NULL, &fl6, rt,
176                               MSG_DONTWAIT, np->dontfrag);
177 
178         if (err) {
179                 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
180                                 ICMP6_MIB_OUTERRORS);
181                 ip6_flush_pending_frames(sk);
182         } else {
183                 err = icmpv6_push_pending_frames(sk, &fl6,
184                                                  (struct icmp6hdr *) &pfh.icmph,
185                                                  len);
186         }
187         release_sock(sk);
188 
189         if (err)
190                 return err;
191 
192         return len;
193 }
194 
195 #ifdef CONFIG_PROC_FS
196 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
197 {
198         return ping_seq_start(seq, pos, AF_INET6);
199 }
200 
201 static int ping_v6_seq_show(struct seq_file *seq, void *v)
202 {
203         if (v == SEQ_START_TOKEN) {
204                 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
205         } else {
206                 int bucket = ((struct ping_iter_state *) seq->private)->bucket;
207                 struct inet_sock *inet = inet_sk(v);
208                 __u16 srcp = ntohs(inet->inet_sport);
209                 __u16 destp = ntohs(inet->inet_dport);
210                 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
211         }
212         return 0;
213 }
214 
215 static struct ping_seq_afinfo ping_v6_seq_afinfo = {
216         .name           = "icmp6",
217         .family         = AF_INET6,
218         .seq_fops       = &ping_seq_fops,
219         .seq_ops        = {
220                 .start          = ping_v6_seq_start,
221                 .show           = ping_v6_seq_show,
222                 .next           = ping_seq_next,
223                 .stop           = ping_seq_stop,
224         },
225 };
226 
227 static int __net_init ping_v6_proc_init_net(struct net *net)
228 {
229         return ping_proc_register(net, &ping_v6_seq_afinfo);
230 }
231 
232 static void __net_init ping_v6_proc_exit_net(struct net *net)
233 {
234         return ping_proc_unregister(net, &ping_v6_seq_afinfo);
235 }
236 
237 static struct pernet_operations ping_v6_net_ops = {
238         .init = ping_v6_proc_init_net,
239         .exit = ping_v6_proc_exit_net,
240 };
241 #endif
242 
243 int __init pingv6_init(void)
244 {
245 #ifdef CONFIG_PROC_FS
246         int ret = register_pernet_subsys(&ping_v6_net_ops);
247         if (ret)
248                 return ret;
249 #endif
250         pingv6_ops.ipv6_recv_error = ipv6_recv_error;
251         pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
252         pingv6_ops.ip6_datagram_recv_specific_ctl =
253                 ip6_datagram_recv_specific_ctl;
254         pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
255         pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
256         pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
257         return inet6_register_protosw(&pingv6_protosw);
258 }
259 
260 /* This never gets called because it's not possible to unload the ipv6 module,
261  * but just in case.
262  */
263 void pingv6_exit(void)
264 {
265         pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
266         pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
267         pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
268         pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
269         pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
270         pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
271 #ifdef CONFIG_PROC_FS
272         unregister_pernet_subsys(&ping_v6_net_ops);
273 #endif
274         inet6_unregister_protosw(&pingv6_protosw);
275 }
276 

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