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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 /* 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 oif = 0;
 59         struct flowi6 fl6;
 60         int err;
 61         struct dst_entry *dst;
 62         struct rt6_info *rt;
 63         struct pingfakehdr pfh;
 64         struct sockcm_cookie junk = {0};
 65         struct ipcm6_cookie ipc6;
 66 
 67         pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
 68 
 69         err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
 70                                   sizeof(user_icmph));
 71         if (err)
 72                 return err;
 73 
 74         if (msg->msg_name) {
 75                 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
 76                 if (msg->msg_namelen < sizeof(*u))
 77                         return -EINVAL;
 78                 if (u->sin6_family != AF_INET6) {
 79                         return -EAFNOSUPPORT;
 80                 }
 81                 daddr = &(u->sin6_addr);
 82                 if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr)))
 83                         oif = u->sin6_scope_id;
 84         } else {
 85                 if (sk->sk_state != TCP_ESTABLISHED)
 86                         return -EDESTADDRREQ;
 87                 daddr = &sk->sk_v6_daddr;
 88         }
 89 
 90         if (!oif)
 91                 oif = sk->sk_bound_dev_if;
 92 
 93         if (!oif)
 94                 oif = np->sticky_pktinfo.ipi6_ifindex;
 95 
 96         if (!oif && ipv6_addr_is_multicast(daddr))
 97                 oif = np->mcast_oif;
 98         else if (!oif)
 99                 oif = np->ucast_oif;
100 
101         addr_type = ipv6_addr_type(daddr);
102         if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) ||
103             (addr_type & IPV6_ADDR_MAPPED) ||
104             (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if))
105                 return -EINVAL;
106 
107         /* TODO: use ip6_datagram_send_ctl to get options from cmsg */
108 
109         memset(&fl6, 0, sizeof(fl6));
110 
111         fl6.flowi6_proto = IPPROTO_ICMPV6;
112         fl6.saddr = np->saddr;
113         fl6.daddr = *daddr;
114         fl6.flowi6_oif = oif;
115         fl6.flowi6_mark = sk->sk_mark;
116         fl6.flowi6_uid = sk->sk_uid;
117         fl6.fl6_icmp_type = user_icmph.icmp6_type;
118         fl6.fl6_icmp_code = user_icmph.icmp6_code;
119         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
120 
121         ipc6.tclass = np->tclass;
122         fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
123 
124         dst = ip6_sk_dst_lookup_flow(sk, &fl6,  daddr);
125         if (IS_ERR(dst))
126                 return PTR_ERR(dst);
127         rt = (struct rt6_info *) dst;
128 
129         if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
130                 fl6.flowi6_oif = np->mcast_oif;
131         else if (!fl6.flowi6_oif)
132                 fl6.flowi6_oif = np->ucast_oif;
133 
134         pfh.icmph.type = user_icmph.icmp6_type;
135         pfh.icmph.code = user_icmph.icmp6_code;
136         pfh.icmph.checksum = 0;
137         pfh.icmph.un.echo.id = inet->inet_sport;
138         pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
139         pfh.msg = msg;
140         pfh.wcheck = 0;
141         pfh.family = AF_INET6;
142 
143         ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
144         ipc6.dontfrag = np->dontfrag;
145         ipc6.opt = NULL;
146 
147         lock_sock(sk);
148         err = ip6_append_data(sk, ping_getfrag, &pfh, len,
149                               0, &ipc6, &fl6, rt,
150                               MSG_DONTWAIT, &junk);
151 
152         if (err) {
153                 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
154                                 ICMP6_MIB_OUTERRORS);
155                 ip6_flush_pending_frames(sk);
156         } else {
157                 err = icmpv6_push_pending_frames(sk, &fl6,
158                                                  (struct icmp6hdr *) &pfh.icmph,
159                                                  len);
160         }
161         release_sock(sk);
162 
163         dst_release(dst);
164 
165         if (err)
166                 return err;
167 
168         return len;
169 }
170 
171 struct proto pingv6_prot = {
172         .name =         "PINGv6",
173         .owner =        THIS_MODULE,
174         .init =         ping_init_sock,
175         .close =        ping_close,
176         .connect =      ip6_datagram_connect_v6_only,
177         .disconnect =   __udp_disconnect,
178         .setsockopt =   ipv6_setsockopt,
179         .getsockopt =   ipv6_getsockopt,
180         .sendmsg =      ping_v6_sendmsg,
181         .recvmsg =      ping_recvmsg,
182         .bind =         ping_bind,
183         .backlog_rcv =  ping_queue_rcv_skb,
184         .hash =         ping_hash,
185         .unhash =       ping_unhash,
186         .get_port =     ping_get_port,
187         .obj_size =     sizeof(struct raw6_sock),
188 };
189 EXPORT_SYMBOL_GPL(pingv6_prot);
190 
191 static struct inet_protosw pingv6_protosw = {
192         .type =      SOCK_DGRAM,
193         .protocol =  IPPROTO_ICMPV6,
194         .prot =      &pingv6_prot,
195         .ops =       &inet6_sockraw_ops,
196         .flags =     INET_PROTOSW_REUSE,
197 };
198 
199 #ifdef CONFIG_PROC_FS
200 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
201 {
202         return ping_seq_start(seq, pos, AF_INET6);
203 }
204 
205 static int ping_v6_seq_show(struct seq_file *seq, void *v)
206 {
207         if (v == SEQ_START_TOKEN) {
208                 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
209         } else {
210                 int bucket = ((struct ping_iter_state *) seq->private)->bucket;
211                 struct inet_sock *inet = inet_sk(v);
212                 __u16 srcp = ntohs(inet->inet_sport);
213                 __u16 destp = ntohs(inet->inet_dport);
214                 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
215         }
216         return 0;
217 }
218 
219 static struct ping_seq_afinfo ping_v6_seq_afinfo = {
220         .name           = "icmp6",
221         .family         = AF_INET6,
222         .seq_fops       = &ping_seq_fops,
223         .seq_ops        = {
224                 .start          = ping_v6_seq_start,
225                 .show           = ping_v6_seq_show,
226                 .next           = ping_seq_next,
227                 .stop           = ping_seq_stop,
228         },
229 };
230 
231 static int __net_init ping_v6_proc_init_net(struct net *net)
232 {
233         return ping_proc_register(net, &ping_v6_seq_afinfo);
234 }
235 
236 static void __net_init ping_v6_proc_exit_net(struct net *net)
237 {
238         return ping_proc_unregister(net, &ping_v6_seq_afinfo);
239 }
240 
241 static struct pernet_operations ping_v6_net_ops = {
242         .init = ping_v6_proc_init_net,
243         .exit = ping_v6_proc_exit_net,
244 };
245 #endif
246 
247 int __init pingv6_init(void)
248 {
249 #ifdef CONFIG_PROC_FS
250         int ret = register_pernet_subsys(&ping_v6_net_ops);
251         if (ret)
252                 return ret;
253 #endif
254         pingv6_ops.ipv6_recv_error = ipv6_recv_error;
255         pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
256         pingv6_ops.ip6_datagram_recv_specific_ctl =
257                 ip6_datagram_recv_specific_ctl;
258         pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
259         pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
260         pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
261         return inet6_register_protosw(&pingv6_protosw);
262 }
263 
264 /* This never gets called because it's not possible to unload the ipv6 module,
265  * but just in case.
266  */
267 void pingv6_exit(void)
268 {
269         pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
270         pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
271         pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
272         pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
273         pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
274         pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
275 #ifdef CONFIG_PROC_FS
276         unregister_pernet_subsys(&ping_v6_net_ops);
277 #endif
278         inet6_unregister_protosw(&pingv6_protosw);
279 }
280 

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