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.
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.
13 * Based on ipv4/udp.c code.
15 * Authors: Vasiliy Kulikov / Openwall (for Linux 2.6),
16 * Pavel Kankovsky (for Linux 2.4.32)
18 * Pavel gave all rights to bugs to Vasiliy,
19 * none of the bugs are Pavel's now.
23 #include <linux/uaccess.h>
24 #include <linux/types.h>
25 #include <linux/fcntl.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
29 #include <linux/errno.h>
30 #include <linux/timer.h>
32 #include <linux/inet.h>
33 #include <linux/netdevice.h>
38 #include <net/protocol.h>
39 #include <linux/skbuff.h>
40 #include <linux/proc_fs.h>
41 #include <linux/export.h>
45 #include <net/route.h>
46 #include <net/inet_common.h>
47 #include <net/checksum.h>
50 static struct ping_table ping_table
;
52 static u16 ping_port_rover
;
54 static inline int ping_hashfn(struct net
*net
, unsigned int num
, unsigned int mask
)
56 int res
= (num
+ net_hash_mix(net
)) & mask
;
58 pr_debug("hash(%d) = %d\n", num
, res
);
62 static inline struct hlist_nulls_head
*ping_hashslot(struct ping_table
*table
,
63 struct net
*net
, unsigned int num
)
65 return &table
->hash
[ping_hashfn(net
, num
, PING_HTABLE_MASK
)];
68 static int ping_v4_get_port(struct sock
*sk
, unsigned short ident
)
70 struct hlist_nulls_node
*node
;
71 struct hlist_nulls_head
*hlist
;
72 struct inet_sock
*isk
, *isk2
;
73 struct sock
*sk2
= NULL
;
76 write_lock_bh(&ping_table
.lock
);
79 u16 result
= ping_port_rover
+ 1;
81 for (i
= 0; i
< (1L << 16); i
++, result
++) {
83 result
++; /* avoid zero */
84 hlist
= ping_hashslot(&ping_table
, sock_net(sk
),
86 ping_portaddr_for_each_entry(sk2
, node
, hlist
) {
89 if (isk2
->inet_num
== result
)
94 ping_port_rover
= ident
= result
;
102 hlist
= ping_hashslot(&ping_table
, sock_net(sk
), ident
);
103 ping_portaddr_for_each_entry(sk2
, node
, hlist
) {
106 if ((isk2
->inet_num
== ident
) &&
108 (!sk2
->sk_reuse
|| !sk
->sk_reuse
))
113 pr_debug("found port/ident = %d\n", ident
);
114 isk
->inet_num
= ident
;
115 if (sk_unhashed(sk
)) {
116 pr_debug("was not hashed\n");
118 hlist_nulls_add_head(&sk
->sk_nulls_node
, hlist
);
119 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, 1);
121 write_unlock_bh(&ping_table
.lock
);
125 write_unlock_bh(&ping_table
.lock
);
129 static void ping_v4_hash(struct sock
*sk
)
131 pr_debug("ping_v4_hash(sk->port=%u)\n", inet_sk(sk
)->inet_num
);
132 BUG(); /* "Please do not press this button again." */
135 static void ping_v4_unhash(struct sock
*sk
)
137 struct inet_sock
*isk
= inet_sk(sk
);
138 pr_debug("ping_v4_unhash(isk=%p,isk->num=%u)\n", isk
, isk
->inet_num
);
140 write_lock_bh(&ping_table
.lock
);
141 hlist_nulls_del(&sk
->sk_nulls_node
);
145 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
146 write_unlock_bh(&ping_table
.lock
);
150 static struct sock
*ping_v4_lookup(struct net
*net
, __be32 saddr
, __be32 daddr
,
153 struct hlist_nulls_head
*hslot
= ping_hashslot(&ping_table
, net
, ident
);
154 struct sock
*sk
= NULL
;
155 struct inet_sock
*isk
;
156 struct hlist_nulls_node
*hnode
;
158 pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
159 (int)ident
, &daddr
, dif
);
160 read_lock_bh(&ping_table
.lock
);
162 ping_portaddr_for_each_entry(sk
, hnode
, hslot
) {
165 pr_debug("found: %p: num = %d, daddr = %pI4, dif = %d\n", sk
,
166 (int)isk
->inet_num
, &isk
->inet_rcv_saddr
,
167 sk
->sk_bound_dev_if
);
169 pr_debug("iterate\n");
170 if (isk
->inet_num
!= ident
)
172 if (isk
->inet_rcv_saddr
&& isk
->inet_rcv_saddr
!= daddr
)
174 if (sk
->sk_bound_dev_if
&& sk
->sk_bound_dev_if
!= dif
)
183 read_unlock_bh(&ping_table
.lock
);
188 static void inet_get_ping_group_range_net(struct net
*net
, gid_t
*low
,
191 gid_t
*data
= net
->ipv4
.sysctl_ping_group_range
;
195 seq
= read_seqbegin(&sysctl_local_ports
.lock
);
199 } while (read_seqretry(&sysctl_local_ports
.lock
, seq
));
203 static int ping_init_sock(struct sock
*sk
)
205 struct net
*net
= sock_net(sk
);
206 gid_t group
= current_egid();
208 struct group_info
*group_info
= get_current_groups();
209 int i
, j
, count
= group_info
->ngroups
;
211 inet_get_ping_group_range_net(net
, range
, range
+1);
212 if (range
[0] <= group
&& group
<= range
[1])
215 for (i
= 0; i
< group_info
->nblocks
; i
++) {
216 int cp_count
= min_t(int, NGROUPS_PER_BLOCK
, count
);
218 for (j
= 0; j
< cp_count
; j
++) {
219 group
= group_info
->blocks
[i
][j
];
220 if (range
[0] <= group
&& group
<= range
[1])
230 static void ping_close(struct sock
*sk
, long timeout
)
232 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
233 inet_sk(sk
), inet_sk(sk
)->inet_num
);
234 pr_debug("isk->refcnt = %d\n", sk
->sk_refcnt
.counter
);
236 sk_common_release(sk
);
240 * We need our own bind because there are no privileged id's == local ports.
241 * Moreover, we don't allow binding to multi- and broadcast addresses.
244 static int ping_bind(struct sock
*sk
, struct sockaddr
*uaddr
, int addr_len
)
246 struct sockaddr_in
*addr
= (struct sockaddr_in
*)uaddr
;
247 struct inet_sock
*isk
= inet_sk(sk
);
252 if (addr_len
< sizeof(struct sockaddr_in
))
255 pr_debug("ping_v4_bind(sk=%p,sa_addr=%08x,sa_port=%d)\n",
256 sk
, addr
->sin_addr
.s_addr
, ntohs(addr
->sin_port
));
258 chk_addr_ret
= inet_addr_type(sock_net(sk
), addr
->sin_addr
.s_addr
);
259 if (addr
->sin_addr
.s_addr
== htonl(INADDR_ANY
))
260 chk_addr_ret
= RTN_LOCAL
;
262 if ((sysctl_ip_nonlocal_bind
== 0 &&
263 isk
->freebind
== 0 && isk
->transparent
== 0 &&
264 chk_addr_ret
!= RTN_LOCAL
) ||
265 chk_addr_ret
== RTN_MULTICAST
||
266 chk_addr_ret
== RTN_BROADCAST
)
267 return -EADDRNOTAVAIL
;
272 if (isk
->inet_num
!= 0)
276 isk
->inet_rcv_saddr
= isk
->inet_saddr
= addr
->sin_addr
.s_addr
;
277 snum
= ntohs(addr
->sin_port
);
278 if (ping_v4_get_port(sk
, snum
) != 0) {
279 isk
->inet_saddr
= isk
->inet_rcv_saddr
= 0;
283 pr_debug("after bind(): num = %d, daddr = %pI4, dif = %d\n",
285 &isk
->inet_rcv_saddr
,
286 (int)sk
->sk_bound_dev_if
);
289 if (isk
->inet_rcv_saddr
)
290 sk
->sk_userlocks
|= SOCK_BINDADDR_LOCK
;
292 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
293 isk
->inet_sport
= htons(isk
->inet_num
);
299 pr_debug("ping_v4_bind -> %d\n", err
);
304 * Is this a supported type of ICMP message?
307 static inline int ping_supported(int type
, int code
)
309 if (type
== ICMP_ECHO
&& code
== 0)
315 * This routine is called by the ICMP module when it gets some
316 * sort of error condition.
319 static int ping_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
);
321 void ping_err(struct sk_buff
*skb
, u32 info
)
323 struct iphdr
*iph
= (struct iphdr
*)skb
->data
;
324 struct icmphdr
*icmph
= (struct icmphdr
*)(skb
->data
+(iph
->ihl
<<2));
325 struct inet_sock
*inet_sock
;
326 int type
= icmph
->type
;
327 int code
= icmph
->code
;
328 struct net
*net
= dev_net(skb
->dev
);
333 /* We assume the packet has already been checked by icmp_unreach */
335 if (!ping_supported(icmph
->type
, icmph
->code
))
338 pr_debug("ping_err(type=%04x,code=%04x,id=%04x,seq=%04x)\n", type
,
339 code
, ntohs(icmph
->un
.echo
.id
), ntohs(icmph
->un
.echo
.sequence
));
341 sk
= ping_v4_lookup(net
, iph
->daddr
, iph
->saddr
,
342 ntohs(icmph
->un
.echo
.id
), skb
->dev
->ifindex
);
344 pr_debug("no socket, dropping\n");
345 return; /* No socket for error */
347 pr_debug("err on socket %p\n", sk
);
351 inet_sock
= inet_sk(sk
);
355 case ICMP_TIME_EXCEEDED
:
358 case ICMP_SOURCE_QUENCH
:
359 /* This is not a real error but ping wants to see it.
360 * Report it with some fake errno. */
363 case ICMP_PARAMETERPROB
:
367 case ICMP_DEST_UNREACH
:
368 if (code
== ICMP_FRAG_NEEDED
) { /* Path MTU discovery */
369 if (inet_sock
->pmtudisc
!= IP_PMTUDISC_DONT
) {
377 if (code
<= NR_ICMP_UNREACH
) {
378 harderr
= icmp_err_convert
[code
].fatal
;
379 err
= icmp_err_convert
[code
].errno
;
383 /* See ICMP_SOURCE_QUENCH */
389 * RFC1122: OK. Passes ICMP errors back to application, as per
392 if (!inet_sock
->recverr
) {
393 if (!harderr
|| sk
->sk_state
!= TCP_ESTABLISHED
)
396 ip_icmp_error(sk
, skb
, err
, 0 /* no remote port */,
400 sk
->sk_error_report(sk
);
406 * Copy and checksum an ICMP Echo packet from user space into a buffer.
410 struct icmphdr icmph
;
415 static int ping_getfrag(void *from
, char *to
,
416 int offset
, int fraglen
, int odd
, struct sk_buff
*skb
)
418 struct pingfakehdr
*pfh
= (struct pingfakehdr
*)from
;
421 if (fraglen
< sizeof(struct icmphdr
))
423 if (csum_partial_copy_fromiovecend(to
+ sizeof(struct icmphdr
),
424 pfh
->iov
, 0, fraglen
- sizeof(struct icmphdr
),
430 if (offset
< sizeof(struct icmphdr
))
432 if (csum_partial_copy_fromiovecend
433 (to
, pfh
->iov
, offset
- sizeof(struct icmphdr
),
434 fraglen
, &pfh
->wcheck
))
439 static int ping_push_pending_frames(struct sock
*sk
, struct pingfakehdr
*pfh
,
442 struct sk_buff
*skb
= skb_peek(&sk
->sk_write_queue
);
444 pfh
->wcheck
= csum_partial((char *)&pfh
->icmph
,
445 sizeof(struct icmphdr
), pfh
->wcheck
);
446 pfh
->icmph
.checksum
= csum_fold(pfh
->wcheck
);
447 memcpy(icmp_hdr(skb
), &pfh
->icmph
, sizeof(struct icmphdr
));
448 skb
->ip_summed
= CHECKSUM_NONE
;
449 return ip_push_pending_frames(sk
, fl4
);
452 static int ping_sendmsg(struct kiocb
*iocb
, struct sock
*sk
, struct msghdr
*msg
,
455 struct net
*net
= sock_net(sk
);
457 struct inet_sock
*inet
= inet_sk(sk
);
458 struct ipcm_cookie ipc
;
459 struct icmphdr user_icmph
;
460 struct pingfakehdr pfh
;
461 struct rtable
*rt
= NULL
;
462 struct ip_options_data opt_copy
;
464 __be32 saddr
, daddr
, faddr
;
468 pr_debug("ping_sendmsg(sk=%p,sk->num=%u)\n", inet
, inet
->inet_num
);
478 /* Mirror BSD error message compatibility */
479 if (msg
->msg_flags
& MSG_OOB
)
483 * Fetch the ICMP header provided by the userland.
487 if (memcpy_fromiovec((u8
*)&user_icmph
, msg
->msg_iov
,
488 sizeof(struct icmphdr
)))
490 if (!ping_supported(user_icmph
.type
, user_icmph
.code
))
494 * Get and verify the address.
498 struct sockaddr_in
*usin
= (struct sockaddr_in
*)msg
->msg_name
;
499 if (msg
->msg_namelen
< sizeof(*usin
))
501 if (usin
->sin_family
!= AF_INET
)
503 daddr
= usin
->sin_addr
.s_addr
;
506 if (sk
->sk_state
!= TCP_ESTABLISHED
)
507 return -EDESTADDRREQ
;
508 daddr
= inet
->inet_daddr
;
512 ipc
.addr
= inet
->inet_saddr
;
514 ipc
.oif
= sk
->sk_bound_dev_if
;
516 err
= sock_tx_timestamp(sk
, &ipc
.tx_flags
);
520 if (msg
->msg_controllen
) {
521 err
= ip_cmsg_send(sock_net(sk
), msg
, &ipc
);
528 struct ip_options_rcu
*inet_opt
;
531 inet_opt
= rcu_dereference(inet
->inet_opt
);
533 memcpy(&opt_copy
, inet_opt
,
534 sizeof(*inet_opt
) + inet_opt
->opt
.optlen
);
535 ipc
.opt
= &opt_copy
.opt
;
541 ipc
.addr
= faddr
= daddr
;
543 if (ipc
.opt
&& ipc
.opt
->opt
.srr
) {
546 faddr
= ipc
.opt
->opt
.faddr
;
548 tos
= RT_TOS(inet
->tos
);
549 if (sock_flag(sk
, SOCK_LOCALROUTE
) ||
550 (msg
->msg_flags
& MSG_DONTROUTE
) ||
551 (ipc
.opt
&& ipc
.opt
->opt
.is_strictroute
)) {
555 if (ipv4_is_multicast(daddr
)) {
557 ipc
.oif
= inet
->mc_index
;
559 saddr
= inet
->mc_addr
;
561 ipc
.oif
= inet
->uc_index
;
563 flowi4_init_output(&fl4
, ipc
.oif
, sk
->sk_mark
, tos
,
564 RT_SCOPE_UNIVERSE
, sk
->sk_protocol
,
565 inet_sk_flowi_flags(sk
), faddr
, saddr
, 0, 0);
567 security_sk_classify_flow(sk
, flowi4_to_flowi(&fl4
));
568 rt
= ip_route_output_flow(net
, &fl4
, sk
);
572 if (err
== -ENETUNREACH
)
573 IP_INC_STATS_BH(net
, IPSTATS_MIB_OUTNOROUTES
);
578 if ((rt
->rt_flags
& RTCF_BROADCAST
) &&
579 !sock_flag(sk
, SOCK_BROADCAST
))
582 if (msg
->msg_flags
& MSG_CONFIRM
)
587 ipc
.addr
= fl4
.daddr
;
591 pfh
.icmph
.type
= user_icmph
.type
; /* already checked */
592 pfh
.icmph
.code
= user_icmph
.code
; /* ditto */
593 pfh
.icmph
.checksum
= 0;
594 pfh
.icmph
.un
.echo
.id
= inet
->inet_sport
;
595 pfh
.icmph
.un
.echo
.sequence
= user_icmph
.un
.echo
.sequence
;
596 pfh
.iov
= msg
->msg_iov
;
599 err
= ip_append_data(sk
, &fl4
, ping_getfrag
, &pfh
, len
,
600 0, &ipc
, &rt
, msg
->msg_flags
);
602 ip_flush_pending_frames(sk
);
604 err
= ping_push_pending_frames(sk
, &pfh
, &fl4
);
612 icmp_out_count(sock_net(sk
), user_icmph
.type
);
618 dst_confirm(&rt
->dst
);
619 if (!(msg
->msg_flags
& MSG_PROBE
) || len
)
620 goto back_from_confirm
;
625 static int ping_recvmsg(struct kiocb
*iocb
, struct sock
*sk
, struct msghdr
*msg
,
626 size_t len
, int noblock
, int flags
, int *addr_len
)
628 struct inet_sock
*isk
= inet_sk(sk
);
629 struct sockaddr_in
*sin
= (struct sockaddr_in
*)msg
->msg_name
;
633 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk
, isk
->inet_num
);
640 *addr_len
= sizeof(*sin
);
642 if (flags
& MSG_ERRQUEUE
)
643 return ip_recv_error(sk
, msg
, len
);
645 skb
= skb_recv_datagram(sk
, flags
, noblock
, &err
);
651 msg
->msg_flags
|= MSG_TRUNC
;
655 /* Don't bother checking the checksum */
656 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
660 sock_recv_timestamp(msg
, sk
, skb
);
662 /* Copy the address. */
664 sin
->sin_family
= AF_INET
;
665 sin
->sin_port
= 0 /* skb->h.uh->source */;
666 sin
->sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
667 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
670 ip_cmsg_recv(msg
, skb
);
674 skb_free_datagram(sk
, skb
);
676 pr_debug("ping_recvmsg -> %d\n", err
);
680 static int ping_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
682 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
683 inet_sk(sk
), inet_sk(sk
)->inet_num
, skb
);
684 if (sock_queue_rcv_skb(sk
, skb
) < 0) {
686 pr_debug("ping_queue_rcv_skb -> failed\n");
694 * All we need to do is get the socket.
697 void ping_rcv(struct sk_buff
*skb
)
700 struct net
*net
= dev_net(skb
->dev
);
701 struct iphdr
*iph
= ip_hdr(skb
);
702 struct icmphdr
*icmph
= icmp_hdr(skb
);
703 __be32 saddr
= iph
->saddr
;
704 __be32 daddr
= iph
->daddr
;
706 /* We assume the packet has already been checked by icmp_rcv */
708 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
709 skb
, ntohs(icmph
->un
.echo
.id
), ntohs(icmph
->un
.echo
.sequence
));
711 /* Push ICMP header back */
712 skb_push(skb
, skb
->data
- (u8
*)icmph
);
714 sk
= ping_v4_lookup(net
, saddr
, daddr
, ntohs(icmph
->un
.echo
.id
),
717 pr_debug("rcv on socket %p\n", sk
);
718 ping_queue_rcv_skb(sk
, skb_get(skb
));
722 pr_debug("no socket, dropping\n");
724 /* We're called from icmp_rcv(). kfree_skb() is done there. */
727 struct proto ping_prot
= {
729 .owner
= THIS_MODULE
,
730 .init
= ping_init_sock
,
732 .connect
= ip4_datagram_connect
,
733 .disconnect
= udp_disconnect
,
734 .setsockopt
= ip_setsockopt
,
735 .getsockopt
= ip_getsockopt
,
736 .sendmsg
= ping_sendmsg
,
737 .recvmsg
= ping_recvmsg
,
739 .backlog_rcv
= ping_queue_rcv_skb
,
740 .hash
= ping_v4_hash
,
741 .unhash
= ping_v4_unhash
,
742 .get_port
= ping_v4_get_port
,
743 .obj_size
= sizeof(struct inet_sock
),
745 EXPORT_SYMBOL(ping_prot
);
747 #ifdef CONFIG_PROC_FS
749 static struct sock
*ping_get_first(struct seq_file
*seq
, int start
)
752 struct ping_iter_state
*state
= seq
->private;
753 struct net
*net
= seq_file_net(seq
);
755 for (state
->bucket
= start
; state
->bucket
< PING_HTABLE_SIZE
;
757 struct hlist_nulls_node
*node
;
758 struct hlist_nulls_head
*hslot
;
760 hslot
= &ping_table
.hash
[state
->bucket
];
762 if (hlist_nulls_empty(hslot
))
765 sk_nulls_for_each(sk
, node
, hslot
) {
766 if (net_eq(sock_net(sk
), net
))
775 static struct sock
*ping_get_next(struct seq_file
*seq
, struct sock
*sk
)
777 struct ping_iter_state
*state
= seq
->private;
778 struct net
*net
= seq_file_net(seq
);
781 sk
= sk_nulls_next(sk
);
782 } while (sk
&& (!net_eq(sock_net(sk
), net
)));
785 return ping_get_first(seq
, state
->bucket
+ 1);
789 static struct sock
*ping_get_idx(struct seq_file
*seq
, loff_t pos
)
791 struct sock
*sk
= ping_get_first(seq
, 0);
794 while (pos
&& (sk
= ping_get_next(seq
, sk
)) != NULL
)
796 return pos
? NULL
: sk
;
799 static void *ping_seq_start(struct seq_file
*seq
, loff_t
*pos
)
801 struct ping_iter_state
*state
= seq
->private;
804 read_lock_bh(&ping_table
.lock
);
806 return *pos
? ping_get_idx(seq
, *pos
-1) : SEQ_START_TOKEN
;
809 static void *ping_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
813 if (v
== SEQ_START_TOKEN
)
814 sk
= ping_get_idx(seq
, 0);
816 sk
= ping_get_next(seq
, v
);
822 static void ping_seq_stop(struct seq_file
*seq
, void *v
)
824 read_unlock_bh(&ping_table
.lock
);
827 static void ping_format_sock(struct sock
*sp
, struct seq_file
*f
,
828 int bucket
, int *len
)
830 struct inet_sock
*inet
= inet_sk(sp
);
831 __be32 dest
= inet
->inet_daddr
;
832 __be32 src
= inet
->inet_rcv_saddr
;
833 __u16 destp
= ntohs(inet
->inet_dport
);
834 __u16 srcp
= ntohs(inet
->inet_sport
);
836 seq_printf(f
, "%5d: %08X:%04X %08X:%04X"
837 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n",
838 bucket
, src
, srcp
, dest
, destp
, sp
->sk_state
,
839 sk_wmem_alloc_get(sp
),
840 sk_rmem_alloc_get(sp
),
841 0, 0L, 0, sock_i_uid(sp
), 0, sock_i_ino(sp
),
842 atomic_read(&sp
->sk_refcnt
), sp
,
843 atomic_read(&sp
->sk_drops
), len
);
846 static int ping_seq_show(struct seq_file
*seq
, void *v
)
848 if (v
== SEQ_START_TOKEN
)
849 seq_printf(seq
, "%-127s\n",
850 " sl local_address rem_address st tx_queue "
851 "rx_queue tr tm->when retrnsmt uid timeout "
852 "inode ref pointer drops");
854 struct ping_iter_state
*state
= seq
->private;
857 ping_format_sock(v
, seq
, state
->bucket
, &len
);
858 seq_printf(seq
, "%*s\n", 127 - len
, "");
863 static const struct seq_operations ping_seq_ops
= {
864 .show
= ping_seq_show
,
865 .start
= ping_seq_start
,
866 .next
= ping_seq_next
,
867 .stop
= ping_seq_stop
,
870 static int ping_seq_open(struct inode
*inode
, struct file
*file
)
872 return seq_open_net(inode
, file
, &ping_seq_ops
,
873 sizeof(struct ping_iter_state
));
876 static const struct file_operations ping_seq_fops
= {
877 .open
= ping_seq_open
,
880 .release
= seq_release_net
,
883 static int ping_proc_register(struct net
*net
)
885 struct proc_dir_entry
*p
;
888 p
= proc_net_fops_create(net
, "icmp", S_IRUGO
, &ping_seq_fops
);
894 static void ping_proc_unregister(struct net
*net
)
896 proc_net_remove(net
, "icmp");
900 static int __net_init
ping_proc_init_net(struct net
*net
)
902 return ping_proc_register(net
);
905 static void __net_exit
ping_proc_exit_net(struct net
*net
)
907 ping_proc_unregister(net
);
910 static struct pernet_operations ping_net_ops
= {
911 .init
= ping_proc_init_net
,
912 .exit
= ping_proc_exit_net
,
915 int __init
ping_proc_init(void)
917 return register_pernet_subsys(&ping_net_ops
);
920 void ping_proc_exit(void)
922 unregister_pernet_subsys(&ping_net_ops
);
927 void __init
ping_init(void)
931 for (i
= 0; i
< PING_HTABLE_SIZE
; i
++)
932 INIT_HLIST_NULLS_HEAD(&ping_table
.hash
[i
], i
);
933 rwlock_init(&ping_table
.lock
);