mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 16:23:20 +00:00
a693722aec
And thus when we try to use 'ss -danemi' on these sockets that have no ccid blocks (data collected using systemtap after I fixed the problem): dccp_diag_get_info sk=0xffff8801220a3100, dp->dccps_hc_rx_ccid=0x0000000000000000, dp->dccps_hc_tx_ccid=0x0000000000000000 We get an OOPS: mica.ghostprotocols.net login: BUG: unable to handle kernel NULL pointer dereferenc0 IP: [<ffffffffa0136082>] dccp_diag_get_info+0x82/0xc0 [dccp_diag] PGD 12106f067 PUD 122488067 PMD 0 Oops: 0000 [#1] PREEMPT Fix is trivial, and 'ss -d' is working again: [root@mica ~]# ss -danemi State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 0 *:5001 *:* ino:7288 sk:220a3100ffff8801 mem:(r0,w0,f0,t0) cwnd:0 ssthresh:0 [root@mica ~]# Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*
|
|
* net/dccp/diag.c
|
|
*
|
|
* An implementation of the DCCP protocol
|
|
* Arnaldo Carvalho de Melo <acme@mandriva.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/inet_diag.h>
|
|
|
|
#include "ccid.h"
|
|
#include "dccp.h"
|
|
|
|
static void dccp_get_info(struct sock *sk, struct tcp_info *info)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
const struct inet_connection_sock *icsk = inet_csk(sk);
|
|
|
|
memset(info, 0, sizeof(*info));
|
|
|
|
info->tcpi_state = sk->sk_state;
|
|
info->tcpi_retransmits = icsk->icsk_retransmits;
|
|
info->tcpi_probes = icsk->icsk_probes_out;
|
|
info->tcpi_backoff = icsk->icsk_backoff;
|
|
info->tcpi_pmtu = icsk->icsk_pmtu_cookie;
|
|
|
|
if (dp->dccps_hc_rx_ackvec != NULL)
|
|
info->tcpi_options |= TCPI_OPT_SACK;
|
|
|
|
if (dp->dccps_hc_rx_ccid != NULL)
|
|
ccid_hc_rx_get_info(dp->dccps_hc_rx_ccid, sk, info);
|
|
|
|
if (dp->dccps_hc_tx_ccid != NULL)
|
|
ccid_hc_tx_get_info(dp->dccps_hc_tx_ccid, sk, info);
|
|
}
|
|
|
|
static void dccp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
|
|
void *_info)
|
|
{
|
|
r->idiag_rqueue = r->idiag_wqueue = 0;
|
|
|
|
if (_info != NULL)
|
|
dccp_get_info(sk, _info);
|
|
}
|
|
|
|
static const struct inet_diag_handler dccp_diag_handler = {
|
|
.idiag_hashinfo = &dccp_hashinfo,
|
|
.idiag_get_info = dccp_diag_get_info,
|
|
.idiag_type = DCCPDIAG_GETSOCK,
|
|
.idiag_info_size = sizeof(struct tcp_info),
|
|
};
|
|
|
|
static int __init dccp_diag_init(void)
|
|
{
|
|
return inet_diag_register(&dccp_diag_handler);
|
|
}
|
|
|
|
static void __exit dccp_diag_fini(void)
|
|
{
|
|
inet_diag_unregister(&dccp_diag_handler);
|
|
}
|
|
|
|
module_init(dccp_diag_init);
|
|
module_exit(dccp_diag_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
|
|
MODULE_DESCRIPTION("DCCP inet_diag handler");
|
|
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_INET_DIAG, DCCPDIAG_GETSOCK);
|