使用Crash工具查看一个TCP listen sock内存布局实例

利用crash工具，我们可以很方便的查看正在运行内核的一些全局变量的数据结构，如TCP的ehash、bhash哈希桶，全局变量的查看比较简单。Crash工具还允许我们查看调用堆栈内部的局部变量，下面示例查看一个进程的listen sock结构（实际上从file->private_data中查看更为方便）

******@Inspiron:~$nc -lk 45678
#接着在另一个终端上运行下面命令
root@Inspiron:/home/******$ps -aux | grep 45678
******
5184 0.0 0.0 9184 816 pts/23 S+ 23:20 0:00 nc -lk 45678
root 5187 0.0 0.0 15984 944 pts/20 S+ 23:20 0:00 grep --color=auto 45678
root@Inspiron:/home/******$crash
crash 7.1.4
This program is free software, covered by the GNU GeneralPublicLicense,
and you are welcome to change it and/or distribute copies of it under
certain conditions. Enter"help copying" to see the conditions.
This program has absolutely no warranty. Enter"help warranty"for details.
GNU gdb (GDB)7.6
Copyright(C)2013FreeSoftwareFoundation,Inc.
LicenseGPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type"show copying"
and "show warranty"for details.
This GDB was configured as "x86_64-unknown-linux-gnu"...
crash: read error: kernel virtual address: ffffffff81a11e30 type:"cpu_possible_mask"
crash: this kernel may be configured with CONFIG_STRICT_DEVMEM, which
renders /dev/mem unusable as a live memory source.
crash: trying /proc/kcore as an alternative to /dev/mem
KERNEL:/lib/modules/4.4.13+/build/vmlinux
DUMPFILE:/proc/kcore
CPUS:4
DATE:MonNov 723:20:532016
UPTIME:02:28:15
LOAD AVERAGE:1.10,0.86,0.77
TASKS:663
NODENAME: ******-Inspiron-N5010
RELEASE:4.4.13+
VERSION:#5 SMP Sat Nov 5 15:51:12 CST 2016
MACHINE: x86_64 (2526Mhz)
MEMORY:3.9 GB
PID:5191
COMMAND:"crash"
TASK: ffff88006fc80000 [THREAD_INFO: ffff8800672bc000]
CPU:1
STATE: TASK_RUNNING (ACTIVE)
crash>set pid 5184
set: invalid task or pid value: pid
PID:5184
COMMAND:"nc"
TASK: ffff880035687080 [THREAD_INFO: ffff88006ca34000]
CPU:2
STATE: TASK_INTERRUPTIBLE
crash> bt
PID:5184 TASK: ffff880035687080 CPU:2 COMMAND:"nc"
#0 [ffff88006ca37ca0] __schedule at ffffffff81825b8e
#1 [ffff88006ca37cf0] schedule at ffffffff81826275
#2 [ffff88006ca37d08] schedule_timeout at ffffffff81829395
#3 [ffff88006ca37db8] inet_csk_accept at ffffffff81766b8b
#4 [ffff88006ca37e30] inet_accept at ffffffff8179897c
#5 [ffff88006ca37e68] SYSC_accept4 at ffffffff816fe523
#6 [ffff88006ca37f40] sys_accept at ffffffff81700110
#7 [ffff88006ca37f50] entry_SYSCALL_64_fastpath at ffffffff8182a372
RIP:00007fb0c2b504b0 RSP:00007ffd3bde40c8 RFLAGS:00000246
RAX: ffffffffffffffda RBX:0000000001978010 RCX:00007fb0c2b504b0
RDX:00007ffd3bde4154 RSI:00007ffd3bde41e0 RDI:0000000000000003
RBP:0000000000000000 R8:0000000000000000 R9:0000000000000000
R10:000000000000071a R11:0000000000000246 R12:0000000000000005
R13:0000000000405a21 R14:0000000000000000 R15:0000000000000000
ORIG_RAX:000000000000002b CS:0033 SS:002b
crash> bt -f
PID:5184 TASK: ffff880035687080 CPU:2 COMMAND:"nc"
#0 [ffff88006ca37ca0] __schedule at ffffffff81825b8e
ffff88006ca37ca8: ffffffff811e9d79 ffff880132818c80
ffff88006ca37cb8: ffff880035687080 ffff88006ca38000
ffff88006ca37cc8: ffff88006ca37e3c 7fffffffffffffff
ffff88006ca37cd8: ffff880035687080 ffff880106ad8780
ffff88006ca37ce8: ffff88006ca37d00 ffffffff81826275
#1 [ffff88006ca37cf0] schedule at ffffffff81826275
ffff88006ca37cf8:7fffffffffffffff ffff88006ca37db0
ffff88006ca37d08: ffffffff81829395
#2 [ffff88006ca37d08] schedule_timeout at ffffffff81829395
ffff88006ca37d10:7fffffffffffffff ffffffff81d6021d
ffff88006ca37d20:00000000000000000000000000000000
ffff88006ca37d30:00000000000000000000000000000000
ffff88006ca37d40:00000000000000000000000600000001
ffff88006ca37d50:00000000000000000000000000000246
ffff88006ca37d60:7fffffffffffffff ffff88006ca37d78
ffff88006ca37d70: ffffffff81829eae 0000000028c4ff93
ffff88006ca37d80: ffffffff817033ad 7fffffffffffffff
ffff88006ca37d90: ffff88006ca37e3c 7fffffffffffffff
ffff88006ca37da0: ffff880035687080 ffff880106ad8780
ffff88006ca37db0: ffff88006ca37e28 ffffffff81766b8b
#3 [ffff88006ca37db8] inet_csk_accept at ffffffff81766b8b
ffff88006ca37dc0: ffff880035687080 ffff880035687080
ffff88006ca37dd0:0000000000000001 ffff880035687080
ffff88006ca37de0: ffffffff810c2a80 ffff88006c990908
ffff88006ca37df0: ffff88006c990908 0000000028c4ff93
ffff88006ca37e00: ffff88009a505b80 ffff88009a505400
ffff88006ca37e10:000000000000000400007ffd3bde41e0
ffff88006ca37e20: ffff88009a505400 ffff88006ca37e60
#从inet_csk_accept反汇编代码中可以确定listen sock存储与R15寄存器，在函数调用过程中，R15寄存器存于调用堆栈中，如下代码push %r15
crash> dis -l schedule_timeout
/home/******/MyRes/linux-source-4.4.0/kernel/time/timer.c:1494
0xffffffff818291e0<schedule_timeout>: data32 data32 data32 xchg %ax,%ax [FTRACE NOP]
0xffffffff818291e5<schedule_timeout+5>: push %rbp
0xffffffff818291e6<schedule_timeout+6>: mov %rsp,%rbp
0xffffffff818291e9<schedule_timeout+9>: push %r15
0xffffffff818291eb<schedule_timeout+11>: push %r14
0xffffffff818291ed<schedule_timeout+13>: push %r13
0xffffffff818291ef<schedule_timeout+15>: push %r12
0xffffffff818291f1<schedule_timeout+17>: push %rbx
0xffffffff818291f2<schedule_timeout+18>: and $0xfffffffffffffff0,%rsp
0xffffffff818291f6<schedule_timeout+22>: sub $0x70,%rsp
0xffffffff818291fa<schedule_timeout+26>: mov %gs:0x28,%rax
0xffffffff81829203<schedule_timeout+35>: mov %rax,0x68(%rsp)
0xffffffff81829208<schedule_timeout+40>: xor %eax,%eax
/home/******/MyRes/linux-source-4.4.0/kernel/time/timer.c:1498
0xffffffff8182920a<schedule_timeout+42>: movabs $0x7fffffffffffffff,%rax
0xffffffff81829214<schedule_timeout+52>: cmp %rax,%rdi
0xffffffff81829217<schedule_timeout+55>: je 0xffffffff8182938c<schedule_timeout+428>
/home/******/MyRes/linux-source-4.4.0/kernel/time/timer.c:1518
0xffffffff8182921d<schedule_timeout+61>: test %rdi,%rdi
0xffffffff81829220<schedule_timeout+64>: js 0xffffffff81829422<schedule_timeout+578>
/home/******/MyRes/linux-source-4.4.0/kernel/time/timer.c:1527
#从bt -f显示的调用堆栈中确定在运行inet_csk_accept函数的时候，R15寄存器的值为ffff880106ad8780，取出listen sock地址
crash> struct sock ffff880106ad8780
struct sock {
__sk_common ={
{
skc_addrpair =0,
{
skc_daddr =0,
skc_rcv_saddr =0
}
},
{
skc_hash =0,
skc_u16hashes ={0,0}
},
{
skc_portpair =2993553408,
{
skc_dport =0,
skc_num =45678
}
},
skc_family =2,
skc_state =10' ',
skc_reuse =1'01',
skc_reuseport =0'00',
skc_ipv6only =0'00',
skc_net_refcnt =1'01',
debug =0'00',
skc_bound_dev_if =0,
{
skc_bind_node ={
next =0x0,
pprev =0xffff88006c9909e8
},
skc_portaddr_node ={
next =0x0,
pprev =0xffff88006c9909e8
}
},
skc_prot =0xffffffff81efa160<tcp_prot>,
skc_net ={
net =0xffffffff81ef3e00<init_net>
},
skc_v6_daddr ={
in6_u ={
u6_addr8 ="000000000000000000000000000000",
u6_addr16 ={0,0,0,0,0,0,0,0},
u6_addr32 ={0,0,0,0}
}
},
skc_v6_rcv_saddr ={
in6_u ={
u6_addr8 ="000000000000000000000000000000",
u6_addr16 ={0,0,0,0,0,0,0,0},
u6_addr32 ={0,0,0,0}
}
},
skc_cookie ={
counter =0
},
{
skc_flags =768,
skc_listener =0x300,
skc_tw_dr =0x300
},
skc_dontcopy_begin =0xffff880106ad87e8,
{
skc_node ={
next =0x4000000d,
pprev =0xffffffff821f61a8<tcp_hashinfo+168>
},
skc_nulls_node ={
next =0x4000000d,
pprev =0xffffffff821f61a8<tcp_hashinfo+168>
}
},
skc_tx_queue_mapping =-1,
{
skc_incoming_cpu =-1,
skc_rcv_wnd =4294967295,
skc_tw_rcv_nxt =4294967295
},
skc_refcnt ={
counter =1
},
skc_dontcopy_end =0xffff880106ad8804,
{
skc_rxhash =0,
skc_window_clamp =0,
skc_tw_snd_nxt =0
}
},
sk_lock ={
slock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
},
owned =0,
wq ={
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
},
task_list ={
next =0xffff880106ad8818,
prev =0xffff880106ad8818
}
}
},
sk_receive_queue ={
next =0xffff880106ad8828,
prev =0xffff880106ad8828,
qlen =0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
}
},
sk_backlog ={
rmem_alloc ={
counter =0
},
len =0,
head =0x0,
tail =0x0
},
sk_forward_alloc =0,
sk_txhash =0,
sk_napi_id =0,
sk_ll_usec =0,
sk_drops ={
counter =0
},
sk_rcvbuf =87380,
sk_filter =0x0,
{
sk_wq =0xffff88006c990900,
sk_wq_raw =0xffff88006c990900
},
sk_policy ={0x0,0x0},
sk_rx_dst =0x0,
sk_dst_cache =0x0,
sk_wmem_alloc ={
counter =1
},
sk_omem_alloc ={
counter =0
},
sk_sndbuf =16384,
sk_write_queue ={
next =0xffff880106ad88b0,
prev =0xffff880106ad88b0,
qlen =0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
}
},
sk_shutdown =0,
sk_no_check_tx =0,
sk_no_check_rx =0,
sk_userlocks =8,
sk_protocol =6,
sk_type =1,
sk_wmem_queued =0,
sk_allocation =37748928,
sk_pacing_rate =4294967295,
sk_max_pacing_rate =4294967295,
sk_route_caps =0,
sk_route_nocaps =0,
sk_gso_type =0,
sk_gso_max_size =0,
sk_gso_max_segs =0,
sk_rcvlowat =1,
sk_lingertime =0,
sk_error_queue ={
next =0xffff880106ad8908,
prev =0xffff880106ad8908,
qlen =0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
}
},
sk_prot_creator =0xffffffff81efa160<tcp_prot>,
sk_callback_lock ={
raw_lock ={
cnts ={
counter =0
},
wait_lock ={
val ={
counter =0
}
}
}
},
sk_err =0,
sk_err_soft =0,
sk_ack_backlog =0,
sk_max_ack_backlog =1,
sk_priority =0,
sk_cgrp_prioidx =1,
sk_peer_pid =0x0,
sk_peer_cred =0x0,
sk_rcvtimeo =9223372036854775807,
sk_sndtimeo =9223372036854775807,
sk_timer ={
entry ={
next =0x0,
pprev =0x0
},
expires =0,
function=0xffffffff8177d710<tcp_keepalive_timer>,
data =18446612136721221504,
flags =2,
slack =-1,
start_pid =-1,
start_site =0x0,
start_comm ="000000000000000000000000000000"
},
sk_stamp ={
tv64 =-1000000000
},
sk_tsflags =0,
sk_tskey =0,
sk_socket =0xffff88009a505b80,
sk_user_data =0x0,
sk_frag ={
page =0x0,
offset =0,
size =0
},
sk_send_head =0x0,
sk_peek_off =-1,
sk_write_pending =0,
sk_security =0xffff88006caaf340,
sk_mark =0,
sk_classid =0,
sk_cgrp =0x0,
sk_state_change =0xffffffff81701ee0<sock_def_wakeup>,
sk_data_ready =0xffffffff81702930<sock_def_readable>,
sk_write_space =0xffffffff8170f670<sk_stream_write_space>,
sk_error_report =0xffffffff81702840<sock_def_error_report>,
sk_backlog_rcv =0xffffffff81781da0<tcp_v4_do_rcv>,
sk_destruct =0xffffffff817998f0<inet_sock_destruct>
}
crash> struct inet_connection_sock ffff880106ad8780
struct inet_connection_sock {
icsk_inet ={
sk ={
__sk_common ={
{
skc_addrpair =0,
{
skc_daddr =0,
skc_rcv_saddr =0
}
},
{
skc_hash =0,
skc_u16hashes ={0,0}
},
{
skc_portpair =2993553408,
{
skc_dport =0,
skc_num =45678
}
},
skc_family =2,
skc_state =10' ',
skc_reuse =1'01',
skc_reuseport =0'00',
skc_ipv6only =0'00',
skc_net_refcnt =1'01',
debug =0'00',
skc_bound_dev_if =0,
{
skc_bind_node ={
next =0x0,
pprev =0xffff88006c9909e8
},
skc_portaddr_node ={
next =0x0,
pprev =0xffff88006c9909e8
}
},
skc_prot =0xffffffff81efa160<tcp_prot>,
skc_net ={
net =0xffffffff81ef3e00<init_net>
},
skc_v6_daddr ={
in6_u ={
u6_addr8 ="000000000000000000000000000000",
u6_addr16 ={0,0,0,0,0,0,0,0},
u6_addr32 ={0,0,0,0}
}
},
skc_v6_rcv_saddr ={
in6_u ={
u6_addr8 ="000000000000000000000000000000",
u6_addr16 ={0,0,0,0,0,0,0,0},
u6_addr32 ={0,0,0,0}
}
},
skc_cookie ={
counter =0
},
{
skc_flags =768,
skc_listener =0x300,
skc_tw_dr =0x300
},
skc_dontcopy_begin =0xffff880106ad87e8,
{
skc_node ={
next =0x4000000d,
pprev =0xffffffff821f61a8<tcp_hashinfo+168>
},
skc_nulls_node ={
next =0x4000000d,
pprev =0xffffffff821f61a8<tcp_hashinfo+168>
}
},
skc_tx_queue_mapping =-1,
{
skc_incoming_cpu =-1,
skc_rcv_wnd =4294967295,
skc_tw_rcv_nxt =4294967295
},
skc_refcnt ={
counter =1
},
skc_dontcopy_end =0xffff880106ad8804,
{
skc_rxhash =0,
skc_window_clamp =0,
skc_tw_snd_nxt =0
}
},
sk_lock ={
slock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
},
owned =0,
wq ={
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
},
task_list ={
next =0xffff880106ad8818,
prev =0xffff880106ad8818
}
}
},
sk_receive_queue ={
next =0xffff880106ad8828,
prev =0xffff880106ad8828,
qlen =0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
}
},
sk_backlog ={
rmem_alloc ={
counter =0
},
len =0,
head =0x0,
tail =0x0
},
sk_forward_alloc =0,
sk_txhash =0,
sk_napi_id =0,
sk_ll_usec =0,
sk_drops ={
counter =0
},
sk_rcvbuf =87380,
sk_filter =0x0,
{
sk_wq =0xffff88006c990900,
sk_wq_raw =0xffff88006c990900
},
sk_policy ={0x0,0x0},
sk_rx_dst =0x0,
sk_dst_cache =0x0,
sk_wmem_alloc ={
counter =1
},
sk_omem_alloc ={
counter =0
},
sk_sndbuf =16384,
sk_write_queue ={
next =0xffff880106ad88b0,
prev =0xffff880106ad88b0,
qlen =0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
}
},
sk_shutdown =0,
sk_no_check_tx =0,
sk_no_check_rx =0,
sk_userlocks =8,
sk_protocol =6,
sk_type =1,
sk_wmem_queued =0,
sk_allocation =37748928,
sk_pacing_rate =4294967295,
sk_max_pacing_rate =4294967295,
sk_route_caps =0,
sk_route_nocaps =0,
sk_gso_type =0,
sk_gso_max_size =0,
sk_gso_max_segs =0,
sk_rcvlowat =1,
sk_lingertime =0,
sk_error_queue ={
next =0xffff880106ad8908,
prev =0xffff880106ad8908,
qlen =0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
}
},
sk_prot_creator =0xffffffff81efa160<tcp_prot>,
sk_callback_lock ={
raw_lock ={
cnts ={
counter =0
},
wait_lock ={
val ={
counter =0
}
}
}
},
sk_err =0,
sk_err_soft =0,
sk_ack_backlog =0,
sk_max_ack_backlog =1,
sk_priority =0,
sk_cgrp_prioidx =1,
sk_peer_pid =0x0,
sk_peer_cred =0x0,
sk_rcvtimeo =9223372036854775807,
sk_sndtimeo =9223372036854775807,
sk_timer ={
entry ={
next =0x0,
pprev =0x0
},
expires =0,
function=0xffffffff8177d710<tcp_keepalive_timer>,
data =18446612136721221504,
flags =2,
slack =-1,
start_pid =-1,
start_site =0x0,
start_comm ="000000000000000000000000000000"
},
sk_stamp ={
tv64 =-1000000000
},
sk_tsflags =0,
sk_tskey =0,
sk_socket =0xffff88009a505b80,
sk_user_data =0x0,
sk_frag ={
page =0x0,
offset =0,
size =0
},
sk_send_head =0x0,
sk_peek_off =-1,
sk_write_pending =0,
sk_security =0xffff88006caaf340,
sk_mark =0,
sk_classid =0,
sk_cgrp =0x0,
sk_state_change =0xffffffff81701ee0<sock_def_wakeup>,
sk_data_ready =0xffffffff81702930<sock_def_readable>,
sk_write_space =0xffffffff8170f670<sk_stream_write_space>,
sk_error_report =0xffffffff81702840<sock_def_error_report>,
sk_backlog_rcv =0xffffffff81781da0<tcp_v4_do_rcv>,
sk_destruct =0xffffffff817998f0<inet_sock_destruct>
},
pinet6 =0x0,
inet_saddr =0,
uc_ttl =-1,
cmsg_flags =0,
inet_sport =28338,
inet_id =0,
inet_opt =0x0,
rx_dst_ifindex =0,
tos =0'00',
min_ttl =0'00',
mc_ttl =1'01',
pmtudisc =1'01',
recverr =0'00',
is_icsk =1'01',
freebind =0'00',
hdrincl =0'00',
mc_loop =1'01',
transparent =0'00',
mc_all =1'01',
nodefrag =0'00',
bind_address_no_port =0'00',
rcv_tos =0'00',
convert_csum =0'00',
uc_index =0,
mc_index =0,
mc_addr =0,
mc_list =0x0,
cork ={
base ={
flags =0,
addr =0,
opt =0x0,
fragsize =0,
length =0,
dst =0x0,
tx_flags =0'00',
ttl =0'00',
tos =0,
priority =0'00'
},
fl ={
u ={
__fl_common ={
flowic_oif =0,
flowic_iif =0,
flowic_mark =0,
flowic_tos =0'00',
flowic_scope =0'00',
flowic_proto =0'00',
flowic_flags =0'00',
flowic_secid =0,
flowic_tun_key ={
tun_id =0
}
},
ip4 ={
__fl_common ={
flowic_oif =0,
flowic_iif =0,
flowic_mark =0,
flowic_tos =0'00',
flowic_scope =0'00',
flowic_proto =0'00',
flowic_flags =0'00',
flowic_secid =0,
flowic_tun_key ={
tun_id =0
}
},
saddr =0,
daddr =0,
uli ={
ports ={
dport =0,
sport =0
},
icmpt ={
type =0'00',
code =0'00'
},
dnports ={
dport =0,
sport =0
},
spi =0,
gre_key =0,
mht ={
type =0'00'
}
}
},
ip6 ={
__fl_common ={
flowic_oif =0,
flowic_iif =0,
flowic_mark =0,
flowic_tos =0'00',
flowic_scope =0'00',
flowic_proto =0'00',
flowic_flags =0'00',
flowic_secid =0,
flowic_tun_key ={
tun_id =0
}
},
daddr ={
in6_u ={
u6_addr8 ="000000000000000000000000000000",
u6_addr16 ={0,0,0,0,0,0,0,0},
u6_addr32 ={0,0,0,0}
}
},
saddr ={
in6_u ={
u6_addr8 ="000000000000000000000000000000",
u6_addr16 ={0,0,0,0,0,0,0,0},
u6_addr32 ={0,0,0,0}
}
},
flowlabel =0,
uli ={
ports ={
dport =0,
sport =0
},
icmpt ={
type =0'00',
code =0'00'
},
dnports ={
dport =0,
sport =0
},
spi =0,
gre_key =0,
mht ={
type =0'00'
}
}
},
dn ={
__fl_common ={
flowic_oif =0,
flowic_iif =0,
flowic_mark =0,
flowic_tos =0'00',
flowic_scope =0'00',
flowic_proto =0'00',
flowic_flags =0'00',
flowic_secid =0,
flowic_tun_key ={
tun_id =0
}
},
daddr =0,
saddr =0,
uli ={
ports ={
dport =0,
sport =0
},
icmpt ={
type =0'00',
code =0'00'
},
dnports ={
dport =0,
sport =0
},
spi =0,
gre_key =0,
mht ={
type =0'00'
}
}
}
}
}
}
},
icsk_accept_queue ={
rskq_lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
},
rskq_defer_accept =0'00',
synflood_warned =0,
qlen ={
counter =0
},
young ={
counter =0
},
rskq_accept_head =0x0,
rskq_accept_tail =0x0,
fastopenq ={
rskq_rst_head =0x0,
rskq_rst_tail =0x0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
},
qlen =0,
max_qlen =0
}
},
icsk_bind_hash =0xffff88006c9909c0,
icsk_timeout =0,
icsk_retransmit_timer ={
entry ={
next =0x0,
pprev =0x0
},
expires =0,
function=0xffffffff8177e850<tcp_write_timer>,
data =18446612136721221504,
flags =2,
slack =-1,
start_pid =-1,
start_site =0x0,
start_comm ="000000000000000000000000000000"
},
icsk_delack_timer ={
entry ={
next =0x0,
pprev =0x0
},
expires =0,
function=0xffffffff8177dd10<tcp_delack_timer>,
data =18446612136721221504,
flags =2,
slack =-1,
start_pid =-1,
start_site =0x0,
start_comm ="000000000000000000000000000000"
},
icsk_rto =250,
icsk_pmtu_cookie =0,
icsk_ca_ops =0xffffffff81f3e2e0<cubictcp>,
icsk_af_ops =0xffffffff81ac1fc0<ipv4_specific>,
icsk_sync_mss =0xffffffff81778240<tcp_sync_mss>,
icsk_ca_state =0'00',
icsk_ca_setsockopt =0'00',
icsk_ca_dst_locked =0'00',
icsk_retransmits =0'00',
icsk_pending =0'00',
icsk_backoff =0'00',
icsk_syn_retries =0'00',
icsk_probes_out =0'00',
icsk_ext_hdr_len =0,
icsk_ack ={
pending =0'00',
quick =0'00',
pingpong =0'00',
blocked =0'00',
ato =0,
timeout =0,
lrcvtime =0,
last_seg_size =0,
rcv_mss =0
},
icsk_mtup ={
enabled =0,
search_high =0,
search_low =0,
probe_size =0,
probe_timestamp =0
},
icsk_user_timeout =0,
icsk_ca_priv ={0,0,0,0,0,0,0,0}
}
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来自为知笔记(Wiz)