sysfs net
/proc/net
- net/ipv4/proc.c
-
net/ipv6/proc.c
- Documentation/networking/proc_net_tcp.rst
搜索每一个字段实现的位置 proc_create_net("
这是一个超级大的目录
├── anycast6
├── arp
├── bnep
├── connector
├── dev
├── dev_mcast
├── dev_snmp6
│ ├── br-3177677df140
│ ├── br-a7c25b8e6a73
│ ├── br-c06975109cc3
│ ├── br-in
│ ├── cni0
│ ├── docker0
│ ├── enp5s0
│ ├── enp6s0
│ ├── flannel.1
│ ├── lo
│ ├── ovs-system
│ ├── tailscale0
│ ├── veth1004d86a
│ ├── veth1536e405
│ ├── veth40bec009
│ ├── veth9e2dea91
│ ├── vethe1fb6ce5
│ ├── vif12.0
│ ├── vif12.1
│ ├── vif12.2
│ ├── vif13.0
│ ├── vif13.1
│ ├── vif13.2
│ ├── vif21.0
│ ├── vif21.1
│ ├── vif21.2
│ ├── vif26.0
│ ├── vif26.1
│ ├── vif26.2
│ ├── vif27.0
│ ├── vif27.1
│ ├── vif27.2
│ ├── vif28.0
│ ├── vif28.1
│ ├── vif28.2
│ ├── vif29.0
│ ├── vif29.1
│ ├── vif29.2
│ ├── vif5.0
│ ├── vif5.1
│ ├── vif5.2
│ ├── vif9.0
│ ├── vif9.1
│ ├── vif9.2
│ └── wlo1
├── fib_trie
├── fib_triestat
├── hci
├── icmp
├── icmp6
├── if_inet6
├── igmp
├── igmp6
├── ip6_flowlabel
├── ip6_mr_cache
├── ip6_mr_vif
├── ip_mr_cache
├── ip_mr_vif
├── ip_tables_matches
├── ip_tables_names
├── ip_tables_targets
├── ipv6_route
├── l2cap
├── mcfilter
├── mcfilter6
├── netfilter
│ ├── nf_log
│ └── nfnetlink_log
├── netlink
├── netstat
├── packet
├── protocols
├── psched
├── ptype
├── raw
├── raw6
├── rfcomm
├── route
├── rpc
│ ├── auth.rpcsec.context
│ │ ├── channel
│ │ └── flush
│ ├── auth.rpcsec.init
│ │ ├── channel
│ │ └── flush
│ ├── auth.unix.gid
│ │ ├── channel
│ │ ├── content
│ │ └── flush
│ ├── auth.unix.ip
│ │ ├── channel
│ │ ├── content
│ │ └── flush
│ ├── gss_krb5_enctypes
│ ├── nfs4.idtoname
│ │ ├── channel
│ │ ├── content
│ │ └── flush
│ ├── nfs4.nametoid
│ │ ├── channel
│ │ ├── content
│ │ └── flush
│ ├── nfsd
│ ├── nfsd.export
│ │ ├── channel
│ │ ├── content
│ │ └── flush
│ ├── nfsd.fh
│ │ ├── channel
│ │ ├── content
│ │ └── flush
│ └── use-gss-proxy
├── rt6_stats
├── rt_acct
├── rt_cache
├── sco
├── snmp
├── snmp6
├── sockstat
├── sockstat6
├── softnet_stat
├── stat
│ ├── arp_cache
│ ├── ndisc_cache
│ └── rt_cache
├── tcp
├── tcp6
├── udp
├── udp6
├── udplite
├── udplite6
├── unix
└── wireless
/proc/net/dev : 统计
🧀 column -t /proc/net/dev
Inter-| Receive | Transmit
face |bytes packets errs drop fifo frame compressed multicast |bytes packets errs drop fifo colls carrier compressed
lo: 1359509820 1327480 0 0 0 0 0 0 1359509820 1327480 0 0 0 0 0 0
enp6s0: 3682998 14228 0 0 0 0 0 3614 736744 3334 0 0 0 0 0 0
enp5s0: 75513003 941577 0 0 0 0 0 27447 581828683 2765235 0 0 0 0 0 0
wlo1: 1230709118 1731240 0 0 0 0 0 0 215042305 808231 0 6 0 0 0 0
ovs-system: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
br-in: 596100352 1737488 0 0 0 0 0 0 1174354586 2669311 0 0 0 0 0 0
tailscale0: 17177731 308895 0 0 0 0 0 0 116894797 411671 0 0 0 0 0 0
br-90f636c9ff3f: 0 0 0 0 0 0 0 0 0 0 0 333 0 0 0 0
br-a7c25b8e6a73: 0 0 0 0 0 0 0 0 0 0 0 333 0 0 0 0
br-c06975109cc3: 0 0 0 0 0 0 0 0 0 0 0 331 0 0 0 0
docker0: 0 0 0 0 0 0 0 0 0 0 0 331 0 0 0 0
br-3177677df140: 0 0 0 0 0 0 0 0 0 0 0 331 0 0 0 0
vif101.2: 13632207 54632 0 0 0 0 0 0 189461386 76442 0 51 0 0 0 0
vif101.3: 749181354 2189328 0 0 0 0 0 0 639916777 1463514 0 48 0 0 0 0
vif117.2: 5834 31 0 0 0 0 0 0 544888 3365 0 92 0 0 0 0
vif117.3: 0 0 0 0 0 0 0 0 550722 3396 0 91 0 0 0 0
vif11.2: 13454 50 0 0 0 0 0 0 13947 36 0 33 0 0 0 0
vif11.3: 2555 16 0 0 0 0 0 0 6616 48 0 33 0 0 0 0
vif16.2: 0 0 0 0 0 0 0 0 10012 60 0 32 0 0 0 0
vif16.3: 0 0 0 0 0 0 0 0 10012 60 0 31 0 0 0 0
vif88.2: 0 0 0 0 0 0 0 0 2152 22 0 60 0 0 0 0
vif88.3: 4418 69 0 0 0 0 0 0 81010 498 0 60 0 0 0 0
vif80.2: 12774 137 0 0 0 0 0 0 11429 124 0 30 0 0 0 0
vif80.3: 10173 106 0 0 0 0 0 0 14030 155 0 30 0 0 0 0
/proc/net/unix
net/unix/af_unix.c : unix_seq_show
/proc/sys/net
- bridge ->
- core -> net/core/sysctl_net_core.c
- ipv4 -> net/ipv4/sysctl_net_ipv4.c
- ipv6
- mptcp -> net/mptcp/ctrl.c
- netfilter -> net/netfilter/nf_conntrack_standalone.c
- nf_conntrack_max
- unix -> net/unix/sysctl_net_unix.c
可以把 /proc/sys/net 下的所有文件都提供下
🧀 cat /proc/sys/net/core/message_burst
10
1076034/var2/log 13900k
🧀 cat /proc/sys/net/core/message_cost
5
1076034/var2/log 13900k
🤒 cat /proc/sys/net/ipv4/ip_local_port_range
32768 60999
和这个 IP_LOCAL_PORT_RANGE 是什么关系?
如果有所谓的 IANA 限制，只是分配而已，为什么代码上还需要考虑到他们？
/sys/class/net
/sys/class/net/$dev/statistics
/proc/pid/net
和 /proc/net 中的内容相同，但是是取决于 process 所在的 namespace ，我猜测实现的难度并不高
例如 unix_net_init 中，可以参考 unix_seq_ops 的执行携带参数 net 的，net 就是当时的 namespace 了
if (!proc_create_net("unix", 0, net->proc_net, &unix_seq_ops,
sizeof(struct seq_net_private)))
goto err_sysctl;
cat /sys/class/net/enp5s0/address
如何快速获取到 interface 对应的源码
通过: rg DEVICE_ATTR | grep address
- alloc_netdev : 在 /sys/class/net 创建一个文件夹出来
实现的文件的内容都在这里 : net/core/net-sysfs.c
- net/core/gen_stats.c 实现 /sys/class/net/enp7s0/statistics
不同类型的设备的结构不同
addr_assign_type carrier_changes dormant ifalias mtu owner proto_down testing uevent
addr_len carrier_down_count duplex ifindex name_assign_type phys_port_id queues threaded upper_ovs-system
address carrier_up_count flags iflink napi_defer_hard_irqs phys_port_name speed tun_flags
broadcast dev_id gro_flush_timeout link_mode netdev_group phys_switch_id statistics tx_queue_len
carrier dev_port group master operstate power subsystem type
tap
static DEVICE_ATTR_RO(tun_flags);
static DEVICE_ATTR_RO(owner);
static DEVICE_ATTR_RO(group);
static struct attribute *tun_dev_attrs[] = {
&dev_attr_tun_flags.attr,
&dev_attr_owner.attr,
&dev_attr_group.attr,
NULL
};
static const struct attribute_group tun_attr_group = {
.attrs = tun_dev_attrs
};
wg
似乎是没有额外的内容的。
/proc/$pid/net/dev
在 13900k 的物理机中:
Inter-| Receive | Transmit
face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed
lo: 45488359171 23380032 0 0 0 0 0 0 45488359171 23380032 0 0 0 0 0 0
enp5s0: 12001938009 10367664 0 0 0 0 0 210901 4255357361 5780796 0 0 0 0 0 0
wlo1: 136959341039 126634386 0 186926 0 0 0 0 24044948181 38983909 0 0 0 0 0 0
ovs-system: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
br-in: 11233358375 5109264 0 0 0 0 0 0 40134605873 3851332 0 0 0 0 0 0
tailscale0: 1427722 14051 0 0 0 0 0 0 42078882 74818 0 0 0 0 0 0
br-3177677df140: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
br-a7c25b8e6a73: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
br-c06975109cc3: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
docker0: 0 0 0 0 0 0 0 0 28211 156 0 0 0 0 0 0
vif50.2: 37193504 460048 0 0 0 0 0 0 33599674510 1067168 0 10119 0 0 0 0
vif50.3: 864968 19822 0 0 0 0 0 0 29531579 276515 0 10165 0 0 0 0
vif5.2: 1077035 9777 0 0 0 0 0 0 171396607 22809 0 0 0 0 0 0
vif5.3: 0 0 0 0 0 0 0 0 2759654 15949 0 0 0 0 0 0
vif55.2: 9271023 67999 0 0 0 0 0 0 2704004959 193348 0 1 0 0 0 0
vif55.3: 2897523 12626 0 0 0 0 0 0 14026330 87299 0 1 0 0 0 0
vif45.2: 19156 278 0 0 0 0 0 0 3796804 22299 0 3 0 0 0 0
vif45.3: 19154 277 0 0 0 0 0 0 3796786 22300 0 16 0 0 0 0
vif11.2: 17280 141 0 0 0 0 0 0 1789236 10489 0 0 0 0 0 0
vif11.3: 825921 4871 0 0 0 0 0 0 980595 5759 0 0 0 0 0 0
vif51.2: 731750 2936 0 0 0 0 0 0 3266848 23181 0 0 0 0 0 0
vif51.3: 730932 2917 0 0 0 0 0 0 3266670 23184 0 1 0 0 0 0
13900k 的容器中:
bash-5.0# cat /proc/self/net/dev
Inter-| Receive | Transmit
face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed
lo: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
eth0: 1830 15 0 0 0 0 0 0 0 0 0 0 0 0 0 0
具体代码就不看了，就是 namespace 下可以看到的 network device 吧
/proc/$pid/fd 中的 socket 可以被找到详细信息的
🧀 l
Permissions Size User Date Modified Name
lrwx------ - martins3 28 Sep 16:15 0 -> /dev/pts/6
lrwx------ - martins3 28 Sep 16:15 1 -> /dev/pts/6
lrwx------ - martins3 28 Sep 16:15 2 -> /dev/pts/6
lrwx------ - martins3 28 Sep 16:15 3 -> socket:[695550]
lrwx------ - martins3 28 Sep 16:15 4 -> anon_inode:[eventfd]
l-wx------ - martins3 28 Sep 16:15 5 -> /home/martins3/data/hack/vm/base/s/pid
lrwx------ - martins3 28 Sep 16:15 6 -> anon_inode:[signalfd]
lrwx------ - martins3 28 Sep 16:15 7 -> anon_inode:[eventfd]
lrwx------ - martins3 28 Sep 16:15 8 -> anon_inode:[eventfd]
lrwx------ - martins3 28 Sep 16:15 9 -> socket:[695551]
lrwx------ - martins3 28 Sep 16:15 10 -> socket:[695552]
lrwx------ - martins3 28 Sep 16:15 11 -> socket:[695553]
lrwx------ - martins3 28 Sep 16:15 12 -> socket:[695559]
grep -l 695559 /proc/net/{tcp,udp,tcp6,udp6,unix}
/proc/net/tcp 中内容
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