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// Copyright 2019 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package proc
import (
"bytes"
"fmt"
"io"
"reflect"
"time"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/errors/linuxerr"
"gvisor.dev/gvisor/pkg/hostarch"
"gvisor.dev/gvisor/pkg/log"
"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
"gvisor.dev/gvisor/pkg/sentry/inet"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
"gvisor.dev/gvisor/pkg/sentry/socket"
"gvisor.dev/gvisor/pkg/sentry/socket/unix"
"gvisor.dev/gvisor/pkg/sentry/socket/unix/transport"
"gvisor.dev/gvisor/pkg/sentry/vfs"
"gvisor.dev/gvisor/pkg/tcpip/header"
)
func (fs *filesystem) newTaskNetDir(ctx context.Context, task *kernel.Task) kernfs.Inode {
k := task.Kernel()
pidns := task.PIDNamespace()
root := auth.NewRootCredentials(pidns.UserNamespace())
var contents map[string]kernfs.Inode
if stack := task.NetworkNamespace().Stack(); stack != nil {
const (
arp = "IP address HW type Flags HW address Mask Device\n"
netlink = "sk Eth Pid Groups Rmem Wmem Dump Locks Drops Inode\n"
packet = "sk RefCnt Type Proto Iface R Rmem User Inode\n"
protocols = "protocol size sockets memory press maxhdr slab module cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"
ptype = "Type Device Function\n"
upd6 = " sl local_address remote_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode\n"
)
psched := fmt.Sprintf("%08x %08x %08x %08x\n", uint64(time.Microsecond/time.Nanosecond), 64, 1000000, uint64(time.Second/time.Nanosecond))
// TODO(gvisor.dev/issue/1833): Make sure file contents reflect the task
// network namespace.
contents = map[string]kernfs.Inode{
"dev": fs.newInode(ctx, root, 0444, &netDevData{stack: stack}),
"snmp": fs.newInode(ctx, root, 0444, &netSnmpData{stack: stack}),
// The following files are simple stubs until they are implemented in
// netstack, if the file contains a header the stub is just the header
// otherwise it is an empty file.
"arp": fs.newInode(ctx, root, 0444, newStaticFile(arp)),
"netlink": fs.newInode(ctx, root, 0444, newStaticFile(netlink)),
"netstat": fs.newInode(ctx, root, 0444, &netStatData{}),
"packet": fs.newInode(ctx, root, 0444, newStaticFile(packet)),
"protocols": fs.newInode(ctx, root, 0444, newStaticFile(protocols)),
// Linux sets psched values to: nsec per usec, psched tick in ns, 1000000,
// high res timer ticks per sec (ClockGetres returns 1ns resolution).
"psched": fs.newInode(ctx, root, 0444, newStaticFile(psched)),
"ptype": fs.newInode(ctx, root, 0444, newStaticFile(ptype)),
"route": fs.newInode(ctx, root, 0444, &netRouteData{stack: stack}),
"tcp": fs.newInode(ctx, root, 0444, &netTCPData{kernel: k}),
"udp": fs.newInode(ctx, root, 0444, &netUDPData{kernel: k}),
"unix": fs.newInode(ctx, root, 0444, &netUnixData{kernel: k}),
}
if stack.SupportsIPv6() {
contents["if_inet6"] = fs.newInode(ctx, root, 0444, &ifinet6{stack: stack})
contents["ipv6_route"] = fs.newInode(ctx, root, 0444, newStaticFile(""))
contents["tcp6"] = fs.newInode(ctx, root, 0444, &netTCP6Data{kernel: k})
contents["udp6"] = fs.newInode(ctx, root, 0444, newStaticFile(upd6))
}
}
return fs.newTaskOwnedDir(ctx, task, fs.NextIno(), 0555, contents)
}
// ifinet6 implements vfs.DynamicBytesSource for /proc/net/if_inet6.
//
// +stateify savable
type ifinet6 struct {
kernfs.DynamicBytesFile
stack inet.Stack
}
var _ dynamicInode = (*ifinet6)(nil)
func (n *ifinet6) contents() []string {
var lines []string
nics := n.stack.Interfaces()
for id, naddrs := range n.stack.InterfaceAddrs() {
nic, ok := nics[id]
if !ok {
// NIC was added after NICNames was called. We'll just ignore it.
continue
}
for _, a := range naddrs {
// IPv6 only.
if a.Family != linux.AF_INET6 {
continue
}
// Fields:
// IPv6 address displayed in 32 hexadecimal chars without colons
// Netlink device number (interface index) in hexadecimal (use nic id)
// Prefix length in hexadecimal
// Scope value (use 0)
// Interface flags
// Device name
lines = append(lines, fmt.Sprintf("%032x %02x %02x %02x %02x %8s\n", a.Addr, id, a.PrefixLen, 0, a.Flags, nic.Name))
}
}
return lines
}
// Generate implements vfs.DynamicBytesSource.Generate.
func (n *ifinet6) Generate(ctx context.Context, buf *bytes.Buffer) error {
for _, l := range n.contents() {
buf.WriteString(l)
}
return nil
}
// netDevData implements vfs.DynamicBytesSource for /proc/net/dev.
//
// +stateify savable
type netDevData struct {
kernfs.DynamicBytesFile
stack inet.Stack
}
var _ dynamicInode = (*netDevData)(nil)
// Generate implements vfs.DynamicBytesSource.Generate.
func (n *netDevData) Generate(ctx context.Context, buf *bytes.Buffer) error {
interfaces := n.stack.Interfaces()
buf.WriteString("Inter-| Receive | Transmit\n")
buf.WriteString(" face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed\n")
for _, i := range interfaces {
// Implements the same format as
// net/core/net-procfs.c:dev_seq_printf_stats.
var stats inet.StatDev
if err := n.stack.Statistics(&stats, i.Name); err != nil {
log.Warningf("Failed to retrieve interface statistics for %v: %v", i.Name, err)
continue
}
fmt.Fprintf(
buf,
"%6s: %7d %7d %4d %4d %4d %5d %10d %9d %8d %7d %4d %4d %4d %5d %7d %10d\n",
i.Name,
// Received
stats[0], // bytes
stats[1], // packets
stats[2], // errors
stats[3], // dropped
stats[4], // fifo
stats[5], // frame
stats[6], // compressed
stats[7], // multicast
// Transmitted
stats[8], // bytes
stats[9], // packets
stats[10], // errors
stats[11], // dropped
stats[12], // fifo
stats[13], // frame
stats[14], // compressed
stats[15], // multicast
)
}
return nil
}
// netUnixData implements vfs.DynamicBytesSource for /proc/net/unix.
//
// +stateify savable
type netUnixData struct {
kernfs.DynamicBytesFile
kernel *kernel.Kernel
}
var _ dynamicInode = (*netUnixData)(nil)
// Generate implements vfs.DynamicBytesSource.Generate.
func (n *netUnixData) Generate(ctx context.Context, buf *bytes.Buffer) error {
buf.WriteString("Num RefCount Protocol Flags Type St Inode Path\n")
for _, se := range n.kernel.ListSockets() {
s := se.Sock
if !s.TryIncRef() {
// Racing with socket destruction, this is ok.
continue
}
if family, _, _ := s.Impl().(socket.Socket).Type(); family != linux.AF_UNIX {
s.DecRef(ctx)
// Not a unix socket.
continue
}
sops := s.Impl().(*unix.Socket)
addr, err := sops.Endpoint().GetLocalAddress()
if err != nil {
log.Warningf("Failed to retrieve socket name from %+v: %v", s, err)
addr.Addr = "<unknown>"
}
sockFlags := 0
if ce, ok := sops.Endpoint().(transport.ConnectingEndpoint); ok {
ce.Lock()
if ce.ListeningLocked() {
// For unix domain sockets, linux reports a single flag
// value if the socket is listening, of __SO_ACCEPTCON.
sockFlags = linux.SO_ACCEPTCON
}
ce.Unlock()
}
// Get inode number.
var ino uint64
stat, statErr := s.Stat(ctx, vfs.StatOptions{Mask: linux.STATX_INO})
if statErr != nil || stat.Mask&linux.STATX_INO == 0 {
log.Warningf("Failed to retrieve ino for socket file: %v", statErr)
} else {
ino = stat.Ino
}
// In the socket entry below, the value for the 'Num' field requires
// some consideration. Linux prints the address to the struct
// unix_sock representing a socket in the kernel, but may redact the
// value for unprivileged users depending on the kptr_restrict
// sysctl.
//
// One use for this field is to allow a privileged user to
// introspect into the kernel memory to determine information about
// a socket not available through procfs, such as the socket's peer.
//
// In gvisor, returning a pointer to our internal structures would
// be pointless, as it wouldn't match the memory layout for struct
// unix_sock, making introspection difficult. We could populate a
// struct unix_sock with the appropriate data, but even that
// requires consideration for which kernel version to emulate, as
// the definition of this struct changes over time.
//
// For now, we always redact this pointer.
fmt.Fprintf(buf, "%#016p: %08X %08X %08X %04X %02X %8d",
(*unix.Socket)(nil), // Num, pointer to kernel socket struct.
s.ReadRefs()-1, // RefCount, don't count our own ref.
0, // Protocol, always 0 for UDS.
sockFlags, // Flags.
sops.Endpoint().Type(), // Type.
sops.State(), // State.
ino, // Inode.
)
// Path
if len(addr.Addr) != 0 {
if addr.Addr[0] == 0 {
// Abstract path.
fmt.Fprintf(buf, " @%s", string(addr.Addr[1:]))
} else {
fmt.Fprintf(buf, " %s", string(addr.Addr))
}
}
fmt.Fprintf(buf, "\n")
s.DecRef(ctx)
}
return nil
}
func networkToHost16(n uint16) uint16 {
// n is in network byte order, so is big-endian. The most-significant byte
// should be stored in the lower address.
//
// We manually inline binary.BigEndian.Uint16() because Go does not support
// non-primitive consts, so binary.BigEndian is a (mutable) var, so calls to
// binary.BigEndian.Uint16() require a read of binary.BigEndian and an
// interface method call, defeating inlining.
buf := [2]byte{byte(n >> 8 & 0xff), byte(n & 0xff)}
return hostarch.ByteOrder.Uint16(buf[:])
}
func writeInetAddr(w io.Writer, family int, i linux.SockAddr) {
switch family {
case linux.AF_INET:
var a linux.SockAddrInet
if i != nil {
a = *i.(*linux.SockAddrInet)
}
// linux.SockAddrInet.Port is stored in the network byte order and is
// printed like a number in host byte order. Note that all numbers in host
// byte order are printed with the most-significant byte first when
// formatted with %X. See get_tcp4_sock() and udp4_format_sock() in Linux.
port := networkToHost16(a.Port)
// linux.SockAddrInet.Addr is stored as a byte slice in big-endian order
// (i.e. most-significant byte in index 0). Linux represents this as a
// __be32 which is a typedef for an unsigned int, and is printed with
// %X. This means that for a little-endian machine, Linux prints the
// least-significant byte of the address first. To emulate this, we first
// invert the byte order for the address using hostarch.ByteOrder.Uint32,
// which makes it have the equivalent encoding to a __be32 on a little
// endian machine. Note that this operation is a no-op on a big endian
// machine. Then similar to Linux, we format it with %X, which will print
// the most-significant byte of the __be32 address first, which is now
// actually the least-significant byte of the original address in
// linux.SockAddrInet.Addr on little endian machines, due to the conversion.
addr := hostarch.ByteOrder.Uint32(a.Addr[:])
fmt.Fprintf(w, "%08X:%04X ", addr, port)
case linux.AF_INET6:
var a linux.SockAddrInet6
if i != nil {
a = *i.(*linux.SockAddrInet6)
}
port := networkToHost16(a.Port)
addr0 := hostarch.ByteOrder.Uint32(a.Addr[0:4])
addr1 := hostarch.ByteOrder.Uint32(a.Addr[4:8])
addr2 := hostarch.ByteOrder.Uint32(a.Addr[8:12])
addr3 := hostarch.ByteOrder.Uint32(a.Addr[12:16])
fmt.Fprintf(w, "%08X%08X%08X%08X:%04X ", addr0, addr1, addr2, addr3, port)
}
}
func commonGenerateTCP(ctx context.Context, buf *bytes.Buffer, k *kernel.Kernel, family int) error {
// t may be nil here if our caller is not part of a task goroutine. This can
// happen for example if we're here for "sentryctl cat". When t is nil,
// degrade gracefully and retrieve what we can.
t := kernel.TaskFromContext(ctx)
for _, se := range k.ListSockets() {
s := se.Sock
if !s.TryIncRef() {
// Racing with socket destruction, this is ok.
continue
}
sops, ok := s.Impl().(socket.Socket)
if !ok {
panic(fmt.Sprintf("Found non-socket file in socket table: %+v", s))
}
if fa, stype, _ := sops.Type(); !(family == fa && stype == linux.SOCK_STREAM) {
s.DecRef(ctx)
// Not tcp4 sockets.
continue
}
// Linux's documentation for the fields below can be found at
// https://www.kernel.org/doc/Documentation/networking/proc_net_tcp.txt.
// For Linux's implementation, see net/ipv4/tcp_ipv4.c:get_tcp4_sock().
// Note that the header doesn't contain labels for all the fields.
// Field: sl; entry number.
fmt.Fprintf(buf, "%4d: ", se.ID)
// Field: local_adddress.
var localAddr linux.SockAddr
if t != nil {
if local, _, err := sops.GetSockName(t); err == nil {
localAddr = local
}
}
writeInetAddr(buf, family, localAddr)
// Field: rem_address.
var remoteAddr linux.SockAddr
if t != nil {
if remote, _, err := sops.GetPeerName(t); err == nil {
remoteAddr = remote
}
}
writeInetAddr(buf, family, remoteAddr)
// Field: state; socket state.
fmt.Fprintf(buf, "%02X ", sops.State())
// Field: tx_queue, rx_queue; number of packets in the transmit and
// receive queue. Unimplemented.
fmt.Fprintf(buf, "%08X:%08X ", 0, 0)
// Field: tr, tm->when; timer active state and number of jiffies
// until timer expires. Unimplemented.
fmt.Fprintf(buf, "%02X:%08X ", 0, 0)
// Field: retrnsmt; number of unrecovered RTO timeouts.
// Unimplemented.
fmt.Fprintf(buf, "%08X ", 0)
stat, statErr := s.Stat(ctx, vfs.StatOptions{Mask: linux.STATX_UID | linux.STATX_INO})
// Field: uid.
if statErr != nil || stat.Mask&linux.STATX_UID == 0 {
log.Warningf("Failed to retrieve uid for socket file: %v", statErr)
fmt.Fprintf(buf, "%5d ", 0)
} else {
creds := auth.CredentialsFromContext(ctx)
fmt.Fprintf(buf, "%5d ", uint32(auth.KUID(stat.UID).In(creds.UserNamespace).OrOverflow()))
}
// Field: timeout; number of unanswered 0-window probes.
// Unimplemented.
fmt.Fprintf(buf, "%8d ", 0)
// Field: inode.
if statErr != nil || stat.Mask&linux.STATX_INO == 0 {
log.Warningf("Failed to retrieve inode for socket file: %v", statErr)
fmt.Fprintf(buf, "%8d ", 0)
} else {
fmt.Fprintf(buf, "%8d ", stat.Ino)
}
// Field: refcount. Don't count the ref we obtain while deferencing
// the weakref to this socket.
fmt.Fprintf(buf, "%d ", s.ReadRefs()-1)
// Field: Socket struct address. Redacted due to the same reason as
// the 'Num' field in /proc/net/unix, see netUnix.ReadSeqFileData.
fmt.Fprintf(buf, "%#016p ", (*socket.Socket)(nil))
// Field: retransmit timeout. Unimplemented.
fmt.Fprintf(buf, "%d ", 0)
// Field: predicted tick of soft clock (delayed ACK control data).
// Unimplemented.
fmt.Fprintf(buf, "%d ", 0)
// Field: (ack.quick<<1)|ack.pingpong, Unimplemented.
fmt.Fprintf(buf, "%d ", 0)
// Field: sending congestion window, Unimplemented.
fmt.Fprintf(buf, "%d ", 0)
// Field: Slow start size threshold, -1 if threshold >= 0xFFFF.
// Unimplemented, report as large threshold.
fmt.Fprintf(buf, "%d", -1)
fmt.Fprintf(buf, "\n")
s.DecRef(ctx)
}
return nil
}
// netTCPData implements vfs.DynamicBytesSource for /proc/net/tcp.
//
// +stateify savable
type netTCPData struct {
kernfs.DynamicBytesFile
kernel *kernel.Kernel
}
var _ dynamicInode = (*netTCPData)(nil)
func (d *netTCPData) Generate(ctx context.Context, buf *bytes.Buffer) error {
buf.WriteString(" sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode \n")
return commonGenerateTCP(ctx, buf, d.kernel, linux.AF_INET)
}
// netTCP6Data implements vfs.DynamicBytesSource for /proc/net/tcp6.
//
// +stateify savable
type netTCP6Data struct {
kernfs.DynamicBytesFile
kernel *kernel.Kernel
}
var _ dynamicInode = (*netTCP6Data)(nil)
func (d *netTCP6Data) Generate(ctx context.Context, buf *bytes.Buffer) error {
buf.WriteString(" sl local_address remote_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode\n")
return commonGenerateTCP(ctx, buf, d.kernel, linux.AF_INET6)
}
// netUDPData implements vfs.DynamicBytesSource for /proc/net/udp.
//
// +stateify savable
type netUDPData struct {
kernfs.DynamicBytesFile
kernel *kernel.Kernel
}
var _ dynamicInode = (*netUDPData)(nil)
// Generate implements vfs.DynamicBytesSource.Generate.
func (d *netUDPData) Generate(ctx context.Context, buf *bytes.Buffer) error {
// t may be nil here if our caller is not part of a task goroutine. This can
// happen for example if we're here for "sentryctl cat". When t is nil,
// degrade gracefully and retrieve what we can.
t := kernel.TaskFromContext(ctx)
buf.WriteString(" sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode ref pointer drops \n")
for _, se := range d.kernel.ListSockets() {
s := se.Sock
if !s.TryIncRef() {
// Racing with socket destruction, this is ok.
continue
}
sops, ok := s.Impl().(socket.Socket)
if !ok {
panic(fmt.Sprintf("Found non-socket file in socket table: %+v", s))
}
if family, stype, _ := sops.Type(); family != linux.AF_INET || stype != linux.SOCK_DGRAM {
s.DecRef(ctx)
// Not udp4 socket.
continue
}
// For Linux's implementation, see net/ipv4/udp.c:udp4_format_sock().
// Field: sl; entry number.
fmt.Fprintf(buf, "%5d: ", se.ID)
// Field: local_adddress.
var localAddr linux.SockAddrInet
if t != nil {
if local, _, err := sops.GetSockName(t); err == nil {
localAddr = *local.(*linux.SockAddrInet)
}
}
writeInetAddr(buf, linux.AF_INET, &localAddr)
// Field: rem_address.
var remoteAddr linux.SockAddrInet
if t != nil {
if remote, _, err := sops.GetPeerName(t); err == nil {
remoteAddr = *remote.(*linux.SockAddrInet)
}
}
writeInetAddr(buf, linux.AF_INET, &remoteAddr)
// Field: state; socket state.
fmt.Fprintf(buf, "%02X ", sops.State())
// Field: tx_queue, rx_queue; number of packets in the transmit and
// receive queue. Unimplemented.
fmt.Fprintf(buf, "%08X:%08X ", 0, 0)
// Field: tr, tm->when. Always 0 for UDP.
fmt.Fprintf(buf, "%02X:%08X ", 0, 0)
// Field: retrnsmt. Always 0 for UDP.
fmt.Fprintf(buf, "%08X ", 0)
stat, statErr := s.Stat(ctx, vfs.StatOptions{Mask: linux.STATX_UID | linux.STATX_INO})
// Field: uid.
if statErr != nil || stat.Mask&linux.STATX_UID == 0 {
log.Warningf("Failed to retrieve uid for socket file: %v", statErr)
fmt.Fprintf(buf, "%5d ", 0)
} else {
creds := auth.CredentialsFromContext(ctx)
fmt.Fprintf(buf, "%5d ", uint32(auth.KUID(stat.UID).In(creds.UserNamespace).OrOverflow()))
}
// Field: timeout. Always 0 for UDP.
fmt.Fprintf(buf, "%8d ", 0)
// Field: inode.
if statErr != nil || stat.Mask&linux.STATX_INO == 0 {
log.Warningf("Failed to retrieve inode for socket file: %v", statErr)
fmt.Fprintf(buf, "%8d ", 0)
} else {
fmt.Fprintf(buf, "%8d ", stat.Ino)
}
// Field: ref; reference count on the socket inode. Don't count the ref
// we obtain while deferencing the weakref to this socket.
fmt.Fprintf(buf, "%d ", s.ReadRefs()-1)
// Field: Socket struct address. Redacted due to the same reason as
// the 'Num' field in /proc/net/unix, see netUnix.ReadSeqFileData.
fmt.Fprintf(buf, "%#016p ", (*socket.Socket)(nil))
// Field: drops; number of dropped packets. Unimplemented.
fmt.Fprintf(buf, "%d", 0)
fmt.Fprintf(buf, "\n")
s.DecRef(ctx)
}
return nil
}
// netSnmpData implements vfs.DynamicBytesSource for /proc/net/snmp.
//
// +stateify savable
type netSnmpData struct {
kernfs.DynamicBytesFile
stack inet.Stack
}
var _ dynamicInode = (*netSnmpData)(nil)
// +stateify savable
type snmpLine struct {
prefix string
header string
}
var snmp = []snmpLine{
{
prefix: "Ip",
header: "Forwarding DefaultTTL InReceives InHdrErrors InAddrErrors ForwDatagrams InUnknownProtos InDiscards InDelivers OutRequests OutDiscards OutNoRoutes ReasmTimeout ReasmReqds ReasmOKs ReasmFails FragOKs FragFails FragCreates",
},
{
prefix: "Icmp",
header: "InMsgs InErrors InCsumErrors InDestUnreachs InTimeExcds InParmProbs InSrcQuenchs InRedirects InEchos InEchoReps InTimestamps InTimestampReps InAddrMasks InAddrMaskReps OutMsgs OutErrors OutDestUnreachs OutTimeExcds OutParmProbs OutSrcQuenchs OutRedirects OutEchos OutEchoReps OutTimestamps OutTimestampReps OutAddrMasks OutAddrMaskReps",
},
{
prefix: "IcmpMsg",
},
{
prefix: "Tcp",
header: "RtoAlgorithm RtoMin RtoMax MaxConn ActiveOpens PassiveOpens AttemptFails EstabResets CurrEstab InSegs OutSegs RetransSegs InErrs OutRsts InCsumErrors",
},
{
prefix: "Udp",
header: "InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrors InCsumErrors IgnoredMulti",
},
{
prefix: "UdpLite",
header: "InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrors InCsumErrors IgnoredMulti",
},
}
func toSlice(a any) []uint64 {
v := reflect.Indirect(reflect.ValueOf(a))
return v.Slice(0, v.Len()).Interface().([]uint64)
}
func sprintSlice(s []uint64) string {
if len(s) == 0 {
return ""
}
r := fmt.Sprint(s)
return r[1 : len(r)-1] // Remove "[]" introduced by fmt of slice.
}
// Generate implements vfs.DynamicBytesSource.Generate.
func (d *netSnmpData) Generate(ctx context.Context, buf *bytes.Buffer) error {
types := []any{
&inet.StatSNMPIP{},
&inet.StatSNMPICMP{},
nil, // TODO(gvisor.dev/issue/628): Support IcmpMsg stats.
&inet.StatSNMPTCP{},
&inet.StatSNMPUDP{},
&inet.StatSNMPUDPLite{},
}
for i, stat := range types {
line := snmp[i]
if stat == nil {
fmt.Fprintf(buf, "%s:\n", line.prefix)
fmt.Fprintf(buf, "%s:\n", line.prefix)
continue
}
if err := d.stack.Statistics(stat, line.prefix); err != nil {
if linuxerr.Equals(linuxerr.EOPNOTSUPP, err) {
log.Infof("Failed to retrieve %s of /proc/net/snmp: %v", line.prefix, err)
} else {
log.Warningf("Failed to retrieve %s of /proc/net/snmp: %v", line.prefix, err)
}
}
fmt.Fprintf(buf, "%s: %s\n", line.prefix, line.header)
if line.prefix == "Tcp" {
tcp := stat.(*inet.StatSNMPTCP)
// "Tcp" needs special processing because MaxConn is signed. RFC 2012.
fmt.Fprintf(buf, "%s: %s %d %s\n", line.prefix, sprintSlice(tcp[:3]), int64(tcp[3]), sprintSlice(tcp[4:]))
} else {
fmt.Fprintf(buf, "%s: %s\n", line.prefix, sprintSlice(toSlice(stat)))
}
}
return nil
}
// netRouteData implements vfs.DynamicBytesSource for /proc/net/route.
//
// +stateify savable
type netRouteData struct {
kernfs.DynamicBytesFile
stack inet.Stack
}
var _ dynamicInode = (*netRouteData)(nil)
// Generate implements vfs.DynamicBytesSource.Generate.
// See Linux's net/ipv4/fib_trie.c:fib_route_seq_show.
func (d *netRouteData) Generate(ctx context.Context, buf *bytes.Buffer) error {
fmt.Fprintf(buf, "%-127s\n", "Iface\tDestination\tGateway\tFlags\tRefCnt\tUse\tMetric\tMask\tMTU\tWindow\tIRTT")
interfaces := d.stack.Interfaces()
for _, rt := range d.stack.RouteTable() {
// /proc/net/route only includes ipv4 routes.
if rt.Family != linux.AF_INET {
continue
}
// /proc/net/route does not include broadcast or multicast routes.
if rt.Type == linux.RTN_BROADCAST || rt.Type == linux.RTN_MULTICAST {
continue
}
iface, ok := interfaces[rt.OutputInterface]
if !ok || iface.Name == "lo" {
continue
}
var (
gw uint32
prefix uint32
flags = linux.RTF_UP
)
if len(rt.GatewayAddr) == header.IPv4AddressSize {
flags |= linux.RTF_GATEWAY
gw = hostarch.ByteOrder.Uint32(rt.GatewayAddr)
}
if len(rt.DstAddr) == header.IPv4AddressSize {
prefix = hostarch.ByteOrder.Uint32(rt.DstAddr)
}
l := fmt.Sprintf(
"%s\t%08X\t%08X\t%04X\t%d\t%d\t%d\t%08X\t%d\t%d\t%d",
iface.Name,
prefix,
gw,
flags,
0, // RefCnt.
0, // Use.
0, // Metric.
(uint32(1)<<rt.DstLen)-1,
0, // MTU.
0, // Window.
0, // RTT.
)
fmt.Fprintf(buf, "%-127s\n", l)
}
return nil
}
// netStatData implements vfs.DynamicBytesSource for /proc/net/netstat.
//
// +stateify savable
type netStatData struct {
kernfs.DynamicBytesFile
stack inet.Stack
}
var _ dynamicInode = (*netStatData)(nil)
// Generate implements vfs.DynamicBytesSource.Generate.
// See Linux's net/ipv4/fib_trie.c:fib_route_seq_show.
func (d *netStatData) Generate(ctx context.Context, buf *bytes.Buffer) error {
buf.WriteString("TcpExt: SyncookiesSent SyncookiesRecv SyncookiesFailed " +
"EmbryonicRsts PruneCalled RcvPruned OfoPruned OutOfWindowIcmps " +
"LockDroppedIcmps ArpFilter TW TWRecycled TWKilled PAWSPassive " +
"PAWSActive PAWSEstab DelayedACKs DelayedACKLocked DelayedACKLost " +
"ListenOverflows ListenDrops TCPPrequeued TCPDirectCopyFromBacklog " +
"TCPDirectCopyFromPrequeue TCPPrequeueDropped TCPHPHits TCPHPHitsToUser " +
"TCPPureAcks TCPHPAcks TCPRenoRecovery TCPSackRecovery TCPSACKReneging " +
"TCPFACKReorder TCPSACKReorder TCPRenoReorder TCPTSReorder TCPFullUndo " +
"TCPPartialUndo TCPDSACKUndo TCPLossUndo TCPLostRetransmit " +
"TCPRenoFailures TCPSackFailures TCPLossFailures TCPFastRetrans " +
"TCPForwardRetrans TCPSlowStartRetrans TCPTimeouts TCPLossProbes " +
"TCPLossProbeRecovery TCPRenoRecoveryFail TCPSackRecoveryFail " +
"TCPSchedulerFailed TCPRcvCollapsed TCPDSACKOldSent TCPDSACKOfoSent " +
"TCPDSACKRecv TCPDSACKOfoRecv TCPAbortOnData TCPAbortOnClose " +
"TCPAbortOnMemory TCPAbortOnTimeout TCPAbortOnLinger TCPAbortFailed " +
"TCPMemoryPressures TCPSACKDiscard TCPDSACKIgnoredOld " +
"TCPDSACKIgnoredNoUndo TCPSpuriousRTOs TCPMD5NotFound TCPMD5Unexpected " +
"TCPMD5Failure TCPSackShifted TCPSackMerged TCPSackShiftFallback " +
"TCPBacklogDrop TCPMinTTLDrop TCPDeferAcceptDrop IPReversePathFilter " +
"TCPTimeWaitOverflow TCPReqQFullDoCookies TCPReqQFullDrop TCPRetransFail " +
"TCPRcvCoalesce TCPOFOQueue TCPOFODrop TCPOFOMerge TCPChallengeACK " +
"TCPSYNChallenge TCPFastOpenActive TCPFastOpenActiveFail " +
"TCPFastOpenPassive TCPFastOpenPassiveFail TCPFastOpenListenOverflow " +
"TCPFastOpenCookieReqd TCPSpuriousRtxHostQueues BusyPollRxPackets " +
"TCPAutoCorking TCPFromZeroWindowAdv TCPToZeroWindowAdv " +
"TCPWantZeroWindowAdv TCPSynRetrans TCPOrigDataSent TCPHystartTrainDetect " +
"TCPHystartTrainCwnd TCPHystartDelayDetect TCPHystartDelayCwnd " +
"TCPACKSkippedSynRecv TCPACKSkippedPAWS TCPACKSkippedSeq " +
"TCPACKSkippedFinWait2 TCPACKSkippedTimeWait TCPACKSkippedChallenge " +
"TCPWinProbe TCPKeepAlive TCPMTUPFail TCPMTUPSuccess\n")
return nil
}
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