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// Copyright 2018 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 (
"io"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/context"
"gvisor.dev/gvisor/pkg/sentry/fs"
"gvisor.dev/gvisor/pkg/sentry/fs/fsutil"
"gvisor.dev/gvisor/pkg/sentry/fs/ramfs"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/socket/rpcinet"
"gvisor.dev/gvisor/pkg/sentry/usermem"
"gvisor.dev/gvisor/pkg/syserror"
"gvisor.dev/gvisor/pkg/waiter"
)
// rpcInetInode implments fs.InodeOperations.
type rpcInetInode struct {
fsutil.SimpleFileInode
// filepath is the full path of this rpcInetInode.
filepath string
k *kernel.Kernel
}
func newRPCInetInode(ctx context.Context, msrc *fs.MountSource, filepath string, mode linux.FileMode) *fs.Inode {
f := &rpcInetInode{
SimpleFileInode: *fsutil.NewSimpleFileInode(ctx, fs.RootOwner, fs.FilePermsFromMode(mode), linux.PROC_SUPER_MAGIC),
filepath: filepath,
k: kernel.KernelFromContext(ctx),
}
return newProcInode(f, msrc, fs.SpecialFile, nil)
}
// GetFile implements fs.InodeOperations.GetFile.
func (i *rpcInetInode) GetFile(ctx context.Context, dirent *fs.Dirent, flags fs.FileFlags) (*fs.File, error) {
flags.Pread = true
flags.Pwrite = true
fops := &rpcInetFile{
inode: i,
}
return fs.NewFile(ctx, dirent, flags, fops), nil
}
// rpcInetFile implements fs.FileOperations as RPCs.
type rpcInetFile struct {
fsutil.FileGenericSeek `state:"nosave"`
fsutil.FileNoIoctl `state:"nosave"`
fsutil.FileNoMMap `state:"nosave"`
fsutil.FileNoSplice `state:"nosave"`
fsutil.FileNoopFlush `state:"nosave"`
fsutil.FileNoopFsync `state:"nosave"`
fsutil.FileNoopRelease `state:"nosave"`
fsutil.FileNotDirReaddir `state:"nosave"`
fsutil.FileUseInodeUnstableAttr `state:"nosave"`
waiter.AlwaysReady `state:"nosave"`
inode *rpcInetInode
}
// Read implements fs.FileOperations.Read.
//
// This method can panic if an rpcInetInode was created without an rpcinet
// stack.
func (f *rpcInetFile) Read(ctx context.Context, file *fs.File, dst usermem.IOSequence, offset int64) (int64, error) {
if offset < 0 {
return 0, syserror.EINVAL
}
s, ok := f.inode.k.NetworkStack().(*rpcinet.Stack)
if !ok {
panic("Network stack is not a rpcinet.")
}
contents, se := s.RPCReadFile(f.inode.filepath)
if se != nil || offset >= int64(len(contents)) {
return 0, io.EOF
}
n, err := dst.CopyOut(ctx, contents[offset:])
return int64(n), err
}
// Write implements fs.FileOperations.Write.
//
// This method can panic if an rpcInetInode was created without an rpcInet
// stack.
func (f *rpcInetFile) Write(ctx context.Context, file *fs.File, src usermem.IOSequence, offset int64) (int64, error) {
s, ok := f.inode.k.NetworkStack().(*rpcinet.Stack)
if !ok {
panic("Network stack is not a rpcinet.")
}
if src.NumBytes() == 0 {
return 0, nil
}
b := make([]byte, src.NumBytes(), src.NumBytes())
n, err := src.CopyIn(ctx, b)
if err != nil {
return int64(n), err
}
written, se := s.RPCWriteFile(f.inode.filepath, b)
return int64(written), se.ToError()
}
// newRPCInetProcNet will build an inode for /proc/net.
func newRPCInetProcNet(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
contents := map[string]*fs.Inode{
"arp": newRPCInetInode(ctx, msrc, "/proc/net/arp", 0444),
"dev": newRPCInetInode(ctx, msrc, "/proc/net/dev", 0444),
"if_inet6": newRPCInetInode(ctx, msrc, "/proc/net/if_inet6", 0444),
"ipv6_route": newRPCInetInode(ctx, msrc, "/proc/net/ipv6_route", 0444),
"netlink": newRPCInetInode(ctx, msrc, "/proc/net/netlink", 0444),
"netstat": newRPCInetInode(ctx, msrc, "/proc/net/netstat", 0444),
"packet": newRPCInetInode(ctx, msrc, "/proc/net/packet", 0444),
"protocols": newRPCInetInode(ctx, msrc, "/proc/net/protocols", 0444),
"psched": newRPCInetInode(ctx, msrc, "/proc/net/psched", 0444),
"ptype": newRPCInetInode(ctx, msrc, "/proc/net/ptype", 0444),
"route": newRPCInetInode(ctx, msrc, "/proc/net/route", 0444),
"tcp": newRPCInetInode(ctx, msrc, "/proc/net/tcp", 0444),
"tcp6": newRPCInetInode(ctx, msrc, "/proc/net/tcp6", 0444),
"udp": newRPCInetInode(ctx, msrc, "/proc/net/udp", 0444),
"udp6": newRPCInetInode(ctx, msrc, "/proc/net/udp6", 0444),
}
d := ramfs.NewDir(ctx, contents, fs.RootOwner, fs.FilePermsFromMode(0555))
return newProcInode(d, msrc, fs.SpecialDirectory, nil)
}
// newRPCInetProcSysNet will build an inode for /proc/sys/net.
func newRPCInetProcSysNet(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
contents := map[string]*fs.Inode{
"ipv4": newRPCInetSysNetIPv4Dir(ctx, msrc),
"core": newRPCInetSysNetCore(ctx, msrc),
}
d := ramfs.NewDir(ctx, contents, fs.RootOwner, fs.FilePermsFromMode(0555))
return newProcInode(d, msrc, fs.SpecialDirectory, nil)
}
// newRPCInetSysNetCore builds the /proc/sys/net/core directory.
func newRPCInetSysNetCore(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
contents := map[string]*fs.Inode{
"default_qdisc": newRPCInetInode(ctx, msrc, "/proc/sys/net/core/default_qdisc", 0444),
"message_burst": newRPCInetInode(ctx, msrc, "/proc/sys/net/core/message_burst", 0444),
"message_cost": newRPCInetInode(ctx, msrc, "/proc/sys/net/core/message_cost", 0444),
"optmem_max": newRPCInetInode(ctx, msrc, "/proc/sys/net/core/optmem_max", 0444),
"rmem_default": newRPCInetInode(ctx, msrc, "/proc/sys/net/core/rmem_default", 0444),
"rmem_max": newRPCInetInode(ctx, msrc, "/proc/sys/net/core/rmem_max", 0444),
"somaxconn": newRPCInetInode(ctx, msrc, "/proc/sys/net/core/somaxconn", 0444),
"wmem_default": newRPCInetInode(ctx, msrc, "/proc/sys/net/core/wmem_default", 0444),
"wmem_max": newRPCInetInode(ctx, msrc, "/proc/sys/net/core/wmem_max", 0444),
}
d := ramfs.NewDir(ctx, contents, fs.RootOwner, fs.FilePermsFromMode(0555))
return newProcInode(d, msrc, fs.SpecialDirectory, nil)
}
// newRPCInetSysNetIPv4Dir builds the /proc/sys/net/ipv4 directory.
func newRPCInetSysNetIPv4Dir(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
contents := map[string]*fs.Inode{
"ip_local_port_range": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/ip_local_port_range", 0444),
"ip_local_reserved_ports": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/ip_local_reserved_ports", 0444),
"ipfrag_time": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/ipfrag_time", 0444),
"ip_nonlocal_bind": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/ip_nonlocal_bind", 0444),
"ip_no_pmtu_disc": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/ip_no_pmtu_disc", 0444),
"tcp_allowed_congestion_control": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_allowed_congestion_control", 0444),
"tcp_available_congestion_control": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_available_congestion_control", 0444),
"tcp_base_mss": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_base_mss", 0444),
"tcp_congestion_control": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_congestion_control", 0644),
"tcp_dsack": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_dsack", 0644),
"tcp_early_retrans": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_early_retrans", 0644),
"tcp_fack": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_fack", 0644),
"tcp_fastopen": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_fastopen", 0644),
"tcp_fastopen_key": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_fastopen_key", 0444),
"tcp_fin_timeout": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_fin_timeout", 0644),
"tcp_invalid_ratelimit": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_invalid_ratelimit", 0444),
"tcp_keepalive_intvl": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_keepalive_intvl", 0644),
"tcp_keepalive_probes": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_keepalive_probes", 0644),
"tcp_keepalive_time": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_keepalive_time", 0644),
"tcp_mem": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_mem", 0444),
"tcp_mtu_probing": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_mtu_probing", 0644),
"tcp_no_metrics_save": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_no_metrics_save", 0444),
"tcp_probe_interval": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_probe_interval", 0444),
"tcp_probe_threshold": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_probe_threshold", 0444),
"tcp_retries1": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_retries1", 0644),
"tcp_retries2": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_retries2", 0644),
"tcp_rfc1337": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_rfc1337", 0444),
"tcp_rmem": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_rmem", 0444),
"tcp_sack": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_sack", 0644),
"tcp_slow_start_after_idle": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_slow_start_after_idle", 0644),
"tcp_synack_retries": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_synack_retries", 0644),
"tcp_syn_retries": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_syn_retries", 0644),
"tcp_timestamps": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_timestamps", 0644),
"tcp_wmem": newRPCInetInode(ctx, msrc, "/proc/sys/net/ipv4/tcp_wmem", 0444),
}
d := ramfs.NewDir(ctx, contents, fs.RootOwner, fs.FilePermsFromMode(0555))
return newProcInode(d, msrc, fs.SpecialDirectory, nil)
}
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