diff options
Diffstat (limited to 'pkg/sentry/fs/proc/rpcinet_proc.go')
| -rw-r--r-- | pkg/sentry/fs/proc/rpcinet_proc.go | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/pkg/sentry/fs/proc/rpcinet_proc.go b/pkg/sentry/fs/proc/rpcinet_proc.go new file mode 100644 index 000000000..50d0271f9 --- /dev/null +++ b/pkg/sentry/fs/proc/rpcinet_proc.go @@ -0,0 +1,193 @@ +// Copyright 2018 Google Inc. +// +// 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.googlesource.com/gvisor/pkg/abi/linux" + "gvisor.googlesource.com/gvisor/pkg/sentry/context" + "gvisor.googlesource.com/gvisor/pkg/sentry/fs" + "gvisor.googlesource.com/gvisor/pkg/sentry/fs/ramfs" + "gvisor.googlesource.com/gvisor/pkg/sentry/kernel" + "gvisor.googlesource.com/gvisor/pkg/sentry/socket/rpcinet" + "gvisor.googlesource.com/gvisor/pkg/sentry/usermem" +) + +// rpcinetFile implments fs.InodeOperations as RPCs. +type rpcinetFile struct { + ramfs.Entry + + // filepath is the full path of this rpcinetFile. + filepath string + + k *kernel.Kernel +} + +// DeprecatedPreadv implements fs.InodeOperations.DeprecatedPreadv. +// This method can panic if an rpcinetFile was created without an rpcinet +// stack. +func (r rpcinetFile) DeprecatedPreadv(ctx context.Context, dst usermem.IOSequence, offset int64) (int64, error) { + s, ok := r.k.NetworkStack().(*rpcinet.Stack) + if !ok { + panic("Network stack is not a rpcinet.") + } + + contents, se := s.RPCReadFile(r.filepath) + if se != nil || offset >= int64(len(contents)) { + return 0, io.EOF + } + + n, err := dst.CopyOut(ctx, contents[offset:]) + return int64(n), err +} + +// Truncate implements fs.InodeOperations.Truncate. +func (r rpcinetFile) Truncate(context.Context, *fs.Inode, int64) error { + return nil +} + +// DeprecatedPwritev implements fs.InodeOperations.DeprecatedPwritev. +// This method can panic if an rpcinetFile was created without an rpcinet +// stack. +func (r rpcinetFile) DeprecatedPwritev(ctx context.Context, src usermem.IOSequence, offset int64) (int64, error) { + s, ok := r.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(r.filepath, b) + return int64(written), se.ToError() +} + +func newRPCProcFSFile(ctx context.Context, msrc *fs.MountSource, filepath string, mode linux.FileMode) *fs.Inode { + f := &rpcinetFile{ + filepath: filepath, + k: kernel.KernelFromContext(ctx), + } + f.InitEntry(ctx, fs.RootOwner, fs.FilePermsFromMode(mode)) + + fi := newFile(f, msrc, fs.SpecialFile, nil) + return fi +} + +// newRPCInetProcNet will build an inode for /proc/net. +func newRPCInetProcNet(ctx context.Context, msrc *fs.MountSource) *fs.Inode { + d := &ramfs.Dir{} + d.InitDir(ctx, nil, fs.RootOwner, fs.FilePermsFromMode(0555)) + + // Add all the files we want to forward for /proc/net. + d.AddChild(ctx, "arp", newRPCProcFSFile(ctx, msrc, "/proc/net/arp", 0444)) + d.AddChild(ctx, "dev", newRPCProcFSFile(ctx, msrc, "/proc/net/dev", 0444)) + d.AddChild(ctx, "if_inet6", newRPCProcFSFile(ctx, msrc, "/proc/net/if_inet6", 0444)) + d.AddChild(ctx, "ipv6_route", newRPCProcFSFile(ctx, msrc, "/proc/net/ipv6_route", 0444)) + d.AddChild(ctx, "netlink", newRPCProcFSFile(ctx, msrc, "/proc/net/netlink", 0444)) + d.AddChild(ctx, "netstat", newRPCProcFSFile(ctx, msrc, "/proc/net/netstat", 0444)) + d.AddChild(ctx, "packet", newRPCProcFSFile(ctx, msrc, "/proc/net/packet", 0444)) + d.AddChild(ctx, "protocols", newRPCProcFSFile(ctx, msrc, "/proc/net/protocols", 0444)) + d.AddChild(ctx, "psched", newRPCProcFSFile(ctx, msrc, "/proc/net/psched", 0444)) + d.AddChild(ctx, "ptype", newRPCProcFSFile(ctx, msrc, "/proc/net/ptype", 0444)) + d.AddChild(ctx, "route", newRPCProcFSFile(ctx, msrc, "/proc/net/route", 0444)) + d.AddChild(ctx, "tcp", newRPCProcFSFile(ctx, msrc, "/proc/net/tcp", 0444)) + d.AddChild(ctx, "tcp6", newRPCProcFSFile(ctx, msrc, "/proc/net/tcp6", 0444)) + d.AddChild(ctx, "udp", newRPCProcFSFile(ctx, msrc, "/proc/net/udp", 0444)) + d.AddChild(ctx, "udp6", newRPCProcFSFile(ctx, msrc, "/proc/net/udp6", 0444)) + + return newFile(d, msrc, fs.SpecialDirectory, nil) +} + +// newRPCInetProcSysNet will build an inode for /proc/sys/net. +func newRPCInetProcSysNet(ctx context.Context, msrc *fs.MountSource) *fs.Inode { + d := &ramfs.Dir{} + d.InitDir(ctx, nil, fs.RootOwner, fs.FilePermsFromMode(0555)) + d.AddChild(ctx, "ipv4", newRPCInetSysNetIPv4Dir(ctx, msrc)) + d.AddChild(ctx, "core", newRPCInetSysNetCore(ctx, msrc)) + + return newFile(d, msrc, fs.SpecialDirectory, nil) +} + +// newRPCInetSysNetCore builds the /proc/sys/net/core directory. +func newRPCInetSysNetCore(ctx context.Context, msrc *fs.MountSource) *fs.Inode { + d := &ramfs.Dir{} + d.InitDir(ctx, nil, fs.RootOwner, fs.FilePermsFromMode(0555)) + + // Add all the files we want to forward over RPC for /proc/sys/net/core + d.AddChild(ctx, "default_qdisc", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/core/default_qdisc", 0444)) + d.AddChild(ctx, "message_burst", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/core/message_burst", 0444)) + d.AddChild(ctx, "message_cost", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/core/message_cost", 0444)) + d.AddChild(ctx, "optmem_max", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/core/optmem_max", 0444)) + d.AddChild(ctx, "rmem_default", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/core/rmem_default", 0444)) + d.AddChild(ctx, "rmem_max", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/core/rmem_max", 0444)) + d.AddChild(ctx, "somaxconn", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/core/somaxconn", 0444)) + d.AddChild(ctx, "wmem_default", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/core/wmem_default", 0444)) + d.AddChild(ctx, "wmem_max", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/core/wmem_max", 0444)) + + return newFile(d, msrc, fs.SpecialDirectory, nil) +} + +// newRPCInetSysNetIPv4Dir builds the /proc/sys/net/ipv4 directory. +func newRPCInetSysNetIPv4Dir(ctx context.Context, msrc *fs.MountSource) *fs.Inode { + d := &ramfs.Dir{} + d.InitDir(ctx, nil, fs.RootOwner, fs.FilePermsFromMode(0555)) + + // Add all the files we want to forward over RPC for /proc/sys/net/ipv4. + d.AddChild(ctx, "ip_local_port_range", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/ip_local_port_range", 0444)) + d.AddChild(ctx, "ip_local_reserved_ports", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/ip_local_reserved_ports", 0444)) + d.AddChild(ctx, "ipfrag_time", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/ipfrag_time", 0444)) + d.AddChild(ctx, "ip_nonlocal_bind", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/ip_nonlocal_bind", 0444)) + d.AddChild(ctx, "ip_no_pmtu_disc", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/ip_no_pmtu_disc", 0444)) + + d.AddChild(ctx, "tcp_allowed_congestion_control", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_allowed_congestion_control", 0444)) + d.AddChild(ctx, "tcp_available_congestion_control", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_available_congestion_control", 0444)) + d.AddChild(ctx, "tcp_base_mss", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_base_mss", 0444)) + d.AddChild(ctx, "tcp_congestion_control", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_congestion_control", 0644)) + d.AddChild(ctx, "tcp_dsack", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_dsack", 0644)) + d.AddChild(ctx, "tcp_early_retrans", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_early_retrans", 0644)) + d.AddChild(ctx, "tcp_fack", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_fack", 0644)) + d.AddChild(ctx, "tcp_fastopen", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_fastopen", 0644)) + d.AddChild(ctx, "tcp_fastopen_key", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_fastopen_key", 0444)) + d.AddChild(ctx, "tcp_fin_timeout", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_fin_timeout", 0644)) + d.AddChild(ctx, "tcp_invalid_ratelimit", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_invalid_ratelimit", 0444)) + d.AddChild(ctx, "tcp_keepalive_intvl", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_keepalive_intvl", 0644)) + d.AddChild(ctx, "tcp_keepalive_probes", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_keepalive_probes", 0644)) + d.AddChild(ctx, "tcp_keepalive_time", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_keepalive_time", 0644)) + d.AddChild(ctx, "tcp_mem", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_mem", 0444)) + d.AddChild(ctx, "tcp_mtu_probing", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_mtu_probing", 0644)) + d.AddChild(ctx, "tcp_no_metrics_save", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_no_metrics_save", 0444)) + d.AddChild(ctx, "tcp_probe_interval", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_probe_interval", 0444)) + d.AddChild(ctx, "tcp_probe_threshold", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_probe_threshold", 0444)) + d.AddChild(ctx, "tcp_retries1", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_retries1", 0644)) + d.AddChild(ctx, "tcp_retries2", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_retries2", 0644)) + d.AddChild(ctx, "tcp_rfc1337", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_rfc1337", 0444)) + d.AddChild(ctx, "tcp_rmem", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_rmem", 0444)) + d.AddChild(ctx, "tcp_sack", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_sack", 0644)) + d.AddChild(ctx, "tcp_slow_start_after_idle", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_slow_start_after_idle", 0644)) + d.AddChild(ctx, "tcp_synack_retries", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_synack_retries", 0644)) + d.AddChild(ctx, "tcp_syn_retries", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_syn_retries", 0644)) + d.AddChild(ctx, "tcp_timestamps", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_timestamps", 0644)) + d.AddChild(ctx, "tcp_wmem", newRPCProcFSFile(ctx, msrc, "/proc/sys/net/ipv4/tcp_wmem", 0444)) + + return newFile(d, msrc, fs.SpecialDirectory, nil) +} |