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Diffstat (limited to 'pkg/sentry/fs/proc/rpcinet_proc.go')
-rw-r--r--pkg/sentry/fs/proc/rpcinet_proc.go217
1 files changed, 217 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..e36c0bfa6
--- /dev/null
+++ b/pkg/sentry/fs/proc/rpcinet_proc.go
@@ -0,0 +1,217 @@
+// 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.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/fsutil"
+ "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"
+ "gvisor.googlesource.com/gvisor/pkg/syserror"
+ "gvisor.googlesource.com/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)
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-04-04 15:33:49 +0000