Make netstack (//pkg/tcpip) buildable for 32 bit

Doing so involved breaking dependencies between //pkg/tcpip and the rest
of gVisor, which are discouraged anyways.

Tested on the Go branch via:
  gvisor.dev/gvisor/pkg/tcpip/...

Addresses #1446.

PiperOrigin-RevId: 363081778

1 files changed, 19 insertions, 0 deletions

diff --git a/pkg/iovec/iovec_max.go b/pkg/iovec/iovec_max.go
new file mode 100644
index 000000000..724b256e8
--- /dev/null
+++ b/pkg/iovec/iovec_max.go
@@ -0,0 +1,19 @@
+// Copyright 2021 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 iovec
+
+// MaxIovs is the maximum number of iovecs host platform can accept. It
+// corresponds to Linux's UIO_MAXIOV, which is not in the unix package.
+const MaxIovs = 1024