Implement the PacketMMapEndpoint interface for PACKET_MMAP.

This code is tested in the subsequent change with syscall tests.

PiperOrigin-RevId: 721861305

pkg/sentry/socket/netstack/packetmmap/BUILD

@@ -0,0 +1,37 @@
+load("//tools:defs.bzl", "go_library")
+
+package(
+    default_applicable_licenses = ["//:license"],
+    licenses = ["notice"],
+)
+
+go_library(
+    name = "packetmmap",
+    srcs = [
+        "endpoint.go",
+        "endpoint_state.go",
+        "ring_buffer.go",
+    ],
+    visibility = [
+        "//visibility:public",
+    ],
+    deps = [
+        "//pkg/abi/linux",
+        "//pkg/atomicbitops",
+        "//pkg/bitmap",
+        "//pkg/buffer",
+        "//pkg/context",
+        "//pkg/errors/linuxerr",
+        "//pkg/hostarch",
+        "//pkg/safemem",
+        "//pkg/sentry/memmap",
+        "//pkg/sentry/pgalloc",
+        "//pkg/sentry/socket",
+        "//pkg/sentry/usage",
+        "//pkg/sync",
+        "//pkg/tcpip",
+        "//pkg/tcpip/header",
+        "//pkg/tcpip/stack",
+        "//pkg/waiter",
+    ],
+)