102 lines
3.0 KiB
C++
102 lines
3.0 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <sys/socket.h>
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#include <linux/if_arp.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <vector>
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#include "absl/strings/str_cat.h"
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#include "test/syscalls/linux/socket_netlink_util.h"
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#include "test/syscalls/linux/socket_test_util.h"
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namespace gvisor {
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namespace testing {
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PosixErrorOr<FileDescriptor> NetlinkBoundSocket() {
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FileDescriptor fd;
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ASSIGN_OR_RETURN_ERRNO(fd, Socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE));
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struct sockaddr_nl addr = {};
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addr.nl_family = AF_NETLINK;
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RETURN_ERROR_IF_SYSCALL_FAIL(
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bind(fd.get(), reinterpret_cast<struct sockaddr*>(&addr), sizeof(addr)));
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MaybeSave();
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return std::move(fd);
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}
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PosixErrorOr<uint32_t> NetlinkPortID(int fd) {
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struct sockaddr_nl addr;
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socklen_t addrlen = sizeof(addr);
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RETURN_ERROR_IF_SYSCALL_FAIL(
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getsockname(fd, reinterpret_cast<struct sockaddr*>(&addr), &addrlen));
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MaybeSave();
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return static_cast<uint32_t>(addr.nl_pid);
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}
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PosixError NetlinkRequestResponse(
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const FileDescriptor& fd, void* request, size_t len,
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const std::function<void(const struct nlmsghdr* hdr)>& fn) {
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struct iovec iov = {};
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iov.iov_base = request;
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iov.iov_len = len;
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struct msghdr msg = {};
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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// No destination required; it defaults to pid 0, the kernel.
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RETURN_ERROR_IF_SYSCALL_FAIL(RetryEINTR(sendmsg)(fd.get(), &msg, 0));
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constexpr size_t kBufferSize = 4096;
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std::vector<char> buf(kBufferSize);
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iov.iov_base = buf.data();
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iov.iov_len = buf.size();
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// Response is a series of NLM_F_MULTI messages, ending with a NLMSG_DONE
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// message.
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int type = -1;
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do {
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int len;
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RETURN_ERROR_IF_SYSCALL_FAIL(len = RetryEINTR(recvmsg)(fd.get(), &msg, 0));
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// We don't bother with the complexity of dealing with truncated messages.
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// We must allocate a large enough buffer up front.
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if ((msg.msg_flags & MSG_TRUNC) == MSG_TRUNC) {
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return PosixError(EIO,
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absl::StrCat("Received truncated message with flags: ",
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msg.msg_flags));
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}
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for (struct nlmsghdr* hdr = reinterpret_cast<struct nlmsghdr*>(buf.data());
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NLMSG_OK(hdr, len); hdr = NLMSG_NEXT(hdr, len)) {
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fn(hdr);
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type = hdr->nlmsg_type;
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}
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} while (type != NLMSG_DONE && type != NLMSG_ERROR);
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EXPECT_EQ(type, NLMSG_DONE);
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return NoError();
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}
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} // namespace testing
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} // namespace gvisor
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