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78 lines
3.1 KiB
78 lines
3.1 KiB
/* |
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* Copyright (C) 2017 The Android Open Source Project |
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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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*/ |
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#ifndef NETD_SERVER_NETLINK_UTIL_H |
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#define NETD_SERVER_NETLINK_UTIL_H |
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#include <functional> |
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#include <linux/netlink.h> |
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#include <linux/rtnetlink.h> |
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#include "NetdConstants.h" |
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namespace android { |
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namespace net { |
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const sockaddr_nl KERNEL_NLADDR = {AF_NETLINK, 0, 0, 0}; |
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const uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK; |
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const uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL; |
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const uint16_t NETLINK_DUMP_FLAGS = NLM_F_REQUEST | NLM_F_DUMP; |
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// Generic code for processing netlink dumps. |
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const int kNetlinkDumpBufferSize = 8192; |
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typedef std::function<void(nlmsghdr *)> NetlinkDumpCallback; |
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typedef std::function<bool(nlmsghdr *)> NetlinkDumpFilter; |
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// Opens an RTNetlink socket and connects it to the kernel. |
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WARN_UNUSED_RESULT int openNetlinkSocket(int protocol); |
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// Receives a netlink ACK. Returns 0 if the command succeeded or negative errno if the command |
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// failed or receiving the ACK failed. |
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WARN_UNUSED_RESULT int recvNetlinkAck(int sock); |
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// Sends a netlink request and possibly expects an ACK. The first element of iov should be null and |
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// will be set to the netlink message headerheader. The subsequent elements are the contents of the |
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// request. |
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// Disable optimizations in ASan build. |
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// ASan reports an out-of-bounds 32-bit(!) access in the first loop of the |
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// function (over iov[]). |
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#ifdef __clang__ |
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#if __has_feature(address_sanitizer) |
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__attribute__((optnone)) |
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#endif |
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#endif |
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WARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen, |
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const NetlinkDumpCallback *callback); |
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// Processes a netlink dump, passing every message to the specified |callback|. |
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WARN_UNUSED_RESULT int processNetlinkDump(int sock, const NetlinkDumpCallback& callback); |
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// Flushes netlink objects that take an rtmsg structure (FIB rules, routes...). |getAction| and |
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// |deleteAction| specify the netlink message types, e.g., RTM_GETRULE and RTM_DELRULE. |
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// |shouldDelete| specifies whether a given object should be deleted or not. |what| is a |
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// human-readable name for the objects being flushed, e.g. "rules". |
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WARN_UNUSED_RESULT int rtNetlinkFlush(uint16_t getAction, uint16_t deleteAction, |
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const char *what, const NetlinkDumpFilter& shouldDelete); |
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// Returns the value of the specific __u32 attribute, or 0 if the attribute was not present. |
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uint32_t getRtmU32Attribute(const nlmsghdr *nlh, int attribute); |
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} // namespace net |
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} // namespace android |
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#endif // NETD_SERVER_NETLINK_UTIL_H
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