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271 lines
8.9 KiB
271 lines
8.9 KiB
/*
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* Copyright (C) 2016 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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#include "wificond/net/nl80211_attribute.h"
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using std::string;
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using std::vector;
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namespace android {
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namespace wificond {
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// Explicit instantiation
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template class NL80211Attr<uint8_t>;
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template class NL80211Attr<uint16_t>;
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template class NL80211Attr<uint32_t>;
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template class NL80211Attr<uint64_t>;
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template class NL80211Attr<vector<uint8_t>>;
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template class NL80211Attr<string>;
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// For BaseNL80211Attr
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BaseNL80211Attr::BaseNL80211Attr(int id,
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const vector<uint8_t>& raw_buffer) {
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size_t size = raw_buffer.size();
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InitHeaderAndResize(id, size);
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memcpy(data_.data() + NLA_HDRLEN, raw_buffer.data(), raw_buffer.size());
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}
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void BaseNL80211Attr::InitHeaderAndResize(int attribute_id,
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int payload_length) {
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data_.resize(NLA_HDRLEN + NLA_ALIGN(payload_length), 0);
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nlattr* header = reinterpret_cast<nlattr*>(data_.data());
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header->nla_type = attribute_id;
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header->nla_len = NLA_HDRLEN + payload_length;
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}
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int BaseNL80211Attr::GetAttributeId() const {
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const nlattr* header = reinterpret_cast<const nlattr*>(data_.data());
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return header->nla_type;
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}
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bool BaseNL80211Attr::IsValid() const {
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if (data_.size() < NLA_HDRLEN) {
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return false;
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}
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const nlattr* header = reinterpret_cast<const nlattr*>(data_.data());
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return NLA_ALIGN(header->nla_len) == data_.size();
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}
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const vector<uint8_t>& BaseNL80211Attr::GetConstData() const {
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return data_;
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}
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bool BaseNL80211Attr::GetAttributeImpl(const uint8_t* buf,
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size_t len,
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int attr_id,
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uint8_t** attr_start,
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uint8_t** attr_end) {
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// Skip the top level attribute header.
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const uint8_t* ptr = buf;
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const uint8_t* end_ptr = buf + len;
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while (ptr + NLA_HDRLEN <= end_ptr) {
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const nlattr* header = reinterpret_cast<const nlattr*>(ptr);
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if (header->nla_type == attr_id) {
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if (ptr + NLA_ALIGN(header->nla_len) > end_ptr) {
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LOG(ERROR) << "Failed to get attribute: broken nl80211 atrribute.";
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return false;
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}
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if (attr_start != nullptr && attr_end != nullptr) {
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*attr_start = const_cast<uint8_t*>(ptr);
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*attr_end = const_cast<uint8_t*>(ptr + NLA_ALIGN(header->nla_len));
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}
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return true;
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}
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ptr += NLA_ALIGN(header->nla_len);
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}
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return false;
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}
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bool BaseNL80211Attr::Merge(const BaseNL80211Attr& other_attr) {
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if (!other_attr.IsValid()) {
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LOG(ERROR) << "Can not merge invalid attribute";
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return false;
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}
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if (GetAttributeId() != other_attr.GetAttributeId()) {
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LOG(ERROR) << "Can not merge attributes with different ids";
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return false;
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}
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auto our_header = reinterpret_cast<nlattr*>(data_.data());
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int our_len_without_padding = our_header->nla_len;
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auto other_header =
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reinterpret_cast<const nlattr*>(other_attr.GetConstData().data());
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int other_len_without_padding = other_header->nla_len;
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// Update the length to include the content of |other_attr|.
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int total_len_without_padding =
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our_len_without_padding + other_len_without_padding - NLA_HDRLEN;
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our_header->nla_len = total_len_without_padding;
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// Remove padding 0s.
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data_.resize(our_len_without_padding);
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// Insert content of |other_attr|.
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data_.insert(
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data_.end(),
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reinterpret_cast<const uint8_t*>(other_header) + NLA_HDRLEN,
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reinterpret_cast<const uint8_t*>(other_header) +
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other_len_without_padding);
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// Add padding 0s.
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data_.resize(NLA_ALIGN(total_len_without_padding), 0);
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return true;
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}
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// For NL80211Attr<std::vector<uint8_t>>
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NL80211Attr<vector<uint8_t>>::NL80211Attr(int id,
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const vector<uint8_t>& raw_buffer) : BaseNL80211Attr(id, raw_buffer) {
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}
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NL80211Attr<vector<uint8_t>>::NL80211Attr(
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const vector<uint8_t>& data) {
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data_ = data;
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}
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vector<uint8_t> NL80211Attr<vector<uint8_t>>::GetValue() const {
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const nlattr* header = reinterpret_cast<const nlattr*>(data_.data());
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return vector<uint8_t>(
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data_.data() + NLA_HDRLEN,
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data_.data() + header->nla_len);
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}
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// For NL80211Attr<std::string>
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NL80211Attr<string>::NL80211Attr(int id, const string& str) {
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size_t size = str.size();
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// This string is storaged as a null-terminated string.
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// Buffer is initialized with 0s so we only need to make a space for
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// the null terminator.
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InitHeaderAndResize(id, size + 1);
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char* storage = reinterpret_cast<char*>(data_.data() + NLA_HDRLEN);
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str.copy(storage, size);
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}
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NL80211Attr<string>::NL80211Attr(const vector<uint8_t>& data) {
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data_ = data;
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}
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string NL80211Attr<string>::GetValue() const {
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const nlattr* header = reinterpret_cast<const nlattr*>(data_.data());
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size_t str_length = header->nla_len - NLA_HDRLEN;
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// Remove trailing zeros.
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while (str_length > 0 &&
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*(data_.data() + NLA_HDRLEN + str_length - 1) == 0) {
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str_length--;
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}
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return string(reinterpret_cast<const char*>(data_.data() + NLA_HDRLEN),
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str_length);
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}
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// For NL80211NestedAttr
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NL80211NestedAttr::NL80211NestedAttr(int id) {
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InitHeaderAndResize(id, 0);
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}
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NL80211NestedAttr::NL80211NestedAttr(const vector<uint8_t>& data) {
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data_ = data;
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}
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void NL80211NestedAttr::AddAttribute(const BaseNL80211Attr& attribute) {
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const vector<uint8_t>& append_data = attribute.GetConstData();
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// Append the data of |attribute| to |this|.
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data_.insert(data_.end(), append_data.begin(), append_data.end());
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nlattr* header = reinterpret_cast<nlattr*>(data_.data());
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// We don't need to worry about padding for nested attribute.
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// Because as long as all sub attributes have padding, the payload is aligned.
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header->nla_len += append_data.size();
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}
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void NL80211NestedAttr::AddFlagAttribute(int attribute_id) {
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// We only need to append a header for flag attribute.
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// Make space for the new attribute.
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data_.resize(data_.size() + NLA_HDRLEN, 0);
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nlattr* flag_header =
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reinterpret_cast<nlattr*>(data_.data() + data_.size() - NLA_HDRLEN);
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flag_header->nla_type = attribute_id;
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flag_header->nla_len = NLA_HDRLEN;
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nlattr* nl_header = reinterpret_cast<nlattr*>(data_.data());
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nl_header->nla_len += NLA_HDRLEN;
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}
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bool NL80211NestedAttr::HasAttribute(int id) const {
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return BaseNL80211Attr::GetAttributeImpl(data_.data() + NLA_HDRLEN,
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data_.size() - NLA_HDRLEN,
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id, nullptr, nullptr);
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}
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bool NL80211NestedAttr::GetAttribute(int id,
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NL80211NestedAttr* attribute) const {
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uint8_t* start = nullptr;
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uint8_t* end = nullptr;
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if (!BaseNL80211Attr::GetAttributeImpl(data_.data() + NLA_HDRLEN,
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data_.size() - NLA_HDRLEN,
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id, &start, &end) ||
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start == nullptr ||
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end == nullptr) {
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return false;
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}
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*attribute = NL80211NestedAttr(vector<uint8_t>(start, end));
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if (!attribute->IsValid()) {
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return false;
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}
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return true;
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}
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bool NL80211NestedAttr::GetListOfNestedAttributes(
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vector<NL80211NestedAttr>* value) const {
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const uint8_t* ptr = data_.data() + NLA_HDRLEN;
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const uint8_t* end_ptr = data_.data() + data_.size();
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vector<NL80211NestedAttr> nested_attr_list;
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while (ptr + NLA_HDRLEN <= end_ptr) {
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const nlattr* header = reinterpret_cast<const nlattr*>(ptr);
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if (ptr + NLA_ALIGN(header->nla_len) > end_ptr) {
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LOG(ERROR) << "Failed to get list of nested attributes: invalid nla_len.";
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return false;
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}
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nested_attr_list.emplace_back(
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NL80211NestedAttr(vector<uint8_t>(ptr,
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ptr + NLA_ALIGN(header->nla_len))));
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if (!nested_attr_list.back().IsValid()) {
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return false;
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}
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ptr += NLA_ALIGN(header->nla_len);
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}
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*value = std::move(nested_attr_list);
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return true;
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}
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void NL80211NestedAttr::DebugLog() const {
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const uint8_t* ptr = data_.data() + NLA_HDRLEN;
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const uint8_t* end_ptr = data_.data() + data_.size();
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while (ptr + NLA_HDRLEN <= end_ptr) {
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const nlattr* header = reinterpret_cast<const nlattr*>(ptr);
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if (ptr + NLA_ALIGN(header->nla_len) > end_ptr) {
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LOG(ERROR) << "broken nl80211 atrribute.";
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return;
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}
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LOG(INFO) << "Have attribute with nla_type=" << header->nla_type
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<< " and nla_len=" << header->nla_len;
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if (header->nla_len == 0) {
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LOG(ERROR) << "0 is a bad nla_len";
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return;
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}
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ptr += NLA_ALIGN(header->nla_len);
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}
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}
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} // namespace wificond
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} // namespace android
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