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/*
* Copyright (c) 2017, The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of The Linux Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* External Includes */
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <vector>
/* Internal Includes */
#include "IOffloadManager.h"
#include "PrefixParser.h"
/* Avoiding namespace pollution */
using IP_FAM = ::IOffloadManager::IP_FAM;
using Prefix = ::IOffloadManager::Prefix;
using ::std::string;
using ::std::vector;
/* ------------------------------ PUBLIC ------------------------------------ */
PrefixParser::PrefixParser() {
mLastErr = "No Err";
} /* PrefixParser */
bool PrefixParser::add(vector<string> in) {
return add(in, IP_FAM::INVALID);
} /* add */
bool PrefixParser::add(string in) {
return add(in, IP_FAM::INVALID);
} /* add */
bool PrefixParser::addV4(string in) {
return add(in, IP_FAM::V4);
} /* addV4 */
bool PrefixParser::addV4(vector<string> in) {
return add(in, IP_FAM::V4);
} /* addV4 */
bool PrefixParser::addV6(string in) {
return add(in, IP_FAM::V6);
} /* addV6 */
bool PrefixParser::addV6(vector<string> in) {
for (size_t i = 0; i < in.size(); i++) {
if (!addV6(in[i]))
return false;
}
return true;
} /* addV6 */
int PrefixParser::size() {
return mPrefixes.size();
} /* size */
bool PrefixParser::allAreFullyQualified() {
for (size_t i = 0; i < mPrefixes.size(); i++) {
if (mPrefixes[i].fam == IP_FAM::V4) {
uint32_t masked = mPrefixes[i].v4Addr & mPrefixes[i].v4Mask;
if (masked != mPrefixes[i].v4Addr)
return false;
} else {
uint32_t masked[4];
masked[0] = mPrefixes[i].v6Addr[0] & mPrefixes[i].v6Mask[0];
masked[1] = mPrefixes[i].v6Addr[1] & mPrefixes[i].v6Mask[1];
masked[2] = mPrefixes[i].v6Addr[2] & mPrefixes[i].v6Mask[2];
masked[3] = mPrefixes[i].v6Addr[3] & mPrefixes[i].v6Mask[3];
for (int j = 0; j < 4; j++) {
if (masked[j] != mPrefixes[i].v6Addr[j])
return false;
}
}
}
return true;
} /* allAreFullyQualified */
Prefix PrefixParser::getFirstPrefix() {
if (size() >= 1)
return mPrefixes[0];
return makeBlankPrefix(IP_FAM::INVALID);
} /* getFirstPrefix */
string PrefixParser::getLastErrAsStr() {
return mLastErr;
} /* getLastErrAsStr */
/* ------------------------------ PRIVATE ----------------------------------- */
bool PrefixParser::add(vector<string> in, IP_FAM famHint) {
for (size_t i = 0; i < in.size(); i++) {
if (!add(in[i], famHint))
return false;
}
return true;
} /* add */
bool PrefixParser::add(string in, IP_FAM famHint) {
if (famHint == IP_FAM::INVALID)
famHint = guessIPFamily(in);
string subnet;
string addr;
if (!splitIntoAddrAndMask(in, addr, subnet)) {
mLastErr = "Failed to split into Address and Mask(" + in + ")";
return false;
}
int mask = parseSubnetMask(subnet, famHint);
if (!isMaskValid(mask, famHint))
return false;
Prefix pre = makeBlankPrefix(famHint);
if (famHint == IP_FAM::V4) {
if (!parseV4Addr(addr, pre)) {
mLastErr = "Failed to parse V4 Address(" + addr + ")";
return false;
}
} else if (!parseV6Addr(addr, pre)) {
mLastErr = "Failed to parse V6 Address(" + addr + ")";
return false;
}
if (famHint == IP_FAM::V4 && !populateV4Mask(mask, pre)) {
mLastErr = "Failed to populate IPv4 Mask(" + std::to_string(mask)
+ ", " + addr + ")";
return false;
} else if (!populateV6Mask(mask, pre)) {
mLastErr = "Failed to populate IPv6 Mask(" + std::to_string(mask)
+ ", " + addr + ")";
return false;
}
mPrefixes.push_back(pre);
return true;
} /* add */
/* Assumption (based on man inet_pton)
*
* X represents a hex character
* d represents a base 10 digit
* / represents the start of the subnet mask
* (assume that it can be left off of all below combinations)
*
* IPv4 Addresses always look like the following:
* ddd.ddd.ddd.ddd/dd
*
* IPv6 Addresses can look a few different ways:
* x:x:x:x:x:x:x:x/ddd
* x::x/ddd
* x:x:x:x:x:x:d.d.d.d/ddd
*
* Therefore, if a presentation of an IP Address contains a colon, then it
* may not be a valid IPv6, but, it is definitely not valid IPv4. If a
* presentation of an IP Address does not contain a colon, then it may not be
* a valid IPv4, but, it is definitely not IPv6.
*/
IP_FAM PrefixParser::guessIPFamily(string in) {
size_t found = in.find(":");
if (found != string::npos)
return IP_FAM::V6;
return IP_FAM::V4;
} /* guessIPFamily */
bool PrefixParser::splitIntoAddrAndMask(string in, string &addr, string &mask) {
size_t pos = in.find("/");
if (pos != string::npos && pos >= 1) {
/* addr is now everything up until the first / */
addr = in.substr(0, pos);
} else if (pos == string::npos) {
/* There is no /, so the entire input is an address */
addr = in;
} else {
/* There was nothing before the /, not recoverable */
return false;
}
if (pos != string::npos && pos < in.size()) {
/* There is a / and it is not the last character. Everything after /
* must be the subnet.
*/
mask = in.substr(pos + 1);
} else if (pos != string::npos && pos == in.size()) {
/* There is a /, but it is the last character. This is garbage, but,
* we may still be able to interpret the address so we will throw it
* out.
*/
mask = "";
} else if (pos == string::npos) {
/* There is no /, therefore, there is no subnet */
mask = "";
} else {
/* This really shouldn't be possible because it would imply that find
* returned a position larger than the size of the input. Just
* preserving sanity that mask is always initialized.
*/
mask = "";
}
return true;
} /* splitIntoAddrAndMask */
int PrefixParser::parseSubnetMask(string in, IP_FAM famHint) {
if (in.empty())
/* Treat no subnet mask as fully qualified */
return (famHint == IP_FAM::V6) ? 128 : 32;
return atoi(in.c_str());
} /* parseSubnetMask */
bool PrefixParser::parseV4Addr(string in, Prefix &out) {
struct sockaddr_in sa;
int ret = inet_pton(AF_INET, in.c_str(), &(sa.sin_addr));
if (ret < 0) {
/* errno would be valid */
return false;
} else if (ret == 0) {
/* input was not a valid IP address */
return false;
}
/* Address in network byte order */
out.v4Addr = htonl(sa.sin_addr.s_addr);
return true;
} /* parseV4Addr */
bool PrefixParser::parseV6Addr(string in, Prefix &out) {
struct sockaddr_in6 sa;
int ret = inet_pton(AF_INET6, in.c_str(), &(sa.sin6_addr));
if (ret < 0) {
/* errno would be valid */
return false;
} else if (ret == 0) {
/* input was not a valid IP address */
return false;
}
/* Translate unsigned chars to unsigned ints to match IPA
*
* TODO there must be a better way to do this beyond bit fiddling
* Maybe a Union since we've already made the assumption that the data
* structures match?
*/
out.v6Addr[0] = (sa.sin6_addr.s6_addr[0] << 24) |
(sa.sin6_addr.s6_addr[1] << 16) |
(sa.sin6_addr.s6_addr[2] << 8) |
(sa.sin6_addr.s6_addr[3]);
out.v6Addr[1] = (sa.sin6_addr.s6_addr[4] << 24) |
(sa.sin6_addr.s6_addr[5] << 16) |
(sa.sin6_addr.s6_addr[6] << 8) |
(sa.sin6_addr.s6_addr[7]);
out.v6Addr[2] = (sa.sin6_addr.s6_addr[8] << 24) |
(sa.sin6_addr.s6_addr[9] << 16) |
(sa.sin6_addr.s6_addr[10] << 8) |
(sa.sin6_addr.s6_addr[11]);
out.v6Addr[3] = (sa.sin6_addr.s6_addr[12] << 24) |
(sa.sin6_addr.s6_addr[13] << 16) |
(sa.sin6_addr.s6_addr[14] << 8) |
(sa.sin6_addr.s6_addr[15]);
return true;
} /* parseV6Addr */
bool PrefixParser::populateV4Mask(int mask, Prefix &out) {
if (mask < 0 || mask > 32)
return false;
out.v4Mask = createMask(mask);
return true;
} /* populateV4Mask */
bool PrefixParser::populateV6Mask(int mask, Prefix &out) {
if (mask < 0 || mask > 128)
return false;
for (int i = 0; i < 4; i++) {
out.v6Mask[i] = createMask(mask);
mask = (mask > 32) ? mask - 32 : 0;
}
return true;
} /* populateV6Mask */
uint32_t PrefixParser::createMask(int mask) {
uint32_t ret = 0;
if (mask >= 32) {
ret = ~ret;
return ret;
}
for (int i = 0; i < 32; i++) {
if (i < mask)
ret = (ret << 1) | 1;
else
ret = (ret << 1);
}
return ret;
} /* createMask */
Prefix PrefixParser::makeBlankPrefix(IP_FAM famHint) {
Prefix ret;
ret.fam = famHint;
ret.v4Addr = 0;
ret.v4Mask = 0;
ret.v6Addr[0] = 0;
ret.v6Addr[1] = 0;
ret.v6Addr[2] = 0;
ret.v6Addr[3] = 0;
ret.v6Mask[0] = 0;
ret.v6Mask[1] = 0;
ret.v6Mask[2] = 0;
ret.v6Mask[3] = 0;
return ret;
} /* makeBlankPrefix */
bool PrefixParser::isMaskValid(int mask, IP_FAM fam) {
if (mask < 0) {
mLastErr = "Failed parse subnet mask(" + std::to_string(mask) + ")";
return false;
} else if (mask == 0) {
mLastErr = "Subnet mask cannot be 0(" + std::to_string(mask) + ")";
return false;
} else if (fam == IP_FAM::V4 && mask > 32) {
mLastErr = "Interpreted address as V4 but mask was too large("
+ std::to_string(mask) + ")";
return false;
} else if (fam == IP_FAM::V6 && mask > 128) {
mLastErr = "Interpreted address as V6 but mask was too large("
+ std::to_string(mask) + ")";
return false;
}
return true;
} /* isMaskValid */