blob: 470cf043f544869018c1901bcdbbee7cb80b8c9c [file] [log] [blame]
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <errno.h>
#include <time.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/ether.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <fcntl.h>
#include <base/bind.h>
#include "shill/error.h"
#include "shill/event_dispatcher.h"
#include "shill/io_handler.h"
#include "shill/ip_address.h"
#include "shill/ipconfig.h"
#include "shill/logging.h"
#include "shill/rtnl_handler.h"
#include "shill/rtnl_listener.h"
#include "shill/rtnl_message.h"
#include "shill/sockets.h"
using base::Bind;
using base::Unretained;
using std::string;
namespace shill {
// Keep this large enough to avoid overflows on IPv6 SNM routing update spikes
const int RTNLHandler::kReceiveBufferSize = 512 * 1024;
namespace {
base::LazyInstance<RTNLHandler> g_rtnl_handler = LAZY_INSTANCE_INITIALIZER;
} // namespace
RTNLHandler::RTNLHandler()
: sockets_(NULL),
in_request_(false),
rtnl_socket_(-1),
request_flags_(0),
request_sequence_(0),
last_dump_sequence_(0),
rtnl_callback_(Bind(&RTNLHandler::ParseRTNL, Unretained(this))) {
SLOG(RTNL, 2) << "RTNLHandler created";
}
RTNLHandler::~RTNLHandler() {
SLOG(RTNL, 2) << "RTNLHandler removed";
Stop();
}
RTNLHandler* RTNLHandler::GetInstance() {
return g_rtnl_handler.Pointer();
}
void RTNLHandler::Start(EventDispatcher *dispatcher, Sockets *sockets) {
struct sockaddr_nl addr;
if (sockets_) {
return;
}
rtnl_socket_ = sockets->Socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
if (rtnl_socket_ < 0) {
LOG(ERROR) << "Failed to open rtnl socket";
return;
}
if (sockets->SetReceiveBuffer(rtnl_socket_, kReceiveBufferSize)) {
LOG(ERROR) << "Failed to increase receive buffer size";
}
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE |
RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_ROUTE;
if (sockets->Bind(rtnl_socket_,
reinterpret_cast<struct sockaddr *>(&addr),
sizeof(addr)) < 0) {
sockets->Close(rtnl_socket_);
rtnl_socket_ = -1;
LOG(ERROR) << "RTNL socket bind failed";
return;
}
rtnl_handler_.reset(dispatcher->CreateInputHandler(
rtnl_socket_,
rtnl_callback_,
Bind(&RTNLHandler::OnReadError, Unretained(this))));
sockets_ = sockets;
NextRequest(last_dump_sequence_);
SLOG(RTNL, 2) << "RTNLHandler started";
}
void RTNLHandler::Stop() {
if (!sockets_)
return;
rtnl_handler_.reset();
sockets_->Close(rtnl_socket_);
in_request_ = false;
sockets_ = NULL;
request_flags_ = 0;
SLOG(RTNL, 2) << "RTNLHandler stopped";
}
void RTNLHandler::AddListener(RTNLListener *to_add) {
std::vector<RTNLListener *>::iterator it;
for (it = listeners_.begin(); it != listeners_.end(); ++it) {
if (to_add == *it)
return;
}
listeners_.push_back(to_add);
SLOG(RTNL, 2) << "RTNLHandler added listener";
}
void RTNLHandler::RemoveListener(RTNLListener *to_remove) {
std::vector<RTNLListener *>::iterator it;
for (it = listeners_.begin(); it != listeners_.end(); ++it) {
if (to_remove == *it) {
listeners_.erase(it);
return;
}
}
SLOG(RTNL, 2) << "RTNLHandler removed listener";
}
void RTNLHandler::SetInterfaceFlags(int interface_index, unsigned int flags,
unsigned int change) {
if (!sockets_) {
LOG(ERROR) << __func__ << " called while not started. "
"Assuming we are in unit tests.";
return;
}
struct rtnl_request {
struct nlmsghdr hdr;
struct ifinfomsg msg;
} req;
request_sequence_++;
memset(&req, 0, sizeof(req));
req.hdr.nlmsg_len = sizeof(req);
req.hdr.nlmsg_flags = NLM_F_REQUEST;
req.hdr.nlmsg_pid = 0;
req.hdr.nlmsg_seq = request_sequence_;
req.hdr.nlmsg_type = RTM_NEWLINK;
req.msg.ifi_index = interface_index;
req.msg.ifi_flags = flags;
req.msg.ifi_change = change;
if (sockets_->Send(rtnl_socket_, &req, sizeof(req), 0) < 0) {
LOG(ERROR) << "RTNL sendto failed: " << strerror(errno);
}
}
void RTNLHandler::RequestDump(int request_flags) {
request_flags_ |= request_flags;
SLOG(RTNL, 2) << "RTNLHandler got request to dump "
<< std::showbase << std::hex
<< request_flags
<< std::dec << std::noshowbase;
if (!in_request_ && sockets_)
NextRequest(last_dump_sequence_);
}
void RTNLHandler::DispatchEvent(int type, const RTNLMessage &msg) {
std::vector<RTNLListener *>::iterator it;
for (it = listeners_.begin(); it != listeners_.end(); ++it) {
(*it)->NotifyEvent(type, msg);
}
}
void RTNLHandler::NextRequest(uint32 seq) {
int flag = 0;
RTNLMessage::Type type;
SLOG(RTNL, 2) << "RTNLHandler nextrequest " << seq << " "
<< last_dump_sequence_
<< std::showbase << std::hex
<< " " << request_flags_
<< std::dec << std::noshowbase;
if (seq != last_dump_sequence_)
return;
if ((request_flags_ & kRequestAddr) != 0) {
type = RTNLMessage::kTypeAddress;
flag = kRequestAddr;
} else if ((request_flags_ & kRequestRoute) != 0) {
type = RTNLMessage::kTypeRoute;
flag = kRequestRoute;
} else if ((request_flags_ & kRequestLink) != 0) {
type = RTNLMessage::kTypeLink;
flag = kRequestLink;
} else {
SLOG(RTNL, 2) << "Done with requests";
in_request_ = false;
return;
}
RTNLMessage msg(
type,
RTNLMessage::kModeGet,
0,
0,
0,
0,
IPAddress::kFamilyUnknown);
CHECK(SendMessage(&msg));
last_dump_sequence_ = msg.seq();
request_flags_ &= ~flag;
in_request_ = true;
}
void RTNLHandler::ParseRTNL(InputData *data) {
unsigned char *buf = data->buf;
unsigned char *end = buf + data->len;
while (buf < end) {
struct nlmsghdr *hdr = reinterpret_cast<struct nlmsghdr *>(buf);
if (!NLMSG_OK(hdr, static_cast<unsigned int>(end - buf)))
break;
SLOG(RTNL, 3) << __func__ << ": received payload (" << end - buf << ")";
RTNLMessage msg;
ByteString payload(reinterpret_cast<unsigned char *>(hdr), hdr->nlmsg_len);
SLOG(RTNL, 5) << "RTNL received payload length " << payload.GetLength()
<< ": \"" << payload.HexEncode() << "\"";
if (!msg.Decode(payload)) {
SLOG(RTNL, 3) << __func__ << ": rtnl packet type "
<< hdr->nlmsg_type
<< " length " << hdr->nlmsg_len
<< " sequence " << hdr->nlmsg_seq;
switch (hdr->nlmsg_type) {
case NLMSG_NOOP:
case NLMSG_OVERRUN:
break;
case NLMSG_DONE:
NextRequest(hdr->nlmsg_seq);
break;
case NLMSG_ERROR:
{
struct nlmsgerr *err =
reinterpret_cast<nlmsgerr *>(NLMSG_DATA(hdr));
LOG(ERROR) << "error " << -err->error << " ("
<< strerror(-err->error) << ")";
break;
}
default:
NOTIMPLEMENTED() << "Unknown NL message type.";
}
} else {
switch (msg.type()) {
case RTNLMessage::kTypeLink:
DispatchEvent(kRequestLink, msg);
break;
case RTNLMessage::kTypeAddress:
DispatchEvent(kRequestAddr, msg);
break;
case RTNLMessage::kTypeRoute:
DispatchEvent(kRequestRoute, msg);
break;
default:
NOTIMPLEMENTED() << "Unknown RTNL message type.";
}
}
buf += hdr->nlmsg_len;
}
}
bool RTNLHandler::AddressRequest(int interface_index,
RTNLMessage::Mode mode,
int flags,
const IPAddress &local,
const IPAddress &broadcast,
const IPAddress &peer) {
CHECK(local.family() == broadcast.family());
CHECK(local.family() == peer.family());
RTNLMessage msg(
RTNLMessage::kTypeAddress,
mode,
NLM_F_REQUEST | flags,
0,
0,
interface_index,
local.family());
msg.set_address_status(RTNLMessage::AddressStatus(
local.prefix(),
0,
0));
msg.SetAttribute(IFA_LOCAL, local.address());
if (!broadcast.IsDefault()) {
msg.SetAttribute(IFA_BROADCAST, broadcast.address());
}
if (!peer.IsDefault()) {
msg.SetAttribute(IFA_ADDRESS, peer.address());
}
return SendMessage(&msg);
}
bool RTNLHandler::AddInterfaceAddress(int interface_index,
const IPAddress &local,
const IPAddress &broadcast,
const IPAddress &peer) {
return AddressRequest(interface_index,
RTNLMessage::kModeAdd,
NLM_F_CREATE | NLM_F_EXCL | NLM_F_ECHO,
local,
broadcast,
peer);
}
bool RTNLHandler::RemoveInterfaceAddress(int interface_index,
const IPAddress &local) {
return AddressRequest(interface_index,
RTNLMessage::kModeDelete,
NLM_F_ECHO,
local,
IPAddress(local.family()),
IPAddress(local.family()));
}
bool RTNLHandler::RemoveInterface(int interface_index) {
RTNLMessage msg(
RTNLMessage::kTypeLink,
RTNLMessage::kModeDelete,
NLM_F_REQUEST,
0,
0,
interface_index,
IPAddress::kFamilyUnknown);
return SendMessage(&msg);
}
int RTNLHandler::GetInterfaceIndex(const string &interface_name) {
if (interface_name.empty()) {
LOG(ERROR) << "Empty interface name -- unable to obtain index.";
return -1;
}
struct ifreq ifr;
if (interface_name.size() >= sizeof(ifr.ifr_name)) {
LOG(ERROR) << "Interface name too long: " << interface_name.size() << " >= "
<< sizeof(ifr.ifr_name);
return -1;
}
int socket = sockets_->Socket(PF_INET, SOCK_DGRAM, 0);
if (socket < 0) {
PLOG(ERROR) << "Unable to open INET socket";
return -1;
}
ScopedSocketCloser socket_closer(sockets_, socket);
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, interface_name.c_str(), sizeof(ifr.ifr_name));
if (sockets_->Ioctl(socket, SIOCGIFINDEX, &ifr) < 0) {
PLOG(ERROR) << "SIOCGIFINDEX error for " << interface_name;
return -1;
}
return ifr.ifr_ifindex;
}
bool RTNLHandler::SendMessage(RTNLMessage *message) {
message->set_seq(request_sequence_);
ByteString msgdata = message->Encode();
if (msgdata.GetLength() == 0) {
return false;
}
SLOG(RTNL, 5) << "RTNL sending payload with request sequence "
<< request_sequence_ << ", length " << msgdata.GetLength()
<< ": \"" << msgdata.HexEncode() << "\"";
request_sequence_++;
if (sockets_->Send(rtnl_socket_,
msgdata.GetConstData(),
msgdata.GetLength(),
0) < 0) {
PLOG(ERROR) << "RTNL send failed: " << strerror(errno);
return false;
}
return true;
}
void RTNLHandler::OnReadError(const Error &error) {
LOG(FATAL) << "RTNL Socket read returns error: "
<< error.message();
}
} // namespace shill