rtc_base/macifaddrs_converter.cc - src/webrtc - Git at Google

 /*
  *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */

 #include <memory>

 #include <net/if.h>
 #include <sys/ioctl.h>
 #include <unistd.h>

 #include "webrtc/rtc_base/checks.h"
 #include "webrtc/rtc_base/ifaddrs_converter.h"
 #include "webrtc/rtc_base/logging.h"

 #if !defined(WEBRTC_IOS)
 #include <net/if_media.h>
 #include <netinet/in_var.h>
 #else  // WEBRTC_IOS
 #define SCOPE6_ID_MAX 16

 struct in6_addrlifetime {
   time_t ia6t_expire;    /* valid lifetime expiration time */
   time_t ia6t_preferred; /* preferred lifetime expiration time */
   u_int32_t ia6t_vltime; /* valid lifetime */
   u_int32_t ia6t_pltime; /* prefix lifetime */
 };

 struct in6_ifstat {
   u_quad_t ifs6_in_receive;      /* # of total input datagram */
   u_quad_t ifs6_in_hdrerr;       /* # of datagrams with invalid hdr */
   u_quad_t ifs6_in_toobig;       /* # of datagrams exceeded MTU */
   u_quad_t ifs6_in_noroute;      /* # of datagrams with no route */
   u_quad_t ifs6_in_addrerr;      /* # of datagrams with invalid dst */
   u_quad_t ifs6_in_protounknown; /* # of datagrams with unknown proto */
                                  /* NOTE: increment on final dst if */
   u_quad_t ifs6_in_truncated;    /* # of truncated datagrams */
   u_quad_t ifs6_in_discard;      /* # of discarded datagrams */
                                  /* NOTE: fragment timeout is not here */
   u_quad_t ifs6_in_deliver;      /* # of datagrams delivered to ULP */
                                  /* NOTE: increment on final dst if */
   u_quad_t ifs6_out_forward;     /* # of datagrams forwarded */
                                  /* NOTE: increment on outgoing if */
   u_quad_t ifs6_out_request;     /* # of outgoing datagrams from ULP */
                                  /* NOTE: does not include forwrads */
   u_quad_t ifs6_out_discard;     /* # of discarded datagrams */
   u_quad_t ifs6_out_fragok;      /* # of datagrams fragmented */
   u_quad_t ifs6_out_fragfail;    /* # of datagrams failed on fragment */
   u_quad_t ifs6_out_fragcreat;   /* # of fragment datagrams */
                                  /* NOTE: this is # after fragment */
   u_quad_t ifs6_reass_reqd;      /* # of incoming fragmented packets */
                                  /* NOTE: increment on final dst if */
   u_quad_t ifs6_reass_ok;        /* # of reassembled packets */
                                  /* NOTE: this is # after reass */
                                  /* NOTE: increment on final dst if */
   u_quad_t ifs6_reass_fail;      /* # of reass failures */
                                  /* NOTE: may not be packet count */
                                  /* NOTE: increment on final dst if */
   u_quad_t ifs6_in_mcast;        /* # of inbound multicast datagrams */
   u_quad_t ifs6_out_mcast;       /* # of outbound multicast datagrams */
 };
 struct icmp6_ifstat {
   /*
    * Input statistics
    */
   /* ipv6IfIcmpInMsgs, total # of input messages */
   u_quad_t ifs6_in_msg;
   /* ipv6IfIcmpInErrors, # of input error messages */
   u_quad_t ifs6_in_error;
   /* ipv6IfIcmpInDestUnreachs, # of input dest unreach errors */
   u_quad_t ifs6_in_dstunreach;
   /* ipv6IfIcmpInAdminProhibs, # of input admin. prohibited errs */
   u_quad_t ifs6_in_adminprohib;
   /* ipv6IfIcmpInTimeExcds, # of input time exceeded errors */
   u_quad_t ifs6_in_timeexceed;
   /* ipv6IfIcmpInParmProblems, # of input parameter problem errors */
   u_quad_t ifs6_in_paramprob;
   /* ipv6IfIcmpInPktTooBigs, # of input packet too big errors */
   u_quad_t ifs6_in_pkttoobig;
   /* ipv6IfIcmpInEchos, # of input echo requests */
   u_quad_t ifs6_in_echo;
   /* ipv6IfIcmpInEchoReplies, # of input echo replies */
   u_quad_t ifs6_in_echoreply;
   /* ipv6IfIcmpInRouterSolicits, # of input router solicitations */
   u_quad_t ifs6_in_routersolicit;
   /* ipv6IfIcmpInRouterAdvertisements, # of input router advertisements */
   u_quad_t ifs6_in_routeradvert;
   /* ipv6IfIcmpInNeighborSolicits, # of input neighbor solicitations */
   u_quad_t ifs6_in_neighborsolicit;
   /* ipv6IfIcmpInNeighborAdvertisements, # of input neighbor advs. */
   u_quad_t ifs6_in_neighboradvert;
   /* ipv6IfIcmpInRedirects, # of input redirects */
   u_quad_t ifs6_in_redirect;
   /* ipv6IfIcmpInGroupMembQueries, # of input MLD queries */
   u_quad_t ifs6_in_mldquery;
   /* ipv6IfIcmpInGroupMembResponses, # of input MLD reports */
   u_quad_t ifs6_in_mldreport;
   /* ipv6IfIcmpInGroupMembReductions, # of input MLD done */
   u_quad_t ifs6_in_mlddone;

   /*
    * Output statistics. We should solve unresolved routing problem...
    */
   /* ipv6IfIcmpOutMsgs, total # of output messages */
   u_quad_t ifs6_out_msg;
   /* ipv6IfIcmpOutErrors, # of output error messages */
   u_quad_t ifs6_out_error;
   /* ipv6IfIcmpOutDestUnreachs, # of output dest unreach errors */
   u_quad_t ifs6_out_dstunreach;
   /* ipv6IfIcmpOutAdminProhibs, # of output admin. prohibited errs */
   u_quad_t ifs6_out_adminprohib;
   /* ipv6IfIcmpOutTimeExcds, # of output time exceeded errors */
   u_quad_t ifs6_out_timeexceed;
   /* ipv6IfIcmpOutParmProblems, # of output parameter problem errors */
   u_quad_t ifs6_out_paramprob;
   /* ipv6IfIcmpOutPktTooBigs, # of output packet too big errors */
   u_quad_t ifs6_out_pkttoobig;
   /* ipv6IfIcmpOutEchos, # of output echo requests */
   u_quad_t ifs6_out_echo;
   /* ipv6IfIcmpOutEchoReplies, # of output echo replies */
   u_quad_t ifs6_out_echoreply;
   /* ipv6IfIcmpOutRouterSolicits, # of output router solicitations */
   u_quad_t ifs6_out_routersolicit;
   /* ipv6IfIcmpOutRouterAdvertisements, # of output router advs. */
   u_quad_t ifs6_out_routeradvert;
   /* ipv6IfIcmpOutNeighborSolicits, # of output neighbor solicitations */
   u_quad_t ifs6_out_neighborsolicit;
   /* ipv6IfIcmpOutNeighborAdvertisements, # of output neighbor advs. */
   u_quad_t ifs6_out_neighboradvert;
   /* ipv6IfIcmpOutRedirects, # of output redirects */
   u_quad_t ifs6_out_redirect;
   /* ipv6IfIcmpOutGroupMembQueries, # of output MLD queries */
   u_quad_t ifs6_out_mldquery;
   /* ipv6IfIcmpOutGroupMembResponses, # of output MLD reports */
   u_quad_t ifs6_out_mldreport;
   /* ipv6IfIcmpOutGroupMembReductions, # of output MLD done */
   u_quad_t ifs6_out_mlddone;
 };

 struct in6_ifreq {
   char ifr_name[IFNAMSIZ];
   union {
     struct sockaddr_in6 ifru_addr;
     struct sockaddr_in6 ifru_dstaddr;
     int ifru_flags;
     int ifru_flags6;
     int ifru_metric;
     int ifru_intval;
     caddr_t ifru_data;
     struct in6_addrlifetime ifru_lifetime;
     struct in6_ifstat ifru_stat;
     struct icmp6_ifstat ifru_icmp6stat;
     u_int32_t ifru_scope_id[SCOPE6_ID_MAX];
   } ifr_ifru;
 };

 #define SIOCGIFAFLAG_IN6 _IOWR('i', 73, struct in6_ifreq)

 #define IN6_IFF_ANYCAST 0x0001    /* anycast address */
 #define IN6_IFF_TENTATIVE 0x0002  /* tentative address */
 #define IN6_IFF_DUPLICATED 0x0004 /* DAD detected duplicate */
 #define IN6_IFF_DETACHED 0x0008   /* may be detached from the link */
 #define IN6_IFF_DEPRECATED 0x0010 /* deprecated address */
 #define IN6_IFF_TEMPORARY 0x0080  /* temporary (anonymous) address. */

 #endif  // WEBRTC_IOS

 namespace rtc {

 namespace {

 class IPv6AttributesGetter {
  public:
   IPv6AttributesGetter();
   virtual ~IPv6AttributesGetter();
   bool IsInitialized() const;
   bool GetIPAttributes(const char* ifname,
                        const sockaddr* sock_addr,
                        int* native_attributes);

  private:
   // on MAC or IOS, we have to use ioctl with a socket to query an IPv6
   // interface's attribute.
   int ioctl_socket_;
 };

 IPv6AttributesGetter::IPv6AttributesGetter()
     : ioctl_socket_(
           socket(AF_INET6, SOCK_DGRAM, 0 /* unspecified protocol */)) {
   RTC_DCHECK_GE(ioctl_socket_, 0);
 }

 bool IPv6AttributesGetter::IsInitialized() const {
   return ioctl_socket_ >= 0;
 }

 IPv6AttributesGetter::~IPv6AttributesGetter() {
   if (!IsInitialized()) {
     return;
   }
   close(ioctl_socket_);
 }

 bool IPv6AttributesGetter::GetIPAttributes(const char* ifname,
                                            const sockaddr* sock_addr,
                                            int* native_attributes) {
   if (!IsInitialized()) {
     return false;
   }

   struct in6_ifreq ifr = {};
   strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name) - 1);
   memcpy(&ifr.ifr_ifru.ifru_addr, sock_addr, sock_addr->sa_len);
   int rv = ioctl(ioctl_socket_, SIOCGIFAFLAG_IN6, &ifr);
   if (rv >= 0) {
     *native_attributes = ifr.ifr_ifru.ifru_flags;
   } else {
     LOG(LS_ERROR) << "ioctl returns " << errno;
   }
   return (rv >= 0);
 }

 // Converts native IPv6 address attributes to net IPv6 address attributes.  If
 // it returns false, the IP address isn't suitable for one-to-one communications
 // applications and should be ignored.
 bool ConvertNativeToIPAttributes(int native_attributes, int* net_attributes) {
   // For MacOSX, we disallow addresses with attributes IN6_IFF_ANYCASE,
   // IN6_IFF_DUPLICATED, IN6_IFF_TENTATIVE, and IN6_IFF_DETACHED as these are
   // still progressing through duplicated address detection (DAD) or are not
   // suitable for one-to-one communication applications.
   if (native_attributes & (IN6_IFF_ANYCAST | IN6_IFF_DUPLICATED |
                            IN6_IFF_TENTATIVE | IN6_IFF_DETACHED)) {
     return false;
   }

   if (native_attributes & IN6_IFF_TEMPORARY) {
     *net_attributes |= IPV6_ADDRESS_FLAG_TEMPORARY;
   }

   if (native_attributes & IN6_IFF_DEPRECATED) {
     *net_attributes |= IPV6_ADDRESS_FLAG_DEPRECATED;
   }

   return true;
 }

 class MacIfAddrsConverter : public IfAddrsConverter {
  public:
   MacIfAddrsConverter() : ip_attribute_getter_(new IPv6AttributesGetter()) {}
   ~MacIfAddrsConverter() override {}

   bool ConvertNativeAttributesToIPAttributes(const struct ifaddrs* interface,
                                              int* ip_attributes) override {
     int native_attributes;
     if (!ip_attribute_getter_->GetIPAttributes(
             interface->ifa_name, interface->ifa_addr, &native_attributes)) {
       return false;
     }

     if (!ConvertNativeToIPAttributes(native_attributes, ip_attributes)) {
       return false;
     }

     return true;
   }

  private:
   std::unique_ptr<IPv6AttributesGetter> ip_attribute_getter_;
 };

 }  // namespace

 IfAddrsConverter* CreateIfAddrsConverter() {
   return new MacIfAddrsConverter();
 }

 }  // namespace rtc
	/*
	* Copyright 2015 The WebRTC Project Authors. All rights reserved.
	*
	* Use of this source code is governed by a BSD-style license
	* that can be found in the LICENSE file in the root of the source
	* tree. An additional intellectual property rights grant can be found
	* in the file PATENTS. All contributing project authors may
	* be found in the AUTHORS file in the root of the source tree.
	*/

	#include <memory>

	#include <net/if.h>
	#include <sys/ioctl.h>
	#include <unistd.h>

	#include "webrtc/rtc_base/checks.h"
	#include "webrtc/rtc_base/ifaddrs_converter.h"
	#include "webrtc/rtc_base/logging.h"

	#if !defined(WEBRTC_IOS)
	#include <net/if_media.h>
	#include <netinet/in_var.h>
	#else // WEBRTC_IOS
	#define SCOPE6_ID_MAX 16

	struct in6_addrlifetime {
	time_t ia6t_expire; /* valid lifetime expiration time */
	time_t ia6t_preferred; /* preferred lifetime expiration time */
	u_int32_t ia6t_vltime; /* valid lifetime */
	u_int32_t ia6t_pltime; /* prefix lifetime */
	};

	struct in6_ifstat {
	u_quad_t ifs6_in_receive; /* # of total input datagram */
	u_quad_t ifs6_in_hdrerr; /* # of datagrams with invalid hdr */
	u_quad_t ifs6_in_toobig; /* # of datagrams exceeded MTU */
	u_quad_t ifs6_in_noroute; /* # of datagrams with no route */
	u_quad_t ifs6_in_addrerr; /* # of datagrams with invalid dst */
	u_quad_t ifs6_in_protounknown; /* # of datagrams with unknown proto */
	/* NOTE: increment on final dst if */
	u_quad_t ifs6_in_truncated; /* # of truncated datagrams */
	u_quad_t ifs6_in_discard; /* # of discarded datagrams */
	/* NOTE: fragment timeout is not here */
	u_quad_t ifs6_in_deliver; /* # of datagrams delivered to ULP */
	/* NOTE: increment on final dst if */
	u_quad_t ifs6_out_forward; /* # of datagrams forwarded */
	/* NOTE: increment on outgoing if */
	u_quad_t ifs6_out_request; /* # of outgoing datagrams from ULP */
	/* NOTE: does not include forwrads */
	u_quad_t ifs6_out_discard; /* # of discarded datagrams */
	u_quad_t ifs6_out_fragok; /* # of datagrams fragmented */
	u_quad_t ifs6_out_fragfail; /* # of datagrams failed on fragment */
	u_quad_t ifs6_out_fragcreat; /* # of fragment datagrams */
	/* NOTE: this is # after fragment */
	u_quad_t ifs6_reass_reqd; /* # of incoming fragmented packets */
	/* NOTE: increment on final dst if */
	u_quad_t ifs6_reass_ok; /* # of reassembled packets */
	/* NOTE: this is # after reass */
	/* NOTE: increment on final dst if */
	u_quad_t ifs6_reass_fail; /* # of reass failures */
	/* NOTE: may not be packet count */
	/* NOTE: increment on final dst if */
	u_quad_t ifs6_in_mcast; /* # of inbound multicast datagrams */
	u_quad_t ifs6_out_mcast; /* # of outbound multicast datagrams */
	};
	struct icmp6_ifstat {
	/*
	* Input statistics
	*/
	/* ipv6IfIcmpInMsgs, total # of input messages */
	u_quad_t ifs6_in_msg;
	/* ipv6IfIcmpInErrors, # of input error messages */
	u_quad_t ifs6_in_error;
	/* ipv6IfIcmpInDestUnreachs, # of input dest unreach errors */
	u_quad_t ifs6_in_dstunreach;
	/* ipv6IfIcmpInAdminProhibs, # of input admin. prohibited errs */
	u_quad_t ifs6_in_adminprohib;
	/* ipv6IfIcmpInTimeExcds, # of input time exceeded errors */
	u_quad_t ifs6_in_timeexceed;
	/* ipv6IfIcmpInParmProblems, # of input parameter problem errors */
	u_quad_t ifs6_in_paramprob;
	/* ipv6IfIcmpInPktTooBigs, # of input packet too big errors */
	u_quad_t ifs6_in_pkttoobig;
	/* ipv6IfIcmpInEchos, # of input echo requests */
	u_quad_t ifs6_in_echo;
	/* ipv6IfIcmpInEchoReplies, # of input echo replies */
	u_quad_t ifs6_in_echoreply;
	/* ipv6IfIcmpInRouterSolicits, # of input router solicitations */
	u_quad_t ifs6_in_routersolicit;
	/* ipv6IfIcmpInRouterAdvertisements, # of input router advertisements */
	u_quad_t ifs6_in_routeradvert;
	/* ipv6IfIcmpInNeighborSolicits, # of input neighbor solicitations */
	u_quad_t ifs6_in_neighborsolicit;
	/* ipv6IfIcmpInNeighborAdvertisements, # of input neighbor advs. */
	u_quad_t ifs6_in_neighboradvert;
	/* ipv6IfIcmpInRedirects, # of input redirects */
	u_quad_t ifs6_in_redirect;
	/* ipv6IfIcmpInGroupMembQueries, # of input MLD queries */
	u_quad_t ifs6_in_mldquery;
	/* ipv6IfIcmpInGroupMembResponses, # of input MLD reports */
	u_quad_t ifs6_in_mldreport;
	/* ipv6IfIcmpInGroupMembReductions, # of input MLD done */
	u_quad_t ifs6_in_mlddone;

	/*
	* Output statistics. We should solve unresolved routing problem...
	*/
	/* ipv6IfIcmpOutMsgs, total # of output messages */
	u_quad_t ifs6_out_msg;
	/* ipv6IfIcmpOutErrors, # of output error messages */
	u_quad_t ifs6_out_error;
	/* ipv6IfIcmpOutDestUnreachs, # of output dest unreach errors */
	u_quad_t ifs6_out_dstunreach;
	/* ipv6IfIcmpOutAdminProhibs, # of output admin. prohibited errs */
	u_quad_t ifs6_out_adminprohib;
	/* ipv6IfIcmpOutTimeExcds, # of output time exceeded errors */
	u_quad_t ifs6_out_timeexceed;
	/* ipv6IfIcmpOutParmProblems, # of output parameter problem errors */
	u_quad_t ifs6_out_paramprob;
	/* ipv6IfIcmpOutPktTooBigs, # of output packet too big errors */
	u_quad_t ifs6_out_pkttoobig;
	/* ipv6IfIcmpOutEchos, # of output echo requests */
	u_quad_t ifs6_out_echo;
	/* ipv6IfIcmpOutEchoReplies, # of output echo replies */
	u_quad_t ifs6_out_echoreply;
	/* ipv6IfIcmpOutRouterSolicits, # of output router solicitations */
	u_quad_t ifs6_out_routersolicit;
	/* ipv6IfIcmpOutRouterAdvertisements, # of output router advs. */
	u_quad_t ifs6_out_routeradvert;
	/* ipv6IfIcmpOutNeighborSolicits, # of output neighbor solicitations */
	u_quad_t ifs6_out_neighborsolicit;
	/* ipv6IfIcmpOutNeighborAdvertisements, # of output neighbor advs. */
	u_quad_t ifs6_out_neighboradvert;
	/* ipv6IfIcmpOutRedirects, # of output redirects */
	u_quad_t ifs6_out_redirect;
	/* ipv6IfIcmpOutGroupMembQueries, # of output MLD queries */
	u_quad_t ifs6_out_mldquery;
	/* ipv6IfIcmpOutGroupMembResponses, # of output MLD reports */
	u_quad_t ifs6_out_mldreport;
	/* ipv6IfIcmpOutGroupMembReductions, # of output MLD done */
	u_quad_t ifs6_out_mlddone;
	};

	struct in6_ifreq {
	char ifr_name[IFNAMSIZ];
	union {
	struct sockaddr_in6 ifru_addr;
	struct sockaddr_in6 ifru_dstaddr;
	int ifru_flags;
	int ifru_flags6;
	int ifru_metric;
	int ifru_intval;
	caddr_t ifru_data;
	struct in6_addrlifetime ifru_lifetime;
	struct in6_ifstat ifru_stat;
	struct icmp6_ifstat ifru_icmp6stat;
	u_int32_t ifru_scope_id[SCOPE6_ID_MAX];
	} ifr_ifru;
	};

	#define SIOCGIFAFLAG_IN6 _IOWR('i', 73, struct in6_ifreq)

	#define IN6_IFF_ANYCAST 0x0001 /* anycast address */
	#define IN6_IFF_TENTATIVE 0x0002 /* tentative address */
	#define IN6_IFF_DUPLICATED 0x0004 /* DAD detected duplicate */
	#define IN6_IFF_DETACHED 0x0008 /* may be detached from the link */
	#define IN6_IFF_DEPRECATED 0x0010 /* deprecated address */
	#define IN6_IFF_TEMPORARY 0x0080 /* temporary (anonymous) address. */

	#endif // WEBRTC_IOS

	namespace rtc {

	namespace {

	class IPv6AttributesGetter {
	public:
	IPv6AttributesGetter();
	virtual ~IPv6AttributesGetter();
	bool IsInitialized() const;
	bool GetIPAttributes(const char* ifname,
	const sockaddr* sock_addr,
	int* native_attributes);

	private:
	// on MAC or IOS, we have to use ioctl with a socket to query an IPv6
	// interface's attribute.
	int ioctl_socket_;
	};

	IPv6AttributesGetter::IPv6AttributesGetter()
	: ioctl_socket_(
	socket(AF_INET6, SOCK_DGRAM, 0 /* unspecified protocol */)) {
	RTC_DCHECK_GE(ioctl_socket_, 0);
	}

	bool IPv6AttributesGetter::IsInitialized() const {
	return ioctl_socket_ >= 0;
	}

	IPv6AttributesGetter::~IPv6AttributesGetter() {
	if (!IsInitialized()) {
	return;
	}
	close(ioctl_socket_);
	}

	bool IPv6AttributesGetter::GetIPAttributes(const char* ifname,
	const sockaddr* sock_addr,
	int* native_attributes) {
	if (!IsInitialized()) {
	return false;
	}

	struct in6_ifreq ifr = {};
	strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name) - 1);
	memcpy(&ifr.ifr_ifru.ifru_addr, sock_addr, sock_addr->sa_len);
	int rv = ioctl(ioctl_socket_, SIOCGIFAFLAG_IN6, &ifr);
	if (rv >= 0) {
	*native_attributes = ifr.ifr_ifru.ifru_flags;
	} else {
	LOG(LS_ERROR) << "ioctl returns " << errno;
	}
	return (rv >= 0);
	}

	// Converts native IPv6 address attributes to net IPv6 address attributes. If
	// it returns false, the IP address isn't suitable for one-to-one communications
	// applications and should be ignored.
	bool ConvertNativeToIPAttributes(int native_attributes, int* net_attributes) {
	// For MacOSX, we disallow addresses with attributes IN6_IFF_ANYCASE,
	// IN6_IFF_DUPLICATED, IN6_IFF_TENTATIVE, and IN6_IFF_DETACHED as these are
	// still progressing through duplicated address detection (DAD) or are not
	// suitable for one-to-one communication applications.
	if (native_attributes & (IN6_IFF_ANYCAST \| IN6_IFF_DUPLICATED \|
	IN6_IFF_TENTATIVE \| IN6_IFF_DETACHED)) {
	return false;
	}

	if (native_attributes & IN6_IFF_TEMPORARY) {
	*net_attributes \|= IPV6_ADDRESS_FLAG_TEMPORARY;
	}

	if (native_attributes & IN6_IFF_DEPRECATED) {
	*net_attributes \|= IPV6_ADDRESS_FLAG_DEPRECATED;
	}

	return true;
	}

	class MacIfAddrsConverter : public IfAddrsConverter {
	public:
	MacIfAddrsConverter() : ip_attribute_getter_(new IPv6AttributesGetter()) {}
	~MacIfAddrsConverter() override {}

	bool ConvertNativeAttributesToIPAttributes(const struct ifaddrs* interface,
	int* ip_attributes) override {
	int native_attributes;
	if (!ip_attribute_getter_->GetIPAttributes(
	interface->ifa_name, interface->ifa_addr, &native_attributes)) {
	return false;
	}

	if (!ConvertNativeToIPAttributes(native_attributes, ip_attributes)) {
	return false;
	}

	return true;
	}

	private:
	std::unique_ptr<IPv6AttributesGetter> ip_attribute_getter_;
	};

	} // namespace

	IfAddrsConverter* CreateIfAddrsConverter() {
	return new MacIfAddrsConverter();
	}

	} // namespace rtc