1 /*
2 * Copyright 2015 The WebRTC Project Authors. All rights reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include <net/if.h>
12 #include <sys/ioctl.h>
13 #include <unistd.h>
14
15 #include <memory>
16
17 #include "rtc_base/checks.h"
18 #include "rtc_base/ifaddrs_converter.h"
19 #include "rtc_base/logging.h"
20
21 #if !defined(WEBRTC_IOS)
22 #include <net/if_media.h>
23 #include <netinet/in_var.h>
24 #else // WEBRTC_IOS
25 #define SCOPE6_ID_MAX 16
26
27 struct in6_addrlifetime {
28 time_t ia6t_expire; /* valid lifetime expiration time */
29 time_t ia6t_preferred; /* preferred lifetime expiration time */
30 u_int32_t ia6t_vltime; /* valid lifetime */
31 u_int32_t ia6t_pltime; /* prefix lifetime */
32 };
33
34 struct in6_ifstat {
35 u_quad_t ifs6_in_receive; /* # of total input datagram */
36 u_quad_t ifs6_in_hdrerr; /* # of datagrams with invalid hdr */
37 u_quad_t ifs6_in_toobig; /* # of datagrams exceeded MTU */
38 u_quad_t ifs6_in_noroute; /* # of datagrams with no route */
39 u_quad_t ifs6_in_addrerr; /* # of datagrams with invalid dst */
40 u_quad_t ifs6_in_protounknown; /* # of datagrams with unknown proto */
41 /* NOTE: increment on final dst if */
42 u_quad_t ifs6_in_truncated; /* # of truncated datagrams */
43 u_quad_t ifs6_in_discard; /* # of discarded datagrams */
44 /* NOTE: fragment timeout is not here */
45 u_quad_t ifs6_in_deliver; /* # of datagrams delivered to ULP */
46 /* NOTE: increment on final dst if */
47 u_quad_t ifs6_out_forward; /* # of datagrams forwarded */
48 /* NOTE: increment on outgoing if */
49 u_quad_t ifs6_out_request; /* # of outgoing datagrams from ULP */
50 /* NOTE: does not include forwrads */
51 u_quad_t ifs6_out_discard; /* # of discarded datagrams */
52 u_quad_t ifs6_out_fragok; /* # of datagrams fragmented */
53 u_quad_t ifs6_out_fragfail; /* # of datagrams failed on fragment */
54 u_quad_t ifs6_out_fragcreat; /* # of fragment datagrams */
55 /* NOTE: this is # after fragment */
56 u_quad_t ifs6_reass_reqd; /* # of incoming fragmented packets */
57 /* NOTE: increment on final dst if */
58 u_quad_t ifs6_reass_ok; /* # of reassembled packets */
59 /* NOTE: this is # after reass */
60 /* NOTE: increment on final dst if */
61 u_quad_t ifs6_reass_fail; /* # of reass failures */
62 /* NOTE: may not be packet count */
63 /* NOTE: increment on final dst if */
64 u_quad_t ifs6_in_mcast; /* # of inbound multicast datagrams */
65 u_quad_t ifs6_out_mcast; /* # of outbound multicast datagrams */
66 };
67 struct icmp6_ifstat {
68 /*
69 * Input statistics
70 */
71 /* ipv6IfIcmpInMsgs, total # of input messages */
72 u_quad_t ifs6_in_msg;
73 /* ipv6IfIcmpInErrors, # of input error messages */
74 u_quad_t ifs6_in_error;
75 /* ipv6IfIcmpInDestUnreachs, # of input dest unreach errors */
76 u_quad_t ifs6_in_dstunreach;
77 /* ipv6IfIcmpInAdminProhibs, # of input admin. prohibited errs */
78 u_quad_t ifs6_in_adminprohib;
79 /* ipv6IfIcmpInTimeExcds, # of input time exceeded errors */
80 u_quad_t ifs6_in_timeexceed;
81 /* ipv6IfIcmpInParmProblems, # of input parameter problem errors */
82 u_quad_t ifs6_in_paramprob;
83 /* ipv6IfIcmpInPktTooBigs, # of input packet too big errors */
84 u_quad_t ifs6_in_pkttoobig;
85 /* ipv6IfIcmpInEchos, # of input echo requests */
86 u_quad_t ifs6_in_echo;
87 /* ipv6IfIcmpInEchoReplies, # of input echo replies */
88 u_quad_t ifs6_in_echoreply;
89 /* ipv6IfIcmpInRouterSolicits, # of input router solicitations */
90 u_quad_t ifs6_in_routersolicit;
91 /* ipv6IfIcmpInRouterAdvertisements, # of input router advertisements */
92 u_quad_t ifs6_in_routeradvert;
93 /* ipv6IfIcmpInNeighborSolicits, # of input neighbor solicitations */
94 u_quad_t ifs6_in_neighborsolicit;
95 /* ipv6IfIcmpInNeighborAdvertisements, # of input neighbor advs. */
96 u_quad_t ifs6_in_neighboradvert;
97 /* ipv6IfIcmpInRedirects, # of input redirects */
98 u_quad_t ifs6_in_redirect;
99 /* ipv6IfIcmpInGroupMembQueries, # of input MLD queries */
100 u_quad_t ifs6_in_mldquery;
101 /* ipv6IfIcmpInGroupMembResponses, # of input MLD reports */
102 u_quad_t ifs6_in_mldreport;
103 /* ipv6IfIcmpInGroupMembReductions, # of input MLD done */
104 u_quad_t ifs6_in_mlddone;
105
106 /*
107 * Output statistics. We should solve unresolved routing problem...
108 */
109 /* ipv6IfIcmpOutMsgs, total # of output messages */
110 u_quad_t ifs6_out_msg;
111 /* ipv6IfIcmpOutErrors, # of output error messages */
112 u_quad_t ifs6_out_error;
113 /* ipv6IfIcmpOutDestUnreachs, # of output dest unreach errors */
114 u_quad_t ifs6_out_dstunreach;
115 /* ipv6IfIcmpOutAdminProhibs, # of output admin. prohibited errs */
116 u_quad_t ifs6_out_adminprohib;
117 /* ipv6IfIcmpOutTimeExcds, # of output time exceeded errors */
118 u_quad_t ifs6_out_timeexceed;
119 /* ipv6IfIcmpOutParmProblems, # of output parameter problem errors */
120 u_quad_t ifs6_out_paramprob;
121 /* ipv6IfIcmpOutPktTooBigs, # of output packet too big errors */
122 u_quad_t ifs6_out_pkttoobig;
123 /* ipv6IfIcmpOutEchos, # of output echo requests */
124 u_quad_t ifs6_out_echo;
125 /* ipv6IfIcmpOutEchoReplies, # of output echo replies */
126 u_quad_t ifs6_out_echoreply;
127 /* ipv6IfIcmpOutRouterSolicits, # of output router solicitations */
128 u_quad_t ifs6_out_routersolicit;
129 /* ipv6IfIcmpOutRouterAdvertisements, # of output router advs. */
130 u_quad_t ifs6_out_routeradvert;
131 /* ipv6IfIcmpOutNeighborSolicits, # of output neighbor solicitations */
132 u_quad_t ifs6_out_neighborsolicit;
133 /* ipv6IfIcmpOutNeighborAdvertisements, # of output neighbor advs. */
134 u_quad_t ifs6_out_neighboradvert;
135 /* ipv6IfIcmpOutRedirects, # of output redirects */
136 u_quad_t ifs6_out_redirect;
137 /* ipv6IfIcmpOutGroupMembQueries, # of output MLD queries */
138 u_quad_t ifs6_out_mldquery;
139 /* ipv6IfIcmpOutGroupMembResponses, # of output MLD reports */
140 u_quad_t ifs6_out_mldreport;
141 /* ipv6IfIcmpOutGroupMembReductions, # of output MLD done */
142 u_quad_t ifs6_out_mlddone;
143 };
144
145 struct in6_ifreq {
146 char ifr_name[IFNAMSIZ];
147 union {
148 struct sockaddr_in6 ifru_addr;
149 struct sockaddr_in6 ifru_dstaddr;
150 int ifru_flags;
151 int ifru_flags6;
152 int ifru_metric;
153 int ifru_intval;
154 caddr_t ifru_data;
155 struct in6_addrlifetime ifru_lifetime;
156 struct in6_ifstat ifru_stat;
157 struct icmp6_ifstat ifru_icmp6stat;
158 u_int32_t ifru_scope_id[SCOPE6_ID_MAX];
159 } ifr_ifru;
160 };
161
162 #define SIOCGIFAFLAG_IN6 _IOWR('i', 73, struct in6_ifreq)
163
164 #define IN6_IFF_ANYCAST 0x0001 /* anycast address */
165 #define IN6_IFF_TENTATIVE 0x0002 /* tentative address */
166 #define IN6_IFF_DUPLICATED 0x0004 /* DAD detected duplicate */
167 #define IN6_IFF_DETACHED 0x0008 /* may be detached from the link */
168 #define IN6_IFF_DEPRECATED 0x0010 /* deprecated address */
169 #define IN6_IFF_TEMPORARY 0x0080 /* temporary (anonymous) address. */
170
171 #endif // WEBRTC_IOS
172
173 namespace rtc {
174
175 namespace {
176
177 class IPv6AttributesGetter {
178 public:
179 IPv6AttributesGetter();
180 virtual ~IPv6AttributesGetter();
181 bool IsInitialized() const;
182 bool GetIPAttributes(const char* ifname,
183 const sockaddr* sock_addr,
184 int* native_attributes);
185
186 private:
187 // on MAC or IOS, we have to use ioctl with a socket to query an IPv6
188 // interface's attribute.
189 int ioctl_socket_;
190 };
191
IPv6AttributesGetter()192 IPv6AttributesGetter::IPv6AttributesGetter()
193 : ioctl_socket_(
194 socket(AF_INET6, SOCK_DGRAM, 0 /* unspecified protocol */)) {
195 RTC_DCHECK_GE(ioctl_socket_, 0);
196 }
197
IsInitialized() const198 bool IPv6AttributesGetter::IsInitialized() const {
199 return ioctl_socket_ >= 0;
200 }
201
~IPv6AttributesGetter()202 IPv6AttributesGetter::~IPv6AttributesGetter() {
203 if (!IsInitialized()) {
204 return;
205 }
206 close(ioctl_socket_);
207 }
208
GetIPAttributes(const char * ifname,const sockaddr * sock_addr,int * native_attributes)209 bool IPv6AttributesGetter::GetIPAttributes(const char* ifname,
210 const sockaddr* sock_addr,
211 int* native_attributes) {
212 if (!IsInitialized()) {
213 return false;
214 }
215
216 struct in6_ifreq ifr = {};
217 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name) - 1);
218 memcpy(&ifr.ifr_ifru.ifru_addr, sock_addr, sock_addr->sa_len);
219 int rv = ioctl(ioctl_socket_, SIOCGIFAFLAG_IN6, &ifr);
220 if (rv >= 0) {
221 *native_attributes = ifr.ifr_ifru.ifru_flags;
222 } else {
223 RTC_LOG(LS_ERROR) << "ioctl returns " << errno;
224 }
225 return (rv >= 0);
226 }
227
228 // Converts native IPv6 address attributes to net IPv6 address attributes. If
229 // it returns false, the IP address isn't suitable for one-to-one communications
230 // applications and should be ignored.
ConvertNativeToIPAttributes(int native_attributes,int * net_attributes)231 bool ConvertNativeToIPAttributes(int native_attributes, int* net_attributes) {
232 // For MacOSX, we disallow addresses with attributes IN6_IFF_ANYCASE,
233 // IN6_IFF_DUPLICATED, IN6_IFF_TENTATIVE, and IN6_IFF_DETACHED as these are
234 // still progressing through duplicated address detection (DAD) or are not
235 // suitable for one-to-one communication applications.
236 if (native_attributes & (IN6_IFF_ANYCAST | IN6_IFF_DUPLICATED |
237 IN6_IFF_TENTATIVE | IN6_IFF_DETACHED)) {
238 return false;
239 }
240
241 if (native_attributes & IN6_IFF_TEMPORARY) {
242 *net_attributes |= IPV6_ADDRESS_FLAG_TEMPORARY;
243 }
244
245 if (native_attributes & IN6_IFF_DEPRECATED) {
246 *net_attributes |= IPV6_ADDRESS_FLAG_DEPRECATED;
247 }
248
249 return true;
250 }
251
252 class MacIfAddrsConverter : public IfAddrsConverter {
253 public:
MacIfAddrsConverter()254 MacIfAddrsConverter() : ip_attribute_getter_(new IPv6AttributesGetter()) {}
~MacIfAddrsConverter()255 ~MacIfAddrsConverter() override {}
256
ConvertNativeAttributesToIPAttributes(const struct ifaddrs * interface,int * ip_attributes)257 bool ConvertNativeAttributesToIPAttributes(const struct ifaddrs* interface,
258 int* ip_attributes) override {
259 int native_attributes;
260 if (!ip_attribute_getter_->GetIPAttributes(
261 interface->ifa_name, interface->ifa_addr, &native_attributes)) {
262 return false;
263 }
264
265 if (!ConvertNativeToIPAttributes(native_attributes, ip_attributes)) {
266 return false;
267 }
268
269 return true;
270 }
271
272 private:
273 std::unique_ptr<IPv6AttributesGetter> ip_attribute_getter_;
274 };
275
276 } // namespace
277
CreateIfAddrsConverter()278 IfAddrsConverter* CreateIfAddrsConverter() {
279 return new MacIfAddrsConverter();
280 }
281
282 } // namespace rtc
283