1 /* getifaddrs -- get names and addresses of all network interfaces
2 Copyright (C) 2003-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
24 #include <netinet/in.h>
25 #include <netpacket/packet.h>
30 #include <sys/ioctl.h>
31 #include <sys/socket.h>
36 #include "netlinkaccess.h"
39 /* There is a problem with this type. The address length for
40 Infiniband sockets is much longer than the 8 bytes allocated in the
41 sockaddr_ll definition. Hence we use here a special
43 struct sockaddr_ll_max
45 unsigned short int sll_family
;
46 unsigned short int sll_protocol
;
48 unsigned short int sll_hatype
;
49 unsigned char sll_pkttype
;
50 unsigned char sll_halen
;
51 unsigned char sll_addr
[24];
55 /* struct to hold the data for one ifaddrs entry, so we can allocate
56 everything at once. */
57 struct ifaddrs_storage
62 /* Save space for the biggest of the four used sockaddr types and
63 avoid a lot of casts. */
65 struct sockaddr_ll_max sl
;
66 struct sockaddr_in s4
;
67 struct sockaddr_in6 s6
;
68 } addr
, netmask
, broadaddr
;
69 char name
[IF_NAMESIZE
+ 1];
74 __netlink_free_handle (struct netlink_handle
*h
)
76 struct netlink_res
*ptr
;
77 int saved_errno
= errno
;
82 struct netlink_res
*tmpptr
;
89 __set_errno (saved_errno
);
94 __netlink_sendreq (struct netlink_handle
*h
, int type
)
102 struct sockaddr_nl nladdr
;
105 h
->seq
= time_now ();
107 req
.nlh
.nlmsg_len
= sizeof (req
);
108 req
.nlh
.nlmsg_type
= type
;
109 req
.nlh
.nlmsg_flags
= NLM_F_ROOT
| NLM_F_MATCH
| NLM_F_REQUEST
;
110 req
.nlh
.nlmsg_pid
= 0;
111 req
.nlh
.nlmsg_seq
= h
->seq
;
112 req
.g
.rtgen_family
= AF_UNSPEC
;
113 if (sizeof (req
) != offsetof (struct req
, pad
))
114 memset (req
.pad
, '\0', sizeof (req
) - offsetof (struct req
, pad
));
116 memset (&nladdr
, '\0', sizeof (nladdr
));
117 nladdr
.nl_family
= AF_NETLINK
;
119 return TEMP_FAILURE_RETRY (__sendto (h
->fd
, (void *) &req
, sizeof (req
), 0,
120 (struct sockaddr
*) &nladdr
,
126 __netlink_request (struct netlink_handle
*h
, int type
)
128 struct netlink_res
*nlm_next
;
129 struct sockaddr_nl nladdr
;
130 struct nlmsghdr
*nlmh
;
135 /* Help the compiler optimize out the malloc call if PAGE_SIZE
136 is constant and smaller or equal to PTHREAD_STACK_MIN/4. */
137 const size_t buf_size
= PAGE_SIZE
;
139 const size_t buf_size
= __getpagesize ();
141 bool use_malloc
= false;
144 if (__libc_use_alloca (buf_size
))
145 buf
= alloca (buf_size
);
148 buf
= malloc (buf_size
);
155 struct iovec iov
= { buf
, buf_size
};
157 if (__netlink_sendreq (h
, type
) < 0)
164 .msg_name
= (void *) &nladdr
,
165 .msg_namelen
= sizeof (nladdr
),
173 read_len
= TEMP_FAILURE_RETRY (__recvmsg (h
->fd
, &msg
, 0));
174 __netlink_assert_response (h
->fd
, read_len
);
178 if (nladdr
.nl_pid
!= 0)
181 if (__glibc_unlikely (msg
.msg_flags
& MSG_TRUNC
))
185 size_t remaining_len
= read_len
;
186 for (nlmh
= (struct nlmsghdr
*) buf
;
187 NLMSG_OK (nlmh
, remaining_len
);
188 nlmh
= (struct nlmsghdr
*) NLMSG_NEXT (nlmh
, remaining_len
))
190 if ((pid_t
) nlmh
->nlmsg_pid
!= h
->pid
191 || nlmh
->nlmsg_seq
!= h
->seq
)
195 if (nlmh
->nlmsg_type
== NLMSG_DONE
)
197 /* We found the end, leave the loop. */
201 if (nlmh
->nlmsg_type
== NLMSG_ERROR
)
203 struct nlmsgerr
*nlerr
= (struct nlmsgerr
*) NLMSG_DATA (nlmh
);
204 if (nlmh
->nlmsg_len
< NLMSG_LENGTH (sizeof (struct nlmsgerr
)))
207 errno
= -nlerr
->error
;
212 /* If there was nothing with the expected nlmsg_pid and nlmsg_seq,
213 there is no point to record it. */
217 nlm_next
= (struct netlink_res
*) malloc (sizeof (struct netlink_res
)
219 if (nlm_next
== NULL
)
221 nlm_next
->next
= NULL
;
222 nlm_next
->nlh
= memcpy (nlm_next
+ 1, buf
, read_len
);
223 nlm_next
->size
= read_len
;
224 nlm_next
->seq
= h
->seq
;
225 if (h
->nlm_list
== NULL
)
226 h
->nlm_list
= nlm_next
;
228 h
->end_ptr
->next
= nlm_next
;
229 h
->end_ptr
= nlm_next
;
244 __netlink_close (struct netlink_handle
*h
)
246 /* Don't modify errno. */
247 INTERNAL_SYSCALL_CALL (close
, h
->fd
);
251 /* Open a NETLINK socket. */
253 __netlink_open (struct netlink_handle
*h
)
255 struct sockaddr_nl nladdr
;
257 h
->fd
= __socket (PF_NETLINK
, SOCK_RAW
| SOCK_CLOEXEC
, NETLINK_ROUTE
);
261 memset (&nladdr
, '\0', sizeof (nladdr
));
262 nladdr
.nl_family
= AF_NETLINK
;
263 if (__bind (h
->fd
, (struct sockaddr
*) &nladdr
, sizeof (nladdr
)) < 0)
270 /* Determine the ID the kernel assigned for this netlink connection.
271 It is not necessarily the PID if there is more than one socket
273 socklen_t addr_len
= sizeof (nladdr
);
274 if (__getsockname (h
->fd
, (struct sockaddr
*) &nladdr
, &addr_len
) < 0)
276 h
->pid
= nladdr
.nl_pid
;
281 /* We know the number of RTM_NEWLINK entries, so we reserve the first
282 # of entries for this type. All RTM_NEWADDR entries have an index
283 pointer to the RTM_NEWLINK entry. To find the entry, create
284 a table to map kernel index entries to our index numbers.
285 Since we get at first all RTM_NEWLINK entries, it can never happen
286 that a RTM_NEWADDR index is not known to this map. */
288 map_newlink (int index
, struct ifaddrs_storage
*ifas
, int *map
, int max
)
292 for (i
= 0; i
< max
; i
++)
298 ifas
[i
- 1].ifa
.ifa_next
= &ifas
[i
].ifa
;
301 else if (map
[i
] == index
)
305 /* This means interfaces changed between the reading of the
306 RTM_GETLINK and RTM_GETADDR information. We have to repeat
312 /* Create a linked list of `struct ifaddrs' structures, one for each
313 network interface on the host machine. If successful, store the
314 list in *IFAP and return 0. On errors, return -1 and set `errno'. */
316 getifaddrs_internal (struct ifaddrs
**ifap
)
318 struct netlink_handle nh
= { 0, 0, 0, NULL
, NULL
};
319 struct netlink_res
*nlp
;
320 struct ifaddrs_storage
*ifas
;
321 unsigned int i
, newlink
, newaddr
, newaddr_idx
;
322 int *map_newlink_data
;
323 size_t ifa_data_size
= 0; /* Size to allocate for all ifa_data. */
324 char *ifa_data_ptr
; /* Pointer to the unused part of memory for
330 if (__netlink_open (&nh
) < 0)
333 /* Tell the kernel that we wish to get a list of all
334 active interfaces, collect all data for every interface. */
335 if (__netlink_request (&nh
, RTM_GETLINK
) < 0)
341 /* Now ask the kernel for all addresses which are assigned
342 to an interface and collect all data for every interface.
343 Since we store the addresses after the interfaces in the
344 list, we will later always find the interface before the
345 corresponding addresses. */
347 if (__netlink_request (&nh
, RTM_GETADDR
) < 0)
353 /* Count all RTM_NEWLINK and RTM_NEWADDR entries to allocate
355 newlink
= newaddr
= 0;
356 for (nlp
= nh
.nlm_list
; nlp
; nlp
= nlp
->next
)
358 struct nlmsghdr
*nlh
;
359 size_t size
= nlp
->size
;
361 if (nlp
->nlh
== NULL
)
364 /* Walk through all entries we got from the kernel and look, which
365 message type they contain. */
366 for (nlh
= nlp
->nlh
; NLMSG_OK (nlh
, size
); nlh
= NLMSG_NEXT (nlh
, size
))
368 /* Check if the message is what we want. */
369 if ((pid_t
) nlh
->nlmsg_pid
!= nh
.pid
|| nlh
->nlmsg_seq
!= nlp
->seq
)
372 /* If the dump got interrupted, we can't rely on the results
374 if (nlh
->nlmsg_flags
& NLM_F_DUMP_INTR
)
380 if (nlh
->nlmsg_type
== NLMSG_DONE
)
383 if (nlh
->nlmsg_type
== RTM_NEWLINK
)
385 /* A RTM_NEWLINK message can have IFLA_STATS data. We need to
386 know the size before creating the list to allocate enough
388 struct ifinfomsg
*ifim
= (struct ifinfomsg
*) NLMSG_DATA (nlh
);
389 struct rtattr
*rta
= IFLA_RTA (ifim
);
390 size_t rtasize
= IFLA_PAYLOAD (nlh
);
392 while (RTA_OK (rta
, rtasize
))
394 size_t rta_payload
= RTA_PAYLOAD (rta
);
396 if (rta
->rta_type
== IFLA_STATS
)
398 ifa_data_size
+= rta_payload
;
402 rta
= RTA_NEXT (rta
, rtasize
);
406 else if (nlh
->nlmsg_type
== RTM_NEWADDR
)
411 /* Return if no interface is up. */
412 if ((newlink
+ newaddr
) == 0)
415 /* Allocate memory for all entries we have and initialize next
417 ifas
= (struct ifaddrs_storage
*) calloc (1,
419 * sizeof (struct ifaddrs_storage
)
427 /* Table for mapping kernel index to entry in our list. */
428 map_newlink_data
= alloca (newlink
* sizeof (int));
429 memset (map_newlink_data
, '\xff', newlink
* sizeof (int));
431 ifa_data_ptr
= (char *) &ifas
[newlink
+ newaddr
];
432 newaddr_idx
= 0; /* Counter for newaddr index. */
434 /* Walk through the list of data we got from the kernel. */
435 for (nlp
= nh
.nlm_list
; nlp
; nlp
= nlp
->next
)
437 struct nlmsghdr
*nlh
;
438 size_t size
= nlp
->size
;
440 if (nlp
->nlh
== NULL
)
443 /* Walk through one message and look at the type: If it is our
444 message, we need RTM_NEWLINK/RTM_NEWADDR and stop if we reach
445 the end or we find the end marker (in this case we ignore the
447 for (nlh
= nlp
->nlh
; NLMSG_OK (nlh
, size
); nlh
= NLMSG_NEXT (nlh
, size
))
451 /* Check if the message is the one we want */
452 if ((pid_t
) nlh
->nlmsg_pid
!= nh
.pid
|| nlh
->nlmsg_seq
!= nlp
->seq
)
455 if (nlh
->nlmsg_type
== NLMSG_DONE
)
458 if (nlh
->nlmsg_type
== RTM_NEWLINK
)
460 /* We found a new interface. Now extract everything from the
461 interface data we got and need. */
462 struct ifinfomsg
*ifim
= (struct ifinfomsg
*) NLMSG_DATA (nlh
);
463 struct rtattr
*rta
= IFLA_RTA (ifim
);
464 size_t rtasize
= IFLA_PAYLOAD (nlh
);
466 /* Interfaces are stored in the first "newlink" entries
467 of our list, starting in the order as we got from the
469 ifa_index
= map_newlink (ifim
->ifi_index
- 1, ifas
,
470 map_newlink_data
, newlink
);
471 if (__glibc_unlikely (ifa_index
== -1))
478 ifas
[ifa_index
].ifa
.ifa_flags
= ifim
->ifi_flags
;
480 while (RTA_OK (rta
, rtasize
))
482 char *rta_data
= RTA_DATA (rta
);
483 size_t rta_payload
= RTA_PAYLOAD (rta
);
485 switch (rta
->rta_type
)
488 if (rta_payload
<= sizeof (ifas
[ifa_index
].addr
))
490 ifas
[ifa_index
].addr
.sl
.sll_family
= AF_PACKET
;
491 memcpy (ifas
[ifa_index
].addr
.sl
.sll_addr
,
492 (char *) rta_data
, rta_payload
);
493 ifas
[ifa_index
].addr
.sl
.sll_halen
= rta_payload
;
494 ifas
[ifa_index
].addr
.sl
.sll_ifindex
496 ifas
[ifa_index
].addr
.sl
.sll_hatype
= ifim
->ifi_type
;
498 ifas
[ifa_index
].ifa
.ifa_addr
499 = &ifas
[ifa_index
].addr
.sa
;
504 if (rta_payload
<= sizeof (ifas
[ifa_index
].broadaddr
))
506 ifas
[ifa_index
].broadaddr
.sl
.sll_family
= AF_PACKET
;
507 memcpy (ifas
[ifa_index
].broadaddr
.sl
.sll_addr
,
508 (char *) rta_data
, rta_payload
);
509 ifas
[ifa_index
].broadaddr
.sl
.sll_halen
= rta_payload
;
510 ifas
[ifa_index
].broadaddr
.sl
.sll_ifindex
512 ifas
[ifa_index
].broadaddr
.sl
.sll_hatype
515 ifas
[ifa_index
].ifa
.ifa_broadaddr
516 = &ifas
[ifa_index
].broadaddr
.sa
;
520 case IFLA_IFNAME
: /* Name of Interface */
521 if ((rta_payload
+ 1) <= sizeof (ifas
[ifa_index
].name
))
523 ifas
[ifa_index
].ifa
.ifa_name
= ifas
[ifa_index
].name
;
524 *(char *) __mempcpy (ifas
[ifa_index
].name
, rta_data
,
529 case IFLA_STATS
: /* Statistics of Interface */
530 ifas
[ifa_index
].ifa
.ifa_data
= ifa_data_ptr
;
531 ifa_data_ptr
+= rta_payload
;
532 memcpy (ifas
[ifa_index
].ifa
.ifa_data
, rta_data
,
548 rta
= RTA_NEXT (rta
, rtasize
);
551 else if (nlh
->nlmsg_type
== RTM_NEWADDR
)
553 struct ifaddrmsg
*ifam
= (struct ifaddrmsg
*) NLMSG_DATA (nlh
);
554 struct rtattr
*rta
= IFA_RTA (ifam
);
555 size_t rtasize
= IFA_PAYLOAD (nlh
);
557 /* New Addresses are stored in the order we got them from
558 the kernel after the interfaces. Theoretically it is possible
559 that we have holes in the interface part of the list,
560 but we always have already the interface for this address. */
561 ifa_index
= newlink
+ newaddr_idx
;
562 int idx
= map_newlink (ifam
->ifa_index
- 1, ifas
,
563 map_newlink_data
, newlink
);
564 if (__glibc_unlikely (idx
== -1))
566 ifas
[ifa_index
].ifa
.ifa_flags
= ifas
[idx
].ifa
.ifa_flags
;
568 ifas
[ifa_index
- 1].ifa
.ifa_next
= &ifas
[ifa_index
].ifa
;
571 while (RTA_OK (rta
, rtasize
))
573 char *rta_data
= RTA_DATA (rta
);
574 size_t rta_payload
= RTA_PAYLOAD (rta
);
576 switch (rta
->rta_type
)
582 if (ifas
[ifa_index
].ifa
.ifa_addr
!= NULL
)
584 /* In a point-to-poing network IFA_ADDRESS
585 contains the destination address, local
586 address is supplied in IFA_LOCAL attribute.
587 destination address and broadcast address
588 are stored in an union, so it doesn't matter
589 which name we use. */
590 ifas
[ifa_index
].ifa
.ifa_broadaddr
591 = &ifas
[ifa_index
].broadaddr
.sa
;
592 sa
= &ifas
[ifa_index
].broadaddr
.sa
;
596 ifas
[ifa_index
].ifa
.ifa_addr
597 = &ifas
[ifa_index
].addr
.sa
;
598 sa
= &ifas
[ifa_index
].addr
.sa
;
601 sa
->sa_family
= ifam
->ifa_family
;
603 switch (ifam
->ifa_family
)
606 /* Size must match that of an address for IPv4. */
607 if (rta_payload
== 4)
608 memcpy (&((struct sockaddr_in
*) sa
)->sin_addr
,
609 rta_data
, rta_payload
);
613 /* Size must match that of an address for IPv6. */
614 if (rta_payload
== 16)
616 memcpy (&((struct sockaddr_in6
*) sa
)->sin6_addr
,
617 rta_data
, rta_payload
);
618 if (IN6_IS_ADDR_LINKLOCAL (rta_data
)
619 || IN6_IS_ADDR_MC_LINKLOCAL (rta_data
))
620 ((struct sockaddr_in6
*) sa
)->sin6_scope_id
626 if (rta_payload
<= sizeof (ifas
[ifa_index
].addr
))
627 memcpy (sa
->sa_data
, rta_data
, rta_payload
);
634 if (ifas
[ifa_index
].ifa
.ifa_addr
!= NULL
)
636 /* If ifa_addr is set and we get IFA_LOCAL,
637 assume we have a point-to-point network.
638 Move address to correct field. */
639 ifas
[ifa_index
].broadaddr
= ifas
[ifa_index
].addr
;
640 ifas
[ifa_index
].ifa
.ifa_broadaddr
641 = &ifas
[ifa_index
].broadaddr
.sa
;
642 memset (&ifas
[ifa_index
].addr
, '\0',
643 sizeof (ifas
[ifa_index
].addr
));
646 ifas
[ifa_index
].ifa
.ifa_addr
= &ifas
[ifa_index
].addr
.sa
;
647 ifas
[ifa_index
].ifa
.ifa_addr
->sa_family
650 switch (ifam
->ifa_family
)
653 /* Size must match that of an address for IPv4. */
654 if (rta_payload
== 4)
655 memcpy (&ifas
[ifa_index
].addr
.s4
.sin_addr
,
656 rta_data
, rta_payload
);
660 /* Size must match that of an address for IPv6. */
661 if (rta_payload
== 16)
663 memcpy (&ifas
[ifa_index
].addr
.s6
.sin6_addr
,
664 rta_data
, rta_payload
);
665 if (IN6_IS_ADDR_LINKLOCAL (rta_data
)
666 || IN6_IS_ADDR_MC_LINKLOCAL (rta_data
))
667 ifas
[ifa_index
].addr
.s6
.sin6_scope_id
=
673 if (rta_payload
<= sizeof (ifas
[ifa_index
].addr
))
674 memcpy (ifas
[ifa_index
].addr
.sa
.sa_data
,
675 rta_data
, rta_payload
);
681 /* We get IFA_BROADCAST, so IFA_LOCAL was too much. */
682 if (ifas
[ifa_index
].ifa
.ifa_broadaddr
!= NULL
)
683 memset (&ifas
[ifa_index
].broadaddr
, '\0',
684 sizeof (ifas
[ifa_index
].broadaddr
));
686 ifas
[ifa_index
].ifa
.ifa_broadaddr
687 = &ifas
[ifa_index
].broadaddr
.sa
;
688 ifas
[ifa_index
].ifa
.ifa_broadaddr
->sa_family
691 switch (ifam
->ifa_family
)
694 /* Size must match that of an address for IPv4. */
695 if (rta_payload
== 4)
696 memcpy (&ifas
[ifa_index
].broadaddr
.s4
.sin_addr
,
697 rta_data
, rta_payload
);
701 /* Size must match that of an address for IPv6. */
702 if (rta_payload
== 16)
704 memcpy (&ifas
[ifa_index
].broadaddr
.s6
.sin6_addr
,
705 rta_data
, rta_payload
);
706 if (IN6_IS_ADDR_LINKLOCAL (rta_data
)
707 || IN6_IS_ADDR_MC_LINKLOCAL (rta_data
))
708 ifas
[ifa_index
].broadaddr
.s6
.sin6_scope_id
714 if (rta_payload
<= sizeof (ifas
[ifa_index
].addr
))
715 memcpy (&ifas
[ifa_index
].broadaddr
.sa
.sa_data
,
716 rta_data
, rta_payload
);
722 if (rta_payload
+ 1 <= sizeof (ifas
[ifa_index
].name
))
724 ifas
[ifa_index
].ifa
.ifa_name
= ifas
[ifa_index
].name
;
725 *(char *) __mempcpy (ifas
[ifa_index
].name
, rta_data
,
740 rta
= RTA_NEXT (rta
, rtasize
);
743 /* If we didn't get the interface name with the
744 address, use the name from the interface entry. */
745 if (ifas
[ifa_index
].ifa
.ifa_name
== NULL
)
747 int idx
= map_newlink (ifam
->ifa_index
- 1, ifas
,
748 map_newlink_data
, newlink
);
749 if (__glibc_unlikely (idx
== -1))
751 ifas
[ifa_index
].ifa
.ifa_name
= ifas
[idx
].ifa
.ifa_name
;
754 /* Calculate the netmask. */
755 if (ifas
[ifa_index
].ifa
.ifa_addr
756 && ifas
[ifa_index
].ifa
.ifa_addr
->sa_family
!= AF_UNSPEC
757 && ifas
[ifa_index
].ifa
.ifa_addr
->sa_family
!= AF_PACKET
)
759 uint32_t max_prefixlen
= 0;
762 ifas
[ifa_index
].ifa
.ifa_netmask
763 = &ifas
[ifa_index
].netmask
.sa
;
765 switch (ifas
[ifa_index
].ifa
.ifa_addr
->sa_family
)
768 cp
= (char *) &ifas
[ifa_index
].netmask
.s4
.sin_addr
;
773 cp
= (char *) &ifas
[ifa_index
].netmask
.s6
.sin6_addr
;
778 ifas
[ifa_index
].ifa
.ifa_netmask
->sa_family
779 = ifas
[ifa_index
].ifa
.ifa_addr
->sa_family
;
783 unsigned int preflen
;
785 if (ifam
->ifa_prefixlen
> max_prefixlen
)
786 preflen
= max_prefixlen
;
788 preflen
= ifam
->ifa_prefixlen
;
790 for (i
= 0; i
< preflen
/ 8; i
++)
793 *cp
= 0xff << (8 - preflen
% 8);
800 assert (ifa_data_ptr
<= (char *) &ifas
[newlink
+ newaddr
] + ifa_data_size
);
804 for (i
= 0; i
< newlink
; ++i
)
805 if (map_newlink_data
[i
] == -1)
807 /* We have fewer links then we anticipated. Adjust the
808 forward pointer to the first address entry. */
809 ifas
[i
- 1].ifa
.ifa_next
= &ifas
[newlink
].ifa
;
812 if (i
== 0 && newlink
> 0)
813 /* No valid link, but we allocated memory. We have to
814 populate the first entry. */
815 memmove (ifas
, &ifas
[newlink
], sizeof (struct ifaddrs_storage
));
818 *ifap
= &ifas
[0].ifa
;
821 __netlink_free_handle (&nh
);
822 __netlink_close (&nh
);
828 /* Create a linked list of `struct ifaddrs' structures, one for each
829 network interface on the host machine. If successful, store the
830 list in *IFAP and return 0. On errors, return -1 and set `errno'. */
832 __getifaddrs (struct ifaddrs
**ifap
)
837 res
= getifaddrs_internal (ifap
);
838 while (res
== -EAGAIN
);
842 weak_alias (__getifaddrs
, getifaddrs
)
843 libc_hidden_def (__getifaddrs
)
844 libc_hidden_weak (getifaddrs
)
848 __freeifaddrs (struct ifaddrs
*ifa
)
852 weak_alias (__freeifaddrs
, freeifaddrs
)
853 libc_hidden_def (__freeifaddrs
)
854 libc_hidden_weak (freeifaddrs
)