2007-11-14 07:58:35 +01:00
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/* Determine whether interfaces use native transport. Linux version.
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2016-01-04 17:05:18 +01:00
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Copyright (C) 2007-2016 Free Software Foundation, Inc.
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2007-11-14 07:58:35 +01:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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2012-02-10 00:18:22 +01:00
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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2007-11-14 07:58:35 +01:00
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#include <assert.h>
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#include <errno.h>
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#include <ifaddrs.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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2011-06-14 22:11:39 +02:00
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#include <string.h>
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2007-11-14 07:58:35 +01:00
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#include <time.h>
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#include <unistd.h>
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#include <net/if.h>
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#include <net/if_arp.h>
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#include <sys/ioctl.h>
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2007-11-24 04:12:25 +01:00
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#include <asm/types.h>
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2007-11-14 07:58:35 +01:00
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <not-cancel.h>
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2015-11-09 12:48:41 +01:00
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#include "netlinkaccess.h"
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2007-11-14 07:58:35 +01:00
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void
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__check_native (uint32_t a1_index, int *a1_native,
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uint32_t a2_index, int *a2_native)
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{
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int fd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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struct sockaddr_nl nladdr;
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memset (&nladdr, '\0', sizeof (nladdr));
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nladdr.nl_family = AF_NETLINK;
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socklen_t addr_len = sizeof (nladdr);
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if (fd < 0
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|| __bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) != 0
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|| __getsockname (fd, (struct sockaddr *) &nladdr, &addr_len) != 0)
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return;
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pid_t pid = nladdr.nl_pid;
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struct req
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{
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struct nlmsghdr nlh;
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struct rtgenmsg g;
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/* struct rtgenmsg consists of a single byte. This means there
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are three bytes of padding included in the REQ definition.
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We make them explicit here. */
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char pad[3];
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} req;
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req.nlh.nlmsg_len = sizeof (req);
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req.nlh.nlmsg_type = RTM_GETLINK;
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req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
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req.nlh.nlmsg_pid = 0;
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req.nlh.nlmsg_seq = time (NULL);
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req.g.rtgen_family = AF_UNSPEC;
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assert (sizeof (req) - offsetof (struct req, pad) == 3);
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memset (req.pad, '\0', sizeof (req.pad));
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memset (&nladdr, '\0', sizeof (nladdr));
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nladdr.nl_family = AF_NETLINK;
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#ifdef PAGE_SIZE
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/* Help the compiler optimize out the malloc call if PAGE_SIZE
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is constant and smaller or equal to PTHREAD_STACK_MIN/4. */
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const size_t buf_size = PAGE_SIZE;
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#else
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const size_t buf_size = __getpagesize ();
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#endif
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bool use_malloc = false;
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char *buf;
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if (__libc_use_alloca (buf_size))
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buf = alloca (buf_size);
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else
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{
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buf = malloc (buf_size);
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if (buf != NULL)
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use_malloc = true;
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else
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goto out_fail;
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}
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struct iovec iov = { buf, buf_size };
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if (TEMP_FAILURE_RETRY (__sendto (fd, (void *) &req, sizeof (req), 0,
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(struct sockaddr *) &nladdr,
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sizeof (nladdr))) < 0)
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goto out_fail;
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bool done = false;
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do
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{
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struct msghdr msg =
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{
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2016-03-18 21:34:33 +01:00
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.msg_name = (void *) &nladdr,
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.msg_namelen = sizeof (nladdr),
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.msg_iov = &iov,
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.msg_iovlen = 1,
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.msg_control = NULL,
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.msg_controllen = 0,
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.msg_flags = 0
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2007-11-14 07:58:35 +01:00
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};
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ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0));
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2015-11-09 12:48:41 +01:00
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__netlink_assert_response (fd, read_len);
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2007-11-14 07:58:35 +01:00
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if (read_len < 0)
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goto out_fail;
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if (msg.msg_flags & MSG_TRUNC)
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goto out_fail;
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struct nlmsghdr *nlmh;
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for (nlmh = (struct nlmsghdr *) buf;
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NLMSG_OK (nlmh, (size_t) read_len);
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nlmh = (struct nlmsghdr *) NLMSG_NEXT (nlmh, read_len))
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{
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if (nladdr.nl_pid != 0 || (pid_t) nlmh->nlmsg_pid != pid
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|| nlmh->nlmsg_seq != req.nlh.nlmsg_seq)
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continue;
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if (nlmh->nlmsg_type == RTM_NEWLINK)
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{
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struct ifinfomsg *ifim = (struct ifinfomsg *) NLMSG_DATA (nlmh);
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2007-11-15 01:03:41 +01:00
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int native = (ifim->ifi_type != ARPHRD_TUNNEL6
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&& ifim->ifi_type != ARPHRD_TUNNEL
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&& ifim->ifi_type != ARPHRD_SIT);
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if (a1_index == ifim->ifi_index)
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{
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*a1_native = native;
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a1_index = 0xffffffffu;
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}
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if (a2_index == ifim->ifi_index)
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{
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*a2_native = native;
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a2_index = 0xffffffffu;
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}
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if (a1_index == 0xffffffffu
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&& a2_index == 0xffffffffu)
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goto out;
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2007-11-14 07:58:35 +01:00
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}
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else if (nlmh->nlmsg_type == NLMSG_DONE)
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/* We found the end, leave the loop. */
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done = true;
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}
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}
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while (! done);
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out:
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close_not_cancel_no_status (fd);
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return;
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out_fail:
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if (use_malloc)
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free (buf);
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}
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