2007-11-14 06:58:35 +00:00
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/* Determine whether interfaces use native transport. Linux version.
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2023-01-06 21:08:04 +00:00
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Copyright (C) 2007-2023 Free Software Foundation, Inc.
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2007-11-14 06:58:35 +00:00
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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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2012-02-09 23:18:22 +00:00
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License along with the GNU C Library; if not, see
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2007-11-14 06:58:35 +00:00
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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 20:11:39 +00:00
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#include <string.h>
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2007-11-14 06:58:35 +00:00
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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 03:12:25 +00:00
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#include <asm/types.h>
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2007-11-14 06:58:35 +00:00
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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 11:48:41 +00:00
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#include "netlinkaccess.h"
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2007-11-14 06:58:35 +00:00
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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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2017-04-19 05:45:04 +00:00
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int fd = __socket (PF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
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2007-11-14 06:58:35 +00:00
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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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2021-05-12 03:44:54 +00:00
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if (fd < 0)
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2007-11-14 06:58:35 +00:00
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return;
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2023-06-13 14:05:03 +00:00
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/* Netlink requires that user buffer needs to be either 8kb or page size
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(whichever is bigger), however this has been changed over time and now
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8Kb is sufficient (check NLMSG_DEFAULT_SIZE on Linux
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linux/include/linux/netlink.h). */
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const size_t buf_size = 8192;
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char *buf = malloc (buf_size);
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if (buf == NULL)
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goto out;
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2021-05-12 03:44:54 +00:00
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if (__bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) != 0
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|| __getsockname (fd, (struct sockaddr *) &nladdr, &addr_len) != 0)
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goto out;
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2007-11-14 06:58:35 +00:00
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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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2019-10-24 21:01:40 +00:00
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req.nlh.nlmsg_seq = time_now ();
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2007-11-14 06:58:35 +00:00
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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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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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2021-05-12 03:44:54 +00:00
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goto out;
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2007-11-14 06:58:35 +00:00
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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 20:34:33 +00:00
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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 06:58:35 +00:00
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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 11:48:41 +00:00
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__netlink_assert_response (fd, read_len);
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2007-11-14 06:58:35 +00:00
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if (read_len < 0)
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2021-05-12 03:44:54 +00:00
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goto out;
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2007-11-14 06:58:35 +00:00
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if (msg.msg_flags & MSG_TRUNC)
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2021-05-12 03:44:54 +00:00
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goto out;
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2007-11-14 06:58:35 +00:00
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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 00:03:41 +00:00
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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 06:58:35 +00:00
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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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2021-05-12 03:44:54 +00:00
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out:
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2017-07-03 18:22:58 +00:00
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__close_nocancel_nostatus (fd);
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2023-06-13 14:05:03 +00:00
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free (buf);
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2007-11-14 06:58:35 +00:00
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}
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