159 lines
4.4 KiB
C
159 lines
4.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2018 The FreeBSD Foundation
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*
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* This software was developed by Mark Johnston under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/dnv.h>
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#include <sys/ioctl.h>
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#include <sys/nv.h>
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#include <sys/queue.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <errno.h>
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#include <ifaddrs.h>
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#include <string.h>
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#include <unistd.h>
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#include <libcasper.h>
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#include <libcasper_service.h>
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#include "rtsold.h"
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/*
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* A service to fetch the flags for the link-local IPv6 address on the specified
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* interface. This cannot easily be done in capability mode because we need to
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* use the routing socket sysctl API to find the link-local address of a
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* particular interface. The SIOCGIFCONF ioctl is one other option, but as
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* currently implemented it is less flexible (it cannot report the required
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* buffer length), and hard-codes a buffer length limit.
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*/
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static int
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llflags_get(const char *ifname, int *flagsp)
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{
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struct in6_ifreq ifr6;
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struct ifaddrs *ifap, *ifa;
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struct sockaddr_in6 *sin6;
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int error, s;
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s = socket(PF_INET6, SOCK_DGRAM, 0);
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if (s < 0)
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return (-1);
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if (getifaddrs(&ifap) != 0)
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return (-1);
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error = -1;
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for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
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if (strcmp(ifa->ifa_name, ifname) != 0)
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continue;
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if (ifa->ifa_addr->sa_family != AF_INET6)
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continue;
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sin6 = (struct sockaddr_in6 *)(void *)ifa->ifa_addr;
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if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
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continue;
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memset(&ifr6, 0, sizeof(ifr6));
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if (strlcpy(ifr6.ifr_name, ifname, sizeof(ifr6.ifr_name)) >=
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sizeof(ifr6.ifr_name)) {
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freeifaddrs(ifap);
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errno = EINVAL;
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return (-1);
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}
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memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
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if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
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error = errno;
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freeifaddrs(ifap);
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errno = error;
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return (-1);
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}
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*flagsp = ifr6.ifr_ifru.ifru_flags6;
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error = 0;
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break;
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}
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(void)close(s);
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freeifaddrs(ifap);
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if (error == -1)
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errno = ENOENT;
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return (error);
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}
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int
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cap_llflags_get(cap_channel_t *cap, const char *ifname, int *flagsp)
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{
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#ifdef WITH_CASPER
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nvlist_t *nvl;
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int error;
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nvl = nvlist_create(0);
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nvlist_add_string(nvl, "cmd", "get");
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nvlist_add_string(nvl, "ifname", ifname);
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nvl = cap_xfer_nvlist(cap, nvl);
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if (nvl == NULL)
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return (-1);
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error = (int)dnvlist_get_number(nvl, "error", 0);
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if (error == 0)
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*flagsp = (int)nvlist_get_number(nvl, "flags");
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nvlist_destroy(nvl);
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if (error != 0)
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errno = error;
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return (error == 0 ? 0 : -1);
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#else
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(void)cap;
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return (llflags_get(ifname, flagsp));
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#endif
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}
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#ifdef WITH_CASPER
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static int
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llflags_command(const char *cmd, const nvlist_t *limits __unused,
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nvlist_t *nvlin, nvlist_t *nvlout)
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{
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const char *ifname;
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int flags;
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if (strcmp(cmd, "get") != 0)
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return (EINVAL);
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ifname = nvlist_get_string(nvlin, "ifname");
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if (llflags_get(ifname, &flags) != 0)
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return (errno);
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nvlist_add_number(nvlout, "flags", flags);
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return (0);
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}
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CREATE_SERVICE("rtsold.llflags", NULL, llflags_command, 0);
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#endif /* WITH_CASPER */
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