281 lines
7.3 KiB
C
281 lines
7.3 KiB
C
/* $KAME: probe.c,v 1.17 2003/10/05 00:09:36 itojun Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (C) 1998 WIDE Project.
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* All rights reserved.
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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
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* are 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 the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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/param.h>
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#include <sys/capsicum.h>
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#include <sys/dnv.h>
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#include <sys/nv.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <netinet/icmp6.h>
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#include <netinet6/nd6.h>
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#include <arpa/inet.h>
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#include <capsicum_helpers.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.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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static int
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getsocket(int *sockp, int proto)
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{
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cap_rights_t rights;
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int sock;
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if (*sockp >= 0)
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return (0);
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if ((sock = socket(AF_INET6, SOCK_RAW, proto)) < 0)
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return (-1);
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cap_rights_init(&rights, CAP_CONNECT, CAP_SEND);
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if (caph_rights_limit(sock, &rights) != 0)
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return (-1);
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*sockp = sock;
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return (0);
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}
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static ssize_t
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sendpacket(int sock, struct sockaddr_in6 *dst, uint32_t ifindex, int hoplimit,
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const void *data, size_t len)
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{
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uint8_t cmsg[CMSG_SPACE(sizeof(struct in6_pktinfo)) +
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CMSG_SPACE(sizeof(int))];
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struct msghdr hdr;
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struct iovec iov;
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struct in6_pktinfo *pi;
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struct cmsghdr *cm;
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memset(&hdr, 0, sizeof(hdr));
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hdr.msg_name = dst;
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hdr.msg_namelen = sizeof(*dst);
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hdr.msg_iov = &iov;
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hdr.msg_iovlen = 1;
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hdr.msg_control = cmsg;
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hdr.msg_controllen = sizeof(cmsg);
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iov.iov_base = __DECONST(void *, data);
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iov.iov_len = len;
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/* Specify the outbound interface. */
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cm = CMSG_FIRSTHDR(&hdr);
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cm->cmsg_level = IPPROTO_IPV6;
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cm->cmsg_type = IPV6_PKTINFO;
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cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
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pi = (struct in6_pktinfo *)(void *)CMSG_DATA(cm);
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memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
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pi->ipi6_ifindex = ifindex;
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/* Specify the hop limit of the packet for safety. */
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cm = CMSG_NXTHDR(&hdr, cm);
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cm->cmsg_level = IPPROTO_IPV6;
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cm->cmsg_type = IPV6_HOPLIMIT;
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cm->cmsg_len = CMSG_LEN(sizeof(int));
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memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
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return (sendmsg(sock, &hdr, 0));
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}
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static int
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probe_defrouters(uint32_t ifindex, uint32_t linkid)
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{
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static int probesock = -1;
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struct sockaddr_in6 dst;
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struct in6_defrouter *p, *ep;
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char *buf;
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size_t len;
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int mib[4];
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if (ifindex == 0)
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return (0);
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if (getsocket(&probesock, IPPROTO_NONE) != 0)
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return (-1);
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mib[0] = CTL_NET;
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mib[1] = PF_INET6;
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mib[2] = IPPROTO_ICMPV6;
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mib[3] = ICMPV6CTL_ND6_DRLIST;
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if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) < 0)
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return (-1);
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if (len == 0)
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return (0);
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memset(&dst, 0, sizeof(dst));
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dst.sin6_family = AF_INET6;
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dst.sin6_len = sizeof(dst);
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buf = malloc(len);
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if (buf == NULL)
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return (-1);
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if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) < 0)
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return (-1);
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ep = (struct in6_defrouter *)(void *)(buf + len);
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for (p = (struct in6_defrouter *)(void *)buf; p < ep; p++) {
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if (ifindex != p->if_index)
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continue;
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if (!IN6_IS_ADDR_LINKLOCAL(&p->rtaddr.sin6_addr))
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continue;
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dst.sin6_addr = p->rtaddr.sin6_addr;
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dst.sin6_scope_id = linkid;
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(void)sendpacket(probesock, &dst, ifindex, 1, NULL, 0);
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}
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free(buf);
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return (0);
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}
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static int
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rssend(uint32_t ifindex, uint32_t linkid, const void *data, size_t len)
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{
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static int rssock = -1;
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struct sockaddr_in6 dst;
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ssize_t n;
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if (getsocket(&rssock, IPPROTO_ICMPV6) != 0)
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return (-1);
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memset(&dst, 0, sizeof(dst));
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dst.sin6_family = AF_INET6;
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dst.sin6_len = sizeof(dst);
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dst.sin6_addr = (struct in6_addr)IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
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dst.sin6_scope_id = linkid;
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n = sendpacket(rssock, &dst, ifindex, 255, data, len);
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if (n < 0 || (size_t)n != len)
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return (-1);
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return (0);
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}
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int
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cap_probe_defrouters(cap_channel_t *cap, struct ifinfo *ifinfo)
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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", "probe_defrouters");
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nvlist_add_number(nvl, "ifindex", ifinfo->sdl->sdl_index);
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nvlist_add_number(nvl, "linkid", ifinfo->linkid);
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nvl = cap_xfer_nvlist(cap, nvl);
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if (nvl == NULL)
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return (errno);
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error = (int)dnvlist_get_number(nvl, "error", 0);
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nvlist_destroy(nvl);
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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 (probe_defrouters(ifinfo->sdl->sdl_index, ifinfo->linkid));
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#endif
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}
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int
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cap_rssend(cap_channel_t *cap, struct ifinfo *ifinfo)
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{
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int error;
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#ifdef WITH_CASPER
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nvlist_t *nvl = nvlist_create(0);
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nvlist_add_string(nvl, "cmd", "rssend");
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nvlist_add_number(nvl, "ifindex", ifinfo->sdl->sdl_index);
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nvlist_add_number(nvl, "linkid", ifinfo->linkid);
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nvlist_add_binary(nvl, "data", ifinfo->rs_data, ifinfo->rs_datalen);
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nvl = cap_xfer_nvlist(cap, nvl);
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if (nvl == NULL)
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return (errno);
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error = (int)dnvlist_get_number(nvl, "error", 0);
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nvlist_destroy(nvl);
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errno = error;
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#else
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(void)cap;
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error = rssend(ifinfo->sdl->sdl_index, ifinfo->linkid, ifinfo->rs_data,
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ifinfo->rs_datalen);
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#endif
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ifinfo->probes++;
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if (error != 0 && (errno != ENETDOWN || dflag > 0)) {
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error = errno;
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warnmsg(LOG_ERR, __func__, "sendmsg on %s: %s",
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ifinfo->ifname, strerror(errno));
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errno = error;
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}
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return (error == 0 ? 0 : -1);
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}
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#ifdef WITH_CASPER
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static int
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sendmsg_command(const char *cmd, const nvlist_t *limits __unused, nvlist_t *nvlin,
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nvlist_t *nvlout __unused)
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{
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const void *data;
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size_t len;
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uint32_t ifindex, linkid;
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int error;
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if (strcmp(cmd, "probe_defrouters") != 0 &&
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strcmp(cmd, "rssend") != 0)
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return (EINVAL);
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ifindex = (uint32_t)nvlist_get_number(nvlin, "ifindex");
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linkid = (uint32_t)nvlist_get_number(nvlin, "linkid");
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if (strcmp(cmd, "probe_defrouters") == 0) {
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error = probe_defrouters(ifindex, linkid);
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} else {
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data = nvlist_get_binary(nvlin, "data", &len);
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error = rssend(ifindex, linkid, data, len);
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}
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if (error != 0)
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return (errno);
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return (0);
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}
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CREATE_SERVICE("rtsold.sendmsg", NULL, sendmsg_command, 0);
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#endif /* WITH_CASPER */
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