diff options
Diffstat (limited to 'usr.sbin/rtsold/cap_sendmsg.c')
| -rw-r--r-- | usr.sbin/rtsold/cap_sendmsg.c | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/usr.sbin/rtsold/cap_sendmsg.c b/usr.sbin/rtsold/cap_sendmsg.c new file mode 100644 index 000000000000..6e7f156fbe62 --- /dev/null +++ b/usr.sbin/rtsold/cap_sendmsg.c @@ -0,0 +1,280 @@ +/* $KAME: probe.c,v 1.17 2003/10/05 00:09:36 itojun Exp $ */ + +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (C) 1998 WIDE Project. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the project nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/param.h> +#include <sys/capsicum.h> +#include <sys/dnv.h> +#include <sys/nv.h> +#include <sys/socket.h> +#include <sys/sysctl.h> + +#include <net/if.h> +#include <net/if_dl.h> + +#include <netinet/in.h> +#include <netinet6/in6_var.h> +#include <netinet/icmp6.h> +#include <netinet6/nd6.h> + +#include <arpa/inet.h> + +#include <capsicum_helpers.h> +#include <errno.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> + +#include <libcasper.h> +#include <libcasper_service.h> + +#include "rtsold.h" + +static int +getsocket(int *sockp, int proto) +{ + cap_rights_t rights; + int sock; + + if (*sockp >= 0) + return (0); + + if ((sock = socket(AF_INET6, SOCK_RAW, proto)) < 0) + return (-1); + cap_rights_init(&rights, CAP_CONNECT, CAP_SEND); + if (caph_rights_limit(sock, &rights) != 0) + return (-1); + *sockp = sock; + + return (0); +} + +static ssize_t +sendpacket(int sock, struct sockaddr_in6 *dst, uint32_t ifindex, int hoplimit, + const void *data, size_t len) +{ + uint8_t cmsg[CMSG_SPACE(sizeof(struct in6_pktinfo)) + + CMSG_SPACE(sizeof(int))]; + struct msghdr hdr; + struct iovec iov; + struct in6_pktinfo *pi; + struct cmsghdr *cm; + + memset(&hdr, 0, sizeof(hdr)); + hdr.msg_name = dst; + hdr.msg_namelen = sizeof(*dst); + hdr.msg_iov = &iov; + hdr.msg_iovlen = 1; + hdr.msg_control = cmsg; + hdr.msg_controllen = sizeof(cmsg); + + iov.iov_base = __DECONST(void *, data); + iov.iov_len = len; + + /* Specify the outbound interface. */ + cm = CMSG_FIRSTHDR(&hdr); + cm->cmsg_level = IPPROTO_IPV6; + cm->cmsg_type = IPV6_PKTINFO; + cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); + pi = (struct in6_pktinfo *)(void *)CMSG_DATA(cm); + memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/ + pi->ipi6_ifindex = ifindex; + + /* Specify the hop limit of the packet for safety. */ + cm = CMSG_NXTHDR(&hdr, cm); + cm->cmsg_level = IPPROTO_IPV6; + cm->cmsg_type = IPV6_HOPLIMIT; + cm->cmsg_len = CMSG_LEN(sizeof(int)); + memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int)); + + return (sendmsg(sock, &hdr, 0)); +} + +static int +probe_defrouters(uint32_t ifindex, uint32_t linkid) +{ + static int probesock = -1; + struct sockaddr_in6 dst; + struct in6_defrouter *p, *ep; + char *buf; + size_t len; + int mib[4]; + + if (ifindex == 0) + return (0); + if (getsocket(&probesock, IPPROTO_NONE) != 0) + return (-1); + + mib[0] = CTL_NET; + mib[1] = PF_INET6; + mib[2] = IPPROTO_ICMPV6; + mib[3] = ICMPV6CTL_ND6_DRLIST; + if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) < 0) + return (-1); + if (len == 0) + return (0); + + memset(&dst, 0, sizeof(dst)); + dst.sin6_family = AF_INET6; + dst.sin6_len = sizeof(dst); + + buf = malloc(len); + if (buf == NULL) + return (-1); + if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) < 0) + return (-1); + ep = (struct in6_defrouter *)(void *)(buf + len); + for (p = (struct in6_defrouter *)(void *)buf; p < ep; p++) { + if (ifindex != p->if_index) + continue; + if (!IN6_IS_ADDR_LINKLOCAL(&p->rtaddr.sin6_addr)) + continue; + dst.sin6_addr = p->rtaddr.sin6_addr; + dst.sin6_scope_id = linkid; + (void)sendpacket(probesock, &dst, ifindex, 1, NULL, 0); + } + free(buf); + + return (0); +} + +static int +rssend(uint32_t ifindex, uint32_t linkid, const void *data, size_t len) +{ + static int rssock = -1; + struct sockaddr_in6 dst; + ssize_t n; + + if (getsocket(&rssock, IPPROTO_ICMPV6) != 0) + return (-1); + + memset(&dst, 0, sizeof(dst)); + dst.sin6_family = AF_INET6; + dst.sin6_len = sizeof(dst); + dst.sin6_addr = (struct in6_addr)IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; + dst.sin6_scope_id = linkid; + + n = sendpacket(rssock, &dst, ifindex, 255, data, len); + if (n < 0 || (size_t)n != len) + return (-1); + return (0); +} + +int +cap_probe_defrouters(cap_channel_t *cap, struct ifinfo *ifinfo) +{ +#ifdef WITH_CASPER + nvlist_t *nvl; + int error; + + nvl = nvlist_create(0); + nvlist_add_string(nvl, "cmd", "probe_defrouters"); + nvlist_add_number(nvl, "ifindex", ifinfo->sdl->sdl_index); + nvlist_add_number(nvl, "linkid", ifinfo->linkid); + + nvl = cap_xfer_nvlist(cap, nvl); + if (nvl == NULL) + return (errno); + error = (int)dnvlist_get_number(nvl, "error", 0); + nvlist_destroy(nvl); + errno = error; + return (error == 0 ? 0 : -1); +#else + (void)cap; + return (probe_defrouters(ifinfo->sdl->sdl_index, ifinfo->linkid)); +#endif +} + +int +cap_rssend(cap_channel_t *cap, struct ifinfo *ifinfo) +{ + int error; + +#ifdef WITH_CASPER + nvlist_t *nvl = nvlist_create(0); + nvlist_add_string(nvl, "cmd", "rssend"); + nvlist_add_number(nvl, "ifindex", ifinfo->sdl->sdl_index); + nvlist_add_number(nvl, "linkid", ifinfo->linkid); + nvlist_add_binary(nvl, "data", ifinfo->rs_data, ifinfo->rs_datalen); + + nvl = cap_xfer_nvlist(cap, nvl); + if (nvl == NULL) + return (errno); + error = (int)dnvlist_get_number(nvl, "error", 0); + nvlist_destroy(nvl); + errno = error; +#else + (void)cap; + error = rssend(ifinfo->sdl->sdl_index, ifinfo->linkid, ifinfo->rs_data, + ifinfo->rs_datalen); +#endif + + ifinfo->probes++; + if (error != 0 && (errno != ENETDOWN || dflag > 0)) { + error = errno; + warnmsg(LOG_ERR, __func__, "sendmsg on %s: %s", + ifinfo->ifname, strerror(errno)); + errno = error; + } + return (error == 0 ? 0 : -1); +} + +#ifdef WITH_CASPER +static int +sendmsg_command(const char *cmd, const nvlist_t *limits __unused, nvlist_t *nvlin, + nvlist_t *nvlout __unused) +{ + const void *data; + size_t len; + uint32_t ifindex, linkid; + int error; + + if (strcmp(cmd, "probe_defrouters") != 0 && + strcmp(cmd, "rssend") != 0) + return (EINVAL); + + ifindex = (uint32_t)nvlist_get_number(nvlin, "ifindex"); + linkid = (uint32_t)nvlist_get_number(nvlin, "linkid"); + if (strcmp(cmd, "probe_defrouters") == 0) { + error = probe_defrouters(ifindex, linkid); + } else { + data = nvlist_get_binary(nvlin, "data", &len); + error = rssend(ifindex, linkid, data, len); + } + if (error != 0) + return (errno); + return (0); +} + +CREATE_SERVICE("rtsold.sendmsg", NULL, sendmsg_command, 0); +#endif /* WITH_CASPER */ |