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4f8f43b06e
If a request ends up growing beyong the initially allocated space the netlink functions (such as snl_add_msg_attr_u32()) will allocate a new buffer. This invalidates the header pointer we can have received from snl_create_msg_request(). Always use the hdr returned by snl_finalize_msg(). Reviewed by: melifaro MFC after: 1 week Sponsored by: Rubicon Communications, LLC ("Netgate") Differential Revision: https://reviews.freebsd.org/D42223
578 lines
14 KiB
C
578 lines
14 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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/ioctl.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <ctype.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <ifaddrs.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include "ifconfig.h"
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#include "ifconfig_netlink.h"
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#ifdef WITHOUT_NETLINK
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static struct in_aliasreq in_addreq;
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static struct ifreq in_ridreq;
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#else
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struct in_px {
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struct in_addr addr;
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int plen;
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bool addrset;
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bool maskset;
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};
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struct in_pdata {
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struct in_px addr;
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struct in_px dst_addr;
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struct in_px brd_addr;
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uint32_t flags;
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uint32_t vhid;
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};
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static struct in_pdata in_add, in_del;
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#endif
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static char addr_buf[NI_MAXHOST]; /*for getnameinfo()*/
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extern char *f_inet, *f_addr;
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static void
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print_addr(struct sockaddr_in *sin)
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{
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int error, n_flags;
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if (f_addr != NULL && strcmp(f_addr, "fqdn") == 0)
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n_flags = 0;
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else if (f_addr != NULL && strcmp(f_addr, "host") == 0)
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n_flags = NI_NOFQDN;
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else
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n_flags = NI_NUMERICHOST;
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error = getnameinfo((struct sockaddr *)sin, sin->sin_len, addr_buf,
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sizeof(addr_buf), NULL, 0, n_flags);
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if (error)
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inet_ntop(AF_INET, &sin->sin_addr, addr_buf, sizeof(addr_buf));
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printf("\tinet %s", addr_buf);
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}
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#ifdef WITHOUT_NETLINK
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static void
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in_status(if_ctx *ctx __unused, const struct ifaddrs *ifa)
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{
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struct sockaddr_in *sin, null_sin = {};
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sin = satosin(ifa->ifa_addr);
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if (sin == NULL)
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return;
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print_addr(sin);
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if (ifa->ifa_flags & IFF_POINTOPOINT) {
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sin = satosin(ifa->ifa_dstaddr);
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if (sin == NULL)
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sin = &null_sin;
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printf(" --> %s", inet_ntoa(sin->sin_addr));
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}
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sin = satosin(ifa->ifa_netmask);
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if (sin == NULL)
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sin = &null_sin;
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if (f_inet != NULL && strcmp(f_inet, "cidr") == 0) {
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int cidr = 32;
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unsigned long smask;
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smask = ntohl(sin->sin_addr.s_addr);
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while ((smask & 1) == 0) {
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smask = smask >> 1;
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cidr--;
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if (cidr == 0)
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break;
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}
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printf("/%d", cidr);
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} else if (f_inet != NULL && strcmp(f_inet, "dotted") == 0)
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printf(" netmask %s", inet_ntoa(sin->sin_addr));
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else
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printf(" netmask 0x%lx", (unsigned long)ntohl(sin->sin_addr.s_addr));
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if (ifa->ifa_flags & IFF_BROADCAST) {
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sin = satosin(ifa->ifa_broadaddr);
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if (sin != NULL && sin->sin_addr.s_addr != 0)
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printf(" broadcast %s", inet_ntoa(sin->sin_addr));
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}
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print_vhid(ifa);
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putchar('\n');
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}
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#else
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static struct in_addr
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get_mask(int plen)
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{
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struct in_addr a;
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a.s_addr = htonl(plen ? ~((1 << (32 - plen)) - 1) : 0);
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return (a);
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}
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static void
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in_status_nl(if_ctx *ctx __unused, if_link_t *link, if_addr_t *ifa)
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{
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struct sockaddr_in *sin = satosin(ifa->ifa_local);
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int plen = ifa->ifa_prefixlen;
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print_addr(sin);
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if (link->ifi_flags & IFF_POINTOPOINT) {
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struct sockaddr_in *dst = satosin(ifa->ifa_address);
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printf(" --> %s", inet_ntoa(dst->sin_addr));
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}
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if (f_inet != NULL && strcmp(f_inet, "cidr") == 0) {
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printf("/%d", plen);
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} else if (f_inet != NULL && strcmp(f_inet, "dotted") == 0)
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printf(" netmask %s", inet_ntoa(get_mask(plen)));
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else
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printf(" netmask 0x%lx", (unsigned long)ntohl(get_mask(plen).s_addr));
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if ((link->ifi_flags & IFF_BROADCAST) && plen != 0) {
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struct sockaddr_in *brd = satosin(ifa->ifa_broadcast);
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if (brd != NULL)
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printf(" broadcast %s", inet_ntoa(brd->sin_addr));
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}
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if (ifa->ifaf_vhid != 0)
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printf(" vhid %d", ifa->ifaf_vhid);
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putchar('\n');
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}
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#endif
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#ifdef WITHOUT_NETLINK
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#define SIN(x) ((struct sockaddr_in *) &(x))
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static struct sockaddr_in *sintab[] = {
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SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
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SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
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};
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static void
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in_copyaddr(if_ctx *ctx __unused, int to, int from)
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{
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memcpy(sintab[to], sintab[from], sizeof(struct sockaddr_in));
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}
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static void
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in_getaddr(const char *s, int which)
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{
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struct sockaddr_in *sin = sintab[which];
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struct hostent *hp;
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struct netent *np;
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sin->sin_len = sizeof(*sin);
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sin->sin_family = AF_INET;
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if (which == ADDR) {
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char *p = NULL;
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if((p = strrchr(s, '/')) != NULL) {
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const char *errstr;
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/* address is `name/masklen' */
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int masklen = 0;
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struct sockaddr_in *min = sintab[MASK];
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*p = '\0';
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if (!isdigit(*(p + 1)))
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errstr = "invalid";
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else
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masklen = (int)strtonum(p + 1, 0, 32, &errstr);
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if (errstr != NULL) {
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*p = '/';
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errx(1, "%s: bad value (width %s)", s, errstr);
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}
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min->sin_family = AF_INET;
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min->sin_len = sizeof(*min);
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min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) &
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0xffffffff);
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}
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}
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if (inet_aton(s, &sin->sin_addr))
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return;
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if ((hp = gethostbyname(s)) != NULL)
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bcopy(hp->h_addr, (char *)&sin->sin_addr,
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MIN((size_t)hp->h_length, sizeof(sin->sin_addr)));
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else if ((np = getnetbyname(s)) != NULL)
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sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
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else
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errx(1, "%s: bad value", s);
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}
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#else
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static struct in_px *sintab_nl[] = {
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&in_del.addr, /* RIDADDR */
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&in_add.addr, /* ADDR */
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NULL, /* MASK */
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&in_add.dst_addr, /* DSTADDR*/
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&in_add.brd_addr, /* BRDADDR*/
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};
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static void
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in_copyaddr(if_ctx *ctx __unused, int to, int from)
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{
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sintab_nl[to]->addr = sintab_nl[from]->addr;
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sintab_nl[to]->addrset = sintab_nl[from]->addrset;
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}
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static void
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in_getip(const char *addr_str, struct in_addr *ip)
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{
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struct hostent *hp;
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struct netent *np;
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if (inet_aton(addr_str, ip))
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return;
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if ((hp = gethostbyname(addr_str)) != NULL)
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bcopy(hp->h_addr, (char *)ip,
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MIN((size_t)hp->h_length, sizeof(ip)));
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else if ((np = getnetbyname(addr_str)) != NULL)
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*ip = inet_makeaddr(np->n_net, INADDR_ANY);
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else
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errx(1, "%s: bad value", addr_str);
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}
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static void
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in_getaddr(const char *s, int which)
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{
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struct in_px *px = sintab_nl[which];
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if (which == MASK) {
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struct in_px *px_addr = sintab_nl[ADDR];
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struct in_addr mask = {};
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in_getip(s, &mask);
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px_addr->plen = __bitcount32(mask.s_addr);
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px_addr->maskset = true;
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return;
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}
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if (which == ADDR) {
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char *p = NULL;
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if((p = strrchr(s, '/')) != NULL) {
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const char *errstr;
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/* address is `name/masklen' */
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int masklen;
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*p = '\0';
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if (!isdigit(*(p + 1)))
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errstr = "invalid";
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else
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masklen = (int)strtonum(p + 1, 0, 32, &errstr);
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if (errstr != NULL) {
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*p = '/';
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errx(1, "%s: bad value (width %s)", s, errstr);
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}
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px->plen = masklen;
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px->maskset = true;
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}
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}
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in_getip(s, &px->addr);
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px->addrset = true;
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}
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/*
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* Deletes the first found IPv4 interface address for the interface.
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*
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* This function provides SIOCDIFADDR semantics missing in Netlink.
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* When no valid IPv4 address is specified (sin_family or sin_len is wrong) to
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* the SIOCDIFADDR call, it deletes the first found IPv4 address on the interface.
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* 'ifconfig IFNAME inet addr/prefix' relies on that behavior, as it
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* executes empty SIOCDIFADDR before adding a new address.
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*/
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static int
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in_delete_first_nl(if_ctx *ctx)
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{
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struct nlmsghdr *hdr;
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struct ifaddrmsg *ifahdr;
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uint32_t nlmsg_seq;
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struct in_addr addr;
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struct snl_writer nw = {};
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struct snl_errmsg_data e = {};
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struct snl_state *ss = ctx->io_ss;
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bool found = false;
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uint32_t ifindex = if_nametoindex_nl(ss, ctx->ifname);
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if (ifindex == 0) {
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/* No interface with the desired name, nothing to delete */
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return (EADDRNOTAVAIL);
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}
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snl_init_writer(ss, &nw);
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hdr = snl_create_msg_request(&nw, NL_RTM_GETADDR);
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hdr->nlmsg_flags |= NLM_F_DUMP;
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ifahdr = snl_reserve_msg_object(&nw, struct ifaddrmsg);
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ifahdr->ifa_family = AF_INET;
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ifahdr->ifa_index = ifindex;
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if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr))
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return (EINVAL);
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nlmsg_seq = hdr->nlmsg_seq;
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while ((hdr = snl_read_reply_multi(ss, nlmsg_seq, &e)) != NULL) {
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struct snl_parsed_addr attrs = {};
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if (snl_parse_nlmsg(ss, hdr, &snl_rtm_addr_parser, &attrs)) {
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addr = satosin(attrs.ifa_local)->sin_addr;
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ifindex = attrs.ifa_index;
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found = true;
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break;
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} else
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return (EINVAL);
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}
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if (e.error != 0) {
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if (e.error_str != NULL)
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warnx("%s(): %s", __func__, e.error_str);
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return (e.error);
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}
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if (!found)
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return (0);
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/* Try to delete the found address */
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snl_init_writer(ss, &nw);
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hdr = snl_create_msg_request(&nw, NL_RTM_DELADDR);
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ifahdr = snl_reserve_msg_object(&nw, struct ifaddrmsg);
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ifahdr->ifa_family = AF_INET;
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ifahdr->ifa_index = ifindex;
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snl_add_msg_attr_ip4(&nw, IFA_LOCAL, &addr);
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if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr))
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return (EINVAL);
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memset(&e, 0, sizeof(e));
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snl_read_reply_code(ss, hdr->nlmsg_seq, &e);
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if (e.error_str != NULL)
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warnx("%s(): %s", __func__, e.error_str);
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return (e.error);
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}
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static int
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in_exec_nl(if_ctx *ctx, unsigned long action, void *data)
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{
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struct in_pdata *pdata = (struct in_pdata *)data;
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struct snl_writer nw = {};
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if (action == NL_RTM_DELADDR && !pdata->addr.addrset)
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return (in_delete_first_nl(ctx));
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snl_init_writer(ctx->io_ss, &nw);
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struct nlmsghdr *hdr = snl_create_msg_request(&nw, action);
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struct ifaddrmsg *ifahdr = snl_reserve_msg_object(&nw, struct ifaddrmsg);
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ifahdr->ifa_family = AF_INET;
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ifahdr->ifa_prefixlen = pdata->addr.plen;
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ifahdr->ifa_index = if_nametoindex_nl(ctx->io_ss, ctx->ifname);
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snl_add_msg_attr_ip4(&nw, IFA_LOCAL, &pdata->addr.addr);
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if (action == NL_RTM_NEWADDR && pdata->dst_addr.addrset)
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snl_add_msg_attr_ip4(&nw, IFA_ADDRESS, &pdata->dst_addr.addr);
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if (action == NL_RTM_NEWADDR && pdata->brd_addr.addrset)
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snl_add_msg_attr_ip4(&nw, IFA_BROADCAST, &pdata->brd_addr.addr);
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int off = snl_add_msg_attr_nested(&nw, IFA_FREEBSD);
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snl_add_msg_attr_u32(&nw, IFAF_FLAGS, pdata->flags);
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if (pdata->vhid != 0)
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snl_add_msg_attr_u32(&nw, IFAF_VHID, pdata->vhid);
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snl_end_attr_nested(&nw, off);
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if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ctx->io_ss, hdr))
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return (0);
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struct snl_errmsg_data e = {};
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snl_read_reply_code(ctx->io_ss, hdr->nlmsg_seq, &e);
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if (e.error_str != NULL)
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warnx("%s(): %s", __func__, e.error_str);
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return (e.error);
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}
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static void
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in_setdefaultmask_nl(void)
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{
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struct in_px *px = sintab_nl[ADDR];
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in_addr_t i = ntohl(px->addr.s_addr);
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/*
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* If netmask isn't supplied, use historical default.
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* This is deprecated for interfaces other than loopback
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* or point-to-point; warn in other cases. In the future
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* we should return an error rather than warning.
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*/
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if (IN_CLASSA(i))
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px->plen = IN_CLASSA_NSHIFT;
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else if (IN_CLASSB(i))
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px->plen = IN_CLASSB_NSHIFT;
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else
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px->plen = IN_CLASSC_NSHIFT;
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px->maskset = true;
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}
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#endif
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static void
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warn_nomask(int ifflags)
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{
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if ((ifflags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) {
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warnx("WARNING: setting interface address without mask "
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"is deprecated,\ndefault mask may not be correct.");
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}
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}
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static void
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in_postproc(if_ctx *ctx __unused, int newaddr, int ifflags)
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{
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#ifdef WITHOUT_NETLINK
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if (sintab[ADDR]->sin_len != 0 && sintab[MASK]->sin_len == 0 && newaddr) {
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warn_nomask(ifflags);
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}
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#else
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if (sintab_nl[ADDR]->addrset && !sintab_nl[ADDR]->maskset && newaddr) {
|
|
warn_nomask(ifflags);
|
|
in_setdefaultmask_nl();
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
in_status_tunnel(if_ctx *ctx)
|
|
{
|
|
char src[NI_MAXHOST];
|
|
char dst[NI_MAXHOST];
|
|
struct ifreq ifr;
|
|
const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr;
|
|
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
strlcpy(ifr.ifr_name, ctx->ifname, IFNAMSIZ);
|
|
|
|
if (ioctl_ctx(ctx, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0)
|
|
return;
|
|
if (sa->sa_family != AF_INET)
|
|
return;
|
|
if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0)
|
|
src[0] = '\0';
|
|
|
|
if (ioctl_ctx(ctx, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0)
|
|
return;
|
|
if (sa->sa_family != AF_INET)
|
|
return;
|
|
if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0)
|
|
dst[0] = '\0';
|
|
|
|
printf("\ttunnel inet %s --> %s\n", src, dst);
|
|
}
|
|
|
|
static void
|
|
in_set_tunnel(if_ctx *ctx, struct addrinfo *srcres, struct addrinfo *dstres)
|
|
{
|
|
struct in_aliasreq addreq;
|
|
|
|
memset(&addreq, 0, sizeof(addreq));
|
|
strlcpy(addreq.ifra_name, ctx->ifname, IFNAMSIZ);
|
|
memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
|
|
memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);
|
|
|
|
if (ioctl_ctx(ctx, SIOCSIFPHYADDR, &addreq) < 0)
|
|
warn("SIOCSIFPHYADDR");
|
|
}
|
|
|
|
static void
|
|
in_set_vhid(int vhid)
|
|
{
|
|
#ifdef WITHOUT_NETLINK
|
|
in_addreq.ifra_vhid = vhid;
|
|
#else
|
|
in_add.vhid = (uint32_t)vhid;
|
|
#endif
|
|
}
|
|
|
|
static struct afswtch af_inet = {
|
|
.af_name = "inet",
|
|
.af_af = AF_INET,
|
|
#ifdef WITHOUT_NETLINK
|
|
.af_status = in_status,
|
|
#else
|
|
.af_status = in_status_nl,
|
|
#endif
|
|
.af_getaddr = in_getaddr,
|
|
.af_copyaddr = in_copyaddr,
|
|
.af_postproc = in_postproc,
|
|
.af_status_tunnel = in_status_tunnel,
|
|
.af_settunnel = in_set_tunnel,
|
|
.af_setvhid = in_set_vhid,
|
|
#ifdef WITHOUT_NETLINK
|
|
.af_difaddr = SIOCDIFADDR,
|
|
.af_aifaddr = SIOCAIFADDR,
|
|
.af_ridreq = &in_ridreq,
|
|
.af_addreq = &in_addreq,
|
|
.af_exec = af_exec_ioctl,
|
|
#else
|
|
.af_difaddr = NL_RTM_DELADDR,
|
|
.af_aifaddr = NL_RTM_NEWADDR,
|
|
.af_ridreq = &in_del,
|
|
.af_addreq = &in_add,
|
|
.af_exec = in_exec_nl,
|
|
#endif
|
|
};
|
|
|
|
static __constructor void
|
|
inet_ctor(void)
|
|
{
|
|
|
|
#ifndef RESCUE
|
|
if (!feature_present("inet"))
|
|
return;
|
|
#endif
|
|
af_register(&af_inet);
|
|
}
|