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71498f308b
and protocol-independent host mode multicast. The code is written to accomodate IPv6, IGMPv3 and MLDv2 with only a little additional work. This change only pertains to FreeBSD's use as a multicast end-station and does not concern multicast routing; for an IGMPv3/MLDv2 router implementation, consider the XORP project. The work is based on Wilbert de Graaf's IGMPv3 code drop for FreeBSD 4.6, which is available at: http://www.kloosterhof.com/wilbert/igmpv3.html Summary * IPv4 multicast socket processing is now moved out of ip_output.c into a new module, in_mcast.c. * The in_mcast.c module implements the IPv4 legacy any-source API in terms of the protocol-independent source-specific API. * Source filters are lazy allocated as the common case does not use them. They are part of per inpcb state and are covered by the inpcb lock. * struct ip_mreqn is now supported to allow applications to specify multicast joins by interface index in the legacy IPv4 any-source API. * In UDP, an incoming multicast datagram only requires that the source port matches the 4-tuple if the socket was already bound by source port. An unbound socket SHOULD be able to receive multicasts sent from an ephemeral source port. * The UDP socket multicast filter mode defaults to exclusive, that is, sources present in the per-socket list will be blocked from delivery. * The RFC 3678 userland functions have been added to libc: setsourcefilter, getsourcefilter, setipv4sourcefilter, getipv4sourcefilter. * Definitions for IGMPv3 are merged but not yet used. * struct sockaddr_storage is now referenced from <netinet/in.h>. It is therefore defined there if not already declared in the same way as for the C99 types. * The RFC 1724 hack (specify 0.0.0.0/8 addresses to IP_MULTICAST_IF which are then interpreted as interface indexes) is now deprecated. * A patch for the Rhyolite.com routed in the FreeBSD base system is available in the -net archives. This only affects individuals running RIPv1 or RIPv2 via point-to-point and/or unnumbered interfaces. * Make IPv6 detach path similar to IPv4's in code flow; functionally same. * Bump __FreeBSD_version to 700048; see UPDATING. This work was financially supported by another FreeBSD committer. Obtained from: p4://bms_netdev Submitted by: Wilbert de Graaf (original work) Reviewed by: rwatson (locking), silence from fenner, net@ (but with encouragement)
438 lines
11 KiB
C
438 lines
11 KiB
C
/*-
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* Copyright (c) 2007 Bruce M. Simpson.
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* Copyright (c) 2000 Wilbert De Graaf.
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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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*
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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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* 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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/*
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* Diagnostic and test utility for IPv4 multicast sockets.
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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/errno.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/ethernet.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <err.h>
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#include <unistd.h>
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/* The following two socket options are private to the kernel and libc. */
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#ifndef IP_SETMSFILTER
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#define IP_SETMSFILTER 74 /* atomically set filter list */
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#endif
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#ifndef IP_GETMSFILTER
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#define IP_GETMSFILTER 75 /* get filter list */
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#endif
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static void process_file(char *, int);
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static void process_cmd(char*, int, FILE *fp);
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static void usage(void);
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#ifdef WITH_IGMPV3
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static int inaddr_cmp(const void *a, const void *b);
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#endif
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#define MAX_ADDRS 20
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#define STR_SIZE 20
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#define LINE_LENGTH 80
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int
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main(int argc, char **argv)
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{
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char line[LINE_LENGTH];
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char *p;
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int i, s;
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s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (s == -1)
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err(1, "can't open socket");
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if (argc < 2) {
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if (isatty(STDIN_FILENO)) {
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printf("multicast membership test program; "
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"enter ? for list of commands\n");
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}
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do {
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if (fgets(line, sizeof(line), stdin) != NULL) {
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if (line[0] != 'f')
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process_cmd(line, s, stdin);
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else {
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/* Get the filename */
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for (i = 1; isblank(line[i]); i++);
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if ((p = (char*)strchr(line, '\n'))
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!= NULL)
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*p = '\0';
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process_file(&line[i], s);
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}
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}
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} while (!feof(stdin));
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} else {
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for (i = 1; i < argc; i++) {
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process_file(argv[i], s);
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}
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}
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exit (0);
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}
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static void
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process_file(char *fname, int s)
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{
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char line[80];
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FILE *fp;
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char *lineptr;
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fp = fopen(fname, "r");
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if (fp == NULL) {
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warn("fopen");
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return;
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}
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/* Skip comments and empty lines. */
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while (fgets(line, sizeof(line), fp) != NULL) {
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lineptr = line;
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while (isblank(*lineptr))
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lineptr++;
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if (*lineptr != '#' && *lineptr != '\n')
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process_cmd(lineptr, s, fp);
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}
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fclose(fp);
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}
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static void
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process_cmd(char *cmd, int s, FILE *fp __unused)
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{
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char str1[STR_SIZE];
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char str2[STR_SIZE];
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char str3[STR_SIZE];
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#ifdef WITH_IGMPV3
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char filtbuf[IP_MSFILTER_SIZE(MAX_ADDRS)];
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#endif
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struct ifreq ifr;
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struct ip_mreq imr;
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struct ip_mreq_source imrs;
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#ifdef WITH_IGMPV3
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struct ip_msfilter *imsfp;
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#endif
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char *line;
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int n, opt, f, flags;
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line = cmd;
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while (isblank(*++line))
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; /* Skip whitespace. */
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switch (*cmd) {
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case '?':
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usage();
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break;
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case 'q':
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close(s);
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exit(0);
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case 's':
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if ((sscanf(line, "%d", &n) != 1) || (n < 1)) {
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printf("-1\n");
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break;
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}
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sleep(n);
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printf("ok\n");
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break;
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case 'j':
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case 'l':
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sscanf(line, "%s %s", str1, str2);
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if (((imr.imr_multiaddr.s_addr = inet_addr(str1)) ==
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INADDR_NONE) ||
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((imr.imr_interface.s_addr = inet_addr(str2)) ==
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INADDR_NONE)) {
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printf("-1\n");
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break;
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}
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opt = (*cmd == 'j') ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP;
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if (setsockopt( s, IPPROTO_IP, opt, &imr,
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sizeof(imr)) != 0)
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warn("setsockopt IP_ADD_MEMBERSHIP/IP_DROP_MEMBERSHIP");
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else
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printf("ok\n");
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break;
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case 'a':
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case 'd': {
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struct sockaddr_dl *dlp;
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struct ether_addr *ep;
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memset(&ifr, 0, sizeof(struct ifreq));
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dlp = (struct sockaddr_dl *)&ifr.ifr_addr;
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dlp->sdl_len = sizeof(struct sockaddr_dl);
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dlp->sdl_family = AF_LINK;
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dlp->sdl_index = 0;
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dlp->sdl_nlen = 0;
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dlp->sdl_alen = ETHER_ADDR_LEN;
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dlp->sdl_slen = 0;
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if (sscanf(line, "%s %s", str1, str2) != 2) {
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warnc(EINVAL, "sscanf");
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break;
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}
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ep = ether_aton(str2);
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if (ep == NULL) {
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warnc(EINVAL, "ether_aton");
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break;
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}
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strlcpy(ifr.ifr_name, str1, IF_NAMESIZE);
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memcpy(LLADDR(dlp), ep, ETHER_ADDR_LEN);
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if (ioctl(s, (*cmd == 'a') ? SIOCADDMULTI : SIOCDELMULTI,
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&ifr) == -1)
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warn("ioctl SIOCADDMULTI/SIOCDELMULTI");
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else
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printf("ok\n");
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break;
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}
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case 'm':
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printf("warning: IFF_ALLMULTI cannot be set from userland "
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"in FreeBSD; command ignored.\n");
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break;
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case 'p':
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if (sscanf(line, "%s %u", ifr.ifr_name, &f) != 2) {
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printf("-1\n");
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break;
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}
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if (ioctl(s, SIOCGIFFLAGS, &ifr) == -1) {
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warn("ioctl SIOCGIFFLAGS");
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break;
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}
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flags = (ifr.ifr_flags & 0xffff) | (ifr.ifr_flagshigh << 16);
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opt = IFF_PPROMISC;
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if (f == 0) {
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flags &= ~opt;
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} else {
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flags |= opt;
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}
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ifr.ifr_flags = flags & 0xffff;
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ifr.ifr_flagshigh = flags >> 16;
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if (ioctl(s, SIOCSIFFLAGS, &ifr) == -1)
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warn("ioctl SIOCGIFFLAGS");
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else
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printf( "changed to 0x%08x\n", flags );
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break;
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#ifdef WITH_IGMPV3
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/*
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* Set the socket to include or exclude filter mode, and
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* add some sources to the filterlist, using the full-state,
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* or advanced api.
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*/
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case 'i':
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case 'e':
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/* XXX: SIOCSIPMSFILTER will be made an internal API. */
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if ((sscanf(line, "%s %s %d", str1, str2, &n)) != 3) {
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printf("-1\n");
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break;
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}
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imsfp = (struct ip_msfilter *)filtbuf;
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if (((imsfp->imsf_multiaddr.s_addr = inet_addr(str1)) ==
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INADDR_NONE) ||
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((imsfp->imsf_interface.s_addr = inet_addr(str2)) ==
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INADDR_NONE) || (n > MAX_ADDRS)) {
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printf("-1\n");
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break;
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}
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imsfp->imsf_fmode = (*cmd == 'i') ? MCAST_INCLUDE :
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MCAST_EXCLUDE;
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imsfp->imsf_numsrc = n;
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for (i = 0; i < n; i++) {
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fgets(str1, sizeof(str1), fp);
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if ((imsfp->imsf_slist[i].s_addr = inet_addr(str1)) ==
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INADDR_NONE) {
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printf("-1\n");
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return;
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}
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}
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if (ioctl(s, SIOCSIPMSFILTER, imsfp) != 0)
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warn("setsockopt SIOCSIPMSFILTER");
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else
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printf("ok\n");
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break;
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#endif /* WITH_IGMPV3 */
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/*
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* Allow or block traffic from a source, using the
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* delta based api.
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* XXX: Currently we allow this to be used with the ASM-only
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* implementation of RFC3678 in FreeBSD 7.
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*/
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case 't':
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case 'b':
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sscanf(line, "%s %s %s", str1, str2, str3);
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if (((imrs.imr_multiaddr.s_addr = inet_addr(str1)) ==
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INADDR_NONE) ||
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((imrs.imr_interface.s_addr = inet_addr(str2)) ==
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INADDR_NONE) ||
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((imrs.imr_sourceaddr.s_addr = inet_addr(str3)) ==
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INADDR_NONE)) {
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printf("-1\n");
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break;
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}
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#ifdef WITH_IGMPV3
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/* XXX: SIOCSIPMSFILTER will be made an internal API. */
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/* First determine out current filter mode. */
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imsfp = (struct ip_msfilter *)filtbuf;
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imsfp->imsf_multiaddr.s_addr = imrs.imr_multiaddr.s_addr;
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imsfp->imsf_interface.s_addr = imrs.imr_interface.s_addr;
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imsfp->imsf_numsrc = 5;
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if (ioctl(s, SIOCSIPMSFILTER, imsfp) != 0) {
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/* It's only okay for 't' to fail */
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if (*cmd != 't') {
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warn("ioctl SIOCSIPMSFILTER");
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break;
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} else {
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imsfp->imsf_fmode = MCAST_INCLUDE;
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}
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}
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if (imsfp->imsf_fmode == MCAST_EXCLUDE) {
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/* Any source */
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opt = (*cmd == 't') ? IP_UNBLOCK_SOURCE :
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IP_BLOCK_SOURCE;
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} else {
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/* Controlled source */
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opt = (*cmd == 't') ? IP_ADD_SOURCE_MEMBERSHIP :
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IP_DROP_SOURCE_MEMBERSHIP;
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}
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#else /* !WITH_IGMPV3 */
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/*
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* Don't look before we leap; we may only block or unblock
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* sources on a socket in exclude mode.
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*/
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opt = (*cmd == 't') ? IP_UNBLOCK_SOURCE : IP_BLOCK_SOURCE;
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#endif /* WITH_IGMPV3 */
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if (setsockopt(s, IPPROTO_IP, opt, &imrs, sizeof(imrs)) == -1)
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warn("ioctl IP_ADD_SOURCE_MEMBERSHIP/IP_DROP_SOURCE_MEMBERSHIP/IP_UNBLOCK_SOURCE/IP_BLOCK_SOURCE");
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else
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printf("ok\n");
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break;
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#ifdef WITH_IGMPV3
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case 'g':
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/* XXX: SIOCSIPMSFILTER will be made an internal API. */
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if ((sscanf(line, "%s %s %d", str1, str2, &n)) != 3) {
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printf("-1\n");
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break;
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}
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imsfp = (struct ip_msfilter *)filtbuf;
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if (((imsfp->imsf_multiaddr.s_addr = inet_addr(str1)) ==
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INADDR_NONE) ||
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((imsfp->imsf_interface.s_addr = inet_addr(str2)) ==
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INADDR_NONE) || (n < 0 || n > MAX_ADDRS)) {
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printf("-1\n");
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break;
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}
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imsfp->imsf_numsrc = n;
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if (ioctl(s, SIOCSIPMSFILTER, imsfp) != 0) {
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warn("setsockopt SIOCSIPMSFILTER");
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break;
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}
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printf("%s\n", (imsfp->imsf_fmode == MCAST_INCLUDE) ?
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"include" : "exclude");
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printf("%d\n", imsfp->imsf_numsrc);
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if (n >= imsfp->imsf_numsrc) {
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n = imsfp->imsf_numsrc;
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qsort(imsfp->imsf_slist, n, sizeof(struct in_addr),
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&inaddr_cmp);
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for (i = 0; i < n; i++)
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printf("%s\n", inet_ntoa(imsfp->imsf_slist[i]));
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}
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break;
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#endif /* !WITH_IGMPV3 */
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#ifndef WITH_IGMPV3
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case 'i':
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case 'e':
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case 'g':
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printf("warning: IGMPv3 is not supported by this version "
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"of FreeBSD; command ignored.\n");
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break;
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#endif /* WITH_IGMPV3 */
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case '\n':
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break;
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default:
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printf("invalid command\n");
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break;
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}
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}
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static void
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usage(void)
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{
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printf("j g.g.g.g i.i.i.i - join IP multicast group\n");
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printf("l g.g.g.g i.i.i.i - leave IP multicast group\n");
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printf("a ifname e.e.e.e.e.e - add ether multicast address\n");
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printf("d ifname e.e.e.e.e.e - delete ether multicast address\n");
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printf("m ifname 1/0 - set/clear ether allmulti flag\n");
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printf("p ifname 1/0 - set/clear ether promisc flag\n");
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#ifdef WITH_IGMPv3
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printf("i g.g.g.g i.i.i.i n - set n include mode src filter\n");
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printf("e g.g.g.g i.i.i.i n - set n exclude mode src filter\n");
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#endif
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printf("t g.g.g.g i.i.i.i s.s.s.s - allow traffic from src\n");
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printf("b g.g.g.g i.i.i.i s.s.s.s - block traffic from src\n");
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#ifdef WITH_IGMPV3
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printf("g g.g.g.g i.i.i.i n - get and show n src filters\n");
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#endif
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printf("f filename - read command(s) from file\n");
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printf("s seconds - sleep for some time\n");
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printf("q - quit\n");
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}
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#ifdef WITH_IGMPV3
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static int
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inaddr_cmp(const void *a, const void *b)
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{
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return((int)((const struct in_addr *)a)->s_addr -
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((const struct in_addr *)b)->s_addr);
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}
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#endif
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