From ffd77d9ba5a1376d64ccbb2909a7179c05de81bc Mon Sep 17 00:00:00 2001 From: bms Date: Tue, 12 Jun 2007 16:24:56 +0000 Subject: Import rewrite of IPv4 socket multicast layer to support source-specific 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 . 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) --- usr.sbin/mtest/mtest.c | 38 +++++++++++++++++++++++++++++++++----- 1 file changed, 33 insertions(+), 5 deletions(-) (limited to 'usr.sbin') diff --git a/usr.sbin/mtest/mtest.c b/usr.sbin/mtest/mtest.c index 747a1f3..28c0fc6 100644 --- a/usr.sbin/mtest/mtest.c +++ b/usr.sbin/mtest/mtest.c @@ -55,6 +55,15 @@ __FBSDID("$FreeBSD$"); #include #include +/* The following two socket options are private to the kernel and libc. */ + +#ifndef IP_SETMSFILTER +#define IP_SETMSFILTER 74 /* atomically set filter list */ +#endif +#ifndef IP_GETMSFILTER +#define IP_GETMSFILTER 75 /* get filter list */ +#endif + static void process_file(char *, int); static void process_cmd(char*, int, FILE *fp); static void usage(void); @@ -135,14 +144,14 @@ process_cmd(char *cmd, int s, FILE *fp __unused) { char str1[STR_SIZE]; char str2[STR_SIZE]; -#ifdef WITH_IGMPV3 char str3[STR_SIZE]; +#ifdef WITH_IGMPV3 char filtbuf[IP_MSFILTER_SIZE(MAX_ADDRS)]; #endif struct ifreq ifr; struct ip_mreq imr; -#ifdef WITH_IGMPV3 struct ip_mreq_source imrs; +#ifdef WITH_IGMPV3 struct ip_msfilter *imsfp; #endif char *line; @@ -256,6 +265,7 @@ process_cmd(char *cmd, int s, FILE *fp __unused) */ case 'i': case 'e': + /* XXX: SIOCSIPMSFILTER will be made an internal API. */ if ((sscanf(line, "%s %s %d", str1, str2, &n)) != 3) { printf("-1\n"); break; @@ -284,10 +294,13 @@ process_cmd(char *cmd, int s, FILE *fp __unused) else printf("ok\n"); break; +#endif /* WITH_IGMPV3 */ /* * Allow or block traffic from a source, using the * delta based api. + * XXX: Currently we allow this to be used with the ASM-only + * implementation of RFC3678 in FreeBSD 7. */ case 't': case 'b': @@ -302,6 +315,8 @@ process_cmd(char *cmd, int s, FILE *fp __unused) break; } +#ifdef WITH_IGMPV3 + /* XXX: SIOCSIPMSFILTER will be made an internal API. */ /* First determine out current filter mode. */ imsfp = (struct ip_msfilter *)filtbuf; imsfp->imsf_multiaddr.s_addr = imrs.imr_multiaddr.s_addr; @@ -325,13 +340,22 @@ process_cmd(char *cmd, int s, FILE *fp __unused) opt = (*cmd == 't') ? IP_ADD_SOURCE_MEMBERSHIP : IP_DROP_SOURCE_MEMBERSHIP; } +#else /* !WITH_IGMPV3 */ + /* + * Don't look before we leap; we may only block or unblock + * sources on a socket in exclude mode. + */ + opt = (*cmd == 't') ? IP_UNBLOCK_SOURCE : IP_BLOCK_SOURCE; +#endif /* WITH_IGMPV3 */ if (setsockopt(s, IPPROTO_IP, opt, &imrs, sizeof(imrs)) == -1) warn("ioctl IP_ADD_SOURCE_MEMBERSHIP/IP_DROP_SOURCE_MEMBERSHIP/IP_UNBLOCK_SOURCE/IP_BLOCK_SOURCE"); else printf("ok\n"); break; +#ifdef WITH_IGMPV3 case 'g': + /* XXX: SIOCSIPMSFILTER will be made an internal API. */ if ((sscanf(line, "%s %s %d", str1, str2, &n)) != 3) { printf("-1\n"); break; @@ -360,11 +384,11 @@ process_cmd(char *cmd, int s, FILE *fp __unused) printf("%s\n", inet_ntoa(imsfp->imsf_slist[i])); } break; -#else /* !WITH_IGMPV3 */ +#endif /* !WITH_IGMPV3 */ + +#ifndef WITH_IGMPV3 case 'i': case 'e': - case 't': - case 'b': case 'g': printf("warning: IGMPv3 is not supported by this version " "of FreeBSD; command ignored.\n"); @@ -389,11 +413,15 @@ usage(void) printf("d ifname e.e.e.e.e.e - delete ether multicast address\n"); printf("m ifname 1/0 - set/clear ether allmulti flag\n"); printf("p ifname 1/0 - set/clear ether promisc flag\n"); +#ifdef WITH_IGMPv3 printf("i g.g.g.g i.i.i.i n - set n include mode src filter\n"); printf("e g.g.g.g i.i.i.i n - set n exclude mode src filter\n"); +#endif printf("t g.g.g.g i.i.i.i s.s.s.s - allow traffic from src\n"); printf("b g.g.g.g i.i.i.i s.s.s.s - block traffic from src\n"); +#ifdef WITH_IGMPV3 printf("g g.g.g.g i.i.i.i n - get and show n src filters\n"); +#endif printf("f filename - read command(s) from file\n"); printf("s seconds - sleep for some time\n"); printf("q - quit\n"); -- cgit v1.1