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This set of patches enables IP multicasting to work under FreeBSD. I am
submitting them as context diffs for the following files: sys/netinet/ip_mroute.c sys/netinet/ip_var.h sys/netinet/raw_ip.c usr.sbin/mrouted/igmp.c usr.sbin/mrouted/prune.c The routine rip_ip_input in raw_ip.c is suggested by Mark Tinguely (tinguely@plains.nodak.edu). I have been running mrouted with these patches for over a week and nothing has seemed seriously wrong. It is being run in two places on our network as a tunnel on one and a subnet querier on the other. The only problem I have run into is that mrouted on the tunnel must start up last or the pruning isn't done correctly and multicast packets flood your subnets. Submitted by: Soochon Radee <slr@mitre.org>
This commit is contained in:
Garrett Wollman
parent
619e03fa69
commit
d99c7a23fa
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=7083
@ -23,7 +23,6 @@
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/raw_cb.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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@ -104,7 +103,7 @@ void multiencap_decap(struct mbuf *m) { /* XXX must fixup manually */
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int (*legal_vif_num)(int) = 0;
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#else
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#else /* MROUTING */
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#define INSIZ sizeof(struct in_addr)
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#define same(a1, a2) \
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@ -121,7 +120,7 @@ struct socket *ip_mrouter = NULL;
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struct mrtstat mrtstat;
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int ip_mrtproto = IGMP_DVMRP; /* for netstat only */
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#else
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#else /* MROUTE_LKM */
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extern struct mrtstat mrtstat;
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extern int ip_mrtproto;
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#endif
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@ -177,6 +176,7 @@ struct ip multicast_encap_iphdr = {
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* Private variables.
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*/
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static vifi_t numvifs = 0;
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static void (*encap_oldrawip)() = 0;
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/*
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* one-back cache used by multiencap_decap to locate a tunnel's vif
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@ -212,6 +212,7 @@ void tbf_send_packet(struct vif *, struct mbuf *, struct ip_moptions *);
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void tbf_update_tokens(struct vif *);
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static int priority(struct vif *, struct ip *);
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static int ip_mrouter_init(struct socket *);
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void multiencap_decap(struct mbuf *m);
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/*
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* A simple hash function: returns MFCHASHMOD of the low-order octet of
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@ -580,13 +581,17 @@ add_vif(vifcp)
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if (vifcp->vifc_flags & VIFF_TUNNEL) {
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if ((vifcp->vifc_flags & VIFF_SRCRT) == 0) {
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static int inited = 0;
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if(!inited) {
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if (encap_oldrawip == 0) {
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extern struct protosw inetsw[];
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extern u_char ip_protox[];
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register u_char pr = ip_protox[ENCAP_PROTO];
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encap_oldrawip = inetsw[pr].pr_input;
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inetsw[pr].pr_input = multiencap_decap;
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for (s = 0; s < MAXVIFS; ++s) {
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multicast_decap_if[s].if_name = "mdecap";
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multicast_decap_if[s].if_unit = s;
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}
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inited = 1;
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}
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ifp = &multicast_decap_if[vifcp->vifc_vifi];
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} else {
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@ -931,8 +936,9 @@ X_ip_mforward(ip, ifp, m, imo)
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int s;
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if (mrtdebug > 1)
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log(LOG_DEBUG, "ip_mforward: src %x, dst %x, ifp %x\n",
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ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), ifp);
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log(LOG_DEBUG, "ip_mforward: src %x, dst %x, ifp %x (%s%d)\n",
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ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), ifp,
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ifp->if_name, ifp->if_unit);
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if (ip->ip_hl < (IP_HDR_LEN + TUNNEL_LEN) >> 2 ||
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(ipoptions = (u_char *)(ip + 1))[1] != IPOPT_LSRR ) {
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@ -1119,9 +1125,7 @@ X_ip_mforward(ip, ifp, m, imo)
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mrtstat.mrts_upcalls++;
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raw_input(mm, &k_igmpproto,
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(struct sockaddr *)&k_igmpsrc,
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(struct sockaddr *)&k_igmpdst);
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rip_ip_input(mm, ip_mrouter, (struct sockaddr *)&k_igmpsrc);
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/* set timer to cleanup entry if upcall is lost */
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timeout(cleanup_cache, (caddr_t)mb_rt, 100);
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@ -1519,15 +1523,19 @@ multiencap_decap(m)
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mrtstat.mrts_cant_tunnel++; /*XXX*/
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m_freem(m);
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if (mrtdebug)
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log(LOG_DEBUG, "ip_mforward: no tunnel with %u\n",
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log(LOG_DEBUG, "ip_mforward: no tunnel with %x\n",
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ntohl(ip->ip_src.s_addr));
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return;
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}
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ifp = vifp->v_ifp;
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hlen -= sizeof(struct ifnet *);
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m->m_data += hlen;
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m->m_len -= hlen;
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*(mtod(m, struct ifnet **)) = ifp;
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if (hlen > IP_HDR_LEN)
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ip_stripoptions(m, (struct mbuf *) 0);
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m->m_data += IP_HDR_LEN;
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m->m_len -= IP_HDR_LEN;
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m->m_pkthdr.len -= IP_HDR_LEN;
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m->m_pkthdr.rcvif = ifp;
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ifq = &ipintrq;
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s = splimp();
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if (IF_QFULL(ifq)) {
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@ -1879,8 +1887,8 @@ ip_mroute_mod_handle(struct lkm_table *lkmtp, int cmd)
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ip_mforward = X_ip_mforward;
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old_mrt_ioctl = mrt_ioctl;
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mrt_ioctl = X_mrt_ioctl;
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old_proto4_input = inetsw[ip_protox[IPPROTO_ENCAP]].pr_input;
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inetsw[ip_protox[IPPROTO_ENCAP]].pr_input = X_multiencap_decap;
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old_proto4_input = inetsw[ip_protox[ENCAP_PROTO]].pr_input;
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inetsw[ip_protox[ENCAP_PROTO]].pr_input = X_multiencap_decap;
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old_legal_vif_num = legal_vif_num;
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legal_vif_num = X_legal_vif_num;
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ip_mrtproto = IGMP_DVMRP;
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@ -1896,7 +1904,7 @@ ip_mroute_mod_handle(struct lkm_table *lkmtp, int cmd)
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ip_mrouter_done = old_ip_mrouter_done;
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ip_mforward = old_ip_mforward;
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mrt_ioctl = old_mrt_ioctl;
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inetsw[ip_protox[IPPROTO_ENCAP]].pr_input = old_proto4_input;
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inetsw[ip_protox[ENCAP_PROTO]].pr_input = old_proto4_input;
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legal_vif_num = old_legal_vif_num;
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ip_mrtproto = 0;
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break;
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)ip_var.h 8.1 (Berkeley) 6/10/93
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* $Id: ip_var.h,v 1.6 1994/09/14 03:10:14 wollman Exp $
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* $Id: ip_var.h,v 1.7 1995/02/14 06:25:17 phk Exp $
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*/
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#ifndef _NETINET_IP_VAR_H_
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@ -194,6 +194,10 @@ int rip_usrreq __P((struct socket *,
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int, struct mbuf *, struct mbuf *, struct mbuf *));
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int ip_rsvp_init __P((struct socket *));
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int ip_rsvp_done __P((void));
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void rip_ip_input __P((struct mbuf *mm,
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register struct socket *ip_mrouter, struct sockaddr *src));
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#endif
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#endif
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)raw_ip.c 8.2 (Berkeley) 1/4/94
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* $Id: raw_ip.c,v 1.14 1995/02/07 02:53:14 wollman Exp $
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* $Id: raw_ip.c,v 1.15 1995/02/14 06:24:40 phk Exp $
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*/
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#include <sys/param.h>
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@ -96,10 +96,10 @@ rip_input(m)
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if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
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continue;
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if (inp->inp_laddr.s_addr &&
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inp->inp_laddr.s_addr == ip->ip_dst.s_addr)
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inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
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continue;
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if (inp->inp_faddr.s_addr &&
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inp->inp_faddr.s_addr == ip->ip_src.s_addr)
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inp->inp_faddr.s_addr != ip->ip_src.s_addr)
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continue;
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if (last) {
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struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
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@ -123,6 +123,27 @@ rip_input(m)
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sorwakeup(last);
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} else {
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m_freem(m);
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ipstat.ips_noproto++;
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ipstat.ips_delivered--;
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}
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}
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void rip_ip_input(mm, ip_mrouter, src)
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struct mbuf *mm;
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register struct socket *ip_mrouter;
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struct sockaddr *src;
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{
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if (ip_mrouter)
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{
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if (sbappendaddr(&ip_mrouter->so_rcv, src,
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mm, (struct mbuf *) 0) == 0)
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m_freem(mm);
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else
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sorwakeup(ip_mrouter);
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}
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else
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{
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m_freem(mm);
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ipstat.ips_noproto++;
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ipstat.ips_delivered--;
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}
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@ -7,7 +7,7 @@
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* Leland Stanford Junior University.
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*
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*
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* $Id: igmp.c,v 1.8 1994/08/24 23:53:32 thyagara Exp $
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* igmp.c,v 1.2 1994/09/08 02:51:15 wollman Exp
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*/
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@ -181,12 +181,12 @@ void accept_igmp(recvlen)
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case DVMRP_PROBE:
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accept_probe(src, dst,
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(char *)(igmp+1), igmpdatalen, group);
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(char *)(igmp+1), igmpdatalen, ntohl(group));
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return;
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case DVMRP_REPORT:
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accept_report(src, dst,
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(char *)(igmp+1), igmpdatalen, group);
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(char *)(igmp+1), igmpdatalen, ntohl(group));
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return;
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case DVMRP_ASK_NEIGHBORS:
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@ -7,7 +7,7 @@
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* Leland Stanford Junior University.
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*
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*
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* $Id: prune.c,v 1.4 1994/08/24 23:54:33 thyagara Exp $
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* $Id: prune.c,v 1.2 1994/09/08 02:51:23 wollman Exp $
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*/
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@ -530,7 +530,12 @@ void send_prune(kt)
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*p++ = ((char *)&(kt->kt_origin))[i];
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for (i = 0; i < 4; i++)
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*p++ = ((char *)&(kt->kt_mcastgrp))[i];
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#if BYTE_ORDER == BIG_ENDIAN
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for (i = 0; i < 4; i++)
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#endif
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#if BYTE_ORDER == LITTLE_ENDIAN
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for (i = 3; i >= 0; i--)
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#endif
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*p++ = ((char *)&(kt->kt_prsent_timer))[i];
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datalen += 12;
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@ -589,7 +594,12 @@ void accept_prune(src, dst, p, datalen)
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((char *)&prun_src)[i] = *p++;
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for (i = 0; i< 4; i++)
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((char *)&prun_dst)[i] = *p++;
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#if BYTE_ORDER == BIG_ENDIAN
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for (i = 0; i< 4; i++)
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#endif
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#if BYTE_ORDER == LITTLE_ENDIAN
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for (i = 3; i >= 0; i--)
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#endif
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((char *)&prun_tmr)[i] = *p++;
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kt = find_src_grp(prun_src, prun_dst);
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@ -1051,7 +1061,7 @@ void age_table_entry()
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krl;
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prev_krl = krl, krl = krl->rl_next) {
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if ((krl->rl_timer -= ROUTE_MAX_REPORT_DELAY) <= 0) {
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log(LOG_DEBUG, 0, "forw again s %x g%x on vif %d",
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log(LOG_DEBUG, 0, "forw again s %x g %x on vif %d",
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kt->kt_origin, kt->kt_mcastgrp, krl->rl_vifi);
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if (!VIFM_ISSET(krl->rl_vifi, kt->kt_grpmems)) {
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