1cafed3941
drain routines are done by swi_net, which allows for better queue control at some future point. Packets may also be directly dispatched to a netisr instead of queued, this may be of interest at some installations, but currently defaults to off. Reviewed by: hsu, silby, jayanth, sam Sponsored by: DARPA, NAI Labs
1926 lines
47 KiB
C
1926 lines
47 KiB
C
/*
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* IP multicast forwarding procedures
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*
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* Written by David Waitzman, BBN Labs, August 1988.
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* Modified by Steve Deering, Stanford, February 1989.
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* Modified by Mark J. Steiglitz, Stanford, May, 1991
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* Modified by Van Jacobson, LBL, January 1993
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* Modified by Ajit Thyagarajan, PARC, August 1993
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* Modified by Bill Fenner, PARC, April 1995
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*
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* MROUTING Revision: 3.5
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* $FreeBSD$
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*/
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#include "opt_mac.h"
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#include "opt_mrouting.h"
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#include "opt_random_ip_id.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/signalvar.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sockio.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <net/if.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/igmp.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_encap.h>
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#include <netinet/ip_mroute.h>
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#include <netinet/ip_var.h>
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#include <netinet/udp.h>
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#include <machine/in_cksum.h>
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/*
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* Control debugging code for rsvp and multicast routing code.
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* Can only set them with the debugger.
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*/
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static u_int rsvpdebug; /* non-zero enables debugging */
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static u_int mrtdebug; /* any set of the flags below */
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#define DEBUG_MFC 0x02
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#define DEBUG_FORWARD 0x04
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#define DEBUG_EXPIRE 0x08
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#define DEBUG_XMIT 0x10
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#define M_HASCL(m) ((m)->m_flags & M_EXT)
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static MALLOC_DEFINE(M_MRTABLE, "mroutetbl", "multicast routing tables");
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static struct mrtstat mrtstat;
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SYSCTL_STRUCT(_net_inet_ip, OID_AUTO, mrtstat, CTLFLAG_RW,
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&mrtstat, mrtstat,
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"Multicast Routing Statistics (struct mrtstat, netinet/ip_mroute.h)");
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static struct mfc *mfctable[MFCTBLSIZ];
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static u_char nexpire[MFCTBLSIZ];
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static struct vif viftable[MAXVIFS];
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static struct callout_handle expire_upcalls_ch;
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#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
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#define UPCALL_EXPIRE 6 /* number of timeouts */
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/*
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* Define the token bucket filter structures
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* tbftable -> each vif has one of these for storing info
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*/
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static struct tbf tbftable[MAXVIFS];
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#define TBF_REPROCESS (hz / 100) /* 100x / second */
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/*
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* 'Interfaces' associated with decapsulator (so we can tell
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* packets that went through it from ones that get reflected
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* by a broken gateway). These interfaces are never linked into
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* the system ifnet list & no routes point to them. I.e., packets
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* can't be sent this way. They only exist as a placeholder for
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* multicast source verification.
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*/
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static struct ifnet multicast_decap_if[MAXVIFS];
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#define ENCAP_TTL 64
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#define ENCAP_PROTO IPPROTO_IPIP /* 4 */
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/* prototype IP hdr for encapsulated packets */
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static struct ip multicast_encap_iphdr = {
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#if BYTE_ORDER == LITTLE_ENDIAN
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sizeof(struct ip) >> 2, IPVERSION,
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#else
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IPVERSION, sizeof(struct ip) >> 2,
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#endif
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0, /* tos */
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sizeof(struct ip), /* total length */
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0, /* id */
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0, /* frag offset */
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ENCAP_TTL, ENCAP_PROTO,
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0, /* checksum */
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};
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/*
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* Private variables.
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*/
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static vifi_t numvifs;
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static const struct encaptab *encap_cookie;
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/*
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* one-back cache used by mroute_encapcheck to locate a tunnel's vif
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* given a datagram's src ip address.
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*/
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static u_long last_encap_src;
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static struct vif *last_encap_vif;
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static u_long X_ip_mcast_src(int vifi);
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static int X_ip_mforward(struct ip *ip, struct ifnet *ifp,
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struct mbuf *m, struct ip_moptions *imo);
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static int X_ip_mrouter_done(void);
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static int X_ip_mrouter_get(struct socket *so, struct sockopt *m);
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static int X_ip_mrouter_set(struct socket *so, struct sockopt *m);
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static int X_legal_vif_num(int vif);
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static int X_mrt_ioctl(int cmd, caddr_t data);
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static int get_sg_cnt(struct sioc_sg_req *);
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static int get_vif_cnt(struct sioc_vif_req *);
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static int ip_mrouter_init(struct socket *, int);
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static int add_vif(struct vifctl *);
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static int del_vif(vifi_t);
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static int add_mfc(struct mfcctl *);
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static int del_mfc(struct mfcctl *);
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static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in *);
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static int set_assert(int);
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static void expire_upcalls(void *);
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static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, vifi_t);
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static void phyint_send(struct ip *, struct vif *, struct mbuf *);
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static void encap_send(struct ip *, struct vif *, struct mbuf *);
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static void tbf_control(struct vif *, struct mbuf *, struct ip *, u_long);
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static void tbf_queue(struct vif *, struct mbuf *);
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static void tbf_process_q(struct vif *);
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static void tbf_reprocess_q(void *);
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static int tbf_dq_sel(struct vif *, struct ip *);
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static void tbf_send_packet(struct vif *, struct mbuf *);
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static void tbf_update_tokens(struct vif *);
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static int priority(struct vif *, struct ip *);
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/*
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* whether or not special PIM assert processing is enabled.
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*/
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static int pim_assert;
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/*
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* Rate limit for assert notification messages, in usec
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*/
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#define ASSERT_MSG_TIME 3000000
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/*
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* Hash function for a source, group entry
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*/
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#define MFCHASH(a, g) MFCHASHMOD(((a) >> 20) ^ ((a) >> 10) ^ (a) ^ \
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((g) >> 20) ^ ((g) >> 10) ^ (g))
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/*
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* Find a route for a given origin IP address and Multicast group address
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* Type of service parameter to be added in the future!!!
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* Statistics are updated by the caller if needed
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* (mrtstat.mrts_mfc_lookups and mrtstat.mrts_mfc_misses)
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*/
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static struct mfc *
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mfc_find(in_addr_t o, in_addr_t g)
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{
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struct mfc *rt;
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for (rt = mfctable[MFCHASH(o,g)]; rt; rt = rt->mfc_next)
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if ((rt->mfc_origin.s_addr == o) &&
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(rt->mfc_mcastgrp.s_addr == g) && (rt->mfc_stall == NULL))
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break;
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return rt;
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}
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/*
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* Macros to compute elapsed time efficiently
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* Borrowed from Van Jacobson's scheduling code
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*/
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#define TV_DELTA(a, b, delta) { \
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int xxs; \
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delta = (a).tv_usec - (b).tv_usec; \
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if ((xxs = (a).tv_sec - (b).tv_sec)) { \
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switch (xxs) { \
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case 2: \
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delta += 1000000; \
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/* FALLTHROUGH */ \
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case 1: \
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delta += 1000000; \
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break; \
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default: \
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delta += (1000000 * xxs); \
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} \
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} \
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}
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#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
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(a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
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/*
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* Handle MRT setsockopt commands to modify the multicast routing tables.
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*/
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static int
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X_ip_mrouter_set(struct socket *so, struct sockopt *sopt)
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{
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int error, optval;
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vifi_t vifi;
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struct vifctl vifc;
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struct mfcctl mfc;
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if (so != ip_mrouter && sopt->sopt_name != MRT_INIT)
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return EPERM;
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error = 0;
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switch (sopt->sopt_name) {
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case MRT_INIT:
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error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval);
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if (error)
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break;
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error = ip_mrouter_init(so, optval);
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break;
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case MRT_DONE:
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error = ip_mrouter_done();
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break;
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case MRT_ADD_VIF:
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error = sooptcopyin(sopt, &vifc, sizeof vifc, sizeof vifc);
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if (error)
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break;
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error = add_vif(&vifc);
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break;
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case MRT_DEL_VIF:
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error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi);
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if (error)
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break;
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error = del_vif(vifi);
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break;
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case MRT_ADD_MFC:
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case MRT_DEL_MFC:
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error = sooptcopyin(sopt, &mfc, sizeof mfc, sizeof mfc);
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if (error)
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break;
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if (sopt->sopt_name == MRT_ADD_MFC)
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error = add_mfc(&mfc);
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else
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error = del_mfc(&mfc);
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break;
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case MRT_ASSERT:
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error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval);
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if (error)
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break;
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set_assert(optval);
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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return error;
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}
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/*
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* Handle MRT getsockopt commands
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*/
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static int
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X_ip_mrouter_get(struct socket *so, struct sockopt *sopt)
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{
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int error;
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static int version = 0x0305; /* !!! why is this here? XXX */
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switch (sopt->sopt_name) {
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case MRT_VERSION:
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error = sooptcopyout(sopt, &version, sizeof version);
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break;
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case MRT_ASSERT:
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error = sooptcopyout(sopt, &pim_assert, sizeof pim_assert);
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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return error;
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}
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/*
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* Handle ioctl commands to obtain information from the cache
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*/
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static int
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X_mrt_ioctl(int cmd, caddr_t data)
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{
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int error = 0;
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switch (cmd) {
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case (SIOCGETVIFCNT):
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error = get_vif_cnt((struct sioc_vif_req *)data);
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break;
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case (SIOCGETSGCNT):
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error = get_sg_cnt((struct sioc_sg_req *)data);
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break;
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default:
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error = EINVAL;
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break;
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}
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return error;
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}
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/*
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* returns the packet, byte, rpf-failure count for the source group provided
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*/
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static int
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get_sg_cnt(struct sioc_sg_req *req)
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{
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int s;
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struct mfc *rt;
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s = splnet();
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rt = mfc_find(req->src.s_addr, req->grp.s_addr);
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splx(s);
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if (rt == NULL) {
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req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
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return EADDRNOTAVAIL;
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}
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req->pktcnt = rt->mfc_pkt_cnt;
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req->bytecnt = rt->mfc_byte_cnt;
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req->wrong_if = rt->mfc_wrong_if;
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return 0;
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}
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/*
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* returns the input and output packet and byte counts on the vif provided
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*/
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static int
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get_vif_cnt(struct sioc_vif_req *req)
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{
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vifi_t vifi = req->vifi;
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if (vifi >= numvifs)
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return EINVAL;
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req->icount = viftable[vifi].v_pkt_in;
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req->ocount = viftable[vifi].v_pkt_out;
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req->ibytes = viftable[vifi].v_bytes_in;
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req->obytes = viftable[vifi].v_bytes_out;
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return 0;
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}
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/*
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* Enable multicast routing
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*/
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static int
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ip_mrouter_init(struct socket *so, int version)
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{
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if (mrtdebug)
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log(LOG_DEBUG, "ip_mrouter_init: so_type = %d, pr_protocol = %d\n",
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so->so_type, so->so_proto->pr_protocol);
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if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_IGMP)
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return EOPNOTSUPP;
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if (version != 1)
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return ENOPROTOOPT;
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if (ip_mrouter != NULL)
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return EADDRINUSE;
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ip_mrouter = so;
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bzero((caddr_t)mfctable, sizeof(mfctable));
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bzero((caddr_t)nexpire, sizeof(nexpire));
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pim_assert = 0;
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expire_upcalls_ch = timeout(expire_upcalls, NULL, EXPIRE_TIMEOUT);
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if (mrtdebug)
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log(LOG_DEBUG, "ip_mrouter_init\n");
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return 0;
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}
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|
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/*
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* Disable multicast routing
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*/
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static int
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X_ip_mrouter_done(void)
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{
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vifi_t vifi;
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int i;
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struct ifnet *ifp;
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struct ifreq ifr;
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struct mfc *rt;
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struct rtdetq *rte;
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int s;
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s = splnet();
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|
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/*
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* For each phyint in use, disable promiscuous reception of all IP
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* multicasts.
|
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*/
|
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for (vifi = 0; vifi < numvifs; vifi++) {
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if (viftable[vifi].v_lcl_addr.s_addr != 0 &&
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!(viftable[vifi].v_flags & VIFF_TUNNEL)) {
|
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struct sockaddr_in *so = (struct sockaddr_in *)&(ifr.ifr_addr);
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|
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so->sin_len = sizeof(struct sockaddr_in);
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so->sin_family = AF_INET;
|
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so->sin_addr.s_addr = INADDR_ANY;
|
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ifp = viftable[vifi].v_ifp;
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if_allmulti(ifp, 0);
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}
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}
|
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bzero((caddr_t)tbftable, sizeof(tbftable));
|
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bzero((caddr_t)viftable, sizeof(viftable));
|
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numvifs = 0;
|
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pim_assert = 0;
|
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|
|
untimeout(expire_upcalls, NULL, expire_upcalls_ch);
|
|
|
|
/*
|
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* Free all multicast forwarding cache entries.
|
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*/
|
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for (i = 0; i < MFCTBLSIZ; i++) {
|
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for (rt = mfctable[i]; rt != NULL; ) {
|
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struct mfc *nr = rt->mfc_next;
|
|
|
|
for (rte = rt->mfc_stall; rte != NULL; ) {
|
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struct rtdetq *n = rte->next;
|
|
|
|
m_freem(rte->m);
|
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free(rte, M_MRTABLE);
|
|
rte = n;
|
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}
|
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free(rt, M_MRTABLE);
|
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rt = nr;
|
|
}
|
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}
|
|
|
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bzero((caddr_t)mfctable, sizeof(mfctable));
|
|
|
|
/*
|
|
* Reset de-encapsulation cache
|
|
*/
|
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last_encap_src = INADDR_ANY;
|
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last_encap_vif = NULL;
|
|
if (encap_cookie) {
|
|
encap_detach(encap_cookie);
|
|
encap_cookie = NULL;
|
|
}
|
|
|
|
ip_mrouter = NULL;
|
|
|
|
splx(s);
|
|
|
|
if (mrtdebug)
|
|
log(LOG_DEBUG, "ip_mrouter_done\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set PIM assert processing global
|
|
*/
|
|
static int
|
|
set_assert(int i)
|
|
{
|
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if ((i != 1) && (i != 0))
|
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return EINVAL;
|
|
|
|
pim_assert = i;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Decide if a packet is from a tunnelled peer.
|
|
* Return 0 if not, 64 if so. XXX yuck.. 64 ???
|
|
*/
|
|
static int
|
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mroute_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
|
|
{
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
int hlen = ip->ip_hl << 2;
|
|
|
|
/*
|
|
* don't claim the packet if it's not to a multicast destination or if
|
|
* we don't have an encapsulating tunnel with the source.
|
|
* Note: This code assumes that the remote site IP address
|
|
* uniquely identifies the tunnel (i.e., that this site has
|
|
* at most one tunnel with the remote site).
|
|
*/
|
|
if (!IN_MULTICAST(ntohl(((struct ip *)((char *)ip+hlen))->ip_dst.s_addr)))
|
|
return 0;
|
|
if (ip->ip_src.s_addr != last_encap_src) {
|
|
struct vif *vifp = viftable;
|
|
struct vif *vife = vifp + numvifs;
|
|
|
|
last_encap_src = ip->ip_src.s_addr;
|
|
last_encap_vif = NULL;
|
|
for ( ; vifp < vife; ++vifp)
|
|
if (vifp->v_rmt_addr.s_addr == ip->ip_src.s_addr) {
|
|
if ((vifp->v_flags & (VIFF_TUNNEL|VIFF_SRCRT)) == VIFF_TUNNEL)
|
|
last_encap_vif = vifp;
|
|
break;
|
|
}
|
|
}
|
|
if (last_encap_vif == NULL) {
|
|
last_encap_src = INADDR_ANY;
|
|
return 0;
|
|
}
|
|
return 64;
|
|
}
|
|
|
|
/*
|
|
* De-encapsulate a packet and feed it back through ip input (this
|
|
* routine is called whenever IP gets a packet that mroute_encap_func()
|
|
* claimed).
|
|
*/
|
|
static void
|
|
mroute_encap_input(struct mbuf *m, int off)
|
|
{
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
int hlen = ip->ip_hl << 2;
|
|
|
|
if (hlen > sizeof(struct ip))
|
|
ip_stripoptions(m, (struct mbuf *) 0);
|
|
m->m_data += sizeof(struct ip);
|
|
m->m_len -= sizeof(struct ip);
|
|
m->m_pkthdr.len -= sizeof(struct ip);
|
|
|
|
m->m_pkthdr.rcvif = last_encap_vif->v_ifp;
|
|
|
|
netisr_queue(NETISR_IP, m);
|
|
/*
|
|
* normally we would need a "schednetisr(NETISR_IP)"
|
|
* here but we were called by ip_input and it is going
|
|
* to loop back & try to dequeue the packet we just
|
|
* queued as soon as we return so we avoid the
|
|
* unnecessary software interrrupt.
|
|
*
|
|
* XXX
|
|
* This no longer holds - we may have direct-dispatched the packet,
|
|
* or there may be a queue processing limit.
|
|
*/
|
|
}
|
|
|
|
extern struct domain inetdomain;
|
|
static struct protosw mroute_encap_protosw =
|
|
{ SOCK_RAW, &inetdomain, IPPROTO_IPV4, PR_ATOMIC|PR_ADDR,
|
|
mroute_encap_input, 0, 0, rip_ctloutput,
|
|
0,
|
|
0, 0, 0, 0,
|
|
&rip_usrreqs
|
|
};
|
|
|
|
/*
|
|
* Add a vif to the vif table
|
|
*/
|
|
static int
|
|
add_vif(struct vifctl *vifcp)
|
|
{
|
|
struct vif *vifp = viftable + vifcp->vifc_vifi;
|
|
struct sockaddr_in sin = {sizeof sin, AF_INET};
|
|
struct ifaddr *ifa;
|
|
struct ifnet *ifp;
|
|
int error, s;
|
|
struct tbf *v_tbf = tbftable + vifcp->vifc_vifi;
|
|
|
|
if (vifcp->vifc_vifi >= MAXVIFS)
|
|
return EINVAL;
|
|
if (vifp->v_lcl_addr.s_addr != INADDR_ANY)
|
|
return EADDRINUSE;
|
|
if (vifcp->vifc_lcl_addr.s_addr == INADDR_ANY)
|
|
return EADDRNOTAVAIL;
|
|
|
|
/* Find the interface with an address in AF_INET family */
|
|
sin.sin_addr = vifcp->vifc_lcl_addr;
|
|
ifa = ifa_ifwithaddr((struct sockaddr *)&sin);
|
|
if (ifa == NULL)
|
|
return EADDRNOTAVAIL;
|
|
ifp = ifa->ifa_ifp;
|
|
|
|
if (vifcp->vifc_flags & VIFF_TUNNEL) {
|
|
if ((vifcp->vifc_flags & VIFF_SRCRT) == 0) {
|
|
/*
|
|
* An encapsulating tunnel is wanted. Tell
|
|
* mroute_encap_input() to start paying attention
|
|
* to encapsulated packets.
|
|
*/
|
|
if (encap_cookie == NULL) {
|
|
encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV4,
|
|
mroute_encapcheck,
|
|
(struct protosw *)&mroute_encap_protosw, NULL);
|
|
|
|
if (encap_cookie == NULL) {
|
|
printf("ip_mroute: unable to attach encap\n");
|
|
return EIO; /* XXX */
|
|
}
|
|
for (s = 0; s < MAXVIFS; ++s) {
|
|
multicast_decap_if[s].if_name = "mdecap";
|
|
multicast_decap_if[s].if_unit = s;
|
|
}
|
|
}
|
|
/*
|
|
* Set interface to fake encapsulator interface
|
|
*/
|
|
ifp = &multicast_decap_if[vifcp->vifc_vifi];
|
|
/*
|
|
* Prepare cached route entry
|
|
*/
|
|
bzero(&vifp->v_route, sizeof(vifp->v_route));
|
|
} else {
|
|
log(LOG_ERR, "source routed tunnels not supported\n");
|
|
return EOPNOTSUPP;
|
|
}
|
|
} else { /* Make sure the interface supports multicast */
|
|
if ((ifp->if_flags & IFF_MULTICAST) == 0)
|
|
return EOPNOTSUPP;
|
|
|
|
/* Enable promiscuous reception of all IP multicasts from the if */
|
|
s = splnet();
|
|
error = if_allmulti(ifp, 1);
|
|
splx(s);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
s = splnet();
|
|
/* define parameters for the tbf structure */
|
|
vifp->v_tbf = v_tbf;
|
|
GET_TIME(vifp->v_tbf->tbf_last_pkt_t);
|
|
vifp->v_tbf->tbf_n_tok = 0;
|
|
vifp->v_tbf->tbf_q_len = 0;
|
|
vifp->v_tbf->tbf_max_q_len = MAXQSIZE;
|
|
vifp->v_tbf->tbf_q = vifp->v_tbf->tbf_t = NULL;
|
|
|
|
vifp->v_flags = vifcp->vifc_flags;
|
|
vifp->v_threshold = vifcp->vifc_threshold;
|
|
vifp->v_lcl_addr = vifcp->vifc_lcl_addr;
|
|
vifp->v_rmt_addr = vifcp->vifc_rmt_addr;
|
|
vifp->v_ifp = ifp;
|
|
/* scaling up here allows division by 1024 in critical code */
|
|
vifp->v_rate_limit= vifcp->vifc_rate_limit * 1024 / 1000;
|
|
vifp->v_rsvp_on = 0;
|
|
vifp->v_rsvpd = NULL;
|
|
/* initialize per vif pkt counters */
|
|
vifp->v_pkt_in = 0;
|
|
vifp->v_pkt_out = 0;
|
|
vifp->v_bytes_in = 0;
|
|
vifp->v_bytes_out = 0;
|
|
splx(s);
|
|
|
|
/* Adjust numvifs up if the vifi is higher than numvifs */
|
|
if (numvifs <= vifcp->vifc_vifi) numvifs = vifcp->vifc_vifi + 1;
|
|
|
|
if (mrtdebug)
|
|
log(LOG_DEBUG, "add_vif #%d, lcladdr %lx, %s %lx, thresh %x, rate %d\n",
|
|
vifcp->vifc_vifi,
|
|
(u_long)ntohl(vifcp->vifc_lcl_addr.s_addr),
|
|
(vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask",
|
|
(u_long)ntohl(vifcp->vifc_rmt_addr.s_addr),
|
|
vifcp->vifc_threshold,
|
|
vifcp->vifc_rate_limit);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Delete a vif from the vif table
|
|
*/
|
|
static int
|
|
del_vif(vifi_t vifi)
|
|
{
|
|
struct vif *vifp;
|
|
int s;
|
|
|
|
if (vifi >= numvifs)
|
|
return EINVAL;
|
|
vifp = &viftable[vifi];
|
|
if (vifp->v_lcl_addr.s_addr == INADDR_ANY)
|
|
return EADDRNOTAVAIL;
|
|
|
|
s = splnet();
|
|
|
|
if (!(vifp->v_flags & VIFF_TUNNEL))
|
|
if_allmulti(vifp->v_ifp, 0);
|
|
|
|
if (vifp == last_encap_vif) {
|
|
last_encap_vif = NULL;
|
|
last_encap_src = INADDR_ANY;
|
|
}
|
|
|
|
/*
|
|
* Free packets queued at the interface
|
|
*/
|
|
while (vifp->v_tbf->tbf_q) {
|
|
struct mbuf *m = vifp->v_tbf->tbf_q;
|
|
|
|
vifp->v_tbf->tbf_q = m->m_act;
|
|
m_freem(m);
|
|
}
|
|
|
|
bzero((caddr_t)vifp->v_tbf, sizeof(*(vifp->v_tbf)));
|
|
bzero((caddr_t)vifp, sizeof (*vifp));
|
|
|
|
if (mrtdebug)
|
|
log(LOG_DEBUG, "del_vif %d, numvifs %d\n", vifi, numvifs);
|
|
|
|
/* Adjust numvifs down */
|
|
for (vifi = numvifs; vifi > 0; vifi--)
|
|
if (viftable[vifi-1].v_lcl_addr.s_addr != INADDR_ANY)
|
|
break;
|
|
numvifs = vifi;
|
|
|
|
splx(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* update an mfc entry without resetting counters and S,G addresses.
|
|
*/
|
|
static void
|
|
update_mfc_params(struct mfc *rt, struct mfcctl *mfccp)
|
|
{
|
|
int i;
|
|
|
|
rt->mfc_parent = mfccp->mfcc_parent;
|
|
for (i = 0; i < numvifs; i++)
|
|
rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
|
|
}
|
|
|
|
/*
|
|
* fully initialize an mfc entry from the parameter.
|
|
*/
|
|
static void
|
|
init_mfc_params(struct mfc *rt, struct mfcctl *mfccp)
|
|
{
|
|
rt->mfc_origin = mfccp->mfcc_origin;
|
|
rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp;
|
|
|
|
update_mfc_params(rt, mfccp);
|
|
|
|
/* initialize pkt counters per src-grp */
|
|
rt->mfc_pkt_cnt = 0;
|
|
rt->mfc_byte_cnt = 0;
|
|
rt->mfc_wrong_if = 0;
|
|
rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Add an mfc entry
|
|
*/
|
|
static int
|
|
add_mfc(struct mfcctl *mfccp)
|
|
{
|
|
struct mfc *rt;
|
|
u_long hash;
|
|
struct rtdetq *rte;
|
|
u_short nstl;
|
|
int s;
|
|
|
|
rt = mfc_find(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr);
|
|
|
|
/* If an entry already exists, just update the fields */
|
|
if (rt) {
|
|
if (mrtdebug & DEBUG_MFC)
|
|
log(LOG_DEBUG,"add_mfc update o %lx g %lx p %x\n",
|
|
(u_long)ntohl(mfccp->mfcc_origin.s_addr),
|
|
(u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
|
|
mfccp->mfcc_parent);
|
|
|
|
s = splnet();
|
|
update_mfc_params(rt, mfccp);
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Find the entry for which the upcall was made and update
|
|
*/
|
|
s = splnet();
|
|
hash = MFCHASH(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr);
|
|
for (rt = mfctable[hash], nstl = 0; rt; rt = rt->mfc_next) {
|
|
|
|
if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) &&
|
|
(rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr) &&
|
|
(rt->mfc_stall != NULL)) {
|
|
|
|
if (nstl++)
|
|
log(LOG_ERR, "add_mfc %s o %lx g %lx p %x dbx %p\n",
|
|
"multiple kernel entries",
|
|
(u_long)ntohl(mfccp->mfcc_origin.s_addr),
|
|
(u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
|
|
mfccp->mfcc_parent, (void *)rt->mfc_stall);
|
|
|
|
if (mrtdebug & DEBUG_MFC)
|
|
log(LOG_DEBUG,"add_mfc o %lx g %lx p %x dbg %p\n",
|
|
(u_long)ntohl(mfccp->mfcc_origin.s_addr),
|
|
(u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
|
|
mfccp->mfcc_parent, (void *)rt->mfc_stall);
|
|
|
|
init_mfc_params(rt, mfccp);
|
|
|
|
rt->mfc_expire = 0; /* Don't clean this guy up */
|
|
nexpire[hash]--;
|
|
|
|
/* free packets Qed at the end of this entry */
|
|
for (rte = rt->mfc_stall; rte != NULL; ) {
|
|
struct rtdetq *n = rte->next;
|
|
|
|
ip_mdq(rte->m, rte->ifp, rt, -1);
|
|
m_freem(rte->m);
|
|
free(rte, M_MRTABLE);
|
|
rte = n;
|
|
}
|
|
rt->mfc_stall = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* It is possible that an entry is being inserted without an upcall
|
|
*/
|
|
if (nstl == 0) {
|
|
if (mrtdebug & DEBUG_MFC)
|
|
log(LOG_DEBUG,"add_mfc no upcall h %lu o %lx g %lx p %x\n",
|
|
hash, (u_long)ntohl(mfccp->mfcc_origin.s_addr),
|
|
(u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
|
|
mfccp->mfcc_parent);
|
|
|
|
for (rt = mfctable[hash]; rt != NULL; rt = rt->mfc_next) {
|
|
if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) &&
|
|
(rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr)) {
|
|
init_mfc_params(rt, mfccp);
|
|
if (rt->mfc_expire)
|
|
nexpire[hash]--;
|
|
rt->mfc_expire = 0;
|
|
break; /* XXX */
|
|
}
|
|
}
|
|
if (rt == NULL) { /* no upcall, so make a new entry */
|
|
rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT);
|
|
if (rt == NULL) {
|
|
splx(s);
|
|
return ENOBUFS;
|
|
}
|
|
|
|
init_mfc_params(rt, mfccp);
|
|
rt->mfc_expire = 0;
|
|
rt->mfc_stall = NULL;
|
|
|
|
/* insert new entry at head of hash chain */
|
|
rt->mfc_next = mfctable[hash];
|
|
mfctable[hash] = rt;
|
|
}
|
|
}
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Delete an mfc entry
|
|
*/
|
|
static int
|
|
del_mfc(struct mfcctl *mfccp)
|
|
{
|
|
struct in_addr origin;
|
|
struct in_addr mcastgrp;
|
|
struct mfc *rt;
|
|
struct mfc **nptr;
|
|
u_long hash;
|
|
int s;
|
|
|
|
origin = mfccp->mfcc_origin;
|
|
mcastgrp = mfccp->mfcc_mcastgrp;
|
|
|
|
if (mrtdebug & DEBUG_MFC)
|
|
log(LOG_DEBUG,"del_mfc orig %lx mcastgrp %lx\n",
|
|
(u_long)ntohl(origin.s_addr), (u_long)ntohl(mcastgrp.s_addr));
|
|
|
|
s = splnet();
|
|
|
|
hash = MFCHASH(origin.s_addr, mcastgrp.s_addr);
|
|
for (nptr = &mfctable[hash]; (rt = *nptr) != NULL; nptr = &rt->mfc_next)
|
|
if (origin.s_addr == rt->mfc_origin.s_addr &&
|
|
mcastgrp.s_addr == rt->mfc_mcastgrp.s_addr &&
|
|
rt->mfc_stall == NULL)
|
|
break;
|
|
if (rt == NULL) {
|
|
splx(s);
|
|
return EADDRNOTAVAIL;
|
|
}
|
|
|
|
*nptr = rt->mfc_next;
|
|
free(rt, M_MRTABLE);
|
|
|
|
splx(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Send a message to mrouted on the multicast routing socket
|
|
*/
|
|
static int
|
|
socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in *src)
|
|
{
|
|
if (s) {
|
|
if (sbappendaddr(&s->so_rcv, (struct sockaddr *)src, mm, NULL) != 0) {
|
|
sorwakeup(s);
|
|
return 0;
|
|
}
|
|
}
|
|
m_freem(mm);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* IP multicast forwarding function. This function assumes that the packet
|
|
* pointed to by "ip" has arrived on (or is about to be sent to) the interface
|
|
* pointed to by "ifp", and the packet is to be relayed to other networks
|
|
* that have members of the packet's destination IP multicast group.
|
|
*
|
|
* The packet is returned unscathed to the caller, unless it is
|
|
* erroneous, in which case a non-zero return value tells the caller to
|
|
* discard it.
|
|
*/
|
|
|
|
#define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */
|
|
|
|
static int
|
|
X_ip_mforward(struct ip *ip, struct ifnet *ifp,
|
|
struct mbuf *m, struct ip_moptions *imo)
|
|
{
|
|
struct mfc *rt;
|
|
int s;
|
|
vifi_t vifi;
|
|
|
|
if (mrtdebug & DEBUG_FORWARD)
|
|
log(LOG_DEBUG, "ip_mforward: src %lx, dst %lx, ifp %p\n",
|
|
(u_long)ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr),
|
|
(void *)ifp);
|
|
|
|
if (ip->ip_hl < (sizeof(struct ip) + TUNNEL_LEN) >> 2 ||
|
|
((u_char *)(ip + 1))[1] != IPOPT_LSRR ) {
|
|
/*
|
|
* Packet arrived via a physical interface or
|
|
* an encapsulated tunnel.
|
|
*/
|
|
} else {
|
|
/*
|
|
* Packet arrived through a source-route tunnel.
|
|
* Source-route tunnels are no longer supported.
|
|
*/
|
|
static int last_log;
|
|
if (last_log != time_second) {
|
|
last_log = time_second;
|
|
log(LOG_ERR,
|
|
"ip_mforward: received source-routed packet from %lx\n",
|
|
(u_long)ntohl(ip->ip_src.s_addr));
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
if ((imo) && ((vifi = imo->imo_multicast_vif) < numvifs)) {
|
|
if (ip->ip_ttl < 255)
|
|
ip->ip_ttl++; /* compensate for -1 in *_send routines */
|
|
if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) {
|
|
struct vif *vifp = viftable + vifi;
|
|
|
|
printf("Sending IPPROTO_RSVP from %lx to %lx on vif %d (%s%s%d)\n",
|
|
(long)ntohl(ip->ip_src.s_addr), (long)ntohl(ip->ip_dst.s_addr),
|
|
vifi,
|
|
(vifp->v_flags & VIFF_TUNNEL) ? "tunnel on " : "",
|
|
vifp->v_ifp->if_name, vifp->v_ifp->if_unit);
|
|
}
|
|
return ip_mdq(m, ifp, NULL, vifi);
|
|
}
|
|
if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) {
|
|
printf("Warning: IPPROTO_RSVP from %lx to %lx without vif option\n",
|
|
(long)ntohl(ip->ip_src.s_addr), (long)ntohl(ip->ip_dst.s_addr));
|
|
if (!imo)
|
|
printf("In fact, no options were specified at all\n");
|
|
}
|
|
|
|
/*
|
|
* Don't forward a packet with time-to-live of zero or one,
|
|
* or a packet destined to a local-only group.
|
|
*/
|
|
if (ip->ip_ttl <= 1 || ntohl(ip->ip_dst.s_addr) <= INADDR_MAX_LOCAL_GROUP)
|
|
return 0;
|
|
|
|
/*
|
|
* Determine forwarding vifs from the forwarding cache table
|
|
*/
|
|
s = splnet();
|
|
++mrtstat.mrts_mfc_lookups;
|
|
rt = mfc_find(ip->ip_src.s_addr, ip->ip_dst.s_addr);
|
|
|
|
/* Entry exists, so forward if necessary */
|
|
if (rt != NULL) {
|
|
splx(s);
|
|
return ip_mdq(m, ifp, rt, -1);
|
|
} else {
|
|
/*
|
|
* If we don't have a route for packet's origin,
|
|
* Make a copy of the packet & send message to routing daemon
|
|
*/
|
|
|
|
struct mbuf *mb0;
|
|
struct rtdetq *rte;
|
|
u_long hash;
|
|
int hlen = ip->ip_hl << 2;
|
|
|
|
++mrtstat.mrts_mfc_misses;
|
|
|
|
mrtstat.mrts_no_route++;
|
|
if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC))
|
|
log(LOG_DEBUG, "ip_mforward: no rte s %lx g %lx\n",
|
|
(u_long)ntohl(ip->ip_src.s_addr),
|
|
(u_long)ntohl(ip->ip_dst.s_addr));
|
|
|
|
/*
|
|
* Allocate mbufs early so that we don't do extra work if we are
|
|
* just going to fail anyway. Make sure to pullup the header so
|
|
* that other people can't step on it.
|
|
*/
|
|
rte = (struct rtdetq *)malloc((sizeof *rte), M_MRTABLE, M_NOWAIT);
|
|
if (rte == NULL) {
|
|
splx(s);
|
|
return ENOBUFS;
|
|
}
|
|
mb0 = m_copy(m, 0, M_COPYALL);
|
|
if (mb0 && (M_HASCL(mb0) || mb0->m_len < hlen))
|
|
mb0 = m_pullup(mb0, hlen);
|
|
if (mb0 == NULL) {
|
|
free(rte, M_MRTABLE);
|
|
splx(s);
|
|
return ENOBUFS;
|
|
}
|
|
|
|
/* is there an upcall waiting for this flow ? */
|
|
hash = MFCHASH(ip->ip_src.s_addr, ip->ip_dst.s_addr);
|
|
for (rt = mfctable[hash]; rt; rt = rt->mfc_next) {
|
|
if ((ip->ip_src.s_addr == rt->mfc_origin.s_addr) &&
|
|
(ip->ip_dst.s_addr == rt->mfc_mcastgrp.s_addr) &&
|
|
(rt->mfc_stall != NULL))
|
|
break;
|
|
}
|
|
|
|
if (rt == NULL) {
|
|
int i;
|
|
struct igmpmsg *im;
|
|
struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
|
|
struct mbuf *mm;
|
|
|
|
/*
|
|
* Locate the vifi for the incoming interface for this packet.
|
|
* If none found, drop packet.
|
|
*/
|
|
for (vifi=0; vifi<numvifs && viftable[vifi].v_ifp != ifp; vifi++)
|
|
;
|
|
if (vifi >= numvifs) /* vif not found, drop packet */
|
|
goto non_fatal;
|
|
|
|
/* no upcall, so make a new entry */
|
|
rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT);
|
|
if (rt == NULL)
|
|
goto fail;
|
|
/* Make a copy of the header to send to the user level process */
|
|
mm = m_copy(mb0, 0, hlen);
|
|
if (mm == NULL)
|
|
goto fail1;
|
|
|
|
/*
|
|
* Send message to routing daemon to install
|
|
* a route into the kernel table
|
|
*/
|
|
|
|
im = mtod(mm, struct igmpmsg *);
|
|
im->im_msgtype = IGMPMSG_NOCACHE;
|
|
im->im_mbz = 0;
|
|
im->im_vif = vifi;
|
|
|
|
mrtstat.mrts_upcalls++;
|
|
|
|
k_igmpsrc.sin_addr = ip->ip_src;
|
|
if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) {
|
|
log(LOG_WARNING, "ip_mforward: ip_mrouter socket queue full\n");
|
|
++mrtstat.mrts_upq_sockfull;
|
|
fail1:
|
|
free(rt, M_MRTABLE);
|
|
fail:
|
|
free(rte, M_MRTABLE);
|
|
m_freem(mb0);
|
|
splx(s);
|
|
return ENOBUFS;
|
|
}
|
|
|
|
/* insert new entry at head of hash chain */
|
|
rt->mfc_origin.s_addr = ip->ip_src.s_addr;
|
|
rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr;
|
|
rt->mfc_expire = UPCALL_EXPIRE;
|
|
nexpire[hash]++;
|
|
for (i = 0; i < numvifs; i++)
|
|
rt->mfc_ttls[i] = 0;
|
|
rt->mfc_parent = -1;
|
|
|
|
/* link into table */
|
|
rt->mfc_next = mfctable[hash];
|
|
mfctable[hash] = rt;
|
|
rt->mfc_stall = rte;
|
|
|
|
} else {
|
|
/* determine if q has overflowed */
|
|
int npkts = 0;
|
|
struct rtdetq **p;
|
|
|
|
/*
|
|
* XXX ouch! we need to append to the list, but we
|
|
* only have a pointer to the front, so we have to
|
|
* scan the entire list every time.
|
|
*/
|
|
for (p = &rt->mfc_stall; *p != NULL; p = &(*p)->next)
|
|
npkts++;
|
|
|
|
if (npkts > MAX_UPQ) {
|
|
mrtstat.mrts_upq_ovflw++;
|
|
non_fatal:
|
|
free(rte, M_MRTABLE);
|
|
m_freem(mb0);
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
|
|
/* Add this entry to the end of the queue */
|
|
*p = rte;
|
|
}
|
|
|
|
rte->m = mb0;
|
|
rte->ifp = ifp;
|
|
rte->next = NULL;
|
|
|
|
splx(s);
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Clean up the cache entry if upcall is not serviced
|
|
*/
|
|
static void
|
|
expire_upcalls(void *unused)
|
|
{
|
|
struct rtdetq *rte;
|
|
struct mfc *mfc, **nptr;
|
|
int i;
|
|
int s;
|
|
|
|
s = splnet();
|
|
for (i = 0; i < MFCTBLSIZ; i++) {
|
|
if (nexpire[i] == 0)
|
|
continue;
|
|
nptr = &mfctable[i];
|
|
for (mfc = *nptr; mfc != NULL; mfc = *nptr) {
|
|
/*
|
|
* Skip real cache entries
|
|
* Make sure it wasn't marked to not expire (shouldn't happen)
|
|
* If it expires now
|
|
*/
|
|
if (mfc->mfc_stall != NULL && mfc->mfc_expire != 0 &&
|
|
--mfc->mfc_expire == 0) {
|
|
if (mrtdebug & DEBUG_EXPIRE)
|
|
log(LOG_DEBUG, "expire_upcalls: expiring (%lx %lx)\n",
|
|
(u_long)ntohl(mfc->mfc_origin.s_addr),
|
|
(u_long)ntohl(mfc->mfc_mcastgrp.s_addr));
|
|
/*
|
|
* drop all the packets
|
|
* free the mbuf with the pkt, if, timing info
|
|
*/
|
|
for (rte = mfc->mfc_stall; rte; ) {
|
|
struct rtdetq *n = rte->next;
|
|
|
|
m_freem(rte->m);
|
|
free(rte, M_MRTABLE);
|
|
rte = n;
|
|
}
|
|
++mrtstat.mrts_cache_cleanups;
|
|
nexpire[i]--;
|
|
|
|
*nptr = mfc->mfc_next;
|
|
free(mfc, M_MRTABLE);
|
|
} else {
|
|
nptr = &mfc->mfc_next;
|
|
}
|
|
}
|
|
}
|
|
splx(s);
|
|
expire_upcalls_ch = timeout(expire_upcalls, NULL, EXPIRE_TIMEOUT);
|
|
}
|
|
|
|
/*
|
|
* Packet forwarding routine once entry in the cache is made
|
|
*/
|
|
static int
|
|
ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt, vifi_t xmt_vif)
|
|
{
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
vifi_t vifi;
|
|
int plen = ip->ip_len;
|
|
|
|
/*
|
|
* Macro to send packet on vif. Since RSVP packets don't get counted on
|
|
* input, they shouldn't get counted on output, so statistics keeping is
|
|
* separate.
|
|
*/
|
|
#define MC_SEND(ip,vifp,m) { \
|
|
if ((vifp)->v_flags & VIFF_TUNNEL) \
|
|
encap_send((ip), (vifp), (m)); \
|
|
else \
|
|
phyint_send((ip), (vifp), (m)); \
|
|
}
|
|
|
|
/*
|
|
* If xmt_vif is not -1, send on only the requested vif.
|
|
*
|
|
* (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.)
|
|
*/
|
|
if (xmt_vif < numvifs) {
|
|
MC_SEND(ip, viftable + xmt_vif, m);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Don't forward if it didn't arrive from the parent vif for its origin.
|
|
*/
|
|
vifi = rt->mfc_parent;
|
|
if ((vifi >= numvifs) || (viftable[vifi].v_ifp != ifp)) {
|
|
/* came in the wrong interface */
|
|
if (mrtdebug & DEBUG_FORWARD)
|
|
log(LOG_DEBUG, "wrong if: ifp %p vifi %d vififp %p\n",
|
|
(void *)ifp, vifi, (void *)viftable[vifi].v_ifp);
|
|
++mrtstat.mrts_wrong_if;
|
|
++rt->mfc_wrong_if;
|
|
/*
|
|
* If we are doing PIM assert processing, and we are forwarding
|
|
* packets on this interface, and it is a broadcast medium
|
|
* interface (and not a tunnel), send a message to the routing daemon.
|
|
*/
|
|
if (pim_assert && rt->mfc_ttls[vifi] &&
|
|
(ifp->if_flags & IFF_BROADCAST) &&
|
|
!(viftable[vifi].v_flags & VIFF_TUNNEL)) {
|
|
struct timeval now;
|
|
u_long delta;
|
|
|
|
GET_TIME(now);
|
|
|
|
TV_DELTA(rt->mfc_last_assert, now, delta);
|
|
|
|
if (delta > ASSERT_MSG_TIME) {
|
|
struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
|
|
struct igmpmsg *im;
|
|
int hlen = ip->ip_hl << 2;
|
|
struct mbuf *mm = m_copy(m, 0, hlen);
|
|
|
|
if (mm && (M_HASCL(mm) || mm->m_len < hlen))
|
|
mm = m_pullup(mm, hlen);
|
|
if (mm == NULL)
|
|
return ENOBUFS;
|
|
|
|
rt->mfc_last_assert = now;
|
|
|
|
im = mtod(mm, struct igmpmsg *);
|
|
im->im_msgtype = IGMPMSG_WRONGVIF;
|
|
im->im_mbz = 0;
|
|
im->im_vif = vifi;
|
|
|
|
k_igmpsrc.sin_addr = im->im_src;
|
|
|
|
if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) {
|
|
log(LOG_WARNING,
|
|
"ip_mforward: ip_mrouter socket queue full\n");
|
|
++mrtstat.mrts_upq_sockfull;
|
|
return ENOBUFS;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* If I sourced this packet, it counts as output, else it was input. */
|
|
if (ip->ip_src.s_addr == viftable[vifi].v_lcl_addr.s_addr) {
|
|
viftable[vifi].v_pkt_out++;
|
|
viftable[vifi].v_bytes_out += plen;
|
|
} else {
|
|
viftable[vifi].v_pkt_in++;
|
|
viftable[vifi].v_bytes_in += plen;
|
|
}
|
|
rt->mfc_pkt_cnt++;
|
|
rt->mfc_byte_cnt += plen;
|
|
|
|
/*
|
|
* For each vif, decide if a copy of the packet should be forwarded.
|
|
* Forward if:
|
|
* - the ttl exceeds the vif's threshold
|
|
* - there are group members downstream on interface
|
|
*/
|
|
for (vifi = 0; vifi < numvifs; vifi++)
|
|
if ((rt->mfc_ttls[vifi] > 0) && (ip->ip_ttl > rt->mfc_ttls[vifi])) {
|
|
viftable[vifi].v_pkt_out++;
|
|
viftable[vifi].v_bytes_out += plen;
|
|
MC_SEND(ip, viftable+vifi, m);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* check if a vif number is legal/ok. This is used by ip_output.
|
|
*/
|
|
static int
|
|
X_legal_vif_num(int vif)
|
|
{
|
|
return (vif >= 0 && vif < numvifs);
|
|
}
|
|
|
|
/*
|
|
* Return the local address used by this vif
|
|
*/
|
|
static u_long
|
|
X_ip_mcast_src(int vifi)
|
|
{
|
|
if (vifi >= 0 && vifi < numvifs)
|
|
return viftable[vifi].v_lcl_addr.s_addr;
|
|
else
|
|
return INADDR_ANY;
|
|
}
|
|
|
|
static void
|
|
phyint_send(struct ip *ip, struct vif *vifp, struct mbuf *m)
|
|
{
|
|
struct mbuf *mb_copy;
|
|
int hlen = ip->ip_hl << 2;
|
|
|
|
/*
|
|
* Make a new reference to the packet; make sure that
|
|
* the IP header is actually copied, not just referenced,
|
|
* so that ip_output() only scribbles on the copy.
|
|
*/
|
|
mb_copy = m_copy(m, 0, M_COPYALL);
|
|
if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen))
|
|
mb_copy = m_pullup(mb_copy, hlen);
|
|
if (mb_copy == NULL)
|
|
return;
|
|
|
|
if (vifp->v_rate_limit == 0)
|
|
tbf_send_packet(vifp, mb_copy);
|
|
else
|
|
tbf_control(vifp, mb_copy, mtod(mb_copy, struct ip *), ip->ip_len);
|
|
}
|
|
|
|
static void
|
|
encap_send(struct ip *ip, struct vif *vifp, struct mbuf *m)
|
|
{
|
|
struct mbuf *mb_copy;
|
|
struct ip *ip_copy;
|
|
int i, len = ip->ip_len;
|
|
|
|
/*
|
|
* XXX: take care of delayed checksums.
|
|
* XXX: if network interfaces are capable of computing checksum for
|
|
* encapsulated multicast data packets, we need to reconsider this.
|
|
*/
|
|
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
|
|
in_delayed_cksum(m);
|
|
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
|
|
}
|
|
|
|
/*
|
|
* copy the old packet & pullup its IP header into the
|
|
* new mbuf so we can modify it. Try to fill the new
|
|
* mbuf since if we don't the ethernet driver will.
|
|
*/
|
|
MGETHDR(mb_copy, M_DONTWAIT, MT_HEADER);
|
|
if (mb_copy == NULL)
|
|
return;
|
|
#ifdef MAC
|
|
mac_create_mbuf_multicast_encap(m, vifp->v_ifp, mb_copy);
|
|
#endif
|
|
mb_copy->m_data += max_linkhdr;
|
|
mb_copy->m_len = sizeof(multicast_encap_iphdr);
|
|
|
|
if ((mb_copy->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
|
|
m_freem(mb_copy);
|
|
return;
|
|
}
|
|
i = MHLEN - M_LEADINGSPACE(mb_copy);
|
|
if (i > len)
|
|
i = len;
|
|
mb_copy = m_pullup(mb_copy, i);
|
|
if (mb_copy == NULL)
|
|
return;
|
|
mb_copy->m_pkthdr.len = len + sizeof(multicast_encap_iphdr);
|
|
|
|
/*
|
|
* fill in the encapsulating IP header.
|
|
*/
|
|
ip_copy = mtod(mb_copy, struct ip *);
|
|
*ip_copy = multicast_encap_iphdr;
|
|
#ifdef RANDOM_IP_ID
|
|
ip_copy->ip_id = ip_randomid();
|
|
#else
|
|
ip_copy->ip_id = htons(ip_id++);
|
|
#endif
|
|
ip_copy->ip_len += len;
|
|
ip_copy->ip_src = vifp->v_lcl_addr;
|
|
ip_copy->ip_dst = vifp->v_rmt_addr;
|
|
|
|
/*
|
|
* turn the encapsulated IP header back into a valid one.
|
|
*/
|
|
ip = (struct ip *)((caddr_t)ip_copy + sizeof(multicast_encap_iphdr));
|
|
--ip->ip_ttl;
|
|
ip->ip_len = htons(ip->ip_len);
|
|
ip->ip_off = htons(ip->ip_off);
|
|
ip->ip_sum = 0;
|
|
mb_copy->m_data += sizeof(multicast_encap_iphdr);
|
|
ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2);
|
|
mb_copy->m_data -= sizeof(multicast_encap_iphdr);
|
|
|
|
if (vifp->v_rate_limit == 0)
|
|
tbf_send_packet(vifp, mb_copy);
|
|
else
|
|
tbf_control(vifp, mb_copy, ip, ip_copy->ip_len);
|
|
}
|
|
|
|
/*
|
|
* Token bucket filter module
|
|
*/
|
|
|
|
static void
|
|
tbf_control(struct vif *vifp, struct mbuf *m, struct ip *ip, u_long p_len)
|
|
{
|
|
struct tbf *t = vifp->v_tbf;
|
|
|
|
if (p_len > MAX_BKT_SIZE) { /* drop if packet is too large */
|
|
mrtstat.mrts_pkt2large++;
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
tbf_update_tokens(vifp);
|
|
|
|
if (t->tbf_q_len == 0) { /* queue empty... */
|
|
if (p_len <= t->tbf_n_tok) { /* send packet if enough tokens */
|
|
t->tbf_n_tok -= p_len;
|
|
tbf_send_packet(vifp, m);
|
|
} else { /* no, queue packet and try later */
|
|
tbf_queue(vifp, m);
|
|
timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS);
|
|
}
|
|
} else if (t->tbf_q_len < t->tbf_max_q_len) {
|
|
/* finite queue length, so queue pkts and process queue */
|
|
tbf_queue(vifp, m);
|
|
tbf_process_q(vifp);
|
|
} else {
|
|
/* queue full, try to dq and queue and process */
|
|
if (!tbf_dq_sel(vifp, ip)) {
|
|
mrtstat.mrts_q_overflow++;
|
|
m_freem(m);
|
|
} else {
|
|
tbf_queue(vifp, m);
|
|
tbf_process_q(vifp);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* adds a packet to the queue at the interface
|
|
*/
|
|
static void
|
|
tbf_queue(struct vif *vifp, struct mbuf *m)
|
|
{
|
|
int s = splnet();
|
|
struct tbf *t = vifp->v_tbf;
|
|
|
|
if (t->tbf_t == NULL) /* Queue was empty */
|
|
t->tbf_q = m;
|
|
else /* Insert at tail */
|
|
t->tbf_t->m_act = m;
|
|
|
|
t->tbf_t = m; /* Set new tail pointer */
|
|
|
|
#ifdef DIAGNOSTIC
|
|
/* Make sure we didn't get fed a bogus mbuf */
|
|
if (m->m_act)
|
|
panic("tbf_queue: m_act");
|
|
#endif
|
|
m->m_act = NULL;
|
|
|
|
t->tbf_q_len++;
|
|
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* processes the queue at the interface
|
|
*/
|
|
static void
|
|
tbf_process_q(struct vif *vifp)
|
|
{
|
|
int s = splnet();
|
|
struct tbf *t = vifp->v_tbf;
|
|
|
|
/* loop through the queue at the interface and send as many packets
|
|
* as possible
|
|
*/
|
|
while (t->tbf_q_len > 0) {
|
|
struct mbuf *m = t->tbf_q;
|
|
int len = mtod(m, struct ip *)->ip_len;
|
|
|
|
/* determine if the packet can be sent */
|
|
if (len > t->tbf_n_tok) /* not enough tokens, we are done */
|
|
break;
|
|
/* ok, reduce no of tokens, dequeue and send the packet. */
|
|
t->tbf_n_tok -= len;
|
|
|
|
t->tbf_q = m->m_act;
|
|
if (--t->tbf_q_len == 0)
|
|
t->tbf_t = NULL;
|
|
|
|
m->m_act = NULL;
|
|
tbf_send_packet(vifp, m);
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
static void
|
|
tbf_reprocess_q(void *xvifp)
|
|
{
|
|
struct vif *vifp = xvifp;
|
|
|
|
if (ip_mrouter == NULL)
|
|
return;
|
|
tbf_update_tokens(vifp);
|
|
tbf_process_q(vifp);
|
|
if (vifp->v_tbf->tbf_q_len)
|
|
timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS);
|
|
}
|
|
|
|
/* function that will selectively discard a member of the queue
|
|
* based on the precedence value and the priority
|
|
*/
|
|
static int
|
|
tbf_dq_sel(struct vif *vifp, struct ip *ip)
|
|
{
|
|
int s = splnet();
|
|
u_int p;
|
|
struct mbuf *m, *last;
|
|
struct mbuf **np;
|
|
struct tbf *t = vifp->v_tbf;
|
|
|
|
p = priority(vifp, ip);
|
|
|
|
np = &t->tbf_q;
|
|
last = NULL;
|
|
while ((m = *np) != NULL) {
|
|
if (p > priority(vifp, mtod(m, struct ip *))) {
|
|
*np = m->m_act;
|
|
/* If we're removing the last packet, fix the tail pointer */
|
|
if (m == t->tbf_t)
|
|
t->tbf_t = last;
|
|
m_freem(m);
|
|
/* It's impossible for the queue to be empty, but check anyways. */
|
|
if (--t->tbf_q_len == 0)
|
|
t->tbf_t = NULL;
|
|
splx(s);
|
|
mrtstat.mrts_drop_sel++;
|
|
return 1;
|
|
}
|
|
np = &m->m_act;
|
|
last = m;
|
|
}
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
tbf_send_packet(struct vif *vifp, struct mbuf *m)
|
|
{
|
|
int s = splnet();
|
|
|
|
if (vifp->v_flags & VIFF_TUNNEL) /* If tunnel options */
|
|
ip_output(m, NULL, &vifp->v_route, IP_FORWARDING, NULL, NULL);
|
|
else {
|
|
struct ip_moptions imo;
|
|
int error;
|
|
static struct route ro; /* XXX check this */
|
|
|
|
imo.imo_multicast_ifp = vifp->v_ifp;
|
|
imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1;
|
|
imo.imo_multicast_loop = 1;
|
|
imo.imo_multicast_vif = -1;
|
|
|
|
/*
|
|
* Re-entrancy should not be a problem here, because
|
|
* the packets that we send out and are looped back at us
|
|
* should get rejected because they appear to come from
|
|
* the loopback interface, thus preventing looping.
|
|
*/
|
|
error = ip_output(m, NULL, &ro, IP_FORWARDING, &imo, NULL);
|
|
|
|
if (mrtdebug & DEBUG_XMIT)
|
|
log(LOG_DEBUG, "phyint_send on vif %d err %d\n",
|
|
(int)(vifp - viftable), error);
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
/* determine the current time and then
|
|
* the elapsed time (between the last time and time now)
|
|
* in milliseconds & update the no. of tokens in the bucket
|
|
*/
|
|
static void
|
|
tbf_update_tokens(struct vif *vifp)
|
|
{
|
|
struct timeval tp;
|
|
u_long tm;
|
|
int s = splnet();
|
|
struct tbf *t = vifp->v_tbf;
|
|
|
|
GET_TIME(tp);
|
|
|
|
TV_DELTA(tp, t->tbf_last_pkt_t, tm);
|
|
|
|
/*
|
|
* This formula is actually
|
|
* "time in seconds" * "bytes/second".
|
|
*
|
|
* (tm / 1000000) * (v_rate_limit * 1000 * (1000/1024) / 8)
|
|
*
|
|
* The (1000/1024) was introduced in add_vif to optimize
|
|
* this divide into a shift.
|
|
*/
|
|
t->tbf_n_tok += tm * vifp->v_rate_limit / 1024 / 8;
|
|
t->tbf_last_pkt_t = tp;
|
|
|
|
if (t->tbf_n_tok > MAX_BKT_SIZE)
|
|
t->tbf_n_tok = MAX_BKT_SIZE;
|
|
|
|
splx(s);
|
|
}
|
|
|
|
static int
|
|
priority(struct vif *vifp, struct ip *ip)
|
|
{
|
|
int prio = 50; /* the lowest priority -- default case */
|
|
|
|
/* temporary hack; may add general packet classifier some day */
|
|
|
|
/*
|
|
* The UDP port space is divided up into four priority ranges:
|
|
* [0, 16384) : unclassified - lowest priority
|
|
* [16384, 32768) : audio - highest priority
|
|
* [32768, 49152) : whiteboard - medium priority
|
|
* [49152, 65536) : video - low priority
|
|
*
|
|
* Everything else gets lowest priority.
|
|
*/
|
|
if (ip->ip_p == IPPROTO_UDP) {
|
|
struct udphdr *udp = (struct udphdr *)(((char *)ip) + (ip->ip_hl << 2));
|
|
switch (ntohs(udp->uh_dport) & 0xc000) {
|
|
case 0x4000:
|
|
prio = 70;
|
|
break;
|
|
case 0x8000:
|
|
prio = 60;
|
|
break;
|
|
case 0xc000:
|
|
prio = 55;
|
|
break;
|
|
}
|
|
}
|
|
return prio;
|
|
}
|
|
|
|
/*
|
|
* End of token bucket filter modifications
|
|
*/
|
|
|
|
static int
|
|
X_ip_rsvp_vif(struct socket *so, struct sockopt *sopt)
|
|
{
|
|
int error, vifi, s;
|
|
|
|
if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP)
|
|
return EOPNOTSUPP;
|
|
|
|
error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi);
|
|
if (error)
|
|
return error;
|
|
|
|
s = splnet();
|
|
|
|
if (vifi < 0 || vifi >= numvifs) { /* Error if vif is invalid */
|
|
splx(s);
|
|
return EADDRNOTAVAIL;
|
|
}
|
|
|
|
if (sopt->sopt_name == IP_RSVP_VIF_ON) {
|
|
/* Check if socket is available. */
|
|
if (viftable[vifi].v_rsvpd != NULL) {
|
|
splx(s);
|
|
return EADDRINUSE;
|
|
}
|
|
|
|
viftable[vifi].v_rsvpd = so;
|
|
/* This may seem silly, but we need to be sure we don't over-increment
|
|
* the RSVP counter, in case something slips up.
|
|
*/
|
|
if (!viftable[vifi].v_rsvp_on) {
|
|
viftable[vifi].v_rsvp_on = 1;
|
|
rsvp_on++;
|
|
}
|
|
} else { /* must be VIF_OFF */
|
|
/*
|
|
* XXX as an additional consistency check, one could make sure
|
|
* that viftable[vifi].v_rsvpd == so, otherwise passing so as
|
|
* first parameter is pretty useless.
|
|
*/
|
|
viftable[vifi].v_rsvpd = NULL;
|
|
/*
|
|
* This may seem silly, but we need to be sure we don't over-decrement
|
|
* the RSVP counter, in case something slips up.
|
|
*/
|
|
if (viftable[vifi].v_rsvp_on) {
|
|
viftable[vifi].v_rsvp_on = 0;
|
|
rsvp_on--;
|
|
}
|
|
}
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
X_ip_rsvp_force_done(struct socket *so)
|
|
{
|
|
int vifi;
|
|
int s;
|
|
|
|
/* Don't bother if it is not the right type of socket. */
|
|
if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP)
|
|
return;
|
|
|
|
s = splnet();
|
|
|
|
/* The socket may be attached to more than one vif...this
|
|
* is perfectly legal.
|
|
*/
|
|
for (vifi = 0; vifi < numvifs; vifi++) {
|
|
if (viftable[vifi].v_rsvpd == so) {
|
|
viftable[vifi].v_rsvpd = NULL;
|
|
/* This may seem silly, but we need to be sure we don't
|
|
* over-decrement the RSVP counter, in case something slips up.
|
|
*/
|
|
if (viftable[vifi].v_rsvp_on) {
|
|
viftable[vifi].v_rsvp_on = 0;
|
|
rsvp_on--;
|
|
}
|
|
}
|
|
}
|
|
|
|
splx(s);
|
|
}
|
|
|
|
static void
|
|
X_rsvp_input(struct mbuf *m, int off)
|
|
{
|
|
int vifi;
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
struct sockaddr_in rsvp_src = { sizeof rsvp_src, AF_INET };
|
|
int s;
|
|
struct ifnet *ifp;
|
|
|
|
if (rsvpdebug)
|
|
printf("rsvp_input: rsvp_on %d\n",rsvp_on);
|
|
|
|
/* Can still get packets with rsvp_on = 0 if there is a local member
|
|
* of the group to which the RSVP packet is addressed. But in this
|
|
* case we want to throw the packet away.
|
|
*/
|
|
if (!rsvp_on) {
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
s = splnet();
|
|
|
|
if (rsvpdebug)
|
|
printf("rsvp_input: check vifs\n");
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (!(m->m_flags & M_PKTHDR))
|
|
panic("rsvp_input no hdr");
|
|
#endif
|
|
|
|
ifp = m->m_pkthdr.rcvif;
|
|
/* Find which vif the packet arrived on. */
|
|
for (vifi = 0; vifi < numvifs; vifi++)
|
|
if (viftable[vifi].v_ifp == ifp)
|
|
break;
|
|
|
|
if (vifi == numvifs || viftable[vifi].v_rsvpd == NULL) {
|
|
/*
|
|
* If the old-style non-vif-associated socket is set,
|
|
* then use it. Otherwise, drop packet since there
|
|
* is no specific socket for this vif.
|
|
*/
|
|
if (ip_rsvpd != NULL) {
|
|
if (rsvpdebug)
|
|
printf("rsvp_input: Sending packet up old-style socket\n");
|
|
rip_input(m, off); /* xxx */
|
|
} else {
|
|
if (rsvpdebug && vifi == numvifs)
|
|
printf("rsvp_input: Can't find vif for packet.\n");
|
|
else if (rsvpdebug && viftable[vifi].v_rsvpd == NULL)
|
|
printf("rsvp_input: No socket defined for vif %d\n",vifi);
|
|
m_freem(m);
|
|
}
|
|
splx(s);
|
|
return;
|
|
}
|
|
rsvp_src.sin_addr = ip->ip_src;
|
|
|
|
if (rsvpdebug && m)
|
|
printf("rsvp_input: m->m_len = %d, sbspace() = %ld\n",
|
|
m->m_len,sbspace(&(viftable[vifi].v_rsvpd->so_rcv)));
|
|
|
|
if (socket_send(viftable[vifi].v_rsvpd, m, &rsvp_src) < 0) {
|
|
if (rsvpdebug)
|
|
printf("rsvp_input: Failed to append to socket\n");
|
|
} else {
|
|
if (rsvpdebug)
|
|
printf("rsvp_input: send packet up\n");
|
|
}
|
|
|
|
splx(s);
|
|
}
|
|
|
|
static int
|
|
ip_mroute_modevent(module_t mod, int type, void *unused)
|
|
{
|
|
int s;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
s = splnet();
|
|
/* XXX Protect against multiple loading */
|
|
ip_mcast_src = X_ip_mcast_src;
|
|
ip_mforward = X_ip_mforward;
|
|
ip_mrouter_done = X_ip_mrouter_done;
|
|
ip_mrouter_get = X_ip_mrouter_get;
|
|
ip_mrouter_set = X_ip_mrouter_set;
|
|
ip_rsvp_force_done = X_ip_rsvp_force_done;
|
|
ip_rsvp_vif = X_ip_rsvp_vif;
|
|
legal_vif_num = X_legal_vif_num;
|
|
mrt_ioctl = X_mrt_ioctl;
|
|
rsvp_input_p = X_rsvp_input;
|
|
splx(s);
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
if (ip_mrouter)
|
|
return EINVAL;
|
|
|
|
s = splnet();
|
|
ip_mcast_src = NULL;
|
|
ip_mforward = NULL;
|
|
ip_mrouter_done = NULL;
|
|
ip_mrouter_get = NULL;
|
|
ip_mrouter_set = NULL;
|
|
ip_rsvp_force_done = NULL;
|
|
ip_rsvp_vif = NULL;
|
|
legal_vif_num = NULL;
|
|
mrt_ioctl = NULL;
|
|
rsvp_input_p = NULL;
|
|
splx(s);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static moduledata_t ip_mroutemod = {
|
|
"ip_mroute",
|
|
ip_mroute_modevent,
|
|
0
|
|
};
|
|
DECLARE_MODULE(ip_mroute, ip_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|