/* $NetBSD: ip_mroute.c,v 1.165 2022/03/15 21:39:59 andvar Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Stephen Deering of Stanford University. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 */ /* * Copyright (c) 1989 Stephen Deering * * This code is derived from software contributed to Berkeley by * Stephen Deering of Stanford University. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 */ /* * IP multicast forwarding procedures * * Written by David Waitzman, BBN Labs, August 1988. * Modified by Steve Deering, Stanford, February 1989. * Modified by Mark J. Steiglitz, Stanford, May, 1991 * Modified by Van Jacobson, LBL, January 1993 * Modified by Ajit Thyagarajan, PARC, August 1993 * Modified by Bill Fenner, PARC, April 1994 * Modified by Charles M. Hannum, NetBSD, May 1995. * Modified by Ahmed Helmy, SGI, June 1996 * Modified by George Edmond Eddy (Rusty), ISI, February 1998 * Modified by Pavlin Radoslavov, USC/ISI, May 1998, August 1999, October 2000 * Modified by Hitoshi Asaeda, WIDE, August 2000 * Modified by Pavlin Radoslavov, ICSI, October 2002 * * MROUTING Revision: 1.2 * and PIM-SMv2 and PIM-DM support, advanced API support, * bandwidth metering and signaling */ #include __KERNEL_RCSID(0, "$NetBSD: ip_mroute.c,v 1.165 2022/03/15 21:39:59 andvar Exp $"); #ifdef _KERNEL_OPT #include "opt_inet.h" #include "opt_ipsec.h" #include "opt_pim.h" #endif #ifdef PIM #define _PIM_VT 1 #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef PIM #include #include #endif #include #ifdef IPSEC #include #include #endif #define IP_MULTICASTOPTS 0 #define M_PULLUP(m, len) \ do { \ if ((m) && ((m)->m_flags & M_EXT || (m)->m_len < (len))) \ (m) = m_pullup((m), (len)); \ } while (/*CONSTCOND*/ 0) /* * Globals. All but ip_mrouter and ip_mrtproto could be static, * except for netstat or debugging purposes. */ struct socket *ip_mrouter = NULL; int ip_mrtproto = IGMP_DVMRP; /* for netstat only */ #define MFCHASH(a, g) \ ((((a).s_addr >> 20) ^ ((a).s_addr >> 10) ^ (a).s_addr ^ \ ((g).s_addr >> 20) ^ ((g).s_addr >> 10) ^ (g).s_addr) & mfchash) LIST_HEAD(mfchashhdr, mfc) *mfchashtbl; u_long mfchash; u_char nexpire[MFCTBLSIZ]; struct vif viftable[MAXVIFS]; struct mrtstat mrtstat; u_int mrtdebug = 0; /* debug level */ #define DEBUG_MFC 0x02 #define DEBUG_FORWARD 0x04 #define DEBUG_EXPIRE 0x08 #define DEBUG_XMIT 0x10 #define DEBUG_PIM 0x20 #define VIFI_INVALID ((vifi_t) -1) u_int tbfdebug = 0; /* tbf debug level */ /* vif attachment using sys/netinet/ip_encap.c */ static void vif_input(struct mbuf *, int, int, void *); static int vif_encapcheck(struct mbuf *, int, int, void *); static const struct encapsw vif_encapsw = { .encapsw4 = { .pr_input = vif_input, .pr_ctlinput = NULL, } }; #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ #define UPCALL_EXPIRE 6 /* number of timeouts */ /* * Define the token bucket filter structures */ #define TBF_REPROCESS (hz / 100) /* 100x / second */ static int get_sg_cnt(struct sioc_sg_req *); static int get_vif_cnt(struct sioc_vif_req *); static int ip_mrouter_init(struct socket *, int); static int set_assert(int); static int add_vif(struct vifctl *); static int del_vif(vifi_t *); static void update_mfc_params(struct mfc *, struct mfcctl2 *); static void init_mfc_params(struct mfc *, struct mfcctl2 *); static void expire_mfc(struct mfc *); static int add_mfc(struct sockopt *); #ifdef UPCALL_TIMING static void collate(struct timeval *); #endif static int del_mfc(struct sockopt *); static int set_api_config(struct sockopt *); /* chose API capabilities */ static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in *); static void expire_upcalls(void *); static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *); static void phyint_send(struct ip *, struct vif *, struct mbuf *); static void encap_send(struct ip *, struct vif *, struct mbuf *); static void tbf_control(struct vif *, struct mbuf *, struct ip *, u_int32_t); static void tbf_queue(struct vif *, struct mbuf *); static void tbf_process_q(struct vif *); static void tbf_reprocess_q(void *); static int tbf_dq_sel(struct vif *, struct ip *); static void tbf_send_packet(struct vif *, struct mbuf *); static void tbf_update_tokens(struct vif *); static int priority(struct vif *, struct ip *); static int ip_mforward_real(struct mbuf *, struct ifnet *); /* * Bandwidth monitoring */ static void free_bw_list(struct bw_meter *); static int add_bw_upcall(struct bw_upcall *); static int del_bw_upcall(struct bw_upcall *); static void bw_meter_receive_packet(struct bw_meter *, int , struct timeval *); static void bw_meter_prepare_upcall(struct bw_meter *, struct timeval *); static void bw_upcalls_send(void); static void schedule_bw_meter(struct bw_meter *, struct timeval *); static void unschedule_bw_meter(struct bw_meter *); static void bw_meter_process(void); static void expire_bw_upcalls_send(void *); static void expire_bw_meter_process(void *); #ifdef PIM static int pim_register_send(struct ip *, struct vif *, struct mbuf *, struct mfc *); static int pim_register_send_rp(struct ip *, struct vif *, struct mbuf *, struct mfc *); static int pim_register_send_upcall(struct ip *, struct vif *, struct mbuf *, struct mfc *); static struct mbuf *pim_register_prepare(struct ip *, struct mbuf *); #endif #define ENCAP_TTL 64 #define ENCAP_PROTO IPPROTO_IPIP /* prototype IP hdr for encapsulated packets */ static const struct ip multicast_encap_iphdr = { .ip_hl = sizeof(struct ip) >> 2, .ip_v = IPVERSION, .ip_len = sizeof(struct ip), .ip_ttl = ENCAP_TTL, .ip_p = ENCAP_PROTO, }; /* * Bandwidth meter variables and constants */ /* * Pending timeouts are stored in a hash table, the key being the * expiration time. Periodically, the entries are analysed and processed. */ #define BW_METER_BUCKETS 1024 static struct bw_meter *bw_meter_timers[BW_METER_BUCKETS]; struct callout bw_meter_ch; #define BW_METER_PERIOD (hz) /* periodical handling of bw meters */ /* * Pending upcalls are stored in a vector which is flushed when * full, or periodically */ static struct bw_upcall bw_upcalls[BW_UPCALLS_MAX]; static u_int bw_upcalls_n; /* # of pending upcalls */ struct callout bw_upcalls_ch; #define BW_UPCALLS_PERIOD (hz) /* periodical flush of bw upcalls */ #ifdef PIM struct pimstat pimstat; /* * Note: the PIM Register encapsulation adds the following in front of a * data packet: * * struct pim_encap_hdr { * struct ip ip; * struct pim_encap_pimhdr pim; * } */ struct pim_encap_pimhdr { struct pim pim; uint32_t flags; }; static struct ip pim_encap_iphdr = { .ip_v = IPVERSION, .ip_hl = sizeof(struct ip) >> 2, .ip_len = sizeof(struct ip), .ip_ttl = ENCAP_TTL, .ip_p = IPPROTO_PIM, }; static struct pim_encap_pimhdr pim_encap_pimhdr = { { PIM_MAKE_VT(PIM_VERSION, PIM_REGISTER), /* PIM vers and message type */ 0, /* reserved */ 0, /* checksum */ }, 0 /* flags */ }; static struct ifnet multicast_register_if; static vifi_t reg_vif_num = VIFI_INVALID; #endif /* PIM */ /* * Private variables. */ static vifi_t numvifs = 0; static struct callout expire_upcalls_ch; /* * whether or not special PIM assert processing is enabled. */ static int pim_assert; /* * Rate limit for assert notification messages, in usec */ #define ASSERT_MSG_TIME 3000000 /* * Kernel multicast routing API capabilities and setup. * If more API capabilities are added to the kernel, they should be * recorded in `mrt_api_support'. */ static const u_int32_t mrt_api_support = (MRT_MFC_FLAGS_DISABLE_WRONGVIF | MRT_MFC_FLAGS_BORDER_VIF | MRT_MFC_RP | MRT_MFC_BW_UPCALL); static u_int32_t mrt_api_config = 0; /* * Find a route for a given origin IP address and Multicast group address * Type of service parameter to be added in the future!!! * Statistics are updated by the caller if needed * (mrtstat.mrts_mfc_lookups and mrtstat.mrts_mfc_misses) */ static struct mfc * mfc_find(struct in_addr *o, struct in_addr *g) { struct mfc *rt; LIST_FOREACH(rt, &mfchashtbl[MFCHASH(*o, *g)], mfc_hash) { if (in_hosteq(rt->mfc_origin, *o) && in_hosteq(rt->mfc_mcastgrp, *g) && (rt->mfc_stall == NULL)) break; } return rt; } /* * Macros to compute elapsed time efficiently * Borrowed from Van Jacobson's scheduling code */ #define TV_DELTA(a, b, delta) do { \ int xxs; \ delta = (a).tv_usec - (b).tv_usec; \ xxs = (a).tv_sec - (b).tv_sec; \ switch (xxs) { \ case 2: \ delta += 1000000; \ /* fall through */ \ case 1: \ delta += 1000000; \ /* fall through */ \ case 0: \ break; \ default: \ delta += (1000000 * xxs); \ break; \ } \ } while (/*CONSTCOND*/ 0) #ifdef UPCALL_TIMING u_int32_t upcall_data[51]; #endif /* UPCALL_TIMING */ /* * Handle MRT setsockopt commands to modify the multicast routing tables. */ int ip_mrouter_set(struct socket *so, struct sockopt *sopt) { int error; int optval; struct vifctl vifc; vifi_t vifi; struct bw_upcall bwuc; if (sopt->sopt_name != MRT_INIT && so != ip_mrouter) error = ENOPROTOOPT; else { switch (sopt->sopt_name) { case MRT_INIT: error = sockopt_getint(sopt, &optval); if (error) break; error = ip_mrouter_init(so, optval); break; case MRT_DONE: error = ip_mrouter_done(); break; case MRT_ADD_VIF: error = sockopt_get(sopt, &vifc, sizeof(vifc)); if (error) break; error = add_vif(&vifc); break; case MRT_DEL_VIF: error = sockopt_get(sopt, &vifi, sizeof(vifi)); if (error) break; error = del_vif(&vifi); break; case MRT_ADD_MFC: error = add_mfc(sopt); break; case MRT_DEL_MFC: error = del_mfc(sopt); break; case MRT_ASSERT: error = sockopt_getint(sopt, &optval); if (error) break; error = set_assert(optval); break; case MRT_API_CONFIG: error = set_api_config(sopt); break; case MRT_ADD_BW_UPCALL: error = sockopt_get(sopt, &bwuc, sizeof(bwuc)); if (error) break; error = add_bw_upcall(&bwuc); break; case MRT_DEL_BW_UPCALL: error = sockopt_get(sopt, &bwuc, sizeof(bwuc)); if (error) break; error = del_bw_upcall(&bwuc); break; default: error = ENOPROTOOPT; break; } } return error; } /* * Handle MRT getsockopt commands */ int ip_mrouter_get(struct socket *so, struct sockopt *sopt) { int error; if (so != ip_mrouter) error = ENOPROTOOPT; else { switch (sopt->sopt_name) { case MRT_VERSION: error = sockopt_setint(sopt, 0x0305); /* XXX !!!! */ break; case MRT_ASSERT: error = sockopt_setint(sopt, pim_assert); break; case MRT_API_SUPPORT: error = sockopt_set(sopt, &mrt_api_support, sizeof(mrt_api_support)); break; case MRT_API_CONFIG: error = sockopt_set(sopt, &mrt_api_config, sizeof(mrt_api_config)); break; default: error = ENOPROTOOPT; break; } } return error; } /* * Handle ioctl commands to obtain information from the cache */ int mrt_ioctl(struct socket *so, u_long cmd, void *data) { int error; if (so != ip_mrouter) error = EINVAL; else switch (cmd) { case SIOCGETVIFCNT: error = get_vif_cnt((struct sioc_vif_req *)data); break; case SIOCGETSGCNT: error = get_sg_cnt((struct sioc_sg_req *)data); break; default: error = EINVAL; break; } return error; } /* * returns the packet, byte, rpf-failure count for the source group provided */ static int get_sg_cnt(struct sioc_sg_req *req) { int s; struct mfc *rt; s = splsoftnet(); rt = mfc_find(&req->src, &req->grp); if (rt == NULL) { splx(s); req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; return EADDRNOTAVAIL; } req->pktcnt = rt->mfc_pkt_cnt; req->bytecnt = rt->mfc_byte_cnt; req->wrong_if = rt->mfc_wrong_if; splx(s); return 0; } /* * returns the input and output packet and byte counts on the vif provided */ static int get_vif_cnt(struct sioc_vif_req *req) { vifi_t vifi = req->vifi; if (vifi >= numvifs) return EINVAL; req->icount = viftable[vifi].v_pkt_in; req->ocount = viftable[vifi].v_pkt_out; req->ibytes = viftable[vifi].v_bytes_in; req->obytes = viftable[vifi].v_bytes_out; return 0; } /* * Enable multicast routing */ static int ip_mrouter_init(struct socket *so, int v) { if (mrtdebug) log(LOG_DEBUG, "ip_mrouter_init: so_type = %d, pr_protocol = %d\n", so->so_type, so->so_proto->pr_protocol); if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_IGMP) return EOPNOTSUPP; if (v != 1) return EINVAL; if (ip_mrouter != NULL) return EADDRINUSE; ip_mrouter = so; mfchashtbl = hashinit(MFCTBLSIZ, HASH_LIST, true, &mfchash); memset((void *)nexpire, 0, sizeof(nexpire)); pim_assert = 0; callout_init(&expire_upcalls_ch, 0); callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls, NULL); callout_init(&bw_upcalls_ch, 0); callout_reset(&bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send, NULL); callout_init(&bw_meter_ch, 0); callout_reset(&bw_meter_ch, BW_METER_PERIOD, expire_bw_meter_process, NULL); if (mrtdebug) log(LOG_DEBUG, "ip_mrouter_init\n"); return 0; } /* * Disable multicast routing */ int ip_mrouter_done(void) { vifi_t vifi; struct vif *vifp; int i; int s; s = splsoftnet(); /* Clear out all the vifs currently in use. */ for (vifi = 0; vifi < numvifs; vifi++) { vifp = &viftable[vifi]; if (!in_nullhost(vifp->v_lcl_addr)) reset_vif(vifp); } numvifs = 0; pim_assert = 0; mrt_api_config = 0; callout_stop(&expire_upcalls_ch); callout_stop(&bw_upcalls_ch); callout_stop(&bw_meter_ch); /* * Free all multicast forwarding cache entries. */ for (i = 0; i < MFCTBLSIZ; i++) { struct mfc *rt, *nrt; for (rt = LIST_FIRST(&mfchashtbl[i]); rt; rt = nrt) { nrt = LIST_NEXT(rt, mfc_hash); expire_mfc(rt); } } memset((void *)nexpire, 0, sizeof(nexpire)); hashdone(mfchashtbl, HASH_LIST, mfchash); mfchashtbl = NULL; bw_upcalls_n = 0; memset(bw_meter_timers, 0, sizeof(bw_meter_timers)); /* Reset de-encapsulation cache. */ ip_mrouter = NULL; splx(s); if (mrtdebug) log(LOG_DEBUG, "ip_mrouter_done\n"); return 0; } void ip_mrouter_detach(struct ifnet *ifp) { int vifi, i; struct vif *vifp; struct mfc *rt; struct rtdetq *rte; /* XXX not sure about side effect to userland routing daemon */ for (vifi = 0; vifi < numvifs; vifi++) { vifp = &viftable[vifi]; if (vifp->v_ifp == ifp) reset_vif(vifp); } for (i = 0; i < MFCTBLSIZ; i++) { if (nexpire[i] == 0) continue; LIST_FOREACH(rt, &mfchashtbl[i], mfc_hash) { for (rte = rt->mfc_stall; rte; rte = rte->next) { if (rte->ifp == ifp) rte->ifp = NULL; } } } } /* * Set PIM assert processing global */ static int set_assert(int i) { pim_assert = !!i; return 0; } /* * Configure API capabilities */ static int set_api_config(struct sockopt *sopt) { u_int32_t apival; int i, error; /* * We can set the API capabilities only if it is the first operation * after MRT_INIT. I.e.: * - there are no vifs installed * - pim_assert is not enabled * - the MFC table is empty */ error = sockopt_get(sopt, &apival, sizeof(apival)); if (error) return error; if (numvifs > 0) return EPERM; if (pim_assert) return EPERM; for (i = 0; i < MFCTBLSIZ; i++) { if (LIST_FIRST(&mfchashtbl[i]) != NULL) return EPERM; } mrt_api_config = apival & mrt_api_support; return 0; } /* * Add a vif to the vif table */ static int add_vif(struct vifctl *vifcp) { struct vif *vifp; struct ifnet *ifp; int error, s; struct sockaddr_in sin; if (vifcp->vifc_vifi >= MAXVIFS) return EINVAL; if (in_nullhost(vifcp->vifc_lcl_addr)) return EADDRNOTAVAIL; vifp = &viftable[vifcp->vifc_vifi]; if (!in_nullhost(vifp->v_lcl_addr)) return EADDRINUSE; /* Find the interface with an address in AF_INET family. */ #ifdef PIM if (vifcp->vifc_flags & VIFF_REGISTER) { /* * XXX: Because VIFF_REGISTER does not really need a valid * local interface (e.g. it could be 127.0.0.2), we don't * check its address. */ ifp = NULL; } else #endif { struct ifaddr *ifa; sockaddr_in_init(&sin, &vifcp->vifc_lcl_addr, 0); s = pserialize_read_enter(); ifa = ifa_ifwithaddr(sintosa(&sin)); if (ifa == NULL) { pserialize_read_exit(s); return EADDRNOTAVAIL; } ifp = ifa->ifa_ifp; /* FIXME NOMPSAFE */ pserialize_read_exit(s); } if (vifcp->vifc_flags & VIFF_TUNNEL) { if (vifcp->vifc_flags & VIFF_SRCRT) { log(LOG_ERR, "source routed tunnels not supported\n"); return EOPNOTSUPP; } /* attach this vif to decapsulator dispatch table */ /* * XXX Use addresses in registration so that matching * can be done with radix tree in decapsulator. But, * we need to check inner header for multicast, so * this requires both radix tree lookup and then a * function to check, and this is not supported yet. */ error = encap_lock_enter(); if (error) return error; vifp->v_encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV4, vif_encapcheck, &vif_encapsw, vifp); encap_lock_exit(); if (!vifp->v_encap_cookie) return EINVAL; /* Create a fake encapsulation interface. */ ifp = malloc(sizeof(*ifp), M_MRTABLE, M_WAITOK|M_ZERO); snprintf(ifp->if_xname, sizeof(ifp->if_xname), "mdecap%d", vifcp->vifc_vifi); /* Prepare cached route entry. */ memset(&vifp->v_route, 0, sizeof(vifp->v_route)); #ifdef PIM } else if (vifcp->vifc_flags & VIFF_REGISTER) { ifp = &multicast_register_if; if (mrtdebug) log(LOG_DEBUG, "Adding a register vif, ifp: %p\n", (void *)ifp); if (reg_vif_num == VIFI_INVALID) { memset(ifp, 0, sizeof(*ifp)); snprintf(ifp->if_xname, sizeof(ifp->if_xname), "register_vif"); ifp->if_flags = IFF_LOOPBACK; memset(&vifp->v_route, 0, sizeof(vifp->v_route)); reg_vif_num = vifcp->vifc_vifi; } #endif } else { /* Make sure the interface supports multicast. */ if ((ifp->if_flags & IFF_MULTICAST) == 0) return EOPNOTSUPP; /* Enable promiscuous reception of all IP multicasts. */ sockaddr_in_init(&sin, &zeroin_addr, 0); error = if_mcast_op(ifp, SIOCADDMULTI, sintosa(&sin)); if (error) return error; } s = splsoftnet(); /* Define parameters for the tbf structure. */ vifp->tbf_q = NULL; vifp->tbf_t = &vifp->tbf_q; microtime(&vifp->tbf_last_pkt_t); vifp->tbf_n_tok = 0; vifp->tbf_q_len = 0; vifp->tbf_max_q_len = MAXQSIZE; vifp->v_flags = vifcp->vifc_flags; vifp->v_threshold = vifcp->vifc_threshold; /* scaling up here allows division by 1024 in critical code */ vifp->v_rate_limit = vifcp->vifc_rate_limit * 1024 / 1000; vifp->v_lcl_addr = vifcp->vifc_lcl_addr; vifp->v_rmt_addr = vifcp->vifc_rmt_addr; vifp->v_ifp = ifp; /* 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; callout_init(&vifp->v_repq_ch, 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 %x, %s %x, thresh %x, rate %d\n", vifcp->vifc_vifi, ntohl(vifcp->vifc_lcl_addr.s_addr), (vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask", ntohl(vifcp->vifc_rmt_addr.s_addr), vifcp->vifc_threshold, vifcp->vifc_rate_limit); return 0; } void reset_vif(struct vif *vifp) { struct mbuf *m, *n; struct ifnet *ifp; struct sockaddr_in sin; callout_stop(&vifp->v_repq_ch); /* detach this vif from decapsulator dispatch table */ encap_lock_enter(); encap_detach(vifp->v_encap_cookie); encap_lock_exit(); vifp->v_encap_cookie = NULL; /* * Free packets queued at the interface */ for (m = vifp->tbf_q; m != NULL; m = n) { n = m->m_nextpkt; m_freem(m); } if (vifp->v_flags & VIFF_TUNNEL) free(vifp->v_ifp, M_MRTABLE); else if (vifp->v_flags & VIFF_REGISTER) { #ifdef PIM reg_vif_num = VIFI_INVALID; #endif } else { sockaddr_in_init(&sin, &zeroin_addr, 0); ifp = vifp->v_ifp; if_mcast_op(ifp, SIOCDELMULTI, sintosa(&sin)); } memset((void *)vifp, 0, sizeof(*vifp)); } /* * Delete a vif from the vif table */ static int del_vif(vifi_t *vifip) { struct vif *vifp; vifi_t vifi; int s; if (*vifip >= numvifs) return EINVAL; vifp = &viftable[*vifip]; if (in_nullhost(vifp->v_lcl_addr)) return EADDRNOTAVAIL; s = splsoftnet(); reset_vif(vifp); /* Adjust numvifs down */ for (vifi = numvifs; vifi > 0; vifi--) if (!in_nullhost(viftable[vifi - 1].v_lcl_addr)) break; numvifs = vifi; splx(s); if (mrtdebug) log(LOG_DEBUG, "del_vif %d, numvifs %d\n", *vifip, numvifs); return 0; } /* * update an mfc entry without resetting counters and S,G addresses. */ static void update_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp) { int i; rt->mfc_parent = mfccp->mfcc_parent; for (i = 0; i < numvifs; i++) { rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; rt->mfc_flags[i] = mfccp->mfcc_flags[i] & mrt_api_config & MRT_MFC_FLAGS_ALL; } /* set the RP address */ if (mrt_api_config & MRT_MFC_RP) rt->mfc_rp = mfccp->mfcc_rp; else rt->mfc_rp = zeroin_addr; } /* * fully initialize an mfc entry from the parameter. */ static void init_mfc_params(struct mfc *rt, struct mfcctl2 *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; timerclear(&rt->mfc_last_assert); } static void expire_mfc(struct mfc *rt) { struct rtdetq *rte, *nrte; free_bw_list(rt->mfc_bw_meter); for (rte = rt->mfc_stall; rte != NULL; rte = nrte) { nrte = rte->next; m_freem(rte->m); free(rte, M_MRTABLE); } LIST_REMOVE(rt, mfc_hash); free(rt, M_MRTABLE); } /* * Add an mfc entry */ static int add_mfc(struct sockopt *sopt) { struct mfcctl2 mfcctl2; struct mfcctl2 *mfccp; struct mfc *rt; u_int32_t hash = 0; struct rtdetq *rte, *nrte; u_short nstl; int s; int error; /* * select data size depending on API version. */ mfccp = &mfcctl2; memset(&mfcctl2, 0, sizeof(mfcctl2)); if (mrt_api_config & MRT_API_FLAGS_ALL) error = sockopt_get(sopt, mfccp, sizeof(struct mfcctl2)); else error = sockopt_get(sopt, mfccp, sizeof(struct mfcctl)); if (error) return error; s = splsoftnet(); rt = mfc_find(&mfccp->mfcc_origin, &mfccp->mfcc_mcastgrp); /* If an entry already exists, just update the fields */ if (rt) { if (mrtdebug & DEBUG_MFC) log(LOG_DEBUG, "add_mfc update o %x g %x p %x\n", ntohl(mfccp->mfcc_origin.s_addr), ntohl(mfccp->mfcc_mcastgrp.s_addr), mfccp->mfcc_parent); update_mfc_params(rt, mfccp); splx(s); return 0; } /* * Find the entry for which the upcall was made and update */ nstl = 0; hash = MFCHASH(mfccp->mfcc_origin, mfccp->mfcc_mcastgrp); LIST_FOREACH(rt, &mfchashtbl[hash], mfc_hash) { if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) && in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp) && rt->mfc_stall != NULL) { if (nstl++) log(LOG_ERR, "add_mfc %s o %x g %x p %x dbx %p\n", "multiple kernel entries", ntohl(mfccp->mfcc_origin.s_addr), ntohl(mfccp->mfcc_mcastgrp.s_addr), mfccp->mfcc_parent, rt->mfc_stall); if (mrtdebug & DEBUG_MFC) log(LOG_DEBUG, "add_mfc o %x g %x p %x dbg %p\n", ntohl(mfccp->mfcc_origin.s_addr), ntohl(mfccp->mfcc_mcastgrp.s_addr), mfccp->mfcc_parent, rt->mfc_stall); rte = rt->mfc_stall; init_mfc_params(rt, mfccp); rt->mfc_stall = NULL; rt->mfc_expire = 0; /* Don't clean this guy up */ nexpire[hash]--; /* free packets Qed at the end of this entry */ for (; rte != NULL; rte = nrte) { nrte = rte->next; if (rte->ifp) { ip_mdq(rte->m, rte->ifp, rt); } m_freem(rte->m); #ifdef UPCALL_TIMING collate(&rte->t); #endif /* UPCALL_TIMING */ free(rte, M_MRTABLE); } } } /* * It is possible that an entry is being inserted without an upcall */ if (nstl == 0) { /* * No mfc; make a new one */ if (mrtdebug & DEBUG_MFC) log(LOG_DEBUG, "add_mfc no upcall o %x g %x p %x\n", ntohl(mfccp->mfcc_origin.s_addr), ntohl(mfccp->mfcc_mcastgrp.s_addr), mfccp->mfcc_parent); LIST_FOREACH(rt, &mfchashtbl[hash], mfc_hash) { if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) && in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp)) { 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 = 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; rt->mfc_bw_meter = NULL; /* insert new entry at head of hash chain */ LIST_INSERT_HEAD(&mfchashtbl[hash], rt, mfc_hash); } } splx(s); return 0; } #ifdef UPCALL_TIMING /* * collect delay statistics on the upcalls */ static void collate(struct timeval *t) { u_int32_t d; struct timeval tp; u_int32_t delta; microtime(&tp); if (timercmp(t, &tp, <)) { TV_DELTA(tp, *t, delta); d = delta >> 10; if (d > 50) d = 50; ++upcall_data[d]; } } #endif /* UPCALL_TIMING */ /* * Delete an mfc entry */ static int del_mfc(struct sockopt *sopt) { struct mfcctl2 mfcctl2; struct mfcctl2 *mfccp; struct mfc *rt; int s; int error; /* * XXX: for deleting MFC entries the information in entries * of size "struct mfcctl" is sufficient. */ mfccp = &mfcctl2; memset(&mfcctl2, 0, sizeof(mfcctl2)); error = sockopt_get(sopt, mfccp, sizeof(struct mfcctl)); if (error) { /* Try with the size of mfcctl2. */ error = sockopt_get(sopt, mfccp, sizeof(struct mfcctl2)); if (error) return error; } if (mrtdebug & DEBUG_MFC) log(LOG_DEBUG, "del_mfc origin %x mcastgrp %x\n", ntohl(mfccp->mfcc_origin.s_addr), ntohl(mfccp->mfcc_mcastgrp.s_addr)); s = splsoftnet(); rt = mfc_find(&mfccp->mfcc_origin, &mfccp->mfcc_mcastgrp); if (rt == NULL) { splx(s); return EADDRNOTAVAIL; } /* * free the bw_meter entries */ free_bw_list(rt->mfc_bw_meter); rt->mfc_bw_meter = NULL; LIST_REMOVE(rt, mfc_hash); free(rt, M_MRTABLE); splx(s); return 0; } static int socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in *src) { if (s) { if (sbappendaddr(&s->so_rcv, sintosa(src), mm, NULL) != 0) { sorwakeup(s); return 0; } soroverflow(s); } 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 IP_HDR_LEN 20 /* # bytes of fixed IP header (excluding options) */ #define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */ int ip_mforward(struct mbuf *m, struct ifnet *ifp) { int rc; /* * save csum_flags to uphold the * "unscathed" guarantee. * ip_output() relies on that and * without it we send out * multicast packets with an invalid * checksum * * see PR kern/55779 */ int csum_flags = m->m_pkthdr.csum_flags; /* * Temporarily clear any in-bound checksum flags for this packet. */ m->m_pkthdr.csum_flags = 0; rc = ip_mforward_real(m, ifp); m->m_pkthdr.csum_flags = csum_flags; return rc; } static int ip_mforward_real(struct mbuf *m, struct ifnet *ifp) { struct ip *ip = mtod(m, struct ip *); struct mfc *rt; static int srctun = 0; struct mbuf *mm; struct sockaddr_in sin; int s; vifi_t vifi; if (mrtdebug & DEBUG_FORWARD) log(LOG_DEBUG, "ip_mforward: src %x, dst %x, ifp %p\n", ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), ifp); /* * XXX XXX: Why do we check [1] against IPOPT_LSRR? Because we * expect [0] to be IPOPT_NOP, maybe? In all cases that doesn't * make a lot of sense, a forged packet can just put two IPOPT_NOPs * followed by one IPOPT_LSRR, and bypass the check. */ if (ip->ip_hl < (IP_HDR_LEN + TUNNEL_LEN) >> 2 || ((u_char *)(ip + 1))[1] != IPOPT_LSRR) { /* * Packet arrived via a physical interface or * an encapsulated tunnel or a register_vif. */ } else { /* * Packet arrived through a source-route tunnel. * Source-route tunnels are no longer supported. */ if ((srctun++ % 1000) == 0) log(LOG_ERR, "ip_mforward: received source-routed packet from %x\n", ntohl(ip->ip_src.s_addr)); return EOPNOTSUPP; } /* * 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 || IN_LOCAL_GROUP(ip->ip_dst.s_addr)) return 0; /* * Determine forwarding vifs from the forwarding cache table */ s = splsoftnet(); ++mrtstat.mrts_mfc_lookups; rt = mfc_find(&ip->ip_src, &ip->ip_dst); /* Entry exists, so forward if necessary */ if (rt != NULL) { splx(s); return ip_mdq(m, ifp, rt); } else { /* * If we don't have a route for packet's origin, make a copy * of the packet and send message to routing daemon. */ struct mbuf *mb0; struct rtdetq *rte; u_int32_t hash; const int hlen = ip->ip_hl << 2; #ifdef UPCALL_TIMING struct timeval tp; microtime(&tp); #endif ++mrtstat.mrts_mfc_misses; mrtstat.mrts_no_route++; if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC)) log(LOG_DEBUG, "ip_mforward: no rte s %x g %x\n", ntohl(ip->ip_src.s_addr), 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 = malloc(sizeof(*rte), M_MRTABLE, M_NOWAIT); if (rte == NULL) { splx(s); return ENOBUFS; } mb0 = m_copypacket(m, M_DONTWAIT); 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, ip->ip_dst); LIST_FOREACH(rt, &mfchashtbl[hash], mfc_hash) { if (in_hosteq(ip->ip_src, rt->mfc_origin) && in_hosteq(ip->ip_dst, rt->mfc_mcastgrp) && rt->mfc_stall != NULL) break; } if (rt == NULL) { int i; struct igmpmsg *im; /* * 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 = 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_copym(m, 0, hlen, M_DONTWAIT); M_PULLUP(mm, 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++; sockaddr_in_init(&sin, &ip->ip_src, 0); if (socket_send(ip_mrouter, mm, &sin) < 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 = ip->ip_src; rt->mfc_mcastgrp = ip->ip_dst; rt->mfc_pkt_cnt = 0; rt->mfc_byte_cnt = 0; rt->mfc_wrong_if = 0; rt->mfc_expire = UPCALL_EXPIRE; nexpire[hash]++; for (i = 0; i < numvifs; i++) { rt->mfc_ttls[i] = 0; rt->mfc_flags[i] = 0; } rt->mfc_parent = -1; /* clear the RP address */ rt->mfc_rp = zeroin_addr; rt->mfc_bw_meter = NULL; /* link into table */ LIST_INSERT_HEAD(&mfchashtbl[hash], rt, mfc_hash); /* Add this entry to the end of the queue */ rt->mfc_stall = rte; } else { /* determine if q has overflowed */ struct rtdetq **p; int npkts = 0; /* * 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) 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->next = NULL; rte->m = mb0; rte->ifp = ifp; #ifdef UPCALL_TIMING rte->t = tp; #endif splx(s); return 0; } } /*ARGSUSED*/ static void expire_upcalls(void *v) { int i; /* XXX NOMPSAFE still need softnet_lock */ mutex_enter(softnet_lock); KERNEL_LOCK(1, NULL); for (i = 0; i < MFCTBLSIZ; i++) { struct mfc *rt, *nrt; if (nexpire[i] == 0) continue; for (rt = LIST_FIRST(&mfchashtbl[i]); rt; rt = nrt) { nrt = LIST_NEXT(rt, mfc_hash); if (rt->mfc_expire == 0 || --rt->mfc_expire > 0) continue; nexpire[i]--; /* * free the bw_meter entries */ while (rt->mfc_bw_meter != NULL) { struct bw_meter *x = rt->mfc_bw_meter; rt->mfc_bw_meter = x->bm_mfc_next; kmem_intr_free(x, sizeof(*x)); } ++mrtstat.mrts_cache_cleanups; if (mrtdebug & DEBUG_EXPIRE) log(LOG_DEBUG, "expire_upcalls: expiring (%x %x)\n", ntohl(rt->mfc_origin.s_addr), ntohl(rt->mfc_mcastgrp.s_addr)); expire_mfc(rt); } } callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls, NULL); KERNEL_UNLOCK_ONE(NULL); mutex_exit(softnet_lock); } /* * Macro to send packet on vif. */ #define MC_SEND(ip, vifp, m) do { \ if ((vifp)->v_flags & VIFF_TUNNEL) \ encap_send((ip), (vifp), (m)); \ else \ phyint_send((ip), (vifp), (m)); \ } while (/*CONSTCOND*/ 0) /* * Packet forwarding routine once entry in the cache is made */ static int ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt) { struct ip *ip = mtod(m, struct ip *); vifi_t vifi; struct vif *vifp; struct sockaddr_in sin; const int plen = ntohs(ip->ip_len) - (ip->ip_hl << 2); /* * 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", ifp, vifi, vifi >= numvifs ? 0 : viftable[vifi].v_ifp); ++mrtstat.mrts_wrong_if; ++rt->mfc_wrong_if; /* * If we are doing PIM assert processing, send a message * to the routing daemon. * * XXX: A PIM-SM router needs the WRONGVIF detection so it * can complete the SPT switch, regardless of the type * of the iif (broadcast media, GRE tunnel, etc). */ if (pim_assert && (vifi < numvifs) && viftable[vifi].v_ifp) { struct timeval now; u_int32_t delta; #ifdef PIM if (ifp == &multicast_register_if) pimstat.pims_rcv_registers_wrongiif++; #endif /* Get vifi for the incoming packet */ for (vifi = 0; vifi < numvifs && viftable[vifi].v_ifp != ifp; vifi++) ; if (vifi >= numvifs) { /* The iif is not found: ignore the packet. */ return 0; } if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_DISABLE_WRONGVIF) { /* WRONGVIF disabled: ignore the packet */ return 0; } microtime(&now); TV_DELTA(rt->mfc_last_assert, now, delta); if (delta > ASSERT_MSG_TIME) { struct igmpmsg *im; const int hlen = ip->ip_hl << 2; struct mbuf *mm = m_copym(m, 0, hlen, M_DONTWAIT); 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; mrtstat.mrts_upcalls++; sockaddr_in_init(&sin, &im->im_src, 0); if (socket_send(ip_mrouter, mm, &sin) < 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 (in_hosteq(ip->ip_src, viftable[vifi].v_lcl_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 (vifp = viftable, vifi = 0; vifi < numvifs; vifp++, vifi++) { if ((rt->mfc_ttls[vifi] > 0) && (ip->ip_ttl > rt->mfc_ttls[vifi])) { vifp->v_pkt_out++; vifp->v_bytes_out += plen; #ifdef PIM if (vifp->v_flags & VIFF_REGISTER) pim_register_send(ip, vifp, m, rt); else #endif MC_SEND(ip, vifp, m); } } /* * Perform upcall-related bw measuring. */ if (rt->mfc_bw_meter != NULL) { struct bw_meter *x; struct timeval now; microtime(&now); for (x = rt->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) bw_meter_receive_packet(x, plen, &now); } return 0; } static void phyint_send(struct ip *ip, struct vif *vifp, struct mbuf *m) { struct mbuf *mb_copy; const 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_copypacket(m, M_DONTWAIT); 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 *), ntohs(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 = ntohs(ip->ip_len) + sizeof(multicast_encap_iphdr); /* Take care of delayed checksums */ if (m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { in_undefer_cksum_tcpudp(m); m->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); } /* * 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_DATA); if (mb_copy == NULL) return; mb_copy->m_data += max_linkhdr; mb_copy->m_pkthdr.len = len; mb_copy->m_len = sizeof(multicast_encap_iphdr); if ((mb_copy->m_next = m_copypacket(m, M_DONTWAIT)) == NULL) { m_freem(mb_copy); return; } i = MHLEN - max_linkhdr; if (i > len) i = len; mb_copy = m_pullup(mb_copy, i); if (mb_copy == NULL) return; /* * fill in the encapsulating IP header. */ ip_copy = mtod(mb_copy, struct ip *); *ip_copy = multicast_encap_iphdr; if (len < IP_MINFRAGSIZE) ip_copy->ip_id = 0; else ip_copy->ip_id = ip_newid(NULL); ip_copy->ip_len = htons(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 *)((char *)ip_copy + sizeof(multicast_encap_iphdr)); --ip->ip_ttl; 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, ntohs(ip_copy->ip_len)); } /* * De-encapsulate a packet and feed it back through ip input. */ static void vif_input(struct mbuf *m, int off, int proto, void *eparg) { struct vif *vifp = eparg; KASSERT(vifp != NULL); if (proto != ENCAP_PROTO) { m_freem(m); mrtstat.mrts_bad_tunnel++; return; } m_adj(m, off); m_set_rcvif(m, vifp->v_ifp); if (__predict_false(!pktq_enqueue(ip_pktq, m, 0))) { m_freem(m); } } /* * Check if the packet should be received on the vif denoted by arg. * (The encap selection code will call this once per vif since each is * registered separately.) */ static int vif_encapcheck(struct mbuf *m, int off, int proto, void *arg) { struct vif *vifp; struct ip ip; #ifdef DIAGNOSTIC if (!arg || proto != IPPROTO_IPV4) panic("unexpected arg in vif_encapcheck"); #endif /* * Accept the packet only if the inner header is multicast * and the outer header matches a tunnel-mode vif. Order * checks in the hope that common non-matching packets will be * rejected quickly. Assume that unicast IPv4 traffic in a * parallel tunnel (e.g. gif(4)) is unlikely. */ /* Obtain the outer IP header and the vif pointer. */ m_copydata(m, 0, sizeof(ip), (void *)&ip); vifp = (struct vif *)arg; /* * The outer source must match the vif's remote peer address. * For a multicast router with several tunnels, this is the * only check that will fail on packets in other tunnels, * assuming the local address is the same. */ if (!in_hosteq(vifp->v_rmt_addr, ip.ip_src)) return 0; /* The outer destination must match the vif's local address. */ if (!in_hosteq(vifp->v_lcl_addr, ip.ip_dst)) return 0; /* The vif must be of tunnel type. */ if ((vifp->v_flags & VIFF_TUNNEL) == 0) return 0; /* Check that the inner destination is multicast. */ if (off + sizeof(ip) > m->m_pkthdr.len) return 0; m_copydata(m, off, sizeof(ip), (void *)&ip); if (!IN_MULTICAST(ip.ip_dst.s_addr)) return 0; /* * We have checked that both the outer src and dst addresses * match the vif, and that the inner destination is multicast * (224/5). By claiming more than 64, we intend to * preferentially take packets that also match a parallel * gif(4). */ return 32 + 32 + 5; } /* * Token bucket filter module */ static void tbf_control(struct vif *vifp, struct mbuf *m, struct ip *ip, u_int32_t len) { if (len > MAX_BKT_SIZE) { /* drop if packet is too large */ mrtstat.mrts_pkt2large++; m_freem(m); return; } tbf_update_tokens(vifp); /* * If there are enough tokens, and the queue is empty, send this packet * out immediately. Otherwise, try to insert it on this vif's queue. */ if (vifp->tbf_q_len == 0) { if (len <= vifp->tbf_n_tok) { vifp->tbf_n_tok -= len; tbf_send_packet(vifp, m); } else { /* queue packet and timeout till later */ tbf_queue(vifp, m); callout_reset(&vifp->v_repq_ch, TBF_REPROCESS, tbf_reprocess_q, vifp); } } else { if (vifp->tbf_q_len >= vifp->tbf_max_q_len && !tbf_dq_sel(vifp, ip)) { /* queue full, and couldn't make room */ mrtstat.mrts_q_overflow++; m_freem(m); } else { /* queue length low enough, or made room */ 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 = splsoftnet(); /* insert at tail */ *vifp->tbf_t = m; vifp->tbf_t = &m->m_nextpkt; vifp->tbf_q_len++; splx(s); } /* * processes the queue at the interface */ static void tbf_process_q(struct vif *vifp) { struct mbuf *m; int len; int s = splsoftnet(); /* * Loop through the queue at the interface and send as many packets * as possible. */ for (m = vifp->tbf_q; m != NULL; m = vifp->tbf_q) { len = ntohs(mtod(m, struct ip *)->ip_len); /* determine if the packet can be sent */ if (len <= vifp->tbf_n_tok) { /* if so, * reduce no of tokens, dequeue the packet, * send the packet. */ if ((vifp->tbf_q = m->m_nextpkt) == NULL) vifp->tbf_t = &vifp->tbf_q; --vifp->tbf_q_len; m->m_nextpkt = NULL; vifp->tbf_n_tok -= len; tbf_send_packet(vifp, m); } else break; } splx(s); } static void tbf_reprocess_q(void *arg) { struct vif *vifp = arg; if (ip_mrouter == NULL) return; tbf_update_tokens(vifp); tbf_process_q(vifp); if (vifp->tbf_q_len != 0) callout_reset(&vifp->v_repq_ch, TBF_REPROCESS, tbf_reprocess_q, vifp); } /* 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) { u_int p; struct mbuf **mp, *m; int s = splsoftnet(); p = priority(vifp, ip); for (mp = &vifp->tbf_q, m = *mp; m != NULL; mp = &m->m_nextpkt, m = *mp) { if (p > priority(vifp, mtod(m, struct ip *))) { if ((*mp = m->m_nextpkt) == NULL) vifp->tbf_t = mp; --vifp->tbf_q_len; m_freem(m); mrtstat.mrts_drop_sel++; splx(s); return 1; } } splx(s); return 0; } static void tbf_send_packet(struct vif *vifp, struct mbuf *m) { int error; int s = splsoftnet(); if (vifp->v_flags & VIFF_TUNNEL) { /* If tunnel options */ ip_output(m, NULL, &vifp->v_route, IP_FORWARDING, NULL, NULL); } else { /* if physical interface option, extract the options and then send */ struct ip_moptions imo; imo.imo_multicast_if_index = if_get_index(vifp->v_ifp); imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1; imo.imo_multicast_loop = 1; error = ip_output(m, NULL, NULL, IP_FORWARDING|IP_MULTICASTOPTS, &imo, NULL); if (mrtdebug & DEBUG_XMIT) log(LOG_DEBUG, "phyint_send on vif %ld err %d\n", (long)(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_int32_t tm; int s = splsoftnet(); microtime(&tp); TV_DELTA(tp, vifp->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. */ vifp->tbf_n_tok += tm * vifp->v_rate_limit / 8192; vifp->tbf_last_pkt_t = tp; if (vifp->tbf_n_tok > MAX_BKT_SIZE) vifp->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 */ /* * XXX XXX: We're reading the UDP header, but we didn't ensure * it was present in the packet. */ /* * 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 */ 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; } if (tbfdebug > 1) log(LOG_DEBUG, "port %x prio %d\n", ntohs(udp->uh_dport), prio); } return prio; } /* * Code for bandwidth monitors */ /* * Define common interface for timeval-related methods */ #define BW_TIMEVALCMP(tvp, uvp, cmp) timercmp((tvp), (uvp), cmp) #define BW_TIMEVALDECR(vvp, uvp) timersub((vvp), (uvp), (vvp)) #define BW_TIMEVALADD(vvp, uvp) timeradd((vvp), (uvp), (vvp)) static uint32_t compute_bw_meter_flags(struct bw_upcall *req) { uint32_t flags = 0; if (req->bu_flags & BW_UPCALL_UNIT_PACKETS) flags |= BW_METER_UNIT_PACKETS; if (req->bu_flags & BW_UPCALL_UNIT_BYTES) flags |= BW_METER_UNIT_BYTES; if (req->bu_flags & BW_UPCALL_GEQ) flags |= BW_METER_GEQ; if (req->bu_flags & BW_UPCALL_LEQ) flags |= BW_METER_LEQ; return flags; } /* * Add a bw_meter entry */ static int add_bw_upcall(struct bw_upcall *req) { int s; struct mfc *mfc; struct timeval delta = { BW_UPCALL_THRESHOLD_INTERVAL_MIN_SEC, BW_UPCALL_THRESHOLD_INTERVAL_MIN_USEC }; struct timeval now; struct bw_meter *x; uint32_t flags; if (!(mrt_api_config & MRT_MFC_BW_UPCALL)) return EOPNOTSUPP; /* Test if the flags are valid */ if (!(req->bu_flags & (BW_UPCALL_UNIT_PACKETS | BW_UPCALL_UNIT_BYTES))) return EINVAL; if (!(req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ))) return EINVAL; if ((req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) == (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) return EINVAL; /* Test if the threshold time interval is valid */ if (BW_TIMEVALCMP(&req->bu_threshold.b_time, &delta, <)) return EINVAL; flags = compute_bw_meter_flags(req); /* * Find if we have already same bw_meter entry */ s = splsoftnet(); mfc = mfc_find(&req->bu_src, &req->bu_dst); if (mfc == NULL) { splx(s); return EADDRNOTAVAIL; } for (x = mfc->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) { if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, &req->bu_threshold.b_time, ==)) && (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && (x->bm_flags & BW_METER_USER_FLAGS) == flags) { splx(s); return 0; /* XXX Already installed */ } } /* Allocate the new bw_meter entry */ x = kmem_intr_alloc(sizeof(*x), KM_NOSLEEP); if (x == NULL) { splx(s); return ENOBUFS; } /* Set the new bw_meter entry */ x->bm_threshold.b_time = req->bu_threshold.b_time; microtime(&now); x->bm_start_time = now; x->bm_threshold.b_packets = req->bu_threshold.b_packets; x->bm_threshold.b_bytes = req->bu_threshold.b_bytes; x->bm_measured.b_packets = 0; x->bm_measured.b_bytes = 0; x->bm_flags = flags; x->bm_time_next = NULL; x->bm_time_hash = BW_METER_BUCKETS; /* Add the new bw_meter entry to the front of entries for this MFC */ x->bm_mfc = mfc; x->bm_mfc_next = mfc->mfc_bw_meter; mfc->mfc_bw_meter = x; schedule_bw_meter(x, &now); splx(s); return 0; } static void free_bw_list(struct bw_meter *list) { while (list != NULL) { struct bw_meter *x = list; list = list->bm_mfc_next; unschedule_bw_meter(x); kmem_intr_free(x, sizeof(*x)); } } /* * Delete one or multiple bw_meter entries */ static int del_bw_upcall(struct bw_upcall *req) { int s; struct mfc *mfc; struct bw_meter *x; if (!(mrt_api_config & MRT_MFC_BW_UPCALL)) return EOPNOTSUPP; s = splsoftnet(); /* Find the corresponding MFC entry */ mfc = mfc_find(&req->bu_src, &req->bu_dst); if (mfc == NULL) { splx(s); return EADDRNOTAVAIL; } else if (req->bu_flags & BW_UPCALL_DELETE_ALL) { /* * Delete all bw_meter entries for this mfc */ struct bw_meter *list; list = mfc->mfc_bw_meter; mfc->mfc_bw_meter = NULL; free_bw_list(list); splx(s); return 0; } else { /* Delete a single bw_meter entry */ struct bw_meter *prev; uint32_t flags = 0; flags = compute_bw_meter_flags(req); /* Find the bw_meter entry to delete */ for (prev = NULL, x = mfc->mfc_bw_meter; x != NULL; prev = x, x = x->bm_mfc_next) { if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, &req->bu_threshold.b_time, ==)) && (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && (x->bm_flags & BW_METER_USER_FLAGS) == flags) break; } if (x != NULL) { /* Delete entry from the list for this MFC */ if (prev != NULL) prev->bm_mfc_next = x->bm_mfc_next; /* remove from middle*/ else x->bm_mfc->mfc_bw_meter = x->bm_mfc_next;/* new head of list */ unschedule_bw_meter(x); splx(s); /* Free the bw_meter entry */ kmem_intr_free(x, sizeof(*x)); return 0; } else { splx(s); return EINVAL; } } /* NOTREACHED */ } /* * Perform bandwidth measurement processing that may result in an upcall */ static void bw_meter_receive_packet(struct bw_meter *x, int plen, struct timeval *nowp) { struct timeval delta; delta = *nowp; BW_TIMEVALDECR(&delta, &x->bm_start_time); if (x->bm_flags & BW_METER_GEQ) { /* * Processing for ">=" type of bw_meter entry */ if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { /* Reset the bw_meter entry */ x->bm_start_time = *nowp; x->bm_measured.b_packets = 0; x->bm_measured.b_bytes = 0; x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; } /* Record that a packet is received */ x->bm_measured.b_packets++; x->bm_measured.b_bytes += plen; /* * Test if we should deliver an upcall */ if (!(x->bm_flags & BW_METER_UPCALL_DELIVERED)) { if (((x->bm_flags & BW_METER_UNIT_PACKETS) && (x->bm_measured.b_packets >= x->bm_threshold.b_packets)) || ((x->bm_flags & BW_METER_UNIT_BYTES) && (x->bm_measured.b_bytes >= x->bm_threshold.b_bytes))) { /* Prepare an upcall for delivery */ bw_meter_prepare_upcall(x, nowp); x->bm_flags |= BW_METER_UPCALL_DELIVERED; } } } else if (x->bm_flags & BW_METER_LEQ) { /* * Processing for "<=" type of bw_meter entry */ if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { /* * We are behind time with the multicast forwarding table * scanning for "<=" type of bw_meter entries, so test now * if we should deliver an upcall. */ if (((x->bm_flags & BW_METER_UNIT_PACKETS) && (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || ((x->bm_flags & BW_METER_UNIT_BYTES) && (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { /* Prepare an upcall for delivery */ bw_meter_prepare_upcall(x, nowp); } /* Reschedule the bw_meter entry */ unschedule_bw_meter(x); schedule_bw_meter(x, nowp); } /* Record that a packet is received */ x->bm_measured.b_packets++; x->bm_measured.b_bytes += plen; /* * Test if we should restart the measuring interval */ if ((x->bm_flags & BW_METER_UNIT_PACKETS && x->bm_measured.b_packets <= x->bm_threshold.b_packets) || (x->bm_flags & BW_METER_UNIT_BYTES && x->bm_measured.b_bytes <= x->bm_threshold.b_bytes)) { /* Don't restart the measuring interval */ } else { /* Do restart the measuring interval */ /* * XXX: note that we don't unschedule and schedule, because this * might be too much overhead per packet. Instead, when we process * all entries for a given timer hash bin, we check whether it is * really a timeout. If not, we reschedule at that time. */ x->bm_start_time = *nowp; x->bm_measured.b_packets = 0; x->bm_measured.b_bytes = 0; x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; } } } /* * Prepare a bandwidth-related upcall */ static void bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp) { struct timeval delta; struct bw_upcall *u; /* * Compute the measured time interval */ delta = *nowp; BW_TIMEVALDECR(&delta, &x->bm_start_time); /* * If there are too many pending upcalls, deliver them now */ if (bw_upcalls_n >= BW_UPCALLS_MAX) bw_upcalls_send(); /* * Set the bw_upcall entry */ u = &bw_upcalls[bw_upcalls_n++]; u->bu_src = x->bm_mfc->mfc_origin; u->bu_dst = x->bm_mfc->mfc_mcastgrp; u->bu_threshold.b_time = x->bm_threshold.b_time; u->bu_threshold.b_packets = x->bm_threshold.b_packets; u->bu_threshold.b_bytes = x->bm_threshold.b_bytes; u->bu_measured.b_time = delta; u->bu_measured.b_packets = x->bm_measured.b_packets; u->bu_measured.b_bytes = x->bm_measured.b_bytes; u->bu_flags = 0; if (x->bm_flags & BW_METER_UNIT_PACKETS) u->bu_flags |= BW_UPCALL_UNIT_PACKETS; if (x->bm_flags & BW_METER_UNIT_BYTES) u->bu_flags |= BW_UPCALL_UNIT_BYTES; if (x->bm_flags & BW_METER_GEQ) u->bu_flags |= BW_UPCALL_GEQ; if (x->bm_flags & BW_METER_LEQ) u->bu_flags |= BW_UPCALL_LEQ; } /* * Send the pending bandwidth-related upcalls */ static void bw_upcalls_send(void) { struct mbuf *m; int len = bw_upcalls_n * sizeof(bw_upcalls[0]); struct sockaddr_in k_igmpsrc = { .sin_len = sizeof(k_igmpsrc), .sin_family = AF_INET, }; static struct igmpmsg igmpmsg = { 0, /* unused1 */ 0, /* unused2 */ IGMPMSG_BW_UPCALL,/* im_msgtype */ 0, /* im_mbz */ 0, /* im_vif */ 0, /* unused3 */ { 0 }, /* im_src */ { 0 } /* im_dst */ }; if (bw_upcalls_n == 0) return; /* No pending upcalls */ bw_upcalls_n = 0; /* * Allocate a new mbuf, initialize it with the header and * the payload for the pending calls. */ MGETHDR(m, M_DONTWAIT, MT_HEADER); if (m == NULL) { log(LOG_WARNING, "bw_upcalls_send: cannot allocate mbuf\n"); return; } m->m_len = m->m_pkthdr.len = 0; m_copyback(m, 0, sizeof(struct igmpmsg), (void *)&igmpmsg); m_copyback(m, sizeof(struct igmpmsg), len, (void *)&bw_upcalls[0]); /* * Send the upcalls * XXX do we need to set the address in k_igmpsrc ? */ mrtstat.mrts_upcalls++; if (socket_send(ip_mrouter, m, &k_igmpsrc) < 0) { log(LOG_WARNING, "bw_upcalls_send: ip_mrouter socket queue full\n"); ++mrtstat.mrts_upq_sockfull; } } /* * Compute the timeout hash value for the bw_meter entries */ #define BW_METER_TIMEHASH(bw_meter, hash) \ do { \ struct timeval next_timeval = (bw_meter)->bm_start_time; \ BW_TIMEVALADD(&next_timeval, &(bw_meter)->bm_threshold.b_time); \ (hash) = next_timeval.tv_sec; \ if (next_timeval.tv_usec) \ (hash)++; /* XXX: make sure we don't timeout early */ \ (hash) %= BW_METER_BUCKETS; \ } while (/*CONSTCOND*/ 0) /* * Schedule a timer to process periodically bw_meter entry of type "<=" * by linking the entry in the proper hash bucket. */ static void schedule_bw_meter(struct bw_meter *x, struct timeval *nowp) { int time_hash; if (!(x->bm_flags & BW_METER_LEQ)) return; /* XXX: we schedule timers only for "<=" entries */ /* * Reset the bw_meter entry */ x->bm_start_time = *nowp; x->bm_measured.b_packets = 0; x->bm_measured.b_bytes = 0; x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; /* * Compute the timeout hash value and insert the entry */ BW_METER_TIMEHASH(x, time_hash); x->bm_time_next = bw_meter_timers[time_hash]; bw_meter_timers[time_hash] = x; x->bm_time_hash = time_hash; } /* * Unschedule the periodic timer that processes bw_meter entry of type "<=" * by removing the entry from the proper hash bucket. */ static void unschedule_bw_meter(struct bw_meter *x) { int time_hash; struct bw_meter *prev, *tmp; if (!(x->bm_flags & BW_METER_LEQ)) return; /* XXX: we schedule timers only for "<=" entries */ /* * Compute the timeout hash value and delete the entry */ time_hash = x->bm_time_hash; if (time_hash >= BW_METER_BUCKETS) return; /* Entry was not scheduled */ for (prev = NULL, tmp = bw_meter_timers[time_hash]; tmp != NULL; prev = tmp, tmp = tmp->bm_time_next) if (tmp == x) break; if (tmp == NULL) panic("unschedule_bw_meter: bw_meter entry not found"); if (prev != NULL) prev->bm_time_next = x->bm_time_next; else bw_meter_timers[time_hash] = x->bm_time_next; x->bm_time_next = NULL; x->bm_time_hash = BW_METER_BUCKETS; } /* * Process all "<=" type of bw_meter that should be processed now, * and for each entry prepare an upcall if necessary. Each processed * entry is rescheduled again for the (periodic) processing. * * This is run periodically (once per second normally). On each round, * all the potentially matching entries are in the hash slot that we are * looking at. */ static void bw_meter_process(void) { int s; static uint32_t last_tv_sec; /* last time we processed this */ uint32_t loops; int i; struct timeval now, process_endtime; microtime(&now); if (last_tv_sec == now.tv_sec) return; /* nothing to do */ loops = now.tv_sec - last_tv_sec; last_tv_sec = now.tv_sec; if (loops > BW_METER_BUCKETS) loops = BW_METER_BUCKETS; s = splsoftnet(); /* * Process all bins of bw_meter entries from the one after the last * processed to the current one. On entry, i points to the last bucket * visited, so we need to increment i at the beginning of the loop. */ for (i = (now.tv_sec - loops) % BW_METER_BUCKETS; loops > 0; loops--) { struct bw_meter *x, *tmp_list; if (++i >= BW_METER_BUCKETS) i = 0; /* Disconnect the list of bw_meter entries from the bin */ tmp_list = bw_meter_timers[i]; bw_meter_timers[i] = NULL; /* Process the list of bw_meter entries */ while (tmp_list != NULL) { x = tmp_list; tmp_list = tmp_list->bm_time_next; /* Test if the time interval is over */ process_endtime = x->bm_start_time; BW_TIMEVALADD(&process_endtime, &x->bm_threshold.b_time); if (BW_TIMEVALCMP(&process_endtime, &now, >)) { /* Not yet: reschedule, but don't reset */ int time_hash; BW_METER_TIMEHASH(x, time_hash); if (time_hash == i && process_endtime.tv_sec == now.tv_sec) { /* * XXX: somehow the bin processing is a bit ahead of time. * Put the entry in the next bin. */ if (++time_hash >= BW_METER_BUCKETS) time_hash = 0; } x->bm_time_next = bw_meter_timers[time_hash]; bw_meter_timers[time_hash] = x; x->bm_time_hash = time_hash; continue; } /* * Test if we should deliver an upcall */ if (((x->bm_flags & BW_METER_UNIT_PACKETS) && (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || ((x->bm_flags & BW_METER_UNIT_BYTES) && (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { /* Prepare an upcall for delivery */ bw_meter_prepare_upcall(x, &now); } /* * Reschedule for next processing */ schedule_bw_meter(x, &now); } } /* Send all upcalls that are pending delivery */ bw_upcalls_send(); splx(s); } /* * A periodic function for sending all upcalls that are pending delivery */ static void expire_bw_upcalls_send(void *unused) { int s; s = splsoftnet(); bw_upcalls_send(); splx(s); callout_reset(&bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send, NULL); } /* * A periodic function for periodic scanning of the multicast forwarding * table for processing all "<=" bw_meter entries. */ static void expire_bw_meter_process(void *unused) { if (mrt_api_config & MRT_MFC_BW_UPCALL) bw_meter_process(); callout_reset(&bw_meter_ch, BW_METER_PERIOD, expire_bw_meter_process, NULL); } /* * End of bandwidth monitoring code */ #ifdef PIM /* * Send the packet up to the user daemon, or eventually do kernel encapsulation */ static int pim_register_send(struct ip *ip, struct vif *vifp, struct mbuf *m, struct mfc *rt) { struct mbuf *mb_copy, *mm; if (mrtdebug & DEBUG_PIM) log(LOG_DEBUG, "pim_register_send: \n"); mb_copy = pim_register_prepare(ip, m); if (mb_copy == NULL) return ENOBUFS; /* * Send all the fragments. Note that the mbuf for each fragment * is freed by the sending machinery. */ for (mm = mb_copy; mm; mm = mb_copy) { mb_copy = mm->m_nextpkt; mm->m_nextpkt = NULL; mm = m_pullup(mm, sizeof(struct ip)); if (mm != NULL) { ip = mtod(mm, struct ip *); if ((mrt_api_config & MRT_MFC_RP) && !in_nullhost(rt->mfc_rp)) { pim_register_send_rp(ip, vifp, mm, rt); } else { pim_register_send_upcall(ip, vifp, mm, rt); } } } return 0; } /* * Return a copy of the data packet that is ready for PIM Register * encapsulation. * XXX: Note that in the returned copy the IP header is a valid one. */ static struct mbuf * pim_register_prepare(struct ip *ip, struct mbuf *m) { struct mbuf *mb_copy = NULL; int mtu; /* Take care of delayed checksums */ if (m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { in_undefer_cksum_tcpudp(m); m->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); } /* * Copy the old packet & pullup its IP header into the * new mbuf so we can modify it. */ mb_copy = m_copypacket(m, M_DONTWAIT); if (mb_copy == NULL) return NULL; mb_copy = m_pullup(mb_copy, ip->ip_hl << 2); if (mb_copy == NULL) return NULL; /* take care of the TTL */ ip = mtod(mb_copy, struct ip *); --ip->ip_ttl; /* Compute the MTU after the PIM Register encapsulation */ mtu = 0xffff - sizeof(pim_encap_iphdr) - sizeof(pim_encap_pimhdr); if (ntohs(ip->ip_len) <= mtu) { /* Turn the IP header into a valid one */ ip->ip_sum = 0; ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); } else { /* Fragment the packet */ if (ip_fragment(mb_copy, NULL, mtu) != 0) { /* XXX: mb_copy was freed by ip_fragment() */ return NULL; } } return mb_copy; } /* * Send an upcall with the data packet to the user-level process. */ static int pim_register_send_upcall(struct ip *ip, struct vif *vifp, struct mbuf *mb_copy, struct mfc *rt) { struct mbuf *mb_first; int len = ntohs(ip->ip_len); struct igmpmsg *im; struct sockaddr_in k_igmpsrc = { .sin_len = sizeof(k_igmpsrc), .sin_family = AF_INET, }; /* * Add a new mbuf with an upcall header */ MGETHDR(mb_first, M_DONTWAIT, MT_HEADER); if (mb_first == NULL) { m_freem(mb_copy); return ENOBUFS; } mb_first->m_data += max_linkhdr; mb_first->m_pkthdr.len = len + sizeof(struct igmpmsg); mb_first->m_len = sizeof(struct igmpmsg); mb_first->m_next = mb_copy; /* Send message to routing daemon */ im = mtod(mb_first, struct igmpmsg *); im->im_msgtype = IGMPMSG_WHOLEPKT; im->im_mbz = 0; im->im_vif = vifp - viftable; im->im_src = ip->ip_src; im->im_dst = ip->ip_dst; k_igmpsrc.sin_addr = ip->ip_src; mrtstat.mrts_upcalls++; if (socket_send(ip_mrouter, mb_first, &k_igmpsrc) < 0) { if (mrtdebug & DEBUG_PIM) log(LOG_WARNING, "mcast: pim_register_send_upcall: ip_mrouter socket queue full\n"); ++mrtstat.mrts_upq_sockfull; return ENOBUFS; } /* Keep statistics */ pimstat.pims_snd_registers_msgs++; pimstat.pims_snd_registers_bytes += len; return 0; } /* * Encapsulate the data packet in PIM Register message and send it to the RP. */ static int pim_register_send_rp(struct ip *ip, struct vif *vifp, struct mbuf *mb_copy, struct mfc *rt) { struct mbuf *mb_first; struct ip *ip_outer; struct pim_encap_pimhdr *pimhdr; int len = ntohs(ip->ip_len); vifi_t vifi = rt->mfc_parent; if ((vifi >= numvifs) || in_nullhost(viftable[vifi].v_lcl_addr)) { m_freem(mb_copy); return EADDRNOTAVAIL; /* The iif vif is invalid */ } /* * Add a new mbuf with the encapsulating header */ MGETHDR(mb_first, M_DONTWAIT, MT_HEADER); if (mb_first == NULL) { m_freem(mb_copy); return ENOBUFS; } mb_first->m_data += max_linkhdr; mb_first->m_len = sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr); mb_first->m_next = mb_copy; mb_first->m_pkthdr.len = len + mb_first->m_len; /* * Fill in the encapsulating IP and PIM header */ ip_outer = mtod(mb_first, struct ip *); *ip_outer = pim_encap_iphdr; if (mb_first->m_pkthdr.len < IP_MINFRAGSIZE) ip_outer->ip_id = 0; else ip_outer->ip_id = ip_newid(NULL); ip_outer->ip_len = htons(len + sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr)); ip_outer->ip_src = viftable[vifi].v_lcl_addr; ip_outer->ip_dst = rt->mfc_rp; /* * Copy the inner header TOS to the outer header, and take care of the * IP_DF bit. */ ip_outer->ip_tos = ip->ip_tos; if (ntohs(ip->ip_off) & IP_DF) ip_outer->ip_off |= htons(IP_DF); pimhdr = (struct pim_encap_pimhdr *)((char *)ip_outer + sizeof(pim_encap_iphdr)); *pimhdr = pim_encap_pimhdr; /* If the iif crosses a border, set the Border-bit */ if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_BORDER_VIF & mrt_api_config) pimhdr->flags |= htonl(PIM_BORDER_REGISTER); mb_first->m_data += sizeof(pim_encap_iphdr); pimhdr->pim.pim_cksum = in_cksum(mb_first, sizeof(pim_encap_pimhdr)); mb_first->m_data -= sizeof(pim_encap_iphdr); if (vifp->v_rate_limit == 0) tbf_send_packet(vifp, mb_first); else tbf_control(vifp, mb_first, ip, ntohs(ip_outer->ip_len)); /* Keep statistics */ pimstat.pims_snd_registers_msgs++; pimstat.pims_snd_registers_bytes += len; return 0; } /* * PIM-SMv2 and PIM-DM messages processing. * Receives and verifies the PIM control messages, and passes them * up to the listening socket, using rip_input(). * The only message with special processing is the PIM_REGISTER message * (used by PIM-SM): the PIM header is stripped off, and the inner packet * is passed to if_simloop(). */ void pim_input(struct mbuf *m, int off, int proto) { struct ip *ip = mtod(m, struct ip *); struct pim *pim; int minlen; int datalen; int ip_tos; int iphlen; iphlen = off; datalen = ntohs(ip->ip_len) - iphlen; /* Keep statistics */ pimstat.pims_rcv_total_msgs++; pimstat.pims_rcv_total_bytes += datalen; /* * Validate lengths */ if (datalen < PIM_MINLEN) { pimstat.pims_rcv_tooshort++; log(LOG_ERR, "pim_input: packet size too small %d from %lx\n", datalen, (u_long)ip->ip_src.s_addr); m_freem(m); return; } /* * If the packet is at least as big as a REGISTER, go ahead * and grab the PIM REGISTER header size, to avoid another * possible m_pullup() later. * * PIM_MINLEN == pimhdr + u_int32_t == 4 + 4 = 8 * PIM_REG_MINLEN == pimhdr + reghdr + encap_iphdr == 4 + 4 + 20 = 28 */ minlen = iphlen + (datalen >= PIM_REG_MINLEN ? PIM_REG_MINLEN : PIM_MINLEN); /* * Get the IP and PIM headers in contiguous memory, and * possibly the PIM REGISTER header. */ if ((m->m_flags & M_EXT || m->m_len < minlen) && (m = m_pullup(m, minlen)) == NULL) { log(LOG_ERR, "pim_input: m_pullup failure\n"); return; } ip = mtod(m, struct ip *); ip_tos = ip->ip_tos; /* adjust mbuf to point to the PIM header */ m->m_data += iphlen; m->m_len -= iphlen; pim = mtod(m, struct pim *); /* * Validate checksum. If PIM REGISTER, exclude the data packet. * * XXX: some older PIMv2 implementations don't make this distinction, * so for compatibility reason perform the checksum over part of the * message, and if error, then over the whole message. */ if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER && in_cksum(m, PIM_MINLEN) == 0) { /* do nothing, checksum okay */ } else if (in_cksum(m, datalen)) { pimstat.pims_rcv_badsum++; if (mrtdebug & DEBUG_PIM) log(LOG_DEBUG, "pim_input: invalid checksum\n"); m_freem(m); return; } /* PIM version check */ if (PIM_VT_V(pim->pim_vt) < PIM_VERSION) { pimstat.pims_rcv_badversion++; log(LOG_ERR, "pim_input: incorrect version %d, expecting %d\n", PIM_VT_V(pim->pim_vt), PIM_VERSION); m_freem(m); return; } /* restore mbuf back to the outer IP */ m->m_data -= iphlen; m->m_len += iphlen; if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER) { /* * Since this is a REGISTER, we'll make a copy of the register * headers ip + pim + u_int32 + encap_ip, to be passed up to the * routing daemon. */ int s; struct sockaddr_in dst = { .sin_len = sizeof(dst), .sin_family = AF_INET, }; struct mbuf *mcp; struct ip *encap_ip; u_int32_t *reghdr; struct ifnet *vifp; s = splsoftnet(); if ((reg_vif_num >= numvifs) || (reg_vif_num == VIFI_INVALID)) { splx(s); if (mrtdebug & DEBUG_PIM) log(LOG_DEBUG, "pim_input: register vif not set: %d\n", reg_vif_num); m_freem(m); return; } /* XXX need refcnt? */ vifp = viftable[reg_vif_num].v_ifp; splx(s); /* * Validate length */ if (datalen < PIM_REG_MINLEN) { pimstat.pims_rcv_tooshort++; pimstat.pims_rcv_badregisters++; log(LOG_ERR, "pim_input: register packet size too small %d from %lx\n", datalen, (u_long)ip->ip_src.s_addr); m_freem(m); return; } reghdr = (u_int32_t *)(pim + 1); encap_ip = (struct ip *)(reghdr + 1); if (mrtdebug & DEBUG_PIM) { log(LOG_DEBUG, "pim_input[register], encap_ip: %lx -> %lx, encap_ip len %d\n", (u_long)ntohl(encap_ip->ip_src.s_addr), (u_long)ntohl(encap_ip->ip_dst.s_addr), ntohs(encap_ip->ip_len)); } /* verify the version number of the inner packet */ if (encap_ip->ip_v != IPVERSION) { pimstat.pims_rcv_badregisters++; if (mrtdebug & DEBUG_PIM) { log(LOG_DEBUG, "pim_input: invalid IP version (%d) " "of the inner packet\n", encap_ip->ip_v); } m_freem(m); return; } /* verify the inner packet doesn't have options */ if (encap_ip->ip_hl != (sizeof(struct ip) >> 2)) { pimstat.pims_rcv_badregisters++; m_freem(m); return; } /* verify the inner packet is destined to a mcast group */ if (!IN_MULTICAST(encap_ip->ip_dst.s_addr)) { pimstat.pims_rcv_badregisters++; if (mrtdebug & DEBUG_PIM) log(LOG_DEBUG, "pim_input: inner packet of register is not " "multicast %lx\n", (u_long)ntohl(encap_ip->ip_dst.s_addr)); m_freem(m); return; } /* If a NULL_REGISTER, pass it to the daemon */ if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) goto pim_input_to_daemon; /* * Copy the TOS from the outer IP header to the inner IP header. */ if (encap_ip->ip_tos != ip_tos) { /* Outer TOS -> inner TOS */ encap_ip->ip_tos = ip_tos; /* Recompute the inner header checksum. Sigh... */ /* adjust mbuf to point to the inner IP header */ m->m_data += (iphlen + PIM_MINLEN); m->m_len -= (iphlen + PIM_MINLEN); encap_ip->ip_sum = 0; encap_ip->ip_sum = in_cksum(m, encap_ip->ip_hl << 2); /* restore mbuf to point back to the outer IP header */ m->m_data -= (iphlen + PIM_MINLEN); m->m_len += (iphlen + PIM_MINLEN); } /* * Decapsulate the inner IP packet and loopback to forward it * as a normal multicast packet. Also, make a copy of the * outer_iphdr + pimhdr + reghdr + encap_iphdr * to pass to the daemon later, so it can take the appropriate * actions (e.g., send back PIM_REGISTER_STOP). * XXX: here m->m_data points to the outer IP header. */ mcp = m_copym(m, 0, iphlen + PIM_REG_MINLEN, M_DONTWAIT); if (mcp == NULL) { log(LOG_ERR, "pim_input: pim register: could not copy register head\n"); m_freem(m); return; } /* Keep statistics */ /* XXX: registers_bytes include only the encap. mcast pkt */ pimstat.pims_rcv_registers_msgs++; pimstat.pims_rcv_registers_bytes += ntohs(encap_ip->ip_len); /* * forward the inner ip packet; point m_data at the inner ip. */ m_adj(m, iphlen + PIM_MINLEN); if (mrtdebug & DEBUG_PIM) { log(LOG_DEBUG, "pim_input: forwarding decapsulated register: " "src %lx, dst %lx, vif %d\n", (u_long)ntohl(encap_ip->ip_src.s_addr), (u_long)ntohl(encap_ip->ip_dst.s_addr), reg_vif_num); } /* NB: vifp was collected above; can it change on us? */ looutput(vifp, m, (struct sockaddr *)&dst, NULL); /* prepare the register head to send to the mrouting daemon */ m = mcp; } pim_input_to_daemon: /* * Pass the PIM message up to the daemon; if it is a Register message, * pass the 'head' only up to the daemon. This includes the * outer IP header, PIM header, PIM-Register header and the * inner IP header. * XXX: the outer IP header pkt size of a Register is not adjust to * reflect the fact that the inner multicast data is truncated. */ /* * Currently, pim_input() is always called holding softnet_lock * by ipintr()(!NET_MPSAFE) or PR_INPUT_WRAP()(NET_MPSAFE). */ KASSERT(mutex_owned(softnet_lock)); rip_input(m, iphlen, proto); return; } #endif /* PIM */