/* $OpenBSD: altq_blue.c,v 1.6 2002/06/14 21:34:58 todd Exp $ */ /* $KAME: altq_blue.c,v 1.9 2002/04/03 05:38:50 kjc Exp $ */ /* * Copyright (C) 1997-2002 * Sony Computer Science Laboratories Inc. All rights reserved. * * 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. * * THIS SOFTWARE IS PROVIDED BY SONY CSL 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 SONY CSL 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. * */ /* * Copyright (c) 1990-1994 Regents of the University of California. * All rights reserved. * * 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 Computer Systems * Engineering Group at Lawrence Berkeley Laboratory. * 4. Neither the name of the University nor of the Laboratory 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. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET6 #include #endif #include #include #include /* * Blue is proposed and implemented by Wu-chang Feng . * more information on Blue is available from * http://www.eecs.umich.edu/~wuchang/blue/ */ /* fixed-point uses 12-bit decimal places */ #define FP_SHIFT 12 /* fixed-point shift */ #define BLUE_LIMIT 200 /* default max queue length */ #define BLUE_STATS /* collect statistics */ /* blue_list keeps all blue_state_t's allocated. */ static blue_queue_t *blue_list = NULL; /* internal function prototypes */ static int blue_enqueue(struct ifaltq *, struct mbuf *, struct altq_pktattr *); static struct mbuf *blue_dequeue(struct ifaltq *, int); static int drop_early(blue_t *); static int mark_ecn(struct mbuf *, struct altq_pktattr *, int); static int blue_detach(blue_queue_t *); static int blue_request(struct ifaltq *, int, void *); /* * blue device interface */ altqdev_decl(blue); int blueopen(dev, flag, fmt, p) dev_t dev; int flag, fmt; struct proc *p; { /* everything will be done when the queueing scheme is attached. */ return 0; } int blueclose(dev, flag, fmt, p) dev_t dev; int flag, fmt; struct proc *p; { blue_queue_t *rqp; int err, error = 0; while ((rqp = blue_list) != NULL) { /* destroy all */ err = blue_detach(rqp); if (err != 0 && error == 0) error = err; } return error; } int blueioctl(dev, cmd, addr, flag, p) dev_t dev; ioctlcmd_t cmd; caddr_t addr; int flag; struct proc *p; { blue_queue_t *rqp; struct blue_interface *ifacep; struct ifnet *ifp; int error = 0; /* check super-user privilege */ switch (cmd) { case BLUE_GETSTATS: break; default: #if (__FreeBSD_version > 400000) if ((error = suser(p)) != 0) return (error); #else if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) return (error); #endif break; } switch (cmd) { case BLUE_ENABLE: ifacep = (struct blue_interface *)addr; if ((rqp = altq_lookup(ifacep->blue_ifname, ALTQT_BLUE)) == NULL) { error = EBADF; break; } error = altq_enable(rqp->rq_ifq); break; case BLUE_DISABLE: ifacep = (struct blue_interface *)addr; if ((rqp = altq_lookup(ifacep->blue_ifname, ALTQT_BLUE)) == NULL) { error = EBADF; break; } error = altq_disable(rqp->rq_ifq); break; case BLUE_IF_ATTACH: ifp = ifunit(((struct blue_interface *)addr)->blue_ifname); if (ifp == NULL) { error = ENXIO; break; } /* allocate and initialize blue_state_t */ MALLOC(rqp, blue_queue_t *, sizeof(blue_queue_t), M_DEVBUF, M_WAITOK); bzero(rqp, sizeof(blue_queue_t)); MALLOC(rqp->rq_q, class_queue_t *, sizeof(class_queue_t), M_DEVBUF, M_WAITOK); bzero(rqp->rq_q, sizeof(class_queue_t)); MALLOC(rqp->rq_blue, blue_t *, sizeof(blue_t), M_DEVBUF, M_WAITOK); bzero(rqp->rq_blue, sizeof(blue_t)); rqp->rq_ifq = &ifp->if_snd; qtail(rqp->rq_q) = NULL; qlen(rqp->rq_q) = 0; qlimit(rqp->rq_q) = BLUE_LIMIT; /* default packet time: 1000 bytes / 10Mbps * 8 * 1000000 */ blue_init(rqp->rq_blue, 0, 800, 1000, 50000); /* * set BLUE to this ifnet structure. */ error = altq_attach(rqp->rq_ifq, ALTQT_BLUE, rqp, blue_enqueue, blue_dequeue, blue_request, NULL, NULL); if (error) { FREE(rqp->rq_blue, M_DEVBUF); FREE(rqp->rq_q, M_DEVBUF); FREE(rqp, M_DEVBUF); break; } /* add this state to the blue list */ rqp->rq_next = blue_list; blue_list = rqp; break; case BLUE_IF_DETACH: ifacep = (struct blue_interface *)addr; if ((rqp = altq_lookup(ifacep->blue_ifname, ALTQT_BLUE)) == NULL) { error = EBADF; break; } error = blue_detach(rqp); break; case BLUE_GETSTATS: do { struct blue_stats *q_stats; blue_t *rp; q_stats = (struct blue_stats *)addr; if ((rqp = altq_lookup(q_stats->iface.blue_ifname, ALTQT_BLUE)) == NULL) { error = EBADF; break; } q_stats->q_len = qlen(rqp->rq_q); q_stats->q_limit = qlimit(rqp->rq_q); rp = rqp->rq_blue; q_stats->q_pmark = rp->blue_pmark; q_stats->xmit_packets = rp->blue_stats.xmit_packets; q_stats->xmit_bytes = rp->blue_stats.xmit_bytes; q_stats->drop_packets = rp->blue_stats.drop_packets; q_stats->drop_bytes = rp->blue_stats.drop_bytes; q_stats->drop_forced = rp->blue_stats.drop_forced; q_stats->drop_unforced = rp->blue_stats.drop_unforced; q_stats->marked_packets = rp->blue_stats.marked_packets; } while (0); break; case BLUE_CONFIG: do { struct blue_conf *fc; int limit; fc = (struct blue_conf *)addr; if ((rqp = altq_lookup(fc->iface.blue_ifname, ALTQT_BLUE)) == NULL) { error = EBADF; break; } limit = fc->blue_limit; qlimit(rqp->rq_q) = limit; fc->blue_limit = limit; /* write back the new value */ if (fc->blue_pkttime > 0) rqp->rq_blue->blue_pkttime = fc->blue_pkttime; if (fc->blue_max_pmark > 0) rqp->rq_blue->blue_max_pmark = fc->blue_max_pmark; if (fc->blue_hold_time > 0) rqp->rq_blue->blue_hold_time = fc->blue_hold_time; rqp->rq_blue->blue_flags = fc->blue_flags; blue_init(rqp->rq_blue, rqp->rq_blue->blue_flags, rqp->rq_blue->blue_pkttime, rqp->rq_blue->blue_max_pmark, rqp->rq_blue->blue_hold_time); } while (0); break; default: error = EINVAL; break; } return error; } static int blue_detach(rqp) blue_queue_t *rqp; { blue_queue_t *tmp; int error = 0; if (ALTQ_IS_ENABLED(rqp->rq_ifq)) altq_disable(rqp->rq_ifq); if ((error = altq_detach(rqp->rq_ifq))) return (error); if (blue_list == rqp) blue_list = rqp->rq_next; else { for (tmp = blue_list; tmp != NULL; tmp = tmp->rq_next) if (tmp->rq_next == rqp) { tmp->rq_next = rqp->rq_next; break; } if (tmp == NULL) printf("blue_detach: no state found in blue_list!\n"); } FREE(rqp->rq_q, M_DEVBUF); FREE(rqp->rq_blue, M_DEVBUF); FREE(rqp, M_DEVBUF); return (error); } /* * blue support routines */ int blue_init(rp, flags, pkttime, blue_max_pmark, blue_hold_time) blue_t *rp; int flags; int pkttime; int blue_max_pmark; int blue_hold_time; { int npkts_per_sec; rp->blue_idle = 1; rp->blue_flags = flags; rp->blue_pkttime = pkttime; rp->blue_max_pmark = blue_max_pmark; rp->blue_hold_time = blue_hold_time; if (pkttime == 0) rp->blue_pkttime = 1; /* when the link is very slow, adjust blue parameters */ npkts_per_sec = 1000000 / rp->blue_pkttime; if (npkts_per_sec < 50) { } else if (npkts_per_sec < 300) { } microtime(&rp->blue_last); return (0); } /* * enqueue routine: * * returns: 0 when successfully queued. * ENOBUFS when drop occurs. */ static int blue_enqueue(ifq, m, pktattr) struct ifaltq *ifq; struct mbuf *m; struct altq_pktattr *pktattr; { blue_queue_t *rqp = (blue_queue_t *)ifq->altq_disc; int error = 0; if (blue_addq(rqp->rq_blue, rqp->rq_q, m, pktattr) == 0) ifq->ifq_len++; else error = ENOBUFS; return error; } #define DTYPE_NODROP 0 /* no drop */ #define DTYPE_FORCED 1 /* a "forced" drop */ #define DTYPE_EARLY 2 /* an "unforced" (early) drop */ int blue_addq(rp, q, m, pktattr) blue_t *rp; class_queue_t *q; struct mbuf *m; struct altq_pktattr *pktattr; { int droptype; /* * if we were idle, this is an enqueue onto an empty queue * and we should decrement marking probability * */ if (rp->blue_idle) { struct timeval now; int t; rp->blue_idle = 0; microtime(&now); t = (now.tv_sec - rp->blue_last.tv_sec); if ( t > 1) { rp->blue_pmark = 1; microtime(&rp->blue_last); } else { t = t * 1000000 + (now.tv_usec - rp->blue_last.tv_usec); if (t > rp->blue_hold_time) { rp->blue_pmark--; if (rp->blue_pmark < 0) rp->blue_pmark = 0; microtime(&rp->blue_last); } } } /* see if we drop early */ droptype = DTYPE_NODROP; if (drop_early(rp) && qlen(q) > 1) { /* mark or drop by blue */ if ((rp->blue_flags & BLUEF_ECN) && mark_ecn(m, pktattr, rp->blue_flags)) { /* successfully marked. do not drop. */ #ifdef BLUE_STATS rp->blue_stats.marked_packets++; #endif } else { /* unforced drop by blue */ droptype = DTYPE_EARLY; } } /* * if the queue length hits the hard limit, it's a forced drop. */ if (droptype == DTYPE_NODROP && qlen(q) >= qlimit(q)) droptype = DTYPE_FORCED; /* if successful or forced drop, enqueue this packet. */ if (droptype != DTYPE_EARLY) _addq(q, m); if (droptype != DTYPE_NODROP) { if (droptype == DTYPE_EARLY) { /* drop the incoming packet */ #ifdef BLUE_STATS rp->blue_stats.drop_unforced++; #endif } else { struct timeval now; int t; /* forced drop, select a victim packet in the queue. */ m = _getq_random(q); microtime(&now); t = (now.tv_sec - rp->blue_last.tv_sec); t = t * 1000000 + (now.tv_usec - rp->blue_last.tv_usec); if (t > rp->blue_hold_time) { rp->blue_pmark += rp->blue_max_pmark >> 3; if (rp->blue_pmark > rp->blue_max_pmark) rp->blue_pmark = rp->blue_max_pmark; microtime(&rp->blue_last); } #ifdef BLUE_STATS rp->blue_stats.drop_forced++; #endif } #ifdef BLUE_STATS rp->blue_stats.drop_packets++; rp->blue_stats.drop_bytes += m->m_pkthdr.len; #endif m_freem(m); return (-1); } /* successfully queued */ return (0); } /* * early-drop probability is kept in blue_pmark * */ static int drop_early(rp) blue_t *rp; { if ((random() % rp->blue_max_pmark) < rp->blue_pmark) { /* drop or mark */ return (1); } /* no drop/mark */ return (0); } /* * try to mark CE bit to the packet. * returns 1 if successfully marked, 0 otherwise. */ static int mark_ecn(m, pktattr, flags) struct mbuf *m; struct altq_pktattr *pktattr; int flags; { struct mbuf *m0; if (pktattr == NULL || (pktattr->pattr_af != AF_INET && pktattr->pattr_af != AF_INET6)) return (0); /* verify that pattr_hdr is within the mbuf data */ for (m0 = m; m0 != NULL; m0 = m0->m_next) if ((pktattr->pattr_hdr >= m0->m_data) && (pktattr->pattr_hdr < m0->m_data + m0->m_len)) break; if (m0 == NULL) { /* ick, pattr_hdr is stale */ pktattr->pattr_af = AF_UNSPEC; return (0); } switch (pktattr->pattr_af) { case AF_INET: if (flags & BLUEF_ECN4) { struct ip *ip = (struct ip *)pktattr->pattr_hdr; u_int8_t otos; int sum; if (ip->ip_v != 4) return (0); /* version mismatch! */ if ((ip->ip_tos & IPTOS_ECN_MASK) == IPTOS_ECN_NOTECT) return (0); /* not-ECT */ if ((ip->ip_tos & IPTOS_ECN_MASK) == IPTOS_ECN_CE) return (1); /* already marked */ /* * ecn-capable but not marked, * mark CE and update checksum */ otos = ip->ip_tos; ip->ip_tos |= IPTOS_ECN_CE; /* * update checksum (from RFC1624) * HC' = ~(~HC + ~m + m') */ sum = ~ntohs(ip->ip_sum) & 0xffff; sum += (~otos & 0xffff) + ip->ip_tos; sum = (sum >> 16) + (sum & 0xffff); sum += (sum >> 16); /* add carry */ ip->ip_sum = htons(~sum & 0xffff); return (1); } break; #ifdef INET6 case AF_INET6: if (flags & BLUEF_ECN6) { struct ip6_hdr *ip6 = (struct ip6_hdr *)pktattr->pattr_hdr; u_int32_t flowlabel; flowlabel = ntohl(ip6->ip6_flow); if ((flowlabel >> 28) != 6) return (0); /* version mismatch! */ if ((flowlabel & (IPTOS_ECN_MASK << 20)) == (IPTOS_ECN_NOTECT << 20)) return (0); /* not-ECT */ if ((flowlabel & (IPTOS_ECN_MASK << 20)) == (IPTOS_ECN_CE << 20)) return (1); /* already marked */ /* * ecn-capable but not marked, mark CE */ flowlabel |= (IPTOS_ECN_CE << 20); ip6->ip6_flow = htonl(flowlabel); return (1); } break; #endif /* INET6 */ } /* not marked */ return (0); } /* * dequeue routine: * must be called in splimp. * * returns: mbuf dequeued. * NULL when no packet is available in the queue. */ static struct mbuf * blue_dequeue(ifq, op) struct ifaltq *ifq; int op; { blue_queue_t *rqp = (blue_queue_t *)ifq->altq_disc; struct mbuf *m = NULL; if (op == ALTDQ_POLL) return (qhead(rqp->rq_q)); m = blue_getq(rqp->rq_blue, rqp->rq_q); if (m != NULL) ifq->ifq_len--; return m; } struct mbuf *blue_getq(rp, q) blue_t *rp; class_queue_t *q; { struct mbuf *m; if ((m = _getq(q)) == NULL) { if (rp->blue_idle == 0) { rp->blue_idle = 1; microtime(&rp->blue_last); } return NULL; } rp->blue_idle = 0; #ifdef BLUE_STATS rp->blue_stats.xmit_packets++; rp->blue_stats.xmit_bytes += m->m_pkthdr.len; #endif return (m); } static int blue_request(ifq, req, arg) struct ifaltq *ifq; int req; void *arg; { blue_queue_t *rqp = (blue_queue_t *)ifq->altq_disc; switch (req) { case ALTRQ_PURGE: _flushq(rqp->rq_q); if (ALTQ_IS_ENABLED(ifq)) ifq->ifq_len = 0; break; } return (0); } #ifdef KLD_MODULE static struct altqsw blue_sw = {"blue", blueopen, blueclose, blueioctl}; ALTQ_MODULE(altq_blue, ALTQT_BLUE, &blue_sw); #endif /* KLD_MODULE */