diff options
Diffstat (limited to 'freebsd/sys/netpfil/ipfw/ip_dn_io.c')
| -rw-r--r-- | freebsd/sys/netpfil/ipfw/ip_dn_io.c | 852 |
1 files changed, 0 insertions, 852 deletions
diff --git a/freebsd/sys/netpfil/ipfw/ip_dn_io.c b/freebsd/sys/netpfil/ipfw/ip_dn_io.c deleted file mode 100644 index 23392a55..00000000 --- a/freebsd/sys/netpfil/ipfw/ip_dn_io.c +++ /dev/null @@ -1,852 +0,0 @@ -#include <machine/rtems-bsd-kernel-space.h> - -/*- - * Copyright (c) 2010 Luigi Rizzo, Riccardo Panicucci, Universita` di Pisa - * 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 THE AUTHOR 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 AUTHOR 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. - */ - -/* - * Dummynet portions related to packet handling. - */ -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#include <rtems/bsd/local/opt_inet6.h> - -#include <rtems/bsd/sys/param.h> -#include <sys/systm.h> -#include <sys/malloc.h> -#include <sys/mbuf.h> -#include <sys/kernel.h> -#include <rtems/bsd/sys/lock.h> -#include <sys/module.h> -#include <sys/priv.h> -#include <sys/proc.h> -#include <sys/rwlock.h> -#include <sys/socket.h> -#include <sys/time.h> -#include <sys/sysctl.h> - -#include <net/if.h> /* IFNAMSIZ, struct ifaddr, ifq head, lock.h mutex.h */ -#include <net/netisr.h> -#include <net/vnet.h> - -#include <netinet/in.h> -#include <netinet/ip.h> /* ip_len, ip_off */ -#include <netinet/ip_var.h> /* ip_output(), IP_FORWARDING */ -#include <netinet/ip_fw.h> -#include <netinet/ip_dummynet.h> -#include <netinet/if_ether.h> /* various ether_* routines */ -#include <netinet/ip6.h> /* for ip6_input, ip6_output prototypes */ -#include <netinet6/ip6_var.h> - -#include <netpfil/ipfw/ip_fw_private.h> -#include <netpfil/ipfw/dn_heap.h> -#include <netpfil/ipfw/ip_dn_private.h> -#include <netpfil/ipfw/dn_sched.h> - -/* - * We keep a private variable for the simulation time, but we could - * probably use an existing one ("softticks" in sys/kern/kern_timeout.c) - * instead of dn_cfg.curr_time - */ - -struct dn_parms dn_cfg; -//VNET_DEFINE(struct dn_parms, _base_dn_cfg); - -static long tick_last; /* Last tick duration (usec). */ -static long tick_delta; /* Last vs standard tick diff (usec). */ -static long tick_delta_sum; /* Accumulated tick difference (usec).*/ -static long tick_adjustment; /* Tick adjustments done. */ -static long tick_lost; /* Lost(coalesced) ticks number. */ -/* Adjusted vs non-adjusted curr_time difference (ticks). */ -static long tick_diff; - -static unsigned long io_pkt; -static unsigned long io_pkt_fast; -static unsigned long io_pkt_drop; - -/* - * We use a heap to store entities for which we have pending timer events. - * The heap is checked at every tick and all entities with expired events - * are extracted. - */ - -MALLOC_DEFINE(M_DUMMYNET, "dummynet", "dummynet heap"); - -extern void (*bridge_dn_p)(struct mbuf *, struct ifnet *); - -#ifdef SYSCTL_NODE - -SYSBEGIN(f4) - -SYSCTL_DECL(_net_inet); -SYSCTL_DECL(_net_inet_ip); -static SYSCTL_NODE(_net_inet_ip, OID_AUTO, dummynet, CTLFLAG_RW, 0, "Dummynet"); - -/* wrapper to pass dn_cfg fields to SYSCTL_* */ -//#define DC(x) (&(VNET_NAME(_base_dn_cfg).x)) -#define DC(x) (&(dn_cfg.x)) -/* parameters */ - -static int -sysctl_hash_size(SYSCTL_HANDLER_ARGS) -{ - int error, value; - - value = dn_cfg.hash_size; - error = sysctl_handle_int(oidp, &value, 0, req); - if (error != 0 || req->newptr == NULL) - return (error); - if (value < 16 || value > 65536) - return (EINVAL); - dn_cfg.hash_size = value; - return (0); -} - -SYSCTL_PROC(_net_inet_ip_dummynet, OID_AUTO, hash_size, - CTLTYPE_INT | CTLFLAG_RW, 0, 0, sysctl_hash_size, - "I", "Default hash table size"); - -static int -sysctl_limits(SYSCTL_HANDLER_ARGS) -{ - int error; - long value; - - if (arg2 != 0) - value = dn_cfg.slot_limit; - else - value = dn_cfg.byte_limit; - error = sysctl_handle_long(oidp, &value, 0, req); - - if (error != 0 || req->newptr == NULL) - return (error); - if (arg2 != 0) { - if (value < 1) - return (EINVAL); - dn_cfg.slot_limit = value; - } else { - if (value < 1500) - return (EINVAL); - dn_cfg.byte_limit = value; - } - return (0); -} - -SYSCTL_PROC(_net_inet_ip_dummynet, OID_AUTO, pipe_slot_limit, - CTLTYPE_LONG | CTLFLAG_RW, 0, 1, sysctl_limits, - "L", "Upper limit in slots for pipe queue."); -SYSCTL_PROC(_net_inet_ip_dummynet, OID_AUTO, pipe_byte_limit, - CTLTYPE_LONG | CTLFLAG_RW, 0, 0, sysctl_limits, - "L", "Upper limit in bytes for pipe queue."); -SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, io_fast, - CTLFLAG_RW, DC(io_fast), 0, "Enable fast dummynet io."); -SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, debug, - CTLFLAG_RW, DC(debug), 0, "Dummynet debug level"); - -/* RED parameters */ -SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, red_lookup_depth, - CTLFLAG_RD, DC(red_lookup_depth), 0, "Depth of RED lookup table"); -SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, red_avg_pkt_size, - CTLFLAG_RD, DC(red_avg_pkt_size), 0, "RED Medium packet size"); -SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, red_max_pkt_size, - CTLFLAG_RD, DC(red_max_pkt_size), 0, "RED Max packet size"); - -/* time adjustment */ -SYSCTL_LONG(_net_inet_ip_dummynet, OID_AUTO, tick_delta, - CTLFLAG_RD, &tick_delta, 0, "Last vs standard tick difference (usec)."); -SYSCTL_LONG(_net_inet_ip_dummynet, OID_AUTO, tick_delta_sum, - CTLFLAG_RD, &tick_delta_sum, 0, "Accumulated tick difference (usec)."); -SYSCTL_LONG(_net_inet_ip_dummynet, OID_AUTO, tick_adjustment, - CTLFLAG_RD, &tick_adjustment, 0, "Tick adjustments done."); -SYSCTL_LONG(_net_inet_ip_dummynet, OID_AUTO, tick_diff, - CTLFLAG_RD, &tick_diff, 0, - "Adjusted vs non-adjusted curr_time difference (ticks)."); -SYSCTL_LONG(_net_inet_ip_dummynet, OID_AUTO, tick_lost, - CTLFLAG_RD, &tick_lost, 0, - "Number of ticks coalesced by dummynet taskqueue."); - -/* Drain parameters */ -SYSCTL_UINT(_net_inet_ip_dummynet, OID_AUTO, expire, - CTLFLAG_RW, DC(expire), 0, "Expire empty queues/pipes"); -SYSCTL_UINT(_net_inet_ip_dummynet, OID_AUTO, expire_cycle, - CTLFLAG_RD, DC(expire_cycle), 0, "Expire cycle for queues/pipes"); - -/* statistics */ -SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, schk_count, - CTLFLAG_RD, DC(schk_count), 0, "Number of schedulers"); -SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, si_count, - CTLFLAG_RD, DC(si_count), 0, "Number of scheduler instances"); -SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, fsk_count, - CTLFLAG_RD, DC(fsk_count), 0, "Number of flowsets"); -SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, queue_count, - CTLFLAG_RD, DC(queue_count), 0, "Number of queues"); -SYSCTL_ULONG(_net_inet_ip_dummynet, OID_AUTO, io_pkt, - CTLFLAG_RD, &io_pkt, 0, - "Number of packets passed to dummynet."); -SYSCTL_ULONG(_net_inet_ip_dummynet, OID_AUTO, io_pkt_fast, - CTLFLAG_RD, &io_pkt_fast, 0, - "Number of packets bypassed dummynet scheduler."); -SYSCTL_ULONG(_net_inet_ip_dummynet, OID_AUTO, io_pkt_drop, - CTLFLAG_RD, &io_pkt_drop, 0, - "Number of packets dropped by dummynet."); -#undef DC -SYSEND - -#endif - -static void dummynet_send(struct mbuf *); - -/* - * Packets processed by dummynet have an mbuf tag associated with - * them that carries their dummynet state. - * Outside dummynet, only the 'rule' field is relevant, and it must - * be at the beginning of the structure. - */ -struct dn_pkt_tag { - struct ipfw_rule_ref rule; /* matching rule */ - - /* second part, dummynet specific */ - int dn_dir; /* action when packet comes out.*/ - /* see ip_fw_private.h */ - uint64_t output_time; /* when the pkt is due for delivery*/ - struct ifnet *ifp; /* interface, for ip_output */ - struct _ip6dn_args ip6opt; /* XXX ipv6 options */ -}; - -/* - * Return the mbuf tag holding the dummynet state (it should - * be the first one on the list). - */ -static struct dn_pkt_tag * -dn_tag_get(struct mbuf *m) -{ - struct m_tag *mtag = m_tag_first(m); - KASSERT(mtag != NULL && - mtag->m_tag_cookie == MTAG_ABI_COMPAT && - mtag->m_tag_id == PACKET_TAG_DUMMYNET, - ("packet on dummynet queue w/o dummynet tag!")); - return (struct dn_pkt_tag *)(mtag+1); -} - -static inline void -mq_append(struct mq *q, struct mbuf *m) -{ - if (q->head == NULL) - q->head = m; - else - q->tail->m_nextpkt = m; - q->tail = m; - m->m_nextpkt = NULL; -} - -/* - * Dispose a list of packet. Use a functions so if we need to do - * more work, this is a central point to do it. - */ -void dn_free_pkts(struct mbuf *mnext) -{ - struct mbuf *m; - - while ((m = mnext) != NULL) { - mnext = m->m_nextpkt; - FREE_PKT(m); - } -} - -static int -red_drops (struct dn_queue *q, int len) -{ - /* - * RED algorithm - * - * RED calculates the average queue size (avg) using a low-pass filter - * with an exponential weighted (w_q) moving average: - * avg <- (1-w_q) * avg + w_q * q_size - * where q_size is the queue length (measured in bytes or * packets). - * - * If q_size == 0, we compute the idle time for the link, and set - * avg = (1 - w_q)^(idle/s) - * where s is the time needed for transmitting a medium-sized packet. - * - * Now, if avg < min_th the packet is enqueued. - * If avg > max_th the packet is dropped. Otherwise, the packet is - * dropped with probability P function of avg. - */ - - struct dn_fsk *fs = q->fs; - int64_t p_b = 0; - - /* Queue in bytes or packets? */ - uint32_t q_size = (fs->fs.flags & DN_QSIZE_BYTES) ? - q->ni.len_bytes : q->ni.length; - - /* Average queue size estimation. */ - if (q_size != 0) { - /* Queue is not empty, avg <- avg + (q_size - avg) * w_q */ - int diff = SCALE(q_size) - q->avg; - int64_t v = SCALE_MUL((int64_t)diff, (int64_t)fs->w_q); - - q->avg += (int)v; - } else { - /* - * Queue is empty, find for how long the queue has been - * empty and use a lookup table for computing - * (1 - * w_q)^(idle_time/s) where s is the time to send a - * (small) packet. - * XXX check wraps... - */ - if (q->avg) { - u_int t = div64((dn_cfg.curr_time - q->q_time), fs->lookup_step); - - q->avg = (t < fs->lookup_depth) ? - SCALE_MUL(q->avg, fs->w_q_lookup[t]) : 0; - } - } - - /* Should i drop? */ - if (q->avg < fs->min_th) { - q->count = -1; - return (0); /* accept packet */ - } - if (q->avg >= fs->max_th) { /* average queue >= max threshold */ - if (fs->fs.flags & DN_IS_GENTLE_RED) { - /* - * According to Gentle-RED, if avg is greater than - * max_th the packet is dropped with a probability - * p_b = c_3 * avg - c_4 - * where c_3 = (1 - max_p) / max_th - * c_4 = 1 - 2 * max_p - */ - p_b = SCALE_MUL((int64_t)fs->c_3, (int64_t)q->avg) - - fs->c_4; - } else { - q->count = -1; - return (1); - } - } else if (q->avg > fs->min_th) { - /* - * We compute p_b using the linear dropping function - * p_b = c_1 * avg - c_2 - * where c_1 = max_p / (max_th - min_th) - * c_2 = max_p * min_th / (max_th - min_th) - */ - p_b = SCALE_MUL((int64_t)fs->c_1, (int64_t)q->avg) - fs->c_2; - } - - if (fs->fs.flags & DN_QSIZE_BYTES) - p_b = div64((p_b * len) , fs->max_pkt_size); - if (++q->count == 0) - q->random = random() & 0xffff; - else { - /* - * q->count counts packets arrived since last drop, so a greater - * value of q->count means a greater packet drop probability. - */ - if (SCALE_MUL(p_b, SCALE((int64_t)q->count)) > q->random) { - q->count = 0; - /* After a drop we calculate a new random value. */ - q->random = random() & 0xffff; - return (1); /* drop */ - } - } - /* End of RED algorithm. */ - - return (0); /* accept */ - -} - -/* - * Enqueue a packet in q, subject to space and queue management policy - * (whose parameters are in q->fs). - * Update stats for the queue and the scheduler. - * Return 0 on success, 1 on drop. The packet is consumed anyways. - */ -int -dn_enqueue(struct dn_queue *q, struct mbuf* m, int drop) -{ - struct dn_fs *f; - struct dn_flow *ni; /* stats for scheduler instance */ - uint64_t len; - - if (q->fs == NULL || q->_si == NULL) { - printf("%s fs %p si %p, dropping\n", - __FUNCTION__, q->fs, q->_si); - FREE_PKT(m); - return 1; - } - f = &(q->fs->fs); - ni = &q->_si->ni; - len = m->m_pkthdr.len; - /* Update statistics, then check reasons to drop pkt. */ - q->ni.tot_bytes += len; - q->ni.tot_pkts++; - ni->tot_bytes += len; - ni->tot_pkts++; - if (drop) - goto drop; - if (f->plr && random() < f->plr) - goto drop; - if (f->flags & DN_IS_RED && red_drops(q, m->m_pkthdr.len)) - goto drop; - if (f->flags & DN_QSIZE_BYTES) { - if (q->ni.len_bytes > f->qsize) - goto drop; - } else if (q->ni.length >= f->qsize) { - goto drop; - } - mq_append(&q->mq, m); - q->ni.length++; - q->ni.len_bytes += len; - ni->length++; - ni->len_bytes += len; - return 0; - -drop: - io_pkt_drop++; - q->ni.drops++; - ni->drops++; - FREE_PKT(m); - return 1; -} - -/* - * Fetch packets from the delay line which are due now. If there are - * leftover packets, reinsert the delay line in the heap. - * Runs under scheduler lock. - */ -static void -transmit_event(struct mq *q, struct delay_line *dline, uint64_t now) -{ - struct mbuf *m; - struct dn_pkt_tag *pkt = NULL; - - dline->oid.subtype = 0; /* not in heap */ - while ((m = dline->mq.head) != NULL) { - pkt = dn_tag_get(m); - if (!DN_KEY_LEQ(pkt->output_time, now)) - break; - dline->mq.head = m->m_nextpkt; - mq_append(q, m); - } - if (m != NULL) { - dline->oid.subtype = 1; /* in heap */ - heap_insert(&dn_cfg.evheap, pkt->output_time, dline); - } -} - -/* - * Convert the additional MAC overheads/delays into an equivalent - * number of bits for the given data rate. The samples are - * in milliseconds so we need to divide by 1000. - */ -static uint64_t -extra_bits(struct mbuf *m, struct dn_schk *s) -{ - int index; - uint64_t bits; - struct dn_profile *pf = s->profile; - - if (!pf || pf->samples_no == 0) - return 0; - index = random() % pf->samples_no; - bits = div64((uint64_t)pf->samples[index] * s->link.bandwidth, 1000); - if (index >= pf->loss_level) { - struct dn_pkt_tag *dt = dn_tag_get(m); - if (dt) - dt->dn_dir = DIR_DROP; - } - return bits; -} - -/* - * Send traffic from a scheduler instance due by 'now'. - * Return a pointer to the head of the queue. - */ -static struct mbuf * -serve_sched(struct mq *q, struct dn_sch_inst *si, uint64_t now) -{ - struct mq def_q; - struct dn_schk *s = si->sched; - struct mbuf *m = NULL; - int delay_line_idle = (si->dline.mq.head == NULL); - int done, bw; - - if (q == NULL) { - q = &def_q; - q->head = NULL; - } - - bw = s->link.bandwidth; - si->kflags &= ~DN_ACTIVE; - - if (bw > 0) - si->credit += (now - si->sched_time) * bw; - else - si->credit = 0; - si->sched_time = now; - done = 0; - while (si->credit >= 0 && (m = s->fp->dequeue(si)) != NULL) { - uint64_t len_scaled; - - done++; - len_scaled = (bw == 0) ? 0 : hz * - (m->m_pkthdr.len * 8 + extra_bits(m, s)); - si->credit -= len_scaled; - /* Move packet in the delay line */ - dn_tag_get(m)->output_time = dn_cfg.curr_time + s->link.delay ; - mq_append(&si->dline.mq, m); - } - - /* - * If credit >= 0 the instance is idle, mark time. - * Otherwise put back in the heap, and adjust the output - * time of the last inserted packet, m, which was too early. - */ - if (si->credit >= 0) { - si->idle_time = now; - } else { - uint64_t t; - KASSERT (bw > 0, ("bw=0 and credit<0 ?")); - t = div64(bw - 1 - si->credit, bw); - if (m) - dn_tag_get(m)->output_time += t; - si->kflags |= DN_ACTIVE; - heap_insert(&dn_cfg.evheap, now + t, si); - } - if (delay_line_idle && done) - transmit_event(q, &si->dline, now); - return q->head; -} - -/* - * The timer handler for dummynet. Time is computed in ticks, but - * but the code is tolerant to the actual rate at which this is called. - * Once complete, the function reschedules itself for the next tick. - */ -void -dummynet_task(void *context, int pending) -{ - struct timeval t; - struct mq q = { NULL, NULL }; /* queue to accumulate results */ - - CURVNET_SET((struct vnet *)context); - - DN_BH_WLOCK(); - - /* Update number of lost(coalesced) ticks. */ - tick_lost += pending - 1; - - getmicrouptime(&t); - /* Last tick duration (usec). */ - tick_last = (t.tv_sec - dn_cfg.prev_t.tv_sec) * 1000000 + - (t.tv_usec - dn_cfg.prev_t.tv_usec); - /* Last tick vs standard tick difference (usec). */ - tick_delta = (tick_last * hz - 1000000) / hz; - /* Accumulated tick difference (usec). */ - tick_delta_sum += tick_delta; - - dn_cfg.prev_t = t; - - /* - * Adjust curr_time if the accumulated tick difference is - * greater than the 'standard' tick. Since curr_time should - * be monotonically increasing, we do positive adjustments - * as required, and throttle curr_time in case of negative - * adjustment. - */ - dn_cfg.curr_time++; - if (tick_delta_sum - tick >= 0) { - int diff = tick_delta_sum / tick; - - dn_cfg.curr_time += diff; - tick_diff += diff; - tick_delta_sum %= tick; - tick_adjustment++; - } else if (tick_delta_sum + tick <= 0) { - dn_cfg.curr_time--; - tick_diff--; - tick_delta_sum += tick; - tick_adjustment++; - } - - /* serve pending events, accumulate in q */ - for (;;) { - struct dn_id *p; /* generic parameter to handler */ - - if (dn_cfg.evheap.elements == 0 || - DN_KEY_LT(dn_cfg.curr_time, HEAP_TOP(&dn_cfg.evheap)->key)) - break; - p = HEAP_TOP(&dn_cfg.evheap)->object; - heap_extract(&dn_cfg.evheap, NULL); - - if (p->type == DN_SCH_I) { - serve_sched(&q, (struct dn_sch_inst *)p, dn_cfg.curr_time); - } else { /* extracted a delay line */ - transmit_event(&q, (struct delay_line *)p, dn_cfg.curr_time); - } - } - if (dn_cfg.expire && ++dn_cfg.expire_cycle >= dn_cfg.expire) { - dn_cfg.expire_cycle = 0; - dn_drain_scheduler(); - dn_drain_queue(); - } - - DN_BH_WUNLOCK(); - dn_reschedule(); - if (q.head != NULL) - dummynet_send(q.head); - CURVNET_RESTORE(); -} - -/* - * forward a chain of packets to the proper destination. - * This runs outside the dummynet lock. - */ -static void -dummynet_send(struct mbuf *m) -{ - struct mbuf *n; - - for (; m != NULL; m = n) { - struct ifnet *ifp = NULL; /* gcc 3.4.6 complains */ - struct m_tag *tag; - int dst; - - n = m->m_nextpkt; - m->m_nextpkt = NULL; - tag = m_tag_first(m); - if (tag == NULL) { /* should not happen */ - dst = DIR_DROP; - } else { - struct dn_pkt_tag *pkt = dn_tag_get(m); - /* extract the dummynet info, rename the tag - * to carry reinject info. - */ - dst = pkt->dn_dir; - ifp = pkt->ifp; - tag->m_tag_cookie = MTAG_IPFW_RULE; - tag->m_tag_id = 0; - } - - switch (dst) { - case DIR_OUT: - SET_HOST_IPLEN(mtod(m, struct ip *)); - ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); - break ; - - case DIR_IN : - /* put header in network format for ip_input() */ - //SET_NET_IPLEN(mtod(m, struct ip *)); - netisr_dispatch(NETISR_IP, m); - break; - -#ifdef INET6 - case DIR_IN | PROTO_IPV6: - netisr_dispatch(NETISR_IPV6, m); - break; - - case DIR_OUT | PROTO_IPV6: - ip6_output(m, NULL, NULL, IPV6_FORWARDING, NULL, NULL, NULL); - break; -#endif - - case DIR_FWD | PROTO_IFB: /* DN_TO_IFB_FWD: */ - if (bridge_dn_p != NULL) - ((*bridge_dn_p)(m, ifp)); - else - printf("dummynet: if_bridge not loaded\n"); - - break; - - case DIR_IN | PROTO_LAYER2: /* DN_TO_ETH_DEMUX: */ - /* - * The Ethernet code assumes the Ethernet header is - * contiguous in the first mbuf header. - * Insure this is true. - */ - if (m->m_len < ETHER_HDR_LEN && - (m = m_pullup(m, ETHER_HDR_LEN)) == NULL) { - printf("dummynet/ether: pullup failed, " - "dropping packet\n"); - break; - } - ether_demux(m->m_pkthdr.rcvif, m); - break; - - case DIR_OUT | PROTO_LAYER2: /* N_TO_ETH_OUT: */ - ether_output_frame(ifp, m); - break; - - case DIR_DROP: - /* drop the packet after some time */ - FREE_PKT(m); - break; - - default: - printf("dummynet: bad switch %d!\n", dst); - FREE_PKT(m); - break; - } - } -} - -static inline int -tag_mbuf(struct mbuf *m, int dir, struct ip_fw_args *fwa) -{ - struct dn_pkt_tag *dt; - struct m_tag *mtag; - - mtag = m_tag_get(PACKET_TAG_DUMMYNET, - sizeof(*dt), M_NOWAIT | M_ZERO); - if (mtag == NULL) - return 1; /* Cannot allocate packet header. */ - m_tag_prepend(m, mtag); /* Attach to mbuf chain. */ - dt = (struct dn_pkt_tag *)(mtag + 1); - dt->rule = fwa->rule; - dt->rule.info &= IPFW_ONEPASS; /* only keep this info */ - dt->dn_dir = dir; - dt->ifp = fwa->oif; - /* dt->output tame is updated as we move through */ - dt->output_time = dn_cfg.curr_time; - return 0; -} - - -/* - * dummynet hook for packets. - * We use the argument to locate the flowset fs and the sched_set sch - * associated to it. The we apply flow_mask and sched_mask to - * determine the queue and scheduler instances. - * - * dir where shall we send the packet after dummynet. - * *m0 the mbuf with the packet - * ifp the 'ifp' parameter from the caller. - * NULL in ip_input, destination interface in ip_output, - */ -int -dummynet_io(struct mbuf **m0, int dir, struct ip_fw_args *fwa) -{ - struct mbuf *m = *m0; - struct dn_fsk *fs = NULL; - struct dn_sch_inst *si; - struct dn_queue *q = NULL; /* default */ - - int fs_id = (fwa->rule.info & IPFW_INFO_MASK) + - ((fwa->rule.info & IPFW_IS_PIPE) ? 2*DN_MAX_ID : 0); - DN_BH_WLOCK(); - io_pkt++; - /* we could actually tag outside the lock, but who cares... */ - if (tag_mbuf(m, dir, fwa)) - goto dropit; - if (dn_cfg.busy) { - /* if the upper half is busy doing something expensive, - * lets queue the packet and move forward - */ - mq_append(&dn_cfg.pending, m); - m = *m0 = NULL; /* consumed */ - goto done; /* already active, nothing to do */ - } - /* XXX locate_flowset could be optimised with a direct ref. */ - fs = dn_ht_find(dn_cfg.fshash, fs_id, 0, NULL); - if (fs == NULL) - goto dropit; /* This queue/pipe does not exist! */ - if (fs->sched == NULL) /* should not happen */ - goto dropit; - /* find scheduler instance, possibly applying sched_mask */ - si = ipdn_si_find(fs->sched, &(fwa->f_id)); - if (si == NULL) - goto dropit; - /* - * If the scheduler supports multiple queues, find the right one - * (otherwise it will be ignored by enqueue). - */ - if (fs->sched->fp->flags & DN_MULTIQUEUE) { - q = ipdn_q_find(fs, si, &(fwa->f_id)); - if (q == NULL) - goto dropit; - } - if (fs->sched->fp->enqueue(si, q, m)) { - /* packet was dropped by enqueue() */ - m = *m0 = NULL; - goto dropit; - } - - if (si->kflags & DN_ACTIVE) { - m = *m0 = NULL; /* consumed */ - goto done; /* already active, nothing to do */ - } - - /* compute the initial allowance */ - if (si->idle_time < dn_cfg.curr_time) { - /* Do this only on the first packet on an idle pipe */ - struct dn_link *p = &fs->sched->link; - - si->sched_time = dn_cfg.curr_time; - si->credit = dn_cfg.io_fast ? p->bandwidth : 0; - if (p->burst) { - uint64_t burst = (dn_cfg.curr_time - si->idle_time) * p->bandwidth; - if (burst > p->burst) - burst = p->burst; - si->credit += burst; - } - } - /* pass through scheduler and delay line */ - m = serve_sched(NULL, si, dn_cfg.curr_time); - - /* optimization -- pass it back to ipfw for immediate send */ - /* XXX Don't call dummynet_send() if scheduler return the packet - * just enqueued. This avoid a lock order reversal. - * - */ - if (/*dn_cfg.io_fast &&*/ m == *m0 && (dir & PROTO_LAYER2) == 0 ) { - /* fast io, rename the tag * to carry reinject info. */ - struct m_tag *tag = m_tag_first(m); - - tag->m_tag_cookie = MTAG_IPFW_RULE; - tag->m_tag_id = 0; - io_pkt_fast++; - if (m->m_nextpkt != NULL) { - printf("dummynet: fast io: pkt chain detected!\n"); - m->m_nextpkt = NULL; - } - m = NULL; - } else { - *m0 = NULL; - } -done: - DN_BH_WUNLOCK(); - if (m) - dummynet_send(m); - return 0; - -dropit: - io_pkt_drop++; - DN_BH_WUNLOCK(); - if (m) - FREE_PKT(m); - *m0 = NULL; - return (fs && (fs->fs.flags & DN_NOERROR)) ? 0 : ENOBUFS; -} |