/* * Copyright (c) 1998-2001 Luigi Rizzo, Universita` di Pisa * Portions Copyright (c) 2000 Akamba Corp. * 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. * * $FreeBSD$ */ #define DEB(x) #define DDB(x) x /* * This module implements IP dummynet, a bandwidth limiter/delay emulator * used in conjunction with the ipfw package. * Description of the data structures used is in ip_dummynet.h * Here you mainly find the following blocks of code: * + variable declarations; * + heap management functions; * + scheduler and dummynet functions; * + configuration and initialization. * * NOTA BENE: critical sections are protected by splimp()/splx() * pairs. One would think that splnet() is enough as for most of * the netinet code, but it is not so because when used with * bridging, dummynet is invoked at splimp(). * * Most important Changes: * * 010124: Fixed WF2Q behaviour * 010122: Fixed spl protection. * 000601: WF2Q support * 000106: large rewrite, use heaps to handle very many pipes. * 980513: initial release * * include files marked with XXX are probably not needed */ #include #include #include #include #include /* XXX */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "opt_bdg.h" #ifdef BRIDGE #include /* for struct arpcom */ #include #endif /* * We keep a private variable for the simulation time, but we could * probably use an existing one ("softticks" in sys/kern/kern_timer.c) */ static dn_key curr_time = 0 ; /* current simulation time */ static int dn_hash_size = 64 ; /* default hash size */ /* statistics on number of queue searches and search steps */ static int searches, search_steps ; static int pipe_expire = 1 ; /* expire queue if empty */ static int dn_max_ratio = 16 ; /* max queues/buckets ratio */ static int red_lookup_depth = 256; /* RED - default lookup table depth */ static int red_avg_pkt_size = 512; /* RED - default medium packet size */ static int red_max_pkt_size = 1500; /* RED - default max packet size */ /* * Three heaps contain queues and pipes that the scheduler handles: * * ready_heap contains all dn_flow_queue related to fixed-rate pipes. * * wfq_ready_heap contains the pipes associated with WF2Q flows * * extract_heap contains pipes associated with delay lines. * */ static struct dn_heap ready_heap, extract_heap, wfq_ready_heap ; static int heap_init(struct dn_heap *h, int size) ; static int heap_insert (struct dn_heap *h, dn_key key1, void *p); static void heap_extract(struct dn_heap *h, void *obj); static void transmit_event(struct dn_pipe *pipe); static void ready_event(struct dn_flow_queue *q); static struct dn_pipe *all_pipes = NULL ; /* list of all pipes */ static struct dn_flow_set *all_flow_sets = NULL ;/* list of all flow_sets */ #ifdef SYSCTL_NODE SYSCTL_NODE(_net_inet_ip, OID_AUTO, dummynet, CTLFLAG_RW, 0, "Dummynet"); SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, hash_size, CTLFLAG_RW, &dn_hash_size, 0, "Default hash table size"); SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, curr_time, CTLFLAG_RD, &curr_time, 0, "Current tick"); SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, ready_heap, CTLFLAG_RD, &ready_heap.size, 0, "Size of ready heap"); SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, extract_heap, CTLFLAG_RD, &extract_heap.size, 0, "Size of extract heap"); SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, searches, CTLFLAG_RD, &searches, 0, "Number of queue searches"); SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, search_steps, CTLFLAG_RD, &search_steps, 0, "Number of queue search steps"); SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, expire, CTLFLAG_RW, &pipe_expire, 0, "Expire queue if empty"); SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, max_chain_len, CTLFLAG_RW, &dn_max_ratio, 0, "Max ratio between dynamic queues and buckets"); SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, red_lookup_depth, CTLFLAG_RD, &red_lookup_depth, 0, "Depth of RED lookup table"); SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, red_avg_pkt_size, CTLFLAG_RD, &red_avg_pkt_size, 0, "RED Medium packet size"); SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, red_max_pkt_size, CTLFLAG_RD, &red_max_pkt_size, 0, "RED Max packet size"); #endif static int config_pipe(struct dn_pipe *p); static int ip_dn_ctl(struct sockopt *sopt); static void rt_unref(struct rtentry *); static void dummynet(void *); static void dummynet_flush(void); void dummynet_drain(void); int if_tx_rdy(struct ifnet *ifp); /* * ip_fw_chain_head is used when deleting a pipe, because ipfw rules can * hold references to the pipe. */ extern LIST_HEAD (ip_fw_head, ip_fw) ip_fw_chain_head; static void rt_unref(struct rtentry *rt) { if (rt == NULL) return ; if (rt->rt_refcnt <= 0) printf("-- warning, refcnt now %ld, decreasing\n", rt->rt_refcnt); RTFREE(rt); } /* * Heap management functions. * * In the heap, first node is element 0. Children of i are 2i+1 and 2i+2. * Some macros help finding parent/children so we can optimize them. * * heap_init() is called to expand the heap when needed. * Increment size in blocks of 16 entries. * XXX failure to allocate a new element is a pretty bad failure * as we basically stall a whole queue forever!! * Returns 1 on error, 0 on success */ #define HEAP_FATHER(x) ( ( (x) - 1 ) / 2 ) #define HEAP_LEFT(x) ( 2*(x) + 1 ) #define HEAP_IS_LEFT(x) ( (x) & 1 ) #define HEAP_RIGHT(x) ( 2*(x) + 2 ) #define HEAP_SWAP(a, b, buffer) { buffer = a ; a = b ; b = buffer ; } #define HEAP_INCREMENT 15 static int heap_init(struct dn_heap *h, int new_size) { struct dn_heap_entry *p; if (h->size >= new_size ) { printf("heap_init, Bogus call, have %d want %d\n", h->size, new_size); return 0 ; } new_size = (new_size + HEAP_INCREMENT ) & ~HEAP_INCREMENT ; p = malloc(new_size * sizeof(*p), M_IPFW, M_DONTWAIT ); if (p == NULL) { printf(" heap_init, resize %d failed\n", new_size ); return 1 ; /* error */ } if (h->size > 0) { bcopy(h->p, p, h->size * sizeof(*p) ); free(h->p, M_IPFW); } h->p = p ; h->size = new_size ; return 0 ; } /* * Insert element in heap. Normally, p != NULL, we insert p in * a new position and bubble up. If p == NULL, then the element is * already in place, and key is the position where to start the * bubble-up. * Returns 1 on failure (cannot allocate new heap entry) * * If offset > 0 the position (index, int) of the element in the heap is * also stored in the element itself at the given offset in bytes. */ #define SET_OFFSET(heap, node) \ if (heap->offset > 0) \ *((int *)((char *)(heap->p[node].object) + heap->offset)) = node ; /* * RESET_OFFSET is used for sanity checks. It sets offset to an invalid value. */ #define RESET_OFFSET(heap, node) \ if (heap->offset > 0) \ *((int *)((char *)(heap->p[node].object) + heap->offset)) = -1 ; static int heap_insert(struct dn_heap *h, dn_key key1, void *p) { int son = h->elements ; if (p == NULL) /* data already there, set starting point */ son = key1 ; else { /* insert new element at the end, possibly resize */ son = h->elements ; if (son == h->size) /* need resize... */ if (heap_init(h, h->elements+1) ) return 1 ; /* failure... */ h->p[son].object = p ; h->p[son].key = key1 ; h->elements++ ; } while (son > 0) { /* bubble up */ int father = HEAP_FATHER(son) ; struct dn_heap_entry tmp ; if (DN_KEY_LT( h->p[father].key, h->p[son].key ) ) break ; /* found right position */ /* son smaller than father, swap and repeat */ HEAP_SWAP(h->p[son], h->p[father], tmp) ; SET_OFFSET(h, son); son = father ; } SET_OFFSET(h, son); return 0 ; } /* * remove top element from heap, or obj if obj != NULL */ static void heap_extract(struct dn_heap *h, void *obj) { int child, father, max = h->elements - 1 ; if (max < 0) { printf("warning, extract from empty heap 0x%p\n", h); return ; } father = 0 ; /* default: move up smallest child */ if (obj != NULL) { /* extract specific element, index is at offset */ if (h->offset <= 0) panic("*** heap_extract from middle not supported on this heap!!!\n"); father = *((int *)((char *)obj + h->offset)) ; if (father < 0 || father >= h->elements) { printf("dummynet: heap_extract, father %d out of bound 0..%d\n", father, h->elements); panic("heap_extract"); } } RESET_OFFSET(h, father); child = HEAP_LEFT(father) ; /* left child */ while (child <= max) { /* valid entry */ if (child != max && DN_KEY_LT(h->p[child+1].key, h->p[child].key) ) child = child+1 ; /* take right child, otherwise left */ h->p[father] = h->p[child] ; SET_OFFSET(h, father); father = child ; child = HEAP_LEFT(child) ; /* left child for next loop */ } h->elements-- ; if (father != max) { /* * Fill hole with last entry and bubble up, reusing the insert code */ h->p[father] = h->p[max] ; heap_insert(h, father, NULL); /* this one cannot fail */ } } #if 0 /* * change object position and update references * XXX this one is never used! */ static void heap_move(struct dn_heap *h, dn_key new_key, void *object) { int temp; int i ; int max = h->elements-1 ; struct dn_heap_entry buf ; if (h->offset <= 0) panic("cannot move items on this heap"); i = *((int *)((char *)object + h->offset)); if (DN_KEY_LT(new_key, h->p[i].key) ) { /* must move up */ h->p[i].key = new_key ; for (; i>0 && DN_KEY_LT(new_key, h->p[(temp = HEAP_FATHER(i))].key) ; i = temp ) { /* bubble up */ HEAP_SWAP(h->p[i], h->p[temp], buf) ; SET_OFFSET(h, i); } } else { /* must move down */ h->p[i].key = new_key ; while ( (temp = HEAP_LEFT(i)) <= max ) { /* found left child */ if ((temp != max) && DN_KEY_GT(h->p[temp].key, h->p[temp+1].key)) temp++ ; /* select child with min key */ if (DN_KEY_GT(new_key, h->p[temp].key)) { /* go down */ HEAP_SWAP(h->p[i], h->p[temp], buf) ; SET_OFFSET(h, i); } else break ; i = temp ; } } SET_OFFSET(h, i); } #endif /* heap_move, unused */ /* * heapify() will reorganize data inside an array to maintain the * heap property. It is needed when we delete a bunch of entries. */ static void heapify(struct dn_heap *h) { int i ; for (i = 0 ; i < h->elements ; i++ ) heap_insert(h, i , NULL) ; } /* * cleanup the heap and free data structure */ static void heap_free(struct dn_heap *h) { if (h->size >0 ) free(h->p, M_IPFW); bzero(h, sizeof(*h) ); } /* * --- end of heap management functions --- */ /* * Scheduler functions: * * transmit_event() is called when the delay-line needs to enter * the scheduler, either because of existing pkts getting ready, * or new packets entering the queue. The event handled is the delivery * time of the packet. * * ready_event() does something similar with fixed-rate queues, and the * event handled is the finish time of the head pkt. * * wfq_ready_event() does something similar with WF2Q queues, and the * event handled is the start time of the head pkt. * * In all cases, we make sure that the data structures are consistent * before passing pkts out, because this might trigger recursive * invocations of the procedures. */ static void transmit_event(struct dn_pipe *pipe) { struct dn_pkt *pkt ; while ( (pkt = pipe->head) && DN_KEY_LEQ(pkt->output_time, curr_time) ) { /* * first unlink, then call procedures, since ip_input() can invoke * ip_output() and viceversa, thus causing nested calls */ pipe->head = DN_NEXT(pkt) ; /* * The actual mbuf is preceded by a struct dn_pkt, resembling an mbuf * (NOT A REAL one, just a small block of malloc'ed memory) with * m_type = MT_DUMMYNET * m_next = actual mbuf to be processed by ip_input/output * m_data = the matching rule * and some other fields. * The block IS FREED HERE because it contains parameters passed * to the called routine. */ switch (pkt->dn_dir) { case DN_TO_IP_OUT: (void)ip_output((struct mbuf *)pkt, NULL, NULL, 0, NULL); rt_unref (pkt->ro.ro_rt) ; break ; case DN_TO_IP_IN : ip_input((struct mbuf *)pkt) ; break ; #ifdef BRIDGE case DN_TO_BDG_FWD : { struct mbuf *m = (struct mbuf *)pkt; struct ether_header *eh; if (pkt->dn_m->m_len < ETHER_HDR_LEN && (pkt->dn_m = m_pullup(pkt->dn_m, ETHER_HDR_LEN)) == NULL) { printf("dummynet/bridge: pullup fail, dropping pkt\n"); break; } /* * same as ether_input, make eh be a pointer into the mbuf */ eh = mtod(pkt->dn_m, struct ether_header *); m_adj(pkt->dn_m, ETHER_HDR_LEN); /* * bdg_forward() wants a pointer to the pseudo-mbuf-header, but * on return it will supply the pointer to the actual packet * (originally pkt->dn_m, but could be something else now) if * it has not consumed it. */ m = bdg_forward(m, eh, pkt->ifp); if (m) m_freem(m); } break ; #endif default: printf("dummynet: bad switch %d!\n", pkt->dn_dir); m_freem(pkt->dn_m); break ; } FREE(pkt, M_IPFW); } /* if there are leftover packets, put into the heap for next event */ if ( (pkt = pipe->head) ) heap_insert(&extract_heap, pkt->output_time, pipe ) ; /* XXX should check errors on heap_insert, by draining the * whole pipe p and hoping in the future we are more successful */ } /* * the following macro computes how many ticks we have to wait * before being able to transmit a packet. The credit is taken from * either a pipe (WF2Q) or a flow_queue (per-flow queueing) */ #define SET_TICKS(pkt, q, p) \ (pkt->dn_m->m_pkthdr.len*8*hz - (q)->numbytes + p->bandwidth - 1 ) / \ p->bandwidth ; /* * extract pkt from queue, compute output time (could be now) * and put into delay line (p_queue) */ static void move_pkt(struct dn_pkt *pkt, struct dn_flow_queue *q, struct dn_pipe *p, int len) { q->head = DN_NEXT(pkt) ; q->len-- ; q->len_bytes -= len ; pkt->output_time = curr_time + p->delay ; if (p->head == NULL) p->head = pkt; else DN_NEXT(p->tail) = pkt; p->tail = pkt; DN_NEXT(p->tail) = NULL; } /* * ready_event() is invoked every time the queue must enter the * scheduler, either because the first packet arrives, or because * a previously scheduled event fired. * On invokation, drain as many pkts as possible (could be 0) and then * if there are leftover packets reinsert the pkt in the scheduler. */ static void ready_event(struct dn_flow_queue *q) { struct dn_pkt *pkt; struct dn_pipe *p = q->fs->pipe ; int p_was_empty ; if (p == NULL) { printf("ready_event- pipe is gone\n"); return ; } p_was_empty = (p->head == NULL) ; /* * schedule fixed-rate queues linked to this pipe: * Account for the bw accumulated since last scheduling, then * drain as many pkts as allowed by q->numbytes and move to * the delay line (in p) computing output time. * bandwidth==0 (no limit) means we can drain the whole queue, * setting len_scaled = 0 does the job. */ q->numbytes += ( curr_time - q->sched_time ) * p->bandwidth; while ( (pkt = q->head) != NULL ) { int len = pkt->dn_m->m_pkthdr.len; int len_scaled = p->bandwidth ? len*8*hz : 0 ; if (len_scaled > q->numbytes ) break ; q->numbytes -= len_scaled ; move_pkt(pkt, q, p, len); } /* * If we have more packets queued, schedule next ready event * (can only occur when bandwidth != 0, otherwise we would have * flushed the whole queue in the previous loop). * To this purpose we record the current time and compute how many * ticks to go for the finish time of the packet. */ if ( (pkt = q->head) != NULL ) { /* this implies bandwidth != 0 */ dn_key t = SET_TICKS(pkt, q, p); /* ticks i have to wait */ q->sched_time = curr_time ; heap_insert(&ready_heap, curr_time + t, (void *)q ); /* XXX should check errors on heap_insert, and drain the whole * queue on error hoping next time we are luckier. */ } else /* RED needs to know when the queue becomes empty */ q->q_time = curr_time; /* * If the delay line was empty call transmit_event(p) now. * Otherwise, the scheduler will take care of it. */ if (p_was_empty) transmit_event(p); } /* * Called when we can transmit packets on WF2Q queues. Take pkts out of * the queues at their start time, and enqueue into the delay line. * Packets are drained until p->numbytes < 0. As long as * len_scaled >= p->numbytes, the packet goes into the delay line * with a deadline p->delay. For the last packet, if p->numbytes<0, * there is an additional delay. */ static void ready_event_wfq(struct dn_pipe *p) { int p_was_empty = (p->head == NULL) ; struct dn_heap *sch = &(p->scheduler_heap); struct dn_heap *neh = &(p->not_eligible_heap) ; if (p->if_name[0] == 0) /* tx clock is simulated */ p->numbytes += ( curr_time - p->sched_time ) * p->bandwidth; else { /* tx clock is for real, the ifq must be empty or this is a NOP */ if (p->ifp && p->ifp->if_snd.ifq_head != NULL) return ; else { DEB(printf("pipe %d ready from %s --\n", p->pipe_nr, p->if_name);) } } /* * While we have backlogged traffic AND credit, we need to do * something on the queue. */ while ( p->numbytes >=0 && (sch->elements>0 || neh->elements >0) ) { if (sch->elements > 0) { /* have some eligible pkts to send out */ struct dn_flow_queue *q = sch->p[0].object ; struct dn_pkt *pkt = q->head; struct dn_flow_set *fs = q->fs; u_int64_t len = pkt->dn_m->m_pkthdr.len; int len_scaled = p->bandwidth ? len*8*hz : 0 ; heap_extract(sch, NULL); /* remove queue from heap */ p->numbytes -= len_scaled ; move_pkt(pkt, q, p, len); p->V += (len<sum ; /* update V */ q->S = q->F ; /* update start time */ if (q->len == 0) { /* Flow not backlogged any more */ fs->backlogged-- ; heap_insert(&(p->idle_heap), q->F, q); } else { /* still backlogged */ /* * update F and position in backlogged queue, then * put flow in not_eligible_heap (we will fix this later). */ len = (q->head)->dn_m->m_pkthdr.len; q->F += (len<weight ; if (DN_KEY_LEQ(q->S, p->V)) heap_insert(neh, q->S, q); else heap_insert(sch, q->F, q); } } /* * now compute V = max(V, min(S_i)). Remember that all elements in sch * have by definition S_i <= V so if sch is not empty, V is surely * the max and we must not update it. Conversely, if sch is empty * we only need to look at neh. */ if (sch->elements == 0 && neh->elements > 0) p->V = MAX64 ( p->V, neh->p[0].key ); /* move from neh to sch any packets that have become eligible */ while (neh->elements > 0 && DN_KEY_LEQ(neh->p[0].key, p->V) ) { struct dn_flow_queue *q = neh->p[0].object ; heap_extract(neh, NULL); heap_insert(sch, q->F, q); } if (p->if_name[0] != '\0') {/* tx clock is from a real thing */ p->numbytes = -1 ; /* mark not ready for I/O */ break ; } } if (sch->elements == 0 && neh->elements == 0 && p->numbytes >= 0 && p->idle_heap.elements > 0) { /* * no traffic and no events scheduled. We can get rid of idle-heap. */ int i ; for (i = 0 ; i < p->idle_heap.elements ; i++) { struct dn_flow_queue *q = p->idle_heap.p[i].object ; q->F = 0 ; q->S = q->F + 1 ; } p->sum = 0 ; p->V = 0 ; p->idle_heap.elements = 0 ; } /* * If we are getting clocks from dummynet (not a real interface) and * If we are under credit, schedule the next ready event. * Also fix the delivery time of the last packet. */ if (p->if_name[0]==0 && p->numbytes < 0) { /* this implies bandwidth >0 */ dn_key t=0 ; /* number of ticks i have to wait */ if (p->bandwidth > 0) t = ( p->bandwidth -1 - p->numbytes) / p->bandwidth ; p->tail->output_time += t ; p->sched_time = curr_time ; heap_insert(&wfq_ready_heap, curr_time + t, (void *)p); /* XXX should check errors on heap_insert, and drain the whole * queue on error hoping next time we are luckier. */ } /* * If the delay line was empty call transmit_event(p) now. * Otherwise, the scheduler will take care of it. */ if (p_was_empty) transmit_event(p); } /* * This is called once per tick, or HZ times per second. It is used to * increment the current tick counter and schedule expired events. */ static void dummynet(void * __unused unused) { void *p ; /* generic parameter to handler */ struct dn_heap *h ; int s ; struct dn_heap *heaps[3]; int i; struct dn_pipe *pe ; heaps[0] = &ready_heap ; /* fixed-rate queues */ heaps[1] = &wfq_ready_heap ; /* wfq queues */ heaps[2] = &extract_heap ; /* delay line */ s = splimp(); /* see note on top, splnet() is not enough */ curr_time++ ; for (i=0; i < 3 ; i++) { h = heaps[i]; while (h->elements > 0 && DN_KEY_LEQ(h->p[0].key, curr_time) ) { DDB(if (h->p[0].key > curr_time) printf("-- dummynet: warning, heap %d is %d ticks late\n", i, (int)(curr_time - h->p[0].key));) p = h->p[0].object ; /* store a copy before heap_extract */ heap_extract(h, NULL); /* need to extract before processing */ if (i == 0) ready_event(p) ; else if (i == 1) { struct dn_pipe *pipe = p; if (pipe->if_name[0] != '\0') printf("*** bad ready_event_wfq for pipe %s\n", pipe->if_name); else ready_event_wfq(p) ; } else transmit_event(p); } } /* sweep pipes trying to expire idle flow_queues */ for (pe = all_pipes; pe ; pe = pe->next ) if (pe->idle_heap.elements > 0 && DN_KEY_LT(pe->idle_heap.p[0].key, pe->V) ) { struct dn_flow_queue *q = pe->idle_heap.p[0].object ; heap_extract(&(pe->idle_heap), NULL); q->S = q->F + 1 ; /* mark timestamp as invalid */ pe->sum -= q->fs->weight ; } splx(s); timeout(dummynet, NULL, 1); } /* * called by an interface when tx_rdy occurs. */ int if_tx_rdy(struct ifnet *ifp) { struct dn_pipe *p; for (p = all_pipes; p ; p = p->next ) if (p->ifp == ifp) break ; if (p == NULL) { char buf[32]; sprintf(buf, "%s%d",ifp->if_name, ifp->if_unit); for (p = all_pipes; p ; p = p->next ) if (!strcmp(p->if_name, buf) ) { p->ifp = ifp ; DEB(printf("++ tx rdy from %s (now found)\n", buf);) break ; } } if (p != NULL) { DEB(printf("++ tx rdy from %s%d - qlen %d\n", ifp->if_name, ifp->if_unit, ifp->if_snd.ifq_len);) p->numbytes = 0 ; /* mark ready for I/O */ ready_event_wfq(p); } return 0; } /* * Unconditionally expire empty queues in case of shortage. * Returns the number of queues freed. */ static int expire_queues(struct dn_flow_set *fs) { struct dn_flow_queue *q, *prev ; int i, initial_elements = fs->rq_elements ; if (fs->last_expired == time_second) return 0 ; fs->last_expired = time_second ; for (i = 0 ; i <= fs->rq_size ; i++) /* last one is overflow */ for (prev=NULL, q = fs->rq[i] ; q != NULL ; ) if (q->head != NULL || q->S != q->F+1) { prev = q ; q = q->next ; } else { /* entry is idle, expire it */ struct dn_flow_queue *old_q = q ; if (prev != NULL) prev->next = q = q->next ; else fs->rq[i] = q = q->next ; fs->rq_elements-- ; free(old_q, M_IPFW); } return initial_elements - fs->rq_elements ; } /* * If room, create a new queue and put at head of slot i; * otherwise, create or use the default queue. */ static struct dn_flow_queue * create_queue(struct dn_flow_set *fs, int i) { struct dn_flow_queue *q ; if (fs->rq_elements > fs->rq_size * dn_max_ratio && expire_queues(fs) == 0) { /* * No way to get room, use or create overflow queue. */ i = fs->rq_size ; if ( fs->rq[i] != NULL ) return fs->rq[i] ; } q = malloc(sizeof(*q), M_IPFW, M_DONTWAIT | M_ZERO); /* M_ZERO needed */ if (q == NULL) { printf("sorry, cannot allocate queue for new flow\n"); return NULL ; } q->fs = fs ; q->hash_slot = i ; q->next = fs->rq[i] ; q->S = q->F + 1; /* hack - mark timestamp as invalid */ fs->rq[i] = q ; fs->rq_elements++ ; return q ; } /* * Given a flow_set and a pkt in last_pkt, find a matching queue * after appropriate masking. The queue is moved to front * so that further searches take less time. */ static struct dn_flow_queue * find_queue(struct dn_flow_set *fs) { int i = 0 ; /* we need i and q for new allocations */ struct dn_flow_queue *q, *prev; if ( !(fs->flags_fs & DN_HAVE_FLOW_MASK) ) q = fs->rq[0] ; else { /* first, do the masking */ last_pkt.dst_ip &= fs->flow_mask.dst_ip ; last_pkt.src_ip &= fs->flow_mask.src_ip ; last_pkt.dst_port &= fs->flow_mask.dst_port ; last_pkt.src_port &= fs->flow_mask.src_port ; last_pkt.proto &= fs->flow_mask.proto ; last_pkt.flags = 0 ; /* we don't care about this one */ /* then, hash function */ i = ( (last_pkt.dst_ip) & 0xffff ) ^ ( (last_pkt.dst_ip >> 15) & 0xffff ) ^ ( (last_pkt.src_ip << 1) & 0xffff ) ^ ( (last_pkt.src_ip >> 16 ) & 0xffff ) ^ (last_pkt.dst_port << 1) ^ (last_pkt.src_port) ^ (last_pkt.proto ); i = i % fs->rq_size ; /* finally, scan the current list for a match */ searches++ ; for (prev=NULL, q = fs->rq[i] ; q ; ) { search_steps++; if (bcmp(&last_pkt, &(q->id), sizeof(q->id) ) == 0) break ; /* found */ else if (pipe_expire && q->head == NULL && q->S == q->F+1 ) { /* entry is idle and not in any heap, expire it */ struct dn_flow_queue *old_q = q ; if (prev != NULL) prev->next = q = q->next ; else fs->rq[i] = q = q->next ; fs->rq_elements-- ; free(old_q, M_IPFW); continue ; } prev = q ; q = q->next ; } if (q && prev != NULL) { /* found and not in front */ prev->next = q->next ; q->next = fs->rq[i] ; fs->rq[i] = q ; } } if (q == NULL) { /* no match, need to allocate a new entry */ q = create_queue(fs, i); if (q != NULL) q->id = last_pkt ; } return q ; } static int red_drops(struct dn_flow_set *fs, struct dn_flow_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. * */ int64_t p_b = 0; /* queue in bytes or packets ? */ u_int q_size = (fs->flags_fs & DN_QSIZE_IS_BYTES) ? q->len_bytes : q->len; DEB(printf("\n%d q: %2u ", (int) curr_time, q_size);) /* 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 = (curr_time - q->q_time) / fs->lookup_step; q->avg = (t < fs->lookup_depth) ? SCALE_MUL(q->avg, fs->w_q_lookup[t]) : 0; } } DEB(printf("avg: %u ", SCALE_VAL(q->avg));) /* 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->flags_fs & 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, and 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; printf("- drop"); 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), and 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->flags_fs & DN_QSIZE_IS_BYTES) p_b = (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; DEB(printf("- red drop");) /* after a drop we calculate a new random value */ q->random = random() & 0xffff; return 1; /* drop */ } } /* end of RED algorithm */ return 0 ; /* accept */ } static __inline struct dn_flow_set * locate_flowset(int pipe_nr, struct ip_fw *rule) { struct dn_flow_set *fs = NULL ; if ( (rule->fw_flg & IP_FW_F_COMMAND) == IP_FW_F_QUEUE ) for (fs=all_flow_sets; fs && fs->fs_nr != pipe_nr; fs=fs->next) ; else { struct dn_pipe *p1; for (p1 = all_pipes; p1 && p1->pipe_nr != pipe_nr; p1 = p1->next) ; if (p1 != NULL) fs = &(p1->fs) ; } if (fs != NULL) rule->pipe_ptr = fs ; /* record for the future */ return fs ; } /* * dummynet hook for packets. Below 'pipe' is a pipe or a queue * depending on whether WF2Q or fixed bw is used. */ int dummynet_io(int pipe_nr, int dir, /* pipe_nr can also be a fs_nr */ struct mbuf *m, struct ifnet *ifp, struct route *ro, struct sockaddr_in *dst, struct ip_fw *rule, int flags) { struct dn_pkt *pkt; struct dn_flow_set *fs; struct dn_pipe *pipe ; u_int64_t len = m->m_pkthdr.len ; struct dn_flow_queue *q = NULL ; int s ; s = splimp(); pipe_nr &= 0xffff ; if ( (fs = rule->pipe_ptr) == NULL ) { fs = locate_flowset(pipe_nr, rule); if (fs == NULL) goto dropit ; /* this queue/pipe does not exist! */ } pipe = fs->pipe ; if (pipe == NULL) { /* must be a queue, try find a matching pipe */ for (pipe = all_pipes; pipe && pipe->pipe_nr != fs->parent_nr; pipe = pipe->next) ; if (pipe != NULL) fs->pipe = pipe ; else { printf("No pipe %d for queue %d, drop pkt\n", fs->parent_nr, fs->fs_nr); goto dropit ; } } q = find_queue(fs); if ( q == NULL ) goto dropit ; /* cannot allocate queue */ /* * update statistics, then check reasons to drop pkt */ q->tot_bytes += len ; q->tot_pkts++ ; if ( fs->plr && random() < fs->plr ) goto dropit ; /* random pkt drop */ if ( fs->flags_fs & DN_QSIZE_IS_BYTES) { if (q->len_bytes > fs->qsize) goto dropit ; /* queue size overflow */ } else { if (q->len >= fs->qsize) goto dropit ; /* queue count overflow */ } if ( fs->flags_fs & DN_IS_RED && red_drops(fs, q, len) ) goto dropit ; /* XXX expensive to zero, see if we can remove it*/ pkt = (struct dn_pkt *)malloc(sizeof (*pkt), M_IPFW, M_NOWAIT | M_ZERO); if ( pkt == NULL ) goto dropit ; /* cannot allocate packet header */ /* ok, i can handle the pkt now... */ /* build and enqueue packet + parameters */ pkt->hdr.mh_type = MT_DUMMYNET ; (struct ip_fw *)pkt->hdr.mh_data = rule ; DN_NEXT(pkt) = NULL; pkt->dn_m = m; pkt->dn_dir = dir ; pkt->ifp = ifp; if (dir == DN_TO_IP_OUT) { /* * We need to copy *ro because for ICMP pkts (and maybe others) * the caller passed a pointer into the stack; dst might also be * a pointer into *ro so it needs to be updated. */ pkt->ro = *ro; if (ro->ro_rt) ro->ro_rt->rt_refcnt++ ; if (dst == (struct sockaddr_in *)&ro->ro_dst) /* dst points into ro */ dst = (struct sockaddr_in *)&(pkt->ro.ro_dst) ; pkt->dn_dst = dst; pkt->flags = flags ; } if (q->head == NULL) q->head = pkt; else DN_NEXT(q->tail) = pkt; q->tail = pkt; q->len++; q->len_bytes += len ; if ( q->head != pkt ) /* flow was not idle, we are done */ goto done; /* * If we reach this point the flow was previously idle, so we need * to schedule it. This involves different actions for fixed-rate or * WF2Q queues. */ if ( (rule->fw_flg & IP_FW_F_COMMAND) == IP_FW_F_PIPE ) { /* * Fixed-rate queue: just insert into the ready_heap. */ dn_key t = 0 ; if (pipe->bandwidth) t = SET_TICKS(pkt, q, pipe); q->sched_time = curr_time ; if (t == 0) /* must process it now */ ready_event( q ); else heap_insert(&ready_heap, curr_time + t , q ); } else { /* * WF2Q. First, compute start time S: if the flow was idle (S=F+1) * set S to the virtual time V for the controlling pipe, and update * the sum of weights for the pipe; otherwise, remove flow from * idle_heap and set S to max(F,V). * Second, compute finish time F = S + len/weight. * Third, if pipe was idle, update V=max(S, V). * Fourth, count one more backlogged flow. */ if (DN_KEY_GT(q->S, q->F)) { /* means timestamps are invalid */ q->S = pipe->V ; pipe->sum += fs->weight ; /* add weight of new queue */ } else { heap_extract(&(pipe->idle_heap), q); q->S = MAX64(q->F, pipe->V ) ; } q->F = q->S + ( len<weight; if (pipe->not_eligible_heap.elements == 0 && pipe->scheduler_heap.elements == 0) pipe->V = MAX64 ( q->S, pipe->V ); fs->backlogged++ ; /* * Look at eligibility. A flow is not eligibile if S>V (when * this happens, it means that there is some other flow already * scheduled for the same pipe, so the scheduler_heap cannot be * empty). If the flow is not eligible we just store it in the * not_eligible_heap. Otherwise, we store in the scheduler_heap * and possibly invoke ready_event_wfq() right now if there is * leftover credit. * Note that for all flows in scheduler_heap (SCH), S_i <= V, * and for all flows in not_eligible_heap (NEH), S_i > V . * So when we need to compute max( V, min(S_i) ) forall i in SCH+NEH, * we only need to look into NEH. */ if (DN_KEY_GT(q->S, pipe->V) ) { /* not eligible */ if (pipe->scheduler_heap.elements == 0) printf("++ ouch! not eligible but empty scheduler!\n"); heap_insert(&(pipe->not_eligible_heap), q->S, q); } else { heap_insert(&(pipe->scheduler_heap), q->F, q); if (pipe->numbytes >= 0) { /* pipe is idle */ if (pipe->scheduler_heap.elements != 1) printf("*** OUCH! pipe should have been idle!\n"); DEB(printf("Waking up pipe %d at %d\n", pipe->pipe_nr, (int)(q->F >> MY_M)); ) pipe->sched_time = curr_time ; ready_event_wfq(pipe); } } } done: splx(s); return 0; dropit: splx(s); if (q) q->drops++ ; m_freem(m); return ENOBUFS ; } /* * Below, the rt_unref is only needed when (pkt->dn_dir == DN_TO_IP_OUT) * Doing this would probably save us the initial bzero of dn_pkt */ #define DN_FREE_PKT(pkt) { \ struct dn_pkt *n = pkt ; \ rt_unref ( n->ro.ro_rt ) ; \ m_freem(n->dn_m); \ pkt = DN_NEXT(n) ; \ free(n, M_IPFW) ; } /* * Dispose all packets and flow_queues on a flow_set. * If all=1, also remove red lookup table and other storage, * including the descriptor itself. * For the one in dn_pipe MUST also cleanup ready_heap... */ static void purge_flow_set(struct dn_flow_set *fs, int all) { struct dn_pkt *pkt ; struct dn_flow_queue *q, *qn ; int i ; for (i = 0 ; i <= fs->rq_size ; i++ ) { for (q = fs->rq[i] ; q ; q = qn ) { for (pkt = q->head ; pkt ; ) DN_FREE_PKT(pkt) ; qn = q->next ; free(q, M_IPFW); } fs->rq[i] = NULL ; } fs->rq_elements = 0 ; if (all) { /* RED - free lookup table */ if (fs->w_q_lookup) free(fs->w_q_lookup, M_IPFW); if (fs->rq) free(fs->rq, M_IPFW); /* if this fs is not part of a pipe, free it */ if (fs->pipe && fs != &(fs->pipe->fs) ) free(fs, M_IPFW); } } /* * Dispose all packets queued on a pipe (not a flow_set). * Also free all resources associated to a pipe, which is about * to be deleted. */ static void purge_pipe(struct dn_pipe *pipe) { struct dn_pkt *pkt ; purge_flow_set( &(pipe->fs), 1 ); for (pkt = pipe->head ; pkt ; ) DN_FREE_PKT(pkt) ; heap_free( &(pipe->scheduler_heap) ); heap_free( &(pipe->not_eligible_heap) ); heap_free( &(pipe->idle_heap) ); } /* * Delete all pipes and heaps returning memory. Must also * remove references from all ipfw rules to all pipes. */ static void dummynet_flush() { struct dn_pipe *curr_p, *p ; struct ip_fw *rule ; struct dn_flow_set *fs, *curr_fs; int s ; s = splimp() ; /* remove all references to pipes ...*/ LIST_FOREACH(rule, &ip_fw_chain_head, next) rule->pipe_ptr = NULL ; /* prevent future matches... */ p = all_pipes ; all_pipes = NULL ; fs = all_flow_sets ; all_flow_sets = NULL ; /* and free heaps so we don't have unwanted events */ heap_free(&ready_heap); heap_free(&wfq_ready_heap); heap_free(&extract_heap); splx(s) ; /* * Now purge all queued pkts and delete all pipes */ /* scan and purge all flow_sets. */ for ( ; fs ; ) { curr_fs = fs ; fs = fs->next ; purge_flow_set(curr_fs, 1); } for ( ; p ; ) { purge_pipe(p); curr_p = p ; p = p->next ; free(curr_p, M_IPFW); } } extern struct ip_fw *ip_fw_default_rule ; static void dn_rule_delete_fs(struct dn_flow_set *fs, void *r) { int i ; struct dn_flow_queue *q ; struct dn_pkt *pkt ; for (i = 0 ; i <= fs->rq_size ; i++) /* last one is ovflow */ for (q = fs->rq[i] ; q ; q = q->next ) for (pkt = q->head ; pkt ; pkt = DN_NEXT(pkt) ) if (pkt->hdr.mh_data == r) pkt->hdr.mh_data = (void *)ip_fw_default_rule ; } /* * when a firewall rule is deleted, scan all queues and remove the flow-id * from packets matching this rule. */ void dn_rule_delete(void *r) { struct dn_pipe *p ; struct dn_pkt *pkt ; struct dn_flow_set *fs ; /* * If the rule references a queue (dn_flow_set), then scan * the flow set, otherwise scan pipes. Should do either, but doing * both does not harm. */ for ( fs = all_flow_sets ; fs ; fs = fs->next ) dn_rule_delete_fs(fs, r); for ( p = all_pipes ; p ; p = p->next ) { fs = &(p->fs) ; dn_rule_delete_fs(fs, r); for (pkt = p->head ; pkt ; pkt = DN_NEXT(pkt) ) if (pkt->hdr.mh_data == r) pkt->hdr.mh_data = (void *)ip_fw_default_rule ; } } /* * setup RED parameters */ static int config_red(struct dn_flow_set *p, struct dn_flow_set * x) { int i; x->w_q = p->w_q; x->min_th = SCALE(p->min_th); x->max_th = SCALE(p->max_th); x->max_p = p->max_p; x->c_1 = p->max_p / (p->max_th - p->min_th); x->c_2 = SCALE_MUL(x->c_1, SCALE(p->min_th)); if (x->flags_fs & DN_IS_GENTLE_RED) { x->c_3 = (SCALE(1) - p->max_p) / p->max_th; x->c_4 = (SCALE(1) - 2 * p->max_p); } /* if the lookup table already exist, free and create it again */ if (x->w_q_lookup) free(x->w_q_lookup, M_IPFW); if (red_lookup_depth == 0) { printf("\nnet.inet.ip.dummynet.red_lookup_depth must be > 0"); free(x, M_IPFW); return EINVAL; } x->lookup_depth = red_lookup_depth; x->w_q_lookup = (u_int *) malloc(x->lookup_depth * sizeof(int), M_IPFW, M_DONTWAIT); if (x->w_q_lookup == NULL) { printf("sorry, cannot allocate red lookup table\n"); free(x, M_IPFW); return ENOSPC; } /* fill the lookup table with (1 - w_q)^x */ x->lookup_step = p->lookup_step ; x->lookup_weight = p->lookup_weight ; x->w_q_lookup[0] = SCALE(1) - x->w_q; for (i = 1; i < x->lookup_depth; i++) x->w_q_lookup[i] = SCALE_MUL(x->w_q_lookup[i - 1], x->lookup_weight); if (red_avg_pkt_size < 1) red_avg_pkt_size = 512 ; x->avg_pkt_size = red_avg_pkt_size ; if (red_max_pkt_size < 1) red_max_pkt_size = 1500 ; x->max_pkt_size = red_max_pkt_size ; return 0 ; } static int alloc_hash(struct dn_flow_set *x, struct dn_flow_set *pfs) { if (x->flags_fs & DN_HAVE_FLOW_MASK) { /* allocate some slots */ int l = pfs->rq_size; if (l == 0) l = dn_hash_size; if (l < 4) l = 4; else if (l > 1024) l = 1024; x->rq_size = l; } else /* one is enough for null mask */ x->rq_size = 1; x->rq = malloc((1 + x->rq_size) * sizeof(struct dn_flow_queue *), M_IPFW, M_DONTWAIT | M_ZERO); if (x->rq == NULL) { printf("sorry, cannot allocate queue\n"); return ENOSPC; } x->rq_elements = 0; return 0 ; } static void set_fs_parms(struct dn_flow_set *x, struct dn_flow_set *src) { x->flags_fs = src->flags_fs; x->qsize = src->qsize; x->plr = src->plr; x->flow_mask = src->flow_mask; if (x->flags_fs & DN_QSIZE_IS_BYTES) { if (x->qsize > 1024*1024) x->qsize = 1024*1024 ; } else { if (x->qsize == 0) x->qsize = 50 ; if (x->qsize > 100) x->qsize = 50 ; } /* configuring RED */ if ( x->flags_fs & DN_IS_RED ) config_red(src, x) ; /* XXX should check errors */ } /* * setup pipe or queue parameters. */ static int config_pipe(struct dn_pipe *p) { int s ; struct dn_flow_set *pfs = &(p->fs); /* * The config program passes parameters as follows: * bw = bits/second (0 means no limits), * delay = ms, must be translated into ticks. * qsize = slots/bytes */ p->delay = ( p->delay * hz ) / 1000 ; /* We need either a pipe number or a flow_set number */ if (p->pipe_nr == 0 && pfs->fs_nr == 0) return EINVAL ; if (p->pipe_nr != 0 && pfs->fs_nr != 0) return EINVAL ; if (p->pipe_nr != 0) { /* this is a pipe */ struct dn_pipe *x, *a, *b; /* locate pipe */ for (a = NULL , b = all_pipes ; b && b->pipe_nr < p->pipe_nr ; a = b , b = b->next) ; if (b == NULL || b->pipe_nr != p->pipe_nr) { /* new pipe */ x = malloc(sizeof(struct dn_pipe), M_IPFW, M_DONTWAIT | M_ZERO); if (x == NULL) { printf("ip_dummynet.c: no memory for new pipe\n"); return ENOSPC; } x->pipe_nr = p->pipe_nr; x->fs.pipe = x ; /* idle_heap is the only one from which we extract from the middle. */ x->idle_heap.size = x->idle_heap.elements = 0 ; x->idle_heap.offset=OFFSET_OF(struct dn_flow_queue, heap_pos); } else x = b; x->bandwidth = p->bandwidth ; x->numbytes = 0; /* just in case... */ bcopy(p->if_name, x->if_name, sizeof(p->if_name) ); x->ifp = NULL ; /* reset interface ptr */ x->delay = p->delay ; set_fs_parms(&(x->fs), pfs); if ( x->fs.rq == NULL ) { /* a new pipe */ s = alloc_hash(&(x->fs), pfs) ; if (s) { free(x, M_IPFW); return s ; } s = splimp() ; x->next = b ; if (a == NULL) all_pipes = x ; else a->next = x ; splx(s); } } else { /* config queue */ struct dn_flow_set *x, *a, *b ; /* locate flow_set */ for (a=NULL, b=all_flow_sets ; b && b->fs_nr < pfs->fs_nr ; a = b , b = b->next) ; if (b == NULL || b->fs_nr != pfs->fs_nr) { /* new */ if (pfs->parent_nr == 0) /* need link to a pipe */ return EINVAL ; x = malloc(sizeof(struct dn_flow_set), M_IPFW, M_DONTWAIT | M_ZERO); if (x == NULL) { printf("ip_dummynet.c: no memory for new flow_set\n"); return ENOSPC; } x->fs_nr = pfs->fs_nr; x->parent_nr = pfs->parent_nr; x->weight = pfs->weight ; if (x->weight == 0) x->weight = 1 ; else if (x->weight > 100) x->weight = 100 ; } else { /* Change parent pipe not allowed; must delete and recreate */ if (pfs->parent_nr != 0 && b->parent_nr != pfs->parent_nr) return EINVAL ; x = b; } set_fs_parms(x, pfs); if ( x->rq == NULL ) { /* a new flow_set */ s = alloc_hash(x, pfs) ; if (s) { free(x, M_IPFW); return s ; } s = splimp() ; x->next = b; if (a == NULL) all_flow_sets = x; else a->next = x; splx(s); } } return 0 ; } /* * Helper function to remove from a heap queues which are linked to * a flow_set about to be deleted. */ static void fs_remove_from_heap(struct dn_heap *h, struct dn_flow_set *fs) { int i = 0, found = 0 ; for (; i < h->elements ;) if ( ((struct dn_flow_queue *)h->p[i].object)->fs == fs) { h->elements-- ; h->p[i] = h->p[h->elements] ; found++ ; } else i++ ; if (found) heapify(h); } /* * helper function to remove a pipe from a heap (can be there at most once) */ static void pipe_remove_from_heap(struct dn_heap *h, struct dn_pipe *p) { if (h->elements > 0) { int i = 0 ; for (i=0; i < h->elements ; i++ ) { if (h->p[i].object == p) { /* found it */ h->elements-- ; h->p[i] = h->p[h->elements] ; heapify(h); break ; } } } } /* * drain all queues. Called in case of severe mbuf shortage. */ void dummynet_drain() { struct dn_flow_set *fs; struct dn_pipe *p; struct dn_pkt *pkt; heap_free(&ready_heap); heap_free(&wfq_ready_heap); heap_free(&extract_heap); /* remove all references to this pipe from flow_sets */ for (fs = all_flow_sets; fs; fs= fs->next ) purge_flow_set(fs, 0); for (p = all_pipes; p; p= p->next ) { purge_flow_set(&(p->fs), 0); for (pkt = p->head ; pkt ; ) DN_FREE_PKT(pkt) ; p->head = p->tail = NULL ; } } /* * Fully delete a pipe or a queue, cleaning up associated info. */ static int delete_pipe(struct dn_pipe *p) { int s ; struct ip_fw *rule ; if (p->pipe_nr == 0 && p->fs.fs_nr == 0) return EINVAL ; if (p->pipe_nr != 0 && p->fs.fs_nr != 0) return EINVAL ; if (p->pipe_nr != 0) { /* this is an old-style pipe */ struct dn_pipe *a, *b; struct dn_flow_set *fs; /* locate pipe */ for (a = NULL , b = all_pipes ; b && b->pipe_nr < p->pipe_nr ; a = b , b = b->next) ; if (b == NULL || (b->pipe_nr != p->pipe_nr) ) return EINVAL ; /* not found */ s = splimp() ; /* unlink from list of pipes */ if (a == NULL) all_pipes = b->next ; else a->next = b->next ; /* remove references to this pipe from the ip_fw rules. */ LIST_FOREACH(rule, &ip_fw_chain_head, next) if (rule->pipe_ptr == &(b->fs)) rule->pipe_ptr = NULL ; /* remove all references to this pipe from flow_sets */ for (fs = all_flow_sets; fs; fs= fs->next ) if (fs->pipe == b) { printf("++ ref to pipe %d from fs %d\n", p->pipe_nr, fs->fs_nr); fs->pipe = NULL ; purge_flow_set(fs, 0); } fs_remove_from_heap(&ready_heap, &(b->fs)); purge_pipe(b); /* remove all data associated to this pipe */ /* remove reference to here from extract_heap and wfq_ready_heap */ pipe_remove_from_heap(&extract_heap, b); pipe_remove_from_heap(&wfq_ready_heap, b); splx(s); free(b, M_IPFW); } else { /* this is a WF2Q queue (dn_flow_set) */ struct dn_flow_set *a, *b; /* locate set */ for (a = NULL, b = all_flow_sets ; b && b->fs_nr < p->fs.fs_nr ; a = b , b = b->next) ; if (b == NULL || (b->fs_nr != p->fs.fs_nr) ) return EINVAL ; /* not found */ s = splimp() ; if (a == NULL) all_flow_sets = b->next ; else a->next = b->next ; /* remove references to this flow_set from the ip_fw rules. */ LIST_FOREACH(rule, &ip_fw_chain_head, next) if (rule->pipe_ptr == b) rule->pipe_ptr = NULL ; if (b->pipe != NULL) { /* Update total weight on parent pipe and cleanup parent heaps */ b->pipe->sum -= b->weight * b->backlogged ; fs_remove_from_heap(&(b->pipe->not_eligible_heap), b); fs_remove_from_heap(&(b->pipe->scheduler_heap), b); #if 1 /* XXX should i remove from idle_heap as well ? */ fs_remove_from_heap(&(b->pipe->idle_heap), b); #endif } purge_flow_set(b, 1); splx(s); } return 0 ; } /* * helper function used to copy data from kernel in DUMMYNET_GET */ static char * dn_copy_set(struct dn_flow_set *set, char *bp) { int i, copied = 0 ; struct dn_flow_queue *q, *qp = (struct dn_flow_queue *)bp; for (i = 0 ; i <= set->rq_size ; i++) for (q = set->rq[i] ; q ; q = q->next, qp++ ) { if (q->hash_slot != i) printf("++ at %d: wrong slot (have %d, " "should be %d)\n", copied, q->hash_slot, i); if (q->fs != set) printf("++ at %d: wrong fs ptr (have %p, should be %p)\n", i, q->fs, set); copied++ ; bcopy(q, qp, sizeof( *q ) ); /* cleanup pointers */ qp->next = NULL ; qp->head = qp->tail = NULL ; qp->fs = NULL ; } if (copied != set->rq_elements) printf("++ wrong count, have %d should be %d\n", copied, set->rq_elements); return (char *)qp ; } static int dummynet_get(struct sockopt *sopt) { char *buf, *bp ; /* bp is the "copy-pointer" */ size_t size ; struct dn_flow_set *set ; struct dn_pipe *p ; int s, error=0 ; s = splimp(); /* * compute size of data structures: list of pipes and flow_sets. */ for (p = all_pipes, size = 0 ; p ; p = p->next ) size += sizeof( *p ) + p->fs.rq_elements * sizeof(struct dn_flow_queue); for (set = all_flow_sets ; set ; set = set->next ) size += sizeof ( *set ) + set->rq_elements * sizeof(struct dn_flow_queue); buf = malloc(size, M_TEMP, M_DONTWAIT); if (buf == 0) { splx(s); return ENOBUFS ; } for (p = all_pipes, bp = buf ; p ; p = p->next ) { struct dn_pipe *pipe_bp = (struct dn_pipe *)bp ; /* * copy pipe descriptor into *bp, convert delay back to ms, * then copy the flow_set descriptor(s) one at a time. * After each flow_set, copy the queue descriptor it owns. */ bcopy(p, bp, sizeof( *p ) ); pipe_bp->delay = (pipe_bp->delay * 1000) / hz ; /* * XXX the following is a hack based on ->next being the * first field in dn_pipe and dn_flow_set. The correct * solution would be to move the dn_flow_set to the beginning * of struct dn_pipe. */ pipe_bp->next = (struct dn_pipe *)DN_IS_PIPE ; /* clean pointers */ pipe_bp->head = pipe_bp->tail = NULL ; pipe_bp->fs.next = NULL ; pipe_bp->fs.pipe = NULL ; pipe_bp->fs.rq = NULL ; bp += sizeof( *p ) ; bp = dn_copy_set( &(p->fs), bp ); } for (set = all_flow_sets ; set ; set = set->next ) { struct dn_flow_set *fs_bp = (struct dn_flow_set *)bp ; bcopy(set, bp, sizeof( *set ) ); /* XXX same hack as above */ fs_bp->next = (struct dn_flow_set *)DN_IS_QUEUE ; fs_bp->pipe = NULL ; fs_bp->rq = NULL ; bp += sizeof( *set ) ; bp = dn_copy_set( set, bp ); } splx(s); error = sooptcopyout(sopt, buf, size); FREE(buf, M_TEMP); return error ; } /* * Handler for the various dummynet socket options (get, flush, config, del) */ static int ip_dn_ctl(struct sockopt *sopt) { int error = 0 ; struct dn_pipe *p, tmp_pipe; /* Disallow sets in really-really secure mode. */ if (sopt->sopt_dir == SOPT_SET) { error = securelevel_ge(sopt->sopt_td->td_proc->p_ucred, 3); if (error) return (error); } switch (sopt->sopt_name) { default : printf("ip_dn_ctl -- unknown option %d", sopt->sopt_name); return EINVAL ; case IP_DUMMYNET_GET : error = dummynet_get(sopt); break ; case IP_DUMMYNET_FLUSH : dummynet_flush() ; break ; case IP_DUMMYNET_CONFIGURE : p = &tmp_pipe ; error = sooptcopyin(sopt, p, sizeof *p, sizeof *p); if (error) break ; error = config_pipe(p); break ; case IP_DUMMYNET_DEL : /* remove a pipe or queue */ p = &tmp_pipe ; error = sooptcopyin(sopt, p, sizeof *p, sizeof *p); if (error) break ; error = delete_pipe(p); break ; } return error ; } static void ip_dn_init(void) { printf("DUMMYNET initialized (010124)\n"); all_pipes = NULL ; all_flow_sets = NULL ; ready_heap.size = ready_heap.elements = 0 ; ready_heap.offset = 0 ; wfq_ready_heap.size = wfq_ready_heap.elements = 0 ; wfq_ready_heap.offset = 0 ; extract_heap.size = extract_heap.elements = 0 ; extract_heap.offset = 0 ; ip_dn_ctl_ptr = ip_dn_ctl; timeout(dummynet, NULL, 1); } static ip_dn_ctl_t *old_dn_ctl_ptr ; static int dummynet_modevent(module_t mod, int type, void *data) { int s ; switch (type) { case MOD_LOAD: s = splimp(); old_dn_ctl_ptr = ip_dn_ctl_ptr; ip_dn_init(); splx(s); break; case MOD_UNLOAD: s = splimp(); ip_dn_ctl_ptr = old_dn_ctl_ptr; splx(s); dummynet_flush(); break ; default: break ; } return 0 ; } static moduledata_t dummynet_mod = { "dummynet", dummynet_modevent, NULL } ; DECLARE_MODULE(dummynet, dummynet_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);