2 * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/usr.sbin/ppp/link.c,v 1.16.2.2 2002/09/01 02:12:28 brian Exp $
27 * $DragonFly: src/usr.sbin/ppp/link.c,v 1.3 2008/05/19 10:19:49 corecode Exp $
31 #include <sys/types.h>
32 #include <sys/select.h>
33 #include <netinet/in_systm.h>
34 #include <sys/socket.h>
36 #include <netinet/in.h>
37 #include <netinet/ip.h>
51 #include "throughput.h"
54 #include "descriptor.h"
63 #include "slcompress.h"
74 static void Despatch(struct bundle *, struct link *, struct mbuf *, u_short);
77 link_AddInOctets(struct link *l, int n)
79 if (l->stats.gather) {
80 throughput_addin(&l->stats.total, n);
82 throughput_addin(l->stats.parent, n);
87 link_AddOutOctets(struct link *l, int n)
89 if (l->stats.gather) {
90 throughput_addout(&l->stats.total, n);
92 throughput_addout(l->stats.parent, n);
97 link_SequenceQueue(struct link *l)
99 struct mqueue *queue, *highest;
101 log_Printf(LogDEBUG, "link_SequenceQueue\n");
103 highest = LINK_HIGHQ(l);
104 for (queue = l->Queue; queue < highest; queue++)
106 m_enqueue(highest, m_dequeue(queue));
110 link_DeleteQueue(struct link *l)
112 struct mqueue *queue, *highest;
114 highest = LINK_HIGHQ(l);
115 for (queue = l->Queue; queue <= highest; queue++)
117 m_freem(m_dequeue(queue));
121 link_QueueLen(struct link *l)
126 for (i = 0, len = 0; i < LINK_QUEUES(l); i++)
127 len += l->Queue[i].len;
133 link_QueueBytes(struct link *l)
140 for (i = 0, len = 0; i < LINK_QUEUES(l); i++) {
141 len = l->Queue[i].len;
144 bytes += m_length(m);
153 link_Dequeue(struct link *l)
158 for (bp = NULL, pri = LINK_QUEUES(l) - 1; pri >= 0; pri--)
159 if (l->Queue[pri].len) {
160 bp = m_dequeue(l->Queue + pri);
161 log_Printf(LogDEBUG, "link_Dequeue: Dequeued from queue %d,"
162 " containing %lu more packets\n", pri,
163 (u_long)l->Queue[pri].len);
170 static struct protostatheader {
173 } ProtocolStat[NPROTOSTAT] = {
175 { PROTO_VJUNCOMP, "VJ_UNCOMP" },
176 { PROTO_VJCOMP, "VJ_COMP" },
177 { PROTO_COMPD, "COMPD" },
178 { PROTO_ICOMPD, "ICOMPD" },
179 { PROTO_LCP, "LCP" },
180 { PROTO_IPCP, "IPCP" },
181 { PROTO_CCP, "CCP" },
182 { PROTO_PAP, "PAP" },
183 { PROTO_LQR, "LQR" },
184 { PROTO_CHAP, "CHAP" },
185 { PROTO_MP, "MULTILINK" },
190 link_ProtocolRecord(struct link *l, u_short proto, int type)
194 for (i = 0; i < NPROTOSTAT; i++)
195 if (ProtocolStat[i].number == proto)
198 if (type == PROTO_IN)
205 link_ReportProtocolStatus(struct link *l, struct prompt *prompt)
209 prompt_Printf(prompt, " Protocol in out "
210 "Protocol in out\n");
211 for (i = 0; i < NPROTOSTAT; i++) {
212 prompt_Printf(prompt, " %-9s: %8lu, %8lu",
213 ProtocolStat[i].name, l->proto_in[i], l->proto_out[i]);
215 prompt_Printf(prompt, "\n");
218 prompt_Printf(prompt, "\n");
222 link_PushPacket(struct link *l, struct mbuf *bp, struct bundle *b, int pri,
228 * When we ``push'' a packet into the link, it gets processed by the
229 * ``push'' function in each layer starting at the top.
230 * We never expect the result of a ``push'' to be more than one
231 * packet (as we do with ``pull''s).
234 if(pri < 0 || pri >= LINK_QUEUES(l))
237 for (layer = l->nlayers; layer && bp; layer--)
238 if (l->layer[layer - 1]->push != NULL)
239 bp = (*l->layer[layer - 1]->push)(b, l, bp, pri, &proto);
242 link_AddOutOctets(l, m_length(bp));
243 log_Printf(LogDEBUG, "link_PushPacket: Transmit proto 0x%04x\n", proto);
244 m_enqueue(l->Queue + pri, m_pullup(bp));
249 link_PullPacket(struct link *l, char *buf, size_t len, struct bundle *b)
251 struct mbuf *bp, *lbp[LAYER_MAX], *next;
252 u_short lproto[LAYER_MAX], proto;
256 * When we ``pull'' a packet from the link, it gets processed by the
257 * ``pull'' function in each layer starting at the bottom.
258 * Each ``pull'' may produce multiple packets, chained together using
260 * Each packet that results from each pull has to be pulled through
261 * all of the higher layers before the next resulting packet is pulled
262 * through anything; this ensures that packets that depend on the
263 * fsm state resulting from the receipt of the previous packet aren't
267 link_AddInOctets(l, len);
269 memset(lbp, '\0', sizeof lbp);
270 lbp[0] = m_get(len, MB_UNKNOWN);
271 memcpy(MBUF_CTOP(lbp[0]), buf, len);
275 while (layer || lbp[layer]) {
276 if (lbp[layer] == NULL) {
281 lbp[layer] = bp->m_nextpkt;
282 bp->m_nextpkt = NULL;
283 proto = lproto[layer];
285 if (l->layer[layer]->pull != NULL)
286 bp = (*l->layer[layer]->pull)(b, l, bp, &proto);
288 if (layer == l->nlayers - 1) {
289 /* We've just done the top layer, despatch the packet(s) */
291 next = bp->m_nextpkt;
292 bp->m_nextpkt = NULL;
293 log_Printf(LogDEBUG, "link_PullPacket: Despatch proto 0x%04x\n", proto);
294 Despatch(b, l, bp, proto);
299 lproto[layer] = proto;
305 link_Stack(struct link *l, struct layer *layer)
307 if (l->nlayers == sizeof l->layer / sizeof l->layer[0]) {
308 log_Printf(LogERROR, "%s: Oops, cannot stack a %s layer...\n",
309 l->name, layer->name);
312 l->layer[l->nlayers++] = layer;
317 link_EmptyStack(struct link *l)
322 static const struct {
324 struct mbuf *(*fn)(struct bundle *, struct link *, struct mbuf *);
326 { PROTO_IP, ipv4_Input },
328 { PROTO_IPV6, ipv6_Input },
330 { PROTO_MP, mp_Input },
331 { PROTO_LCP, lcp_Input },
332 { PROTO_IPCP, ipcp_Input },
334 { PROTO_IPV6CP, ipv6cp_Input },
336 { PROTO_PAP, pap_Input },
337 { PROTO_CHAP, chap_Input },
338 { PROTO_CCP, ccp_Input },
339 { PROTO_LQR, lqr_Input },
340 { PROTO_CBCP, cbcp_Input }
343 #define DSIZE (sizeof despatcher / sizeof despatcher[0])
346 Despatch(struct bundle *bundle, struct link *l, struct mbuf *bp, u_short proto)
350 for (f = 0; f < DSIZE; f++)
351 if (despatcher[f].proto == proto) {
352 bp = (*despatcher[f].fn)(bundle, l, bp);
357 struct physical *p = link2physical(l);
359 log_Printf(LogPHASE, "%s protocol 0x%04x (%s)\n",
360 f == DSIZE ? "Unknown" : "Unexpected", proto,
361 hdlc_Protocol2Nam(proto));
362 bp = m_pullup(proto_Prepend(bp, proto, 0, 0));
363 lcp_SendProtoRej(&l->lcp, MBUF_CTOP(bp), bp->m_len);
365 p->hdlc.lqm.SaveInDiscards++;
366 p->hdlc.stats.unknownproto++;
373 link_ShowLayers(struct cmdargs const *arg)
375 struct link *l = command_ChooseLink(arg);
378 for (layer = l->nlayers; layer; layer--)
379 prompt_Printf(arg->prompt, "%s%s", layer == l->nlayers ? "" : ", ",
380 l->layer[layer - 1]->name);
382 prompt_Printf(arg->prompt, "\n");