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Diffstat (limited to 'src/link.c')
-rw-r--r-- | src/link.c | 412 |
1 files changed, 412 insertions, 0 deletions
diff --git a/src/link.c b/src/link.c new file mode 100644 index 0000000..44be029 --- /dev/null +++ b/src/link.c @@ -0,0 +1,412 @@ +/*- + * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org> + * 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: src/usr.sbin/ppp/link.c,v 1.21.26.1 2010/12/21 17:10:29 kensmith Exp $ + * + */ + +#include <sys/types.h> +#include <netinet/in_systm.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <netinet/in.h> +#include <netinet/ip.h> + +#include <stdarg.h> +#include <stdio.h> +#include <string.h> +#include <termios.h> + +#include "defs.h" +#include "layer.h" +#include "mbuf.h" +#include "log.h" +#include "timer.h" +#include "lqr.h" +#include "hdlc.h" +#include "throughput.h" +#include "proto.h" +#include "fsm.h" +#include "descriptor.h" +#include "lcp.h" +#include "ccp.h" +#include "link.h" +#include "prompt.h" +#include "async.h" +#include "physical.h" +#include "mp.h" +#include "iplist.h" +#include "slcompress.h" +#include "ncpaddr.h" +#include "ip.h" +#include "ipcp.h" +#include "ipv6cp.h" +#include "auth.h" +#include "pap.h" +#include "chap.h" +#include "cbcp.h" +#include "command.h" + +static void Despatch(struct bundle *, struct link *, struct mbuf *, u_short); + +static inline void +link_AddInOctets(struct link *l, int n) +{ + if (l->stats.gather) { + throughput_addin(&l->stats.total, n); + if (l->stats.parent) + throughput_addin(l->stats.parent, n); + } +} + +static inline void +link_AddOutOctets(struct link *l, int n) +{ + if (l->stats.gather) { + throughput_addout(&l->stats.total, n); + if (l->stats.parent) + throughput_addout(l->stats.parent, n); + } +} + +void +link_SequenceQueue(struct link *l) +{ + struct mqueue *queue, *highest; + + log_Printf(LogDEBUG, "link_SequenceQueue\n"); + + highest = LINK_HIGHQ(l); + for (queue = l->Queue; queue < highest; queue++) + while (queue->len) + m_enqueue(highest, m_dequeue(queue)); +} + +void +link_DeleteQueue(struct link *l) +{ + struct mqueue *queue, *highest; + + highest = LINK_HIGHQ(l); + for (queue = l->Queue; queue <= highest; queue++) + while (queue->top) + m_freem(m_dequeue(queue)); +} + +size_t +link_QueueLen(struct link *l) +{ + unsigned i; + size_t len; + + for (i = 0, len = 0; i < LINK_QUEUES(l); i++) + len += l->Queue[i].len; + + return len; +} + +size_t +link_QueueBytes(struct link *l) +{ + unsigned i; + size_t len, bytes; + struct mbuf *m; + + bytes = 0; + for (i = 0, len = 0; i < LINK_QUEUES(l); i++) { + len = l->Queue[i].len; + m = l->Queue[i].top; + while (len--) { + bytes += m_length(m); + m = m->m_nextpkt; + } + } + + return bytes; +} + +void +link_PendingLowPriorityData(struct link *l, size_t *pkts, size_t *octets) +{ + struct mqueue *queue, *highest; + struct mbuf *m; + size_t len; + + /* + * This is all rfc1989 stuff... because our LQR packet is going to bypass + * everything that's not in the highest priority queue, we must be able to + * subtract that data from our outgoing packet/octet counts. However, + * we've already async-encoded our data at this point, but the async + * encodings MUSTn't be a part of the LQR-reported payload :( So, we have + * the async layer record how much it's padded the packet in the mbuf's + * priv field, and when we calculate our outgoing LQR values we subtract + * this value for each packet from the octet count sent. + */ + + highest = LINK_HIGHQ(l); + *pkts = *octets = 0; + for (queue = l->Queue; queue < highest; queue++) { + len = queue->len; + *pkts += len; + for (m = queue->top; len--; m = m->m_nextpkt) + *octets += m_length(m) - m->priv; + } +} + +struct mbuf * +link_Dequeue(struct link *l) +{ + int pri; + struct mbuf *bp; + + for (bp = NULL, pri = LINK_QUEUES(l) - 1; pri >= 0; pri--) + if (l->Queue[pri].len) { + bp = m_dequeue(l->Queue + pri); + log_Printf(LogDEBUG, "link_Dequeue: Dequeued from queue %d," + " containing %lu more packets\n", pri, + (u_long)l->Queue[pri].len); + break; + } + + return bp; +} + +static struct protostatheader { + u_short number; + const char *name; +} ProtocolStat[NPROTOSTAT] = { + { PROTO_IP, "IP" }, + { PROTO_VJUNCOMP, "VJ_UNCOMP" }, + { PROTO_VJCOMP, "VJ_COMP" }, + { PROTO_COMPD, "COMPD" }, + { PROTO_ICOMPD, "ICOMPD" }, + { PROTO_LCP, "LCP" }, + { PROTO_IPCP, "IPCP" }, + { PROTO_CCP, "CCP" }, + { PROTO_PAP, "PAP" }, + { PROTO_LQR, "LQR" }, + { PROTO_CHAP, "CHAP" }, + { PROTO_MP, "MULTILINK" }, + { 0, "Others" } +}; + +void +link_ProtocolRecord(struct link *l, u_short proto, int type) +{ + int i; + + for (i = 0; i < NPROTOSTAT; i++) + if (ProtocolStat[i].number == proto) + break; + + if (type == PROTO_IN) + l->proto_in[i]++; + else + l->proto_out[i]++; +} + +void +link_ReportProtocolStatus(struct link *l, struct prompt *prompt) +{ + int i; + + prompt_Printf(prompt, " Protocol in out " + "Protocol in out\n"); + for (i = 0; i < NPROTOSTAT; i++) { + prompt_Printf(prompt, " %-9s: %8lu, %8lu", + ProtocolStat[i].name, l->proto_in[i], l->proto_out[i]); + if ((i % 2) == 0) + prompt_Printf(prompt, "\n"); + } + if (!(i % 2)) + prompt_Printf(prompt, "\n"); +} + +void +link_PushPacket(struct link *l, struct mbuf *bp, struct bundle *b, int pri, + u_short proto) +{ + int layer; + + /* + * When we ``push'' a packet into the link, it gets processed by the + * ``push'' function in each layer starting at the top. + * We never expect the result of a ``push'' to be more than one + * packet (as we do with ``pull''s). + */ + + if(pri < 0 || (unsigned)pri >= LINK_QUEUES(l)) + pri = 0; + + bp->priv = 0; /* Adjusted by the async layer ! */ + for (layer = l->nlayers; layer && bp; layer--) + if (l->layer[layer - 1]->push != NULL) + bp = (*l->layer[layer - 1]->push)(b, l, bp, pri, &proto); + + if (bp) { + link_AddOutOctets(l, m_length(bp)); + log_Printf(LogDEBUG, "link_PushPacket: Transmit proto 0x%04x\n", proto); + m_enqueue(l->Queue + pri, m_pullup(bp)); + } +} + +void +link_PullPacket(struct link *l, char *buf, size_t len, struct bundle *b) +{ + struct mbuf *bp, *lbp[LAYER_MAX], *next; + u_short lproto[LAYER_MAX], proto; + int layer; + + /* + * When we ``pull'' a packet from the link, it gets processed by the + * ``pull'' function in each layer starting at the bottom. + * Each ``pull'' may produce multiple packets, chained together using + * bp->m_nextpkt. + * Each packet that results from each pull has to be pulled through + * all of the higher layers before the next resulting packet is pulled + * through anything; this ensures that packets that depend on the + * fsm state resulting from the receipt of the previous packet aren't + * surprised. + */ + + link_AddInOctets(l, len); + + memset(lbp, '\0', sizeof lbp); + lbp[0] = m_get(len, MB_UNKNOWN); + memcpy(MBUF_CTOP(lbp[0]), buf, len); + lproto[0] = 0; + layer = 0; + + while (layer || lbp[layer]) { + if (lbp[layer] == NULL) { + layer--; + continue; + } + bp = lbp[layer]; + lbp[layer] = bp->m_nextpkt; + bp->m_nextpkt = NULL; + proto = lproto[layer]; + + if (l->layer[layer]->pull != NULL) + bp = (*l->layer[layer]->pull)(b, l, bp, &proto); + + if (layer == l->nlayers - 1) { + /* We've just done the top layer, despatch the packet(s) */ + while (bp) { + next = bp->m_nextpkt; + bp->m_nextpkt = NULL; + log_Printf(LogDEBUG, "link_PullPacket: Despatch proto 0x%04x\n", proto); + Despatch(b, l, bp, proto); + bp = next; + } + } else { + lbp[++layer] = bp; + lproto[layer] = proto; + } + } +} + +int +link_Stack(struct link *l, struct layer *layer) +{ + if (l->nlayers == sizeof l->layer / sizeof l->layer[0]) { + log_Printf(LogERROR, "%s: Oops, cannot stack a %s layer...\n", + l->name, layer->name); + return 0; + } + l->layer[l->nlayers++] = layer; + return 1; +} + +void +link_EmptyStack(struct link *l) +{ + l->nlayers = 0; +} + +static const struct { + u_short proto; + struct mbuf *(*fn)(struct bundle *, struct link *, struct mbuf *); +} despatcher[] = { + { PROTO_IP, ipv4_Input }, +#ifndef NOINET6 + { PROTO_IPV6, ipv6_Input }, +#endif + { PROTO_MP, mp_Input }, + { PROTO_LCP, lcp_Input }, + { PROTO_IPCP, ipcp_Input }, +#ifndef NOINET6 + { PROTO_IPV6CP, ipv6cp_Input }, +#endif + { PROTO_PAP, pap_Input }, + { PROTO_CHAP, chap_Input }, + { PROTO_CCP, ccp_Input }, + { PROTO_LQR, lqr_Input }, + { PROTO_CBCP, cbcp_Input } +}; + +#define DSIZE (sizeof despatcher / sizeof despatcher[0]) + +static void +Despatch(struct bundle *bundle, struct link *l, struct mbuf *bp, u_short proto) +{ + unsigned f; + + for (f = 0; f < DSIZE; f++) + if (despatcher[f].proto == proto) { + bp = (*despatcher[f].fn)(bundle, l, bp); + break; + } + + if (bp) { + struct physical *p = link2physical(l); + + log_Printf(LogPHASE, "%s protocol 0x%04x (%s)\n", + f == DSIZE ? "Unknown" : "Unexpected", proto, + hdlc_Protocol2Nam(proto)); + bp = m_pullup(proto_Prepend(bp, proto, 0, 0)); + lcp_SendProtoRej(&l->lcp, MBUF_CTOP(bp), bp->m_len); + if (p) { + p->hdlc.lqm.ifInDiscards++; + p->hdlc.stats.unknownproto++; + } + m_freem(bp); + } +} + +int +link_ShowLayers(struct cmdargs const *arg) +{ + struct link *l = command_ChooseLink(arg); + int layer; + + for (layer = l->nlayers; layer; layer--) + prompt_Printf(arg->prompt, "%s%s", layer == l->nlayers ? "" : ", ", + l->layer[layer - 1]->name); + if (l->nlayers) + prompt_Printf(arg->prompt, "\n"); + + return 0; +} |