system/freebsd-src
system/freebsd-src
1
0
Fork 0
mirror of https://github.com/freebsd/freebsd-src synced 2024-09-23 10:14:55 +00:00
Code Issues Packages Projects Releases Wiki Activity
freebsd-src/sys/netgraph/ng_ppp.c
Archie Cobbs 25792ef324 Change the prototype of the strto* routines to make the second 
parameter a char ** instead of a const char **.  This make these
kernel routines consistent with the corresponding libc userland
routines.

Which is actually 'correct' is debatable, but consistency and
following the spec was deemed more important in this case.

Reviewed by (in concept):	phk, bde
1999-11-24 01:03:08 +00:00

1468 lines
41 KiB
C
Raw Blame History

/*
* ng_ppp.c
*
* Copyright (c) 1996-1999 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* Author: Archie Cobbs <archie@whistle.com>
*
* $FreeBSD$
* $Whistle: ng_ppp.c,v 1.24 1999/11/01 09:24:52 julian Exp $
*/
/*
* PPP node type.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/ctype.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_ppp.h>
#include <netgraph/ng_vjc.h>
#define PROT_VALID(p) (((p) & 0x0101) == 0x0001)
#define PROT_COMPRESSABLE(p) (((p) & 0xff00) == 0x0000)
/* Some PPP protocol numbers we're interested in */
#define PROT_APPLETALK 0x0029
#define PROT_COMPD 0x00fd
#define PROT_CRYPTD 0x0053
#define PROT_IP 0x0021
#define PROT_IPX 0x002b
#define PROT_LCP 0xc021
#define PROT_MP 0x003d
#define PROT_VJCOMP 0x002d
#define PROT_VJUNCOMP 0x002f
/* Multilink PPP definitions */
#define MP_MIN_MRRU 1500 /* per RFC 1990 */
#define MP_INITIAL_SEQ 0 /* per RFC 1990 */
#define MP_MIN_LINK_MRU 32
#define MP_MAX_SEQ_LINGER 64 /* max frags we will hold */
#define MP_INSANE_SEQ_JUMP 128 /* a sequence # jump too far */
#define MP_MIN_FRAG_LEN 6 /* don't frag smaller frames */
#define MP_SHORT_SEQ_MASK 0x00000fff /* short seq # mask */
#define MP_SHORT_SEQ_HIBIT 0x00000800 /* short seq # high bit */
#define MP_SHORT_FIRST_FLAG 0x00008000 /* first fragment in frame */
#define MP_SHORT_LAST_FLAG 0x00004000 /* last fragment in frame */
#define MP_LONG_SEQ_MASK 0x00ffffff /* long seq # mask */
#define MP_LONG_SEQ_HIBIT 0x00800000 /* long seq # high bit */
#define MP_LONG_FIRST_FLAG 0x80000000 /* first fragment in frame */
#define MP_LONG_LAST_FLAG 0x40000000 /* last fragment in frame */
#define MP_SEQ_MASK(priv) ((priv)->conf.recvShortSeq ? \
MP_SHORT_SEQ_MASK : MP_LONG_SEQ_MASK)
/* Sign extension of MP sequence numbers */
#define MP_SHORT_EXTEND(s) (((s) & MP_SHORT_SEQ_HIBIT) ? \
((s) | ~MP_SHORT_SEQ_MASK) : (s))
#define MP_LONG_EXTEND(s) (((s) & MP_LONG_SEQ_HIBIT) ? \
((s) | ~MP_LONG_SEQ_MASK) : (s))
/* Comparision of MP sequence numbers */
#define MP_SHORT_SEQ_DIFF(x,y) (MP_SHORT_EXTEND(x) - MP_SHORT_EXTEND(y))
#define MP_LONG_SEQ_DIFF(x,y) (MP_LONG_EXTEND(x) - MP_LONG_EXTEND(y))
#define MP_SEQ_DIFF(priv,x,y) ((priv)->conf.recvShortSeq ? \
MP_SHORT_SEQ_DIFF((x), (y)) : \
MP_LONG_SEQ_DIFF((x), (y)))
/* We store incoming fragments this way */
struct ng_ppp_frag {
int seq;
u_char first;
u_char last;
struct mbuf *data;
meta_p meta;
CIRCLEQ_ENTRY(ng_ppp_frag) f_qent;
};
/* We keep track of link queue status this way */
struct ng_ppp_link_qstat {
struct timeval lastWrite; /* time of last write */
int bytesInQueue; /* bytes in the queue then */
};
/* We use integer indicies to refer to the non-link hooks */
static const char *const ng_ppp_hook_names[] = {
NG_PPP_HOOK_ATALK,
#define HOOK_INDEX_ATALK 0
NG_PPP_HOOK_BYPASS,
#define HOOK_INDEX_BYPASS 1
NG_PPP_HOOK_COMPRESS,
#define HOOK_INDEX_COMPRESS 2
NG_PPP_HOOK_ENCRYPT,
#define HOOK_INDEX_ENCRYPT 3
NG_PPP_HOOK_DECOMPRESS,
#define HOOK_INDEX_DECOMPRESS 4
NG_PPP_HOOK_DECRYPT,
#define HOOK_INDEX_DECRYPT 5
NG_PPP_HOOK_INET,
#define HOOK_INDEX_INET 6
NG_PPP_HOOK_IPX,
#define HOOK_INDEX_IPX 7
NG_PPP_HOOK_VJC_COMP,
#define HOOK_INDEX_VJC_COMP 8
NG_PPP_HOOK_VJC_IP,
#define HOOK_INDEX_VJC_IP 9
NG_PPP_HOOK_VJC_UNCOMP,
#define HOOK_INDEX_VJC_UNCOMP 10
NG_PPP_HOOK_VJC_VJIP,
#define HOOK_INDEX_VJC_VJIP 11
NULL
#define HOOK_INDEX_MAX 12
};
/* We store index numbers in the hook private pointer. The HOOK_INDEX()
for a hook is either the index (above) for normal hooks, or the ones
complement of the link number for link hooks. */
#define HOOK_INDEX(hook) (*((int16_t *) &(hook)->private))
/* Node private data */
struct ng_ppp_private {
struct ng_ppp_node_config conf;
struct ng_ppp_link_stat bundleStats;
struct ng_ppp_link_stat linkStats[NG_PPP_MAX_LINKS];
hook_p links[NG_PPP_MAX_LINKS];
hook_p hooks[HOOK_INDEX_MAX];
u_char vjCompHooked;
u_char allLinksEqual;
u_short activeLinks[NG_PPP_MAX_LINKS];
u_int numActiveLinks;
u_int lastLink; /* for round robin */
struct ng_ppp_link_qstat qstat[NG_PPP_MAX_LINKS];
CIRCLEQ_HEAD(ng_ppp_fraglist, ng_ppp_frag)
frags; /* incoming fragments */
int mpSeqOut; /* next out MP seq # */
};
typedef struct ng_ppp_private *priv_p;
/* Netgraph node methods */
static ng_constructor_t ng_ppp_constructor;
static ng_rcvmsg_t ng_ppp_rcvmsg;
static ng_shutdown_t ng_ppp_rmnode;
static ng_newhook_t ng_ppp_newhook;
static ng_rcvdata_t ng_ppp_rcvdata;
static ng_disconnect_t ng_ppp_disconnect;
/* Helper functions */
static int ng_ppp_input(node_p node, int bypass,
int linkNum, struct mbuf *m, meta_p meta);
static int ng_ppp_output(node_p node, int bypass, int proto,
int linkNum, struct mbuf *m, meta_p meta);
static int ng_ppp_mp_input(node_p node, int linkNum,
struct mbuf *m, meta_p meta);
static int ng_ppp_mp_output(node_p node, struct mbuf *m, meta_p meta);
static void ng_ppp_mp_strategy(node_p node, int len, int *distrib);
static int ng_ppp_intcmp(const void *v1, const void *v2);
static struct mbuf *ng_ppp_addproto(struct mbuf *m, int proto, int compOK);
static struct mbuf *ng_ppp_prepend(struct mbuf *m, const void *buf, int len);
static int ng_ppp_config_valid(node_p node,
const struct ng_ppp_node_config *newConf);
static void ng_ppp_update(node_p node, int newConf);
static void ng_ppp_free_frags(node_p node);
/* Node type descriptor */
static struct ng_type ng_ppp_typestruct = {
NG_VERSION,
NG_PPP_NODE_TYPE,
NULL,
ng_ppp_constructor,
ng_ppp_rcvmsg,
ng_ppp_rmnode,
ng_ppp_newhook,
NULL,
NULL,
ng_ppp_rcvdata,
ng_ppp_rcvdata,
ng_ppp_disconnect
};
NETGRAPH_INIT(ppp, &ng_ppp_typestruct);
static int *compareLatencies; /* hack for ng_ppp_intcmp() */
/* Address and control field header */
static const u_char ng_ppp_acf[2] = { 0xff, 0x03 };
#define ERROUT(x) do { error = (x); goto done; } while (0)
/************************************************************************
NETGRAPH NODE STUFF
************************************************************************/
/*
* Node type constructor
*/
static int
ng_ppp_constructor(node_p *nodep)
{
priv_p priv;
int error;
/* Allocate private structure */
MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK);
if (priv == NULL)
return (ENOMEM);
bzero(priv, sizeof(*priv));
/* Call generic node constructor */
if ((error = ng_make_node_common(&ng_ppp_typestruct, nodep))) {
FREE(priv, M_NETGRAPH);
return (error);
}
(*nodep)->private = priv;
/* Initialize state */
CIRCLEQ_INIT(&priv->frags);
/* Done */
return (0);
}
/*
* Give our OK for a hook to be added
*/
static int
ng_ppp_newhook(node_p node, hook_p hook, const char *name)
{
const priv_p priv = node->private;
int linkNum = -1;
hook_p *hookPtr = NULL;
int hookIndex = -1;
/* Figure out which hook it is */
if (strncmp(name, NG_PPP_HOOK_LINK_PREFIX, /* a link hook? */
strlen(NG_PPP_HOOK_LINK_PREFIX)) == 0) {
const char *cp;
char *eptr;
cp = name + strlen(NG_PPP_HOOK_LINK_PREFIX);
if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
return (EINVAL);
linkNum = (int)strtoul(cp, &eptr, 10);
if (*eptr != '\0' || linkNum < 0 || linkNum >= NG_PPP_MAX_LINKS)
return (EINVAL);
hookPtr = &priv->links[linkNum];
hookIndex = ~linkNum;
} else { /* must be a non-link hook */
int i;
for (i = 0; ng_ppp_hook_names[i] != NULL; i++) {
if (strcmp(name, ng_ppp_hook_names[i]) == 0) {
hookPtr = &priv->hooks[i];
hookIndex = i;
break;
}
}
if (ng_ppp_hook_names[i] == NULL)
return (EINVAL); /* no such hook */
}
/* See if hook is already connected */
if (*hookPtr != NULL)
return (EISCONN);
/* Disallow more than one link unless multilink is enabled */
if (linkNum != -1 && priv->conf.links[linkNum].enableLink
&& !priv->conf.enableMultilink && priv->numActiveLinks >= 1)
return (ENODEV);
/* OK */
*hookPtr = hook;
HOOK_INDEX(hook) = hookIndex;
ng_ppp_update(node, 0);
return (0);
}
/*
* Receive a control message
*/
static int
ng_ppp_rcvmsg(node_p node, struct ng_mesg *msg,
const char *raddr, struct ng_mesg **rptr)
{
const priv_p priv = node->private;
struct ng_mesg *resp = NULL;
int error = 0;
switch (msg->header.typecookie) {
case NGM_PPP_COOKIE:
switch (msg->header.cmd) {
case NGM_PPP_SET_CONFIG:
{
struct ng_ppp_node_config *const newConf =
(struct ng_ppp_node_config *) msg->data;
/* Check for invalid or illegal config */
if (msg->header.arglen != sizeof(*newConf))
ERROUT(EINVAL);
if (!ng_ppp_config_valid(node, newConf))
ERROUT(EINVAL);
priv->conf = *newConf;
ng_ppp_update(node, 1);
break;
}
case NGM_PPP_GET_CONFIG:
NG_MKRESPONSE(resp, msg, sizeof(priv->conf), M_NOWAIT);
if (resp == NULL)
ERROUT(ENOMEM);
bcopy(&priv->conf, resp->data, sizeof(priv->conf));
break;
case NGM_PPP_GET_LINK_STATS:
case NGM_PPP_CLR_LINK_STATS:
case NGM_PPP_GETCLR_LINK_STATS:
{
struct ng_ppp_link_stat *stats;
u_int16_t linkNum;
if (msg->header.arglen != sizeof(u_int16_t))
ERROUT(EINVAL);
linkNum = *((u_int16_t *) msg->data);
if (linkNum >= NG_PPP_MAX_LINKS
&& linkNum != NG_PPP_BUNDLE_LINKNUM)
ERROUT(EINVAL);
stats = (linkNum == NG_PPP_BUNDLE_LINKNUM) ?
&priv->bundleStats : &priv->linkStats[linkNum];
if (msg->header.cmd != NGM_PPP_CLR_LINK_STATS) {
NG_MKRESPONSE(resp, msg,
sizeof(struct ng_ppp_link_stat), M_NOWAIT);
if (resp == NULL)
ERROUT(ENOMEM);
bcopy(stats, resp->data, sizeof(*stats));
}
if (msg->header.cmd != NGM_PPP_GET_LINK_STATS)
bzero(stats, sizeof(*stats));
break;
}
default:
error = EINVAL;
break;
}
break;
case NGM_VJC_COOKIE:
{
char path[NG_PATHLEN + 1];
node_p origNode;
if ((error = ng_path2node(node, raddr, &origNode, NULL)) != 0)
ERROUT(error);
snprintf(path, sizeof(path), "[%lx]:%s",
(long) node, NG_PPP_HOOK_VJC_IP);
return ng_send_msg(origNode, msg, path, rptr);
break;
}
default:
error = EINVAL;
break;
}
if (rptr)
*rptr = resp;
else if (resp)
FREE(resp, M_NETGRAPH);
done:
FREE(msg, M_NETGRAPH);
return (error);
}
/*
* Receive data on a hook
*/
static int
ng_ppp_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
{
const node_p node = hook->node;
const priv_p priv = node->private;
const int index = HOOK_INDEX(hook);
u_int16_t linkNum = NG_PPP_BUNDLE_LINKNUM;
hook_p outHook = NULL;
int proto = 0, error;
/* Did it come from a link hook? */
if (index < 0) {
/* Convert index into a link number */
linkNum = (u_int16_t)~index;
KASSERT(linkNum < NG_PPP_MAX_LINKS,
("%s: bogus index 0x%x", __FUNCTION__, index));
/* Stats */
priv->linkStats[linkNum].recvFrames++;
priv->linkStats[linkNum].recvOctets += m->m_pkthdr.len;
/* Strip address and control fields, if present */
if (m->m_pkthdr.len >= 2) {
if (m->m_len < 2 && (m = m_pullup(m, 2)) == NULL) {
NG_FREE_DATA(m, meta);
return (ENOBUFS);
}
if (bcmp(mtod(m, u_char *), &ng_ppp_acf, 2) == 0)
m_adj(m, 2);
}
/* Dispatch incoming frame (if not enabled, to bypass) */
return ng_ppp_input(node,
!priv->conf.links[linkNum].enableLink, linkNum, m, meta);
}
/* Get protocol & check if data allowed from this hook */
switch (index) {
/* Outgoing data */
case HOOK_INDEX_ATALK:
if (!priv->conf.enableAtalk) {
NG_FREE_DATA(m, meta);
return (ENXIO);
}
proto = PROT_APPLETALK;
break;
case HOOK_INDEX_IPX:
if (!priv->conf.enableIPX) {
NG_FREE_DATA(m, meta);
return (ENXIO);
}
proto = PROT_IPX;
break;
case HOOK_INDEX_INET:
case HOOK_INDEX_VJC_VJIP:
if (!priv->conf.enableIP) {
NG_FREE_DATA(m, meta);
return (ENXIO);
}
proto = PROT_IP;
break;
case HOOK_INDEX_VJC_COMP:
if (!priv->conf.enableVJCompression) {
NG_FREE_DATA(m, meta);
return (ENXIO);
}
proto = PROT_VJCOMP;
break;
case HOOK_INDEX_VJC_UNCOMP:
if (!priv->conf.enableVJCompression) {
NG_FREE_DATA(m, meta);
return (ENXIO);
}
proto = PROT_VJUNCOMP;
break;
case HOOK_INDEX_COMPRESS:
if (!priv->conf.enableCompression) {
NG_FREE_DATA(m, meta);
return (ENXIO);
}
proto = PROT_COMPD;
break;
case HOOK_INDEX_ENCRYPT:
if (!priv->conf.enableEncryption) {
NG_FREE_DATA(m, meta);
return (ENXIO);
}
proto = PROT_CRYPTD;
break;
case HOOK_INDEX_BYPASS:
if (m->m_pkthdr.len < 4) {
NG_FREE_META(meta);
return (EINVAL);
}
if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) {
NG_FREE_META(meta);
return (ENOBUFS);
}
linkNum = ntohs(mtod(m, u_int16_t *)[0]);
proto = ntohs(mtod(m, u_int16_t *)[1]);
m_adj(m, 4);
if (linkNum >= NG_PPP_MAX_LINKS
&& linkNum != NG_PPP_BUNDLE_LINKNUM)
return (EINVAL);
break;
/* Incoming data */
case HOOK_INDEX_VJC_IP:
if (!priv->conf.enableIP || !priv->conf.enableVJDecompression) {
NG_FREE_DATA(m, meta);
return (ENXIO);
}
break;
case HOOK_INDEX_DECOMPRESS:
if (!priv->conf.enableDecompression) {
NG_FREE_DATA(m, meta);
return (ENXIO);
}
break;
case HOOK_INDEX_DECRYPT:
if (!priv->conf.enableDecryption) {
NG_FREE_DATA(m, meta);
return (ENXIO);
}
break;
default:
panic("%s: bogus index 0x%x", __FUNCTION__, index);
}
/* Now figure out what to do with the frame */
switch (index) {
/* Outgoing data */
case HOOK_INDEX_INET:
if (priv->conf.enableVJCompression && priv->vjCompHooked) {
outHook = priv->hooks[HOOK_INDEX_VJC_IP];
break;
}
/* FALLTHROUGH */
case HOOK_INDEX_ATALK:
case HOOK_INDEX_IPX:
case HOOK_INDEX_VJC_COMP:
case HOOK_INDEX_VJC_UNCOMP:
case HOOK_INDEX_VJC_VJIP:
if (priv->conf.enableCompression
&& priv->hooks[HOOK_INDEX_COMPRESS] != NULL) {
if ((m = ng_ppp_addproto(m, proto, 1)) == NULL) {
NG_FREE_META(meta);
return (ENOBUFS);
}
outHook = priv->hooks[HOOK_INDEX_COMPRESS];
break;
}
/* FALLTHROUGH */
case HOOK_INDEX_COMPRESS:
if (priv->conf.enableEncryption
&& priv->hooks[HOOK_INDEX_ENCRYPT] != NULL) {
if ((m = ng_ppp_addproto(m, proto, 1)) == NULL) {
NG_FREE_META(meta);
return (ENOBUFS);
}
outHook = priv->hooks[HOOK_INDEX_ENCRYPT];
break;
}
/* FALLTHROUGH */
case HOOK_INDEX_ENCRYPT:
return ng_ppp_output(node, 0,
proto, NG_PPP_BUNDLE_LINKNUM, m, meta);
case HOOK_INDEX_BYPASS:
return ng_ppp_output(node, 1, proto, linkNum, m, meta);
/* Incoming data */
case HOOK_INDEX_DECRYPT:
case HOOK_INDEX_DECOMPRESS:
return ng_ppp_input(node, 0, NG_PPP_BUNDLE_LINKNUM, m, meta);
case HOOK_INDEX_VJC_IP:
outHook = priv->hooks[HOOK_INDEX_INET];
break;
}
/* Send packet out hook */
NG_SEND_DATA(error, outHook, m, meta);
return (error);
}
/*
* Destroy node
*/
static int
ng_ppp_rmnode(node_p node)
{
const priv_p priv = node->private;
/* Take down netgraph node */
node->flags |= NG_INVALID;
ng_cutlinks(node);
ng_unname(node);
ng_ppp_free_frags(node);
bzero(priv, sizeof(*priv));
FREE(priv, M_NETGRAPH);
node->private = NULL;
ng_unref(node); /* let the node escape */
return (0);
}
/*
* Hook disconnection
*/
static int
ng_ppp_disconnect(hook_p hook)
{
const node_p node = hook->node;
const priv_p priv = node->private;
const int index = HOOK_INDEX(hook);
/* Zero out hook pointer */
if (index < 0)
priv->links[~index] = NULL;
else
priv->hooks[index] = NULL;
/* Update derived info (or go away if no hooks left) */
if (node->numhooks > 0)
ng_ppp_update(node, 0);
else
ng_rmnode(hook->node);
return (0);
}
/************************************************************************
HELPER STUFF
************************************************************************/
/*
* Handle an incoming frame. Extract the PPP protocol number
* and dispatch accordingly.
*/
static int
ng_ppp_input(node_p node, int bypass, int linkNum, struct mbuf *m, meta_p meta)
{
const priv_p priv = node->private;
hook_p outHook = NULL;
int proto, error;
/* Extract protocol number */
for (proto = 0; !PROT_VALID(proto) && m->m_pkthdr.len > 0; ) {
if (m->m_len < 1 && (m = m_pullup(m, 1)) == NULL) {
NG_FREE_META(meta);
return (ENOBUFS);
}
proto = (proto << 8) + *mtod(m, u_char *);
m_adj(m, 1);
}
if (!PROT_VALID(proto)) {
if (linkNum == NG_PPP_BUNDLE_LINKNUM)
priv->bundleStats.badProtos++;
else
priv->linkStats[linkNum].badProtos++;
NG_FREE_DATA(m, meta);
return (EINVAL);
}
/* Bypass frame? */
if (bypass)
goto bypass;
/* Check protocol */
switch (proto) {
case PROT_COMPD:
if (priv->conf.enableDecompression)
outHook = priv->hooks[HOOK_INDEX_DECOMPRESS];
break;
case PROT_CRYPTD:
if (priv->conf.enableDecryption)
outHook = priv->hooks[HOOK_INDEX_DECRYPT];
break;
case PROT_VJCOMP:
if (priv->conf.enableVJDecompression && priv->vjCompHooked)
outHook = priv->hooks[HOOK_INDEX_VJC_COMP];
break;
case PROT_VJUNCOMP:
if (priv->conf.enableVJDecompression && priv->vjCompHooked)
outHook = priv->hooks[HOOK_INDEX_VJC_UNCOMP];
break;
case PROT_MP:
if (priv->conf.enableMultilink)
return ng_ppp_mp_input(node, linkNum, m, meta);
break;
case PROT_APPLETALK:
if (priv->conf.enableAtalk)
outHook = priv->hooks[HOOK_INDEX_ATALK];
break;
case PROT_IPX:
if (priv->conf.enableIPX)
outHook = priv->hooks[HOOK_INDEX_IPX];
break;
case PROT_IP:
if (priv->conf.enableIP)
outHook = priv->hooks[HOOK_INDEX_INET];
break;
}
/* For unknown/inactive protocols, forward out the bypass hook */
bypass:
if (outHook == NULL) {
u_int16_t hdr[2];
hdr[0] = htons(linkNum);
hdr[1] = htons((u_int16_t)proto);
if ((m = ng_ppp_prepend(m, &hdr, 4)) == NULL)
return (ENOBUFS);
outHook = priv->hooks[HOOK_INDEX_BYPASS];
}
/* Forward frame */
NG_SEND_DATA(error, outHook, m, meta);
return (error);
}
/*
* Deliver a frame out a link, either a real one or NG_PPP_BUNDLE_LINKNUM
* If the link is not enabled then ENXIO is returned, unless "bypass" is != 0.
*/
static int
ng_ppp_output(node_p node, int bypass,
int proto, int linkNum, struct mbuf *m, meta_p meta)
{
const priv_p priv = node->private;
int len, error;
/* If not doing MP, map bundle virtual link to (the only) link */
if (linkNum == NG_PPP_BUNDLE_LINKNUM && !priv->conf.enableMultilink)
linkNum = priv->activeLinks[0];
/* Check link status (if real) */
if (linkNum != NG_PPP_BUNDLE_LINKNUM) {
if (!bypass && !priv->conf.links[linkNum].enableLink)
return (ENXIO);
if (priv->links[linkNum] == NULL) {
NG_FREE_DATA(m, meta);
return (ENETDOWN);
}
}
/* Prepend protocol number, possibly compressed */
if ((m = ng_ppp_addproto(m, proto,
linkNum == NG_PPP_BUNDLE_LINKNUM
|| priv->conf.links[linkNum].enableProtoComp)) == NULL) {
NG_FREE_META(meta);
return (ENOBUFS);
}
/* Special handling for the MP virtual link */
if (linkNum == NG_PPP_BUNDLE_LINKNUM)
return ng_ppp_mp_output(node, m, meta);
/* Prepend address and control field (unless compressed) */
if (proto == PROT_LCP || !priv->conf.links[linkNum].enableACFComp) {
if ((m = ng_ppp_prepend(m, &ng_ppp_acf, 2)) == NULL) {
NG_FREE_META(meta);
return (ENOBUFS);
}
}
/* Deliver frame */
len = m->m_pkthdr.len;
NG_SEND_DATA(error, priv->links[linkNum], m, meta);
/* Update stats and 'bytes in queue' counter */
if (error == 0) {
priv->linkStats[linkNum].xmitFrames++;
priv->linkStats[linkNum].xmitOctets += len;
priv->qstat[linkNum].bytesInQueue += len;
microtime(&priv->qstat[linkNum].lastWrite);
}
return error;
}
/*
* Handle an incoming multi-link fragment
*/
static int
ng_ppp_mp_input(node_p node, int linkNum, struct mbuf *m, meta_p meta)
{
const priv_p priv = node->private;
struct ng_ppp_frag frag0, *frag = &frag0;
struct ng_ppp_frag *qent, *qnext;
struct ng_ppp_frag *first = NULL, *last = NULL;
int diff, highSeq, nextSeq;
struct mbuf *tail;
/* Extract fragment information from MP header */
if (priv->conf.recvShortSeq) {
u_int16_t shdr;
if (m->m_pkthdr.len < 2) {
NG_FREE_DATA(m, meta);
return (EINVAL);
}
if (m->m_len < 2 && (m = m_pullup(m, 2)) == NULL) {
NG_FREE_META(meta);
return (ENOBUFS);
}
shdr = ntohs(*mtod(m, u_int16_t *));
frag->seq = shdr & MP_SHORT_SEQ_MASK;
frag->first = (shdr & MP_SHORT_FIRST_FLAG) != 0;
frag->last = (shdr & MP_SHORT_LAST_FLAG) != 0;
highSeq = CIRCLEQ_EMPTY(&priv->frags) ?
frag->seq : CIRCLEQ_FIRST(&priv->frags)->seq;
diff = MP_SHORT_SEQ_DIFF(frag->seq, highSeq);
m_adj(m, 2);
} else {
u_int32_t lhdr;
if (m->m_pkthdr.len < 4) {
NG_FREE_DATA(m, meta);
return (EINVAL);
}
if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) {
NG_FREE_META(meta);
return (ENOBUFS);
}
lhdr = ntohl(*mtod(m, u_int32_t *));
frag->seq = lhdr & MP_LONG_SEQ_MASK;
frag->first = (lhdr & MP_LONG_FIRST_FLAG) != 0;
frag->last = (lhdr & MP_LONG_LAST_FLAG) != 0;
highSeq = CIRCLEQ_EMPTY(&priv->frags) ?
frag->seq : CIRCLEQ_FIRST(&priv->frags)->seq;
diff = MP_LONG_SEQ_DIFF(frag->seq, highSeq);
m_adj(m, 4);
}
frag->data = m;
frag->meta = meta;
/* If the sequence number makes a large jump, empty the queue */
if (diff <= -MP_INSANE_SEQ_JUMP || diff >= MP_INSANE_SEQ_JUMP)
ng_ppp_free_frags(node);
/* Optimization: handle a frame that's all in one fragment */
if (frag->first && frag->last)
return ng_ppp_input(node, 0, NG_PPP_BUNDLE_LINKNUM, m, meta);
/* Allocate a new frag struct for the queue */
MALLOC(frag, struct ng_ppp_frag *, sizeof(*frag), M_NETGRAPH, M_NOWAIT);
if (frag == NULL) {
NG_FREE_DATA(m, meta);
return (ENOMEM);
}
*frag = frag0;
meta = NULL;
m = NULL;
/* Add fragment to queue, which is reverse sorted by sequence number */
CIRCLEQ_FOREACH(qent, &priv->frags, f_qent) {
diff = MP_SEQ_DIFF(priv, frag->seq, qent->seq);
if (diff > 0) {
CIRCLEQ_INSERT_BEFORE(&priv->frags, qent, frag, f_qent);
break;
} else if (diff == 0) { /* should never happen! */
log(LOG_ERR, "%s: rec'd dup MP fragment\n", node->name);
if (linkNum == NG_PPP_BUNDLE_LINKNUM)
priv->linkStats[linkNum].dupFragments++;
else
priv->bundleStats.dupFragments++;
NG_FREE_DATA(frag->data, frag->meta);
FREE(frag, M_NETGRAPH);
return (EINVAL);
}
}
if (qent == NULL)
CIRCLEQ_INSERT_TAIL(&priv->frags, frag, f_qent);
/* Find the first fragment in the possibly newly completed frame */
for (nextSeq = frag->seq, qent = frag;
qent != (void *) &priv->frags;
qent = CIRCLEQ_PREV(qent, f_qent)) {
if (qent->seq != nextSeq)
goto pruneQueue;
if (qent->first) {
first = qent;
break;
}
nextSeq = (nextSeq - 1) & MP_SEQ_MASK(priv);
}
/* Find the last fragment in the possibly newly completed frame */
for (nextSeq = frag->seq, qent = frag;
qent != (void *) &priv->frags;
qent = CIRCLEQ_NEXT(qent, f_qent)) {
if (qent->seq != nextSeq)
goto pruneQueue;
if (qent->last) {
last = qent;
break;
}
nextSeq = (nextSeq + 1) & MP_SEQ_MASK(priv);
}
/* We have a complete frame, extract it from the queue */
for (tail = NULL, qent = first; qent != NULL; qent = qnext) {
qnext = CIRCLEQ_PREV(qent, f_qent);
CIRCLEQ_REMOVE(&priv->frags, qent, f_qent);
if (tail == NULL) {
tail = m = qent->data;
meta = qent->meta; /* inherit first frag's meta */
} else {
m->m_pkthdr.len += qent->data->m_pkthdr.len;
tail->m_next = qent->data;
NG_FREE_META(qent->meta); /* drop other frags' metas */
}
while (tail->m_next != NULL)
tail = tail->m_next;
if (qent == last)
qnext = NULL;
FREE(qent, M_NETGRAPH);
}
pruneQueue:
/* Prune out stale entries in the queue */
for (qent = CIRCLEQ_LAST(&priv->frags);
qent != (void *) &priv->frags; qent = qnext) {
if (MP_SEQ_DIFF(priv, highSeq, qent->seq) <= MP_MAX_SEQ_LINGER)
break;
qnext = CIRCLEQ_PREV(qent, f_qent);
CIRCLEQ_REMOVE(&priv->frags, qent, f_qent);
NG_FREE_DATA(qent->data, qent->meta);
FREE(qent, M_NETGRAPH);
}
/* Deliver newly completed frame, if any */
return m ? ng_ppp_input(node, 0, NG_PPP_BUNDLE_LINKNUM, m, meta) : 0;
}
/*
* Deliver a frame out on the bundle, i.e., figure out how to fragment
* the frame across the individual PPP links and do so.
*/
static int
ng_ppp_mp_output(node_p node, struct mbuf *m, meta_p meta)
{
const priv_p priv = node->private;
int distrib[NG_PPP_MAX_LINKS];
int firstFragment;
int activeLinkNum;
/* At least one link must be active */
if (priv->numActiveLinks == 0) {
NG_FREE_DATA(m, meta);
return (ENETDOWN);
}
/* Round-robin strategy */
if (priv->conf.enableRoundRobin || m->m_pkthdr.len < MP_MIN_FRAG_LEN) {
activeLinkNum = priv->lastLink++ % priv->numActiveLinks;
bzero(&distrib, priv->numActiveLinks * sizeof(distrib[0]));
distrib[activeLinkNum] = m->m_pkthdr.len;
goto deliver;
}
/* Strategy when all links are equivalent (optimize the common case) */
if (priv->allLinksEqual) {
const int fraction = m->m_pkthdr.len / priv->numActiveLinks;
int i, remain;
for (i = 0; i < priv->numActiveLinks; i++)
distrib[priv->lastLink++ % priv->numActiveLinks]
= fraction;
remain = m->m_pkthdr.len - (fraction * priv->numActiveLinks);
while (remain > 0) {
distrib[priv->lastLink++ % priv->numActiveLinks]++;
remain--;
}
goto deliver;
}
/* Strategy when all links are not equivalent */
ng_ppp_mp_strategy(node, m->m_pkthdr.len, distrib);
deliver:
/* Update stats */
priv->bundleStats.xmitFrames++;
priv->bundleStats.xmitOctets += m->m_pkthdr.len;
/* Send alloted portions of frame out on the link(s) */
for (firstFragment = 1, activeLinkNum = priv->numActiveLinks - 1;
activeLinkNum >= 0; activeLinkNum--) {
const int linkNum = priv->activeLinks[activeLinkNum];
/* Deliver fragment(s) out the next link */
for ( ; distrib[activeLinkNum] > 0; firstFragment = 0) {
int len, lastFragment, error;
struct mbuf *m2;
meta_p meta2;
/* Calculate fragment length; don't exceed link MTU */
len = distrib[activeLinkNum];
if (len > priv->conf.links[linkNum].mru)
len = priv->conf.links[linkNum].mru;
distrib[activeLinkNum] -= len;
lastFragment = (len == m->m_pkthdr.len);
/* Split off next fragment as "m2" */
m2 = m;
if (!lastFragment) {
struct mbuf *n = m_split(m, len, M_NOWAIT);
if (n == NULL) {
NG_FREE_DATA(m, meta);
return (ENOMEM);
}
m = n;
}
/* Prepend MP header */
if (priv->conf.xmitShortSeq) {
u_int16_t shdr;
shdr = priv->mpSeqOut;
priv->mpSeqOut =
(priv->mpSeqOut + 1) % MP_SHORT_SEQ_MASK;
if (firstFragment)
shdr |= MP_SHORT_FIRST_FLAG;
if (lastFragment)
shdr |= MP_SHORT_LAST_FLAG;
shdr = htons(shdr);
m2 = ng_ppp_prepend(m2, &shdr, 2);
} else {
u_int32_t lhdr;
lhdr = priv->mpSeqOut;
priv->mpSeqOut =
(priv->mpSeqOut + 1) % MP_LONG_SEQ_MASK;
if (firstFragment)
lhdr |= MP_LONG_FIRST_FLAG;
if (lastFragment)
lhdr |= MP_LONG_LAST_FLAG;
lhdr = htonl(lhdr);
m2 = ng_ppp_prepend(m2, &lhdr, 4);
}
if (m2 == NULL) {
if (!lastFragment)
m_freem(m);
NG_FREE_META(meta);
return (ENOBUFS);
}
/* Copy the meta information, if any */
if (meta != NULL && !lastFragment) {
MALLOC(meta2, meta_p,
meta->used_len, M_NETGRAPH, M_NOWAIT);
if (meta2 == NULL) {
m_freem(m2);
NG_FREE_DATA(m, meta);
return (ENOMEM);
}
meta2->allocated_len = meta->used_len;
bcopy(meta, meta2, meta->used_len);
} else
meta2 = meta;
/* Send fragment */
error = ng_ppp_output(node, 0,
PROT_MP, linkNum, m2, meta2);
if (error != 0) {
if (!lastFragment)
NG_FREE_DATA(m, meta);
return (error);
}
}
}
/* Done */
return (0);
}
/*
* Computing the optimal fragmentation
* -----------------------------------
*
* This routine tries to compute the optimal fragmentation pattern based
* on each link's latency, bandwidth, and calculated additional latency.
* The latter quantity is the additional latency caused by previously
* written data that has not been transmitted yet.
*
* This algorithm is only useful when not all of the links have the
* same latency and bandwidth values.
*
* The essential idea is to make the last bit of each fragment of the
* frame arrive at the opposite end at the exact same time. This greedy
* algorithm is optimal, in that no other scheduling could result in any
* packet arriving any sooner unless packets are delivered out of order.
*
* Suppose link i has bandwidth b_i (in tens of bytes per milisecond) and
* latency l_i (in miliseconds). Consider the function function f_i(t)
* which is equal to the number of bytes that will have arrived at
* the peer after t miliseconds if we start writing continuously at
* time t = 0. Then f_i(t) = b_i * (t - l_i) = ((b_i * t) - (l_i * b_i).
* That is, f_i(t) is a line with slope b_i and y-intersect -(l_i * b_i).
* Note that the y-intersect is always <= zero because latency can't be
* negative. Note also that really the function is f_i(t) except when
* f_i(t) is negative, in which case the function is zero. To take
* care of this, let Q_i(t) = { if (f_i(t) > 0) return 1; else return 0; }.
* So the actual number of bytes that will have arrived at the peer after
* t miliseconds is f_i(t) * Q_i(t).
*
* At any given time, each link has some additional latency a_i >= 0
* due to previously written fragment(s) which are still in the queue.
* This value is easily computed from the time since last transmission,
* the previous latency value, the number of bytes written, and the
* link's bandwidth.
*
* Assume that l_i includes any a_i already, and that the links are
* sorted by latency, so that l_i <= l_{i+1}.
*
* Let N be the total number of bytes in the current frame we are sending.
*
* Suppose we were to start writing bytes at time t = 0 on all links
* simultaneously, which is the most we can possibly do. Then let
* F(t) be equal to the total number of bytes received by the peer
* after t miliseconds. Then F(t) = Sum_i (f_i(t) * Q_i(t)).
*
* Our goal is simply this: fragment the frame across the links such
* that the peer is able to reconstruct the completed frame as soon as
* possible, i.e., at the least possible value of t. Call this value t_0.
*
* Then it follows that F(t_0) = N. Our strategy is first to find the value
* of t_0, and then deduce how many bytes to write to each link.
*
* Rewriting F(t_0):
*
* t_0 = ( N + Sum_i ( l_i * b_i * Q_i(t_0) ) ) / Sum_i ( b_i * Q_i(t_0) )
*
* Now, we note that Q_i(t) is constant for l_i <= t <= l_{i+1}. t_0 will
* lie in one of these ranges. To find it, we just need to find the i such
* that F(l_i) <= N <= F(l_{i+1}). Then we compute all the constant values
* for Q_i() in this range, plug in the remaining values, solving for t_0.
*
* Once t_0 is known, then the number of bytes to send on link i is
* just f_i(t_0) * Q_i(t_0).
*
* In other words, we start allocating bytes to the links one at a time.
* We keep adding links until the frame is completely sent. Some links
* may not get any bytes because their latency is too high.
*
* Is all this work really worth the trouble? Depends on the situation.
* The bigger the ratio of computer speed to link speed, and the more
* important total bundle latency is (e.g., for interactive response time),
* the more it's worth it. There is however the cost of calling this
* function for every frame. The running time is O(n^2) where n is the
* number of links that receive a non-zero number of bytes.
*
* Since latency is measured in miliseconds, the "resolution" of this
* algorithm is one milisecond.
*
* To avoid this algorithm altogether, configure all links to have the
* same latency and bandwidth.
*/
static void
ng_ppp_mp_strategy(node_p node, int len, int *distrib)
{
const priv_p priv = node->private;
int latency[NG_PPP_MAX_LINKS];
int sortByLatency[NG_PPP_MAX_LINKS];
int activeLinkNum, linkNum;
int t0, total, topSum, botSum;
struct timeval now;
int i, numFragments;
/* If only one link, this gets real easy */
if (priv->numActiveLinks == 1) {
distrib[0] = len;
return;
}
/* Get current time */
microtime(&now);
/* Compute latencies for each link at this point in time */
for (activeLinkNum = 0;
activeLinkNum < priv->numActiveLinks; activeLinkNum++) {
struct timeval diff;
int xmitBytes;
/* Start with base latency value */
linkNum = priv->activeLinks[activeLinkNum];
latency[activeLinkNum] = priv->conf.links[linkNum].latency;
sortByLatency[activeLinkNum] = activeLinkNum; /* see below */
/* Any additional latency? */
if (priv->qstat[activeLinkNum].bytesInQueue == 0)
continue;
/* Compute time delta since last write */
diff = now;
timevalsub(&diff, &priv->qstat[activeLinkNum].lastWrite);
if (now.tv_sec < 0 || diff.tv_sec >= 10) { /* sanity */
priv->qstat[activeLinkNum].bytesInQueue = 0;
continue;
}
/* How many bytes could have transmitted since last write? */
xmitBytes = priv->conf.links[linkNum].bandwidth * diff.tv_sec
+ (priv->conf.links[linkNum].bandwidth
* (diff.tv_usec / 1000)) / 100;
priv->qstat[activeLinkNum].bytesInQueue -= xmitBytes;
if (priv->qstat[activeLinkNum].bytesInQueue < 0)
priv->qstat[activeLinkNum].bytesInQueue = 0;
else
latency[activeLinkNum] +=
(100 * priv->qstat[activeLinkNum].bytesInQueue)
/ priv->conf.links[linkNum].bandwidth;
}
/* Sort links by latency */
compareLatencies = latency;
qsort(sortByLatency,
priv->numActiveLinks, sizeof(*sortByLatency), ng_ppp_intcmp);
compareLatencies = NULL;
/* Find the interval we need (add links in sortByLatency[] order) */
for (numFragments = 1;
numFragments < priv->numActiveLinks; numFragments++) {
for (total = i = 0; i < numFragments; i++) {
int flowTime;
flowTime = latency[sortByLatency[numFragments]]
- latency[sortByLatency[i]];
total += ((flowTime * priv->conf.links[
priv->activeLinks[sortByLatency[i]]].bandwidth)
+ 99) / 100;
}
if (total >= len)
break;
}
/* Solve for t_0 in that interval */
for (topSum = botSum = i = 0; i < numFragments; i++) {
int bw = priv->conf.links[
priv->activeLinks[sortByLatency[i]]].bandwidth;
topSum += latency[sortByLatency[i]] * bw; /* / 100 */
botSum += bw; /* / 100 */
}
t0 = ((len * 100) + topSum + botSum / 2) / botSum;
/* Compute f_i(t_0) all i */
bzero(distrib, priv->numActiveLinks * sizeof(*distrib));
for (total = i = 0; i < numFragments; i++) {
int bw = priv->conf.links[
priv->activeLinks[sortByLatency[i]]].bandwidth;
distrib[sortByLatency[i]] =
(bw * (t0 - latency[sortByLatency[i]]) + 50) / 100;
total += distrib[sortByLatency[i]];
}
/* Deal with any rounding error */
if (total < len) {
int fast = 0;
/* Find the fastest link */
for (i = 1; i < numFragments; i++) {
if (priv->conf.links[
priv->activeLinks[sortByLatency[i]]].bandwidth >
priv->conf.links[
priv->activeLinks[sortByLatency[fast]]].bandwidth)
fast = i;
}
distrib[sortByLatency[fast]] += len - total;
} else while (total > len) {
int delta, slow = 0;
/* Find the slowest link that still has bytes to remove */
for (i = 1; i < numFragments; i++) {
if (distrib[sortByLatency[slow]] == 0
|| (distrib[sortByLatency[i]] > 0
&& priv->conf.links[priv->activeLinks[
sortByLatency[i]]].bandwidth <
priv->conf.links[priv->activeLinks[
sortByLatency[slow]]].bandwidth))
slow = i;
}
delta = total - len;
if (delta > distrib[sortByLatency[slow]])
delta = distrib[sortByLatency[slow]];
distrib[sortByLatency[slow]] -= delta;
total -= delta;
}
}
/*
* Compare two integers
*/
static int
ng_ppp_intcmp(const void *v1, const void *v2)
{
const int index1 = *((const int *) v1);
const int index2 = *((const int *) v2);
return compareLatencies[index1] - compareLatencies[index2];
}
/*
* Prepend a possibly compressed PPP protocol number in front of a frame
*/
static struct mbuf *
ng_ppp_addproto(struct mbuf *m, int proto, int compOK)
{
if (compOK && PROT_COMPRESSABLE(proto)) {
u_char pbyte = (u_char)proto;
return ng_ppp_prepend(m, &pbyte, 1);
} else {
u_int16_t pword = htons((u_int16_t)proto);
return ng_ppp_prepend(m, &pword, 2);
}
}
/*
* Prepend some bytes to an mbuf
*/
static struct mbuf *
ng_ppp_prepend(struct mbuf *m, const void *buf, int len)
{
M_PREPEND(m, len, M_NOWAIT);
if (m == NULL || (m->m_len < len && (m = m_pullup(m, len)) == NULL))
return (NULL);
bcopy(buf, mtod(m, u_char *), len);
return (m);
}
/*
* Update private information that is derived from other private information
*/
static void
ng_ppp_update(node_p node, int newConf)
{
const priv_p priv = node->private;
int i;
/* Update active status for VJ Compression */
priv->vjCompHooked = priv->hooks[HOOK_INDEX_VJC_IP] != NULL
&& priv->hooks[HOOK_INDEX_VJC_COMP] != NULL
&& priv->hooks[HOOK_INDEX_VJC_UNCOMP] != NULL
&& priv->hooks[HOOK_INDEX_VJC_VJIP] != NULL;
/* Increase latency for each link an amount equal to one MP header */
if (newConf) {
for (i = 0; i < NG_PPP_MAX_LINKS; i++) {
int hdrBytes;
hdrBytes = (priv->conf.links[i].enableACFComp ? 0 : 2)
+ (priv->conf.links[i].enableProtoComp ? 1 : 2)
+ (priv->conf.xmitShortSeq ? 2 : 4);
priv->conf.links[i].latency +=
((hdrBytes * priv->conf.links[i].bandwidth) + 50)
/ 100;
}
}
/* Update list of active links */
bzero(&priv->activeLinks, sizeof(priv->activeLinks));
priv->numActiveLinks = 0;
priv->allLinksEqual = 1;
for (i = 0; i < NG_PPP_MAX_LINKS; i++) {
struct ng_ppp_link_config *const lc = &priv->conf.links[i];
if (lc->enableLink && priv->links[i] != NULL) {
priv->activeLinks[priv->numActiveLinks++] = i;
if (lc->latency !=
priv->conf.links[priv->activeLinks[0]].latency
|| lc->bandwidth !=
priv->conf.links[priv->activeLinks[0]].bandwidth)
priv->allLinksEqual = 0;
}
}
/* Reset MP state if multi-link is no longer active */
if (!priv->conf.enableMultilink || priv->numActiveLinks == 0) {
ng_ppp_free_frags(node);
priv->mpSeqOut = MP_INITIAL_SEQ;
bzero(&priv->qstat, sizeof(priv->qstat));
}
}
/*
* Determine if a new configuration would represent a valid change
* from the current configuration and link activity status.
*/
static int
ng_ppp_config_valid(node_p node, const struct ng_ppp_node_config *newConf)
{
const priv_p priv = node->private;
int i, newNumLinksActive;
/* Check per-link config and count how many links would be active */
for (newNumLinksActive = i = 0; i < NG_PPP_MAX_LINKS; i++) {
if (newConf->links[i].enableLink && priv->links[i] != NULL)
newNumLinksActive++;
if (!newConf->links[i].enableLink)
continue;
if (newConf->links[i].mru < MP_MIN_LINK_MRU)
return (0);
if (newConf->links[i].bandwidth == 0)
return (0);
if (newConf->links[i].bandwidth > NG_PPP_MAX_BANDWIDTH)
return (0);
if (newConf->links[i].latency > NG_PPP_MAX_LATENCY)
return (0);
}
/* Check bundle parameters */
if (newConf->enableMultilink && newConf->mrru < MP_MIN_MRRU)
return (0);
/* Disallow changes to multi-link configuration while MP is active */
if (priv->numActiveLinks > 0 && newNumLinksActive > 0) {
if (!priv->conf.enableMultilink != !newConf->enableMultilink
|| !priv->conf.xmitShortSeq != !newConf->xmitShortSeq
|| !priv->conf.recvShortSeq != !newConf->recvShortSeq)
return (0);
}
/* At most one link can be active unless multi-link is enabled */
if (!newConf->enableMultilink && newNumLinksActive > 1)
return (0);
/* Configuration change would be valid */
return (1);
}
/*
* Free all entries in the fragment queue
*/
static void
ng_ppp_free_frags(node_p node)
{
const priv_p priv = node->private;
struct ng_ppp_frag *qent, *next;
for (qent = CIRCLEQ_FIRST(&priv->frags);
qent != (void *) &priv->frags; qent = next) {
next = CIRCLEQ_NEXT(qent, f_qent);
NG_FREE_DATA(qent->data, qent->meta);
FREE(qent, M_NETGRAPH);
}
CIRCLEQ_INIT(&priv->frags);
}
Reference in a new issue View git blame Copy permalink