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- /* IP interface control and configuration routines
- * Copyright 1991 Phil Karn, KA9Q
- */
- #include <stdio.h>
- #include "global.h"
- #include "mbuf.h"
- #include "proc.h"
- #include "iface.h"
- #include "ip.h"
- #include "netuser.h"
- #include "ax25.h"
- #include "enet.h"
- #include "pktdrvr.h"
- #include "cmdparse.h"
- #include "commands.h"
- #include "trace.h"
-
- static void showiface __ARGS((struct iface *ifp));
- static int mask2width __ARGS((int32 mask));
- static int ifipaddr __ARGS((int argc,char *argv[],void *p));
- static int iflinkadr __ARGS((int argc,char *argv[],void *p));
- static int ifbroad __ARGS((int argc,char *argv[],void *p));
- static int ifnetmsk __ARGS((int argc,char *argv[],void *p));
- static int ifrxbuf __ARGS((int argc,char *argv[],void *p));
- static int ifmtu __ARGS((int argc,char *argv[],void *p));
- static int ifforw __ARGS((int argc,char *argv[],void *p));
- static int ifencap __ARGS((int argc,char *argv[],void *p));
-
- /* Interface list header */
- struct iface *Ifaces = &Loopback;
-
- /* Loopback pseudo-interface */
- struct iface Loopback = {
- &Encap, /* Link to next entry */
- "loopback", /* name */
- 0x7f000001L, /* addr 127.0.0.1 */
- 0xffffffffL, /* broadcast 255.255.255.255 */
- 0xffffffffL, /* netmask 255.255.255.255 */
- MAXINT16, /* mtu No limit */
- 0, /* flags */
- 0, /* trace */
- NULLFILE, /* trfp */
- NULLIF, /* forw */
- NULLPROC, /* rxproc */
- NULLPROC, /* txproc */
- NULLPROC, /* supv */
- NULLBUF, /* outq */
- 0, /* dev */
- NULL, /* (*ioctl) */
- NULLFP, /* (*iostatus) */
- NULLFP, /* (*stop) */
- NULLCHAR, /* hwaddr */
- NULL, /* extension */
- 0, /* xdev */
- &Iftypes[0], /* iftype */
- NULLFP, /* (*send) */
- NULLFP, /* (*output) */
- NULLFP, /* (*raw) */
- NULLFP, /* (*status) */
- NULLFP, /* (*discard) */
- NULLFP, /* (*echo) */
- 0, /* ipsndcnt */
- 0, /* rawsndcnt */
- 0, /* iprecvcnt */
- 0, /* rawrcvcnt */
- 0, /* lastsent */
- 0, /* lastrecv */
- };
- /* Encapsulation pseudo-interface */
- struct iface Encap = {
- NULLIF,
- "encap", /* name */
- INADDR_ANY, /* addr 0.0.0.0 */
- 0xffffffffL, /* broadcast 255.255.255.255 */
- 0xffffffffL, /* netmask 255.255.255.255 */
- MAXINT16, /* mtu No limit */
- 0, /* flags */
- 0, /* trace */
- NULLFILE, /* trfp */
- NULLIF, /* forw */
- NULLPROC, /* rxproc */
- NULLPROC, /* txproc */
- NULLPROC, /* supv */
- NULLBUF, /* outq */
- 0, /* dev */
- NULL, /* (*ioctl) */
- NULLFP, /* (*iostatus) */
- NULLFP, /* (*stop) */
- NULLCHAR, /* hwaddr */
- NULL, /* extension */
- 0, /* xdev */
- &Iftypes[0], /* iftype */
- ip_encap, /* (*send) */
- NULLFP, /* (*output) */
- NULLFP, /* (*raw) */
- NULLFP, /* (*status) */
- NULLFP, /* (*discard) */
- NULLFP, /* (*echo) */
- 0, /* ipsndcnt */
- 0, /* rawsndcnt */
- 0, /* iprecvcnt */
- 0, /* rawrcvcnt */
- 0, /* lastsent */
- 0, /* lastrecv */
- };
-
- char Noipaddr[] = "IP address field missing, and ip address not set\n";
-
- struct cmds Ifcmds[] = {
- "broadcast", ifbroad, 0, 2, NULLCHAR,
- "encapsulation", ifencap, 0, 2, NULLCHAR,
- "forward", ifforw, 0, 2, NULLCHAR,
- "ipaddress", ifipaddr, 0, 2, NULLCHAR,
- "linkaddress", iflinkadr, 0, 2, NULLCHAR,
- "mtu", ifmtu, 0, 2, NULLCHAR,
- "netmask", ifnetmsk, 0, 2, NULLCHAR,
- "rxbuf", ifrxbuf, 0, 2, NULLCHAR,
- NULLCHAR,
- };
- /*
- * General purpose interface transmit task, one for each device that can
- * send IP datagrams. It waits on the interface's IP output queue (outq),
- * extracts IP datagrams placed there in priority order by ip_route(),
- * and sends them to the device's send routine.
- */
- void
- if_tx(dev,arg1,unused)
- int dev;
- void *arg1;
- void *unused;
- {
- struct mbuf *bp; /* Buffer to send */
- struct iface *iface; /* Pointer to interface control block */
- struct qhdr qhdr;
-
- iface = arg1;
- for(;;){
- while(iface->outq == NULLBUF)
- pwait(&iface->outq);
-
- bp = dequeue(&iface->outq);
- pullup(&bp,(char *)&qhdr,sizeof(qhdr));
- (*iface->send)(bp,iface,qhdr.gateway,qhdr.tos);
-
- /* Let other tasks run, just in case send didn't block */
- pwait(NULL);
- }
- }
- /* Process packets in the Hopper */
- void
- network(i,v1,v2)
- int i;
- void *v1;
- void *v2;
- {
- struct mbuf *bp;
- char i_state;
- struct iftype *ift;
- struct iface *ifp;
-
- loop:
- refiq(); /* Replenish interrupt buffer pool */
-
- for(;;){
- i_state = dirps();
- bp = Hopper;
- if(bp != NULLBUF){
- bp = dequeue(&Hopper);
- restore(i_state);
- break;
- }
- restore(i_state);
- pwait(&Hopper);
- }
- /* Process the input packet */
- pullup(&bp,(char *)&ifp,sizeof(ifp));
- if(ifp != NULLIF){
- ifp->rawrecvcnt++;
- ifp->lastrecv = secclock();
- ift = ifp->iftype;
- } else {
- ift = &Iftypes[0];
- }
- dump(ifp,IF_TRACE_IN,bp);
-
- if(ift->rcvf != NULLVFP)
- (*ift->rcvf)(ifp,bp);
- else
- free_p(bp); /* Nowhere to send it */
- /* Let everything else run - this keeps the system from wedging
- * when we're hit by a big burst of packets
- */
- pwait(NULL);
- goto loop;
- }
-
- /* put mbuf into Hopper for network task
- * returns 0 if OK
- */
- int
- net_route(ifp,bp)
- struct iface *ifp;
- struct mbuf *bp;
- {
- bp = pushdown(bp,sizeof(ifp));
- memcpy(&bp->data[0],(char *)&ifp,sizeof(ifp));
- enqueue(&Hopper,bp);
- return 0;
- }
-
- /* Set interface parameters */
- int
- doifconfig(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- struct iface *ifp;
- int i;
-
- if(argc < 2){
- for(ifp = Ifaces;ifp != NULLIF;ifp = ifp->next)
- showiface(ifp);
- return 0;
- }
- if((ifp = if_lookup(argv[1])) == NULLIF){
- printf("Interface %s unknown\n",argv[1]);
- return 1;
- }
- if(argc == 2){
- showiface(ifp);
- if(ifp->show != NULLVFP){
- (*ifp->show)(ifp);
- }
- return 0;
- }
- if(argc == 3){
- printf("Argument missing\n");
- return 1;
- }
- for(i=2;i<argc-1;i+=2)
- subcmd(Ifcmds,3,&argv[i-1],ifp);
-
- return 0;
- }
-
- /* Set interface IP address */
- static int
- ifipaddr(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- struct iface *ifp = p;
-
- ifp->addr = resolve(argv[1]);
- return 0;
- }
-
-
- /* Set link (hardware) address */
- static int
- iflinkadr(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- struct iface *ifp = p;
-
- if(ifp->iftype == NULLIFT || ifp->iftype->scan == NULL){
- printf("Can't set link address\n");
- return 1;
- }
- if(ifp->hwaddr != NULLCHAR)
- free(ifp->hwaddr);
- ifp->hwaddr = mallocw(ifp->iftype->hwalen);
- (*ifp->iftype->scan)(ifp->hwaddr,argv[1]);
- return 0;
- }
-
- /* Set interface broadcast address. This is actually done
- * by installing a private entry in the routing table.
- */
- static int
- ifbroad(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- struct iface *ifp = p;
- struct route *rp;
-
- rp = rt_blookup(ifp->broadcast,32);
- if(rp != NULLROUTE && rp->iface == ifp)
- rt_drop(ifp->broadcast,32);
- ifp->broadcast = resolve(argv[1]);
- rt_add(ifp->broadcast,32,0L,ifp,1L,0L,1);
- return 0;
- }
-
- /* Set the network mask. This is actually done by installing
- * a routing entry.
- */
- static int
- ifnetmsk(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- struct iface *ifp = p;
- struct route *rp;
-
- /* Remove old entry if it exists */
- rp = rt_blookup(ifp->addr & ifp->netmask,mask2width(ifp->netmask));
- if(rp != NULLROUTE)
- rt_drop(rp->target,rp->bits);
-
- ifp->netmask = htol(argv[1]);
- rt_add(ifp->addr,mask2width(ifp->netmask),0L,ifp,0L,0L,0);
- return 0;
- }
-
- /* Command to set interface encapsulation mode */
- static int
- ifencap(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- struct iface *ifp = p;
-
- if(setencap(ifp,argv[1]) != 0){
- printf("Encapsulation mode '%s' unknown\n",argv[1]);
- return 1;
- }
- return 0;
- }
- /* Function to set encapsulation mode */
- int
- setencap(ifp,mode)
- struct iface *ifp;
- char *mode;
- {
- struct iftype *ift;
-
- for(ift = &Iftypes[0];ift->name != NULLCHAR;ift++)
- if(strnicmp(ift->name,mode,strlen(mode)) == 0)
- break;
- if(ift->name == NULLCHAR){
- return -1;
- }
- ifp->iftype = ift;
- ifp->send = ift->send;
- ifp->output = ift->output;
- return 0;
- }
- /* Set interface receive buffer size */
- static int
- ifrxbuf(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- return 0; /* To be written */
- }
-
- /* Set interface Maximum Transmission Unit */
- static int
- ifmtu(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- struct iface *ifp = p;
-
- ifp->mtu = atoi(argv[1]);
- return 0;
- }
-
- /* Set interface forwarding */
- static int
- ifforw(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- struct iface *ifp = p;
-
- ifp->forw = if_lookup(argv[1]);
- if(ifp->forw == ifp)
- ifp->forw = NULLIF;
- return 0;
- }
-
- /* Display the parameters for a specified interface */
- static void
- showiface(ifp)
- register struct iface *ifp;
- {
- char tmp[25];
-
- printf("%-10s IP addr %s MTU %u Link encap ",ifp->name,
- inet_ntoa(ifp->addr),(int)ifp->mtu);
- if(ifp->iftype == NULLIFT){
- printf("not set\n");
- } else {
- printf("%s\n",ifp->iftype->name);
- if(ifp->iftype->format != NULL && ifp->hwaddr != NULLCHAR)
- printf(" Link addr %s\n",
- (*ifp->iftype->format)(tmp,ifp->hwaddr));
- }
- printf(" flags %u trace 0x%x netmask 0x%08lx broadcast %s\n",
- ifp->flags,ifp->trace,ifp->netmask,inet_ntoa(ifp->broadcast));
- if(ifp->forw != NULLIF)
- printf(" output forward to %s\n",ifp->forw->name);
- printf(" sent: ip %lu tot %lu idle %s qlen %d\n",
- ifp->ipsndcnt,ifp->rawsndcnt,tformat(secclock() - ifp->lastsent),
- len_q(ifp->outq));
- printf(" recv: ip %lu tot %lu idle %s\n",
- ifp->iprecvcnt,ifp->rawrecvcnt,tformat(secclock() - ifp->lastrecv));
- }
-
- /* Command to detach an interface */
- int
- dodetach(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- register struct iface *ifp;
-
- if((ifp = if_lookup(argv[1])) == NULLIF){
- printf("Interface %s unknown\n",argv[1]);
- return 1;
- }
- if(if_detach(ifp) == -1)
- printf("Can't detach loopback or encap interface\n");
- return 0;
- }
- /* Detach a specified interface */
- int
- if_detach(ifp)
- register struct iface *ifp;
- {
- struct iface *iftmp;
- struct route *rp,*rptmp;
- int i,j;
-
- if(ifp == &Loopback || ifp == &Encap)
- return -1;
-
- /* Drop all routes that point to this interface */
- if(R_default.iface == ifp)
- rt_drop(0L,0); /* Drop default route */
-
- for(i=0;i<HASHMOD;i++){
- for(j=0;j<32;j++){
- for(rp = Routes[j][i];rp != NULLROUTE;rp = rptmp){
- /* Save next pointer in case we delete this entry */
- rptmp = rp->next;
- if(rp->iface == ifp)
- rt_drop(rp->target,rp->bits);
- }
- }
- }
- /* Unforward any other interfaces forwarding to this one */
- for(iftmp = Ifaces;iftmp != NULLIF;iftmp = iftmp->next){
- if(iftmp->forw == ifp)
- iftmp->forw = NULLIF;
- }
- /* Call device shutdown routine, if any */
- if(ifp->stop != NULLFP)
- (*ifp->stop)(ifp);
-
- killproc(ifp->rxproc);
- killproc(ifp->txproc);
- killproc(ifp->supv);
-
- /* Free allocated memory associated with this interface */
- if(ifp->name != NULLCHAR)
- free(ifp->name);
- if(ifp->hwaddr != NULLCHAR)
- free(ifp->hwaddr);
- /* Remove from interface list */
- if(ifp == Ifaces){
- Ifaces = ifp->next;
- } else {
- /* Search for entry just before this one
- * (necessary because list is only singly-linked.)
- */
- for(iftmp = Ifaces;iftmp != NULLIF ;iftmp = iftmp->next)
- if(iftmp->next == ifp)
- break;
- if(iftmp != NULLIF && iftmp->next == ifp)
- iftmp->next = ifp->next;
- }
- /* Finally free the structure itself */
- free((char *)ifp);
- return 0;
- }
-
- /* Given the ascii name of an interface, return a pointer to the structure,
- * or NULLIF if it doesn't exist
- */
- struct iface *
- if_lookup(name)
- char *name;
- {
- register struct iface *ifp;
-
- for(ifp = Ifaces; ifp != NULLIF; ifp = ifp->next)
- if(strcmp(ifp->name,name) == 0)
- break;
- return ifp;
- }
-
- /* Return iface pointer if 'addr' belongs to one of our interfaces,
- * NULLIF otherwise.
- * This is used to tell if an incoming IP datagram is for us, or if it
- * has to be routed.
- */
- struct iface *
- ismyaddr(addr)
- int32 addr;
- {
- register struct iface *ifp;
-
- for(ifp = Ifaces; ifp != NULLIF; ifp = ifp->next)
- if(addr == ifp->addr)
- break;
- return ifp;
- }
-
- /* Given a network mask, return the number of contiguous 1-bits starting
- * from the most significant bit.
- */
- static int
- mask2width(mask)
- int32 mask;
- {
- int width,i;
-
- width = 0;
- for(i = 31;i >= 0;i--){
- if(!(mask & (1L << i)))
- break;
- width++;
- }
- return width;
- }
-
- /* return buffer with name + comment */
- char *
- if_name(ifp,comment)
- struct iface *ifp;
- char *comment;
- {
- char *result;
-
- result = mallocw(strlen(ifp->name) + strlen(comment) + 1);
- strcpy(result,ifp->name);
- strcat(result,comment);
- return result;
- }
-
- /* Raw output routine that tosses all packets. Used by dialer, tip, etc */
- int
- bitbucket(ifp,bp)
- struct iface *ifp;
- struct mbuf *bp;
- {
- free_p(bp);
- return 0;
- }
-