The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/netgraph/ng_sppp.c

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    1 /*
    2  * ng_sppp.c Netgraph to Sppp module.
    3  */
    4 
    5 /*-
    6  * Copyright (C) 2002-2004 Cronyx Engineering.
    7  * Copyright (C) 2002-2004 Roman Kurakin <rik@cronyx.ru>
    8  *
    9  * This software is distributed with NO WARRANTIES, not even the implied
   10  * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   11  *
   12  * Authors grant any other persons or organisations a permission to use,
   13  * modify and redistribute this software in source and binary forms,
   14  * as long as this message is kept with the software, all derivative
   15  * works or modified versions.
   16  *
   17  * Cronyx Id: ng_sppp.c,v 1.1.2.10 2004/03/01 15:17:21 rik Exp $
   18  */
   19 #include <sys/cdefs.h>
   20 __FBSDID("$FreeBSD: releng/7.4/sys/netgraph/ng_sppp.c 165632 2006-12-29 13:59:50Z jhb $");
   21 
   22 #include <sys/param.h>
   23 #include <sys/systm.h>
   24 #include <sys/errno.h>
   25 #include <sys/kernel.h>
   26 #include <sys/malloc.h>
   27 #include <sys/mbuf.h>
   28 #include <sys/errno.h>
   29 #include <sys/sockio.h>
   30 #include <sys/socket.h>
   31 #include <sys/syslog.h>
   32 #include <sys/libkern.h>
   33 
   34 #include <net/if.h>
   35 #include <net/if_types.h>
   36 #include <net/bpf.h>
   37 #include <net/if_sppp.h>
   38 
   39 #include <netinet/in.h>
   40 
   41 #include <netgraph/ng_message.h>
   42 #include <netgraph/netgraph.h>
   43 #include <netgraph/ng_parse.h>
   44 #include <netgraph/ng_sppp.h>
   45 
   46 #ifdef NG_SEPARATE_MALLOC
   47 MALLOC_DEFINE(M_NETGRAPH_SPPP, "netgraph_sppp", "netgraph sppp node ");
   48 #else
   49 #define M_NETGRAPH_SPPP M_NETGRAPH
   50 #endif
   51 
   52 /* Node private data */
   53 struct ng_sppp_private {
   54         struct  ifnet *ifp;             /* Our interface */
   55         int     unit;                   /* Interface unit number */
   56         node_p  node;                   /* Our netgraph node */
   57         hook_p  hook;                   /* Hook */
   58 };
   59 typedef struct ng_sppp_private *priv_p;
   60 
   61 /* Interface methods */
   62 static void     ng_sppp_start (struct ifnet *ifp);
   63 static int      ng_sppp_ioctl (struct ifnet *ifp, u_long cmd, caddr_t data);
   64 
   65 /* Netgraph methods */
   66 static ng_constructor_t ng_sppp_constructor;
   67 static ng_rcvmsg_t      ng_sppp_rcvmsg;
   68 static ng_shutdown_t    ng_sppp_shutdown;
   69 static ng_newhook_t     ng_sppp_newhook;
   70 static ng_rcvdata_t     ng_sppp_rcvdata;
   71 static ng_disconnect_t  ng_sppp_disconnect;
   72 
   73 /* List of commands and how to convert arguments to/from ASCII */
   74 static const struct ng_cmdlist ng_sppp_cmds[] = {
   75         {
   76           NGM_SPPP_COOKIE,
   77           NGM_SPPP_GET_IFNAME,
   78           "getifname",
   79           NULL,
   80           &ng_parse_string_type
   81         },
   82         { 0 }
   83 };
   84 
   85 /* Node type descriptor */
   86 static struct ng_type typestruct = {
   87         .version =      NG_ABI_VERSION,
   88         .name =         NG_SPPP_NODE_TYPE,
   89         .constructor =  ng_sppp_constructor,
   90         .rcvmsg =       ng_sppp_rcvmsg,
   91         .shutdown =     ng_sppp_shutdown,
   92         .newhook =      ng_sppp_newhook,
   93         .rcvdata =      ng_sppp_rcvdata,
   94         .disconnect =   ng_sppp_disconnect,
   95         .cmdlist =      ng_sppp_cmds,
   96 };
   97 NETGRAPH_INIT(sppp, &typestruct);
   98 
   99 MODULE_DEPEND (ng_sppp, sppp, 1, 1, 1);
  100 
  101 /* We keep a bitmap indicating which unit numbers are free.
  102    Zero means the unit number is free, one means it's taken. */
  103 static unsigned char    *ng_sppp_units = NULL;
  104 static unsigned char    ng_sppp_units_len = 0;
  105 static unsigned char    ng_units_in_use = 0;
  106 
  107 /*
  108  * Find the first free unit number for a new interface.
  109  * Increase the size of the unit bitmap as necessary.
  110  */
  111 static __inline int
  112 ng_sppp_get_unit (int *unit)
  113 {
  114         int index, bit;
  115         unsigned char mask;
  116 
  117         for (index = 0; index < ng_sppp_units_len
  118             && ng_sppp_units[index] == 0xFF; index++);
  119         if (index == ng_sppp_units_len) {               /* extend array */
  120                 unsigned char *newarray;
  121                 int newlen;
  122                 
  123                 newlen = (2 * ng_sppp_units_len) + sizeof (*ng_sppp_units);
  124                 MALLOC (newarray, unsigned char *,
  125                     newlen * sizeof (*ng_sppp_units), M_NETGRAPH_SPPP, M_NOWAIT);
  126                 if (newarray == NULL)
  127                         return (ENOMEM);
  128                 bcopy (ng_sppp_units, newarray,
  129                     ng_sppp_units_len * sizeof (*ng_sppp_units));
  130                 bzero (newarray + ng_sppp_units_len,
  131                     newlen - ng_sppp_units_len);
  132                 if (ng_sppp_units != NULL)
  133                         FREE (ng_sppp_units, M_NETGRAPH_SPPP);
  134                 ng_sppp_units = newarray;
  135                 ng_sppp_units_len = newlen;
  136         }
  137         mask = ng_sppp_units[index];
  138         for (bit = 0; (mask & 1) != 0; bit++)
  139                 mask >>= 1;
  140         KASSERT ((bit >= 0 && bit < NBBY),
  141             ("%s: word=%d bit=%d", __func__, ng_sppp_units[index], bit));
  142         ng_sppp_units[index] |= (1 << bit);
  143         *unit = (index * NBBY) + bit;
  144         ng_units_in_use++;
  145         return (0);
  146 }
  147 
  148 /*
  149  * Free a no longer needed unit number.
  150  */
  151 static __inline void
  152 ng_sppp_free_unit (int unit)
  153 {
  154         int index, bit;
  155 
  156         index = unit / NBBY;
  157         bit = unit % NBBY;
  158         KASSERT (index < ng_sppp_units_len,
  159             ("%s: unit=%d len=%d", __func__, unit, ng_sppp_units_len));
  160         KASSERT ((ng_sppp_units[index] & (1 << bit)) != 0,
  161             ("%s: unit=%d is free", __func__, unit));
  162         ng_sppp_units[index] &= ~(1 << bit);
  163 
  164         ng_units_in_use--;
  165         if (ng_units_in_use == 0) {
  166                 FREE (ng_sppp_units, M_NETGRAPH_SPPP);
  167                 ng_sppp_units_len = 0;
  168                 ng_sppp_units = NULL;
  169         }
  170 }
  171 
  172 /************************************************************************
  173                         INTERFACE STUFF
  174  ************************************************************************/
  175 
  176 /*
  177  * Process an ioctl for the interface
  178  */
  179 static int
  180 ng_sppp_ioctl (struct ifnet *ifp, u_long command, caddr_t data)
  181 {
  182         int error = 0;
  183 
  184         error = sppp_ioctl (ifp, command, data);
  185         if (error)
  186                 return error;
  187 
  188         return error;
  189 }
  190 
  191 /*
  192  * This routine should never be called
  193  */
  194 
  195 static void
  196 ng_sppp_start (struct ifnet *ifp)
  197 {
  198         struct mbuf *m;
  199         int len, error = 0;
  200         priv_p priv = ifp->if_softc;
  201         
  202         /* Check interface flags */
  203         /*
  204          * This has side effects. It is not good idea to stop sending if we
  205          * are not UP. If we are not running we still want to send LCP term
  206          * packets.
  207          */
  208 /*      if (!((ifp->if_flags & IFF_UP) && */
  209 /*          (ifp->if_drv_flags & IFF_DRV_RUNNING))) { */
  210 /*              return;*/
  211 /*      }*/
  212         
  213         if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
  214                 return;
  215                 
  216         if (!priv->hook)
  217                 return;
  218                 
  219         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  220 
  221         while ((m = sppp_dequeue (ifp)) != NULL) {
  222                 BPF_MTAP (ifp, m);
  223                 len = m->m_pkthdr.len;
  224                 
  225                 NG_SEND_DATA_ONLY (error, priv->hook, m);
  226                 
  227                 if (error) {
  228                         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  229                         return;
  230                 }
  231         }
  232         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  233 }
  234 
  235 /************************************************************************
  236                         NETGRAPH NODE STUFF
  237  ************************************************************************/
  238 
  239 /*
  240  * Constructor for a node
  241  */
  242 static int
  243 ng_sppp_constructor (node_p node)
  244 {
  245         struct sppp *pp;
  246         struct ifnet *ifp;
  247         priv_p priv;
  248         int error = 0;
  249 
  250         /* Allocate node and interface private structures */
  251         MALLOC (priv, priv_p, sizeof(*priv), M_NETGRAPH_SPPP, M_NOWAIT|M_ZERO);
  252         if (priv == NULL)
  253                 return (ENOMEM);
  254 
  255         ifp = if_alloc(IFT_PPP);
  256         if (ifp == NULL) {
  257                 FREE (priv, M_NETGRAPH_SPPP);
  258                 return (ENOSPC);
  259         }
  260         pp = IFP2SP(ifp);
  261 
  262         /* Link them together */
  263         ifp->if_softc = priv;
  264         priv->ifp = ifp;
  265 
  266         /* Get an interface unit number */
  267         if ((error = ng_sppp_get_unit(&priv->unit)) != 0) {
  268                 FREE (pp, M_NETGRAPH_SPPP);
  269                 FREE (priv, M_NETGRAPH_SPPP);
  270                 return (error);
  271         }
  272 
  273 
  274         /* Link together node and private info */
  275         NG_NODE_SET_PRIVATE (node, priv);
  276         priv->node = node;
  277 
  278         /* Initialize interface structure */
  279         if_initname (SP2IFP(pp), NG_SPPP_IFACE_NAME, priv->unit);
  280         ifp->if_start = ng_sppp_start;
  281         ifp->if_ioctl = ng_sppp_ioctl;
  282         ifp->if_watchdog = NULL;
  283         ifp->if_flags = (IFF_POINTOPOINT|IFF_MULTICAST);
  284 
  285         /* Give this node the same name as the interface (if possible) */
  286         if (ng_name_node(node, SP2IFP(pp)->if_xname) != 0)
  287                 log (LOG_WARNING, "%s: can't acquire netgraph name\n",
  288                     SP2IFP(pp)->if_xname);
  289 
  290         /* Attach the interface */
  291         sppp_attach (ifp);
  292         if_attach (ifp);
  293         bpfattach (ifp, DLT_NULL, sizeof(u_int32_t));
  294 
  295         /* Done */
  296         return (0);
  297 }
  298 
  299 /*
  300  * Give our ok for a hook to be added
  301  */
  302 static int
  303 ng_sppp_newhook (node_p node, hook_p hook, const char *name)
  304 {
  305         priv_p priv = NG_NODE_PRIVATE (node);
  306 
  307         if (strcmp (name, NG_SPPP_HOOK_DOWNSTREAM) != 0)
  308                 return (EINVAL);
  309         
  310         if (priv->hook)
  311                 return (EISCONN);
  312                 
  313         priv->hook = hook;
  314         NG_HOOK_SET_PRIVATE (hook, priv);
  315         
  316         return (0);
  317 }
  318 
  319 /*
  320  * Receive a control message
  321  */
  322 static int
  323 ng_sppp_rcvmsg (node_p node, item_p item, hook_p lasthook)
  324 {
  325         const priv_p priv = NG_NODE_PRIVATE (node);
  326         struct ng_mesg *msg = NULL;
  327         struct ng_mesg *resp = NULL;
  328         struct sppp *const pp = IFP2SP(priv->ifp);
  329         int error = 0;
  330 
  331         NGI_GET_MSG (item, msg);
  332         switch (msg->header.typecookie) {
  333         case NGM_SPPP_COOKIE:
  334                 switch (msg->header.cmd) {
  335                 case NGM_SPPP_GET_IFNAME:
  336                         NG_MKRESPONSE (resp, msg, IFNAMSIZ, M_NOWAIT);
  337                         if (!resp) {
  338                                 error = ENOMEM;
  339                                 break;
  340                         }
  341                         strlcpy(resp->data, SP2IFP(pp)->if_xname, IFNAMSIZ);
  342                         break;
  343 
  344                 default:
  345                         error = EINVAL;
  346                         break;
  347                 }
  348                 break;
  349         default:
  350                 error = EINVAL;
  351                 break;
  352         }
  353         NG_RESPOND_MSG (error, node, item, resp);
  354         NG_FREE_MSG (msg);
  355         return (error);
  356 }
  357 
  358 /*
  359  * Recive data from a hook. Pass the packet to the correct input routine.
  360  */
  361 static int
  362 ng_sppp_rcvdata (hook_p hook, item_p item)
  363 {
  364         struct mbuf *m;
  365         const priv_p priv = NG_NODE_PRIVATE (NG_HOOK_NODE (hook));
  366         struct sppp *const pp = IFP2SP(priv->ifp);
  367 
  368         NGI_GET_M (item, m);
  369         NG_FREE_ITEM (item);
  370         /* Sanity checks */
  371         KASSERT (m->m_flags & M_PKTHDR, ("%s: not pkthdr", __func__));
  372         if ((SP2IFP(pp)->if_flags & IFF_UP) == 0) {
  373                 NG_FREE_M (m);
  374                 return (ENETDOWN);
  375         }
  376 
  377         /* Update interface stats */
  378         SP2IFP(pp)->if_ipackets++;
  379 
  380         /* Note receiving interface */
  381         m->m_pkthdr.rcvif = SP2IFP(pp);
  382 
  383         /* Berkeley packet filter */
  384         BPF_MTAP (SP2IFP(pp), m);
  385 
  386         /* Send packet */
  387         sppp_input (SP2IFP(pp), m);
  388         return 0;
  389 }
  390 
  391 /*
  392  * Shutdown and remove the node and its associated interface.
  393  */
  394 static int
  395 ng_sppp_shutdown (node_p node)
  396 {
  397         const priv_p priv = NG_NODE_PRIVATE(node);
  398         /* Detach from the packet filter list of interfaces. */
  399         bpfdetach (priv->ifp);
  400         sppp_detach (priv->ifp);
  401         if_detach (priv->ifp);
  402         if_free(priv->ifp);
  403         ng_sppp_free_unit (priv->unit);
  404         FREE (priv, M_NETGRAPH_SPPP);
  405         NG_NODE_SET_PRIVATE (node, NULL);
  406         NG_NODE_UNREF (node);
  407         return (0);
  408 }
  409 
  410 /*
  411  * Hook disconnection.
  412  */
  413 static int
  414 ng_sppp_disconnect (hook_p hook)
  415 {
  416         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  417 
  418         if (priv)
  419                 priv->hook = NULL;
  420 
  421         return (0);
  422 }

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