The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
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: stable/12/sys/netgraph/ng_sppp.c 271851 2014-09-19 05:03:11Z glebius $");
   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_var.h>
   36 #include <net/if_types.h>
   37 #include <net/bpf.h>
   38 #include <net/if_sppp.h>
   39 
   40 #include <netinet/in.h>
   41 
   42 #include <netgraph/ng_message.h>
   43 #include <netgraph/netgraph.h>
   44 #include <netgraph/ng_parse.h>
   45 #include <netgraph/ng_sppp.h>
   46 
   47 #ifdef NG_SEPARATE_MALLOC
   48 static MALLOC_DEFINE(M_NETGRAPH_SPPP, "netgraph_sppp", "netgraph sppp node");
   49 #else
   50 #define M_NETGRAPH_SPPP M_NETGRAPH
   51 #endif
   52 
   53 /* Node private data */
   54 struct ng_sppp_private {
   55         struct  ifnet *ifp;             /* Our interface */
   56         int     unit;                   /* Interface unit number */
   57         node_p  node;                   /* Our netgraph node */
   58         hook_p  hook;                   /* Hook */
   59 };
   60 typedef struct ng_sppp_private *priv_p;
   61 
   62 /* Interface methods */
   63 static void     ng_sppp_start (struct ifnet *ifp);
   64 static int      ng_sppp_ioctl (struct ifnet *ifp, u_long cmd, caddr_t data);
   65 
   66 /* Netgraph methods */
   67 static ng_constructor_t ng_sppp_constructor;
   68 static ng_rcvmsg_t      ng_sppp_rcvmsg;
   69 static ng_shutdown_t    ng_sppp_shutdown;
   70 static ng_newhook_t     ng_sppp_newhook;
   71 static ng_rcvdata_t     ng_sppp_rcvdata;
   72 static ng_disconnect_t  ng_sppp_disconnect;
   73 
   74 /* List of commands and how to convert arguments to/from ASCII */
   75 static const struct ng_cmdlist ng_sppp_cmds[] = {
   76         {
   77           NGM_SPPP_COOKIE,
   78           NGM_SPPP_GET_IFNAME,
   79           "getifname",
   80           NULL,
   81           &ng_parse_string_type
   82         },
   83         { 0 }
   84 };
   85 
   86 /* Node type descriptor */
   87 static struct ng_type typestruct = {
   88         .version =      NG_ABI_VERSION,
   89         .name =         NG_SPPP_NODE_TYPE,
   90         .constructor =  ng_sppp_constructor,
   91         .rcvmsg =       ng_sppp_rcvmsg,
   92         .shutdown =     ng_sppp_shutdown,
   93         .newhook =      ng_sppp_newhook,
   94         .rcvdata =      ng_sppp_rcvdata,
   95         .disconnect =   ng_sppp_disconnect,
   96         .cmdlist =      ng_sppp_cmds,
   97 };
   98 NETGRAPH_INIT(sppp, &typestruct);
   99 
  100 MODULE_DEPEND (ng_sppp, sppp, 1, 1, 1);
  101 
  102 /* We keep a bitmap indicating which unit numbers are free.
  103    Zero means the unit number is free, one means it's taken. */
  104 static unsigned char    *ng_sppp_units = NULL;
  105 static unsigned char    ng_sppp_units_len = 0;
  106 static unsigned char    ng_units_in_use = 0;
  107 
  108 /*
  109  * Find the first free unit number for a new interface.
  110  * Increase the size of the unit bitmap as necessary.
  111  */
  112 static __inline void
  113 ng_sppp_get_unit (int *unit)
  114 {
  115         int index, bit;
  116         unsigned char mask;
  117 
  118         for (index = 0; index < ng_sppp_units_len
  119             && ng_sppp_units[index] == 0xFF; index++);
  120         if (index == ng_sppp_units_len) {               /* extend array */
  121                 unsigned char *newarray;
  122                 int newlen;
  123                 
  124                 newlen = (2 * ng_sppp_units_len) + sizeof (*ng_sppp_units);
  125                 newarray = malloc (newlen * sizeof (*ng_sppp_units),
  126                     M_NETGRAPH_SPPP, M_WAITOK);
  127                 bcopy (ng_sppp_units, newarray,
  128                     ng_sppp_units_len * sizeof (*ng_sppp_units));
  129                 bzero (newarray + ng_sppp_units_len,
  130                     newlen - ng_sppp_units_len);
  131                 if (ng_sppp_units != NULL)
  132                         free (ng_sppp_units, M_NETGRAPH_SPPP);
  133                 ng_sppp_units = newarray;
  134                 ng_sppp_units_len = newlen;
  135         }
  136         mask = ng_sppp_units[index];
  137         for (bit = 0; (mask & 1) != 0; bit++)
  138                 mask >>= 1;
  139         KASSERT ((bit >= 0 && bit < NBBY),
  140             ("%s: word=%d bit=%d", __func__, ng_sppp_units[index], bit));
  141         ng_sppp_units[index] |= (1 << bit);
  142         *unit = (index * NBBY) + bit;
  143         ng_units_in_use++;
  144 }
  145 
  146 /*
  147  * Free a no longer needed unit number.
  148  */
  149 static __inline void
  150 ng_sppp_free_unit (int unit)
  151 {
  152         int index, bit;
  153 
  154         index = unit / NBBY;
  155         bit = unit % NBBY;
  156         KASSERT (index < ng_sppp_units_len,
  157             ("%s: unit=%d len=%d", __func__, unit, ng_sppp_units_len));
  158         KASSERT ((ng_sppp_units[index] & (1 << bit)) != 0,
  159             ("%s: unit=%d is free", __func__, unit));
  160         ng_sppp_units[index] &= ~(1 << bit);
  161 
  162         ng_units_in_use--;
  163         if (ng_units_in_use == 0) {
  164                 free (ng_sppp_units, M_NETGRAPH_SPPP);
  165                 ng_sppp_units_len = 0;
  166                 ng_sppp_units = NULL;
  167         }
  168 }
  169 
  170 /************************************************************************
  171                         INTERFACE STUFF
  172  ************************************************************************/
  173 
  174 /*
  175  * Process an ioctl for the interface
  176  */
  177 static int
  178 ng_sppp_ioctl (struct ifnet *ifp, u_long command, caddr_t data)
  179 {
  180         int error = 0;
  181 
  182         error = sppp_ioctl (ifp, command, data);
  183         if (error)
  184                 return error;
  185 
  186         return error;
  187 }
  188 
  189 /*
  190  * This routine should never be called
  191  */
  192 
  193 static void
  194 ng_sppp_start (struct ifnet *ifp)
  195 {
  196         struct mbuf *m;
  197         int len, error = 0;
  198         priv_p priv = ifp->if_softc;
  199         
  200         /* Check interface flags */
  201         /*
  202          * This has side effects. It is not good idea to stop sending if we
  203          * are not UP. If we are not running we still want to send LCP term
  204          * packets.
  205          */
  206 /*      if (!((ifp->if_flags & IFF_UP) && */
  207 /*          (ifp->if_drv_flags & IFF_DRV_RUNNING))) { */
  208 /*              return;*/
  209 /*      }*/
  210         
  211         if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
  212                 return;
  213                 
  214         if (!priv->hook)
  215                 return;
  216                 
  217         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  218 
  219         while ((m = sppp_dequeue (ifp)) != NULL) {
  220                 BPF_MTAP (ifp, m);
  221                 len = m->m_pkthdr.len;
  222                 
  223                 NG_SEND_DATA_ONLY (error, priv->hook, m);
  224                 
  225                 if (error) {
  226                         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  227                         return;
  228                 }
  229         }
  230         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  231 }
  232 
  233 /************************************************************************
  234                         NETGRAPH NODE STUFF
  235  ************************************************************************/
  236 
  237 /*
  238  * Constructor for a node
  239  */
  240 static int
  241 ng_sppp_constructor (node_p node)
  242 {
  243         struct sppp *pp;
  244         struct ifnet *ifp;
  245         priv_p priv;
  246 
  247         /* Allocate node and interface private structures */
  248         priv = malloc(sizeof(*priv), M_NETGRAPH_SPPP, M_WAITOK | M_ZERO);
  249 
  250         ifp = if_alloc(IFT_PPP);
  251         if (ifp == NULL) {
  252                 free (priv, M_NETGRAPH_SPPP);
  253                 return (ENOSPC);
  254         }
  255         pp = IFP2SP(ifp);
  256 
  257         /* Link them together */
  258         ifp->if_softc = priv;
  259         priv->ifp = ifp;
  260 
  261         /* Get an interface unit number */
  262         ng_sppp_get_unit(&priv->unit);
  263 
  264         /* Link together node and private info */
  265         NG_NODE_SET_PRIVATE (node, priv);
  266         priv->node = node;
  267 
  268         /* Initialize interface structure */
  269         if_initname (SP2IFP(pp), NG_SPPP_IFACE_NAME, priv->unit);
  270         ifp->if_start = ng_sppp_start;
  271         ifp->if_ioctl = ng_sppp_ioctl;
  272         ifp->if_flags = (IFF_POINTOPOINT|IFF_MULTICAST);
  273 
  274         /* Give this node the same name as the interface (if possible) */
  275         if (ng_name_node(node, SP2IFP(pp)->if_xname) != 0)
  276                 log (LOG_WARNING, "%s: can't acquire netgraph name\n",
  277                     SP2IFP(pp)->if_xname);
  278 
  279         /* Attach the interface */
  280         sppp_attach (ifp);
  281         if_attach (ifp);
  282         bpfattach (ifp, DLT_NULL, sizeof(u_int32_t));
  283 
  284         /* Done */
  285         return (0);
  286 }
  287 
  288 /*
  289  * Give our ok for a hook to be added
  290  */
  291 static int
  292 ng_sppp_newhook (node_p node, hook_p hook, const char *name)
  293 {
  294         priv_p priv = NG_NODE_PRIVATE (node);
  295 
  296         if (strcmp (name, NG_SPPP_HOOK_DOWNSTREAM) != 0)
  297                 return (EINVAL);
  298         
  299         if (priv->hook)
  300                 return (EISCONN);
  301                 
  302         priv->hook = hook;
  303         NG_HOOK_SET_PRIVATE (hook, priv);
  304         
  305         return (0);
  306 }
  307 
  308 /*
  309  * Receive a control message
  310  */
  311 static int
  312 ng_sppp_rcvmsg (node_p node, item_p item, hook_p lasthook)
  313 {
  314         const priv_p priv = NG_NODE_PRIVATE (node);
  315         struct ng_mesg *msg = NULL;
  316         struct ng_mesg *resp = NULL;
  317         struct sppp *const pp = IFP2SP(priv->ifp);
  318         int error = 0;
  319 
  320         NGI_GET_MSG (item, msg);
  321         switch (msg->header.typecookie) {
  322         case NGM_SPPP_COOKIE:
  323                 switch (msg->header.cmd) {
  324                 case NGM_SPPP_GET_IFNAME:
  325                         NG_MKRESPONSE (resp, msg, IFNAMSIZ, M_NOWAIT);
  326                         if (!resp) {
  327                                 error = ENOMEM;
  328                                 break;
  329                         }
  330                         strlcpy(resp->data, SP2IFP(pp)->if_xname, IFNAMSIZ);
  331                         break;
  332 
  333                 default:
  334                         error = EINVAL;
  335                         break;
  336                 }
  337                 break;
  338         default:
  339                 error = EINVAL;
  340                 break;
  341         }
  342         NG_RESPOND_MSG (error, node, item, resp);
  343         NG_FREE_MSG (msg);
  344         return (error);
  345 }
  346 
  347 /*
  348  * Recive data from a hook. Pass the packet to the correct input routine.
  349  */
  350 static int
  351 ng_sppp_rcvdata (hook_p hook, item_p item)
  352 {
  353         struct mbuf *m;
  354         const priv_p priv = NG_NODE_PRIVATE (NG_HOOK_NODE (hook));
  355         struct sppp *const pp = IFP2SP(priv->ifp);
  356 
  357         NGI_GET_M (item, m);
  358         NG_FREE_ITEM (item);
  359         /* Sanity checks */
  360         KASSERT (m->m_flags & M_PKTHDR, ("%s: not pkthdr", __func__));
  361         if ((SP2IFP(pp)->if_flags & IFF_UP) == 0) {
  362                 NG_FREE_M (m);
  363                 return (ENETDOWN);
  364         }
  365 
  366         /* Update interface stats */
  367         if_inc_counter(SP2IFP(pp), IFCOUNTER_IPACKETS, 1);
  368 
  369         /* Note receiving interface */
  370         m->m_pkthdr.rcvif = SP2IFP(pp);
  371 
  372         /* Berkeley packet filter */
  373         BPF_MTAP (SP2IFP(pp), m);
  374 
  375         /* Send packet */
  376         sppp_input (SP2IFP(pp), m);
  377         return 0;
  378 }
  379 
  380 /*
  381  * Shutdown and remove the node and its associated interface.
  382  */
  383 static int
  384 ng_sppp_shutdown (node_p node)
  385 {
  386         const priv_p priv = NG_NODE_PRIVATE(node);
  387         /* Detach from the packet filter list of interfaces. */
  388         bpfdetach (priv->ifp);
  389         sppp_detach (priv->ifp);
  390         if_detach (priv->ifp);
  391         if_free(priv->ifp);
  392         ng_sppp_free_unit (priv->unit);
  393         free (priv, M_NETGRAPH_SPPP);
  394         NG_NODE_SET_PRIVATE (node, NULL);
  395         NG_NODE_UNREF (node);
  396         return (0);
  397 }
  398 
  399 /*
  400  * Hook disconnection.
  401  */
  402 static int
  403 ng_sppp_disconnect (hook_p hook)
  404 {
  405         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  406 
  407         if (priv)
  408                 priv->hook = NULL;
  409 
  410         return (0);
  411 }

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