ng_bpf.c

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    1 /*
    2  * ng_bpf.c
    3  */
    4 
    5 /*-
    6  * Copyright (c) 1999 Whistle Communications, Inc.
    7  * All rights reserved.
    8  * 
    9  * Subject to the following obligations and disclaimer of warranty, use and
   10  * redistribution of this software, in source or object code forms, with or
   11  * without modifications are expressly permitted by Whistle Communications;
   12  * provided, however, that:
   13  * 1. Any and all reproductions of the source or object code must include the
   14  *    copyright notice above and the following disclaimer of warranties; and
   15  * 2. No rights are granted, in any manner or form, to use Whistle
   16  *    Communications, Inc. trademarks, including the mark "WHISTLE
   17  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   18  *    such appears in the above copyright notice or in the software.
   19  * 
   20  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   21  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   22  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   23  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   25  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   26  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   27  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   28  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   29  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   30  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   31  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   32  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   35  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   36  * OF SUCH DAMAGE.
   37  *
   38  * Author: Archie Cobbs <archie@freebsd.org>
   39  *
   40  * $FreeBSD$
   41  * $Whistle: ng_bpf.c,v 1.3 1999/12/03 20:30:23 archie Exp $
   42  */
   43 
   44 /*
   45  * BPF NETGRAPH NODE TYPE
   46  *
   47  * This node type accepts any number of hook connections.  With each hook
   48  * is associated a bpf(4) filter program, and two hook names (each possibly
   49  * the empty string).  Incoming packets are compared against the filter;
   50  * matching packets are delivered out the first named hook (or dropped if
   51  * the empty string), and non-matching packets are delivered out the second
   52  * named hook (or dropped if the empty string).
   53  *
   54  * Each hook also keeps statistics about how many packets have matched, etc.
   55  */
   56 
   57 #include "opt_bpf.h"
   58 
   59 #include <sys/param.h>
   60 #include <sys/systm.h>
   61 #include <sys/errno.h>
   62 #include <sys/kernel.h>
   63 #include <sys/malloc.h>
   64 #include <sys/mbuf.h>
   65 
   66 #include <net/bpf.h>
   67 #ifdef BPF_JITTER
   68 #include <net/bpf_jitter.h>
   69 #endif
   70 
   71 #include <netgraph/ng_message.h>
   72 #include <netgraph/netgraph.h>
   73 #include <netgraph/ng_parse.h>
   74 #include <netgraph/ng_bpf.h>
   75 
   76 #ifdef NG_SEPARATE_MALLOC
   77 static MALLOC_DEFINE(M_NETGRAPH_BPF, "netgraph_bpf", "netgraph bpf node");
   78 #else
   79 #define M_NETGRAPH_BPF M_NETGRAPH
   80 #endif
   81 
   82 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
   83 
   84 #define ERROUT(x)       do { error = (x); goto done; } while (0)
   85 
   86 /* Per hook private info */
   87 struct ng_bpf_hookinfo {
   88         hook_p                  hook;
   89         hook_p                  match;
   90         hook_p                  nomatch;
   91         struct ng_bpf_hookprog  *prog;
   92 #ifdef BPF_JITTER
   93         bpf_jit_filter          *jit_prog;
   94 #endif
   95         struct ng_bpf_hookstat  stats;
   96 };
   97 typedef struct ng_bpf_hookinfo *hinfo_p;
   98 
   99 /* Netgraph methods */
  100 static ng_constructor_t ng_bpf_constructor;
  101 static ng_rcvmsg_t      ng_bpf_rcvmsg;
  102 static ng_shutdown_t    ng_bpf_shutdown;
  103 static ng_newhook_t     ng_bpf_newhook;
  104 static ng_rcvdata_t     ng_bpf_rcvdata;
  105 static ng_disconnect_t  ng_bpf_disconnect;
  106 
  107 /* Maximum bpf program instructions */
  108 extern int      bpf_maxinsns;
  109 
  110 /* Internal helper functions */
  111 static int      ng_bpf_setprog(hook_p hook, const struct ng_bpf_hookprog *hp);
  112 
  113 /* Parse type for one struct bfp_insn */
  114 static const struct ng_parse_struct_field ng_bpf_insn_type_fields[] = {
  115         { "code",       &ng_parse_hint16_type   },
  116         { "jt",         &ng_parse_uint8_type    },
  117         { "jf",         &ng_parse_uint8_type    },
  118         { "k",          &ng_parse_uint32_type   },
  119         { NULL }
  120 };
  121 static const struct ng_parse_type ng_bpf_insn_type = {
  122         &ng_parse_struct_type,
  123         &ng_bpf_insn_type_fields
  124 };
  125 
  126 /* Parse type for the field 'bpf_prog' in struct ng_bpf_hookprog */
  127 static int
  128 ng_bpf_hookprogary_getLength(const struct ng_parse_type *type,
  129         const u_char *start, const u_char *buf)
  130 {
  131         const struct ng_bpf_hookprog *hp;
  132 
  133         hp = (const struct ng_bpf_hookprog *)
  134             (buf - OFFSETOF(struct ng_bpf_hookprog, bpf_prog));
  135         return hp->bpf_prog_len;
  136 }
  137 
  138 static const struct ng_parse_array_info ng_bpf_hookprogary_info = {
  139         &ng_bpf_insn_type,
  140         &ng_bpf_hookprogary_getLength,
  141         NULL
  142 };
  143 static const struct ng_parse_type ng_bpf_hookprogary_type = {
  144         &ng_parse_array_type,
  145         &ng_bpf_hookprogary_info
  146 };
  147 
  148 /* Parse type for struct ng_bpf_hookprog */
  149 static const struct ng_parse_struct_field ng_bpf_hookprog_type_fields[]
  150         = NG_BPF_HOOKPROG_TYPE_INFO(&ng_bpf_hookprogary_type);
  151 static const struct ng_parse_type ng_bpf_hookprog_type = {
  152         &ng_parse_struct_type,
  153         &ng_bpf_hookprog_type_fields
  154 };
  155 
  156 /* Parse type for struct ng_bpf_hookstat */
  157 static const struct ng_parse_struct_field ng_bpf_hookstat_type_fields[]
  158         = NG_BPF_HOOKSTAT_TYPE_INFO;
  159 static const struct ng_parse_type ng_bpf_hookstat_type = {
  160         &ng_parse_struct_type,
  161         &ng_bpf_hookstat_type_fields
  162 };
  163 
  164 /* List of commands and how to convert arguments to/from ASCII */
  165 static const struct ng_cmdlist ng_bpf_cmdlist[] = {
  166         {
  167           NGM_BPF_COOKIE,
  168           NGM_BPF_SET_PROGRAM,
  169           "setprogram",
  170           &ng_bpf_hookprog_type,
  171           NULL
  172         },
  173         {
  174           NGM_BPF_COOKIE,
  175           NGM_BPF_GET_PROGRAM,
  176           "getprogram",
  177           &ng_parse_hookbuf_type,
  178           &ng_bpf_hookprog_type
  179         },
  180         {
  181           NGM_BPF_COOKIE,
  182           NGM_BPF_GET_STATS,
  183           "getstats",
  184           &ng_parse_hookbuf_type,
  185           &ng_bpf_hookstat_type
  186         },
  187         {
  188           NGM_BPF_COOKIE,
  189           NGM_BPF_CLR_STATS,
  190           "clrstats",
  191           &ng_parse_hookbuf_type,
  192           NULL
  193         },
  194         {
  195           NGM_BPF_COOKIE,
  196           NGM_BPF_GETCLR_STATS,
  197           "getclrstats",
  198           &ng_parse_hookbuf_type,
  199           &ng_bpf_hookstat_type
  200         },
  201         { 0 }
  202 };
  203 
  204 /* Netgraph type descriptor */
  205 static struct ng_type typestruct = {
  206         .version =      NG_ABI_VERSION,
  207         .name =         NG_BPF_NODE_TYPE,
  208         .constructor =  ng_bpf_constructor,
  209         .rcvmsg =       ng_bpf_rcvmsg,
  210         .shutdown =     ng_bpf_shutdown,
  211         .newhook =      ng_bpf_newhook,
  212         .rcvdata =      ng_bpf_rcvdata,
  213         .disconnect =   ng_bpf_disconnect,
  214         .cmdlist =      ng_bpf_cmdlist,
  215 };
  216 NETGRAPH_INIT(bpf, &typestruct);
  217 
  218 /* Default BPF program for a hook that matches nothing */
  219 static const struct ng_bpf_hookprog ng_bpf_default_prog = {
  220         { '\0' },               /* to be filled in at hook creation time */
  221         { '\0' },
  222         { '\0' },
  223         1,
  224         { BPF_STMT(BPF_RET+BPF_K, 0) }
  225 };
  226 
  227 /*
  228  * Node constructor
  229  *
  230  * We don't keep any per-node private data
  231  * We go via the hooks.
  232  */
  233 static int
  234 ng_bpf_constructor(node_p node)
  235 {
  236         NG_NODE_SET_PRIVATE(node, NULL);
  237         return (0);
  238 }
  239 
  240 /*
  241  * Callback functions to be used by NG_NODE_FOREACH_HOOK() macro.
  242  */
  243 static int
  244 ng_bpf_addrefs(hook_p hook, void* arg)
  245 {
  246         hinfo_p hip = NG_HOOK_PRIVATE(hook);
  247         hook_p h = (hook_p)arg;
  248 
  249         if (strcmp(hip->prog->ifMatch, NG_HOOK_NAME(h)) == 0)
  250             hip->match = h;
  251         if (strcmp(hip->prog->ifNotMatch, NG_HOOK_NAME(h)) == 0)
  252             hip->nomatch = h;
  253         return (1);
  254 }
  255 
  256 static int
  257 ng_bpf_remrefs(hook_p hook, void* arg)
  258 {
  259         hinfo_p hip = NG_HOOK_PRIVATE(hook);
  260         hook_p h = (hook_p)arg;
  261 
  262         if (hip->match == h)
  263             hip->match = NULL;
  264         if (hip->nomatch == h)
  265             hip->nomatch = NULL;
  266         return (1);
  267 }
  268 
  269 /*
  270  * Add a hook
  271  */
  272 static int
  273 ng_bpf_newhook(node_p node, hook_p hook, const char *name)
  274 {
  275         hinfo_p hip;
  276         int error;
  277 
  278         /* Create hook private structure */
  279         hip = malloc(sizeof(*hip), M_NETGRAPH_BPF, M_NOWAIT | M_ZERO);
  280         if (hip == NULL)
  281                 return (ENOMEM);
  282         hip->hook = hook;
  283         NG_HOOK_SET_PRIVATE(hook, hip);
  284 
  285         /* Add our reference into other hooks data. */
  286         NG_NODE_FOREACH_HOOK(node, ng_bpf_addrefs, hook);
  287 
  288         /* Attach the default BPF program */
  289         if ((error = ng_bpf_setprog(hook, &ng_bpf_default_prog)) != 0) {
  290                 free(hip, M_NETGRAPH_BPF);
  291                 NG_HOOK_SET_PRIVATE(hook, NULL);
  292                 return (error);
  293         }
  294 
  295         /* Set hook name */
  296         strlcpy(hip->prog->thisHook, name, sizeof(hip->prog->thisHook));
  297         return (0);
  298 }
  299 
  300 /*
  301  * Receive a control message
  302  */
  303 static int
  304 ng_bpf_rcvmsg(node_p node, item_p item, hook_p lasthook)
  305 {
  306         struct ng_mesg *msg;
  307         struct ng_mesg *resp = NULL;
  308         int error = 0;
  309 
  310         NGI_GET_MSG(item, msg);
  311         switch (msg->header.typecookie) {
  312         case NGM_BPF_COOKIE:
  313                 switch (msg->header.cmd) {
  314                 case NGM_BPF_SET_PROGRAM:
  315                     {
  316                         struct ng_bpf_hookprog *const
  317                             hp = (struct ng_bpf_hookprog *)msg->data;
  318                         hook_p hook;
  319 
  320                         /* Sanity check */
  321                         if (msg->header.arglen < sizeof(*hp)
  322                             || msg->header.arglen
  323                               != NG_BPF_HOOKPROG_SIZE(hp->bpf_prog_len))
  324                                 ERROUT(EINVAL);
  325 
  326                         /* Find hook */
  327                         if ((hook = ng_findhook(node, hp->thisHook)) == NULL)
  328                                 ERROUT(ENOENT);
  329 
  330                         /* Set new program */
  331                         if ((error = ng_bpf_setprog(hook, hp)) != 0)
  332                                 ERROUT(error);
  333                         break;
  334                     }
  335 
  336                 case NGM_BPF_GET_PROGRAM:
  337                     {
  338                         struct ng_bpf_hookprog *hp;
  339                         hook_p hook;
  340 
  341                         /* Sanity check */
  342                         if (msg->header.arglen == 0)
  343                                 ERROUT(EINVAL);
  344                         msg->data[msg->header.arglen - 1] = '\0';
  345 
  346                         /* Find hook */
  347                         if ((hook = ng_findhook(node, msg->data)) == NULL)
  348                                 ERROUT(ENOENT);
  349 
  350                         /* Build response */
  351                         hp = ((hinfo_p)NG_HOOK_PRIVATE(hook))->prog;
  352                         NG_MKRESPONSE(resp, msg,
  353                             NG_BPF_HOOKPROG_SIZE(hp->bpf_prog_len), M_NOWAIT);
  354                         if (resp == NULL)
  355                                 ERROUT(ENOMEM);
  356                         bcopy(hp, resp->data,
  357                            NG_BPF_HOOKPROG_SIZE(hp->bpf_prog_len));
  358                         break;
  359                     }
  360 
  361                 case NGM_BPF_GET_STATS:
  362                 case NGM_BPF_CLR_STATS:
  363                 case NGM_BPF_GETCLR_STATS:
  364                     {
  365                         struct ng_bpf_hookstat *stats;
  366                         hook_p hook;
  367 
  368                         /* Sanity check */
  369                         if (msg->header.arglen == 0)
  370                                 ERROUT(EINVAL);
  371                         msg->data[msg->header.arglen - 1] = '\0';
  372 
  373                         /* Find hook */
  374                         if ((hook = ng_findhook(node, msg->data)) == NULL)
  375                                 ERROUT(ENOENT);
  376                         stats = &((hinfo_p)NG_HOOK_PRIVATE(hook))->stats;
  377 
  378                         /* Build response (if desired) */
  379                         if (msg->header.cmd != NGM_BPF_CLR_STATS) {
  380                                 NG_MKRESPONSE(resp,
  381                                     msg, sizeof(*stats), M_NOWAIT);
  382                                 if (resp == NULL)
  383                                         ERROUT(ENOMEM);
  384                                 bcopy(stats, resp->data, sizeof(*stats));
  385                         }
  386 
  387                         /* Clear stats (if desired) */
  388                         if (msg->header.cmd != NGM_BPF_GET_STATS)
  389                                 bzero(stats, sizeof(*stats));
  390                         break;
  391                     }
  392 
  393                 default:
  394                         error = EINVAL;
  395                         break;
  396                 }
  397                 break;
  398         default:
  399                 error = EINVAL;
  400                 break;
  401         }
  402 done:
  403         NG_RESPOND_MSG(error, node, item, resp);
  404         NG_FREE_MSG(msg);
  405         return (error);
  406 }
  407 
  408 /*
  409  * Receive data on a hook
  410  *
  411  * Apply the filter, and then drop or forward packet as appropriate.
  412  */
  413 static int
  414 ng_bpf_rcvdata(hook_p hook, item_p item)
  415 {
  416         const hinfo_p hip = NG_HOOK_PRIVATE(hook);
  417         int totlen;
  418         int needfree = 0, error = 0, usejit = 0;
  419         u_char *data = NULL;
  420         hinfo_p dhip;
  421         hook_p dest;
  422         u_int len;
  423         struct mbuf *m;
  424 
  425         m = NGI_M(item);        /* 'item' still owns it.. we are peeking */ 
  426         totlen = m->m_pkthdr.len;
  427         /* Update stats on incoming hook. XXX Can we do 64 bits atomically? */
  428         /* atomic_add_int64(&hip->stats.recvFrames, 1); */
  429         /* atomic_add_int64(&hip->stats.recvOctets, totlen); */
  430         hip->stats.recvFrames++; 
  431         hip->stats.recvOctets += totlen;
  432 
  433         /* Don't call bpf_filter() with totlen == 0! */
  434         if (totlen == 0) {
  435                 len = 0;
  436                 goto ready;
  437         }
  438 
  439 #ifdef BPF_JITTER
  440         if (bpf_jitter_enable != 0 && hip->jit_prog != NULL)
  441                 usejit = 1;
  442 #endif
  443 
  444         /* Need to put packet in contiguous memory for bpf */
  445         if (m->m_next != NULL && totlen > MHLEN) {
  446                 if (usejit) {
  447                         data = malloc(totlen, M_NETGRAPH_BPF, M_NOWAIT);
  448                         if (data == NULL) {
  449                                 NG_FREE_ITEM(item);
  450                                 return (ENOMEM);
  451                         }
  452                         needfree = 1;
  453                         m_copydata(m, 0, totlen, (caddr_t)data);
  454                 }
  455         } else {
  456                 if (m->m_next != NULL) {
  457                         NGI_M(item) = m = m_pullup(m, totlen);
  458                         if (m == NULL) {
  459                                 NG_FREE_ITEM(item);
  460                                 return (ENOBUFS);
  461                         }
  462                 }
  463                 data = mtod(m, u_char *);
  464         }
  465 
  466         /* Run packet through filter */
  467 #ifdef BPF_JITTER
  468         if (usejit)
  469                 len = (*(hip->jit_prog->func))(data, totlen, totlen);
  470         else
  471 #endif
  472         if (data)
  473                 len = bpf_filter(hip->prog->bpf_prog, data, totlen, totlen);
  474         else
  475                 len = bpf_filter(hip->prog->bpf_prog, (u_char *)m, totlen, 0);
  476         if (needfree)
  477                 free(data, M_NETGRAPH_BPF);
  478 ready:
  479         /* See if we got a match and find destination hook */
  480         if (len > 0) {
  481                 /* Update stats */
  482                 /* XXX atomically? */
  483                 hip->stats.recvMatchFrames++;
  484                 hip->stats.recvMatchOctets += totlen;
  485 
  486                 /* Truncate packet length if required by the filter */
  487                 /* Assume this never changes m */
  488                 if (len < totlen) {
  489                         m_adj(m, -(totlen - len));
  490                         totlen = len;
  491                 }
  492                 dest = hip->match;
  493         } else
  494                 dest = hip->nomatch;
  495         if (dest == NULL) {
  496                 NG_FREE_ITEM(item);
  497                 return (0);
  498         }
  499 
  500         /* Deliver frame out destination hook */
  501         dhip = NG_HOOK_PRIVATE(dest);
  502         dhip->stats.xmitOctets += totlen;
  503         dhip->stats.xmitFrames++;
  504         NG_FWD_ITEM_HOOK(error, item, dest);
  505         return (error);
  506 }
  507 
  508 /*
  509  * Shutdown processing
  510  */
  511 static int
  512 ng_bpf_shutdown(node_p node)
  513 {
  514         NG_NODE_UNREF(node);
  515         return (0);
  516 }
  517 
  518 /*
  519  * Hook disconnection
  520  */
  521 static int
  522 ng_bpf_disconnect(hook_p hook)
  523 {
  524         const node_p node = NG_HOOK_NODE(hook);
  525         const hinfo_p hip = NG_HOOK_PRIVATE(hook);
  526 
  527         KASSERT(hip != NULL, ("%s: null info", __func__));
  528 
  529         /* Remove our reference from other hooks data. */
  530         NG_NODE_FOREACH_HOOK(node, ng_bpf_remrefs, hook);
  531 
  532         free(hip->prog, M_NETGRAPH_BPF);
  533 #ifdef BPF_JITTER
  534         if (hip->jit_prog != NULL)
  535                 bpf_destroy_jit_filter(hip->jit_prog);
  536 #endif
  537         free(hip, M_NETGRAPH_BPF);
  538         if ((NG_NODE_NUMHOOKS(node) == 0) &&
  539             (NG_NODE_IS_VALID(node))) {
  540                 ng_rmnode_self(node);
  541         }
  542         return (0);
  543 }
  544 
  545 /************************************************************************
  546                         HELPER STUFF
  547  ************************************************************************/
  548 
  549 /*
  550  * Set the BPF program associated with a hook
  551  */
  552 static int
  553 ng_bpf_setprog(hook_p hook, const struct ng_bpf_hookprog *hp0)
  554 {
  555         const hinfo_p hip = NG_HOOK_PRIVATE(hook);
  556         struct ng_bpf_hookprog *hp;
  557 #ifdef BPF_JITTER
  558         bpf_jit_filter *jit_prog;
  559 #endif
  560         int size;
  561 
  562         /* Check program for validity */
  563         if (hp0->bpf_prog_len > bpf_maxinsns ||
  564             !bpf_validate(hp0->bpf_prog, hp0->bpf_prog_len))
  565                 return (EINVAL);
  566 
  567         /* Make a copy of the program */
  568         size = NG_BPF_HOOKPROG_SIZE(hp0->bpf_prog_len);
  569         hp = malloc(size, M_NETGRAPH_BPF, M_NOWAIT);
  570         if (hp == NULL)
  571                 return (ENOMEM);
  572         bcopy(hp0, hp, size);
  573 #ifdef BPF_JITTER
  574         jit_prog = bpf_jitter(hp->bpf_prog, hp->bpf_prog_len);
  575 #endif
  576 
  577         /* Free previous program, if any, and assign new one */
  578         if (hip->prog != NULL)
  579                 free(hip->prog, M_NETGRAPH_BPF);
  580         hip->prog = hp;
  581 #ifdef BPF_JITTER
  582         if (hip->jit_prog != NULL)
  583                 bpf_destroy_jit_filter(hip->jit_prog);
  584         hip->jit_prog = jit_prog;
  585 #endif
  586 
  587         /* Prepare direct references on target hooks. */
  588         hip->match = ng_findhook(NG_HOOK_NODE(hook), hip->prog->ifMatch);
  589         hip->nomatch = ng_findhook(NG_HOOK_NODE(hook), hip->prog->ifNotMatch);
  590         return (0);
  591 }
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FreeBSD/Linux Kernel Cross Reference sys/netgraph/ng_bpf.c

FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_bpf.c
