The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_patch.c

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    1 /*-
    2  * Copyright (C) 2010 by Maxim Ignatenko <gelraen.ua@gmail.com>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/11.0/sys/netgraph/ng_patch.c 234574 2012-04-22 17:00:52Z melifaro $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/kernel.h>
   34 #include <sys/endian.h>
   35 #include <sys/malloc.h>
   36 #include <sys/mbuf.h>
   37 #include <netgraph/ng_message.h>
   38 #include <netgraph/ng_parse.h>
   39 #include <netgraph/ng_patch.h>
   40 #include <netgraph/netgraph.h>
   41 
   42 static ng_constructor_t ng_patch_constructor;
   43 static ng_rcvmsg_t      ng_patch_rcvmsg;
   44 static ng_shutdown_t    ng_patch_shutdown;
   45 static ng_newhook_t     ng_patch_newhook;
   46 static ng_rcvdata_t     ng_patch_rcvdata;
   47 static ng_disconnect_t  ng_patch_disconnect;
   48 
   49 static int
   50 ng_patch_config_getlen(const struct ng_parse_type *type,
   51     const u_char *start, const u_char *buf)
   52 {
   53         const struct ng_patch_config *p;
   54 
   55         p = (const struct ng_patch_config *)(buf -
   56             offsetof(struct ng_patch_config, ops));
   57         return (p->count);
   58 }
   59 
   60 static const struct ng_parse_struct_field ng_patch_op_type_fields[]
   61         = NG_PATCH_OP_TYPE_INFO;
   62 static const struct ng_parse_type ng_patch_op_type = {
   63         &ng_parse_struct_type,
   64         &ng_patch_op_type_fields
   65 };
   66 
   67 static const struct ng_parse_array_info ng_patch_confarr_info = {
   68         &ng_patch_op_type,
   69         &ng_patch_config_getlen
   70 };
   71 static const struct ng_parse_type ng_patch_confarr_type = {
   72         &ng_parse_array_type,
   73         &ng_patch_confarr_info
   74 };
   75 
   76 static const struct ng_parse_struct_field ng_patch_config_type_fields[]
   77         = NG_PATCH_CONFIG_TYPE_INFO;
   78 static const struct ng_parse_type ng_patch_config_type = {
   79         &ng_parse_struct_type,
   80         &ng_patch_config_type_fields
   81 };
   82 
   83 static const struct ng_parse_struct_field ng_patch_stats_fields[]
   84         = NG_PATCH_STATS_TYPE_INFO;
   85 static const struct ng_parse_type ng_patch_stats_type = {
   86         &ng_parse_struct_type,
   87         &ng_patch_stats_fields
   88 };
   89 
   90 static const struct ng_cmdlist ng_patch_cmdlist[] = {
   91         {
   92                 NGM_PATCH_COOKIE,
   93                 NGM_PATCH_GETCONFIG,
   94                 "getconfig",
   95                 NULL,
   96                 &ng_patch_config_type
   97         },
   98         {
   99                 NGM_PATCH_COOKIE,
  100                 NGM_PATCH_SETCONFIG,
  101                 "setconfig",
  102                 &ng_patch_config_type,
  103                 NULL
  104         },
  105         {
  106                 NGM_PATCH_COOKIE,
  107                 NGM_PATCH_GET_STATS,
  108                 "getstats",
  109                 NULL,
  110                 &ng_patch_stats_type
  111         },
  112         {
  113                 NGM_PATCH_COOKIE,
  114                 NGM_PATCH_CLR_STATS,
  115                 "clrstats",
  116                 NULL,
  117                 NULL
  118         },
  119         {
  120                 NGM_PATCH_COOKIE,
  121                 NGM_PATCH_GETCLR_STATS,
  122                 "getclrstats",
  123                 NULL,
  124                 &ng_patch_stats_type
  125         },
  126         { 0 }
  127 };
  128 
  129 static struct ng_type typestruct = {
  130         .version =      NG_ABI_VERSION,
  131         .name =         NG_PATCH_NODE_TYPE,
  132         .constructor =  ng_patch_constructor,
  133         .rcvmsg =       ng_patch_rcvmsg,
  134         .shutdown =     ng_patch_shutdown,
  135         .newhook =      ng_patch_newhook,
  136         .rcvdata =      ng_patch_rcvdata,
  137         .disconnect =   ng_patch_disconnect,
  138         .cmdlist =      ng_patch_cmdlist,
  139 };
  140 NETGRAPH_INIT(patch, &typestruct);
  141 
  142 union patch_val {
  143         uint8_t         v1;
  144         uint16_t        v2;
  145         uint32_t        v4;
  146         uint64_t        v8;
  147 };
  148 
  149 struct ng_patch_priv {
  150         hook_p          in;
  151         hook_p          out;
  152         struct ng_patch_config *config;
  153         union patch_val *val;
  154         struct ng_patch_stats stats;
  155 };
  156 typedef struct ng_patch_priv *priv_p;
  157 
  158 #define NG_PATCH_CONF_SIZE(count)       (sizeof(struct ng_patch_config) + \
  159                 (count) * sizeof(struct ng_patch_op))
  160 
  161 static void do_patch(priv_p conf, struct mbuf *m);
  162 
  163 static int
  164 ng_patch_constructor(node_p node)
  165 {
  166         priv_p privdata;
  167 
  168         privdata = malloc(sizeof(*privdata), M_NETGRAPH, M_WAITOK | M_ZERO);
  169         NG_NODE_SET_PRIVATE(node, privdata);
  170         privdata->in = NULL;
  171         privdata->out = NULL;
  172         privdata->config = NULL;
  173         return (0);
  174 }
  175 
  176 static int
  177 ng_patch_newhook(node_p node, hook_p hook, const char *name)
  178 {
  179         const priv_p privp = NG_NODE_PRIVATE(node);
  180 
  181         if (strncmp(name, NG_PATCH_HOOK_IN, strlen(NG_PATCH_HOOK_IN)) == 0) {
  182                 privp->in = hook;
  183         } else if (strncmp(name, NG_PATCH_HOOK_OUT,
  184             strlen(NG_PATCH_HOOK_OUT)) == 0) {
  185                 privp->out = hook;
  186         } else
  187                 return (EINVAL);
  188         return(0);
  189 }
  190 
  191 static int
  192 ng_patch_rcvmsg(node_p node, item_p item, hook_p lasthook)
  193 {
  194         const priv_p privp = NG_NODE_PRIVATE(node);
  195         struct ng_patch_config *conf, *newconf;
  196         union patch_val *newval;
  197         struct ng_mesg *msg;
  198         struct ng_mesg *resp;
  199         int i, clear, error;
  200 
  201         clear = error = 0;
  202         resp = NULL;
  203         NGI_GET_MSG(item, msg);
  204         switch (msg->header.typecookie) {
  205         case NGM_PATCH_COOKIE:
  206                 switch (msg->header.cmd) {
  207                 case NGM_PATCH_GETCONFIG:
  208                         if (privp->config == NULL)
  209                                 break;
  210                         NG_MKRESPONSE(resp, msg,
  211                             NG_PATCH_CONF_SIZE(privp->config->count),
  212                             M_WAITOK);
  213                         bcopy(privp->config, resp->data,
  214                             NG_PATCH_CONF_SIZE(privp->config->count));
  215                         break;
  216                 case NGM_PATCH_SETCONFIG:
  217                     {
  218                         if (msg->header.arglen <
  219                             sizeof(struct ng_patch_config)) {
  220                                 error = EINVAL;
  221                                 break;
  222                         }
  223 
  224                         conf = (struct ng_patch_config *)msg->data;
  225                         if (msg->header.arglen <
  226                             NG_PATCH_CONF_SIZE(conf->count)) {
  227                                 error = EINVAL;
  228                                 break;
  229                         }
  230 
  231                         for(i = 0; i < conf->count; i++) {
  232                                 switch(conf->ops[i].length) {
  233                                 case 1:
  234                                 case 2:
  235                                 case 4:
  236                                 case 8:
  237                                         break;
  238                                 default:
  239                                         error = EINVAL;
  240                                         break;
  241                                 }
  242                                 if (error != 0)
  243                                         break;
  244                         }
  245 
  246                         conf->csum_flags &= CSUM_IP | CSUM_TCP | CSUM_UDP |
  247                             CSUM_SCTP;
  248 
  249                         if (error == 0) {
  250                                 newconf = malloc(
  251                                     NG_PATCH_CONF_SIZE(conf->count),
  252                                     M_NETGRAPH, M_WAITOK);
  253                                 newval = malloc(conf->count *
  254                                     sizeof(union patch_val), M_NETGRAPH,
  255                                     M_WAITOK);
  256                                 for(i = 0; i < conf->count; i++) {
  257                                         switch (conf->ops[i].length) {
  258                                         case 1:
  259                                                 newval[i].v1 =
  260                                                     conf->ops[i].value;
  261                                                 break;
  262                                         case 2:
  263                                                 newval[i].v2 =
  264                                                     conf->ops[i].value;
  265                                                 break;
  266                                         case 4:
  267                                                 newval[i].v4 =
  268                                                     conf->ops[i].value;
  269                                                 break;
  270                                         case 8:
  271                                                 newval[i].v8 =
  272                                                     conf->ops[i].value;
  273                                                 break;
  274                                         }
  275                                 }
  276                                 bcopy(conf, newconf,
  277                                     NG_PATCH_CONF_SIZE(conf->count));
  278                                 if (privp->val != NULL)
  279                                         free(privp->val, M_NETGRAPH);
  280                                 privp->val = newval;
  281                                 if (privp->config != NULL)
  282                                         free(privp->config, M_NETGRAPH);
  283                                 privp->config = newconf;
  284                         }
  285                         break;
  286                     }
  287                 case NGM_PATCH_GETCLR_STATS:
  288                         clear = 1;
  289                         /* FALLTHROUGH */
  290                 case NGM_PATCH_GET_STATS:
  291                         NG_MKRESPONSE(resp, msg, sizeof(struct ng_patch_stats),
  292                             M_WAITOK);
  293                         bcopy(&(privp->stats), resp->data,
  294                             sizeof(struct ng_patch_stats));
  295                         if (clear == 0)
  296                                 break;
  297                         /* else FALLTHROUGH */
  298                 case NGM_PATCH_CLR_STATS:
  299                         bzero(&(privp->stats), sizeof(struct ng_patch_stats));
  300                         break;
  301                 default:
  302                         error = EINVAL;
  303                         break;
  304                 }
  305                 break;
  306         default:
  307                 error = EINVAL;
  308                 break;
  309         }
  310 
  311         NG_RESPOND_MSG(error, node, item, resp);
  312         NG_FREE_MSG(msg);
  313         return(error);
  314 }
  315 
  316 static void
  317 do_patch(priv_p privp, struct mbuf *m)
  318 {
  319         struct ng_patch_config *conf;
  320         uint64_t buf;
  321         int i, patched;
  322 
  323         conf = privp->config;
  324         patched = 0;
  325         for(i = 0; i < conf->count; i++) {
  326                 if (conf->ops[i].offset + conf->ops[i].length >
  327                     m->m_pkthdr.len)
  328                         continue;
  329 
  330                 /* for "=" operation we don't need to copy data from mbuf */
  331                 if (conf->ops[i].mode != NG_PATCH_MODE_SET) {
  332                         m_copydata(m, conf->ops[i].offset,
  333                             conf->ops[i].length, (caddr_t)&buf);
  334                 }
  335 
  336                 switch (conf->ops[i].length) {
  337                 case 1:
  338                         switch (conf->ops[i].mode) {
  339                         case NG_PATCH_MODE_SET:
  340                                 *((uint8_t *)&buf) = privp->val[i].v1;
  341                                 break;
  342                         case NG_PATCH_MODE_ADD:
  343                                 *((uint8_t *)&buf) += privp->val[i].v1;
  344                                 break;
  345                         case NG_PATCH_MODE_SUB:
  346                                 *((uint8_t *)&buf) -= privp->val[i].v1;
  347                                 break;
  348                         case NG_PATCH_MODE_MUL:
  349                                 *((uint8_t *)&buf) *= privp->val[i].v1;
  350                                 break;
  351                         case NG_PATCH_MODE_DIV:
  352                                 *((uint8_t *)&buf) /= privp->val[i].v1;
  353                                 break;
  354                         case NG_PATCH_MODE_NEG:
  355                                 *((int8_t *)&buf) = - *((int8_t *)&buf);
  356                                 break;
  357                         case NG_PATCH_MODE_AND:
  358                                 *((uint8_t *)&buf) &= privp->val[i].v1;
  359                                 break;
  360                         case NG_PATCH_MODE_OR:
  361                                 *((uint8_t *)&buf) |= privp->val[i].v1;
  362                                 break;
  363                         case NG_PATCH_MODE_XOR:
  364                                 *((uint8_t *)&buf) ^= privp->val[i].v1;
  365                                 break;
  366                         case NG_PATCH_MODE_SHL:
  367                                 *((uint8_t *)&buf) <<= privp->val[i].v1;
  368                                 break;
  369                         case NG_PATCH_MODE_SHR:
  370                                 *((uint8_t *)&buf) >>= privp->val[i].v1;
  371                                 break;
  372                         }
  373                         break;
  374                 case 2:
  375                         *((int16_t *)&buf) =  ntohs(*((int16_t *)&buf));
  376                         switch (conf->ops[i].mode) {
  377                         case NG_PATCH_MODE_SET:
  378                                 *((uint16_t *)&buf) = privp->val[i].v2;
  379                                 break;
  380                         case NG_PATCH_MODE_ADD:
  381                                 *((uint16_t *)&buf) += privp->val[i].v2;
  382                                 break;
  383                         case NG_PATCH_MODE_SUB:
  384                                 *((uint16_t *)&buf) -= privp->val[i].v2;
  385                                 break;
  386                         case NG_PATCH_MODE_MUL:
  387                                 *((uint16_t *)&buf) *= privp->val[i].v2;
  388                                 break;
  389                         case NG_PATCH_MODE_DIV:
  390                                 *((uint16_t *)&buf) /= privp->val[i].v2;
  391                                 break;
  392                         case NG_PATCH_MODE_NEG:
  393                                 *((int16_t *)&buf) = - *((int16_t *)&buf);
  394                                 break;
  395                         case NG_PATCH_MODE_AND:
  396                                 *((uint16_t *)&buf) &= privp->val[i].v2;
  397                                 break;
  398                         case NG_PATCH_MODE_OR:
  399                                 *((uint16_t *)&buf) |= privp->val[i].v2;
  400                                 break;
  401                         case NG_PATCH_MODE_XOR:
  402                                 *((uint16_t *)&buf) ^= privp->val[i].v2;
  403                                 break;
  404                         case NG_PATCH_MODE_SHL:
  405                                 *((uint16_t *)&buf) <<= privp->val[i].v2;
  406                                 break;
  407                         case NG_PATCH_MODE_SHR:
  408                                 *((uint16_t *)&buf) >>= privp->val[i].v2;
  409                                 break;
  410                         }
  411                         *((int16_t *)&buf) =  htons(*((int16_t *)&buf));
  412                         break;
  413                 case 4:
  414                         *((int32_t *)&buf) =  ntohl(*((int32_t *)&buf));
  415                         switch (conf->ops[i].mode) {
  416                         case NG_PATCH_MODE_SET:
  417                                 *((uint32_t *)&buf) = privp->val[i].v4;
  418                                 break;
  419                         case NG_PATCH_MODE_ADD:
  420                                 *((uint32_t *)&buf) += privp->val[i].v4;
  421                                 break;
  422                         case NG_PATCH_MODE_SUB:
  423                                 *((uint32_t *)&buf) -= privp->val[i].v4;
  424                                 break;
  425                         case NG_PATCH_MODE_MUL:
  426                                 *((uint32_t *)&buf) *= privp->val[i].v4;
  427                                 break;
  428                         case NG_PATCH_MODE_DIV:
  429                                 *((uint32_t *)&buf) /= privp->val[i].v4;
  430                                 break;
  431                         case NG_PATCH_MODE_NEG:
  432                                 *((int32_t *)&buf) = - *((int32_t *)&buf);
  433                                 break;
  434                         case NG_PATCH_MODE_AND:
  435                                 *((uint32_t *)&buf) &= privp->val[i].v4;
  436                                 break;
  437                         case NG_PATCH_MODE_OR:
  438                                 *((uint32_t *)&buf) |= privp->val[i].v4;
  439                                 break;
  440                         case NG_PATCH_MODE_XOR:
  441                                 *((uint32_t *)&buf) ^= privp->val[i].v4;
  442                                 break;
  443                         case NG_PATCH_MODE_SHL:
  444                                 *((uint32_t *)&buf) <<= privp->val[i].v4;
  445                                 break;
  446                         case NG_PATCH_MODE_SHR:
  447                                 *((uint32_t *)&buf) >>= privp->val[i].v4;
  448                                 break;
  449                         }
  450                         *((int32_t *)&buf) =  htonl(*((int32_t *)&buf));
  451                         break;
  452                 case 8:
  453                         *((int64_t *)&buf) =  be64toh(*((int64_t *)&buf));
  454                         switch (conf->ops[i].mode) {
  455                         case NG_PATCH_MODE_SET:
  456                                 *((uint64_t *)&buf) = privp->val[i].v8;
  457                                 break;
  458                         case NG_PATCH_MODE_ADD:
  459                                 *((uint64_t *)&buf) += privp->val[i].v8;
  460                                 break;
  461                         case NG_PATCH_MODE_SUB:
  462                                 *((uint64_t *)&buf) -= privp->val[i].v8;
  463                                 break;
  464                         case NG_PATCH_MODE_MUL:
  465                                 *((uint64_t *)&buf) *= privp->val[i].v8;
  466                                 break;
  467                         case NG_PATCH_MODE_DIV:
  468                                 *((uint64_t *)&buf) /= privp->val[i].v8;
  469                                 break;
  470                         case NG_PATCH_MODE_NEG:
  471                                 *((int64_t *)&buf) = - *((int64_t *)&buf);
  472                                 break;
  473                         case NG_PATCH_MODE_AND:
  474                                 *((uint64_t *)&buf) &= privp->val[i].v8;
  475                                 break;
  476                         case NG_PATCH_MODE_OR:
  477                                 *((uint64_t *)&buf) |= privp->val[i].v8;
  478                                 break;
  479                         case NG_PATCH_MODE_XOR:
  480                                 *((uint64_t *)&buf) ^= privp->val[i].v8;
  481                                 break;
  482                         case NG_PATCH_MODE_SHL:
  483                                 *((uint64_t *)&buf) <<= privp->val[i].v8;
  484                                 break;
  485                         case NG_PATCH_MODE_SHR:
  486                                 *((uint64_t *)&buf) >>= privp->val[i].v8;
  487                                 break;
  488                         }
  489                         *((int64_t *)&buf) =  htobe64(*((int64_t *)&buf));
  490                         break;
  491                 }
  492 
  493                 m_copyback(m, conf->ops[i].offset, conf->ops[i].length,
  494                     (caddr_t)&buf);
  495                 patched = 1;
  496         }
  497         if (patched > 0)
  498                 privp->stats.patched++;
  499 }
  500 
  501 static int
  502 ng_patch_rcvdata(hook_p hook, item_p item)
  503 {
  504         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  505         struct mbuf *m;
  506         hook_p target;
  507         int error;
  508 
  509         priv->stats.received++;
  510         NGI_GET_M(item, m);
  511         if (priv->config != NULL && hook == priv->in &&
  512             (m->m_flags & M_PKTHDR) != 0) {
  513                 m = m_unshare(m,M_NOWAIT);
  514                 if (m == NULL) {
  515                         priv->stats.dropped++;
  516                         NG_FREE_ITEM(item);
  517                         return (ENOMEM);
  518                 }
  519                 do_patch(priv, m);
  520                 m->m_pkthdr.csum_flags |= priv->config->csum_flags;
  521         }
  522 
  523         target = NULL;
  524         if (hook == priv->in) {
  525                 /* return frames on 'in' hook if 'out' not connected */
  526                 if (priv->out != NULL)
  527                         target = priv->out;
  528                 else
  529                         target = priv->in;
  530         }
  531         if (hook == priv->out && priv->in != NULL)
  532                 target = priv->in;
  533 
  534         if (target == NULL) {
  535                 priv->stats.dropped++;
  536                 NG_FREE_ITEM(item);
  537                 NG_FREE_M(m);
  538                 return (0);
  539         }
  540         NG_FWD_NEW_DATA(error, item, target, m);
  541         return (error);
  542 }
  543 
  544 static int
  545 ng_patch_shutdown(node_p node)
  546 {
  547         const priv_p privdata = NG_NODE_PRIVATE(node);
  548 
  549         if (privdata->val != NULL)
  550                 free(privdata->val, M_NETGRAPH);
  551         if (privdata->config != NULL)
  552                 free(privdata->config, M_NETGRAPH);
  553         NG_NODE_SET_PRIVATE(node, NULL);
  554         NG_NODE_UNREF(node);
  555         free(privdata, M_NETGRAPH);
  556         return (0);
  557 }
  558 
  559 static int
  560 ng_patch_disconnect(hook_p hook)
  561 {
  562         priv_p priv;
  563 
  564         priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  565         if (hook == priv->in) {
  566                 priv->in = NULL;
  567         }
  568         if (hook == priv->out) {
  569                 priv->out = NULL;
  570         }
  571         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
  572             NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) /* already shutting down? */
  573                 ng_rmnode_self(NG_HOOK_NODE(hook));
  574         return (0);
  575 }
  576 

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