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/7.4/sys/netgraph/ng_patch.c 210019 2010-07-13 20:13:38Z ae $");
   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_WAIT | 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), M_WAIT);
  212                         bcopy(privp->config, resp->data,
  213                             NG_PATCH_CONF_SIZE(privp->config->count));
  214                         break;
  215                 case NGM_PATCH_SETCONFIG:
  216                     {
  217                         if (msg->header.arglen <
  218                             sizeof(struct ng_patch_config)) {
  219                                 error = EINVAL;
  220                                 break;
  221                         }
  222 
  223                         conf = (struct ng_patch_config *)msg->data;
  224                         if (msg->header.arglen <
  225                             NG_PATCH_CONF_SIZE(conf->count)) {
  226                                 error = EINVAL;
  227                                 break;
  228                         }
  229 
  230                         for(i = 0; i < conf->count; i++) {
  231                                 switch(conf->ops[i].length) {
  232                                 case 1:
  233                                 case 2:
  234                                 case 4:
  235                                 case 8:
  236                                         break;
  237                                 default:
  238                                         error = EINVAL;
  239                                         break;
  240                                 }
  241                                 if (error != 0)
  242                                         break;
  243                         }
  244 
  245                         conf->csum_flags &= CSUM_IP | CSUM_TCP | CSUM_UDP |
  246                             CSUM_SCTP;
  247 
  248                         if (error == 0) {
  249                                 newconf = malloc(
  250                                     NG_PATCH_CONF_SIZE(conf->count),
  251                                     M_NETGRAPH, M_WAIT);
  252                                 newval = malloc(conf->count *
  253                                     sizeof(union patch_val), M_NETGRAPH,
  254                                     M_WAIT);
  255                                 for(i = 0; i < conf->count; i++) {
  256                                         switch (conf->ops[i].length) {
  257                                         case 1:
  258                                                 newval[i].v1 =
  259                                                     conf->ops[i].value;
  260                                                 break;
  261                                         case 2:
  262                                                 newval[i].v2 =
  263                                                     conf->ops[i].value;
  264                                                 break;
  265                                         case 4:
  266                                                 newval[i].v4 =
  267                                                     conf->ops[i].value;
  268                                                 break;
  269                                         case 8:
  270                                                 newval[i].v8 =
  271                                                     conf->ops[i].value;
  272                                                 break;
  273                                         }
  274                                 }
  275                                 bcopy(conf, newconf,
  276                                     NG_PATCH_CONF_SIZE(conf->count));
  277                                 if (privp->val != NULL)
  278                                         free(privp->val, M_NETGRAPH);
  279                                 privp->val = newval;
  280                                 if (privp->config != NULL)
  281                                         free(privp->config, M_NETGRAPH);
  282                                 privp->config = newconf;
  283                         }
  284                         break;
  285                     }
  286                 case NGM_PATCH_GETCLR_STATS:
  287                         clear = 1;
  288                         /* FALLTHROUGH */
  289                 case NGM_PATCH_GET_STATS:
  290                         NG_MKRESPONSE(resp, msg, sizeof(struct ng_patch_stats),
  291                             M_WAIT);
  292                         bcopy(&(privp->stats), resp->data,
  293                             sizeof(struct ng_patch_stats));
  294                         if (clear == 0)
  295                                 break;
  296                         /* else FALLTHROUGH */
  297                 case NGM_PATCH_CLR_STATS:
  298                         bzero(&(privp->stats), sizeof(struct ng_patch_stats));
  299                         break;
  300                 default:
  301                         error = EINVAL;
  302                         break;
  303                 }
  304                 break;
  305         default:
  306                 error = EINVAL;
  307                 break;
  308         }
  309 
  310         NG_RESPOND_MSG(error, node, item, resp);
  311         NG_FREE_MSG(msg);
  312         return(error);
  313 }
  314 
  315 static void
  316 do_patch(priv_p privp, struct mbuf *m)
  317 {
  318         struct ng_patch_config *conf;
  319         uint64_t buf;
  320         int i, patched;
  321 
  322         conf = privp->config;
  323         patched = 0;
  324         for(i = 0; i < conf->count; i++) {
  325                 if (conf->ops[i].offset + conf->ops[i].length >
  326                     m->m_pkthdr.len)
  327                         continue;
  328 
  329                 /* for "=" operation we don't need to copy data from mbuf */
  330                 if (conf->ops[i].mode != NG_PATCH_MODE_SET) {
  331                         m_copydata(m, conf->ops[i].offset,
  332                             conf->ops[i].length, (caddr_t)&buf);
  333                 }
  334 
  335                 switch (conf->ops[i].length) {
  336                 case 1:
  337                         switch (conf->ops[i].mode) {
  338                         case NG_PATCH_MODE_SET:
  339                                 *((uint8_t *)&buf) = privp->val[i].v1;
  340                                 break;
  341                         case NG_PATCH_MODE_ADD:
  342                                 *((uint8_t *)&buf) += privp->val[i].v1;
  343                                 break;
  344                         case NG_PATCH_MODE_SUB:
  345                                 *((uint8_t *)&buf) -= privp->val[i].v1;
  346                                 break;
  347                         case NG_PATCH_MODE_MUL:
  348                                 *((uint8_t *)&buf) *= privp->val[i].v1;
  349                                 break;
  350                         case NG_PATCH_MODE_DIV:
  351                                 *((uint8_t *)&buf) /= privp->val[i].v1;
  352                                 break;
  353                         case NG_PATCH_MODE_NEG:
  354                                 *((int8_t *)&buf) = - *((int8_t *)&buf);
  355                                 break;
  356                         case NG_PATCH_MODE_AND:
  357                                 *((uint8_t *)&buf) &= privp->val[i].v1;
  358                                 break;
  359                         case NG_PATCH_MODE_OR:
  360                                 *((uint8_t *)&buf) |= privp->val[i].v1;
  361                                 break;
  362                         case NG_PATCH_MODE_XOR:
  363                                 *((uint8_t *)&buf) ^= privp->val[i].v1;
  364                                 break;
  365                         case NG_PATCH_MODE_SHL:
  366                                 *((uint8_t *)&buf) <<= privp->val[i].v1;
  367                                 break;
  368                         case NG_PATCH_MODE_SHR:
  369                                 *((uint8_t *)&buf) >>= privp->val[i].v1;
  370                                 break;
  371                         }
  372                         break;
  373                 case 2:
  374                         *((int16_t *)&buf) =  ntohs(*((int16_t *)&buf));
  375                         switch (conf->ops[i].mode) {
  376                         case NG_PATCH_MODE_SET:
  377                                 *((uint16_t *)&buf) = privp->val[i].v2;
  378                                 break;
  379                         case NG_PATCH_MODE_ADD:
  380                                 *((uint16_t *)&buf) += privp->val[i].v2;
  381                                 break;
  382                         case NG_PATCH_MODE_SUB:
  383                                 *((uint16_t *)&buf) -= privp->val[i].v2;
  384                                 break;
  385                         case NG_PATCH_MODE_MUL:
  386                                 *((uint16_t *)&buf) *= privp->val[i].v2;
  387                                 break;
  388                         case NG_PATCH_MODE_DIV:
  389                                 *((uint16_t *)&buf) /= privp->val[i].v2;
  390                                 break;
  391                         case NG_PATCH_MODE_NEG:
  392                                 *((int16_t *)&buf) = - *((int16_t *)&buf);
  393                                 break;
  394                         case NG_PATCH_MODE_AND:
  395                                 *((uint16_t *)&buf) &= privp->val[i].v2;
  396                                 break;
  397                         case NG_PATCH_MODE_OR:
  398                                 *((uint16_t *)&buf) |= privp->val[i].v2;
  399                                 break;
  400                         case NG_PATCH_MODE_XOR:
  401                                 *((uint16_t *)&buf) ^= privp->val[i].v2;
  402                                 break;
  403                         case NG_PATCH_MODE_SHL:
  404                                 *((uint16_t *)&buf) <<= privp->val[i].v2;
  405                                 break;
  406                         case NG_PATCH_MODE_SHR:
  407                                 *((uint16_t *)&buf) >>= privp->val[i].v2;
  408                                 break;
  409                         }
  410                         *((int16_t *)&buf) =  htons(*((int16_t *)&buf));
  411                         break;
  412                 case 4:
  413                         *((int32_t *)&buf) =  ntohl(*((int32_t *)&buf));
  414                         switch (conf->ops[i].mode) {
  415                         case NG_PATCH_MODE_SET:
  416                                 *((uint32_t *)&buf) = privp->val[i].v4;
  417                                 break;
  418                         case NG_PATCH_MODE_ADD:
  419                                 *((uint32_t *)&buf) += privp->val[i].v4;
  420                                 break;
  421                         case NG_PATCH_MODE_SUB:
  422                                 *((uint32_t *)&buf) -= privp->val[i].v4;
  423                                 break;
  424                         case NG_PATCH_MODE_MUL:
  425                                 *((uint32_t *)&buf) *= privp->val[i].v4;
  426                                 break;
  427                         case NG_PATCH_MODE_DIV:
  428                                 *((uint32_t *)&buf) /= privp->val[i].v4;
  429                                 break;
  430                         case NG_PATCH_MODE_NEG:
  431                                 *((int32_t *)&buf) = - *((int32_t *)&buf);
  432                                 break;
  433                         case NG_PATCH_MODE_AND:
  434                                 *((uint32_t *)&buf) &= privp->val[i].v4;
  435                                 break;
  436                         case NG_PATCH_MODE_OR:
  437                                 *((uint32_t *)&buf) |= privp->val[i].v4;
  438                                 break;
  439                         case NG_PATCH_MODE_XOR:
  440                                 *((uint32_t *)&buf) ^= privp->val[i].v4;
  441                                 break;
  442                         case NG_PATCH_MODE_SHL:
  443                                 *((uint32_t *)&buf) <<= privp->val[i].v4;
  444                                 break;
  445                         case NG_PATCH_MODE_SHR:
  446                                 *((uint32_t *)&buf) >>= privp->val[i].v4;
  447                                 break;
  448                         }
  449                         *((int32_t *)&buf) =  htonl(*((int32_t *)&buf));
  450                         break;
  451                 case 8:
  452                         *((int64_t *)&buf) =  be64toh(*((int64_t *)&buf));
  453                         switch (conf->ops[i].mode) {
  454                         case NG_PATCH_MODE_SET:
  455                                 *((uint64_t *)&buf) = privp->val[i].v8;
  456                                 break;
  457                         case NG_PATCH_MODE_ADD:
  458                                 *((uint64_t *)&buf) += privp->val[i].v8;
  459                                 break;
  460                         case NG_PATCH_MODE_SUB:
  461                                 *((uint64_t *)&buf) -= privp->val[i].v8;
  462                                 break;
  463                         case NG_PATCH_MODE_MUL:
  464                                 *((uint64_t *)&buf) *= privp->val[i].v8;
  465                                 break;
  466                         case NG_PATCH_MODE_DIV:
  467                                 *((uint64_t *)&buf) /= privp->val[i].v8;
  468                                 break;
  469                         case NG_PATCH_MODE_NEG:
  470                                 *((int64_t *)&buf) = - *((int64_t *)&buf);
  471                                 break;
  472                         case NG_PATCH_MODE_AND:
  473                                 *((uint64_t *)&buf) &= privp->val[i].v8;
  474                                 break;
  475                         case NG_PATCH_MODE_OR:
  476                                 *((uint64_t *)&buf) |= privp->val[i].v8;
  477                                 break;
  478                         case NG_PATCH_MODE_XOR:
  479                                 *((uint64_t *)&buf) ^= privp->val[i].v8;
  480                                 break;
  481                         case NG_PATCH_MODE_SHL:
  482                                 *((uint64_t *)&buf) <<= privp->val[i].v8;
  483                                 break;
  484                         case NG_PATCH_MODE_SHR:
  485                                 *((uint64_t *)&buf) >>= privp->val[i].v8;
  486                                 break;
  487                         }
  488                         *((int64_t *)&buf) =  htobe64(*((int64_t *)&buf));
  489                         break;
  490                 }
  491 
  492                 m_copyback(m, conf->ops[i].offset, conf->ops[i].length,
  493                     (caddr_t)&buf);
  494                 patched = 1;
  495         }
  496         if (patched > 0)
  497                 privp->stats.patched++;
  498 }
  499 
  500 static int
  501 ng_patch_rcvdata(hook_p hook, item_p item)
  502 {
  503         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  504         struct mbuf *m;
  505         hook_p target;
  506         int error;
  507 
  508         priv->stats.received++;
  509         NGI_GET_M(item, m);
  510         if (priv->config != NULL && hook == priv->in &&
  511             (m->m_flags & M_PKTHDR) != 0) {
  512                 m = m_unshare(m,M_NOWAIT);
  513                 if (m == NULL) {
  514                         priv->stats.dropped++;
  515                         NG_FREE_ITEM(item);
  516                         return (ENOMEM);
  517                 }
  518                 do_patch(priv, m);
  519                 m->m_flags |= priv->config->csum_flags;
  520         }
  521 
  522         target = NULL;
  523         if (hook == priv->in) {
  524                 /* return frames on 'in' hook if 'out' not connected */
  525                 if (priv->out != NULL)
  526                         target = priv->out;
  527                 else
  528                         target = priv->in;
  529         }
  530         if (hook == priv->out && priv->in != NULL)
  531                 target = priv->in;
  532 
  533         if (target == NULL) {
  534                 priv->stats.dropped++;
  535                 NG_FREE_ITEM(item);
  536                 NG_FREE_M(m);
  537                 return (0);
  538         }
  539         NG_FWD_NEW_DATA(error, item, target, m);
  540         return (error);
  541 }
  542 
  543 static int
  544 ng_patch_shutdown(node_p node)
  545 {
  546         const priv_p privdata = NG_NODE_PRIVATE(node);
  547 
  548         if (privdata->val != NULL)
  549                 free(privdata->val, M_NETGRAPH);
  550         if (privdata->config != NULL)
  551                 free(privdata->config, M_NETGRAPH);
  552         NG_NODE_SET_PRIVATE(node, NULL);
  553         NG_NODE_UNREF(node);
  554         free(privdata, M_NETGRAPH);
  555         return (0);
  556 }
  557 
  558 static int
  559 ng_patch_disconnect(hook_p hook)
  560 {
  561         priv_p priv;
  562 
  563         priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  564         if (hook == priv->in) {
  565                 priv->in = NULL;
  566         }
  567         if (hook == priv->out) {
  568                 priv->out = NULL;
  569         }
  570         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
  571             NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) /* already shutting down? */
  572                 ng_rmnode_self(NG_HOOK_NODE(hook));
  573         return (0);
  574 }
  575 

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