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  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/10.4/sys/netgraph/ng_patch.c 309389 2016-12-02 05:42:04Z julian $");
   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 *conf;
   54 
   55         conf = (const struct ng_patch_config *)(buf -
   56             offsetof(struct ng_patch_config, ops));
   57 
   58         return (conf->count);
   59 }
   60 
   61 static const struct ng_parse_struct_field ng_patch_op_type_fields[]
   62         = NG_PATCH_OP_TYPE_INFO;
   63 static const struct ng_parse_type ng_patch_op_type = {
   64         &ng_parse_struct_type,
   65         &ng_patch_op_type_fields
   66 };
   67 
   68 static const struct ng_parse_array_info ng_patch_ops_array_info = {
   69         &ng_patch_op_type,
   70         &ng_patch_config_getlen
   71 };
   72 static const struct ng_parse_type ng_patch_ops_array_type = {
   73         &ng_parse_array_type,
   74         &ng_patch_ops_array_info
   75 };
   76 
   77 static const struct ng_parse_struct_field ng_patch_config_type_fields[]
   78         = NG_PATCH_CONFIG_TYPE_INFO;
   79 static const struct ng_parse_type ng_patch_config_type = {
   80         &ng_parse_struct_type,
   81         &ng_patch_config_type_fields
   82 };
   83 
   84 static const struct ng_parse_struct_field ng_patch_stats_fields[]
   85         = NG_PATCH_STATS_TYPE_INFO;
   86 static const struct ng_parse_type ng_patch_stats_type = {
   87         &ng_parse_struct_type,
   88         &ng_patch_stats_fields
   89 };
   90 
   91 static const struct ng_cmdlist ng_patch_cmdlist[] = {
   92         {
   93                 NGM_PATCH_COOKIE,
   94                 NGM_PATCH_GETCONFIG,
   95                 "getconfig",
   96                 NULL,
   97                 &ng_patch_config_type
   98         },
   99         {
  100                 NGM_PATCH_COOKIE,
  101                 NGM_PATCH_SETCONFIG,
  102                 "setconfig",
  103                 &ng_patch_config_type,
  104                 NULL
  105         },
  106         {
  107                 NGM_PATCH_COOKIE,
  108                 NGM_PATCH_GET_STATS,
  109                 "getstats",
  110                 NULL,
  111                 &ng_patch_stats_type
  112         },
  113         {
  114                 NGM_PATCH_COOKIE,
  115                 NGM_PATCH_CLR_STATS,
  116                 "clrstats",
  117                 NULL,
  118                 NULL
  119         },
  120         {
  121                 NGM_PATCH_COOKIE,
  122                 NGM_PATCH_GETCLR_STATS,
  123                 "getclrstats",
  124                 NULL,
  125                 &ng_patch_stats_type
  126         },
  127         { 0 }
  128 };
  129 
  130 static struct ng_type typestruct = {
  131         .version =      NG_ABI_VERSION,
  132         .name =         NG_PATCH_NODE_TYPE,
  133         .constructor =  ng_patch_constructor,
  134         .rcvmsg =       ng_patch_rcvmsg,
  135         .shutdown =     ng_patch_shutdown,
  136         .newhook =      ng_patch_newhook,
  137         .rcvdata =      ng_patch_rcvdata,
  138         .disconnect =   ng_patch_disconnect,
  139         .cmdlist =      ng_patch_cmdlist,
  140 };
  141 
  142 NETGRAPH_INIT(patch, &typestruct);
  143 
  144 union patch_val {
  145         uint8_t         v1;
  146         uint16_t        v2;
  147         uint32_t        v4;
  148         uint64_t        v8;
  149 };
  150 
  151 /* private data */
  152 struct ng_patch_priv {
  153         hook_p          in;
  154         hook_p          out;
  155         struct ng_patch_config *config;
  156         union patch_val *val;
  157         struct ng_patch_stats stats;
  158 };
  159 typedef struct ng_patch_priv *priv_p;
  160 
  161 #define NG_PATCH_CONF_SIZE(count)       (sizeof(struct ng_patch_config) + \
  162                 (count) * sizeof(struct ng_patch_op))
  163 
  164 static void do_patch(priv_p conf, struct mbuf *m);
  165 
  166 static int
  167 ng_patch_constructor(node_p node)
  168 {
  169         priv_p privdata;
  170 
  171         privdata = malloc(sizeof(*privdata), M_NETGRAPH, M_WAITOK | M_ZERO);
  172         NG_NODE_SET_PRIVATE(node, privdata);
  173         privdata->in = NULL;
  174         privdata->out = NULL;
  175         privdata->config = NULL;
  176         return (0);
  177 }
  178 
  179 static int
  180 ng_patch_newhook(node_p node, hook_p hook, const char *name)
  181 {
  182         const priv_p privp = NG_NODE_PRIVATE(node);
  183 
  184         if (strncmp(name, NG_PATCH_HOOK_IN, strlen(NG_PATCH_HOOK_IN)) == 0) {
  185                 privp->in = hook;
  186         } else if (strncmp(name, NG_PATCH_HOOK_OUT,
  187             strlen(NG_PATCH_HOOK_OUT)) == 0) {
  188                 privp->out = hook;
  189         } else
  190                 return (EINVAL);
  191         return(0);
  192 }
  193 
  194 static int
  195 ng_patch_rcvmsg(node_p node, item_p item, hook_p lasthook)
  196 {
  197         const priv_p privp = NG_NODE_PRIVATE(node);
  198         struct ng_patch_config *conf, *newconf;
  199         union patch_val *newval;
  200         struct ng_mesg *msg;
  201         struct ng_mesg *resp;
  202         int i, clear, error;
  203 
  204         clear = error = 0;
  205         resp = NULL;
  206         NGI_GET_MSG(item, msg);
  207         switch (msg->header.typecookie) {
  208         case NGM_PATCH_COOKIE:
  209                 switch (msg->header.cmd) {
  210                 case NGM_PATCH_GETCONFIG:
  211                         if (privp->config == NULL)
  212                                 break;
  213                         NG_MKRESPONSE(resp, msg,
  214                             NG_PATCH_CONF_SIZE(privp->config->count),
  215                             M_WAITOK);
  216                         bcopy(privp->config, resp->data,
  217                             NG_PATCH_CONF_SIZE(privp->config->count));
  218                         break;
  219                 case NGM_PATCH_SETCONFIG:
  220                     {
  221                         if (msg->header.arglen <
  222                             sizeof(struct ng_patch_config)) {
  223                                 error = EINVAL;
  224                                 break;
  225                         }
  226 
  227                         conf = (struct ng_patch_config *)msg->data;
  228                         if (msg->header.arglen <
  229                             NG_PATCH_CONF_SIZE(conf->count)) {
  230                                 error = EINVAL;
  231                                 break;
  232                         }
  233 
  234                         for(i = 0; i < conf->count; i++) {
  235                                 switch(conf->ops[i].length) {
  236                                 case 1:
  237                                 case 2:
  238                                 case 4:
  239                                 case 8:
  240                                         break;
  241                                 default:
  242                                         error = EINVAL;
  243                                         break;
  244                                 }
  245                                 if (error != 0)
  246                                         break;
  247                         }
  248 
  249                         conf->csum_flags &= CSUM_IP | CSUM_TCP | CSUM_UDP |
  250                             CSUM_SCTP;
  251 
  252                         if (error == 0) {
  253                                 newconf = malloc(
  254                                     NG_PATCH_CONF_SIZE(conf->count),
  255                                     M_NETGRAPH, M_WAITOK);
  256                                 newval = malloc(conf->count *
  257                                     sizeof(union patch_val), M_NETGRAPH,
  258                                     M_WAITOK);
  259                                 for(i = 0; i < conf->count; i++) {
  260                                         switch (conf->ops[i].length) {
  261                                         case 1:
  262                                                 newval[i].v1 =
  263                                                     conf->ops[i].value;
  264                                                 break;
  265                                         case 2:
  266                                                 newval[i].v2 =
  267                                                     conf->ops[i].value;
  268                                                 break;
  269                                         case 4:
  270                                                 newval[i].v4 =
  271                                                     conf->ops[i].value;
  272                                                 break;
  273                                         case 8:
  274                                                 newval[i].v8 =
  275                                                     conf->ops[i].value;
  276                                                 break;
  277                                         }
  278                                 }
  279                                 bcopy(conf, newconf,
  280                                     NG_PATCH_CONF_SIZE(conf->count));
  281                                 if (privp->val != NULL)
  282                                         free(privp->val, M_NETGRAPH);
  283                                 privp->val = newval;
  284                                 if (privp->config != NULL)
  285                                         free(privp->config, M_NETGRAPH);
  286                                 privp->config = newconf;
  287                         }
  288                         break;
  289                     }
  290                 case NGM_PATCH_GETCLR_STATS:
  291                         clear = 1;
  292                         /* FALLTHROUGH */
  293                 case NGM_PATCH_GET_STATS:
  294                         NG_MKRESPONSE(resp, msg, sizeof(struct ng_patch_stats),
  295                             M_WAITOK);
  296                         bcopy(&(privp->stats), resp->data,
  297                             sizeof(struct ng_patch_stats));
  298                         if (clear == 0)
  299                                 break;
  300                         /* else FALLTHROUGH */
  301                 case NGM_PATCH_CLR_STATS:
  302                         bzero(&(privp->stats), sizeof(struct ng_patch_stats));
  303                         break;
  304                 default:
  305                         error = EINVAL;
  306                         break;
  307                 }
  308                 break;
  309         default:
  310                 error = EINVAL;
  311                 break;
  312         }
  313 
  314         NG_RESPOND_MSG(error, node, item, resp);
  315         NG_FREE_MSG(msg);
  316         return(error);
  317 }
  318 
  319 static void
  320 do_patch(priv_p privp, struct mbuf *m)
  321 {
  322         struct ng_patch_config *conf;
  323         uint64_t buf;
  324         int i, patched;
  325 
  326         conf = privp->config;
  327         patched = 0;
  328         for(i = 0; i < conf->count; i++) {
  329                 if (conf->ops[i].offset + conf->ops[i].length >
  330                     m->m_pkthdr.len)
  331                         continue;
  332 
  333                 /* for "=" operation we don't need to copy data from mbuf */
  334                 if (conf->ops[i].mode != NG_PATCH_MODE_SET) {
  335                         m_copydata(m, conf->ops[i].offset,
  336                             conf->ops[i].length, (caddr_t)&buf);
  337                 }
  338 
  339                 switch (conf->ops[i].length) {
  340                 case 1:
  341                         switch (conf->ops[i].mode) {
  342                         case NG_PATCH_MODE_SET:
  343                                 *((uint8_t *)&buf) = privp->val[i].v1;
  344                                 break;
  345                         case NG_PATCH_MODE_ADD:
  346                                 *((uint8_t *)&buf) += privp->val[i].v1;
  347                                 break;
  348                         case NG_PATCH_MODE_SUB:
  349                                 *((uint8_t *)&buf) -= privp->val[i].v1;
  350                                 break;
  351                         case NG_PATCH_MODE_MUL:
  352                                 *((uint8_t *)&buf) *= privp->val[i].v1;
  353                                 break;
  354                         case NG_PATCH_MODE_DIV:
  355                                 *((uint8_t *)&buf) /= privp->val[i].v1;
  356                                 break;
  357                         case NG_PATCH_MODE_NEG:
  358                                 *((int8_t *)&buf) = - *((int8_t *)&buf);
  359                                 break;
  360                         case NG_PATCH_MODE_AND:
  361                                 *((uint8_t *)&buf) &= privp->val[i].v1;
  362                                 break;
  363                         case NG_PATCH_MODE_OR:
  364                                 *((uint8_t *)&buf) |= privp->val[i].v1;
  365                                 break;
  366                         case NG_PATCH_MODE_XOR:
  367                                 *((uint8_t *)&buf) ^= privp->val[i].v1;
  368                                 break;
  369                         case NG_PATCH_MODE_SHL:
  370                                 *((uint8_t *)&buf) <<= privp->val[i].v1;
  371                                 break;
  372                         case NG_PATCH_MODE_SHR:
  373                                 *((uint8_t *)&buf) >>= privp->val[i].v1;
  374                                 break;
  375                         }
  376                         break;
  377                 case 2:
  378                         *((int16_t *)&buf) =  ntohs(*((int16_t *)&buf));
  379                         switch (conf->ops[i].mode) {
  380                         case NG_PATCH_MODE_SET:
  381                                 *((uint16_t *)&buf) = privp->val[i].v2;
  382                                 break;
  383                         case NG_PATCH_MODE_ADD:
  384                                 *((uint16_t *)&buf) += privp->val[i].v2;
  385                                 break;
  386                         case NG_PATCH_MODE_SUB:
  387                                 *((uint16_t *)&buf) -= privp->val[i].v2;
  388                                 break;
  389                         case NG_PATCH_MODE_MUL:
  390                                 *((uint16_t *)&buf) *= privp->val[i].v2;
  391                                 break;
  392                         case NG_PATCH_MODE_DIV:
  393                                 *((uint16_t *)&buf) /= privp->val[i].v2;
  394                                 break;
  395                         case NG_PATCH_MODE_NEG:
  396                                 *((int16_t *)&buf) = - *((int16_t *)&buf);
  397                                 break;
  398                         case NG_PATCH_MODE_AND:
  399                                 *((uint16_t *)&buf) &= privp->val[i].v2;
  400                                 break;
  401                         case NG_PATCH_MODE_OR:
  402                                 *((uint16_t *)&buf) |= privp->val[i].v2;
  403                                 break;
  404                         case NG_PATCH_MODE_XOR:
  405                                 *((uint16_t *)&buf) ^= privp->val[i].v2;
  406                                 break;
  407                         case NG_PATCH_MODE_SHL:
  408                                 *((uint16_t *)&buf) <<= privp->val[i].v2;
  409                                 break;
  410                         case NG_PATCH_MODE_SHR:
  411                                 *((uint16_t *)&buf) >>= privp->val[i].v2;
  412                                 break;
  413                         }
  414                         *((int16_t *)&buf) =  htons(*((int16_t *)&buf));
  415                         break;
  416                 case 4:
  417                         *((int32_t *)&buf) =  ntohl(*((int32_t *)&buf));
  418                         switch (conf->ops[i].mode) {
  419                         case NG_PATCH_MODE_SET:
  420                                 *((uint32_t *)&buf) = privp->val[i].v4;
  421                                 break;
  422                         case NG_PATCH_MODE_ADD:
  423                                 *((uint32_t *)&buf) += privp->val[i].v4;
  424                                 break;
  425                         case NG_PATCH_MODE_SUB:
  426                                 *((uint32_t *)&buf) -= privp->val[i].v4;
  427                                 break;
  428                         case NG_PATCH_MODE_MUL:
  429                                 *((uint32_t *)&buf) *= privp->val[i].v4;
  430                                 break;
  431                         case NG_PATCH_MODE_DIV:
  432                                 *((uint32_t *)&buf) /= privp->val[i].v4;
  433                                 break;
  434                         case NG_PATCH_MODE_NEG:
  435                                 *((int32_t *)&buf) = - *((int32_t *)&buf);
  436                                 break;
  437                         case NG_PATCH_MODE_AND:
  438                                 *((uint32_t *)&buf) &= privp->val[i].v4;
  439                                 break;
  440                         case NG_PATCH_MODE_OR:
  441                                 *((uint32_t *)&buf) |= privp->val[i].v4;
  442                                 break;
  443                         case NG_PATCH_MODE_XOR:
  444                                 *((uint32_t *)&buf) ^= privp->val[i].v4;
  445                                 break;
  446                         case NG_PATCH_MODE_SHL:
  447                                 *((uint32_t *)&buf) <<= privp->val[i].v4;
  448                                 break;
  449                         case NG_PATCH_MODE_SHR:
  450                                 *((uint32_t *)&buf) >>= privp->val[i].v4;
  451                                 break;
  452                         }
  453                         *((int32_t *)&buf) =  htonl(*((int32_t *)&buf));
  454                         break;
  455                 case 8:
  456                         *((int64_t *)&buf) =  be64toh(*((int64_t *)&buf));
  457                         switch (conf->ops[i].mode) {
  458                         case NG_PATCH_MODE_SET:
  459                                 *((uint64_t *)&buf) = privp->val[i].v8;
  460                                 break;
  461                         case NG_PATCH_MODE_ADD:
  462                                 *((uint64_t *)&buf) += privp->val[i].v8;
  463                                 break;
  464                         case NG_PATCH_MODE_SUB:
  465                                 *((uint64_t *)&buf) -= privp->val[i].v8;
  466                                 break;
  467                         case NG_PATCH_MODE_MUL:
  468                                 *((uint64_t *)&buf) *= privp->val[i].v8;
  469                                 break;
  470                         case NG_PATCH_MODE_DIV:
  471                                 *((uint64_t *)&buf) /= privp->val[i].v8;
  472                                 break;
  473                         case NG_PATCH_MODE_NEG:
  474                                 *((int64_t *)&buf) = - *((int64_t *)&buf);
  475                                 break;
  476                         case NG_PATCH_MODE_AND:
  477                                 *((uint64_t *)&buf) &= privp->val[i].v8;
  478                                 break;
  479                         case NG_PATCH_MODE_OR:
  480                                 *((uint64_t *)&buf) |= privp->val[i].v8;
  481                                 break;
  482                         case NG_PATCH_MODE_XOR:
  483                                 *((uint64_t *)&buf) ^= privp->val[i].v8;
  484                                 break;
  485                         case NG_PATCH_MODE_SHL:
  486                                 *((uint64_t *)&buf) <<= privp->val[i].v8;
  487                                 break;
  488                         case NG_PATCH_MODE_SHR:
  489                                 *((uint64_t *)&buf) >>= privp->val[i].v8;
  490                                 break;
  491                         }
  492                         *((int64_t *)&buf) =  htobe64(*((int64_t *)&buf));
  493                         break;
  494                 }
  495 
  496                 m_copyback(m, conf->ops[i].offset, conf->ops[i].length,
  497                     (caddr_t)&buf);
  498                 patched = 1;
  499         }
  500         if (patched > 0)
  501                 privp->stats.patched++;
  502 }
  503 
  504 static int
  505 ng_patch_rcvdata(hook_p hook, item_p item)
  506 {
  507         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  508         struct mbuf *m;
  509         hook_p target;
  510         int error;
  511 
  512         priv->stats.received++;
  513         NGI_GET_M(item, m);
  514         if (priv->config != NULL && hook == priv->in &&
  515             (m->m_flags & M_PKTHDR) != 0) {
  516                 m = m_unshare(m,M_NOWAIT);
  517                 if (m == NULL) {
  518                         priv->stats.dropped++;
  519                         NG_FREE_ITEM(item);
  520                         return (ENOMEM);
  521                 }
  522                 do_patch(priv, m);
  523                 m->m_pkthdr.csum_flags |= priv->config->csum_flags;
  524         }
  525 
  526         target = NULL;
  527         if (hook == priv->in) {
  528                 /* return frames on 'in' hook if 'out' not connected */
  529                 if (priv->out != NULL)
  530                         target = priv->out;
  531                 else
  532                         target = priv->in;
  533         }
  534         if (hook == priv->out && priv->in != NULL)
  535                 target = priv->in;
  536 
  537         if (target == NULL) {
  538                 priv->stats.dropped++;
  539                 NG_FREE_ITEM(item);
  540                 NG_FREE_M(m);
  541                 return (0);
  542         }
  543         NG_FWD_NEW_DATA(error, item, target, m);
  544         return (error);
  545 }
  546 
  547 static int
  548 ng_patch_shutdown(node_p node)
  549 {
  550         const priv_p privdata = NG_NODE_PRIVATE(node);
  551 
  552         if (privdata->val != NULL)
  553                 free(privdata->val, M_NETGRAPH);
  554         if (privdata->config != NULL)
  555                 free(privdata->config, M_NETGRAPH);
  556         NG_NODE_SET_PRIVATE(node, NULL);
  557         NG_NODE_UNREF(node);
  558         free(privdata, M_NETGRAPH);
  559         return (0);
  560 }
  561 
  562 static int
  563 ng_patch_disconnect(hook_p hook)
  564 {
  565         priv_p priv;
  566 
  567         priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  568         if (hook == priv->in) {
  569                 priv->in = NULL;
  570         }
  571         if (hook == priv->out) {
  572                 priv->out = NULL;
  573         }
  574         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
  575             NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) /* already shutting down? */
  576                 ng_rmnode_self(NG_HOOK_NODE(hook));
  577         return (0);
  578 }
  579 

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