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/*-
* Copyright (C) 2010 by Maxim Ignatenko <gelraen.ua@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/netgraph/ng_patch.c 234681 2012-04-25 09:55:34Z melifaro $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/endian.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <netgraph/ng_message.h>
#include <netgraph/ng_parse.h>
#include <netgraph/ng_patch.h>
#include <netgraph/netgraph.h>
static ng_constructor_t ng_patch_constructor;
static ng_rcvmsg_t ng_patch_rcvmsg;
static ng_shutdown_t ng_patch_shutdown;
static ng_newhook_t ng_patch_newhook;
static ng_rcvdata_t ng_patch_rcvdata;
static ng_disconnect_t ng_patch_disconnect;
static int
ng_patch_config_getlen(const struct ng_parse_type *type,
const u_char *start, const u_char *buf)
{
const struct ng_patch_config *p;
p = (const struct ng_patch_config *)(buf -
offsetof(struct ng_patch_config, ops));
return (p->count);
}
static const struct ng_parse_struct_field ng_patch_op_type_fields[]
= NG_PATCH_OP_TYPE_INFO;
static const struct ng_parse_type ng_patch_op_type = {
&ng_parse_struct_type,
&ng_patch_op_type_fields
};
static const struct ng_parse_array_info ng_patch_confarr_info = {
&ng_patch_op_type,
&ng_patch_config_getlen
};
static const struct ng_parse_type ng_patch_confarr_type = {
&ng_parse_array_type,
&ng_patch_confarr_info
};
static const struct ng_parse_struct_field ng_patch_config_type_fields[]
= NG_PATCH_CONFIG_TYPE_INFO;
static const struct ng_parse_type ng_patch_config_type = {
&ng_parse_struct_type,
&ng_patch_config_type_fields
};
static const struct ng_parse_struct_field ng_patch_stats_fields[]
= NG_PATCH_STATS_TYPE_INFO;
static const struct ng_parse_type ng_patch_stats_type = {
&ng_parse_struct_type,
&ng_patch_stats_fields
};
static const struct ng_cmdlist ng_patch_cmdlist[] = {
{
NGM_PATCH_COOKIE,
NGM_PATCH_GETCONFIG,
"getconfig",
NULL,
&ng_patch_config_type
},
{
NGM_PATCH_COOKIE,
NGM_PATCH_SETCONFIG,
"setconfig",
&ng_patch_config_type,
NULL
},
{
NGM_PATCH_COOKIE,
NGM_PATCH_GET_STATS,
"getstats",
NULL,
&ng_patch_stats_type
},
{
NGM_PATCH_COOKIE,
NGM_PATCH_CLR_STATS,
"clrstats",
NULL,
NULL
},
{
NGM_PATCH_COOKIE,
NGM_PATCH_GETCLR_STATS,
"getclrstats",
NULL,
&ng_patch_stats_type
},
{ 0 }
};
static struct ng_type typestruct = {
.version = NG_ABI_VERSION,
.name = NG_PATCH_NODE_TYPE,
.constructor = ng_patch_constructor,
.rcvmsg = ng_patch_rcvmsg,
.shutdown = ng_patch_shutdown,
.newhook = ng_patch_newhook,
.rcvdata = ng_patch_rcvdata,
.disconnect = ng_patch_disconnect,
.cmdlist = ng_patch_cmdlist,
};
NETGRAPH_INIT(patch, &typestruct);
union patch_val {
uint8_t v1;
uint16_t v2;
uint32_t v4;
uint64_t v8;
};
struct ng_patch_priv {
hook_p in;
hook_p out;
struct ng_patch_config *config;
union patch_val *val;
struct ng_patch_stats stats;
};
typedef struct ng_patch_priv *priv_p;
#define NG_PATCH_CONF_SIZE(count) (sizeof(struct ng_patch_config) + \
(count) * sizeof(struct ng_patch_op))
static void do_patch(priv_p conf, struct mbuf *m);
static int
ng_patch_constructor(node_p node)
{
priv_p privdata;
privdata = malloc(sizeof(*privdata), M_NETGRAPH, M_WAITOK | M_ZERO);
NG_NODE_SET_PRIVATE(node, privdata);
privdata->in = NULL;
privdata->out = NULL;
privdata->config = NULL;
return (0);
}
static int
ng_patch_newhook(node_p node, hook_p hook, const char *name)
{
const priv_p privp = NG_NODE_PRIVATE(node);
if (strncmp(name, NG_PATCH_HOOK_IN, strlen(NG_PATCH_HOOK_IN)) == 0) {
privp->in = hook;
} else if (strncmp(name, NG_PATCH_HOOK_OUT,
strlen(NG_PATCH_HOOK_OUT)) == 0) {
privp->out = hook;
} else
return (EINVAL);
return(0);
}
static int
ng_patch_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
const priv_p privp = NG_NODE_PRIVATE(node);
struct ng_patch_config *conf, *newconf;
union patch_val *newval;
struct ng_mesg *msg;
struct ng_mesg *resp;
int i, clear, error;
clear = error = 0;
resp = NULL;
NGI_GET_MSG(item, msg);
switch (msg->header.typecookie) {
case NGM_PATCH_COOKIE:
switch (msg->header.cmd) {
case NGM_PATCH_GETCONFIG:
if (privp->config == NULL)
break;
NG_MKRESPONSE(resp, msg,
NG_PATCH_CONF_SIZE(privp->config->count),
M_WAITOK);
bcopy(privp->config, resp->data,
NG_PATCH_CONF_SIZE(privp->config->count));
break;
case NGM_PATCH_SETCONFIG:
{
if (msg->header.arglen <
sizeof(struct ng_patch_config)) {
error = EINVAL;
break;
}
conf = (struct ng_patch_config *)msg->data;
if (msg->header.arglen <
NG_PATCH_CONF_SIZE(conf->count)) {
error = EINVAL;
break;
}
for(i = 0; i < conf->count; i++) {
switch(conf->ops[i].length) {
case 1:
case 2:
case 4:
case 8:
break;
default:
error = EINVAL;
break;
}
if (error != 0)
break;
}
conf->csum_flags &= CSUM_IP | CSUM_TCP | CSUM_UDP |
CSUM_SCTP;
if (error == 0) {
newconf = malloc(
NG_PATCH_CONF_SIZE(conf->count),
M_NETGRAPH, M_WAITOK);
newval = malloc(conf->count *
sizeof(union patch_val), M_NETGRAPH,
M_WAITOK);
for(i = 0; i < conf->count; i++) {
switch (conf->ops[i].length) {
case 1:
newval[i].v1 =
conf->ops[i].value;
break;
case 2:
newval[i].v2 =
conf->ops[i].value;
break;
case 4:
newval[i].v4 =
conf->ops[i].value;
break;
case 8:
newval[i].v8 =
conf->ops[i].value;
break;
}
}
bcopy(conf, newconf,
NG_PATCH_CONF_SIZE(conf->count));
if (privp->val != NULL)
free(privp->val, M_NETGRAPH);
privp->val = newval;
if (privp->config != NULL)
free(privp->config, M_NETGRAPH);
privp->config = newconf;
}
break;
}
case NGM_PATCH_GETCLR_STATS:
clear = 1;
/* FALLTHROUGH */
case NGM_PATCH_GET_STATS:
NG_MKRESPONSE(resp, msg, sizeof(struct ng_patch_stats),
M_WAITOK);
bcopy(&(privp->stats), resp->data,
sizeof(struct ng_patch_stats));
if (clear == 0)
break;
/* else FALLTHROUGH */
case NGM_PATCH_CLR_STATS:
bzero(&(privp->stats), sizeof(struct ng_patch_stats));
break;
default:
error = EINVAL;
break;
}
break;
default:
error = EINVAL;
break;
}
NG_RESPOND_MSG(error, node, item, resp);
NG_FREE_MSG(msg);
return(error);
}
static void
do_patch(priv_p privp, struct mbuf *m)
{
struct ng_patch_config *conf;
uint64_t buf;
int i, patched;
conf = privp->config;
patched = 0;
for(i = 0; i < conf->count; i++) {
if (conf->ops[i].offset + conf->ops[i].length >
m->m_pkthdr.len)
continue;
/* for "=" operation we don't need to copy data from mbuf */
if (conf->ops[i].mode != NG_PATCH_MODE_SET) {
m_copydata(m, conf->ops[i].offset,
conf->ops[i].length, (caddr_t)&buf);
}
switch (conf->ops[i].length) {
case 1:
switch (conf->ops[i].mode) {
case NG_PATCH_MODE_SET:
*((uint8_t *)&buf) = privp->val[i].v1;
break;
case NG_PATCH_MODE_ADD:
*((uint8_t *)&buf) += privp->val[i].v1;
break;
case NG_PATCH_MODE_SUB:
*((uint8_t *)&buf) -= privp->val[i].v1;
break;
case NG_PATCH_MODE_MUL:
*((uint8_t *)&buf) *= privp->val[i].v1;
break;
case NG_PATCH_MODE_DIV:
*((uint8_t *)&buf) /= privp->val[i].v1;
break;
case NG_PATCH_MODE_NEG:
*((int8_t *)&buf) = - *((int8_t *)&buf);
break;
case NG_PATCH_MODE_AND:
*((uint8_t *)&buf) &= privp->val[i].v1;
break;
case NG_PATCH_MODE_OR:
*((uint8_t *)&buf) |= privp->val[i].v1;
break;
case NG_PATCH_MODE_XOR:
*((uint8_t *)&buf) ^= privp->val[i].v1;
break;
case NG_PATCH_MODE_SHL:
*((uint8_t *)&buf) <<= privp->val[i].v1;
break;
case NG_PATCH_MODE_SHR:
*((uint8_t *)&buf) >>= privp->val[i].v1;
break;
}
break;
case 2:
*((int16_t *)&buf) = ntohs(*((int16_t *)&buf));
switch (conf->ops[i].mode) {
case NG_PATCH_MODE_SET:
*((uint16_t *)&buf) = privp->val[i].v2;
break;
case NG_PATCH_MODE_ADD:
*((uint16_t *)&buf) += privp->val[i].v2;
break;
case NG_PATCH_MODE_SUB:
*((uint16_t *)&buf) -= privp->val[i].v2;
break;
case NG_PATCH_MODE_MUL:
*((uint16_t *)&buf) *= privp->val[i].v2;
break;
case NG_PATCH_MODE_DIV:
*((uint16_t *)&buf) /= privp->val[i].v2;
break;
case NG_PATCH_MODE_NEG:
*((int16_t *)&buf) = - *((int16_t *)&buf);
break;
case NG_PATCH_MODE_AND:
*((uint16_t *)&buf) &= privp->val[i].v2;
break;
case NG_PATCH_MODE_OR:
*((uint16_t *)&buf) |= privp->val[i].v2;
break;
case NG_PATCH_MODE_XOR:
*((uint16_t *)&buf) ^= privp->val[i].v2;
break;
case NG_PATCH_MODE_SHL:
*((uint16_t *)&buf) <<= privp->val[i].v2;
break;
case NG_PATCH_MODE_SHR:
*((uint16_t *)&buf) >>= privp->val[i].v2;
break;
}
*((int16_t *)&buf) = htons(*((int16_t *)&buf));
break;
case 4:
*((int32_t *)&buf) = ntohl(*((int32_t *)&buf));
switch (conf->ops[i].mode) {
case NG_PATCH_MODE_SET:
*((uint32_t *)&buf) = privp->val[i].v4;
break;
case NG_PATCH_MODE_ADD:
*((uint32_t *)&buf) += privp->val[i].v4;
break;
case NG_PATCH_MODE_SUB:
*((uint32_t *)&buf) -= privp->val[i].v4;
break;
case NG_PATCH_MODE_MUL:
*((uint32_t *)&buf) *= privp->val[i].v4;
break;
case NG_PATCH_MODE_DIV:
*((uint32_t *)&buf) /= privp->val[i].v4;
break;
case NG_PATCH_MODE_NEG:
*((int32_t *)&buf) = - *((int32_t *)&buf);
break;
case NG_PATCH_MODE_AND:
*((uint32_t *)&buf) &= privp->val[i].v4;
break;
case NG_PATCH_MODE_OR:
*((uint32_t *)&buf) |= privp->val[i].v4;
break;
case NG_PATCH_MODE_XOR:
*((uint32_t *)&buf) ^= privp->val[i].v4;
break;
case NG_PATCH_MODE_SHL:
*((uint32_t *)&buf) <<= privp->val[i].v4;
break;
case NG_PATCH_MODE_SHR:
*((uint32_t *)&buf) >>= privp->val[i].v4;
break;
}
*((int32_t *)&buf) = htonl(*((int32_t *)&buf));
break;
case 8:
*((int64_t *)&buf) = be64toh(*((int64_t *)&buf));
switch (conf->ops[i].mode) {
case NG_PATCH_MODE_SET:
*((uint64_t *)&buf) = privp->val[i].v8;
break;
case NG_PATCH_MODE_ADD:
*((uint64_t *)&buf) += privp->val[i].v8;
break;
case NG_PATCH_MODE_SUB:
*((uint64_t *)&buf) -= privp->val[i].v8;
break;
case NG_PATCH_MODE_MUL:
*((uint64_t *)&buf) *= privp->val[i].v8;
break;
case NG_PATCH_MODE_DIV:
*((uint64_t *)&buf) /= privp->val[i].v8;
break;
case NG_PATCH_MODE_NEG:
*((int64_t *)&buf) = - *((int64_t *)&buf);
break;
case NG_PATCH_MODE_AND:
*((uint64_t *)&buf) &= privp->val[i].v8;
break;
case NG_PATCH_MODE_OR:
*((uint64_t *)&buf) |= privp->val[i].v8;
break;
case NG_PATCH_MODE_XOR:
*((uint64_t *)&buf) ^= privp->val[i].v8;
break;
case NG_PATCH_MODE_SHL:
*((uint64_t *)&buf) <<= privp->val[i].v8;
break;
case NG_PATCH_MODE_SHR:
*((uint64_t *)&buf) >>= privp->val[i].v8;
break;
}
*((int64_t *)&buf) = htobe64(*((int64_t *)&buf));
break;
}
m_copyback(m, conf->ops[i].offset, conf->ops[i].length,
(caddr_t)&buf);
patched = 1;
}
if (patched > 0)
privp->stats.patched++;
}
static int
ng_patch_rcvdata(hook_p hook, item_p item)
{
const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct mbuf *m;
hook_p target;
int error;
priv->stats.received++;
NGI_GET_M(item, m);
if (priv->config != NULL && hook == priv->in &&
(m->m_flags & M_PKTHDR) != 0) {
m = m_unshare(m,M_NOWAIT);
if (m == NULL) {
priv->stats.dropped++;
NG_FREE_ITEM(item);
return (ENOMEM);
}
do_patch(priv, m);
m->m_pkthdr.csum_flags |= priv->config->csum_flags;
}
target = NULL;
if (hook == priv->in) {
/* return frames on 'in' hook if 'out' not connected */
if (priv->out != NULL)
target = priv->out;
else
target = priv->in;
}
if (hook == priv->out && priv->in != NULL)
target = priv->in;
if (target == NULL) {
priv->stats.dropped++;
NG_FREE_ITEM(item);
NG_FREE_M(m);
return (0);
}
NG_FWD_NEW_DATA(error, item, target, m);
return (error);
}
static int
ng_patch_shutdown(node_p node)
{
const priv_p privdata = NG_NODE_PRIVATE(node);
if (privdata->val != NULL)
free(privdata->val, M_NETGRAPH);
if (privdata->config != NULL)
free(privdata->config, M_NETGRAPH);
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(node);
free(privdata, M_NETGRAPH);
return (0);
}
static int
ng_patch_disconnect(hook_p hook)
{
priv_p priv;
priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
if (hook == priv->in) {
priv->in = NULL;
}
if (hook == priv->out) {
priv->out = NULL;
}
if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) /* already shutting down? */
ng_rmnode_self(NG_HOOK_NODE(hook));
return (0);
}