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freebsd/sys/netgraph/ng_patch.c
Pedro F. Giffuni fe267a5590 sys: general adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:23:17 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2010 Maxim Ignatenko <gelraen.ua@gmail.com>
* Copyright (c) 2015 Dmitry Vagin <daemon.hammer@ya.ru>
* 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("$FreeBSD$");
#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 <net/bpf.h>
#include <net/ethernet.h>
#include <netgraph/ng_message.h>
#include <netgraph/ng_parse.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_patch.h>
/* private data */
struct ng_patch_priv {
hook_p in;
hook_p out;
uint8_t dlt; /* DLT_XXX from bpf.h */
struct ng_patch_stats stats;
struct ng_patch_config *conf;
};
typedef struct ng_patch_priv *priv_p;
/* Netgraph methods */
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;
#define ERROUT(x) { error = (x); goto done; }
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 *conf;
conf = (const struct ng_patch_config *)(buf -
offsetof(struct ng_patch_config, ops));
return (conf->count);
}
static const struct ng_parse_struct_field ng_patch_op_type_fields[]
= NG_PATCH_OP_TYPE;
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_ops_array_info = {
&ng_patch_op_type,
&ng_patch_config_getlen
};
static const struct ng_parse_type ng_patch_ops_array_type = {
&ng_parse_array_type,
&ng_patch_ops_array_info
};
static const struct ng_parse_struct_field ng_patch_config_type_fields[]
= NG_PATCH_CONFIG_TYPE;
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;
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_GETDLT,
"getdlt",
NULL,
&ng_parse_uint8_type
},
{
NGM_PATCH_COOKIE,
NGM_PATCH_SETDLT,
"setdlt",
&ng_parse_uint8_type,
NULL
},
{
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);
static int
ng_patch_constructor(node_p node)
{
priv_p privdata;
privdata = malloc(sizeof(*privdata), M_NETGRAPH, M_WAITOK | M_ZERO);
privdata->dlt = DLT_RAW;
NG_NODE_SET_PRIVATE(node, privdata);
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;
struct ng_mesg *msg;
struct ng_mesg *resp = NULL;
int i, error = 0;
NGI_GET_MSG(item, msg);
if (msg->header.typecookie != NGM_PATCH_COOKIE)
ERROUT(EINVAL);
switch (msg->header.cmd)
{
case NGM_PATCH_GETCONFIG:
if (privp->conf == NULL)
ERROUT(0);
NG_MKRESPONSE(resp, msg,
NG_PATCH_CONF_SIZE(privp->conf->count), M_WAITOK);
if (resp == NULL)
ERROUT(ENOMEM);
bcopy(privp->conf, resp->data,
NG_PATCH_CONF_SIZE(privp->conf->count));
conf = (struct ng_patch_config *) resp->data;
for (i = 0; i < conf->count; i++) {
switch (conf->ops[i].length)
{
case 1:
conf->ops[i].val.v8 = conf->ops[i].val.v1;
break;
case 2:
conf->ops[i].val.v8 = conf->ops[i].val.v2;
break;
case 4:
conf->ops[i].val.v8 = conf->ops[i].val.v4;
break;
case 8:
break;
}
}
break;
case NGM_PATCH_SETCONFIG:
conf = (struct ng_patch_config *) msg->data;
if (msg->header.arglen < sizeof(struct ng_patch_config) ||
msg->header.arglen < NG_PATCH_CONF_SIZE(conf->count))
ERROUT(EINVAL);
for (i = 0; i < conf->count; i++) {
switch (conf->ops[i].length)
{
case 1:
conf->ops[i].val.v1 = (uint8_t) conf->ops[i].val.v8;
break;
case 2:
conf->ops[i].val.v2 = (uint16_t) conf->ops[i].val.v8;
break;
case 4:
conf->ops[i].val.v4 = (uint32_t) conf->ops[i].val.v8;
break;
case 8:
break;
default:
ERROUT(EINVAL);
}
}
conf->csum_flags &= NG_PATCH_CSUM_IPV4|NG_PATCH_CSUM_IPV6;
conf->relative_offset = !!conf->relative_offset;
newconf = malloc(NG_PATCH_CONF_SIZE(conf->count), M_NETGRAPH, M_WAITOK | M_ZERO);
bcopy(conf, newconf, NG_PATCH_CONF_SIZE(conf->count));
if (privp->conf)
free(privp->conf, M_NETGRAPH);
privp->conf = newconf;
break;
case NGM_PATCH_GET_STATS:
case NGM_PATCH_CLR_STATS:
case NGM_PATCH_GETCLR_STATS:
if (msg->header.cmd != NGM_PATCH_CLR_STATS) {
NG_MKRESPONSE(resp, msg, sizeof(struct ng_patch_stats), M_WAITOK);
if (resp == NULL)
ERROUT(ENOMEM);
bcopy(&(privp->stats), resp->data, sizeof(struct ng_patch_stats));
}
if (msg->header.cmd != NGM_PATCH_GET_STATS)
bzero(&(privp->stats), sizeof(struct ng_patch_stats));
break;
case NGM_PATCH_GETDLT:
NG_MKRESPONSE(resp, msg, sizeof(uint8_t), M_WAITOK);
if (resp == NULL)
ERROUT(ENOMEM);
*((uint8_t *) resp->data) = privp->dlt;
break;
case NGM_PATCH_SETDLT:
if (msg->header.arglen != sizeof(uint8_t))
ERROUT(EINVAL);
switch (*(uint8_t *) msg->data)
{
case DLT_EN10MB:
case DLT_RAW:
privp->dlt = *(uint8_t *) msg->data;
break;
default:
ERROUT(EINVAL);
}
break;
default:
ERROUT(EINVAL);
}
done:
NG_RESPOND_MSG(error, node, item, resp);
NG_FREE_MSG(msg);
return (error);
}
static void
do_patch(priv_p privp, struct mbuf *m, int global_offset)
{
int i, offset, patched = 0;
union ng_patch_op_val val;
for (i = 0; i < privp->conf->count; i++) {
offset = global_offset + privp->conf->ops[i].offset;
if (offset + privp->conf->ops[i].length > m->m_pkthdr.len)
continue;
/* for "=" operation we don't need to copy data from mbuf */
if (privp->conf->ops[i].mode != NG_PATCH_MODE_SET)
m_copydata(m, offset, privp->conf->ops[i].length, (caddr_t) &val);
switch (privp->conf->ops[i].length)
{
case 1:
switch (privp->conf->ops[i].mode)
{
case NG_PATCH_MODE_SET:
val.v1 = privp->conf->ops[i].val.v1;
break;
case NG_PATCH_MODE_ADD:
val.v1 += privp->conf->ops[i].val.v1;
break;
case NG_PATCH_MODE_SUB:
val.v1 -= privp->conf->ops[i].val.v1;
break;
case NG_PATCH_MODE_MUL:
val.v1 *= privp->conf->ops[i].val.v1;
break;
case NG_PATCH_MODE_DIV:
val.v1 /= privp->conf->ops[i].val.v1;
break;
case NG_PATCH_MODE_NEG:
*((int8_t *) &val) = - *((int8_t *) &val);
break;
case NG_PATCH_MODE_AND:
val.v1 &= privp->conf->ops[i].val.v1;
break;
case NG_PATCH_MODE_OR:
val.v1 |= privp->conf->ops[i].val.v1;
break;
case NG_PATCH_MODE_XOR:
val.v1 ^= privp->conf->ops[i].val.v1;
break;
case NG_PATCH_MODE_SHL:
val.v1 <<= privp->conf->ops[i].val.v1;
break;
case NG_PATCH_MODE_SHR:
val.v1 >>= privp->conf->ops[i].val.v1;
break;
}
break;
case 2:
val.v2 = ntohs(val.v2);
switch (privp->conf->ops[i].mode)
{
case NG_PATCH_MODE_SET:
val.v2 = privp->conf->ops[i].val.v2;
break;
case NG_PATCH_MODE_ADD:
val.v2 += privp->conf->ops[i].val.v2;
break;
case NG_PATCH_MODE_SUB:
val.v2 -= privp->conf->ops[i].val.v2;
break;
case NG_PATCH_MODE_MUL:
val.v2 *= privp->conf->ops[i].val.v2;
break;
case NG_PATCH_MODE_DIV:
val.v2 /= privp->conf->ops[i].val.v2;
break;
case NG_PATCH_MODE_NEG:
*((int16_t *) &val) = - *((int16_t *) &val);
break;
case NG_PATCH_MODE_AND:
val.v2 &= privp->conf->ops[i].val.v2;
break;
case NG_PATCH_MODE_OR:
val.v2 |= privp->conf->ops[i].val.v2;
break;
case NG_PATCH_MODE_XOR:
val.v2 ^= privp->conf->ops[i].val.v2;
break;
case NG_PATCH_MODE_SHL:
val.v2 <<= privp->conf->ops[i].val.v2;
break;
case NG_PATCH_MODE_SHR:
val.v2 >>= privp->conf->ops[i].val.v2;
break;
}
val.v2 = htons(val.v2);
break;
case 4:
val.v4 = ntohl(val.v4);
switch (privp->conf->ops[i].mode)
{
case NG_PATCH_MODE_SET:
val.v4 = privp->conf->ops[i].val.v4;
break;
case NG_PATCH_MODE_ADD:
val.v4 += privp->conf->ops[i].val.v4;
break;
case NG_PATCH_MODE_SUB:
val.v4 -= privp->conf->ops[i].val.v4;
break;
case NG_PATCH_MODE_MUL:
val.v4 *= privp->conf->ops[i].val.v4;
break;
case NG_PATCH_MODE_DIV:
val.v4 /= privp->conf->ops[i].val.v4;
break;
case NG_PATCH_MODE_NEG:
*((int32_t *) &val) = - *((int32_t *) &val);
break;
case NG_PATCH_MODE_AND:
val.v4 &= privp->conf->ops[i].val.v4;
break;
case NG_PATCH_MODE_OR:
val.v4 |= privp->conf->ops[i].val.v4;
break;
case NG_PATCH_MODE_XOR:
val.v4 ^= privp->conf->ops[i].val.v4;
break;
case NG_PATCH_MODE_SHL:
val.v4 <<= privp->conf->ops[i].val.v4;
break;
case NG_PATCH_MODE_SHR:
val.v4 >>= privp->conf->ops[i].val.v4;
break;
}
val.v4 = htonl(val.v4);
break;
case 8:
val.v8 = be64toh(val.v8);
switch (privp->conf->ops[i].mode)
{
case NG_PATCH_MODE_SET:
val.v8 = privp->conf->ops[i].val.v8;
break;
case NG_PATCH_MODE_ADD:
val.v8 += privp->conf->ops[i].val.v8;
break;
case NG_PATCH_MODE_SUB:
val.v8 -= privp->conf->ops[i].val.v8;
break;
case NG_PATCH_MODE_MUL:
val.v8 *= privp->conf->ops[i].val.v8;
break;
case NG_PATCH_MODE_DIV:
val.v8 /= privp->conf->ops[i].val.v8;
break;
case NG_PATCH_MODE_NEG:
*((int64_t *) &val) = - *((int64_t *) &val);
break;
case NG_PATCH_MODE_AND:
val.v8 &= privp->conf->ops[i].val.v8;
break;
case NG_PATCH_MODE_OR:
val.v8 |= privp->conf->ops[i].val.v8;
break;
case NG_PATCH_MODE_XOR:
val.v8 ^= privp->conf->ops[i].val.v8;
break;
case NG_PATCH_MODE_SHL:
val.v8 <<= privp->conf->ops[i].val.v8;
break;
case NG_PATCH_MODE_SHR:
val.v8 >>= privp->conf->ops[i].val.v8;
break;
}
val.v8 = htobe64(val.v8);
break;
}
m_copyback(m, offset, privp->conf->ops[i].length, (caddr_t) &val);
patched = 1;
}
if (patched)
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 out;
int pullup_len = 0;
int error = 0;
priv->stats.received++;
NGI_GET_M(item, m);
#define PULLUP_CHECK(mbuf, length) do { \
pullup_len += length; \
if (((mbuf)->m_pkthdr.len < pullup_len) || \
(pullup_len > MHLEN)) { \
error = EINVAL; \
goto bypass; \
} \
if ((mbuf)->m_len < pullup_len && \
(((mbuf) = m_pullup((mbuf), pullup_len)) == NULL)) { \
error = ENOBUFS; \
goto drop; \
} \
} while (0)
if (priv->conf && hook == priv->in &&
m && (m->m_flags & M_PKTHDR)) {
m = m_unshare(m, M_NOWAIT);
if (m == NULL)
ERROUT(ENOMEM);
if (priv->conf->relative_offset) {
struct ether_header *eh;
struct ng_patch_vlan_header *vh;
uint16_t etype;
switch (priv->dlt)
{
case DLT_EN10MB:
PULLUP_CHECK(m, sizeof(struct ether_header));
eh = mtod(m, struct ether_header *);
etype = ntohs(eh->ether_type);
for (;;) { /* QinQ support */
switch (etype)
{
case 0x8100:
case 0x88A8:
case 0x9100:
PULLUP_CHECK(m, sizeof(struct ng_patch_vlan_header));
vh = (struct ng_patch_vlan_header *) mtodo(m,
pullup_len - sizeof(struct ng_patch_vlan_header));
etype = ntohs(vh->etype);
break;
default:
goto loopend;
}
}
loopend:
break;
case DLT_RAW:
break;
default:
ERROUT(EINVAL);
}
}
do_patch(priv, m, pullup_len);
m->m_pkthdr.csum_flags |= priv->conf->csum_flags;
}
#undef PULLUP_CHECK
bypass:
out = NULL;
if (hook == priv->in) {
/* return frames on 'in' hook if 'out' not connected */
out = priv->out ? priv->out : priv->in;
} else if (hook == priv->out && priv->in) {
/* pass frames on 'out' hook if 'in' connected */
out = priv->in;
}
if (out == NULL)
ERROUT(0);
NG_FWD_NEW_DATA(error, item, out, m);
return (error);
done:
drop:
NG_FREE_ITEM(item);
NG_FREE_M(m);
priv->stats.dropped++;
return (error);
}
static int
ng_patch_shutdown(node_p node)
{
const priv_p privdata = NG_NODE_PRIVATE(node);
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(node);
if (privdata->conf != NULL)
free(privdata->conf, M_NETGRAPH);
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);
}
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