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/*
* Copyright (c) 2015 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* rewrite.c: packet rewrite
*
* Copyright (c) 2008 Eliot Dresselhaus
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <vnet/vnet.h>
#include <vnet/ip/lookup.h>
void
vnet_rewrite_copy_slow_path (vnet_rewrite_data_t * p0,
vnet_rewrite_data_t * rw0,
word n_left, uword most_likely_size)
{
uword n_done =
round_pow2 (most_likely_size, sizeof (rw0[0])) / sizeof (rw0[0]);
p0 -= n_done;
rw0 -= n_done;
/* As we enter the cleanup loop, p0 and rw0 point to the last chunk written
by the fast path. Hence, the constant 1, which the
vnet_rewrite_copy_one macro renders as p0[-1] = rw0[-1]. */
while (n_left > 0)
{
vnet_rewrite_copy_one (p0, rw0, 1);
p0--;
rw0--;
n_left--;
}
}
u8 *
format_vnet_rewrite (u8 * s, va_list * args)
{
vnet_rewrite_header_t *rw = va_arg (*args, vnet_rewrite_header_t *);
u32 max_data_bytes = va_arg (*args, u32);
CLIB_UNUSED (uword indent) = va_arg (*args, u32);
vnet_main_t *vnm = vnet_get_main ();
if (rw->sw_if_index != ~0)
{
vnet_sw_interface_t *si;
si = vnet_get_sw_interface_safe (vnm, rw->sw_if_index);
if (NULL != si)
s = format (s, "%U: ", format_vnet_sw_interface_name, vnm, si);
else
s = format (s, "DELETED");
}
/* Format rewrite string. */
if (rw->data_bytes > 0)
s = format (s, "%U",
format_hex_bytes,
rw->data + max_data_bytes - rw->data_bytes, rw->data_bytes);
return s;
}
u32
vnet_tx_node_index_for_sw_interface (vnet_main_t * vnm, u32 sw_if_index)
{
vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
return (hw->output_node_index);
}
void
vnet_rewrite_init (vnet_main_t * vnm,
u32 sw_if_index,
u32 this_node, u32 next_node, vnet_rewrite_header_t * rw)
{
rw->sw_if_index = sw_if_index;
rw->next_index = vlib_node_add_next (vnm->vlib_main, this_node, next_node);
rw->max_l3_packet_bytes =
vnet_sw_interface_get_mtu (vnm, sw_if_index, VLIB_TX);
}
void
vnet_rewrite_for_sw_interface (vnet_main_t * vnm,
vnet_link_t link_type,
u32 sw_if_index,
u32 node_index,
void *dst_address,
vnet_rewrite_header_t * rw,
u32 max_rewrite_bytes)
{
vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
vnet_hw_interface_class_t *hc =
vnet_get_hw_interface_class (vnm, hw->hw_class_index);
u8 *rewrite = NULL;
vnet_rewrite_init (vnm, sw_if_index, node_index,
vnet_tx_node_index_for_sw_interface (vnm, sw_if_index),
rw);
ASSERT (hc->build_rewrite);
rewrite = hc->build_rewrite (vnm, sw_if_index, link_type, dst_address);
ASSERT (vec_len (rewrite) < max_rewrite_bytes);
vnet_rewrite_set_data_internal (rw, max_rewrite_bytes, rewrite,
vec_len (rewrite));
vec_free (rewrite);
}
void
vnet_rewrite_for_tunnel (vnet_main_t * vnm,
u32 tx_sw_if_index,
u32 rewrite_node_index,
u32 post_rewrite_node_index,
vnet_rewrite_header_t * rw,
u8 * rewrite_data, u32 rewrite_length)
{
ip_adjacency_t *adj = 0;
/*
* Installed into vnet_buffer(b)->sw_if_index[VLIB_TX] e.g.
* by ip4_rewrite_inline. If the post-rewrite node injects into
* ipX-forward, this will be interpreted as a FIB number.
*/
rw->sw_if_index = tx_sw_if_index;
rw->next_index = vlib_node_add_next (vnm->vlib_main, rewrite_node_index,
post_rewrite_node_index);
rw->max_l3_packet_bytes = (u16) ~ 0; /* we can't know at this point */
ASSERT (rewrite_length < sizeof (adj->rewrite_data));
/* Leave room for ethernet + VLAN tag */
vnet_rewrite_set_data_internal (rw, sizeof (adj->rewrite_data),
rewrite_data, rewrite_length);
}
void
serialize_vnet_rewrite (serialize_main_t * m, va_list * va)
{
vnet_rewrite_header_t *rw = va_arg (*va, vnet_rewrite_header_t *);
u32 max_data_bytes = va_arg (*va, u32);
u8 *p;
serialize_integer (m, rw->sw_if_index, sizeof (rw->sw_if_index));
serialize_integer (m, rw->data_bytes, sizeof (rw->data_bytes));
serialize_integer (m, rw->max_l3_packet_bytes,
sizeof (rw->max_l3_packet_bytes));
p = serialize_get (m, rw->data_bytes);
clib_memcpy (p, vnet_rewrite_get_data_internal (rw, max_data_bytes),
rw->data_bytes);
}
void
unserialize_vnet_rewrite (serialize_main_t * m, va_list * va)
{
vnet_rewrite_header_t *rw = va_arg (*va, vnet_rewrite_header_t *);
u32 max_data_bytes = va_arg (*va, u32);
u8 *p;
/* It is up to user to fill these in. */
rw->next_index = ~0;
unserialize_integer (m, &rw->sw_if_index, sizeof (rw->sw_if_index));
unserialize_integer (m, &rw->data_bytes, sizeof (rw->data_bytes));
unserialize_integer (m, &rw->max_l3_packet_bytes,
sizeof (rw->max_l3_packet_bytes));
p = unserialize_get (m, rw->data_bytes);
clib_memcpy (vnet_rewrite_get_data_internal (rw, max_data_bytes), p,
rw->data_bytes);
}
u8 *
vnet_build_rewrite_for_sw_interface (vnet_main_t * vnm,
u32 sw_if_index,
vnet_link_t link_type,
const void *dst_address)
{
vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
vnet_hw_interface_class_t *hc =
vnet_get_hw_interface_class (vnm, hw->hw_class_index);
ASSERT (hc->build_rewrite);
return (hc->build_rewrite (vnm, sw_if_index, link_type, dst_address));
}
void
vnet_update_adjacency_for_sw_interface (vnet_main_t * vnm,
u32 sw_if_index, u32 ai)
{
vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
vnet_hw_interface_class_t *hc =
vnet_get_hw_interface_class (vnm, hw->hw_class_index);
ASSERT (hc->update_adjacency);
hc->update_adjacency (vnm, sw_if_index, ai);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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