2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 * rewrite.c: packet rewrite
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #include <vnet/vnet.h>
41 #include <vnet/ip/lookup.h>
44 vnet_rewrite_copy_slow_path (vnet_rewrite_data_t * p0,
45 vnet_rewrite_data_t * rw0,
46 word n_left, uword most_likely_size)
49 round_pow2 (most_likely_size, sizeof (rw0[0])) / sizeof (rw0[0]);
54 /* As we enter the cleanup loop, p0 and rw0 point to the last chunk written
55 by the fast path. Hence, the constant 1, which the
56 vnet_rewrite_copy_one macro renders as p0[-1] = rw0[-1]. */
60 vnet_rewrite_copy_one (p0, rw0, 1);
68 format_vnet_rewrite (u8 * s, va_list * args)
70 vnet_rewrite_header_t *rw = va_arg (*args, vnet_rewrite_header_t *);
71 u32 max_data_bytes = va_arg (*args, u32);
72 CLIB_UNUSED (u32 indent) = va_arg (*args, u32);
73 vnet_main_t *vnm = vnet_get_main ();
75 if (rw->sw_if_index != ~0)
77 vnet_sw_interface_t *si;
78 si = vnet_get_sw_interface_safe (vnm, rw->sw_if_index);
80 s = format (s, "%U:", format_vnet_sw_interface_name, vnm, si);
82 s = format (s, "DELETED:%d", rw->sw_if_index);
85 /* Format rewrite string. */
86 if (rw->data_bytes > 0)
89 rw->data + max_data_bytes - rw->data_bytes, rw->data_bytes);
95 vnet_tx_node_index_for_sw_interface (vnet_main_t * vnm, u32 sw_if_index)
97 vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
98 return (hw->output_node_index);
102 vnet_rewrite_init (vnet_main_t * vnm,
104 u32 this_node, u32 next_node, vnet_rewrite_header_t * rw)
106 rw->sw_if_index = sw_if_index;
107 rw->next_index = vlib_node_add_next (vnm->vlib_main, this_node, next_node);
108 rw->max_l3_packet_bytes =
109 vnet_sw_interface_get_mtu (vnm, sw_if_index, VLIB_TX);
113 vnet_rewrite_update_mtu (vnet_main_t * vnm, vnet_rewrite_header_t * rw)
115 rw->max_l3_packet_bytes =
116 vnet_sw_interface_get_mtu (vnm, rw->sw_if_index, VLIB_TX);
120 vnet_rewrite_for_sw_interface (vnet_main_t * vnm,
121 vnet_link_t link_type,
125 vnet_rewrite_header_t * rw,
126 u32 max_rewrite_bytes)
129 vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
130 vnet_hw_interface_class_t *hc =
131 vnet_get_hw_interface_class (vnm, hw->hw_class_index);
134 vnet_rewrite_init (vnm, sw_if_index, node_index,
135 vnet_tx_node_index_for_sw_interface (vnm, sw_if_index),
138 ASSERT (hc->build_rewrite);
139 rewrite = hc->build_rewrite (vnm, sw_if_index, link_type, dst_address);
141 ASSERT (vec_len (rewrite) < max_rewrite_bytes);
142 vnet_rewrite_set_data_internal (rw, max_rewrite_bytes, rewrite,
148 vnet_rewrite_for_tunnel (vnet_main_t * vnm,
150 u32 rewrite_node_index,
151 u32 post_rewrite_node_index,
152 vnet_rewrite_header_t * rw,
153 u8 * rewrite_data, u32 rewrite_length)
155 ip_adjacency_t *adj = 0;
157 * Installed into vnet_buffer(b)->sw_if_index[VLIB_TX] e.g.
158 * by ip4_rewrite_inline. If the post-rewrite node injects into
159 * ipX-forward, this will be interpreted as a FIB number.
161 rw->sw_if_index = tx_sw_if_index;
162 rw->next_index = vlib_node_add_next (vnm->vlib_main, rewrite_node_index,
163 post_rewrite_node_index);
164 rw->max_l3_packet_bytes = (u16) ~ 0; /* we can't know at this point */
166 ASSERT (rewrite_length < sizeof (adj->rewrite_data));
167 /* Leave room for ethernet + VLAN tag */
168 vnet_rewrite_set_data_internal (rw, sizeof (adj->rewrite_data),
169 rewrite_data, rewrite_length);
173 serialize_vnet_rewrite (serialize_main_t * m, va_list * va)
175 vnet_rewrite_header_t *rw = va_arg (*va, vnet_rewrite_header_t *);
176 u32 max_data_bytes = va_arg (*va, u32);
179 serialize_integer (m, rw->sw_if_index, sizeof (rw->sw_if_index));
180 serialize_integer (m, rw->data_bytes, sizeof (rw->data_bytes));
181 serialize_integer (m, rw->max_l3_packet_bytes,
182 sizeof (rw->max_l3_packet_bytes));
183 p = serialize_get (m, rw->data_bytes);
184 clib_memcpy (p, vnet_rewrite_get_data_internal (rw, max_data_bytes),
189 unserialize_vnet_rewrite (serialize_main_t * m, va_list * va)
191 vnet_rewrite_header_t *rw = va_arg (*va, vnet_rewrite_header_t *);
192 u32 max_data_bytes = va_arg (*va, u32);
195 /* It is up to user to fill these in. */
198 unserialize_integer (m, &rw->sw_if_index, sizeof (rw->sw_if_index));
199 unserialize_integer (m, &rw->data_bytes, sizeof (rw->data_bytes));
200 unserialize_integer (m, &rw->max_l3_packet_bytes,
201 sizeof (rw->max_l3_packet_bytes));
202 p = unserialize_get (m, rw->data_bytes);
203 clib_memcpy (vnet_rewrite_get_data_internal (rw, max_data_bytes), p,
208 vnet_build_rewrite_for_sw_interface (vnet_main_t * vnm,
210 vnet_link_t link_type,
211 const void *dst_address)
213 vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
214 vnet_hw_interface_class_t *hc =
215 vnet_get_hw_interface_class (vnm, hw->hw_class_index);
217 ASSERT (hc->build_rewrite);
218 return (hc->build_rewrite (vnm, sw_if_index, link_type, dst_address));
223 vnet_update_adjacency_for_sw_interface (vnet_main_t * vnm,
224 u32 sw_if_index, u32 ai)
226 vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
227 vnet_hw_interface_class_t *hc =
228 vnet_get_hw_interface_class (vnm, hw->hw_class_index);
230 ASSERT (hc->update_adjacency);
231 hc->update_adjacency (vnm, sw_if_index, ai);
235 * fd.io coding-style-patch-verification: ON
238 * eval: (c-set-style "gnu")