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)
90 rw->data + max_data_bytes - rw->data_bytes, rw->data_bytes);
96 vnet_tx_node_index_for_sw_interface (vnet_main_t * vnm, u32 sw_if_index)
98 vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
99 return (hw->output_node_index);
103 vnet_rewrite_init (vnet_main_t * vnm,
105 u32 this_node, u32 next_node, vnet_rewrite_header_t * rw)
107 rw->sw_if_index = sw_if_index;
108 rw->next_index = vlib_node_add_next (vnm->vlib_main, this_node, next_node);
109 rw->max_l3_packet_bytes =
110 vnet_sw_interface_get_mtu (vnm, sw_if_index, VLIB_TX);
114 vnet_rewrite_for_sw_interface (vnet_main_t * vnm,
115 vnet_link_t link_type,
119 vnet_rewrite_header_t * rw,
120 u32 max_rewrite_bytes)
123 vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
124 vnet_hw_interface_class_t *hc =
125 vnet_get_hw_interface_class (vnm, hw->hw_class_index);
128 vnet_rewrite_init (vnm, sw_if_index, node_index,
129 vnet_tx_node_index_for_sw_interface (vnm, sw_if_index),
132 ASSERT (hc->build_rewrite);
133 rewrite = hc->build_rewrite (vnm, sw_if_index, link_type, dst_address);
135 ASSERT (vec_len (rewrite) < max_rewrite_bytes);
136 vnet_rewrite_set_data_internal (rw, max_rewrite_bytes, rewrite,
142 vnet_rewrite_for_tunnel (vnet_main_t * vnm,
144 u32 rewrite_node_index,
145 u32 post_rewrite_node_index,
146 vnet_rewrite_header_t * rw,
147 u8 * rewrite_data, u32 rewrite_length)
149 ip_adjacency_t *adj = 0;
151 * Installed into vnet_buffer(b)->sw_if_index[VLIB_TX] e.g.
152 * by ip4_rewrite_inline. If the post-rewrite node injects into
153 * ipX-forward, this will be interpreted as a FIB number.
155 rw->sw_if_index = tx_sw_if_index;
156 rw->next_index = vlib_node_add_next (vnm->vlib_main, rewrite_node_index,
157 post_rewrite_node_index);
158 rw->max_l3_packet_bytes = (u16) ~ 0; /* we can't know at this point */
160 ASSERT (rewrite_length < sizeof (adj->rewrite_data));
161 /* Leave room for ethernet + VLAN tag */
162 vnet_rewrite_set_data_internal (rw, sizeof (adj->rewrite_data),
163 rewrite_data, rewrite_length);
167 serialize_vnet_rewrite (serialize_main_t * m, va_list * va)
169 vnet_rewrite_header_t *rw = va_arg (*va, vnet_rewrite_header_t *);
170 u32 max_data_bytes = va_arg (*va, u32);
173 serialize_integer (m, rw->sw_if_index, sizeof (rw->sw_if_index));
174 serialize_integer (m, rw->data_bytes, sizeof (rw->data_bytes));
175 serialize_integer (m, rw->max_l3_packet_bytes,
176 sizeof (rw->max_l3_packet_bytes));
177 p = serialize_get (m, rw->data_bytes);
178 clib_memcpy (p, vnet_rewrite_get_data_internal (rw, max_data_bytes),
183 unserialize_vnet_rewrite (serialize_main_t * m, va_list * va)
185 vnet_rewrite_header_t *rw = va_arg (*va, vnet_rewrite_header_t *);
186 u32 max_data_bytes = va_arg (*va, u32);
189 /* It is up to user to fill these in. */
192 unserialize_integer (m, &rw->sw_if_index, sizeof (rw->sw_if_index));
193 unserialize_integer (m, &rw->data_bytes, sizeof (rw->data_bytes));
194 unserialize_integer (m, &rw->max_l3_packet_bytes,
195 sizeof (rw->max_l3_packet_bytes));
196 p = unserialize_get (m, rw->data_bytes);
197 clib_memcpy (vnet_rewrite_get_data_internal (rw, max_data_bytes), p,
202 vnet_build_rewrite_for_sw_interface (vnet_main_t * vnm,
204 vnet_link_t link_type,
205 const void *dst_address)
207 vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
208 vnet_hw_interface_class_t *hc =
209 vnet_get_hw_interface_class (vnm, hw->hw_class_index);
211 ASSERT (hc->build_rewrite);
212 return (hc->build_rewrite (vnm, sw_if_index, link_type, dst_address));
217 vnet_update_adjacency_for_sw_interface (vnet_main_t * vnm,
218 u32 sw_if_index, u32 ai)
220 vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
221 vnet_hw_interface_class_t *hc =
222 vnet_get_hw_interface_class (vnm, hw->hw_class_index);
224 ASSERT (hc->update_adjacency);
225 hc->update_adjacency (vnm, sw_if_index, ai);
229 * fd.io coding-style-patch-verification: ON
232 * eval: (c-set-style "gnu")