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 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
71 vnet_rewrite_header_t *rw = va_arg (*args, vnet_rewrite_header_t *);
72 u32 max_data_bytes = va_arg (*args, u32);
73 vnet_main_t *vnm = vnet_get_main ();
77 next = vlib_get_next_node (vm, rw->node_index, rw->next_index);
79 indent = format_get_indent (s);
81 if (rw->sw_if_index != ~0)
83 vnet_sw_interface_t *si;
84 si = vnet_get_sw_interface (vnm, rw->sw_if_index);
85 s = format (s, "%U", format_vnet_sw_interface_name, vnm, si);
88 s = format (s, "%v", next->name);
90 /* Format rewrite string. */
91 if (rw->data_bytes > 0)
92 s = format (s, "\n%U%U",
93 format_white_space, indent,
94 next->format_buffer ? next->format_buffer : format_hex_bytes,
95 rw->data + max_data_bytes - rw->data_bytes, rw->data_bytes);
101 format_vnet_rewrite_header (u8 * s, va_list * args)
103 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
104 vnet_rewrite_header_t *rw = va_arg (*args, vnet_rewrite_header_t *);
105 u8 *packet_data = va_arg (*args, u8 *);
106 u32 packet_data_bytes = va_arg (*args, u32);
109 next = vlib_get_next_node (vm, rw->node_index, rw->next_index);
111 /* Format rewrite string. */
113 next->format_buffer ? next->format_buffer : format_hex_bytes,
114 packet_data, packet_data_bytes);
120 unformat_vnet_rewrite (unformat_input_t * input, va_list * args)
122 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
123 vnet_rewrite_header_t *rw = va_arg (*args, vnet_rewrite_header_t *);
124 u32 max_data_bytes = va_arg (*args, u32);
125 vnet_main_t *vnm = vnet_get_main ();
127 u32 next_index, sw_if_index, max_packet_bytes, error;
132 max_packet_bytes = ~0;
135 /* Parse sw interface. */
136 if (unformat (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index))
138 vnet_hw_interface_t *hi;
140 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
142 next_index = hi->output_node_index;
143 max_packet_bytes = hi->max_l3_packet_bytes[VLIB_RX];
146 else if (unformat (input, "%U", unformat_vlib_node, vm, &next_index))
152 next = vlib_get_node (vm, next_index);
154 if (next->unformat_buffer
155 && unformat_user (input, next->unformat_buffer, &rw_data))
158 else if (unformat_user (input, unformat_hex_string, &rw_data)
159 || unformat (input, "0x%U", unformat_hex_string, &rw_data))
165 /* Re-write does not fit. */
166 if (vec_len (rw_data) >= max_data_bytes)
172 if (unformat (input, "mtu %d", &tmp)
173 && tmp < (1 << BITS (rw->max_l3_packet_bytes)))
174 max_packet_bytes = tmp;
178 rw->sw_if_index = sw_if_index;
179 rw->max_l3_packet_bytes = max_packet_bytes;
180 rw->next_index = vlib_node_add_next (vm, rw->node_index, next_index);
181 vnet_rewrite_set_data_internal (rw, max_data_bytes, rw_data,
190 vnet_rewrite_for_sw_interface (vnet_main_t * vnm,
191 vnet_l3_packet_type_t packet_type,
195 vnet_rewrite_header_t * rw,
196 u32 max_rewrite_bytes)
198 vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
199 vnet_hw_interface_class_t *hc =
200 vnet_get_hw_interface_class (vnm, hw->hw_class_index);
201 static u8 *rw_tmp = 0;
204 rw->sw_if_index = sw_if_index;
205 rw->node_index = node_index;
207 vlib_node_add_next (vnm->vlib_main, node_index, hw->output_node_index);
208 rw->max_l3_packet_bytes = hw->max_l3_packet_bytes[VLIB_TX];
210 ASSERT (max_rewrite_bytes > 0);
211 vec_reset_length (rw_tmp);
212 vec_validate (rw_tmp, max_rewrite_bytes - 1);
214 ASSERT (hc->set_rewrite);
216 hc->set_rewrite (vnm, sw_if_index, packet_type, dst_address, rw_tmp,
219 ASSERT (n_rw_tmp < max_rewrite_bytes);
220 vnet_rewrite_set_data_internal (rw, max_rewrite_bytes, rw_tmp, n_rw_tmp);
224 vnet_rewrite_for_tunnel (vnet_main_t * vnm,
226 u32 rewrite_node_index,
227 u32 post_rewrite_node_index,
228 vnet_rewrite_header_t * rw,
229 u8 * rewrite_data, u32 rewrite_length)
231 ip_adjacency_t *adj = 0;
233 * Installed into vnet_buffer(b)->sw_if_index[VLIB_TX] e.g.
234 * by ip4_rewrite_inline. If the post-rewrite node injects into
235 * ipX-forward, this will be interpreted as a FIB number.
237 rw->sw_if_index = tx_sw_if_index;
238 rw->node_index = rewrite_node_index;
239 rw->next_index = vlib_node_add_next (vnm->vlib_main, rewrite_node_index,
240 post_rewrite_node_index);
241 rw->max_l3_packet_bytes = (u16) ~ 0; /* we can't know at this point */
243 ASSERT (rewrite_length < sizeof (adj->rewrite_data));
244 /* Leave room for ethernet + VLAN tag */
245 vnet_rewrite_set_data_internal (rw, sizeof (adj->rewrite_data),
246 rewrite_data, rewrite_length);
250 serialize_vnet_rewrite (serialize_main_t * m, va_list * va)
252 vnet_rewrite_header_t *rw = va_arg (*va, vnet_rewrite_header_t *);
253 u32 max_data_bytes = va_arg (*va, u32);
256 serialize_integer (m, rw->sw_if_index, sizeof (rw->sw_if_index));
257 serialize_integer (m, rw->data_bytes, sizeof (rw->data_bytes));
258 serialize_integer (m, rw->max_l3_packet_bytes,
259 sizeof (rw->max_l3_packet_bytes));
260 p = serialize_get (m, rw->data_bytes);
261 clib_memcpy (p, vnet_rewrite_get_data_internal (rw, max_data_bytes),
266 unserialize_vnet_rewrite (serialize_main_t * m, va_list * va)
268 vnet_rewrite_header_t *rw = va_arg (*va, vnet_rewrite_header_t *);
269 u32 max_data_bytes = va_arg (*va, u32);
272 /* It is up to user to fill these in. */
276 unserialize_integer (m, &rw->sw_if_index, sizeof (rw->sw_if_index));
277 unserialize_integer (m, &rw->data_bytes, sizeof (rw->data_bytes));
278 unserialize_integer (m, &rw->max_l3_packet_bytes,
279 sizeof (rw->max_l3_packet_bytes));
280 p = unserialize_get (m, rw->data_bytes);
281 clib_memcpy (vnet_rewrite_get_data_internal (rw, max_data_bytes), p,
286 * fd.io coding-style-patch-verification: ON
289 * eval: (c-set-style "gnu")