--- /dev/null
+/*
+ * 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)
+{
+ vlib_main_t *vm = va_arg (*args, vlib_main_t *);
+ 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 ();
+ vlib_node_t *next;
+
+ next = vlib_get_next_node (vm, rw->node_index, rw->next_index);
+
+ if (rw->sw_if_index != ~0)
+ {
+ vnet_sw_interface_t *si;
+ si = vnet_get_sw_interface (vnm, rw->sw_if_index);
+ s = format (s, "%U: ", format_vnet_sw_interface_name, vnm, si);
+ }
+ else
+ s = format (s, "%v: ", next->name);
+
+ /* Format rewrite string. */
+ if (rw->data_bytes > 0)
+
+ s = format (s, "%U",
+ next->format_buffer ? next->format_buffer : format_hex_bytes,
+ rw->data + max_data_bytes - rw->data_bytes, rw->data_bytes);
+
+ return s;
+}
+
+u8 *
+format_vnet_rewrite_header (u8 * s, va_list * args)
+{
+ vlib_main_t *vm = va_arg (*args, vlib_main_t *);
+ vnet_rewrite_header_t *rw = va_arg (*args, vnet_rewrite_header_t *);
+ u8 *packet_data = va_arg (*args, u8 *);
+ u32 packet_data_bytes = va_arg (*args, u32);
+ vlib_node_t *next;
+
+ next = vlib_get_next_node (vm, rw->node_index, rw->next_index);
+
+ /* Format rewrite string. */
+ s = format (s, "%U",
+ next->format_buffer ? next->format_buffer : format_hex_bytes,
+ packet_data, packet_data_bytes);
+
+ return s;
+}
+
+uword
+unformat_vnet_rewrite (unformat_input_t * input, va_list * args)
+{
+ vlib_main_t *vm = va_arg (*args, vlib_main_t *);
+ vnet_rewrite_header_t *rw = va_arg (*args, vnet_rewrite_header_t *);
+ u32 max_data_bytes = va_arg (*args, u32);
+ vnet_main_t *vnm = vnet_get_main ();
+ vlib_node_t *next;
+ u32 next_index, sw_if_index, max_packet_bytes, error;
+ u8 *rw_data;
+
+ rw_data = 0;
+ sw_if_index = ~0;
+ max_packet_bytes = ~0;
+ error = 1;
+
+ /* Parse sw interface. */
+ if (unformat (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index))
+ {
+ vnet_hw_interface_t *hi;
+
+ hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
+
+ next_index = hi->output_node_index;
+ max_packet_bytes = hi->max_l3_packet_bytes[VLIB_RX];
+ }
+
+ else if (unformat (input, "%U", unformat_vlib_node, vm, &next_index))
+ ;
+
+ else
+ goto done;
+
+ next = vlib_get_node (vm, next_index);
+
+ if (next->unformat_buffer
+ && unformat_user (input, next->unformat_buffer, &rw_data))
+ ;
+
+ else if (unformat_user (input, unformat_hex_string, &rw_data)
+ || unformat (input, "0x%U", unformat_hex_string, &rw_data))
+ ;
+
+ else
+ goto done;
+
+ /* Re-write does not fit. */
+ if (vec_len (rw_data) >= max_data_bytes)
+ goto done;
+
+ {
+ u32 tmp;
+
+ if (unformat (input, "mtu %d", &tmp)
+ && tmp < (1 << BITS (rw->max_l3_packet_bytes)))
+ max_packet_bytes = tmp;
+ }
+
+ error = 0;
+ rw->sw_if_index = sw_if_index;
+ rw->max_l3_packet_bytes = max_packet_bytes;
+ rw->next_index = vlib_node_add_next (vm, rw->node_index, next_index);
+ vnet_rewrite_set_data_internal (rw, max_data_bytes, rw_data,
+ vec_len (rw_data));
+
+done:
+ vec_free (rw_data);
+ return error == 0;
+}
+
+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->node_index = this_node;
+ 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->node_index = rewrite_node_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->node_index = ~0;
+ 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:
+ */
Code Review / vpp.git / blobdiff