--- /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.h: 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.
+ */
+
+#ifndef included_vnet_rewrite_h
+#define included_vnet_rewrite_h
+
+#include <vlib/vlib.h>
+#include <vnet/l3_types.h>
+
+/* Consider using vector types for speed? */
+typedef uword vnet_rewrite_data_t;
+
+/* *INDENT-OFF* */
+typedef CLIB_PACKED (struct {
+ /* Interface to mark re-written packets with. */
+ u32 sw_if_index;
+
+ /* Packet processing node where rewrite happens. */
+ u32 node_index;
+
+ /* Next node to feed after packet rewrite is done. */
+ u16 next_index;
+
+ /* Number of bytes in rewrite data. */
+ u16 data_bytes;
+
+ /* Max packet size layer 3 (MTU) for output interface.
+ Used for MTU check after packet rewrite. */
+ u16 max_l3_packet_bytes;
+
+ /* Rewrite string starting at end and going backwards. */
+ u8 data[0];
+}) vnet_rewrite_header_t;
+/* *INDENT-ON* */
+
+/*
+ Helper macro for declaring rewrite string w/ given max-size.
+
+ Typical usage:
+ typedef struct {
+ //
+ int a, b;
+
+ // Total adjacency is 64 bytes.
+ vnet_rewrite_declare(64 - 2*sizeof(int)) rw;
+ } my_adjacency_t;
+*/
+#define vnet_declare_rewrite(total_bytes) \
+struct { \
+ vnet_rewrite_header_t rewrite_header; \
+ \
+ u8 rewrite_data[(total_bytes) - sizeof (vnet_rewrite_header_t)]; \
+}
+
+always_inline void
+vnet_rewrite_clear_data_internal (vnet_rewrite_header_t * rw, int max_size)
+{
+ /* Sanity check values carefully for this memset operation */
+ ASSERT ((max_size > 0) && (max_size < VLIB_BUFFER_PRE_DATA_SIZE));
+
+ rw->data_bytes = 0;
+ memset (rw->data, 0xfe, max_size);
+}
+
+always_inline void
+vnet_rewrite_set_data_internal (vnet_rewrite_header_t * rw,
+ int max_size, void *data, int data_bytes)
+{
+ /* Sanity check values carefully for this memset operation */
+ ASSERT ((max_size > 0) && (max_size < VLIB_BUFFER_PRE_DATA_SIZE));
+ ASSERT ((data_bytes >= 0) && (data_bytes < max_size));
+
+ rw->data_bytes = data_bytes;
+ clib_memcpy (rw->data + max_size - data_bytes, data, data_bytes);
+ memset (rw->data, 0xfe, max_size - data_bytes);
+}
+
+#define vnet_rewrite_set_data(rw,data,data_bytes) \
+ vnet_rewrite_set_data_internal (&((rw).rewrite_header), \
+ sizeof ((rw).rewrite_data), \
+ (data), \
+ (data_bytes))
+
+always_inline void *
+vnet_rewrite_get_data_internal (vnet_rewrite_header_t * rw, int max_size)
+{
+ ASSERT (rw->data_bytes <= max_size);
+ return rw->data + max_size - rw->data_bytes;
+}
+
+#define vnet_rewrite_get_data(rw) \
+ vnet_rewrite_get_data_internal (&((rw).rewrite_header), sizeof ((rw).rewrite_data))
+
+always_inline void
+vnet_rewrite_copy_one (vnet_rewrite_data_t * p0, vnet_rewrite_data_t * rw0,
+ int i)
+{
+ p0[-i] = rw0[-i];
+}
+
+void vnet_rewrite_copy_slow_path (vnet_rewrite_data_t * p0,
+ vnet_rewrite_data_t * rw0,
+ word n_left, uword most_likely_size);
+
+/* *INDENT-OFF* */
+typedef CLIB_PACKED (struct {
+ u64 a;
+ u32 b;
+ u16 c;
+}) eh_copy_t;
+/* *INDENT-ON* */
+
+always_inline void
+_vnet_rewrite_one_header (vnet_rewrite_header_t * h0,
+ void *packet0, int max_size, int most_likely_size)
+{
+ vnet_rewrite_data_t *p0 = packet0;
+ vnet_rewrite_data_t *rw0 = (vnet_rewrite_data_t *) (h0->data + max_size);
+ word n_left0;
+
+ /* 0xfefe => poisoned adjacency => crash */
+ ASSERT (h0->data_bytes != 0xfefe);
+
+ if (PREDICT_TRUE (h0->data_bytes == sizeof (eh_copy_t)))
+ {
+ eh_copy_t *s, *d;
+ s = (eh_copy_t *) (h0->data + max_size - sizeof (eh_copy_t));
+ d = (eh_copy_t *) (((u8 *) packet0) - sizeof (eh_copy_t));
+ clib_memcpy (d, s, sizeof (eh_copy_t));
+ return;
+ }
+
+
+#define _(i) \
+ do { \
+ if (most_likely_size > ((i)-1)*sizeof (vnet_rewrite_data_t)) \
+ vnet_rewrite_copy_one (p0, rw0, (i)); \
+ } while (0)
+
+ _(4);
+ _(3);
+ _(2);
+ _(1);
+
+#undef _
+
+ n_left0 = (int)
+ (((int) h0->data_bytes - most_likely_size) + (sizeof (rw0[0]) - 1))
+ / (int) sizeof (rw0[0]);
+ if (PREDICT_FALSE (n_left0 > 0))
+ vnet_rewrite_copy_slow_path (p0, rw0, n_left0, most_likely_size);
+}
+
+always_inline void
+_vnet_rewrite_two_headers (vnet_rewrite_header_t * h0,
+ vnet_rewrite_header_t * h1,
+ void *packet0,
+ void *packet1, int max_size, int most_likely_size)
+{
+ vnet_rewrite_data_t *p0 = packet0;
+ vnet_rewrite_data_t *p1 = packet1;
+ vnet_rewrite_data_t *rw0 = (vnet_rewrite_data_t *) (h0->data + max_size);
+ vnet_rewrite_data_t *rw1 = (vnet_rewrite_data_t *) (h1->data + max_size);
+ word n_left0, n_left1;
+ int slow_path;
+
+ /* 0xfefe => poisoned adjacency => crash */
+ ASSERT (h0->data_bytes != 0xfefe);
+ ASSERT (h1->data_bytes != 0xfefe);
+
+ /* Arithmetic calculation: bytes0 == bytes1 == 14 */
+ slow_path = h0->data_bytes ^ h1->data_bytes;
+ slow_path += h0->data_bytes ^ sizeof (eh_copy_t);
+
+ if (PREDICT_TRUE (slow_path == 0))
+ {
+ eh_copy_t *s0, *d0, *s1, *d1;
+ s0 = (eh_copy_t *) (h0->data + max_size - sizeof (eh_copy_t));
+ d0 = (eh_copy_t *) (((u8 *) packet0) - sizeof (eh_copy_t));
+ clib_memcpy (d0, s0, sizeof (eh_copy_t));
+ s1 = (eh_copy_t *) (h1->data + max_size - sizeof (eh_copy_t));
+ d1 = (eh_copy_t *) (((u8 *) packet1) - sizeof (eh_copy_t));
+ clib_memcpy (d1, s1, sizeof (eh_copy_t));
+ return;
+ }
+
+#define _(i) \
+ do { \
+ if (most_likely_size > ((i)-1)*sizeof (vnet_rewrite_data_t)) \
+ { \
+ vnet_rewrite_copy_one (p0, rw0, (i)); \
+ vnet_rewrite_copy_one (p1, rw1, (i)); \
+ } \
+ } while (0)
+
+ _(4);
+ _(3);
+ _(2);
+ _(1);
+
+#undef _
+
+ n_left0 = (int)
+ (((int) h0->data_bytes - most_likely_size) + (sizeof (rw0[0]) - 1))
+ / (int) sizeof (rw0[0]);
+ n_left1 = (int)
+ (((int) h1->data_bytes - most_likely_size) + (sizeof (rw1[0]) - 1))
+ / (int) sizeof (rw1[0]);
+
+ if (PREDICT_FALSE (n_left0 > 0 || n_left1 > 0))
+ {
+ vnet_rewrite_copy_slow_path (p0, rw0, n_left0, most_likely_size);
+ vnet_rewrite_copy_slow_path (p1, rw1, n_left1, most_likely_size);
+ }
+}
+
+#define vnet_rewrite_one_header(rw0,p0,most_likely_size) \
+ _vnet_rewrite_one_header (&((rw0).rewrite_header), (p0), \
+ sizeof ((rw0).rewrite_data), \
+ (most_likely_size))
+
+#define vnet_rewrite_two_headers(rw0,rw1,p0,p1,most_likely_size) \
+ _vnet_rewrite_two_headers (&((rw0).rewrite_header), &((rw1).rewrite_header), \
+ (p0), (p1), \
+ sizeof ((rw0).rewrite_data), \
+ (most_likely_size))
+
+#define VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST ((void *) 0)
+/** Deprecated */
+void vnet_rewrite_for_sw_interface (struct vnet_main_t *vnm,
+ vnet_link_t packet_type,
+ u32 sw_if_index,
+ u32 node_index,
+ void *dst_address,
+ vnet_rewrite_header_t * rw,
+ u32 max_rewrite_bytes);
+
+u32 vnet_tx_node_index_for_sw_interface (struct vnet_main_t *vnm,
+ u32 sw_if_index);
+
+void vnet_rewrite_init (struct vnet_main_t *vnm,
+ u32 sw_if_index,
+ u32 this_node,
+ u32 next_node, vnet_rewrite_header_t * rw);
+
+u8 *vnet_build_rewrite_for_sw_interface (struct vnet_main_t *vnm,
+ u32 sw_if_index,
+ vnet_link_t packet_type,
+ const void *dst_address);
+void vnet_update_adjacency_for_sw_interface (struct vnet_main_t *vnm,
+ u32 sw_if_index, u32 ai);
+
+/* Parser for unformat header & rewrite string. */
+unformat_function_t unformat_vnet_rewrite;
+
+format_function_t format_vnet_rewrite;
+format_function_t format_vnet_rewrite_header;
+
+serialize_function_t serialize_vnet_rewrite, unserialize_vnet_rewrite;
+
+#endif /* included_vnet_rewrite_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
Code Review / vpp.git / blobdiff