+++ /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;
-
-/**
- * Flags associated with the rewrite/adjacency
- */
-typedef enum vnet_rewrite_flags_t_
-{
- /**
- * This adjacency/interface has output features configured
- */
- VNET_REWRITE_HAS_FEATURES = (1 << 0),
-} __attribute__ ((packed)) vnet_rewrite_flags_t;
-
-/* *INDENT-OFF* */
-typedef CLIB_PACKED (struct {
- /* Interface to mark re-written packets with. */
- u32 sw_if_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;
-
- /* Data-plane flags on the adjacency/rewrite */
- vnet_rewrite_flags_t flags;
-
- /* When dynamically writing a multicast destination L2 addresss
- * this is the offset from the IP address at which to write in the
- * IP->MAC address translation.
- */
- u8 dst_mcast_offset;
-
- /* The mask to apply to the lower 4 bytes of the IP address before ORing
- * into the destinaiton MAC address */
- u32 dst_mcast_mask;
-
- /* Rewrite string starting at end and going backwards. */
- u8 data[0];
-}) vnet_rewrite_header_t;
-/* *INDENT-ON* */
-
-/**
- * At 16 bytes of rewrite herader we have enought space left for a IPv6
- * (40 bytes) + LISP-GPE (8 bytes) in the cache line
- */
-STATIC_ASSERT (sizeof (vnet_rewrite_header_t) <= 16,
- "Rewrite header too big");
-
-/*
- 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))
-
-always_inline void
-_vnet_fixup_one_header (vnet_rewrite_header_t * h0,
- u8 * addr, u32 addr_len, u8 * packet0)
-{
- if (PREDICT_TRUE (h0->dst_mcast_mask))
- {
- /* location to write to in the packet */
- u8 *p0 = packet0 - h0->dst_mcast_offset;
- u32 *p1 = (u32 *) p0;
- /* location to copy from in the L3 dest address */
- u32 *a0 = (u32 *) (addr + addr_len - sizeof (h0->dst_mcast_mask));
-
- *p1 |= (*a0 & h0->dst_mcast_mask);
- }
-}
-
-#define vnet_fixup_one_header(rw0,addr,p0) \
- _vnet_fixup_one_header (&((rw0).rewrite_header), \
- (u8*)(addr), sizeof((*addr)), \
- (u8*)(p0))
-
-#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);
-
-format_function_t format_vnet_rewrite;
-
-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