
The rewrite string can be up to max_size, and max_size can be up to VNET_REWRITE_TOTAL_BYTES. Don't waste the last byte. Type: fix Change-Id: I2fb7e9873b6b4c1e6a55b172c7f753f3c5910802 Signed-off-by: Benoît Ganne <bganne@cisco.com>
283 lines
8.5 KiB
C
283 lines
8.5 KiB
C
/*
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* Copyright (c) 2015 Cisco and/or its affiliates.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* rewrite.h: packet rewrite
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*
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* Copyright (c) 2008 Eliot Dresselhaus
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef included_vnet_rewrite_h
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#define included_vnet_rewrite_h
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#include <vlib/vlib.h>
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#include <vnet/l3_types.h>
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/* Consider using vector types for speed? */
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typedef uword vnet_rewrite_data_t;
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/**
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* Flags associated with the rewrite/adjacency
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*/
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typedef enum vnet_rewrite_flags_t_
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{
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/**
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* This adjacency/interface has output features configured
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*/
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VNET_REWRITE_HAS_FEATURES = (1 << 0),
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/**
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* this adj performs IP4 over IP4 fixup
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*/
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VNET_REWRITE_FIXUP_IP4_O_4 = (1 << 1),
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/**
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* this adj performs the flow hash fixup
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*/
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VNET_REWRITE_FIXUP_FLOW_HASH = (1 << 2),
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} __attribute__ ((packed)) vnet_rewrite_flags_t;
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extern u8 *format_vnet_rewrite_flags (u8 *s, va_list *ap);
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typedef struct vnet_rewrite_header_t_
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{
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/* Interface to mark re-written packets with. */
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u32 sw_if_index;
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/* Next node to feed after packet rewrite is done. */
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u16 next_index;
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/* Number of bytes in rewrite data. */
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u16 data_bytes;
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/* Max packet size layer 3 (MTU) for output interface.
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Used for MTU check after packet rewrite. */
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u16 max_l3_packet_bytes;
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/* Data-plane flags on the adjacency/rewrite */
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vnet_rewrite_flags_t flags;
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/* When dynamically writing a multicast destination L2 addresss
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* this is the offset from the IP address at which to write in the
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* IP->MAC address translation.
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*/
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u8 dst_mcast_offset;
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/* Rewrite string starting at end and going backwards. */
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u8 data[0];
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} __clib_packed vnet_rewrite_header_t;
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/**
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* At 16 bytes of rewrite herader we have enought space left for a IPv6
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* (40 bytes) + LISP-GPE (8 bytes) in the cache line
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*/
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STATIC_ASSERT (sizeof (vnet_rewrite_header_t) <= 16,
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"Rewrite header too big");
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/*
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Helper macro for declaring rewrite string w/ given max-size.
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Typical usage:
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typedef struct {
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//
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int a, b;
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// Total adjacency is 64 bytes.
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vnet_rewrite_declare(64 - 2*sizeof(int)) rw;
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} my_adjacency_t;
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*/
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#define VNET_DECLARE_REWRITE \
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struct \
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{ \
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vnet_rewrite_header_t rewrite_header; \
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\
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u8 rewrite_data[(VNET_REWRITE_TOTAL_BYTES) - \
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sizeof (vnet_rewrite_header_t)]; \
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}
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typedef struct __rewrite_unused_t__
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{
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VNET_DECLARE_REWRITE;
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} __rewrite_unused_t;
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STATIC_ASSERT_SIZEOF (__rewrite_unused_t, 128);
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always_inline void
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vnet_rewrite_clear_data_internal (vnet_rewrite_header_t * rw, int max_size)
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{
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/* Sanity check values carefully for this clib_memset operation */
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ASSERT ((max_size > 0) && (max_size < VNET_REWRITE_TOTAL_BYTES));
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rw->data_bytes = 0;
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clib_memset (rw->data, 0xfe, max_size);
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}
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always_inline void
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vnet_rewrite_set_data_internal (vnet_rewrite_header_t * rw,
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int max_size, void *data, int data_bytes)
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{
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/* Sanity check values carefully for this clib_memset operation */
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ASSERT ((max_size > 0) && (max_size <= VNET_REWRITE_TOTAL_BYTES));
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ASSERT ((data_bytes >= 0) && (data_bytes <= max_size));
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rw->data_bytes = data_bytes;
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clib_memcpy_fast (rw->data, data, data_bytes);
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clib_memset (rw->data + data_bytes, 0xfe, max_size - data_bytes);
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}
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#define vnet_rewrite_set_data(rw,data,data_bytes) \
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vnet_rewrite_set_data_internal (&((rw).rewrite_header), \
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sizeof ((rw).rewrite_data), \
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(data), \
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(data_bytes))
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always_inline void *
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vnet_rewrite_get_data_internal (vnet_rewrite_header_t * rw, int max_size)
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{
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ASSERT (rw->data_bytes <= max_size);
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return rw->data;
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}
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#define vnet_rewrite_get_data(rw) \
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vnet_rewrite_get_data_internal (&((rw).rewrite_header), sizeof ((rw).rewrite_data))
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always_inline void
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_vnet_rewrite_one_header (const vnet_rewrite_header_t * h0,
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void *packet0, int most_likely_size)
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{
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/* 0xfefe => poisoned adjacency => crash */
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ASSERT (h0->data_bytes != 0xfefe);
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if (PREDICT_TRUE (most_likely_size == h0->data_bytes))
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{
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clib_memcpy_fast ((u8 *) packet0 - most_likely_size,
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h0->data, most_likely_size);
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}
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else
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{
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clib_memcpy_fast ((u8 *) packet0 - h0->data_bytes,
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h0->data, h0->data_bytes);
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}
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}
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always_inline void
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_vnet_rewrite_two_headers (const vnet_rewrite_header_t * h0,
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const vnet_rewrite_header_t * h1,
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void *packet0, void *packet1, int most_likely_size)
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{
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/* 0xfefe => poisoned adjacency => crash */
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ASSERT (h0->data_bytes != 0xfefe);
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ASSERT (h1->data_bytes != 0xfefe);
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if (PREDICT_TRUE
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(most_likely_size == h0->data_bytes
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&& most_likely_size == h1->data_bytes))
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{
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clib_memcpy_fast ((u8 *) packet0 - most_likely_size,
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h0->data, most_likely_size);
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clib_memcpy_fast ((u8 *) packet1 - most_likely_size,
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h1->data, most_likely_size);
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}
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else
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{
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clib_memcpy_fast ((u8 *) packet0 - h0->data_bytes,
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h0->data, h0->data_bytes);
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clib_memcpy_fast ((u8 *) packet1 - h1->data_bytes,
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h1->data, h1->data_bytes);
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}
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}
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#define vnet_rewrite_one_header(rw0,p0,most_likely_size) \
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_vnet_rewrite_one_header (&((rw0).rewrite_header), (p0), \
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(most_likely_size))
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#define vnet_rewrite_two_headers(rw0,rw1,p0,p1,most_likely_size) \
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_vnet_rewrite_two_headers (&((rw0).rewrite_header), &((rw1).rewrite_header), \
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(p0), (p1), \
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(most_likely_size))
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always_inline void
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vnet_ip_mcast_fixup_header (u32 dst_mcast_mask,
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u32 dst_mcast_offset, u32 * addr, u8 * packet0)
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{
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if (PREDICT_TRUE (0 != dst_mcast_offset))
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{
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/* location to write to in the packet */
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u8 *p0 = packet0 - dst_mcast_offset;
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u32 *p1 = (u32 *) p0;
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*p1 |= (*addr & dst_mcast_mask);
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}
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}
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#define VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST ((void *) 0)
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/** Deprecated */
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void vnet_rewrite_for_sw_interface (struct vnet_main_t *vnm,
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vnet_link_t packet_type,
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u32 sw_if_index,
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u32 node_index,
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void *dst_address,
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vnet_rewrite_header_t * rw,
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u32 max_rewrite_bytes);
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u32 vnet_tx_node_index_for_sw_interface (struct vnet_main_t *vnm,
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u32 sw_if_index);
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void vnet_rewrite_init (struct vnet_main_t *vnm,
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u32 sw_if_index,
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vnet_link_t linkt,
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u32 this_node,
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u32 next_node, vnet_rewrite_header_t * rw);
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void vnet_rewrite_update_mtu (struct vnet_main_t *vnm,
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vnet_link_t linkt, vnet_rewrite_header_t * rw);
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u8 *vnet_build_rewrite_for_sw_interface (struct vnet_main_t *vnm,
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u32 sw_if_index,
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vnet_link_t packet_type,
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const void *dst_address);
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void vnet_update_adjacency_for_sw_interface (struct vnet_main_t *vnm,
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u32 sw_if_index, u32 ai);
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format_function_t format_vnet_rewrite;
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serialize_function_t serialize_vnet_rewrite, unserialize_vnet_rewrite;
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#endif /* included_vnet_rewrite_h */
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/*
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* fd.io coding-style-patch-verification: ON
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*
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* Local Variables:
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* eval: (c-set-style "gnu")
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* End:
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*/
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