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/*
* l2_vtr.h : layer 2 vlan tag rewrite processing
*
* Copyright (c) 2013 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.
*/
#ifndef included_vnet_l2_vtr_h
#define included_vnet_l2_vtr_h
#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/ethernet/packet.h>
#include <vnet/l2/l2_vtr.h>
/* VTR config options for API and CLI support */
typedef enum
{
L2_VTR_DISABLED,
L2_VTR_PUSH_1,
L2_VTR_PUSH_2,
L2_VTR_POP_1,
L2_VTR_POP_2,
L2_VTR_TRANSLATE_1_1,
L2_VTR_TRANSLATE_1_2,
L2_VTR_TRANSLATE_2_1,
L2_VTR_TRANSLATE_2_2
} l2_vtr_op_t;
/**
* Per-interface vlan tag rewrite configuration
* There will be one instance of this struct for each sw_if_index
* for both input vtr and output vtr
*/
typedef struct
{
union
{
/*
* Up to two vlan tags to push.
* if there is only one vlan tag to push, it is in tags[1].
*/
ethernet_vlan_header_tv_t tags[2];
u64 raw_tags;
};
union
{
struct
{
u8 push_bytes; /* number of bytes to push for up to 2 vlans (0,4,8) */
u8 pop_bytes; /* number of bytes to pop for up to 2 vlans (0,4,8) */
};
u16 push_and_pop_bytes; /* if 0 then the feature is disabled */
};
} vtr_config_t;
/**
* Perform the configured tag rewrite on the packet.
* Return 0 if ok, 1 if packet should be dropped (e.g. tried to pop
* too many tags)
*/
always_inline u32
l2_vtr_process (vlib_buffer_t * b0, vtr_config_t * config)
{
u64 temp_8;
u32 temp_4;
u8 *eth;
eth = vlib_buffer_get_current (b0);
/* copy the 12B dmac and smac to a temporary location */
temp_8 = *((u64 *) eth);
temp_4 = *((u32 *) (eth + 8));
/* adjust for popped tags */
eth += config->pop_bytes;
/* if not enough tags to pop then drop packet */
if (PREDICT_FALSE ((vnet_buffer (b0)->l2.l2_len - 12) < config->pop_bytes))
{
return 1;
}
/* copy the 2 new tags to the start of the packet */
*((u64 *) (eth + 12 - 8)) = config->raw_tags;
/* TODO: set cos bits */
/* adjust for pushed tags: */
eth -= config->push_bytes;
/* copy the 12 dmac and smac back to the packet */
*((u64 *) eth) = temp_8;
*((u32 *) (eth + 8)) = temp_4;
/* Update l2_len */
vnet_buffer (b0)->l2.l2_len +=
(word) config->push_bytes - (word) config->pop_bytes;
/* Update vlan tag count */
ethernet_buffer_adjust_vlan_count_by_bytes (b0,
(word) config->push_bytes -
(word) config->pop_bytes);
/* Update packet len */
vlib_buffer_advance (b0,
(word) config->pop_bytes - (word) config->push_bytes);
return 0;
}
/*
* Perform the egress pre-vlan tag rewrite EFP Filter check.
* The post-vlan tag rewrite check is a separate graph node.
*
* This check insures that a packet being output to an interface
* (before output vtr is performed) has vlan tags that match those
* on a packet received from that interface (after vtr has been performed).
* This means verifying that any tags pushed by input vtr are present
* on the packet.
*
* Return 0 if ok, 1 if packet should be dropped.
* This function should be passed the input vtr config for the interface.
*/
always_inline u8
l2_efp_filter_process (vlib_buffer_t * b0, vtr_config_t * in_config)
{
u8 *eth;
u64 packet_tags;
u64 tag_mask;
eth = vlib_buffer_get_current (b0);
/*
* If there are 2 tags pushed, they must match config->tags[0] and
* config->tags[1].
* If there is one tag pushed, it must match config->tag[1].
* If there are 0 tags pushed, the check passes.
*/
/* mask for two vlan id and ethertypes, no cos bits */
tag_mask = clib_net_to_host_u64 (0xFFFF0FFFFFFF0FFF);
/* mask for one vlan id and ethertype, no cos bits */
tag_mask =
(in_config->push_bytes ==
4) ? clib_net_to_host_u64 (0xFFFF0FFF) : tag_mask;
/* mask for always match */
tag_mask = (in_config->push_bytes == 0) ? 0 : tag_mask;
/*
* Read 8B from the packet, getting the proper set of vlan tags
* For 0 push bytes, the address doesn't matter since the mask
* clears the data to 0.
*/
packet_tags = *((u64 *) (eth + 4 + in_config->push_bytes));
/* Check if the packet tags match the configured tags */
return (packet_tags & tag_mask) != in_config->raw_tags;
}
/**
* Configure vtag tag rewrite on the given interface.
* Return 1 if there is an error, 0 if ok
*/
u32 l2vtr_configure (vlib_main_t * vlib_main,
vnet_main_t * vnet_main,
u32 sw_if_index,
u32 vtr_op, u32 push_dot1q, u32 vtr_tag1, u32 vtr_tag2);
/**
* Get vtag tag rewrite on the given interface.
* Return 1 if there is an error, 0 if ok
*/
u32 l2vtr_get (vlib_main_t * vlib_main,
vnet_main_t * vnet_main,
u32 sw_if_index,
u32 * vtr_op,
u32 * push_dot1q, u32 * vtr_tag1, u32 * vtr_tag2);
#endif /* included_vnet_l2_vtr_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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