860916617d
This patch adds some fixes and improvements: Fixes bug where save_rewrite_length gets overwritten on reassembly handoff. Fixes bug where duplicate fragments could cause a reassembly context to be lost, because the race losing thread would remove bihash entry created by winning thread. Improves tracing by adding more events. Adds extended shallow reassembly. This is a toggleable option, which if turned on will cause reassembly to wait for both first and last fragments to calculate total IP payload length. Furthermore it'll store a local copy of first fragment and necessary data to retrieve it in vnet_buffer2. This allows downstream features to access full L3/L4 headers when dealing with fragments. Type: fix Change-Id: I81695070533410c5815291dbc65ea71c87e3ae05 Signed-off-by: Klement Sekera <klement.sekera@gmail.com>
569 lines
17 KiB
C
569 lines
17 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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* vnet/buffer.h: vnet buffer flags
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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_buffer_h
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#define included_vnet_buffer_h
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#include <vlib/vlib.h>
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/**
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* Flags that are set in the high order bits of ((vlib_buffer*)b)->flags
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*
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*/
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#define foreach_vnet_buffer_flag \
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_ (1, L4_CHECKSUM_COMPUTED, "l4-cksum-computed", 1) \
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_ (2, L4_CHECKSUM_CORRECT, "l4-cksum-correct", 1) \
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_ (3, VLAN_2_DEEP, "vlan-2-deep", 1) \
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_ (4, VLAN_1_DEEP, "vlan-1-deep", 1) \
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_ (5, SPAN_CLONE, "span-clone", 1) \
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_ (6, LOOP_COUNTER_VALID, "loop-counter-valid", 0) \
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_ (7, LOCALLY_ORIGINATED, "local", 1) \
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_ (8, IS_IP4, "ip4", 1) \
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_ (9, IS_IP6, "ip6", 1) \
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_ (10, OFFLOAD, "offload", 0) \
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_ (11, IS_NATED, "natted", 1) \
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_ (12, L2_HDR_OFFSET_VALID, "l2_hdr_offset_valid", 0) \
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_ (13, L3_HDR_OFFSET_VALID, "l3_hdr_offset_valid", 0) \
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_ (14, L4_HDR_OFFSET_VALID, "l4_hdr_offset_valid", 0) \
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_ (15, FLOW_REPORT, "flow-report", 1) \
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_ (16, IS_DVR, "dvr", 1) \
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_ (17, QOS_DATA_VALID, "qos-data-valid", 0) \
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_ (18, GSO, "gso", 0) \
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_ (19, AVAIL1, "avail1", 1) \
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_ (20, AVAIL2, "avail2", 1) \
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_ (21, AVAIL3, "avail3", 1) \
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_ (22, AVAIL4, "avail4", 1) \
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_ (23, AVAIL5, "avail5", 1) \
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_ (24, AVAIL6, "avail6", 1) \
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_ (25, AVAIL7, "avail7", 1) \
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_ (26, AVAIL8, "avail8", 1) \
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_ (27, AVAIL9, "avail9", 1)
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/*
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* Please allocate the FIRST available bit, redefine
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* AVAIL 1 ... AVAILn-1, and remove AVAILn. Please maintain the
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* VNET_BUFFER_FLAGS_ALL_AVAIL definition.
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*/
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#define VNET_BUFFER_FLAGS_ALL_AVAIL \
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(VNET_BUFFER_F_AVAIL1 | VNET_BUFFER_F_AVAIL2 | VNET_BUFFER_F_AVAIL3 | \
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VNET_BUFFER_F_AVAIL4 | VNET_BUFFER_F_AVAIL5 | VNET_BUFFER_F_AVAIL6 | \
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VNET_BUFFER_F_AVAIL7 | VNET_BUFFER_F_AVAIL8 | VNET_BUFFER_F_AVAIL9)
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#define VNET_BUFFER_FLAGS_VLAN_BITS \
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(VNET_BUFFER_F_VLAN_1_DEEP | VNET_BUFFER_F_VLAN_2_DEEP)
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enum
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{
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#define _(bit, name, s, v) VNET_BUFFER_F_##name = (1 << LOG2_VLIB_BUFFER_FLAG_USER(bit)),
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foreach_vnet_buffer_flag
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#undef _
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};
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enum
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{
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#define _(bit, name, s, v) VNET_BUFFER_F_LOG2_##name = LOG2_VLIB_BUFFER_FLAG_USER(bit),
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foreach_vnet_buffer_flag
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#undef _
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};
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/* Make sure that the vnet and vlib bits are disjoint */
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STATIC_ASSERT (((VNET_BUFFER_FLAGS_ALL_AVAIL & VLIB_BUFFER_FLAGS_ALL) == 0),
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"VLIB / VNET buffer flags overlap");
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#define foreach_vnet_buffer_offload_flag \
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_ (0, IP_CKSUM, "offload-ip-cksum", 1) \
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_ (1, TCP_CKSUM, "offload-tcp-cksum", 1) \
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_ (2, UDP_CKSUM, "offload-udp-cksum", 1) \
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_ (3, OUTER_IP_CKSUM, "offload-outer-ip-cksum", 1) \
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_ (4, OUTER_UDP_CKSUM, "offload-outer-udp-cksum", 1) \
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_ (5, TNL_VXLAN, "offload-vxlan-tunnel", 1) \
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_ (6, TNL_IPIP, "offload-ipip-tunnel", 1)
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typedef enum
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{
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#define _(bit, name, s, v) VNET_BUFFER_OFFLOAD_F_##name = (1 << bit),
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foreach_vnet_buffer_offload_flag
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#undef _
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} vnet_buffer_oflags_t;
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#define VNET_BUFFER_OFFLOAD_F_TNL_MASK \
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(VNET_BUFFER_OFFLOAD_F_TNL_VXLAN | VNET_BUFFER_OFFLOAD_F_TNL_IPIP)
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#define foreach_buffer_opaque_union_subtype \
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_(ip) \
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_(l2) \
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_(l2t) \
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_(l2_classify) \
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_(policer) \
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_(ipsec) \
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_(map) \
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_(map_t) \
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_(ip_frag) \
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_(mpls) \
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_(tcp)
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/*
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* vnet stack buffer opaque array overlay structure.
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* The vnet_buffer_opaque_t *must* be the same size as the
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* vlib_buffer_t "opaque" structure member, 32 bytes.
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*
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* When adding a union type, please add a stanza to
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* foreach_buffer_opaque_union_subtype (directly above).
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* Code in vnet_interface_init(...) verifies the size
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* of the union, and will announce any deviations in an
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* impossible-to-miss manner.
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*/
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typedef struct
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{
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u32 sw_if_index[VLIB_N_RX_TX];
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i16 l2_hdr_offset;
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i16 l3_hdr_offset;
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i16 l4_hdr_offset;
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u8 feature_arc_index;
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/* offload flags */
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vnet_buffer_oflags_t oflags : 8;
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union
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{
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/* IP4/6 buffer opaque. */
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struct
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{
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/* Adjacency from destination IP address lookup [VLIB_TX].
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Adjacency from source IP address lookup [VLIB_RX].
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This gets set to ~0 until source lookup is performed. */
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u32 adj_index[VLIB_N_RX_TX];
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union
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{
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struct
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{
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/* Flow hash value for this packet computed from IP src/dst address
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protocol and ports. */
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u32 flow_hash;
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union
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{
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/* next protocol */
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u32 save_protocol;
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/* Hint for transport protocols */
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u32 fib_index;
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};
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/* Rewrite length */
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u8 save_rewrite_length;
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union
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{
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/* sw_if_index of the local interface the buffer was received on
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* - if hitting a DPO_RECEIVE - it is set in ip[46]-receive.
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* This is ~0 if the dpo is not a receive dpo, or if the
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* interface is not specified (e.g. route add via local) */
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u32 rx_sw_if_index;
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/* MFIB RPF ID */
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u32 rpf_id;
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};
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};
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/* ICMP */
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struct
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{
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u8 type;
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u8 code;
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u32 data;
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} icmp;
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/* reassembly */
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union
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{
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/* group input/output to simplify the code, this way
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* we can handoff while keeping input variables intact */
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struct
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{
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/* input variables */
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u32 next_index; /* index of next node - used by custom apps */
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u32 error_next_index; /* index of next node if error - used by
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custom apps */
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u8 _save_rewrite_length;
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/* handoff variables */
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u16 owner_thread_index;
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};
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/* output variables */
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struct
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{
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union
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{
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/* shallow virtual reassembly output variables */
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struct
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{
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u16 l4_src_port; /* tcp/udp/icmp src port */
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u16 l4_dst_port; /* tcp/udp/icmp dst port */
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u32 tcp_ack_number;
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u8 save_rewrite_length;
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u8 ip_proto; /* protocol in ip header */
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u8 icmp_type_or_tcp_flags;
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u8 is_non_first_fragment : 1;
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u8 l4_hdr_truncated : 1;
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u8 unused : 6;
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u32 tcp_seq_number;
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};
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/* full reassembly output variables */
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struct
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{
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u16 estimated_mtu; /* estimated MTU calculated during reassembly */
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};
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};
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};
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/* internal variables used during reassembly */
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struct
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{
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u16 fragment_first;
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u16 fragment_last;
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u16 range_first;
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u16 range_last;
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u32 next_range_bi;
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u16 ip6_frag_hdr_offset;
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};
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} reass;
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};
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} ip;
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/*
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* MPLS:
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* data copied from the MPLS header that was popped from the packet
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* during the look-up.
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*/
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struct
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{
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/* do not overlay w/ ip.adj_index[0,1] nor flow hash */
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u32 pad[VLIB_N_RX_TX + 1];
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u8 ttl;
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u8 exp;
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u8 first;
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u8 pyld_proto:3; /* dpo_proto_t */
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u8 rsvd:5;
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/* Rewrite length */
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u8 save_rewrite_length;
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/* Save the mpls header length including all label stack */
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u8 mpls_hdr_length;
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/*
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* BIER - the number of bytes in the header.
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* the len field in the header is not authoritative. It's the
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* value in the table that counts.
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*/
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struct
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{
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u8 n_bytes;
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} bier;
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} mpls;
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/* l2 bridging path, only valid there */
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struct opaque_l2
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{
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u32 feature_bitmap;
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u16 bd_index; /* bridge-domain index */
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u16 l2fib_sn; /* l2fib bd/int seq_num */
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u8 l2_len; /* ethernet header length */
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u8 shg; /* split-horizon group */
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u8 bd_age; /* aging enabled */
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} l2;
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/* l2tpv3 softwire encap, only valid there */
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struct
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{
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u32 pad[4]; /* do not overlay w/ ip.adj_index[0,1] */
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u8 next_index;
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u32 session_index;
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} l2t;
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/* L2 classify */
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struct
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{
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u32 pad[4]; /* do not overlay w/ ip.fib_index nor l2 */
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union
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{
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u32 table_index;
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u32 opaque_index;
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};
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u32 hash;
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} l2_classify;
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/* vnet policer */
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struct
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{
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u32 pad[8 - VLIB_N_RX_TX - 1]; /* to end of opaque */
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u32 index;
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} policer;
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/* interface output features */
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struct
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{
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/* don't overlap the adjcencies nor flow-hash */
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u32 __pad[3];
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u32 sad_index;
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u32 protect_index;
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u16 thread_index;
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} ipsec;
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/* MAP */
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struct
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{
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u16 mtu;
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} map;
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/* MAP-T */
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struct
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{
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u32 map_domain_index;
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struct
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{
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u32 saddr, daddr;
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u16 frag_offset; //Fragmentation header offset
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u16 l4_offset; //L4 header overall offset
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u8 l4_protocol; //The final protocol number
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} v6; //Used by ip6_map_t only
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u16 checksum_offset; //L4 checksum overall offset
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u16 mtu; //Exit MTU
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} map_t;
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/* IP Fragmentation */
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struct
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{
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u32 pad[2]; /* do not overlay w/ ip.adj_index[0,1] */
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u16 mtu;
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u8 next_index;
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u8 flags; //See ip_frag.h
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} ip_frag;
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/* COP - configurable junk filter(s) */
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struct
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{
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/* Current configuration index. */
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u32 current_config_index;
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} cop;
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/* LISP */
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struct
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{
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/* overlay address family */
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u16 overlay_afi;
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} lisp;
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/* TCP */
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struct
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{
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u32 connection_index;
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union
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{
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u32 seq_number;
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u32 next_node_opaque;
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};
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u32 seq_end;
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u32 ack_number;
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u16 hdr_offset; /**< offset relative to ip hdr */
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u16 data_offset; /**< offset relative to ip hdr */
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u16 data_len; /**< data len */
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u8 flags;
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} tcp;
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/* SNAT */
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struct
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{
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u32 flags;
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u32 required_thread_index;
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} snat;
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u32 unused[6];
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};
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} vnet_buffer_opaque_t;
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#define VNET_REWRITE_TOTAL_BYTES 128
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STATIC_ASSERT (VNET_REWRITE_TOTAL_BYTES <= VLIB_BUFFER_PRE_DATA_SIZE,
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"VNET_REWRITE_TOTAL_BYTES too big");
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STATIC_ASSERT (
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STRUCT_SIZE_OF (vnet_buffer_opaque_t, ip.save_rewrite_length) ==
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STRUCT_SIZE_OF (vnet_buffer_opaque_t, ip.reass.save_rewrite_length) &&
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STRUCT_SIZE_OF (vnet_buffer_opaque_t, ip.save_rewrite_length) ==
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STRUCT_SIZE_OF (vnet_buffer_opaque_t, ip.reass._save_rewrite_length) &&
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STRUCT_SIZE_OF (vnet_buffer_opaque_t, ip.reass.save_rewrite_length) ==
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STRUCT_SIZE_OF (vnet_buffer_opaque_t, mpls.save_rewrite_length) &&
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STRUCT_SIZE_OF (vnet_buffer_opaque_t, mpls.save_rewrite_length) == 1 &&
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VNET_REWRITE_TOTAL_BYTES < UINT8_MAX,
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|
"save_rewrite_length member must be able to hold the max value of rewrite "
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|
"length");
|
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STATIC_ASSERT (
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STRUCT_OFFSET_OF (vnet_buffer_opaque_t, ip.save_rewrite_length) ==
|
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STRUCT_OFFSET_OF (vnet_buffer_opaque_t, ip.reass.save_rewrite_length) &&
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STRUCT_OFFSET_OF (vnet_buffer_opaque_t, ip.save_rewrite_length) ==
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STRUCT_OFFSET_OF (vnet_buffer_opaque_t, ip.reass._save_rewrite_length) &&
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STRUCT_OFFSET_OF (vnet_buffer_opaque_t, mpls.save_rewrite_length) ==
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STRUCT_OFFSET_OF (vnet_buffer_opaque_t, ip.reass.save_rewrite_length),
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|
"save_rewrite_length must be aligned so that reass doesn't overwrite it");
|
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|
|
/*
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|
* The opaque field of the vlib_buffer_t is interpreted as a
|
|
* vnet_buffer_opaque_t. Hence it should be big enough to accommodate one.
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|
*/
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|
STATIC_ASSERT (sizeof (vnet_buffer_opaque_t) <=
|
|
STRUCT_SIZE_OF (vlib_buffer_t, opaque),
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|
"VNET buffer meta-data too large for vlib_buffer");
|
|
|
|
#define vnet_buffer(b) ((vnet_buffer_opaque_t *) (b)->opaque)
|
|
|
|
/* Full cache line (64 bytes) of additional space */
|
|
typedef struct
|
|
{
|
|
/**
|
|
* QoS marking data that needs to persist from the recording nodes
|
|
* (nominally in the ingress path) to the marking node (in the
|
|
* egress path)
|
|
*/
|
|
struct
|
|
{
|
|
u8 bits;
|
|
u8 source;
|
|
} qos;
|
|
|
|
u8 loop_counter;
|
|
u8 pad[5]; /* unused */
|
|
|
|
/**
|
|
* The L4 payload size set on input on GSO enabled interfaces
|
|
* when we receive a GSO packet (a chain of buffers with the first one
|
|
* having GSO bit set), and needs to persist all the way to the interface-output,
|
|
* in case the egress interface is not GSO-enabled - then we need to perform
|
|
* the segmentation, and use this value to cut the payload appropriately.
|
|
*/
|
|
struct
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|
{
|
|
u16 gso_size;
|
|
/* size of L4 prototol header */
|
|
u16 gso_l4_hdr_sz;
|
|
i16 outer_l3_hdr_offset;
|
|
i16 outer_l4_hdr_offset;
|
|
};
|
|
|
|
struct
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|
{
|
|
u32 arc_next;
|
|
union
|
|
{
|
|
u32 cached_session_index;
|
|
u32 cached_dst_nat_session_index;
|
|
};
|
|
} nat;
|
|
|
|
struct
|
|
{
|
|
/*
|
|
* Shallow virtual reassembly output values.
|
|
* Only populated if extended reassembly enabled via
|
|
* ipX_sv_reass_enable_disable_extended().
|
|
*/
|
|
struct
|
|
{
|
|
u32 thread_index;
|
|
u32 pool_index;
|
|
u32 id;
|
|
} reass;
|
|
} ip;
|
|
|
|
u32 unused[5];
|
|
} vnet_buffer_opaque2_t;
|
|
|
|
#define vnet_buffer2(b) ((vnet_buffer_opaque2_t *) (b)->opaque2)
|
|
|
|
/*
|
|
* The opaque2 field of the vlib_buffer_t is interpreted as a
|
|
* vnet_buffer_opaque2_t. Hence it should be big enough to accommodate one.
|
|
*/
|
|
STATIC_ASSERT (sizeof (vnet_buffer_opaque2_t) ==
|
|
STRUCT_SIZE_OF (vlib_buffer_t, opaque2),
|
|
"VNET buffer opaque2 meta-data too large for vlib_buffer");
|
|
|
|
#define gso_mtu_sz(b) (vnet_buffer2(b)->gso_size + \
|
|
vnet_buffer2(b)->gso_l4_hdr_sz + \
|
|
vnet_buffer(b)->l4_hdr_offset - \
|
|
vnet_buffer (b)->l3_hdr_offset)
|
|
|
|
format_function_t format_vnet_buffer_no_chain;
|
|
format_function_t format_vnet_buffer;
|
|
format_function_t format_vnet_buffer_offload;
|
|
format_function_t format_vnet_buffer_flags;
|
|
format_function_t format_vnet_buffer_opaque;
|
|
format_function_t format_vnet_buffer_opaque2;
|
|
|
|
static_always_inline void
|
|
vnet_buffer_offload_flags_set (vlib_buffer_t *b, vnet_buffer_oflags_t oflags)
|
|
{
|
|
if (b->flags & VNET_BUFFER_F_OFFLOAD)
|
|
{
|
|
/* add a flag to existing offload */
|
|
vnet_buffer (b)->oflags |= oflags;
|
|
}
|
|
else
|
|
{
|
|
/* no offload yet: reset offload flags to new value */
|
|
vnet_buffer (b)->oflags = oflags;
|
|
b->flags |= VNET_BUFFER_F_OFFLOAD;
|
|
}
|
|
}
|
|
|
|
static_always_inline void
|
|
vnet_buffer_offload_flags_clear (vlib_buffer_t *b, vnet_buffer_oflags_t oflags)
|
|
{
|
|
vnet_buffer (b)->oflags &= ~oflags;
|
|
if (0 == vnet_buffer (b)->oflags)
|
|
b->flags &= ~VNET_BUFFER_F_OFFLOAD;
|
|
}
|
|
|
|
#endif /* included_vnet_buffer_h */
|
|
|
|
/*
|
|
* fd.io coding-style-patch-verification: ON
|
|
*
|
|
* Local Variables:
|
|
* eval: (c-set-style "gnu")
|
|
* End:
|
|
*/
|