/* * 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. */ /* * vnet/buffer.h: vnet buffer flags * * 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_buffer_h #define included_vnet_buffer_h #include /** * Flags that are set in the high order bits of ((vlib_buffer*)b)->flags * */ #define foreach_vnet_buffer_flag \ _ (1, L4_CHECKSUM_COMPUTED, "l4-cksum-computed", 1) \ _ (2, L4_CHECKSUM_CORRECT, "l4-cksum-correct", 1) \ _ (3, VLAN_2_DEEP, "vlan-2-deep", 1) \ _ (4, VLAN_1_DEEP, "vlan-1-deep", 1) \ _ (5, SPAN_CLONE, "span-clone", 1) \ _ (6, LOOP_COUNTER_VALID, "loop-counter-valid", 0) \ _ (7, LOCALLY_ORIGINATED, "local", 1) \ _ (8, IS_IP4, "ip4", 1) \ _ (9, IS_IP6, "ip6", 1) \ _ (10, OFFLOAD, "offload", 0) \ _ (11, IS_NATED, "natted", 1) \ _ (12, L2_HDR_OFFSET_VALID, "l2_hdr_offset_valid", 0) \ _ (13, L3_HDR_OFFSET_VALID, "l3_hdr_offset_valid", 0) \ _ (14, L4_HDR_OFFSET_VALID, "l4_hdr_offset_valid", 0) \ _ (15, FLOW_REPORT, "flow-report", 1) \ _ (16, IS_DVR, "dvr", 1) \ _ (17, QOS_DATA_VALID, "qos-data-valid", 0) \ _ (18, GSO, "gso", 0) \ _ (19, AVAIL1, "avail1", 1) \ _ (20, AVAIL2, "avail2", 1) \ _ (21, AVAIL3, "avail3", 1) \ _ (22, AVAIL4, "avail4", 1) \ _ (23, AVAIL5, "avail5", 1) \ _ (24, AVAIL6, "avail6", 1) \ _ (25, AVAIL7, "avail7", 1) \ _ (26, AVAIL8, "avail8", 1) \ _ (27, AVAIL9, "avail9", 1) /* * Please allocate the FIRST available bit, redefine * AVAIL 1 ... AVAILn-1, and remove AVAILn. Please maintain the * VNET_BUFFER_FLAGS_ALL_AVAIL definition. */ #define VNET_BUFFER_FLAGS_ALL_AVAIL \ (VNET_BUFFER_F_AVAIL1 | VNET_BUFFER_F_AVAIL2 | VNET_BUFFER_F_AVAIL3 | \ VNET_BUFFER_F_AVAIL4 | VNET_BUFFER_F_AVAIL5 | VNET_BUFFER_F_AVAIL6 | \ VNET_BUFFER_F_AVAIL7 | VNET_BUFFER_F_AVAIL8 | VNET_BUFFER_F_AVAIL9) #define VNET_BUFFER_FLAGS_VLAN_BITS \ (VNET_BUFFER_F_VLAN_1_DEEP | VNET_BUFFER_F_VLAN_2_DEEP) enum { #define _(bit, name, s, v) VNET_BUFFER_F_##name = (1 << LOG2_VLIB_BUFFER_FLAG_USER(bit)), foreach_vnet_buffer_flag #undef _ }; enum { #define _(bit, name, s, v) VNET_BUFFER_F_LOG2_##name = LOG2_VLIB_BUFFER_FLAG_USER(bit), foreach_vnet_buffer_flag #undef _ }; /* Make sure that the vnet and vlib bits are disjoint */ STATIC_ASSERT (((VNET_BUFFER_FLAGS_ALL_AVAIL & VLIB_BUFFER_FLAGS_ALL) == 0), "VLIB / VNET buffer flags overlap"); #define foreach_vnet_buffer_offload_flag \ _ (0, IP_CKSUM, "offload-ip-cksum", 1) \ _ (1, TCP_CKSUM, "offload-tcp-cksum", 1) \ _ (2, UDP_CKSUM, "offload-udp-cksum", 1) \ _ (3, OUTER_IP_CKSUM, "offload-outer-ip-cksum", 1) \ _ (4, OUTER_UDP_CKSUM, "offload-outer-udp-cksum", 1) \ _ (5, TNL_VXLAN, "offload-vxlan-tunnel", 1) \ _ (6, TNL_IPIP, "offload-ipip-tunnel", 1) typedef enum { #define _(bit, name, s, v) VNET_BUFFER_OFFLOAD_F_##name = (1 << bit), foreach_vnet_buffer_offload_flag #undef _ } vnet_buffer_oflags_t; #define VNET_BUFFER_OFFLOAD_F_TNL_MASK \ (VNET_BUFFER_OFFLOAD_F_TNL_VXLAN | VNET_BUFFER_OFFLOAD_F_TNL_IPIP) #define foreach_buffer_opaque_union_subtype \ _(ip) \ _(l2) \ _(l2t) \ _(l2_classify) \ _(policer) \ _(ipsec) \ _(map) \ _(map_t) \ _(ip_frag) \ _(mpls) \ _(tcp) /* * vnet stack buffer opaque array overlay structure. * The vnet_buffer_opaque_t *must* be the same size as the * vlib_buffer_t "opaque" structure member, 32 bytes. * * When adding a union type, please add a stanza to * foreach_buffer_opaque_union_subtype (directly above). * Code in vnet_interface_init(...) verifies the size * of the union, and will announce any deviations in an * impossible-to-miss manner. */ typedef struct { u32 sw_if_index[VLIB_N_RX_TX]; i16 l2_hdr_offset; i16 l3_hdr_offset; i16 l4_hdr_offset; u8 feature_arc_index; /* offload flags */ vnet_buffer_oflags_t oflags : 8; union { /* IP4/6 buffer opaque. */ struct { /* Adjacency from destination IP address lookup [VLIB_TX]. Adjacency from source IP address lookup [VLIB_RX]. This gets set to ~0 until source lookup is performed. */ u32 adj_index[VLIB_N_RX_TX]; union { struct { /* Flow hash value for this packet computed from IP src/dst address protocol and ports. */ u32 flow_hash; union { /* next protocol */ u32 save_protocol; /* Hint for transport protocols */ u32 fib_index; }; /* Rewrite length */ u8 save_rewrite_length; union { /* sw_if_index of the local interface the buffer was received on * - if hitting a DPO_RECEIVE - it is set in ip[46]-receive. * This is ~0 if the dpo is not a receive dpo, or if the * interface is not specified (e.g. route add via local) */ u32 rx_sw_if_index; /* MFIB RPF ID */ u32 rpf_id; }; }; /* ICMP */ struct { u8 type; u8 code; u32 data; } icmp; /* reassembly */ union { /* group input/output to simplify the code, this way * we can handoff while keeping input variables intact */ struct { /* input variables */ struct { u32 next_index; /* index of next node - used by custom apps */ u32 error_next_index; /* index of next node if error - used by custom apps */ }; /* handoff variables */ struct { u16 owner_thread_index; }; }; /* output variables */ struct { union { /* shallow virtual reassembly output variables */ struct { u16 l4_src_port; /* tcp/udp/icmp src port */ u16 l4_dst_port; /* tcp/udp/icmp dst port */ u32 tcp_ack_number; u8 save_rewrite_length; u8 ip_proto; /* protocol in ip header */ u8 icmp_type_or_tcp_flags; u8 is_non_first_fragment : 1; u8 l4_layer_truncated : 7; u32 tcp_seq_number; }; /* full reassembly output variables */ struct { u16 estimated_mtu; /* estimated MTU calculated during reassembly */ }; }; }; /* internal variables used during reassembly */ struct { u16 fragment_first; u16 fragment_last; u16 range_first; u16 range_last; u32 next_range_bi; u16 ip6_frag_hdr_offset; }; } reass; }; } ip; /* * MPLS: * data copied from the MPLS header that was popped from the packet * during the look-up. */ struct { /* do not overlay w/ ip.adj_index[0,1] nor flow hash */ u32 pad[VLIB_N_RX_TX + 1]; u8 ttl; u8 exp; u8 first; u8 pyld_proto:3; /* dpo_proto_t */ u8 rsvd:5; /* Rewrite length */ u8 save_rewrite_length; /* Save the mpls header length including all label stack */ u8 mpls_hdr_length; /* * BIER - the number of bytes in the header. * the len field in the header is not authoritative. It's the * value in the table that counts. */ struct { u8 n_bytes; } bier; } mpls; /* l2 bridging path, only valid there */ struct opaque_l2 { u32 feature_bitmap; u16 bd_index; /* bridge-domain index */ u16 l2fib_sn; /* l2fib bd/int seq_num */ u8 l2_len; /* ethernet header length */ u8 shg; /* split-horizon group */ u8 bd_age; /* aging enabled */ } l2; /* l2tpv3 softwire encap, only valid there */ struct { u32 pad[4]; /* do not overlay w/ ip.adj_index[0,1] */ u8 next_index; u32 session_index; } l2t; /* L2 classify */ struct { u32 pad[4]; /* do not overlay w/ ip.fib_index nor l2 */ union { u32 table_index; u32 opaque_index; }; u32 hash; } l2_classify; /* vnet policer */ struct { u32 pad[8 - VLIB_N_RX_TX - 1]; /* to end of opaque */ u32 index; } policer; /* interface output features */ struct { /* don't overlap the adjcencies nor flow-hash */ u32 __pad[3]; u32 sad_index; u32 protect_index; u16 thread_index; } ipsec; /* MAP */ struct { u16 mtu; } map; /* MAP-T */ struct { u32 map_domain_index; struct { u32 saddr, daddr; u16 frag_offset; //Fragmentation header offset u16 l4_offset; //L4 header overall offset u8 l4_protocol; //The final protocol number } v6; //Used by ip6_map_t only u16 checksum_offset; //L4 checksum overall offset u16 mtu; //Exit MTU } map_t; /* IP Fragmentation */ struct { u32 pad[2]; /* do not overlay w/ ip.adj_index[0,1] */ u16 mtu; u8 next_index; u8 flags; //See ip_frag.h } ip_frag; /* COP - configurable junk filter(s) */ struct { /* Current configuration index. */ u32 current_config_index; } cop; /* LISP */ struct { /* overlay address family */ u16 overlay_afi; } lisp; /* TCP */ struct { u32 connection_index; union { u32 seq_number; u32 next_node_opaque; }; u32 seq_end; u32 ack_number; u16 hdr_offset; /**< offset relative to ip hdr */ u16 data_offset; /**< offset relative to ip hdr */ u16 data_len; /**< data len */ u8 flags; } tcp; /* SNAT */ struct { u32 flags; u32 required_thread_index; } snat; u32 unused[6]; }; } vnet_buffer_opaque_t; #define VNET_REWRITE_TOTAL_BYTES 128 STATIC_ASSERT (VNET_REWRITE_TOTAL_BYTES <= VLIB_BUFFER_PRE_DATA_SIZE, "VNET_REWRITE_TOTAL_BYTES too big"); STATIC_ASSERT (STRUCT_SIZE_OF (vnet_buffer_opaque_t, ip.save_rewrite_length) == STRUCT_SIZE_OF (vnet_buffer_opaque_t, ip.reass.save_rewrite_length) && STRUCT_SIZE_OF (vnet_buffer_opaque_t, ip.reass.save_rewrite_length) == STRUCT_SIZE_OF (vnet_buffer_opaque_t, mpls.save_rewrite_length) && STRUCT_SIZE_OF (vnet_buffer_opaque_t, mpls.save_rewrite_length) == 1 && VNET_REWRITE_TOTAL_BYTES < UINT8_MAX, "save_rewrite_length member must be able to hold the max value of rewrite length"); STATIC_ASSERT (STRUCT_OFFSET_OF (vnet_buffer_opaque_t, ip.save_rewrite_length) == STRUCT_OFFSET_OF (vnet_buffer_opaque_t, ip.reass.save_rewrite_length) && STRUCT_OFFSET_OF (vnet_buffer_opaque_t, mpls.save_rewrite_length) == STRUCT_OFFSET_OF (vnet_buffer_opaque_t, ip.reass.save_rewrite_length), "save_rewrite_length must be aligned so that reass doesn't overwrite it"); /* * 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. */ STATIC_ASSERT (sizeof (vnet_buffer_opaque_t) <= STRUCT_SIZE_OF (vlib_buffer_t, opaque), "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 { u16 gso_size; /* size of L4 prototol header */ u16 gso_l4_hdr_sz; i16 outer_l3_hdr_offset; i16 outer_l4_hdr_offset; }; struct { u32 arc_next; union { u32 cached_session_index; u32 cached_dst_nat_session_index; }; } nat; u32 unused[8]; } 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: */