vpp - Vector Packet Processing

Age	Commit message (Expand)	Author	Files	Lines
2018-08-09	DOCS: General cleanup (did not move any sections)	andrew	1	-18/+20
2018-08-01	docs: change code blocks from "shell" to "console"	John DeNisco	1	-14/+14
2018-07-26	Initial commit of Sphinx docs	John DeNisco	1	-0/+123

/* * Copyright (c) 2016 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. */ /** * @file * @brief L2-GRE over IPSec packet processing. * * Add GRE header to thr packet and send it to the esp-encrypt node. */ #include <vnet/vnet.h> #include <vnet/ipsec-gre/ipsec_gre.h> ipsec_gre_main_t ipsec_gre_main; /** * @brief IPv4 and GRE header union. * */ typedef struct { union { ip4_and_gre_header_t ip4_and_gre; u64 as_u64[3]; }; } ip4_and_gre_union_t; /** * @brief Packet trace. * */ typedef struct { u32 tunnel_id; /**< Tunnel-id / index in tunnel vector */ u32 length; /**< pkt length */ ip4_address_t src; /**< tunnel src IPv4 address */ ip4_address_t dst; /**< tunnel dst IPv4 address */ u32 sa_id; /**< tunnel IPSec SA id */ } ipsec_gre_tx_trace_t; u8 * format_ipsec_gre_tx_trace (u8 * s, va_list * args) { CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); ipsec_gre_tx_trace_t *t = va_arg (*args, ipsec_gre_tx_trace_t *); s = format (s, "GRE: tunnel %d len %d src %U dst %U sa-id %d", t->tunnel_id, clib_net_to_host_u16 (t->length), format_ip4_address, &t->src.as_u8, format_ip4_address, &t->dst.as_u8, t->sa_id); return s; } /** * @brief IPSec-GRE tunnel interface tx function. * * Add GRE header to the packet. * * @param vm vlib_main_t corresponding to the current thread. * @param node vlib_node_runtime_t data for this node. * @param frame vlib_frame_t whose contents should be dispatched. * * @par Graph mechanics: buffer metadata, next index usage * * Uses: * - <code>node->runtime_data</code> * - Match tunnel by <code>rd->dev_instance</code> in IPSec-GRE tunnels * pool. * * Sets: * - <code>vnet_buffer(b)->output_features.ipsec_sad_index</code> * - Set IPSec Security Association for packet encryption. * - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code> * - Reset output sw_if_index. * * Nexd Index: * - Dispatches the packet to the esp-encrypt node. */ static uword ipsec_gre_interface_tx (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { ipsec_gre_main_t *igm = &ipsec_gre_main; u32 next_index; u32 *from, *to_next, n_left_from, n_left_to_next; vnet_interface_output_runtime_t *rd = (void *) node->runtime_data; ipsec_gre_tunnel_t *t = pool_elt_at_index (igm->tunnels, rd->dev_instance); /* Vector of buffer / pkt indices we're supposed to process */ from = vlib_frame_vector_args (frame); /* Number of buffers / pkts */ n_left_from = frame->n_vectors; /* Speculatively send the first buffer to the last disposition we used */ next_index = node->cached_next_index; while (n_left_from > 0) { /* set up to enqueue to our disposition with index = next_index */ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); /* * As long as we have enough pkts left to process two pkts * and prefetch two pkts... */ while (n_left_from >= 4 && n_left_to_next >= 2) { vlib_buffer_t *b0, *b1; ip4_header_t *ip0, *ip1; ip4_and_gre_union_t *h0, *h1; u32 bi0, next0, bi1, next1; __attribute__ ((unused)) u8 error0, error1; u16 gre_protocol0, gre_protocol1; /* Prefetch the next iteration */ { vlib_buffer_t *p2, *p3; p2 = vlib_get_buffer (vm, from[2]); p3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); /* * Prefetch packet data. We expect to overwrite * the inbound L2 header with an ip header and a * gre header. Might want to prefetch the last line * of rewrite space as well; need profile data */ CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE); CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE); } /* Pick up the next two buffer indices */ bi0 = from[0]; bi1 = from[1]; /* Speculatively enqueue them where we sent the last buffer */ to_next[0] = bi0; to_next[1] = bi1; from += 2; to_next += 2; n_left_to_next -= 2; n_left_from -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); ip0 = vlib_buffer_get_current (b0); gre_protocol0 = clib_net_to_host_u16 (0x01); ip1 = vlib_buffer_get_current (b1); gre_protocol1 = clib_net_to_host_u16 (0x01); vlib_buffer_advance (b0, -sizeof (*h0)); vlib_buffer_advance (b1, -sizeof (*h1)); h0 = vlib_buffer_get_current (b0); h1 = vlib_buffer_get_current (b1); h0->as_u64[0] = 0; h0->as_u64[1] = 0; h0->as_u64[2] = 0; h1->as_u64[0] = 0; h1->as_u64[1] = 0; h1->as_u64[2] = 0; ip0 = &h0->ip4_and_gre.ip4; h0->ip4_and_gre.gre.protocol = gre_protocol0; ip0->ip_version_and_header_length = 0x45; ip0->ttl = 254; ip0->protocol = IP_PROTOCOL_GRE; ip1 = &h1->ip4_and_gre.ip4; h1->ip4_and_gre.gre.protocol = gre_protocol1; ip1->ip_version_and_header_length = 0x45; ip1->ttl = 254; ip1->protocol = IP_PROTOCOL_GRE; ip0->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)); ip1->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)); ip0->src_address.as_u32 = t->tunnel_src.as_u32; ip1->src_address.as_u32 = t->tunnel_src.as_u32; ip0->dst_address.as_u32 = t->tunnel_dst.as_u32; ip1->dst_address.as_u32 = t->tunnel_dst.as_u32; ip0->checksum = ip4_header_checksum (ip0); ip1->checksum = ip4_header_checksum (ip1); vnet_buffer (b0)->sw_if_index[VLIB_RX] = vnet_buffer (b0)->sw_if_index[VLIB_TX]; vnet_buffer (b1)->sw_if_index[VLIB_RX] = vnet_buffer (b1)->sw_if_index[VLIB_TX]; vnet_buffer (b0)->ipsec.sad_index = t->local_sa; vnet_buffer (b1)->ipsec.sad_index = t->local_sa; vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0; next0 = IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT; next1 = IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT; error0 = IPSEC_GRE_ERROR_NONE; error1 = IPSEC_GRE_ERROR_NONE; if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->tunnel_id = t - igm->tunnels; tr->length = ip0->length; tr->src.as_u32 = ip0->src_address.as_u32; tr->dst.as_u32 = ip0->dst_address.as_u32; tr->sa_id = t->local_sa_id; } if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED)) { ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node, b1, sizeof (*tr)); tr->tunnel_id = t - igm->tunnels; tr->length = ip1->length; tr->src.as_u32 = ip1->src_address.as_u32; tr->dst.as_u32 = ip1->dst_address.as_u32; tr->sa_id = t->local_sa_id; } vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } while (n_left_from > 0 && n_left_to_next > 0) { vlib_buffer_t *b0; ip4_header_t *ip0; ip4_and_gre_union_t *h0; u32 bi0, next0; __attribute__ ((unused)) u8 error0; u16 gre_protocol0; bi0 = to_next[0] = from[0]; from += 1; n_left_from -= 1; to_next += 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); gre_protocol0 = clib_net_to_host_u16 (0x01); vlib_buffer_advance (b0, -sizeof (*h0)); h0 = vlib_buffer_get_current (b0); h0->as_u64[0] = 0; h0->as_u64[1] = 0; h0->as_u64[2] = 0; ip0 = &h0->ip4_and_gre.ip4; h0->ip4_and_gre.gre.protocol = gre_protocol0; ip0->ip_version_and_header_length = 0x45; ip0->ttl = 254; ip0->protocol = IP_PROTOCOL_GRE; ip0->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)); ip0->src_address.as_u32 = t->tunnel_src.as_u32; ip0->dst_address.as_u32 = t->tunnel_dst.as_u32; ip0->checksum = ip4_header_checksum (ip0); vnet_buffer (b0)->sw_if_index[VLIB_RX] = vnet_buffer (b0)->sw_if_index[VLIB_TX]; vnet_buffer (b0)->ipsec.sad_index = t->local_sa; vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; next0 = IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT; error0 = IPSEC_GRE_ERROR_NONE; if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->tunnel_id = t - igm->tunnels; tr->length = ip0->length; tr->src.as_u32 = ip0->src_address.as_u32; tr->dst.as_u32 = ip0->dst_address.as_u32; tr->sa_id = t->local_sa_id; } vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } vlib_node_increment_counter (vm, ipsec_gre_input_node.index, IPSEC_GRE_ERROR_PKTS_ENCAP, frame->n_vectors); return frame->n_vectors; } static clib_error_t * ipsec_gre_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags) { if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) vnet_hw_interface_set_flags (vnm, hw_if_index, VNET_HW_INTERFACE_FLAG_LINK_UP); else vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */ ); return /* no error */ 0; } static u8 * format_ipsec_gre_tunnel_name (u8 * s, va_list * args) { u32 dev_instance = va_arg (*args, u32); return format (s, "ipsec-gre%d", dev_instance); } static u8 * format_ipsec_gre_device (u8 * s, va_list * args) { u32 dev_instance = va_arg (*args, u32); CLIB_UNUSED (int verbose) = va_arg (*args, int); s = format (s, "IPSEC-GRE tunnel: id %d\n", dev_instance); return s; } /* *INDENT-OFF* */ VNET_DEVICE_CLASS (ipsec_gre_device_class) = { .name = "IPSec GRE tunnel device", .format_device_name = format_ipsec_gre_tunnel_name, .format_device = format_ipsec_gre_device, .format_tx_trace = format_ipsec_gre_tx_trace, .tx_function = ipsec_gre_interface_tx, .admin_up_down_function = ipsec_gre_interface_admin_up_down, }; VLIB_DEVICE_TX_FUNCTION_MULTIARCH (ipsec_gre_device_class, ipsec_gre_interface_tx) VNET_HW_INTERFACE_CLASS (ipsec_gre_hw_interface_class) = { .name = "IPSEC-GRE", }; /* *INDENT-ON* */ static clib_error_t * ipsec_gre_init (vlib_main_t * vm) { ipsec_gre_main_t *igm = &ipsec_gre_main; clib_error_t *error; memset (igm, 0, sizeof (igm[0])); igm->vlib_main = vm; igm->vnet_main = vnet_get_main (); if ((error = vlib_call_init_function (vm, ip_main_init))) return error; if ((error = vlib_call_init_function (vm, ip4_lookup_init))) return error; igm->tunnel_by_key = hash_create (0, sizeof (uword)); return vlib_call_init_function (vm, ipsec_gre_input_init); } VLIB_INIT_FUNCTION (ipsec_gre_init); ipsec_gre_main_t * ipsec_gre_get_main (vlib_main_t * vm) { vlib_call_init_function (vm, ipsec_gre_init); return &ipsec_gre_main; } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */