diff options
Diffstat (limited to 'src/plugins/vxlan-gpe/encap.c')
| -rw-r--r-- | src/plugins/vxlan-gpe/encap.c | 433 |
1 files changed, 433 insertions, 0 deletions
diff --git a/src/plugins/vxlan-gpe/encap.c b/src/plugins/vxlan-gpe/encap.c new file mode 100644 index 00000000000..d8bab921493 --- /dev/null +++ b/src/plugins/vxlan-gpe/encap.c @@ -0,0 +1,433 @@ +/* + * 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. + */ +/** + * @file + * @brief Functions for encapsulating VXLAN GPE tunnels + * +*/ +#include <vppinfra/error.h> +#include <vppinfra/hash.h> +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/udp/udp_inlines.h> +#include <vxlan-gpe/vxlan_gpe.h> + +/** Statistics (not really errors) */ +#define foreach_vxlan_gpe_encap_error \ +_(ENCAPSULATED, "good packets encapsulated") + +/** + * @brief VXLAN GPE encap error strings + */ +static char *vxlan_gpe_encap_error_strings[] = { +#define _(sym,string) string, + foreach_vxlan_gpe_encap_error +#undef _ +}; + +/** + * @brief Struct for VXLAN GPE errors/counters + */ +typedef enum +{ +#define _(sym,str) VXLAN_GPE_ENCAP_ERROR_##sym, + foreach_vxlan_gpe_encap_error +#undef _ + VXLAN_GPE_ENCAP_N_ERROR, +} vxlan_gpe_encap_error_t; + +/** + * @brief Struct for tracing VXLAN GPE encapsulated packets + */ +typedef struct +{ + u32 tunnel_index; +} vxlan_gpe_encap_trace_t; + +/** + * @brief Trace of packets encapsulated in VXLAN GPE + * + * @param *s + * @param *args + * + * @return *s + * + */ +u8 * +format_vxlan_gpe_encap_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 *); + vxlan_gpe_encap_trace_t *t = va_arg (*args, vxlan_gpe_encap_trace_t *); + + s = format (s, "VXLAN-GPE-ENCAP: tunnel %d", t->tunnel_index); + return s; +} + +/** + * @brief Instantiates UDP + VXLAN-GPE header then set next node to IP4|6 lookup + * + * @param *ngm + * @param *b0 + * @param *t0 contains rewrite header + * @param *next0 relative index of next dispatch function (next node) + * @param is_v4 Is this IPv4? (or IPv6) + * + */ +always_inline void +vxlan_gpe_encap_one_inline (vxlan_gpe_main_t *ngm, vlib_buffer_t *b0, + vxlan_gpe_tunnel_t *t0, u32 *next0, + ip_address_family_t af) +{ + ASSERT (sizeof (ip4_vxlan_gpe_header_t) == 36); + ASSERT (sizeof (ip6_vxlan_gpe_header_t) == 56); + + ip_udp_encap_one (ngm->vlib_main, b0, t0->rewrite, t0->rewrite_size, af, + N_AF, UDP_ENCAP_FIXUP_NONE); + next0[0] = t0->encap_next_node; +} + +/** + * @brief Instantiates UDP + VXLAN-GPE header then set next node to IP4|6 lookup for two packets + * + * @param *ngm + * @param *b0 Packet0 + * @param *b1 Packet1 + * @param *t0 contains rewrite header for Packet0 + * @param *t1 contains rewrite header for Packet1 + * @param *next0 relative index of next dispatch function (next node) for Packet0 + * @param *next1 relative index of next dispatch function (next node) for Packet1 + * @param is_v4 Is this IPv4? (or IPv6) + * + */ +always_inline void +vxlan_gpe_encap_two_inline (vxlan_gpe_main_t *ngm, vlib_buffer_t *b0, + vlib_buffer_t *b1, vxlan_gpe_tunnel_t *t0, + vxlan_gpe_tunnel_t *t1, u32 *next0, u32 *next1, + ip_address_family_t af) +{ + ASSERT (sizeof (ip4_vxlan_gpe_header_t) == 36); + ASSERT (sizeof (ip6_vxlan_gpe_header_t) == 56); + + ip_udp_encap_one (ngm->vlib_main, b0, t0->rewrite, t0->rewrite_size, af, + N_AF, UDP_ENCAP_FIXUP_NONE); + ip_udp_encap_one (ngm->vlib_main, b1, t1->rewrite, t1->rewrite_size, af, + N_AF, UDP_ENCAP_FIXUP_NONE); + next0[0] = next1[0] = t0->encap_next_node; +} + +/** + * @brief Common processing for IPv4 and IPv6 VXLAN GPE encap dispatch functions + * + * It is worth noting that other than trivial UDP forwarding (transit), VXLAN GPE + * tunnels are "establish local". This means that we don't have a TX interface as yet + * as we need to look up where the outer-header dest is. By setting the TX index in the + * buffer metadata to the encap FIB, we can do a lookup to get the adjacency and real TX. + * + * vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index; + * + * @node vxlan-gpe-input + * @param *vm + * @param *node + * @param *from_frame + * + * @return from_frame->n_vectors + * + */ +static uword +vxlan_gpe_encap (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * from_frame) +{ + u32 n_left_from, next_index, *from, *to_next; + vxlan_gpe_main_t *ngm = &vxlan_gpe_main; + vnet_main_t *vnm = ngm->vnet_main; + vnet_interface_main_t *im = &vnm->interface_main; + u32 pkts_encapsulated = 0; + u32 thread_index = vm->thread_index; + u32 stats_sw_if_index, stats_n_packets, stats_n_bytes; + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; + + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + + next_index = node->cached_next_index; + stats_sw_if_index = node->runtime_data[0]; + stats_n_packets = stats_n_bytes = 0; + vlib_get_buffers (vm, from, bufs, n_left_from); + + while (n_left_from > 0) + { + u32 n_left_to_next; + u32 sw_if_index0 = ~0, sw_if_index1 = ~0, len0, len1; + vnet_hw_interface_t *hi0, *hi1; + vxlan_gpe_tunnel_t *t0 = NULL, *t1 = NULL; + ip_address_family_t af_0 = AF_IP4, af_1 = AF_IP4; + + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (n_left_from >= 4 && n_left_to_next >= 2) + { + u32 bi0, bi1; + u32 next0, next1; + + next0 = next1 = VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP; + + /* Prefetch next iteration. */ + { + vlib_prefetch_buffer_header (b[2], LOAD); + vlib_prefetch_buffer_header (b[3], LOAD); + + CLIB_PREFETCH (b[2]->data - CLIB_CACHE_LINE_BYTES, + 2 * CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (b[3]->data - CLIB_CACHE_LINE_BYTES, + 2 * CLIB_CACHE_LINE_BYTES, LOAD); + } + + bi0 = from[0]; + bi1 = from[1]; + to_next[0] = bi0; + to_next[1] = bi1; + from += 2; + to_next += 2; + n_left_to_next -= 2; + n_left_from -= 2; + + /* get "af_0" */ + if (sw_if_index0 != vnet_buffer (b[0])->sw_if_index[VLIB_TX]) + { + sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX]; + hi0 = + vnet_get_sup_hw_interface (vnm, + vnet_buffer (b[0])->sw_if_index + [VLIB_TX]); + t0 = pool_elt_at_index (ngm->tunnels, hi0->dev_instance); + af_0 = (t0->flags & VXLAN_GPE_TUNNEL_IS_IPV4 ? AF_IP4 : AF_IP6); + } + + /* get "af_1" */ + if (sw_if_index1 != vnet_buffer (b[1])->sw_if_index[VLIB_TX]) + { + if (sw_if_index0 == vnet_buffer (b[1])->sw_if_index[VLIB_TX]) + { + sw_if_index1 = sw_if_index0; + hi1 = hi0; + t1 = t0; + af_1 = af_0; + } + else + { + sw_if_index1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX]; + hi1 = + vnet_get_sup_hw_interface (vnm, + vnet_buffer (b[1])->sw_if_index + [VLIB_TX]); + t1 = pool_elt_at_index (ngm->tunnels, hi1->dev_instance); + af_1 = + (t1->flags & VXLAN_GPE_TUNNEL_IS_IPV4 ? AF_IP4 : AF_IP6); + } + } + + if (PREDICT_TRUE (af_0 == af_1)) + { + vxlan_gpe_encap_two_inline (ngm, b[0], b[1], t0, t1, &next0, + &next1, af_0); + } + else + { + vxlan_gpe_encap_one_inline (ngm, b[0], t0, &next0, af_0); + vxlan_gpe_encap_one_inline (ngm, b[1], t1, &next1, af_1); + } + + /* Reset to look up tunnel partner in the configured FIB */ + vnet_buffer (b[0])->sw_if_index[VLIB_TX] = t0->encap_fib_index; + vnet_buffer (b[1])->sw_if_index[VLIB_TX] = t1->encap_fib_index; + vnet_buffer (b[0])->sw_if_index[VLIB_RX] = sw_if_index0; + vnet_buffer (b[1])->sw_if_index[VLIB_RX] = sw_if_index1; + pkts_encapsulated += 2; + + len0 = vlib_buffer_length_in_chain (vm, b[0]); + len1 = vlib_buffer_length_in_chain (vm, b[1]); + stats_n_packets += 2; + stats_n_bytes += len0 + len1; + + /* Batch stats increment on the same vxlan tunnel so counter is not + incremented per packet. Note stats are still incremented for deleted + and admin-down tunnel where packets are dropped. It is not worthwhile + to check for this rare case and affect normal path performance. */ + if (PREDICT_FALSE ((sw_if_index0 != stats_sw_if_index) + || (sw_if_index1 != stats_sw_if_index))) + { + stats_n_packets -= 2; + stats_n_bytes -= len0 + len1; + if (sw_if_index0 == sw_if_index1) + { + if (stats_n_packets) + vlib_increment_combined_counter + (im->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_TX, thread_index, + stats_sw_if_index, stats_n_packets, stats_n_bytes); + stats_sw_if_index = sw_if_index0; + stats_n_packets = 2; + stats_n_bytes = len0 + len1; + } + else + { + vlib_increment_combined_counter (im->combined_sw_if_counters + + + VNET_INTERFACE_COUNTER_TX, + thread_index, sw_if_index0, + 1, len0); + vlib_increment_combined_counter (im->combined_sw_if_counters + + + VNET_INTERFACE_COUNTER_TX, + thread_index, sw_if_index1, + 1, len1); + } + } + + if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) + { + vxlan_gpe_encap_trace_t *tr = + vlib_add_trace (vm, node, b[0], sizeof (*tr)); + tr->tunnel_index = t0 - ngm->tunnels; + } + + if (PREDICT_FALSE (b[1]->flags & VLIB_BUFFER_IS_TRACED)) + { + vxlan_gpe_encap_trace_t *tr = vlib_add_trace (vm, node, b[1], + sizeof (*tr)); + tr->tunnel_index = t1 - ngm->tunnels; + } + b += 2; + + 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) + { + u32 bi0; + u32 next0 = VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP; + + bi0 = from[0]; + to_next[0] = bi0; + from += 1; + to_next += 1; + n_left_from -= 1; + n_left_to_next -= 1; + + /* get "af_0" */ + if (sw_if_index0 != vnet_buffer (b[0])->sw_if_index[VLIB_TX]) + { + sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX]; + hi0 = + vnet_get_sup_hw_interface (vnm, + vnet_buffer (b[0])->sw_if_index + [VLIB_TX]); + + t0 = pool_elt_at_index (ngm->tunnels, hi0->dev_instance); + + af_0 = (t0->flags & VXLAN_GPE_TUNNEL_IS_IPV4 ? AF_IP4 : AF_IP6); + } + + vxlan_gpe_encap_one_inline (ngm, b[0], t0, &next0, af_0); + + /* Reset to look up tunnel partner in the configured FIB */ + vnet_buffer (b[0])->sw_if_index[VLIB_TX] = t0->encap_fib_index; + vnet_buffer (b[0])->sw_if_index[VLIB_RX] = sw_if_index0; + pkts_encapsulated++; + + len0 = vlib_buffer_length_in_chain (vm, b[0]); + stats_n_packets += 1; + stats_n_bytes += len0; + + /* Batch stats increment on the same vxlan tunnel so counter is not + * incremented per packet. Note stats are still incremented for deleted + * and admin-down tunnel where packets are dropped. It is not worthwhile + * to check for this rare case and affect normal path performance. */ + if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index)) + { + stats_n_packets -= 1; + stats_n_bytes -= len0; + if (stats_n_packets) + vlib_increment_combined_counter (im->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_TX, + thread_index, + stats_sw_if_index, + stats_n_packets, + stats_n_bytes); + stats_n_packets = 1; + stats_n_bytes = len0; + stats_sw_if_index = sw_if_index0; + } + if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) + { + vxlan_gpe_encap_trace_t *tr = vlib_add_trace (vm, node, b[0], + sizeof (*tr)); + tr->tunnel_index = t0 - ngm->tunnels; + } + b += 1; + + 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, node->node_index, + VXLAN_GPE_ENCAP_ERROR_ENCAPSULATED, + pkts_encapsulated); + /* Increment any remaining batch stats */ + if (stats_n_packets) + { + vlib_increment_combined_counter (im->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_TX, + thread_index, stats_sw_if_index, + stats_n_packets, stats_n_bytes); + node->runtime_data[0] = stats_sw_if_index; + } + + return from_frame->n_vectors; +} + +VLIB_REGISTER_NODE (vxlan_gpe_encap_node) = { + .function = vxlan_gpe_encap, + .name = "vxlan-gpe-encap", + .vector_size = sizeof (u32), + .format_trace = format_vxlan_gpe_encap_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(vxlan_gpe_encap_error_strings), + .error_strings = vxlan_gpe_encap_error_strings, + + .n_next_nodes = VXLAN_GPE_ENCAP_N_NEXT, + + .next_nodes = { + [VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP] = "ip4-lookup", + [VXLAN_GPE_ENCAP_NEXT_IP6_LOOKUP] = "ip6-lookup", + [VXLAN_GPE_ENCAP_NEXT_DROP] = "error-drop", + }, +}; + + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |