diff options
Diffstat (limited to 'src/plugins/srv6-am/node.c')
| -rw-r--r-- | src/plugins/srv6-am/node.c | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/src/plugins/srv6-am/node.c b/src/plugins/srv6-am/node.c new file mode 100644 index 00000000000..8643aa42532 --- /dev/null +++ b/src/plugins/srv6-am/node.c @@ -0,0 +1,355 @@ +/* + * 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. + */ +#include <vlib/vlib.h> +#include <vnet/vnet.h> +#include <vppinfra/error.h> +#include <srv6-am/am.h> + + +/******************************* Packet tracing *******************************/ + +typedef struct +{ + u32 localsid_index; +} srv6_am_localsid_trace_t; + +typedef struct +{ + ip6_address_t src, dst; +} srv6_am_rewrite_trace_t; + +static u8 * +format_srv6_am_localsid_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 *); + srv6_am_localsid_trace_t *t = va_arg (*args, srv6_am_localsid_trace_t *); + + return format (s, "SRv6-AM-localsid: localsid_index %d", t->localsid_index); +} + +static u8 * +format_srv6_am_rewrite_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 *); + srv6_am_rewrite_trace_t *t = va_arg (*args, srv6_am_rewrite_trace_t *); + + return format (s, "SRv6-AM-rewrite: src %U dst %U", + format_ip6_address, &t->src, format_ip6_address, &t->dst); +} + + +/***************************** Node registration ******************************/ + +vlib_node_registration_t srv6_am_rewrite_node; + + +/****************************** Packet counters *******************************/ + +#define foreach_srv6_am_rewrite_counter \ +_(PROCESSED, "srv6-am rewritten packets") \ +_(NO_SRH, "(Error) No SRH.") + +typedef enum +{ +#define _(sym,str) SRV6_AM_REWRITE_COUNTER_##sym, + foreach_srv6_am_rewrite_counter +#undef _ + SRV6_AM_REWRITE_N_COUNTERS, +} srv6_am_rewrite_counters; + +static char *srv6_am_rewrite_counter_strings[] = { +#define _(sym,string) string, + foreach_srv6_am_rewrite_counter +#undef _ +}; + + +/********************************* Next nodes *********************************/ + +typedef enum +{ + SRV6_AM_LOCALSID_NEXT_ERROR, + SRV6_AM_LOCALSID_NEXT_REWRITE, + SRV6_AM_LOCALSID_N_NEXT, +} srv6_am_localsid_next_t; + +typedef enum +{ + SRV6_AM_REWRITE_NEXT_ERROR, + SRV6_AM_REWRITE_NEXT_LOOKUP, + SRV6_AM_REWRITE_N_NEXT, +} srv6_am_rewrite_next_t; + + +/******************************* Local SID node *******************************/ + +/** + * @brief SRv6 masquerading. + */ +static_always_inline void +end_am_processing (vlib_buffer_t * b0, + ip6_header_t * ip0, + ip6_sr_header_t * sr0, + ip6_sr_localsid_t * ls0, u32 * next0) +{ + ip6_address_t *new_dst0; + + if (PREDICT_FALSE (ip0->protocol != IP_PROTOCOL_IPV6_ROUTE || + sr0->type != ROUTING_HEADER_TYPE_SR)) + { + *next0 = SRV6_AM_LOCALSID_NEXT_ERROR; + return; + } + + if (PREDICT_FALSE (sr0->segments_left == 0)) + { + *next0 = SRV6_AM_LOCALSID_NEXT_ERROR; + return; + } + + /* Decrement Segments Left */ + sr0->segments_left -= 1; + + /* Set Destination Address to Last Segment (index 0) */ + new_dst0 = (ip6_address_t *) (sr0->segments); + ip0->dst_address.as_u64[0] = new_dst0->as_u64[0]; + ip0->dst_address.as_u64[1] = new_dst0->as_u64[1]; + + /* Set Xconnect adjacency to VNF */ + vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0->nh_adj; +} + +/** + * @brief Graph node for applying SRv6 masquerading. + */ +static uword +srv6_am_localsid_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * frame) +{ + ip6_sr_main_t *sm = &sr_main; + u32 n_left_from, next_index, *from, *to_next; + u32 cnt_packets = 0; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + + u32 thread_index = vlib_get_thread_index (); + + while (n_left_from > 0) + { + u32 n_left_to_next; + + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + /* TODO: Dual/quad loop */ + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t *b0; + ip6_header_t *ip0 = 0; + ip6_sr_header_t *sr0; + ip6_sr_localsid_t *ls0; + u32 next0 = SRV6_AM_LOCALSID_NEXT_REWRITE; + + bi0 = from[0]; + to_next[0] = bi0; + from += 1; + to_next += 1; + n_left_from -= 1; + n_left_to_next -= 1; + + b0 = vlib_get_buffer (vm, bi0); + ip0 = vlib_buffer_get_current (b0); + sr0 = (ip6_sr_header_t *) (ip0 + 1); + + /* Lookup the SR End behavior based on IP DA (adj) */ + ls0 = pool_elt_at_index (sm->localsids, + vnet_buffer (b0)->ip.adj_index[VLIB_TX]); + + /* SRH processing */ + end_am_processing (b0, ip0, sr0, ls0, &next0); + + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + srv6_am_localsid_trace_t *tr = + vlib_add_trace (vm, node, b0, sizeof *tr); + tr->localsid_index = ls0 - sm->localsids; + } + + /* This increments the SRv6 per LocalSID counters. */ + vlib_increment_combined_counter (((next0 == + SRV6_AM_LOCALSID_NEXT_ERROR) ? + &(sm->sr_ls_invalid_counters) : + &(sm->sr_ls_valid_counters)), + thread_index, ls0 - sm->localsids, + 1, vlib_buffer_length_in_chain (vm, + b0)); + + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, + n_left_to_next, bi0, next0); + + cnt_packets++; + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + return frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (srv6_am_localsid_node) = { + .function = srv6_am_localsid_fn, + .name = "srv6-am-localsid", + .vector_size = sizeof (u32), + .format_trace = format_srv6_am_localsid_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_next_nodes = SRV6_AM_LOCALSID_N_NEXT, + .next_nodes = { + [SRV6_AM_LOCALSID_NEXT_REWRITE] = "ip6-rewrite", + [SRV6_AM_LOCALSID_NEXT_ERROR] = "error-drop", + }, +}; +/* *INDENT-ON* */ + + +/******************************* Rewriting node *******************************/ + +/** + * @brief SRv6 de-masquerading. + */ +static_always_inline void +end_am_rewriting (vlib_node_runtime_t * node, + vlib_buffer_t * b0, + ip6_header_t * ip0, ip6_sr_header_t * sr0, u32 * next0) +{ + if (PREDICT_FALSE (ip0->protocol != IP_PROTOCOL_IPV6_ROUTE || + sr0->type != ROUTING_HEADER_TYPE_SR)) + { + b0->error = node->errors[SRV6_AM_REWRITE_COUNTER_NO_SRH]; + *next0 = SRV6_AM_REWRITE_NEXT_ERROR; + return; + } + + /* Restore Destination Address to active segment (index SL) */ + if (sr0->segments_left != 0) + { + ip6_address_t *new_dst0; + new_dst0 = (ip6_address_t *) (sr0->segments) + sr0->segments_left; + ip0->dst_address.as_u64[0] = new_dst0->as_u64[0]; + ip0->dst_address.as_u64[1] = new_dst0->as_u64[1]; + } +} + +/** + * @brief Graph node for applying SRv6 de-masquerading. + */ +static uword +srv6_am_rewrite_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * frame) +{ + u32 n_left_from, next_index, *from, *to_next; + u32 cnt_packets = 0; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + + while (n_left_from > 0) + { + u32 n_left_to_next; + + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + /* TODO: Dual/quad loop */ + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t *b0; + ip6_header_t *ip0 = 0; + ip6_sr_header_t *sr0; + u32 next0 = SRV6_AM_REWRITE_NEXT_LOOKUP; + + bi0 = from[0]; + to_next[0] = bi0; + from += 1; + to_next += 1; + n_left_from -= 1; + n_left_to_next -= 1; + + b0 = vlib_get_buffer (vm, bi0); + ip0 = vlib_buffer_get_current (b0); + sr0 = (ip6_sr_header_t *) (ip0 + 1); + + /* SRH processing */ + end_am_rewriting (node, b0, ip0, sr0, &next0); + + if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) && + PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + srv6_am_rewrite_trace_t *tr = + vlib_add_trace (vm, node, b0, sizeof *tr); + clib_memcpy (tr->src.as_u8, ip0->src_address.as_u8, + sizeof tr->src.as_u8); + clib_memcpy (tr->dst.as_u8, ip0->dst_address.as_u8, + sizeof tr->dst.as_u8); + } + + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, + n_left_to_next, bi0, next0); + + cnt_packets++; + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + /* Update counters */ + vlib_node_increment_counter (vm, srv6_am_rewrite_node.index, + SRV6_AM_REWRITE_COUNTER_PROCESSED, + cnt_packets); + + return frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (srv6_am_rewrite_node) = { + .function = srv6_am_rewrite_fn, + .name = "srv6-am-rewrite", + .vector_size = sizeof (u32), + .format_trace = format_srv6_am_rewrite_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_errors = SRV6_AM_REWRITE_N_COUNTERS, + .error_strings = srv6_am_rewrite_counter_strings, + .n_next_nodes = SRV6_AM_REWRITE_N_NEXT, + .next_nodes = { + [SRV6_AM_REWRITE_NEXT_LOOKUP] = "ip6-lookup", + [SRV6_AM_REWRITE_NEXT_ERROR] = "error-drop", + }, +}; +/* *INDENT-ON* */ + +/* +* fd.io coding-style-patch-verification: ON +* +* Local Variables: +* eval: (c-set-style "gnu") +* End: +*/ |