/* * 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 = vm->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: */