/* * 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 <vnet/pg/pg.h> #include <vppinfra/error.h> #include <srv6-localsid/srv6_localsid_sample.h> typedef struct { u32 localsid_index; } srv6_localsid_sample_trace_t; /* packet trace format function */ static u8 * format_srv6_localsid_sample_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_localsid_sample_trace_t * t = va_arg (*args, srv6_localsid_sample_trace_t *); s = format (s, "SRv6-sample-localsid: localsid_index %d\n", t->localsid_index); return s; } vlib_node_registration_t srv6_localsid_sample_node; #define foreach_srv6_localsid_counter \ _(PROCESSED, "srv6-sample-localsid processed packets") \ _(NO_SRH, "(Error) No SRH.") typedef enum { #define _(sym,str) SRV6_LOCALSID_COUNTER_##sym, foreach_srv6_localsid_counter #undef _ SRV6_LOCALSID_N_COUNTERS, } srv6_localsid_sample_counters; static char * srv6_localsid_counter_strings[] = { #define _(sym,string) string, foreach_srv6_localsid_counter #undef _ }; typedef enum { SRV6_SAMPLE_LOCALSID_NEXT_ERROR, SRV6_SAMPLE_LOCALSID_NEXT_IP6LOOKUP, SRV6_SAMPLE_LOCALSID_N_NEXT, } srv6_localsid_sample_next_t; /** * @brief Function doing End processing. */ static_always_inline void end_srh_processing (vlib_node_runtime_t * node, vlib_buffer_t * b0, ip6_header_t * ip0, ip6_sr_header_t * sr0, ip6_sr_localsid_t * ls0, u32 * next0, u8 psp, ip6_ext_header_t * prev0) { ip6_address_t *new_dst0; if (PREDICT_TRUE (sr0->type == ROUTING_HEADER_TYPE_SR)) { if (sr0->segments_left == 1 && psp) { u32 new_l0, sr_len; u64 *copy_dst0, *copy_src0; u32 copy_len_u64s0 = 0; ip0->dst_address.as_u64[0] = sr0->segments->as_u64[0]; ip0->dst_address.as_u64[1] = sr0->segments->as_u64[1]; /* Remove the SRH taking care of the rest of IPv6 ext header */ if (prev0) prev0->next_hdr = sr0->protocol; else ip0->protocol = sr0->protocol; sr_len = ip6_ext_header_len (sr0); vlib_buffer_advance (b0, sr_len); new_l0 = clib_net_to_host_u16 (ip0->payload_length) - sr_len; ip0->payload_length = clib_host_to_net_u16 (new_l0); copy_src0 = (u64 *) ip0; copy_dst0 = copy_src0 + (sr0->length + 1); /* number of 8 octet units to copy * By default in absence of extension headers it is equal to length of ip6 header * With extension headers it number of 8 octet units of ext headers preceding * SR header */ copy_len_u64s0 = (((u8 *) sr0 - (u8 *) ip0) - sizeof (ip6_header_t)) >> 3; copy_dst0[4 + copy_len_u64s0] = copy_src0[4 + copy_len_u64s0]; copy_dst0[3 + copy_len_u64s0] = copy_src0[3 + copy_len_u64s0]; copy_dst0[2 + copy_len_u64s0] = copy_src0[2 + copy_len_u64s0]; copy_dst0[1 + copy_len_u64s0] = copy_src0[1 + copy_len_u64s0]; copy_dst0[0 + copy_len_u64s0] = copy_src0[0 + copy_len_u64s0]; int i; for (i = copy_len_u64s0 - 1; i >= 0; i--) { copy_dst0[i] = copy_src0[i]; } if (ls0->behavior == SR_BEHAVIOR_X) { vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0->nh_adj; *next0 = SR_LOCALSID_NEXT_IP6_REWRITE; } else if(ls0->behavior == SR_BEHAVIOR_T) { vnet_buffer (b0)->sw_if_index[VLIB_TX] = ls0->vrf_index; } } else if (PREDICT_TRUE(sr0->segments_left > 0)) { sr0->segments_left -= 1; new_dst0 = (ip6_address_t *) (sr0->segments); new_dst0 += 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]; if (ls0->behavior == SR_BEHAVIOR_X) { vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0->nh_adj; *next0 = SR_LOCALSID_NEXT_IP6_REWRITE; } else if(ls0->behavior == SR_BEHAVIOR_T) { vnet_buffer (b0)->sw_if_index[VLIB_TX] = ls0->vrf_index; } } else { *next0 = SR_LOCALSID_NEXT_ERROR; b0->error = node->errors[SR_LOCALSID_ERROR_NO_MORE_SEGMENTS]; } } else { /* Error. Routing header of type != SR */ *next0 = SR_LOCALSID_NEXT_ERROR; b0->error = node->errors[SR_LOCALSID_ERROR_NO_SRH]; } } /* * @brief SRv6 Sample Localsid graph node * WARNING: YOU MUST DO THE DUAL LOOP */ static uword srv6_localsid_sample_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, * from, * to_next; u32 next_index; u32 pkts_swapped = 0; ip6_sr_main_t * sm = &sr_main; 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); 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_ext_header_t *prev0 u32 next0 = SRV6_SAMPLE_LOCALSID_NEXT_IP6LOOKUP; ip6_sr_localsid_t *ls0; srv6_localsid_sample_per_sid_memory_t *ls0_mem; 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]); ls0_mem = ls0->plugin_mem; /* SRH processing */ ip6_ext_header_find_t (ip0, prev0, sr0, IP_PROTOCOL_IPV6_ROUTE); end_decaps_srh_processing (node, b0, ip0, sr0, ls0, &next0); /* ==================================================================== */ /* INSERT CODE HERE */ /* Example starts here */ //In this example we are changing the next VRF table by the one in CLI vnet_buffer(b0)->sw_if_index[VLIB_TX] = ls0_mem->fib_table; /* Example finishes here */ /* ==================================================================== */ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { srv6_localsid_sample_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_SAMPLE_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); pkts_swapped ++; } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } return frame->n_vectors; } VLIB_REGISTER_NODE (srv6_localsid_sample_node) = { .function = srv6_localsid_sample_fn, .name = "srv6-localsid-sample", .vector_size = sizeof (u32), .format_trace = format_srv6_localsid_sample_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = SRV6_LOCALSID_N_COUNTERS, .error_strings = srv6_localsid_counter_strings, .n_next_nodes = SRV6_SAMPLE_LOCALSID_N_NEXT, .next_nodes = { [SRV6_SAMPLE_LOCALSID_NEXT_IP6LOOKUP] = "ip6-lookup", [SRV6_SAMPLE_LOCALSID_NEXT_ERROR] = "error-drop", }, };