769145cdbc
Type: fix Change-Id: I5a5461652f8115fa1270e20f748178fb5f5450f2 Signed-off-by: Klement Sekera <ksekera@cisco.com>
261 lines
8.0 KiB
C
261 lines
8.0 KiB
C
/*
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* Copyright (c) 2015 Cisco and/or its affiliates.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <vlib/vlib.h>
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#include <vnet/vnet.h>
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#include <vnet/pg/pg.h>
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#include <vppinfra/error.h>
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#include <srv6-localsid/srv6_localsid_sample.h>
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typedef struct {
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u32 localsid_index;
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} srv6_localsid_sample_trace_t;
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/* packet trace format function */
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static u8 * format_srv6_localsid_sample_trace (u8 * s, va_list * args)
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{
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CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
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CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
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srv6_localsid_sample_trace_t * t = va_arg (*args, srv6_localsid_sample_trace_t *);
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s = format (s, "SRv6-sample-localsid: localsid_index %d\n",
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t->localsid_index);
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return s;
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}
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vlib_node_registration_t srv6_localsid_sample_node;
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#define foreach_srv6_localsid_counter \
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_(PROCESSED, "srv6-sample-localsid processed packets") \
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_(NO_SRH, "(Error) No SRH.")
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typedef enum {
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#define _(sym,str) SRV6_LOCALSID_COUNTER_##sym,
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foreach_srv6_localsid_counter
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#undef _
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SRV6_LOCALSID_N_COUNTERS,
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} srv6_localsid_sample_counters;
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static char * srv6_localsid_counter_strings[] = {
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#define _(sym,string) string,
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foreach_srv6_localsid_counter
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#undef _
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};
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typedef enum {
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SRV6_SAMPLE_LOCALSID_NEXT_ERROR,
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SRV6_SAMPLE_LOCALSID_NEXT_IP6LOOKUP,
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SRV6_SAMPLE_LOCALSID_N_NEXT,
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} srv6_localsid_sample_next_t;
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/**
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* @brief Function doing End processing.
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*/
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static_always_inline void
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end_srh_processing (vlib_node_runtime_t * node,
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vlib_buffer_t * b0,
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ip6_header_t * ip0,
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ip6_sr_header_t * sr0,
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ip6_sr_localsid_t * ls0,
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u32 * next0,
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u8 psp,
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ip6_ext_header_t * prev0)
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{
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ip6_address_t *new_dst0;
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if (PREDICT_TRUE (sr0->type == ROUTING_HEADER_TYPE_SR))
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{
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if (sr0->segments_left == 1 && psp)
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{
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u32 new_l0, sr_len;
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u64 *copy_dst0, *copy_src0;
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u32 copy_len_u64s0 = 0;
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ip0->dst_address.as_u64[0] = sr0->segments->as_u64[0];
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ip0->dst_address.as_u64[1] = sr0->segments->as_u64[1];
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/* Remove the SRH taking care of the rest of IPv6 ext header */
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if (prev0)
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prev0->next_hdr = sr0->protocol;
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else
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ip0->protocol = sr0->protocol;
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sr_len = ip6_ext_header_len (sr0);
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vlib_buffer_advance (b0, sr_len);
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new_l0 = clib_net_to_host_u16 (ip0->payload_length) - sr_len;
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ip0->payload_length = clib_host_to_net_u16 (new_l0);
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copy_src0 = (u64 *) ip0;
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copy_dst0 = copy_src0 + (sr0->length + 1);
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/* number of 8 octet units to copy
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* By default in absence of extension headers it is equal to length of ip6 header
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* With extension headers it number of 8 octet units of ext headers preceding
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* SR header
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*/
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copy_len_u64s0 =
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(((u8 *) sr0 - (u8 *) ip0) - sizeof (ip6_header_t)) >> 3;
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copy_dst0[4 + copy_len_u64s0] = copy_src0[4 + copy_len_u64s0];
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copy_dst0[3 + copy_len_u64s0] = copy_src0[3 + copy_len_u64s0];
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copy_dst0[2 + copy_len_u64s0] = copy_src0[2 + copy_len_u64s0];
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copy_dst0[1 + copy_len_u64s0] = copy_src0[1 + copy_len_u64s0];
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copy_dst0[0 + copy_len_u64s0] = copy_src0[0 + copy_len_u64s0];
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int i;
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for (i = copy_len_u64s0 - 1; i >= 0; i--)
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{
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copy_dst0[i] = copy_src0[i];
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}
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if (ls0->behavior == SR_BEHAVIOR_X)
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{
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vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0->nh_adj;
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*next0 = SR_LOCALSID_NEXT_IP6_REWRITE;
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}
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else if(ls0->behavior == SR_BEHAVIOR_T)
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{
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vnet_buffer (b0)->sw_if_index[VLIB_TX] = ls0->vrf_index;
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}
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}
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else if (PREDICT_TRUE(sr0->segments_left > 0))
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{
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sr0->segments_left -= 1;
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new_dst0 = (ip6_address_t *) (sr0->segments);
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new_dst0 += sr0->segments_left;
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ip0->dst_address.as_u64[0] = new_dst0->as_u64[0];
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ip0->dst_address.as_u64[1] = new_dst0->as_u64[1];
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if (ls0->behavior == SR_BEHAVIOR_X)
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{
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vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0->nh_adj;
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*next0 = SR_LOCALSID_NEXT_IP6_REWRITE;
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}
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else if(ls0->behavior == SR_BEHAVIOR_T)
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{
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vnet_buffer (b0)->sw_if_index[VLIB_TX] = ls0->vrf_index;
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}
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}
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else
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{
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*next0 = SR_LOCALSID_NEXT_ERROR;
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b0->error = node->errors[SR_LOCALSID_ERROR_NO_MORE_SEGMENTS];
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}
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}
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else
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{
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/* Error. Routing header of type != SR */
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*next0 = SR_LOCALSID_NEXT_ERROR;
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b0->error = node->errors[SR_LOCALSID_ERROR_NO_SRH];
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}
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}
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/*
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* @brief SRv6 Sample Localsid graph node
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* WARNING: YOU MUST DO THE DUAL LOOP
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*/
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static uword
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srv6_localsid_sample_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
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{
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u32 n_left_from, * from, * to_next;
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u32 next_index;
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u32 pkts_swapped = 0;
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ip6_sr_main_t * sm = &sr_main;
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from = vlib_frame_vector_args (frame);
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n_left_from = frame->n_vectors;
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next_index = node->cached_next_index;
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u32 thread_index = vlib_get_thread_index ();
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while (n_left_from > 0)
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{
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u32 n_left_to_next;
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vlib_get_next_frame (vm, node, next_index,
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to_next, n_left_to_next);
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while (n_left_from > 0 && n_left_to_next > 0)
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{
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u32 bi0;
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vlib_buffer_t * b0;
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ip6_header_t * ip0 = 0;
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ip6_sr_header_t * sr0;
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u32 next0 = SRV6_SAMPLE_LOCALSID_NEXT_IP6LOOKUP;
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ip6_sr_localsid_t *ls0;
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srv6_localsid_sample_per_sid_memory_t *ls0_mem;
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bi0 = from[0];
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to_next[0] = bi0;
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from += 1;
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to_next += 1;
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n_left_from -= 1;
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n_left_to_next -= 1;
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b0 = vlib_get_buffer (vm, bi0);
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ip0 = vlib_buffer_get_current (b0);
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sr0 = (ip6_sr_header_t *)(ip0+1);
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/* Lookup the SR End behavior based on IP DA (adj) */
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ls0 = pool_elt_at_index (sm->localsids, vnet_buffer(b0)->ip.adj_index[VLIB_TX]);
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ls0_mem = ls0->plugin_mem;
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/* SRH processing */
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sr0 = ip6_ext_header_find (vm, b0, ip0, IP_PROTOCOL_IPV6_ROUTE, NULL);
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end_decaps_srh_processing (node, b0, ip0, sr0, ls0, &next0);
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/* ==================================================================== */
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/* INSERT CODE HERE */
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/* Example starts here */
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//In this example we are changing the next VRF table by the one in CLI
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vnet_buffer(b0)->sw_if_index[VLIB_TX] = ls0_mem->fib_table;
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/* Example finishes here */
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/* ==================================================================== */
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if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
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{
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srv6_localsid_sample_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
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tr->localsid_index = ls0 - sm->localsids;
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}
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/* This increments the SRv6 per LocalSID counters.*/
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vlib_increment_combined_counter
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(((next0 == SRV6_SAMPLE_LOCALSID_NEXT_ERROR) ? &(sm->sr_ls_invalid_counters) : &(sm->sr_ls_valid_counters)),
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thread_index,
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ls0 - sm->localsids,
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1, vlib_buffer_length_in_chain (vm, b0));
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vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
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n_left_to_next, bi0, next0);
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pkts_swapped ++;
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}
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vlib_put_next_frame (vm, node, next_index, n_left_to_next);
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}
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return frame->n_vectors;
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}
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VLIB_REGISTER_NODE (srv6_localsid_sample_node) = {
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.function = srv6_localsid_sample_fn,
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.name = "srv6-localsid-sample",
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.vector_size = sizeof (u32),
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.format_trace = format_srv6_localsid_sample_trace,
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.type = VLIB_NODE_TYPE_INTERNAL,
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.n_errors = SRV6_LOCALSID_N_COUNTERS,
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.error_strings = srv6_localsid_counter_strings,
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.n_next_nodes = SRV6_SAMPLE_LOCALSID_N_NEXT,
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.next_nodes = {
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[SRV6_SAMPLE_LOCALSID_NEXT_IP6LOOKUP] = "ip6-lookup",
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[SRV6_SAMPLE_LOCALSID_NEXT_ERROR] = "error-drop",
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},
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};
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