diff options
Diffstat (limited to 'nsh-plugin/nsh-md2-ioam/md2_ioam_transit.c')
| -rw-r--r-- | nsh-plugin/nsh-md2-ioam/md2_ioam_transit.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/nsh-plugin/nsh-md2-ioam/md2_ioam_transit.c b/nsh-plugin/nsh-md2-ioam/md2_ioam_transit.c new file mode 100644 index 0000000..72176a8 --- /dev/null +++ b/nsh-plugin/nsh-md2-ioam/md2_ioam_transit.c @@ -0,0 +1,191 @@ + /* + * Copyright (c) 2017 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 <vppinfra/error.h> +#include <vppinfra/hash.h> +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vnet/udp/udp.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/lisp-gpe/lisp_gpe.h> +#include <vnet/lisp-gpe/lisp_gpe_packet.h> +#include <nsh/nsh.h> +#include <nsh/nsh_packet.h> +#include <nsh-md2-ioam/nsh_md2_ioam.h> +#include <nsh-md2-ioam/nsh_md2_ioam_util.h> +#include <vnet/fib/ip6_fib.h> +#include <vnet/fib/ip4_fib.h> +#include <vnet/fib/fib_entry.h> + +/* Statistics (not really errors) */ +#define foreach_nsh_md2_ioam_encap_transit_error \ +_(ENCAPSULATED, "good packets encapsulated") + +static char *nsh_md2_ioam_encap_transit_error_strings[] = { +#define _(sym,string) string, + foreach_nsh_md2_ioam_encap_transit_error +#undef _ +}; + +typedef enum +{ +#define _(sym,str) NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_ERROR_##sym, + foreach_nsh_md2_ioam_encap_transit_error +#undef _ + NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_N_ERROR, +} nsh_md2_ioam_encap_transit_error_t; + +typedef enum +{ + NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_OUTPUT, + NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_DROP, + NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_N_NEXT +} nsh_md2_ioam_encap_transit_next_t; + + +/* *INDENT-OFF* */ +VNET_FEATURE_INIT (nsh_md2_ioam_encap_transit, static) = +{ + .arc_name = "ip4-output", + .node_name = "nsh-md2-ioam-encap-transit", + .runs_before = VNET_FEATURES ("adj-midchain-tx"), +}; +/* *INDENT-ON* */ + + +static uword +nsh_md2_ioam_encap_transit (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * from_frame) +{ + u32 n_left_from, next_index, *from, *to_next; + + from = vlib_frame_vector_args (from_frame); + n_left_from = 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); + + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t *b0; + u32 next0 = NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_OUTPUT; + + bi0 = from[0]; + to_next[0] = bi0; + from += 1; + to_next += 1; + n_left_from -= 1; + n_left_to_next -= 1; + ip4_header_t *ip0; + u32 iph_offset = 0; + + b0 = vlib_get_buffer (vm, bi0); + iph_offset = vnet_buffer (b0)->ip.save_rewrite_length; + ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) + + iph_offset); + + /* just forward non ipv4 packets */ + if (PREDICT_FALSE + ((ip0->ip_version_and_header_length & 0xF0) == 0x40)) + { + /* ipv4 packets */ + udp_header_t *udp_hdr0 = (udp_header_t *) (ip0 + 1); + if (PREDICT_FALSE + ((ip0->protocol == IP_PROTOCOL_UDP) && + (clib_net_to_host_u16 (udp_hdr0->dst_port) == + UDP_DST_PORT_lisp_gpe))) + { + + /* Check the iOAM header */ + lisp_gpe_header_t *lisp_gpe_hdr0 = (lisp_gpe_header_t *) (udp_hdr0 + 1); + nsh_base_header_t *nsh_hdr = (nsh_base_header_t *)(lisp_gpe_hdr0 + 1); + + if (PREDICT_FALSE + (lisp_gpe_hdr0->next_protocol == LISP_GPE_NEXT_PROTO_NSH) && + (nsh_hdr->md_type == 2 )) + { + uword *t = NULL; + nsh_md2_ioam_main_t *hm = &nsh_md2_ioam_main; + fib_prefix_t key4; + memset (&key4, 0, sizeof (key4)); + key4.fp_proto = FIB_PROTOCOL_IP4; + key4.fp_addr.ip4.as_u32 = ip0->dst_address.as_u32; + t = hash_get_mem (hm->dst_by_ip4, &key4); + if (t) + { + vlib_buffer_advance (b0, + (word) (sizeof + (ethernet_header_t))); + nsh_md2_ioam_encap_decap_ioam_v4_one_inline (vm, node, + b0, + &next0, + NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_DROP, + 1 + /* use_adj */ + ); + vlib_buffer_advance (b0, + -(word) (sizeof + (ethernet_header_t))); + } + } + } + } + + 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); + } + + return from_frame->n_vectors; +} + +extern u8 * format_nsh_node_map_trace (u8 * s, va_list * args); +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (nsh_md2_ioam_encap_transit_node) = { + .function = nsh_md2_ioam_encap_transit, + .name = "nsh-md2-ioam-encap-transit", + .vector_size = sizeof (u32), + .format_trace = format_nsh_node_map_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(nsh_md2_ioam_encap_transit_error_strings), + .error_strings = nsh_md2_ioam_encap_transit_error_strings, + + .n_next_nodes = NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_N_NEXT, + + .next_nodes = { + [NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_OUTPUT] = "interface-output", + [NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_DROP] = "error-drop", + }, + +}; +/* *INDENT-ON* */ + + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |