/* * 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 #include #include #include #include #include #include /* Statistics (not really errors) */ #define foreach_vxlan_gpe_pop_ioam_v4_error \ _(POPPED, "good packets popped") static char *vxlan_gpe_pop_ioam_v4_error_strings[] = { #define _(sym,string) string, foreach_vxlan_gpe_pop_ioam_v4_error #undef _ }; typedef enum { #define _(sym,str) VXLAN_GPE_POP_IOAM_V4_ERROR_##sym, foreach_vxlan_gpe_pop_ioam_v4_error #undef _ VXLAN_GPE_POP_IOAM_V4_N_ERROR, } vxlan_gpe_pop_ioam_v4_error_t; typedef struct { ioam_trace_t fmt_trace; } vxlan_gpe_pop_ioam_v4_trace_t; u8 * format_vxlan_gpe_pop_ioam_v4_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 *); vxlan_gpe_pop_ioam_v4_trace_t *t1 = va_arg (*args, vxlan_gpe_pop_ioam_v4_trace_t *); ioam_trace_t *t = &(t1->fmt_trace); vxlan_gpe_ioam_option_t *fmt_trace0; vxlan_gpe_ioam_option_t *opt0, *limit0; vxlan_gpe_ioam_main_t *hm = &vxlan_gpe_ioam_main; u8 type0; fmt_trace0 = (vxlan_gpe_ioam_option_t *) t->option_data; s = format (s, "VXLAN_GPE_IOAM_POP: next_index %d len %d traced %d", t->next_index, fmt_trace0->length, t->trace_len); opt0 = (vxlan_gpe_ioam_option_t *) (fmt_trace0 + 1); limit0 = (vxlan_gpe_ioam_option_t *) ((u8 *) fmt_trace0) + t->trace_len; while (opt0 < limit0) { type0 = opt0->type; switch (type0) { case 0: /* Pad, just stop */ opt0 = (vxlan_gpe_ioam_option_t *) ((u8 *) opt0) + 1; break; default: if (hm->trace[type0]) { s = (*hm->trace[type0]) (s, opt0); } else { s = format (s, "\n unrecognized option %d length %d", type0, opt0->length); } opt0 = (vxlan_gpe_ioam_option_t *) (((u8 *) opt0) + opt0->length + sizeof (vxlan_gpe_ioam_option_t)); break; } } return s; } always_inline void vxlan_gpe_ioam_pop_v4 (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_buffer_t * b0) { ip4_header_t *ip0; udp_header_t *udp_hdr0; vxlan_gpe_header_t *gpe_hdr0; vxlan_gpe_ioam_hdr_t *gpe_ioam0; ip0 = vlib_buffer_get_current (b0); udp_hdr0 = (udp_header_t *) (ip0 + 1); gpe_hdr0 = (vxlan_gpe_header_t *) (udp_hdr0 + 1); gpe_ioam0 = (vxlan_gpe_ioam_hdr_t *) (gpe_hdr0 + 1); /* Pop the iOAM data */ vlib_buffer_advance (b0, (word) (sizeof (udp_header_t) + sizeof (ip4_header_t) + sizeof (vxlan_gpe_header_t) + gpe_ioam0->length)); return; } always_inline void vxlan_gpe_pop_ioam_v4_one_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vxlan_gpe_main_t * ngm, vlib_buffer_t * b0, u32 * next0) { CLIB_UNUSED (ip4_header_t * ip0); CLIB_UNUSED (udp_header_t * udp_hdr0); CLIB_UNUSED (vxlan_gpe_header_t * gpe_hdr0); CLIB_UNUSED (vxlan_gpe_ioam_hdr_t * gpe_ioam0); CLIB_UNUSED (vxlan_gpe_ioam_option_t * opt0); CLIB_UNUSED (vxlan_gpe_ioam_option_t * limit0); vxlan_gpe_ioam_main_t *hm = &vxlan_gpe_ioam_main; /* Pop the iOAM header */ ip0 = vlib_buffer_get_current (b0); udp_hdr0 = (udp_header_t *) (ip0 + 1); gpe_hdr0 = (vxlan_gpe_header_t *) (udp_hdr0 + 1); gpe_ioam0 = (vxlan_gpe_ioam_hdr_t *) (gpe_hdr0 + 1); opt0 = (vxlan_gpe_ioam_option_t *) (gpe_ioam0 + 1); limit0 = (vxlan_gpe_ioam_option_t *) ((u8 *) gpe_ioam0 + gpe_ioam0->length); /* * Basic validity checks */ if (gpe_ioam0->length > clib_net_to_host_u16 (ip0->length)) { *next0 = VXLAN_GPE_INPUT_NEXT_DROP; goto trace00; } /* Scan the set of h-b-h options, process ones that we understand */ while (opt0 < limit0) { u8 type0; type0 = opt0->type; switch (type0) { case 0: /* Pad1 */ opt0 = (vxlan_gpe_ioam_option_t *) ((u8 *) opt0) + 1; continue; case 1: /* PadN */ break; default: if (hm->pop_options[type0]) { if ((*hm->pop_options[type0]) (ip0, opt0) < 0) { *next0 = VXLAN_GPE_INPUT_NEXT_DROP; goto trace00; } } break; } opt0 = (vxlan_gpe_ioam_option_t *) (((u8 *) opt0) + opt0->length + sizeof (vxlan_gpe_ioam_hdr_t)); } *next0 = (gpe_ioam0->protocol < VXLAN_GPE_PROTOCOL_MAX) ? ngm-> decap_next_node_list[gpe_ioam0->protocol] : VXLAN_GPE_INPUT_NEXT_DROP; trace00: if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { vxlan_gpe_pop_ioam_v4_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); u32 trace_len = gpe_ioam0->length; t->fmt_trace.next_index = *next0; /* Capture the h-b-h option verbatim */ trace_len = trace_len < ARRAY_LEN (t->fmt_trace. option_data) ? trace_len : ARRAY_LEN (t->fmt_trace. option_data); t->fmt_trace.trace_len = trace_len; clib_memcpy_fast (&(t->fmt_trace.option_data), gpe_ioam0, trace_len); } /* Remove the iOAM header inside the VxLAN-GPE header */ vxlan_gpe_ioam_pop_v4 (vm, node, b0); return; } always_inline void vxlan_gpe_pop_ioam_v4_two_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vxlan_gpe_main_t * ngm, vlib_buffer_t * b0, vlib_buffer_t * b1, u32 * next0, u32 * next1) { vxlan_gpe_pop_ioam_v4_one_inline (vm, node, ngm, b0, next0); vxlan_gpe_pop_ioam_v4_one_inline (vm, node, ngm, b1, next1); } static uword vxlan_gpe_pop_ioam (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, u8 is_ipv6) { u32 n_left_from, next_index, *from, *to_next; vxlan_gpe_main_t *ngm = &vxlan_gpe_main; 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 >= 4 && n_left_to_next >= 2) { u32 bi0, bi1; vlib_buffer_t *b0, *b1; u32 next0, next1; /* Prefetch next iteration. */ { vlib_buffer_t *p2, *p3; p2 = vlib_get_buffer (vm, from[2]); p3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); } bi0 = from[0]; bi1 = from[1]; to_next[0] = bi0; to_next[1] = bi1; from += 2; to_next += 2; n_left_to_next -= 2; n_left_from -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); vxlan_gpe_pop_ioam_v4_two_inline (vm, node, ngm, b0, b1, &next0, &next1); vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t *b0; u32 next0; 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); vxlan_gpe_pop_ioam_v4_one_inline (vm, node, ngm, b0, &next0); 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; } static uword vxlan_gpe_pop_ioam_v4 (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { return vxlan_gpe_pop_ioam (vm, node, from_frame, 0); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (vxlan_gpe_pop_ioam_v4_node) = { .function = vxlan_gpe_pop_ioam_v4, .name = "vxlan-gpe-pop-ioam-v4", .vector_size = sizeof (u32), .format_trace = format_vxlan_gpe_pop_ioam_v4_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(vxlan_gpe_pop_ioam_v4_error_strings), .error_strings = vxlan_gpe_pop_ioam_v4_error_strings, .n_next_nodes = VXLAN_GPE_INPUT_N_NEXT, .next_nodes = { #define _(s,n) [VXLAN_GPE_INPUT_NEXT_##s] = n, foreach_vxlan_gpe_input_next #undef _ }, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */