/* * node.c - - awkward chained buffer geometry test tool * * Copyright (c) 2019 by 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 <oddbuf/oddbuf.h> typedef struct { u32 sw_if_index; u32 next_index; u16 udp_checksum; } oddbuf_trace_t; #ifndef CLIB_MARCH_VARIANT /* packet trace format function */ static u8 * format_oddbuf_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 *); oddbuf_trace_t *t = va_arg (*args, oddbuf_trace_t *); s = format (s, "ODDBUF: sw_if_index %d, next index %d, udp checksum %04x\n", t->sw_if_index, t->next_index, (u32) t->udp_checksum); return s; } vlib_node_registration_t oddbuf_node; #endif /* CLIB_MARCH_VARIANT */ #define foreach_oddbuf_error \ _(SWAPPED, "Mac swap packets processed") typedef enum { #define _(sym,str) ODDBUF_ERROR_##sym, foreach_oddbuf_error #undef _ ODDBUF_N_ERROR, } oddbuf_error_t; #ifndef CLIB_MARCH_VARIANT static char *oddbuf_error_strings[] = { #define _(sym,string) string, foreach_oddbuf_error #undef _ }; #endif /* CLIB_MARCH_VARIANT */ typedef enum { ODDBUF_NEXT_DROP, ODDBUF_N_NEXT, } oddbuf_next_t; always_inline uword oddbuf_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, int is_ip4, int is_trace) { oddbuf_main_t *om = &oddbuf_main; u32 n_left_from, *from; vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; vlib_buffer_t *b0, *b0next; u32 bi; u16 nexts[VLIB_FRAME_SIZE], *next; u16 save_current_length; u32 next0; u8 *src, *dst; int i; ethernet_header_t *eh; ip4_header_t *ip; udp_header_t *udp; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; vlib_get_buffers (vm, from, bufs, n_left_from); b = bufs; next = nexts; while (n_left_from > 0) { b0 = b[0]; vnet_feature_next (&next0, b0); nexts[0] = next0; if (vlib_buffer_alloc (vm, &bi, 1) != 1) { clib_warning ("Buffer alloc fail, skipping"); goto skip; } if (om->first_chunk_offset) { memmove (b0->data + b0->current_data + om->first_chunk_offset, b0->data + b0->current_data, b0->current_length); b0->current_data += om->first_chunk_offset; } eh = vlib_buffer_get_current (b0); ip = (ip4_header_t *) (eh + 1); udp = (udp_header_t *) (ip4_next_header (ip)); if (1) { save_current_length = vlib_buffer_length_in_chain (vm, b0); b0next = vlib_get_buffer (vm, bi); b0->flags |= VLIB_BUFFER_NEXT_PRESENT; b0->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID; b0->next_buffer = bi; src = b0->data + b0->current_data + b0->current_length - om->n_to_copy; b0next->current_data = om->second_chunk_offset; b0next->current_length = om->n_to_copy; dst = b0next->data + b0next->current_data; for (i = 0; i < om->n_to_copy; i++) dst[i] = src[i]; b0->current_length -= om->n_to_copy; b0next->current_length = om->n_to_copy; if (vlib_buffer_length_in_chain (vm, b0) != save_current_length) clib_warning ("OOPS, length incorrect after chunk split..."); } udp->checksum = 0; udp->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ip); if (is_trace) { if (b[0]->flags & VLIB_BUFFER_IS_TRACED) { oddbuf_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t)); t->next_index = next[0]; t->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX]; t->udp_checksum = clib_net_to_host_u16 (udp->checksum); } } skip: b += 1; next += 1; n_left_from -= 1; } vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); return frame->n_vectors; } VLIB_NODE_FN (oddbuf_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) return oddbuf_inline (vm, node, frame, 1 /* is_ip4 */ , 1 /* is_trace */ ); else return oddbuf_inline (vm, node, frame, 1 /* is_ip4 */ , 0 /* is_trace */ ); } /* *INDENT-OFF* */ #ifndef CLIB_MARCH_VARIANT VLIB_REGISTER_NODE (oddbuf_node) = { .name = "oddbuf", .vector_size = sizeof (u32), .format_trace = format_oddbuf_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(oddbuf_error_strings), .error_strings = oddbuf_error_strings, .n_next_nodes = ODDBUF_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [ODDBUF_NEXT_DROP] = "error-drop", }, }; #endif /* CLIB_MARCH_VARIANT */ /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */