diff options
Diffstat (limited to 'plugins/flowperpkt-plugin/flowperpkt/l2_node.c')
| -rw-r--r-- | plugins/flowperpkt-plugin/flowperpkt/l2_node.c | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/plugins/flowperpkt-plugin/flowperpkt/l2_node.c b/plugins/flowperpkt-plugin/flowperpkt/l2_node.c new file mode 100644 index 00000000000..ba87d431b88 --- /dev/null +++ b/plugins/flowperpkt-plugin/flowperpkt/l2_node.c @@ -0,0 +1,544 @@ +/* + * l2_node.c - l2 ipfix-per-packet graph node + * + * Copyright (c) <current-year> <your-organization> + * 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 <flowperpkt/flowperpkt.h> + +/** + * @file l2 flow record generator graph node + */ + +typedef struct +{ + /** interface handle */ + u32 rx_sw_if_index; + u32 tx_sw_if_index; + /** src and dst L2 addresses */ + u8 src_mac[6]; + u8 dst_mac[6]; + /** Ethertype */ + u16 ethertype; + /** packet timestamp */ + u64 timestamp; + /** size of the buffer */ + u16 buffer_size; +} flowperpkt_l2_trace_t; + +/* packet trace format function */ +static u8 * +format_flowperpkt_l2_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 *); + flowperpkt_l2_trace_t *t = va_arg (*args, flowperpkt_l2_trace_t *); + + s = format (s, + "FLOWPERPKT-L2: rx_sw_if_index %d, tx_sw_if_index %d, src %U dst %U ethertype %0x2, timestamp %lld, size %d", + t->rx_sw_if_index, t->tx_sw_if_index, + format_ethernet_address, &t->src_mac, + format_ethernet_address, &t->dst_mac, + t->ethertype, t->timestamp, t->buffer_size); + return s; +} + +vlib_node_registration_t flowperpkt_l2_node; + +/* No counters at the moment */ +#define foreach_flowperpkt_l2_error + +typedef enum +{ +#define _(sym,str) FLOWPERPKT_ERROR_##sym, + foreach_flowperpkt_l2_error +#undef _ + FLOWPERPKT_N_ERROR, +} flowperpkt_l2_error_t; + +static char *flowperpkt_l2_error_strings[] = { +#define _(sym,string) string, + foreach_flowperpkt_l2_error +#undef _ +}; + +typedef enum +{ + FLOWPERPKT_L2_NEXT_DROP, + FLOWPERPKT_L2_N_NEXT, +} flowperpkt_l2_next_t; + +/** + * @brief add an entry to the flow record under construction + * @param vm vlib_main_t * current worker thread main structure pointer + * @param fm flowperpkt_main_t * flow-per-packet main structure pointer + * @param sw_if_index u32 interface handle + * @param tos u8 ToS bits from the packet + * @param timestamp u64 timestamp, nanoseconds since 1/1/70 + * @param length u16 ip length of the packet + * @param do_flush int 1 = flush all cached records, 0 = construct a record + */ + +static inline void +add_to_flow_record_l2 (vlib_main_t * vm, + flowperpkt_main_t * fm, + u32 rx_sw_if_index, u32 tx_sw_if_index, + u8 * src_mac, u8 * dst_mac, + u16 ethertype, u64 timestamp, u16 length, int do_flush) +{ + u32 my_cpu_number = vm->cpu_index; + flow_report_main_t *frm = &flow_report_main; + ip4_header_t *ip; + udp_header_t *udp; + ip4_ipfix_template_packet_t *tp; + ipfix_message_header_t *h; + ipfix_set_header_t *s; + vlib_frame_t *f; + vlib_buffer_t *b0; + u16 offset; + u32 bi0; + vlib_buffer_free_list_t *fl; + + /* Find or allocate a buffer */ + b0 = fm->l2_buffers_per_worker[my_cpu_number]; + + /* Need to allocate a buffer? */ + if (PREDICT_FALSE (b0 == 0)) + { + /* Nothing to flush */ + if (do_flush) + return; + + /* $$$$ drop counter? */ + if (vlib_buffer_alloc (vm, &bi0, 1) != 1) + return; + + /* Initialize the buffer */ + b0 = fm->l2_buffers_per_worker[my_cpu_number] = + vlib_get_buffer (vm, bi0); + fl = + vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); + vlib_buffer_init_for_free_list (b0, fl); + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0); + offset = 0; + } + else + { + /* use the current buffer */ + bi0 = vlib_get_buffer_index (vm, b0); + offset = fm->l2_next_record_offset_per_worker[my_cpu_number]; + } + + /* Find or allocate a frame */ + f = fm->l2_frames_per_worker[my_cpu_number]; + if (PREDICT_FALSE (f == 0)) + { + u32 *to_next; + f = vlib_get_frame_to_node (vm, ip4_lookup_node.index); + fm->l2_frames_per_worker[my_cpu_number] = f; + + /* Enqueue the buffer */ + to_next = vlib_frame_vector_args (f); + to_next[0] = bi0; + f->n_vectors = 1; + } + + /* Fresh packet, construct header */ + if (PREDICT_FALSE (offset == 0)) + { + flow_report_stream_t *stream; + + stream = &frm->streams[0]; + + b0->current_data = 0; + b0->current_length = sizeof (*ip) + sizeof (*udp) + sizeof (*h) + + sizeof (*s); + b0->flags |= (VLIB_BUFFER_TOTAL_LENGTH_VALID | VLIB_BUFFER_FLOW_REPORT); + vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = frm->fib_index; + + tp = vlib_buffer_get_current (b0); + ip = (ip4_header_t *) & tp->ip4; + udp = (udp_header_t *) (ip + 1); + h = (ipfix_message_header_t *) (udp + 1); + s = (ipfix_set_header_t *) (h + 1); + + ip->ip_version_and_header_length = 0x45; + ip->ttl = 254; + ip->protocol = IP_PROTOCOL_UDP; + ip->flags_and_fragment_offset = 0; + ip->src_address.as_u32 = frm->src_address.as_u32; + ip->dst_address.as_u32 = frm->ipfix_collector.as_u32; + udp->src_port = clib_host_to_net_u16 (UDP_DST_PORT_ipfix); + udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_ipfix); + udp->checksum = 0; + + /* FIXUP: message header export_time */ + h->export_time = (u32) + (((f64) frm->unix_time_0) + + (vlib_time_now (frm->vlib_main) - frm->vlib_time_0)); + h->export_time = clib_host_to_net_u32 (h->export_time); + h->domain_id = clib_host_to_net_u32 (stream->domain_id); + + /* FIXUP: message header sequence_number */ + h->sequence_number = stream->sequence_number++; + h->sequence_number = clib_host_to_net_u32 (h->sequence_number); + + offset = (u32) (((u8 *) (s + 1)) - (u8 *) tp); + } + + /* Add data, unless we're flushing stale data */ + if (PREDICT_TRUE (do_flush == 0)) + { + + /* Add data */ + /* Ingress interface */ + { + u32 ingress_interface = clib_host_to_net_u32 (rx_sw_if_index); + clib_memcpy (b0->data + offset, &ingress_interface, + sizeof (ingress_interface)); + offset += sizeof (ingress_interface); + } + /* Egress interface */ + { + u32 egress_interface = clib_host_to_net_u32 (tx_sw_if_index); + clib_memcpy (b0->data + offset, &egress_interface, + sizeof (egress_interface)); + offset += sizeof (egress_interface); + } + /* src mac address */ + { + clib_memcpy (b0->data + offset, src_mac, 6); + offset += 6; + } + /* dst mac address */ + { + clib_memcpy (b0->data + offset, dst_mac, 6); + offset += 6; + } + + /* ethertype */ + b0->data[offset++] = ethertype >> 8; + b0->data[offset++] = ethertype & 0xFF; + + /* Timestamp */ + clib_memcpy (b0->data + offset, ×tamp, sizeof (f64)); + offset += sizeof (f64); + + /* pkt size */ + { + u16 pkt_size = clib_host_to_net_u16 (length); + clib_memcpy (b0->data + offset, &pkt_size, sizeof (pkt_size)); + offset += sizeof (pkt_size); + } + + b0->current_length += + /* 2*sw_if_index + 2*mac + ethertype + timestamp + length = 32 */ + 2 * sizeof (u32) + 12 + sizeof (u16) + sizeof (f64) + sizeof (u16); + + } + /* Time to flush the buffer? */ + if (PREDICT_FALSE + (do_flush || (offset + 2 * sizeof (u32) + 12 + sizeof (u16) + + +sizeof (f64) + sizeof (u16)) > frm->path_mtu)) + { + tp = vlib_buffer_get_current (b0); + ip = (ip4_header_t *) & tp->ip4; + udp = (udp_header_t *) (ip + 1); + h = (ipfix_message_header_t *) (udp + 1); + s = (ipfix_set_header_t *) (h + 1); + + s->set_id_length = ipfix_set_id_length (fm->l2_report_id, + b0->current_length - + (sizeof (*ip) + sizeof (*udp) + + sizeof (*h))); + h->version_length = version_length (b0->current_length - + (sizeof (*ip) + sizeof (*udp))); + + ip->length = clib_host_to_net_u16 (b0->current_length); + + ip->checksum = ip4_header_checksum (ip); + udp->length = clib_host_to_net_u16 (b0->current_length - sizeof (*ip)); + + if (frm->udp_checksum) + { + /* RFC 7011 section 10.3.2. */ + udp->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ip); + if (udp->checksum == 0) + udp->checksum = 0xffff; + } + + ASSERT (ip->checksum == ip4_header_checksum (ip)); + + vlib_put_frame_to_node (vm, ip4_lookup_node.index, + fm->l2_frames_per_worker[my_cpu_number]); + fm->l2_frames_per_worker[my_cpu_number] = 0; + fm->l2_buffers_per_worker[my_cpu_number] = 0; + offset = 0; + } + + fm->l2_next_record_offset_per_worker[my_cpu_number] = offset; +} + +void +flowperpkt_flush_callback_l2 (void) +{ + vlib_main_t *vm = vlib_get_main (); + flowperpkt_main_t *fm = &flowperpkt_main; + + add_to_flow_record_l2 (vm, fm, 0 /* rx_sw_if_index */ , + 0 /* tx_sw_if_index */ , + 0 /* src mac */ , + 0 /* dst mac */ , + 0 /* ethertype */ , + 0ULL /* timestamp */ , + 0 /* length */ , + 1 /* do_flush */ ); +} + + +static uword +flowperpkt_l2_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * frame) +{ + u32 n_left_from, *from, *to_next; + flowperpkt_l2_next_t next_index; + flowperpkt_main_t *fm = &flowperpkt_main; + u64 now; + + now = (u64) ((vlib_time_now (vm) - fm->vlib_time_0) * 1e9); + now += fm->nanosecond_time_0; + + from = vlib_frame_vector_args (frame); + n_left_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 next0 = FLOWPERPKT_L2_NEXT_DROP; + u32 next1 = FLOWPERPKT_L2_NEXT_DROP; + ethernet_header_t *eh0, *eh1; + u16 len0, len1; + u32 bi0, bi1; + vlib_buffer_t *b0, *b1; + + /* 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, CLIB_CACHE_LINE_BYTES, STORE); + CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE); + } + + /* speculatively enqueue b0 and b1 to the current next frame */ + to_next[0] = bi0 = from[0]; + to_next[1] = bi1 = from[1]; + from += 2; + to_next += 2; + n_left_from -= 2; + n_left_to_next -= 2; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + + vnet_feature_next (vnet_buffer (b0)->sw_if_index[VLIB_TX], + &next0, b0); + vnet_feature_next (vnet_buffer (b1)->sw_if_index[VLIB_TX], + &next1, b1); + + eh0 = vlib_buffer_get_current (b0); + len0 = vlib_buffer_length_in_chain (vm, b0); + + if (PREDICT_TRUE ((b0->flags & VLIB_BUFFER_FLOW_REPORT) == 0)) + add_to_flow_record_l2 (vm, fm, + vnet_buffer (b0)->sw_if_index[VLIB_RX], + vnet_buffer (b0)->sw_if_index[VLIB_TX], + eh0->src_address, + eh0->dst_address, + eh0->type, now, len0, 0 /* flush */ ); + + eh1 = vlib_buffer_get_current (b0); + len1 = vlib_buffer_length_in_chain (vm, b0); + + if (PREDICT_TRUE ((b1->flags & VLIB_BUFFER_FLOW_REPORT) == 0)) + add_to_flow_record_l2 (vm, fm, + vnet_buffer (b1)->sw_if_index[VLIB_RX], + vnet_buffer (b1)->sw_if_index[VLIB_TX], + eh1->src_address, + eh1->dst_address, + eh1->type, now, len1, 0 /* flush */ ); + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) + { + if (b0->flags & VLIB_BUFFER_IS_TRACED) + { + flowperpkt_l2_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->rx_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + t->tx_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX]; + clib_memcpy (t->src_mac, eh0->src_address, 6); + clib_memcpy (t->dst_mac, eh0->dst_address, 6); + t->ethertype = clib_net_to_host_u16 (eh0->type); + t->timestamp = now; + t->buffer_size = len0; + } + if (b1->flags & VLIB_BUFFER_IS_TRACED) + { + flowperpkt_l2_trace_t *t = + vlib_add_trace (vm, node, b1, sizeof (*t)); + t->rx_sw_if_index = vnet_buffer (b1)->sw_if_index[VLIB_RX]; + t->tx_sw_if_index = vnet_buffer (b1)->sw_if_index[VLIB_TX]; + clib_memcpy (t->src_mac, eh1->src_address, 6); + clib_memcpy (t->dst_mac, eh1->dst_address, 6); + t->ethertype = clib_net_to_host_u16 (eh1->type); + t->timestamp = now; + t->buffer_size = len1; + } + } + + /* verify speculative enqueues, maybe switch current next frame */ + 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 = FLOWPERPKT_L2_NEXT_DROP; + ethernet_header_t *eh0; + u16 len0; + + /* speculatively enqueue b0 to the current next frame */ + 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); + + vnet_feature_next (vnet_buffer (b0)->sw_if_index[VLIB_TX], + &next0, b0); + + eh0 = vlib_buffer_get_current (b0); + len0 = vlib_buffer_length_in_chain (vm, b0); + + if (PREDICT_TRUE ((b0->flags & VLIB_BUFFER_FLOW_REPORT) == 0)) + add_to_flow_record_l2 (vm, fm, + vnet_buffer (b0)->sw_if_index[VLIB_RX], + vnet_buffer (b0)->sw_if_index[VLIB_TX], + eh0->src_address, + eh0->dst_address, + eh0->type, now, len0, 0 /* flush */ ); + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + flowperpkt_l2_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->rx_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + t->tx_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX]; + clib_memcpy (t->src_mac, eh0->src_address, 6); + clib_memcpy (t->dst_mac, eh0->dst_address, 6); + t->ethertype = clib_net_to_host_u16 (eh0->type); + t->timestamp = now; + t->buffer_size = len0; + } + + /* verify speculative enqueue, maybe switch current next frame */ + 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 frame->n_vectors; +} + +/** + * @brief IPFIX l2 flow-per-packet graph node + * @node flowperpkt-l2 + * + * This is the IPFIX flow-record-per-packet node. + * + * @param vm vlib_main_t corresponding to the current thread. + * @param node vlib_node_runtime_t data for this node. + * @param frame vlib_frame_t whose contents should be dispatched. + * + * @par Graph mechanics: buffer metadata, next index usage + * + * <em>Uses:</em> + * - <code>vnet_buffer(b)->ip.save_rewrite_length</code> + * - tells the node the length of the rewrite which was applied in + * ip4/6_rewrite_inline, allows the code to find the IP header without + * having to parse L2 headers, or make stupid assumptions about their + * length. + * - <code>vnet_buffer(b)->flags & VLIB_BUFFER_FLOW_REPORT</code> + * - Used to suppress flow record generation for flow record packets. + * + * <em>Sets:</em> + * - <code>vnet_buffer(b)->flags & VLIB_BUFFER_FLOW_REPORT</code> + * - To suppress flow record generation for flow record packets + * + * <em>Next Index:</em> + * - Next configured output feature on the interface, usually + * "interface-output." Generated flow records head for ip4-lookup + */ + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (flowperpkt_l2_node) = { + .function = flowperpkt_l2_node_fn, + .name = "flowperpkt-l2", + .vector_size = sizeof (u32), + .format_trace = format_flowperpkt_l2_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(flowperpkt_l2_error_strings), + .error_strings = flowperpkt_l2_error_strings, + + .n_next_nodes = FLOWPERPKT_L2_N_NEXT, + + /* edit / add dispositions here */ + .next_nodes = { + [FLOWPERPKT_L2_NEXT_DROP] = "error-drop", + }, +}; +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |