+++ /dev/null
-/*
- * DHCP feature; applied as an input feature to select DHCP packets
- *
- * Copyright (c) 2013 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 <vnet/dhcp/client.h>
-#include <vnet/udp/udp.h>
-
-#define foreach_dhcp_client_detect \
- _(EXTRACT, "Extract")
-
-typedef enum
-{
-#define _(sym,str) DHCP_CLIENT_DETECT_ERROR_##sym,
- foreach_dhcp_client_detect
-#undef _
- DHCP_CLIENT_DETECT_N_ERROR,
-} dhcp_client_detect_error_t;
-
-static char *dhcp_client_detect_error_strings[] = {
-#define _(sym,string) string,
- foreach_dhcp_client_detect
-#undef _
-};
-
-typedef enum
-{
-#define _(sym,str) DHCP_CLIENT_DETECT_NEXT_##sym,
- foreach_dhcp_client_detect
-#undef _
- DHCP_CLIENT_DETECT_N_NEXT,
-} dhcp_client_detect_next_t;
-
-/**
- * per-packet trace data
- */
-typedef struct dhcp_client_detect_trace_t_
-{
- /* per-pkt trace data */
- u8 extracted;
-} dhcp_client_detect_trace_t;
-
-VLIB_NODE_FN (dhcp_client_detect_node) (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- dhcp_client_detect_next_t next_index;
- u16 dhcp_client_port_network_order;
- u32 n_left_from, *from, *to_next;
- u32 extractions;
-
- dhcp_client_port_network_order =
- clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_client);
- next_index = 0;
- extractions = 0;
- n_left_from = frame->n_vectors;
- from = vlib_frame_vector_args (frame);
-
- while (n_left_from > 0)
- {
- u32 n_left_to_next;
-
- vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
-
- /*
- * This loop is optimised not so we can really quickly process DHCp
- * offers... but so we can quickly sift them out when the interface
- * is also receiving 'normal' packets
- */
- while (n_left_from >= 8 && n_left_to_next >= 4)
- {
- udp_header_t *udp0, *udp1, *udp2, *udp3;
- ip4_header_t *ip0, *ip1, *ip2, *ip3;
- vlib_buffer_t *b0, *b1, *b2, *b3;
- u32 next0, next1, next2, next3;
- u32 bi0, bi1, bi2, bi3;
-
- next0 = next1 = next2 = next3 = ~0;
- bi0 = to_next[0] = from[0];
- bi1 = to_next[1] = from[1];
- bi2 = to_next[2] = from[2];
- bi3 = to_next[3] = from[3];
-
- /* Prefetch next iteration. */
- {
- vlib_buffer_t *p2, *p3, *p4, *p5;
-
- p2 = vlib_get_buffer (vm, from[2]);
- p3 = vlib_get_buffer (vm, from[3]);
- p4 = vlib_get_buffer (vm, from[4]);
- p5 = vlib_get_buffer (vm, from[5]);
-
- vlib_prefetch_buffer_header (p2, STORE);
- vlib_prefetch_buffer_header (p3, STORE);
- vlib_prefetch_buffer_header (p4, STORE);
- vlib_prefetch_buffer_header (p5, STORE);
-
- CLIB_PREFETCH (p2->data, sizeof (ip0[0]) + sizeof (udp0[0]),
- STORE);
- CLIB_PREFETCH (p3->data, sizeof (ip0[0]) + sizeof (udp0[0]),
- STORE);
- CLIB_PREFETCH (p4->data, sizeof (ip0[0]) + sizeof (udp0[0]),
- STORE);
- CLIB_PREFETCH (p5->data, sizeof (ip0[0]) + sizeof (udp0[0]),
- STORE);
- }
-
- from += 4;
- to_next += 4;
- n_left_from -= 4;
- n_left_to_next -= 4;
-
- b0 = vlib_get_buffer (vm, bi0);
- b1 = vlib_get_buffer (vm, bi1);
- b2 = vlib_get_buffer (vm, bi2);
- b3 = vlib_get_buffer (vm, bi3);
- ip0 = vlib_buffer_get_current (b0);
- ip1 = vlib_buffer_get_current (b1);
- ip2 = vlib_buffer_get_current (b2);
- ip3 = vlib_buffer_get_current (b2);
-
- vnet_feature_next (&next0, b0);
- vnet_feature_next (&next1, b1);
- vnet_feature_next (&next2, b2);
- vnet_feature_next (&next3, b3);
-
- if (ip0->protocol == IP_PROTOCOL_UDP)
- {
- udp0 = (udp_header_t *) (ip0 + 1);
-
- if (dhcp_client_port_network_order == udp0->dst_port)
- {
- next0 = DHCP_CLIENT_DETECT_NEXT_EXTRACT;
- extractions++;
- }
- }
- if (ip1->protocol == IP_PROTOCOL_UDP)
- {
- udp1 = (udp_header_t *) (ip1 + 1);
-
- if (dhcp_client_port_network_order == udp1->dst_port)
- {
- next1 = DHCP_CLIENT_DETECT_NEXT_EXTRACT;
- extractions++;
- }
- }
- if (ip2->protocol == IP_PROTOCOL_UDP)
- {
- udp2 = (udp_header_t *) (ip2 + 1);
-
- if (dhcp_client_port_network_order == udp2->dst_port)
- {
- next2 = DHCP_CLIENT_DETECT_NEXT_EXTRACT;
- extractions++;
- }
- }
- if (ip3->protocol == IP_PROTOCOL_UDP)
- {
- udp3 = (udp_header_t *) (ip3 + 1);
-
- if (dhcp_client_port_network_order == udp3->dst_port)
- {
- next3 = DHCP_CLIENT_DETECT_NEXT_EXTRACT;
- extractions++;
- }
- }
-
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- dhcp_client_detect_trace_t *t =
- vlib_add_trace (vm, node, b0, sizeof (*t));
- t->extracted = (next0 == DHCP_CLIENT_DETECT_NEXT_EXTRACT);
- }
- if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
- {
- dhcp_client_detect_trace_t *t =
- vlib_add_trace (vm, node, b1, sizeof (*t));
- t->extracted = (next1 == DHCP_CLIENT_DETECT_NEXT_EXTRACT);
- }
- if (PREDICT_FALSE (b2->flags & VLIB_BUFFER_IS_TRACED))
- {
- dhcp_client_detect_trace_t *t =
- vlib_add_trace (vm, node, b2, sizeof (*t));
- t->extracted = (next2 == DHCP_CLIENT_DETECT_NEXT_EXTRACT);
- }
- if (PREDICT_FALSE (b3->flags & VLIB_BUFFER_IS_TRACED))
- {
- dhcp_client_detect_trace_t *t =
- vlib_add_trace (vm, node, b3, sizeof (*t));
- t->extracted = (next3 == DHCP_CLIENT_DETECT_NEXT_EXTRACT);
- }
-
- /* verify speculative enqueue, maybe switch current next frame */
- vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
- to_next, n_left_to_next,
- bi0, bi1, bi2, bi3,
- next0, next1, next2, next3);
- }
-
- while (n_left_from > 0 && n_left_to_next > 0)
- {
- udp_header_t *udp0;
- vlib_buffer_t *b0;
- ip4_header_t *ip0;
- u32 next0 = ~0;
- u32 bi0;
-
- 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);
- ip0 = vlib_buffer_get_current (b0);
-
- /*
- * when this feature is applied on an interface that is already
- * accepting packets (because e.g. the interface has other addresses
- * assigned) we are looking for the preverbial needle in the haystack
- * so assume the packet is not the one we are looking for.
- */
- vnet_feature_next (&next0, b0);
-
- /*
- * all we are looking for here is DHCP/BOOTP packet-to-client
- * UDO port.
- */
- if (ip0->protocol == IP_PROTOCOL_UDP)
- {
- udp0 = (udp_header_t *) (ip0 + 1);
-
- if (dhcp_client_port_network_order == udp0->dst_port)
- {
- next0 = DHCP_CLIENT_DETECT_NEXT_EXTRACT;
- extractions++;
- }
- }
-
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- dhcp_client_detect_trace_t *t =
- vlib_add_trace (vm, node, b0, sizeof (*t));
- t->extracted = (next0 == DHCP_CLIENT_DETECT_NEXT_EXTRACT);
- }
-
- /* 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);
- }
-
- vlib_node_increment_counter (vm, node->node_index,
- DHCP_CLIENT_DETECT_ERROR_EXTRACT, extractions);
-
- return frame->n_vectors;
-}
-
-/* packet trace format function */
-static u8 *
-format_dhcp_client_detect_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 *);
- dhcp_client_detect_trace_t *t =
- va_arg (*args, dhcp_client_detect_trace_t *);
-
- s = format (s, "dhcp-client-detect: %s", (t->extracted ? "yes" : "no"));
-
- return s;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (dhcp_client_detect_node) = {
- .name = "ip4-dhcp-client-detect",
- .vector_size = sizeof (u32),
- .format_trace = format_dhcp_client_detect_trace,
- .type = VLIB_NODE_TYPE_INTERNAL,
-
- .n_errors = ARRAY_LEN(dhcp_client_detect_error_strings),
- .error_strings = dhcp_client_detect_error_strings,
-
- .n_next_nodes = DHCP_CLIENT_DETECT_N_NEXT,
- .next_nodes = {
- /*
- * Jump straight to the UDP dispatch node thus avoiding
- * the RPF checks in ip4-local that will fail
- */
- [DHCP_CLIENT_DETECT_NEXT_EXTRACT] = "ip4-udp-lookup",
- },
-};
-
-VNET_FEATURE_INIT (ip4_dvr_reinject_feat_node, static) =
-{
- .arc_name = "ip4-unicast",
- .node_name = "ip4-dhcp-client-detect",
- .runs_before = VNET_FEATURES ("ip4-not-enabled"),
-};
-
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */
Code Review / vpp.git / blobdiff