--- /dev/null
+/*
+ * 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.
+ */
+/*
+ * ip/ip4_forward.c: IP v4 forwarding
+ *
+ * Copyright (c) 2008 Eliot Dresselhaus
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <vnet/ip-neighbor/ip4_neighbor.h>
+#include <vnet/ethernet/ethernet.h>
+
+void
+ip4_neighbor_probe_dst (const ip_adjacency_t * adj, const ip4_address_t * dst)
+{
+ ip_interface_address_t *ia;
+ ip4_address_t *src;
+
+ src = ip4_interface_address_matching_destination
+ (&ip4_main,
+ &adj->sub_type.nbr.next_hop.ip4, adj->rewrite_header.sw_if_index, &ia);
+ if (!src)
+ return;
+
+ ip4_neighbor_probe (vlib_get_main (), vnet_get_main (), adj, src, dst);
+}
+
+void
+ip4_neighbor_advertise (vlib_main_t * vm,
+ vnet_main_t * vnm,
+ u32 sw_if_index, const ip4_address_t * addr)
+{
+ vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
+ ip4_main_t *i4m = &ip4_main;
+ u8 *rewrite, rewrite_len;
+
+ if (NULL == addr)
+ {
+ ip4_main_t *i4m = &ip4_main;
+ addr = ip4_interface_first_address (i4m, sw_if_index, 0);
+ }
+
+ if (addr)
+ {
+ clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d",
+ format_ip4_address, addr, sw_if_index);
+
+ /* Form GARP packet for output - Gratuitous ARP is an ARP request packet
+ where the interface IP/MAC pair is used for both source and request
+ MAC/IP pairs in the request */
+ u32 bi = 0;
+ ethernet_arp_header_t *h = vlib_packet_template_get_packet
+ (vm, &i4m->ip4_arp_request_packet_template, &bi);
+
+ if (!h)
+ return;
+
+ mac_address_from_bytes (&h->ip4_over_ethernet[0].mac, hi->hw_address);
+ mac_address_from_bytes (&h->ip4_over_ethernet[1].mac, hi->hw_address);
+ h->ip4_over_ethernet[0].ip4 = addr[0];
+ h->ip4_over_ethernet[1].ip4 = addr[0];
+
+ /* Setup MAC header with ARP Etype and broadcast DMAC */
+ vlib_buffer_t *b = vlib_get_buffer (vm, bi);
+ rewrite =
+ ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_ARP,
+ VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST);
+ rewrite_len = vec_len (rewrite);
+ vlib_buffer_advance (b, -rewrite_len);
+ ethernet_header_t *e = vlib_buffer_get_current (b);
+ clib_memcpy_fast (e->dst_address, rewrite, rewrite_len);
+ vec_free (rewrite);
+
+ /* Send GARP packet out the specified interface */
+ vnet_buffer (b)->sw_if_index[VLIB_RX] =
+ vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
+ vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
+ u32 *to_next = vlib_frame_vector_args (f);
+ to_next[0] = bi;
+ f->n_vectors = 1;
+ vlib_put_frame_to_node (vm, hi->output_node_index, f);
+ }
+}
+
+always_inline uword
+ip4_arp_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame, int is_glean)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ ip4_main_t *im = &ip4_main;
+ ip_lookup_main_t *lm = &im->lookup_main;
+ u32 *from, *to_next_drop;
+ uword n_left_from, n_left_to_next_drop, next_index;
+ u32 thread_index = vm->thread_index;
+ u64 seed;
+
+ if (node->flags & VLIB_NODE_FLAG_TRACE)
+ ip4_forward_next_trace (vm, node, frame, VLIB_TX);
+
+ seed = throttle_seed (&im->arp_throttle, thread_index, vlib_time_now (vm));
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+ if (next_index == IP4_ARP_NEXT_DROP)
+ next_index = IP4_ARP_N_NEXT; /* point to first interface */
+
+ while (n_left_from > 0)
+ {
+ vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
+ to_next_drop, n_left_to_next_drop);
+
+ while (n_left_from > 0 && n_left_to_next_drop > 0)
+ {
+ u32 pi0, adj_index0, sw_if_index0;
+ ip4_address_t resolve0, src0;
+ vlib_buffer_t *p0, *b0;
+ ip_adjacency_t *adj0;
+ u64 r0;
+
+ pi0 = from[0];
+ p0 = vlib_get_buffer (vm, pi0);
+
+ from += 1;
+ n_left_from -= 1;
+ to_next_drop[0] = pi0;
+ to_next_drop += 1;
+ n_left_to_next_drop -= 1;
+
+ adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
+ adj0 = adj_get (adj_index0);
+ sw_if_index0 = adj0->rewrite_header.sw_if_index;
+
+ if (is_glean)
+ {
+ /* resolve the packet's destination */
+ ip4_header_t *ip0 = vlib_buffer_get_current (p0);
+ resolve0 = ip0->dst_address;
+ src0 = adj0->sub_type.glean.receive_addr.ip4;
+ }
+ else
+ {
+ /* resolve the incomplete adj */
+ resolve0 = adj0->sub_type.nbr.next_hop.ip4;
+ /* Src IP address in ARP header. */
+ if (ip4_src_address_for_packet (lm, sw_if_index0, &src0))
+ {
+ /* No source address available */
+ p0->error = node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
+ continue;
+ }
+ }
+
+ /* combine the address and interface for the hash key */
+ r0 = (u64) resolve0.data_u32 << 32;
+ r0 |= sw_if_index0;
+
+ if (throttle_check (&im->arp_throttle, thread_index, r0, seed))
+ {
+ p0->error = node->errors[IP4_ARP_ERROR_THROTTLED];
+ continue;
+ }
+
+ /*
+ * the adj has been updated to a rewrite but the node the DPO that got
+ * us here hasn't - yet. no big deal. we'll drop while we wait.
+ */
+ if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
+ {
+ p0->error = node->errors[IP4_ARP_ERROR_RESOLVED];
+ continue;
+ }
+
+ /*
+ * Can happen if the control-plane is programming tables
+ * with traffic flowing; at least that's today's lame excuse.
+ */
+ if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
+ || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
+ {
+ p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
+ continue;
+ }
+
+ /* Send ARP request. */
+ b0 = ip4_neighbor_probe (vm, vnm, adj0, &src0, &resolve0);
+
+ if (PREDICT_TRUE (NULL != b0))
+ {
+ /* copy the persistent fields from the original */
+ clib_memcpy_fast (b0->opaque2, p0->opaque2,
+ sizeof (p0->opaque2));
+ p0->error = node->errors[IP4_ARP_ERROR_REQUEST_SENT];
+ }
+ else
+ {
+ p0->error = node->errors[IP4_ARP_ERROR_NO_BUFFERS];
+ continue;
+ }
+ }
+
+ vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
+ }
+
+ return frame->n_vectors;
+}
+
+VLIB_NODE_FN (ip4_arp_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (ip4_arp_inline (vm, node, frame, 0));
+}
+
+VLIB_NODE_FN (ip4_glean_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (ip4_arp_inline (vm, node, frame, 1));
+}
+
+static char *ip4_arp_error_strings[] = {
+ [IP4_ARP_ERROR_THROTTLED] = "ARP requests throttled",
+ [IP4_ARP_ERROR_RESOLVED] = "ARP requests resolved",
+ [IP4_ARP_ERROR_NO_BUFFERS] = "ARP requests out of buffer",
+ [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
+ [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
+ [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
+};
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_arp_node) =
+{
+ .name = "ip4-arp",
+ .vector_size = sizeof (u32),
+ .format_trace = format_ip4_forward_next_trace,
+ .n_errors = ARRAY_LEN (ip4_arp_error_strings),
+ .error_strings = ip4_arp_error_strings,
+ .n_next_nodes = IP4_ARP_N_NEXT,
+ .next_nodes = {
+ [IP4_ARP_NEXT_DROP] = "ip4-drop",
+ },
+};
+
+VLIB_REGISTER_NODE (ip4_glean_node) =
+{
+ .name = "ip4-glean",
+ .vector_size = sizeof (u32),
+ .format_trace = format_ip4_forward_next_trace,
+ .n_errors = ARRAY_LEN (ip4_arp_error_strings),
+ .error_strings = ip4_arp_error_strings,
+ .n_next_nodes = IP4_ARP_N_NEXT,
+ .next_nodes = {
+ [IP4_ARP_NEXT_DROP] = "ip4-drop",
+ },
+};
+/* *INDENT-ON* */
+
+#define foreach_notrace_ip4_arp_error \
+_(THROTTLED) \
+_(RESOLVED) \
+_(NO_BUFFERS) \
+_(REQUEST_SENT) \
+_(NON_ARP_ADJ) \
+_(NO_SOURCE_ADDRESS)
+
+static clib_error_t *
+arp_notrace_init (vlib_main_t * vm)
+{
+ vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
+
+ /* don't trace ARP request packets */
+#define _(a) \
+ vnet_pcap_drop_trace_filter_add_del \
+ (rt->errors[IP4_ARP_ERROR_##a], \
+ 1 /* is_add */);
+ foreach_notrace_ip4_arp_error;
+#undef _
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (arp_notrace_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
Code Review / vpp.git / blobdiff