};
/* *INDENT-ON* */
-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, bi0, adj_index0, sw_if_index0;
- ip_adjacency_t *adj0;
- vlib_buffer_t *p0, *b0;
- ip4_address_t resolve0;
- ethernet_arp_header_t *h0;
- vnet_hw_interface_t *hw_if0;
- 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);
-
- if (is_glean)
- {
- /* resolve the packet's destination */
- ip4_header_t *ip0 = vlib_buffer_get_current (p0);
- resolve0 = ip0->dst_address;
- }
- else
- {
- /* resolve the incomplete adj */
- resolve0 = adj0->sub_type.nbr.next_hop.ip4;
- }
-
- /* combine the address and interface for the hash key */
- sw_if_index0 = adj0->rewrite_header.sw_if_index;
- 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. */
- h0 =
- vlib_packet_template_get_packet (vm,
- &im->ip4_arp_request_packet_template,
- &bi0);
- /* Seems we're out of buffers */
- if (PREDICT_FALSE (!h0))
- {
- p0->error = node->errors[IP4_ARP_ERROR_NO_BUFFERS];
- continue;
- }
-
- b0 = vlib_get_buffer (vm, bi0);
-
- /* copy the persistent fields from the original */
- clib_memcpy_fast (b0->opaque2, p0->opaque2, sizeof (p0->opaque2));
-
- /* Add rewrite/encap string for ARP packet. */
- vnet_rewrite_one_header (adj0[0], h0, sizeof (ethernet_header_t));
-
- hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
-
- /* Src ethernet address in ARP header. */
- mac_address_from_bytes (&h0->ip4_over_ethernet[0].mac,
- hw_if0->hw_address);
- if (is_glean)
- {
- /* The interface's source address is stashed in the Glean Adj */
- h0->ip4_over_ethernet[0].ip4 =
- adj0->sub_type.glean.receive_addr.ip4;
- }
- else
- {
- /* Src IP address in ARP header. */
- if (ip4_src_address_for_packet (lm, sw_if_index0,
- &h0->ip4_over_ethernet[0].ip4))
- {
- /* No source address available */
- p0->error = node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
- vlib_buffer_free (vm, &bi0, 1);
- continue;
- }
- }
- h0->ip4_over_ethernet[1].ip4 = resolve0;
-
- p0->error = node->errors[IP4_ARP_ERROR_REQUEST_SENT];
-
- vlib_buffer_copy_trace_flag (vm, p0, bi0);
- VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
- vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
-
- vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
-
- vlib_set_next_frame_buffer (vm, node,
- adj0->rewrite_header.next_index, bi0);
- }
-
- 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] = "error-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] = "error-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);
-
-
-#ifndef CLIB_MARCH_VARIANT
-/* Send an ARP request to see if given destination is reachable on given interface. */
-clib_error_t *
-ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index,
- u8 refresh)
-{
- vnet_main_t *vnm = vnet_get_main ();
- ip4_main_t *im = &ip4_main;
- ethernet_arp_header_t *h;
- ip4_address_t *src;
- ip_interface_address_t *ia;
- ip_adjacency_t *adj;
- vnet_hw_interface_t *hi;
- vnet_sw_interface_t *si;
- vlib_buffer_t *b;
- adj_index_t ai;
- u32 bi = 0;
- u8 unicast_rewrite = 0;
-
- si = vnet_get_sw_interface (vnm, sw_if_index);
-
- if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
- {
- return clib_error_return (0, "%U: interface %U down",
- format_ip4_address, dst,
- format_vnet_sw_if_index_name, vnm,
- sw_if_index);
- }
-
- src =
- ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
- if (!src)
- {
- vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
- return clib_error_return
- (0,
- "no matching interface address for destination %U (interface %U)",
- format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
- sw_if_index);
- }
-
- h = vlib_packet_template_get_packet (vm,
- &im->ip4_arp_request_packet_template,
- &bi);
-
- if (!h)
- return clib_error_return (0, "ARP request packet allocation failed");
-
- hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
- if (PREDICT_FALSE (!hi->hw_address))
- {
- return clib_error_return (0, "%U: interface %U do not support ip probe",
- format_ip4_address, dst,
- format_vnet_sw_if_index_name, vnm,
- sw_if_index);
- }
-
- mac_address_from_bytes (&h->ip4_over_ethernet[0].mac, hi->hw_address);
-
- h->ip4_over_ethernet[0].ip4 = src[0];
- h->ip4_over_ethernet[1].ip4 = dst[0];
-
- b = vlib_get_buffer (vm, bi);
- vnet_buffer (b)->sw_if_index[VLIB_RX] =
- vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
-
- ip46_address_t nh = {
- .ip4 = *dst,
- };
-
- ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
- VNET_LINK_IP4, &nh, sw_if_index);
- adj = adj_get (ai);
-
- /* Peer has been previously resolved, retrieve glean adj instead */
- if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)
- {
- if (refresh)
- unicast_rewrite = 1;
- else
- {
- adj_unlock (ai);
- ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP4,
- VNET_LINK_IP4, sw_if_index, &nh);
- adj = adj_get (ai);
- }
- }
-
- /* Add encapsulation string for software interface (e.g. ethernet header). */
- vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
- if (unicast_rewrite)
- {
- u16 *etype = vlib_buffer_get_current (b) - 2;
- etype[0] = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
- }
- vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
-
- {
- 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);
- }
-
- adj_unlock (ai);
- return /* no error */ 0;
-}
-#endif
-
typedef enum
{
IP4_REWRITE_NEXT_DROP,
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