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+/*
+ * 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.h: ip4 main include file
+ *
+ * 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.
+ */
+
+#ifndef included_ip_ip4_h
+#define included_ip_ip4_h
+
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/ip/lookup.h>
+#include <vnet/buffer.h>
+#include <vnet/feature/feature.h>
+#include <vnet/ip/icmp46_packet.h>
+
+typedef struct ip4_mfib_t
+{
+ /* Hash table for each prefix length mapping. */
+ uword *fib_entry_by_dst_address[65];
+
+ /* Table ID (hash key) for this FIB. */
+ u32 table_id;
+
+ /* Index into FIB vector. */
+ u32 index;
+} ip4_mfib_t;
+
+struct ip4_main_t;
+
+typedef void (ip4_add_del_interface_address_function_t)
+ (struct ip4_main_t * im,
+ uword opaque,
+ u32 sw_if_index,
+ ip4_address_t * address,
+ u32 address_length, u32 if_address_index, u32 is_del);
+
+typedef struct
+{
+ ip4_add_del_interface_address_function_t *function;
+ uword function_opaque;
+} ip4_add_del_interface_address_callback_t;
+
+typedef void (ip4_table_bind_function_t)
+ (struct ip4_main_t * im,
+ uword opaque, u32 sw_if_index, u32 new_fib_index, u32 old_fib_index);
+
+typedef struct
+{
+ ip4_table_bind_function_t *function;
+ uword function_opaque;
+} ip4_table_bind_callback_t;
+
+/**
+ * @brief IPv4 main type.
+ *
+ * State of IPv4 VPP processing including:
+ * - FIBs
+ * - Feature indices used in feature topological sort
+ * - Feature node run time references
+ */
+
+typedef struct ip4_main_t
+{
+ ip_lookup_main_t lookup_main;
+
+ /** Vector of FIBs. */
+ struct fib_table_t_ *fibs;
+
+ /** Vector of MTries. */
+ struct ip4_fib_t_ *v4_fibs;
+
+ /** Vector of MFIBs. */
+ struct mfib_table_t_ *mfibs;
+
+ u32 fib_masks[33];
+
+ /** Table index indexed by software interface. */
+ u32 *fib_index_by_sw_if_index;
+
+ /** Table index indexed by software interface. */
+ u32 *mfib_index_by_sw_if_index;
+
+ /* IP4 enabled count by software interface */
+ u8 *ip_enabled_by_sw_if_index;
+
+ /** Hash table mapping table id to fib index.
+ ID space is not necessarily dense; index space is dense. */
+ uword *fib_index_by_table_id;
+
+ /** Hash table mapping table id to multicast fib index.
+ ID space is not necessarily dense; index space is dense. */
+ uword *mfib_index_by_table_id;
+
+ /** Functions to call when interface address changes. */
+ ip4_add_del_interface_address_callback_t
+ * add_del_interface_address_callbacks;
+
+ /** Functions to call when interface to table biding changes. */
+ ip4_table_bind_callback_t *table_bind_callbacks;
+
+ /** Template used to generate IP4 ARP packets. */
+ vlib_packet_template_t ip4_arp_request_packet_template;
+
+ /** Seed for Jenkins hash used to compute ip4 flow hash. */
+ u32 flow_hash_seed;
+
+ /** @brief Template information for VPP generated packets */
+ struct
+ {
+ /** TTL to use for host generated packets. */
+ u8 ttl;
+
+ /** TOS byte to use for host generated packets. */
+ u8 tos;
+
+ u8 pad[2];
+ } host_config;
+} ip4_main_t;
+
+/** Global ip4 main structure. */
+extern ip4_main_t ip4_main;
+
+/** Global ip4 input node. Errors get attached to ip4 input node. */
+extern vlib_node_registration_t ip4_input_node;
+extern vlib_node_registration_t ip4_lookup_node;
+extern vlib_node_registration_t ip4_local_node;
+extern vlib_node_registration_t ip4_rewrite_node;
+extern vlib_node_registration_t ip4_rewrite_mcast_node;
+extern vlib_node_registration_t ip4_rewrite_local_node;
+extern vlib_node_registration_t ip4_arp_node;
+extern vlib_node_registration_t ip4_glean_node;
+extern vlib_node_registration_t ip4_midchain_node;
+
+always_inline uword
+ip4_destination_matches_route (const ip4_main_t * im,
+ const ip4_address_t * key,
+ const ip4_address_t * dest, uword dest_length)
+{
+ return 0 == ((key->data_u32 ^ dest->data_u32) & im->fib_masks[dest_length]);
+}
+
+always_inline uword
+ip4_destination_matches_interface (ip4_main_t * im,
+ ip4_address_t * key,
+ ip_interface_address_t * ia)
+{
+ ip4_address_t *a = ip_interface_address_get_address (&im->lookup_main, ia);
+ return ip4_destination_matches_route (im, key, a, ia->address_length);
+}
+
+/* As above but allows for unaligned destinations (e.g. works right from IP header of packet). */
+always_inline uword
+ip4_unaligned_destination_matches_route (ip4_main_t * im,
+ ip4_address_t * key,
+ ip4_address_t * dest,
+ uword dest_length)
+{
+ return 0 ==
+ ((clib_mem_unaligned (&key->data_u32, u32) ^ dest->
+ data_u32) & im->fib_masks[dest_length]);
+}
+
+always_inline int
+ip4_src_address_for_packet (ip_lookup_main_t * lm,
+ u32 sw_if_index, ip4_address_t * src)
+{
+ u32 if_add_index = lm->if_address_pool_index_by_sw_if_index[sw_if_index];
+ if (PREDICT_TRUE (if_add_index != ~0))
+ {
+ ip_interface_address_t *if_add =
+ pool_elt_at_index (lm->if_address_pool, if_add_index);
+ ip4_address_t *if_ip = ip_interface_address_get_address (lm, if_add);
+ *src = *if_ip;
+ return 0;
+ }
+ else
+ {
+ src->as_u32 = 0;
+ }
+ return (!0);
+}
+
+/* Find interface address which matches destination. */
+always_inline ip4_address_t *
+ip4_interface_address_matching_destination (ip4_main_t * im,
+ ip4_address_t * dst,
+ u32 sw_if_index,
+ ip_interface_address_t **
+ result_ia)
+{
+ ip_lookup_main_t *lm = &im->lookup_main;
+ ip_interface_address_t *ia;
+ ip4_address_t *result = 0;
+
+ /* *INDENT-OFF* */
+ foreach_ip_interface_address (lm, ia, sw_if_index,
+ 1 /* honor unnumbered */,
+ ({
+ ip4_address_t * a = ip_interface_address_get_address (lm, ia);
+ if (ip4_destination_matches_route (im, dst, a, ia->address_length))
+ {
+ result = a;
+ break;
+ }
+ }));
+ /* *INDENT-ON* */
+ if (result_ia)
+ *result_ia = result ? ia : 0;
+ return result;
+}
+
+ip4_address_t *ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
+ ip_interface_address_t **
+ result_ia);
+
+clib_error_t *ip4_add_del_interface_address (vlib_main_t * vm,
+ u32 sw_if_index,
+ ip4_address_t * address,
+ u32 address_length, u32 is_del);
+
+void ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable);
+
+int ip4_address_compare (ip4_address_t * a1, ip4_address_t * a2);
+
+/* 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);
+
+clib_error_t *ip4_set_arp_limit (u32 arp_limit);
+
+uword
+ip4_udp_register_listener (vlib_main_t * vm,
+ u16 dst_port, u32 next_node_index);
+
+void
+ip4_icmp_register_type (vlib_main_t * vm, icmp4_type_t type, u32 node_index);
+
+u16 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
+ ip4_header_t * ip0);
+
+void ip4_register_protocol (u32 protocol, u32 node_index);
+
+serialize_function_t serialize_vnet_ip4_main, unserialize_vnet_ip4_main;
+
+int vnet_set_ip4_flow_hash (u32 table_id,
+ flow_hash_config_t flow_hash_config);
+
+int vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
+ u32 table_index);
+
+/* Compute flow hash. We'll use it to select which adjacency to use for this
+ flow. And other things. */
+always_inline u32
+ip4_compute_flow_hash (const ip4_header_t * ip,
+ flow_hash_config_t flow_hash_config)
+{
+ tcp_header_t *tcp = (void *) (ip + 1);
+ u32 a, b, c, t1, t2;
+ uword is_tcp_udp = (ip->protocol == IP_PROTOCOL_TCP
+ || ip->protocol == IP_PROTOCOL_UDP);
+
+ t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR)
+ ? ip->src_address.data_u32 : 0;
+ t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR)
+ ? ip->dst_address.data_u32 : 0;
+
+ a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
+ b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
+ b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0;
+
+ t1 = is_tcp_udp ? tcp->src : 0;
+ t2 = is_tcp_udp ? tcp->dst : 0;
+
+ t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
+ t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
+
+ c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
+ (t1 << 16) | t2 : (t2 << 16) | t1;
+
+ hash_v3_mix32 (a, b, c);
+ hash_v3_finalize32 (a, b, c);
+
+ return c;
+}
+
+void
+ip4_forward_next_trace (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame,
+ vlib_rx_or_tx_t which_adj_index);
+
+u8 *format_ip4_forward_next_trace (u8 * s, va_list * args);
+
+u32 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0);
+
+#define IP_DF 0x4000 /* don't fragment */
+
+/**
+ * Push IPv4 header to buffer
+ *
+ * This does not support fragmentation.
+ *
+ * @param vm - vlib_main
+ * @param b - buffer to write the header to
+ * @param src - source IP
+ * @param dst - destination IP
+ * @param prot - payload proto
+ *
+ * @return - pointer to start of IP header
+ */
+always_inline void *
+vlib_buffer_push_ip4 (vlib_main_t * vm, vlib_buffer_t * b,
+ ip4_address_t * src, ip4_address_t * dst, int proto,
+ u8 csum_offload)
+{
+ ip4_header_t *ih;
+
+ /* make some room */
+ ih = vlib_buffer_push_uninit (b, sizeof (ip4_header_t));
+
+ ih->ip_version_and_header_length = 0x45;
+ ih->tos = 0;
+ ih->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b));
+
+ /* No fragments */
+ ih->flags_and_fragment_offset = clib_host_to_net_u16 (IP_DF);
+ ih->ttl = 255;
+ ih->protocol = proto;
+ ih->src_address.as_u32 = src->as_u32;
+ ih->dst_address.as_u32 = dst->as_u32;
+
+ /* Offload ip4 header checksum generation */
+ if (csum_offload)
+ {
+ ih->checksum = 0;
+ b->flags |= VNET_BUFFER_F_OFFLOAD_IP_CKSUM | VNET_BUFFER_F_IS_IP4;
+ vnet_buffer (b)->l3_hdr_offset = (u8 *) ih - b->data;
+ vnet_buffer (b)->l4_hdr_offset = vnet_buffer (b)->l3_hdr_offset +
+ sizeof (*ih);
+ }
+ else
+ ih->checksum = ip4_header_checksum (ih);
+
+ return ih;
+}
+#endif /* included_ip_ip4_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */