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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_inlines_h
+#define included_ip_ip4_inlines_h
+
+#include <vnet/ip/ip_flow_hash.h>
+#include <vnet/ip/ip4_packet.h>
+
+#define IP_DF 0x4000 /* don't fragment */
+
+/* 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;
+
+ 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;
+
+ if (flow_hash_config & IP_FLOW_HASH_SYMMETRIC)
+ {
+ if (b < a)
+ {
+ c = a;
+ a = b;
+ b = c;
+ }
+ if (t2 < t1)
+ {
+ t2 += t1;
+ t1 = t2 - t1;
+ t2 = t2 - t1;
+ }
+ }
+
+ b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 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;
+}
+
+always_inline void *
+vlib_buffer_push_ip4_custom (vlib_main_t * vm, vlib_buffer_t * b,
+ ip4_address_t * src, ip4_address_t * dst,
+ int proto, u8 csum_offload, u8 is_df)
+{
+ 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 = is_df ? clib_host_to_net_u16 (IP_DF) : 0;
+ ih->ttl = 255;
+ ih->protocol = proto;
+ ih->src_address.as_u32 = src->as_u32;
+ ih->dst_address.as_u32 = dst->as_u32;
+
+ vnet_buffer (b)->l3_hdr_offset = (u8 *) ih - b->data;
+ b->flags |= VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_L3_HDR_OFFSET_VALID;
+
+ /* Offload ip4 header checksum generation */
+ if (csum_offload)
+ {
+ ih->checksum = 0;
+ b->flags |= VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
+ }
+ else
+ ih->checksum = ip4_header_checksum (ih);
+
+ return ih;
+}
+
+/**
+ * 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)
+{
+ return vlib_buffer_push_ip4_custom (vm, b, src, dst, proto, csum_offload,
+ 1 /* is_df */ );
+}
+
+#endif /* included_ip_ip4_inlines_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */