/* * 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: */