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Diffstat (limited to 'src/vnet/ip/ip4_inlines.h')
| -rw-r--r-- | src/vnet/ip/ip4_inlines.h | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/src/vnet/ip/ip4_inlines.h b/src/vnet/ip/ip4_inlines.h new file mode 100644 index 00000000000..bdb82af0034 --- /dev/null +++ b/src/vnet/ip/ip4_inlines.h @@ -0,0 +1,165 @@ +/* + * 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: + */ |