/* * Copyright (c) 2016 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/ip6.h: ip6 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_ip6_inlines_h #define included_ip_ip6_inlines_h #include <vnet/ip/ip6_packet.h> #include <vnet/ip/ip6_hop_by_hop_packet.h> /* Compute flow hash. We'll use it to select which Sponge to use for this flow. And other things. */ always_inline u32 ip6_compute_flow_hash (const ip6_header_t * ip, flow_hash_config_t flow_hash_config) { tcp_header_t *tcp; u64 a, b, c; u64 t1, t2; uword is_tcp_udp = 0; u8 protocol = ip->protocol; if (PREDICT_TRUE ((ip->protocol == IP_PROTOCOL_TCP) || (ip->protocol == IP_PROTOCOL_UDP))) { is_tcp_udp = 1; tcp = (void *) (ip + 1); } else if (ip->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS) { ip6_hop_by_hop_header_t *hbh = (ip6_hop_by_hop_header_t *) (ip + 1); if ((hbh->protocol == IP_PROTOCOL_TCP) || (hbh->protocol == IP_PROTOCOL_UDP)) { is_tcp_udp = 1; tcp = (tcp_header_t *) ((u8 *) hbh + ((hbh->length + 1) << 3)); } protocol = hbh->protocol; } t1 = (ip->src_address.as_u64[0] ^ ip->src_address.as_u64[1]); t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR) ? t1 : 0; t2 = (ip->dst_address.as_u64[0] ^ ip->dst_address.as_u64[1]); t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR) ? t2 : 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) ? protocol : 0; c = ((flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? ((t1 << 16) | t2) : ((t2 << 16) | t1)); t1 = ((u64) ip_flow_hash_router_id << 32); t1 |= ((flow_hash_config & IP_FLOW_HASH_FL) ? ip6_flow_label_network_order (ip) : 0); c ^= t1; hash_mix64 (a, b, c); return (u32) c; } /* ip6_locate_header * * This function is to search for the header specified by the protocol number * in find_hdr_type. * This is used to locate a specific IPv6 extension header * or to find transport layer header. * 1. If the find_hdr_type < 0 then it finds and returns the protocol number and * offset stored in *offset of the transport or ESP header in the chain if * found. * 2. If a header with find_hdr_type > 0 protocol number is found then the * offset is stored in *offset and protocol number of the header is * returned. * 3. If find_hdr_type is not found or packet is malformed or * it is a non-first fragment -1 is returned. */ always_inline int ip6_locate_header (vlib_buffer_t * p0, ip6_header_t * ip0, int find_hdr_type, u32 * offset) { u8 next_proto = ip0->protocol; u8 *next_header; u8 done = 0; u32 cur_offset; u8 *temp_nxthdr = 0; u32 exthdr_len = 0; next_header = ip6_next_header (ip0); cur_offset = sizeof (ip6_header_t); while (1) { done = (next_proto == find_hdr_type); if (PREDICT_FALSE (next_header >= (u8 *) vlib_buffer_get_current (p0) + p0->current_length)) { //A malicious packet could set an extension header with a too big size return (-1); } if (done) break; if ((!ip6_ext_hdr (next_proto)) || next_proto == IP_PROTOCOL_IP6_NONXT) { if (find_hdr_type < 0) break; return -1; } if (next_proto == IP_PROTOCOL_IPV6_FRAGMENTATION) { ip6_frag_hdr_t *frag_hdr = (ip6_frag_hdr_t *) next_header; u16 frag_off = ip6_frag_hdr_offset (frag_hdr); /* Non first fragment return -1 */ if (frag_off) return (-1); exthdr_len = sizeof (ip6_frag_hdr_t); temp_nxthdr = next_header + exthdr_len; } else if (next_proto == IP_PROTOCOL_IPSEC_AH) { exthdr_len = ip6_ext_authhdr_len (((ip6_ext_header_t *) next_header)); temp_nxthdr = next_header + exthdr_len; } else { exthdr_len = ip6_ext_header_len (((ip6_ext_header_t *) next_header)); temp_nxthdr = next_header + exthdr_len; } next_proto = ((ip6_ext_header_t *) next_header)->next_hdr; next_header = temp_nxthdr; cur_offset += exthdr_len; } *offset = cur_offset; return (next_proto); } /** * Push IPv6 header to buffer * * @param vm - vlib_main * @param b - buffer to write the header to * @param src - source IP * @param dst - destination IP * @param prot - payload proto * @param flow_label - flow label * * @return - pointer to start of IP header */ always_inline void * vlib_buffer_push_ip6_custom (vlib_main_t * vm, vlib_buffer_t * b, ip6_address_t * src, ip6_address_t * dst, int proto, u32 flow_label) { ip6_header_t *ip6h; u16 payload_length; /* make some room */ ip6h = vlib_buffer_push_uninit (b, sizeof (ip6_header_t)); ASSERT (flow_label < 1 << 20); ip6h->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 ((0x6 << 28) | flow_label); /* calculate ip6 payload length */ payload_length = vlib_buffer_length_in_chain (vm, b); payload_length -= sizeof (*ip6h); ip6h->payload_length = clib_host_to_net_u16 (payload_length); ip6h->hop_limit = 0xff; ip6h->protocol = proto; clib_memcpy_fast (ip6h->src_address.as_u8, src->as_u8, sizeof (ip6h->src_address)); clib_memcpy_fast (ip6h->dst_address.as_u8, dst->as_u8, sizeof (ip6h->src_address)); vnet_buffer (b)->l3_hdr_offset = (u8 *) ip6h - b->data; b->flags |= VNET_BUFFER_F_IS_IP6 | VNET_BUFFER_F_L3_HDR_OFFSET_VALID; return ip6h; } /** * Push IPv6 header to buffer * * @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_ip6 (vlib_main_t * vm, vlib_buffer_t * b, ip6_address_t * src, ip6_address_t * dst, int proto) { return vlib_buffer_push_ip6_custom (vm, b, src, dst, proto, 0 /* flow label */ ); } #endif /* included_ip_ip6_h */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */