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+/*
+ * 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);
+
+ 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:
+ */