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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_h
+#define included_ip_ip6_h
+
+#include <vlib/mc.h>
+#include <vlib/buffer.h>
+#include <vnet/ethernet/packet.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/ip/ip6_hop_by_hop_packet.h>
+#include <vnet/ip/lookup.h>
+#include <stdbool.h>
+#include <vppinfra/bihash_24_8.h>
+#include <vppinfra/bihash_template.h>
+#include <vnet/util/radix.h>
+
+/*
+ * Default size of the ip6 fib hash table
+ */
+#define IP6_FIB_DEFAULT_HASH_NUM_BUCKETS (64 * 1024)
+#define IP6_FIB_DEFAULT_HASH_MEMORY_SIZE (32<<20)
+
+typedef struct
+{
+ ip6_address_t addr;
+ u32 dst_address_length;
+ u32 vrf_index;
+} ip6_fib_key_t;
+
+typedef struct
+{
+ /* Table ID (hash key) for this FIB. */
+ u32 table_id;
+
+ /* Index into FIB vector. */
+ u32 index;
+} ip6_fib_t;
+
+typedef struct ip6_mfib_t
+{
+ /* Table ID (hash key) for this FIB. */
+ u32 table_id;
+
+ /* Index into FIB vector. */
+ u32 index;
+
+ /*
+ * Pointer to the top of a radix tree.
+ * This cannot be realloc'd, hence it cannot be inlined with this table
+ */
+ struct radix_node_head *rhead;
+} ip6_mfib_t;
+
+struct ip6_main_t;
+
+typedef void (ip6_add_del_interface_address_function_t)
+ (struct ip6_main_t * im,
+ uword opaque,
+ u32 sw_if_index,
+ ip6_address_t * address,
+ u32 address_length, u32 if_address_index, u32 is_del);
+
+typedef struct
+{
+ ip6_add_del_interface_address_function_t *function;
+ uword function_opaque;
+} ip6_add_del_interface_address_callback_t;
+
+typedef void (ip6_table_bind_function_t)
+ (struct ip6_main_t * im,
+ uword opaque, u32 sw_if_index, u32 new_fib_index, u32 old_fib_index);
+
+typedef struct
+{
+ ip6_table_bind_function_t *function;
+ uword function_opaque;
+} ip6_table_bind_callback_t;
+
+/**
+ * Enumeration of the FIB table instance types
+ */
+typedef enum ip6_fib_table_instance_type_t_
+{
+ /**
+ * This table stores the routes that are used to forward traffic.
+ * The key is the prefix, the result the adjacnecy to forward on.
+ */
+ IP6_FIB_TABLE_FWDING,
+ /**
+ * The table that stores ALL routes learned by the DP.
+ * Some of these routes may not be ready to install in forwarding
+ * at a given time.
+ * The key in this table is the prefix, the result is the fib_entry_t
+ */
+ IP6_FIB_TABLE_NON_FWDING,
+} ip6_fib_table_instance_type_t;
+
+#define IP6_FIB_NUM_TABLES (IP6_FIB_TABLE_NON_FWDING+1)
+
+/**
+ * A represenation of a single IP6 table
+ */
+typedef struct ip6_fib_table_instance_t_
+{
+ /* The hash table */
+ BVT (clib_bihash) ip6_hash;
+
+ /* bitmap / refcounts / vector of mask widths to search */
+ uword *non_empty_dst_address_length_bitmap;
+ u8 *prefix_lengths_in_search_order;
+ i32 dst_address_length_refcounts[129];
+} ip6_fib_table_instance_t;
+
+typedef struct ip6_main_t
+{
+ /**
+ * The two FIB tables; fwding and non-fwding
+ */
+ ip6_fib_table_instance_t ip6_table[IP6_FIB_NUM_TABLES];
+
+ ip_lookup_main_t lookup_main;
+
+ /* Pool of FIBs. */
+ struct fib_table_t_ *fibs;
+
+ /* Pool of V6 FIBs. */
+ ip6_fib_t *v6_fibs;
+
+ /** Vector of MFIBs. */
+ struct mfib_table_t_ *mfibs;
+
+ /* Network byte orders subnet mask for each prefix length */
+ ip6_address_t fib_masks[129];
+
+ /* Table index indexed by software interface. */
+ u32 *fib_index_by_sw_if_index;
+
+ /** Table index indexed by software interface. */
+ u32 *mfib_index_by_sw_if_index;
+
+ /* IP6 enabled count by software interface */
+ u8 *ip_enabled_by_sw_if_index;
+
+ /* Hash table mapping table id to fib index.
+ ID space is not necessarily dense; index space is dense. */
+ uword *fib_index_by_table_id;
+
+ /** Hash table mapping table id to multicast fib index.
+ ID space is not necessarily dense; index space is dense. */
+ uword *mfib_index_by_table_id;
+
+ /* Hash table mapping interface rewrite adjacency index by sw if index. */
+ uword *interface_route_adj_index_by_sw_if_index;
+
+ /* Functions to call when interface address changes. */
+ ip6_add_del_interface_address_callback_t
+ * add_del_interface_address_callbacks;
+
+ /** Functions to call when interface to table biding changes. */
+ ip6_table_bind_callback_t *table_bind_callbacks;
+
+ /* Template used to generate IP6 neighbor solicitation packets. */
+ vlib_packet_template_t discover_neighbor_packet_template;
+
+ /* ip6 lookup table config parameters */
+ u32 lookup_table_nbuckets;
+ uword lookup_table_size;
+
+ /* Seed for Jenkins hash used to compute ip6 flow hash. */
+ u32 flow_hash_seed;
+
+ struct
+ {
+ /* TTL to use for host generated packets. */
+ u8 ttl;
+
+ u8 pad[3];
+ } host_config;
+
+ /* HBH processing enabled? */
+ u8 hbh_enabled;
+} ip6_main_t;
+
+/* Global ip6 main structure. */
+extern ip6_main_t ip6_main;
+
+/* Global ip6 input node. Errors get attached to ip6 input node. */
+extern vlib_node_registration_t ip6_input_node;
+extern vlib_node_registration_t ip6_rewrite_node;
+extern vlib_node_registration_t ip6_rewrite_mcast_node;
+extern vlib_node_registration_t ip6_rewrite_local_node;
+extern vlib_node_registration_t ip6_discover_neighbor_node;
+extern vlib_node_registration_t ip6_glean_node;
+extern vlib_node_registration_t ip6_midchain_node;
+
+always_inline uword
+ip6_destination_matches_route (const ip6_main_t * im,
+ const ip6_address_t * key,
+ const ip6_address_t * dest, uword dest_length)
+{
+ int i;
+ for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
+ {
+ if ((key->as_uword[i] ^ dest->as_uword[i]) & im->
+ fib_masks[dest_length].as_uword[i])
+ return 0;
+ }
+ return 1;
+}
+
+always_inline uword
+ip6_destination_matches_interface (ip6_main_t * im,
+ ip6_address_t * key,
+ ip_interface_address_t * ia)
+{
+ ip6_address_t *a = ip_interface_address_get_address (&im->lookup_main, ia);
+ return ip6_destination_matches_route (im, key, a, ia->address_length);
+}
+
+/* As above but allows for unaligned destinations (e.g. works right from IP header of packet). */
+always_inline uword
+ip6_unaligned_destination_matches_route (ip6_main_t * im,
+ ip6_address_t * key,
+ ip6_address_t * dest,
+ uword dest_length)
+{
+ int i;
+ for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
+ {
+ if ((clib_mem_unaligned (&key->as_uword[i], uword) ^ dest->as_uword[i])
+ & im->fib_masks[dest_length].as_uword[i])
+ return 0;
+ }
+ return 1;
+}
+
+always_inline int
+ip6_src_address_for_packet (ip_lookup_main_t * lm,
+ u32 sw_if_index, ip6_address_t * src)
+{
+ u32 if_add_index = lm->if_address_pool_index_by_sw_if_index[sw_if_index];
+ if (PREDICT_TRUE (if_add_index != ~0))
+ {
+ ip_interface_address_t *if_add =
+ pool_elt_at_index (lm->if_address_pool, if_add_index);
+ ip6_address_t *if_ip = ip_interface_address_get_address (lm, if_add);
+ *src = *if_ip;
+ return (0);
+ }
+ else
+ {
+ src->as_u64[0] = 0;
+ src->as_u64[1] = 0;
+ }
+ return (!0);
+}
+
+/* Find interface address which matches destination. */
+always_inline ip6_address_t *
+ip6_interface_address_matching_destination (ip6_main_t * im,
+ ip6_address_t * dst,
+ u32 sw_if_index,
+ ip_interface_address_t **
+ result_ia)
+{
+ ip_lookup_main_t *lm = &im->lookup_main;
+ ip_interface_address_t *ia;
+ ip6_address_t *result = 0;
+
+ /* *INDENT-OFF* */
+ foreach_ip_interface_address (lm, ia, sw_if_index,
+ 1 /* honor unnumbered */,
+ ({
+ ip6_address_t * a = ip_interface_address_get_address (lm, ia);
+ if (ip6_destination_matches_route (im, dst, a, ia->address_length))
+ {
+ result = a;
+ break;
+ }
+ }));
+ /* *INDENT-ON* */
+ if (result_ia)
+ *result_ia = result ? ia : 0;
+ return result;
+}
+
+clib_error_t *ip6_add_del_interface_address (vlib_main_t * vm,
+ u32 sw_if_index,
+ ip6_address_t * address,
+ u32 address_length, u32 is_del);
+void ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable);
+
+/**
+ * @brie get first IPv6 interface address
+ */
+ip6_address_t *ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index);
+
+int ip6_address_compare (ip6_address_t * a1, ip6_address_t * a2);
+
+clib_error_t *ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst,
+ u32 sw_if_index);
+
+uword
+ip6_udp_register_listener (vlib_main_t * vm,
+ u16 dst_port, u32 next_node_index);
+
+u16 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
+ ip6_header_t * ip0,
+ int *bogus_lengthp);
+
+void ip6_register_protocol (u32 protocol, u32 node_index);
+
+serialize_function_t serialize_vnet_ip6_main, unserialize_vnet_ip6_main;
+
+void ip6_ethernet_update_adjacency (vnet_main_t * vnm,
+ u32 sw_if_index, u32 ai);
+
+
+void
+ip6_link_local_address_from_ethernet_mac_address (ip6_address_t * ip,
+ u8 * mac);
+
+void
+ip6_ethernet_mac_address_from_link_local_address (u8 * mac,
+ ip6_address_t * ip);
+
+int vnet_set_ip6_flow_hash (u32 table_id,
+ flow_hash_config_t flow_hash_config);
+
+clib_error_t *enable_ip6_interface (vlib_main_t * vm, u32 sw_if_index);
+
+clib_error_t *disable_ip6_interface (vlib_main_t * vm, u32 sw_if_index);
+
+int ip6_interface_enabled (vlib_main_t * vm, u32 sw_if_index);
+
+clib_error_t *set_ip6_link_local_address (vlib_main_t * vm,
+ u32 sw_if_index,
+ ip6_address_t * address);
+
+int vnet_add_del_ip6_nd_change_event (vnet_main_t * vnm,
+ void *data_callback,
+ u32 pid,
+ void *address_arg,
+ uword node_index,
+ uword type_opaque,
+ uword data, int is_add);
+
+int vnet_ip6_nd_term (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_buffer_t * p0,
+ ethernet_header_t * eth,
+ ip6_header_t * ip, u32 sw_if_index, u16 bd_index);
+
+void send_ip6_na (vlib_main_t * vm, vnet_hw_interface_t * hi);
+
+u8 *format_ip6_forward_next_trace (u8 * s, va_list * args);
+
+u32 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0);
+
+int vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
+ u32 table_index);
+extern vlib_node_registration_t ip6_lookup_node;
+
+/* 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;
+ b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? protocol : 0;
+
+ 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;
+
+ 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);
+}
+
+u8 *format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args);
+/*
+ * Hop-by-Hop handling
+ */
+typedef struct
+{
+ /* Array of function pointers to HBH option handling routines */
+ int (*options[256]) (vlib_buffer_t * b, ip6_header_t * ip,
+ ip6_hop_by_hop_option_t * opt);
+ u8 *(*trace[256]) (u8 * s, ip6_hop_by_hop_option_t * opt);
+ uword next_override;
+} ip6_hop_by_hop_main_t;
+
+extern ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
+
+int ip6_hbh_register_option (u8 option,
+ int options (vlib_buffer_t * b,
+ ip6_header_t * ip,
+ ip6_hop_by_hop_option_t * opt),
+ u8 * trace (u8 * s,
+ ip6_hop_by_hop_option_t * opt));
+int ip6_hbh_unregister_option (u8 option);
+void ip6_hbh_set_next_override (uword next);
+
+/**
+ * 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)
+{
+ ip6_header_t *ip6h;
+ u16 payload_length;
+
+ /* make some room */
+ ip6h = vlib_buffer_push_uninit (b, sizeof (ip6_header_t));
+
+ ip6h->ip_version_traffic_class_and_flow_label =
+ clib_host_to_net_u32 (0x6 << 28);
+
+ /* 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 (ip6h->src_address.as_u8, src->as_u8,
+ sizeof (ip6h->src_address));
+ clib_memcpy (ip6h->dst_address.as_u8, dst->as_u8,
+ sizeof (ip6h->src_address));
+ b->flags |= VNET_BUFFER_F_IS_IP6;
+
+ return ip6h;
+}
+
+#endif /* included_ip_ip6_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */