Line data    Source code

       1             : /*
       2             :  * Copyright (c) 2016 Cisco and/or its affiliates.
       3             :  * Licensed under the Apache License, Version 2.0 (the "License");
       4             :  * you may not use this file except in compliance with the License.
       5             :  * You may obtain a copy of the License at:
       6             :  *
       7             :  *     http://www.apache.org/licenses/LICENSE-2.0
       8             :  *
       9             :  * Unless required by applicable law or agreed to in writing, software
      10             :  * distributed under the License is distributed on an "AS IS" BASIS,
      11             :  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             :  * See the License for the specific language governing permissions and
      13             :  * limitations under the License.
      14             :  */
      15             : /*
      16             :  * ip/ip6.h: ip6 main include file
      17             :  *
      18             :  * Copyright (c) 2008 Eliot Dresselhaus
      19             :  *
      20             :  * Permission is hereby granted, free of charge, to any person obtaining
      21             :  * a copy of this software and associated documentation files (the
      22             :  * "Software"), to deal in the Software without restriction, including
      23             :  * without limitation the rights to use, copy, modify, merge, publish,
      24             :  * distribute, sublicense, and/or sell copies of the Software, and to
      25             :  * permit persons to whom the Software is furnished to do so, subject to
      26             :  * the following conditions:
      27             :  *
      28             :  * The above copyright notice and this permission notice shall be
      29             :  * included in all copies or substantial portions of the Software.
      30             :  *
      31             :  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
      32             :  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
      33             :  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
      34             :  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
      35             :  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
      36             :  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
      37             :  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
      38             :  */
      39             : 
      40             : #ifndef included_ip_ip6_inlines_h
      41             : #define included_ip_ip6_inlines_h
      42             : 
      43             : #include <vnet/ip/ip6_packet.h>
      44             : #include <vnet/ip/ip6_hop_by_hop_packet.h>
      45             : 
      46             : /* Compute flow hash.  We'll use it to select which Sponge to use for this
      47             :    flow.  And other things. */
      48             : always_inline u32
      49        3792 : ip6_compute_flow_hash (const ip6_header_t * ip,
      50             :                        flow_hash_config_t flow_hash_config)
      51             : {
      52             :   tcp_header_t *tcp;
      53        3792 :   udp_header_t *udp = (void *) (ip + 1);
      54        3792 :   gtpv1u_header_t *gtpu = (void *) (udp + 1);
      55             :   u64 a, b, c;
      56             :   u64 t1, t2;
      57             :   u32 t3;
      58        3792 :   uword is_tcp_udp = 0;
      59        3792 :   uword is_udp = ip->protocol == IP_PROTOCOL_UDP;
      60        3792 :   u8 protocol = ip->protocol;
      61             : 
      62        3792 :   if (PREDICT_TRUE ((ip->protocol == IP_PROTOCOL_TCP) || is_udp))
      63             :     {
      64        1890 :       is_tcp_udp = 1;
      65        1890 :       tcp = (void *) (ip + 1);
      66             :     }
      67        1902 :   else if (ip->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)
      68             :     {
      69          82 :       ip6_hop_by_hop_header_t *hbh = (ip6_hop_by_hop_header_t *) (ip + 1);
      70          82 :       if ((hbh->protocol == IP_PROTOCOL_TCP) ||
      71          82 :           (hbh->protocol == IP_PROTOCOL_UDP))
      72             :         {
      73           0 :           is_tcp_udp = 1;
      74           0 :           tcp = (tcp_header_t *) ((u8 *) hbh + ((hbh->length + 1) << 3));
      75             :         }
      76          82 :       protocol = hbh->protocol;
      77             :     }
      78             : 
      79        3792 :   t1 = (ip->src_address.as_u64[0] ^ ip->src_address.as_u64[1]);
      80        3792 :   t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR) ? t1 : 0;
      81             : 
      82        3792 :   t2 = (ip->dst_address.as_u64[0] ^ ip->dst_address.as_u64[1]);
      83        3792 :   t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR) ? t2 : 0;
      84             : 
      85        3792 :   a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
      86        3792 :   b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
      87             : 
      88        3792 :   t1 = is_tcp_udp ? tcp->src : 0;
      89        3792 :   t2 = is_tcp_udp ? tcp->dst : 0;
      90             : 
      91        3792 :   t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
      92        3792 :   t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
      93             : 
      94        3792 :   if (flow_hash_config & IP_FLOW_HASH_SYMMETRIC)
      95             :     {
      96           0 :       if (b < a)
      97             :         {
      98           0 :           c = a;
      99           0 :           a = b;
     100           0 :           b = c;
     101             :         }
     102           0 :       if (t2 < t1)
     103             :         {
     104           0 :           t2 += t1;
     105           0 :           t1 = t2 - t1;
     106           0 :           t2 = t2 - t1;
     107             :         }
     108             :     }
     109             : 
     110        3792 :   b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? protocol : 0;
     111        3792 :   c = ((flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? ((t1 << 16) | t2) :
     112        3792 :                                                            ((t2 << 16) | t1));
     113        3792 :   t1 = ((u64) ip_flow_hash_router_id << 32);
     114        3792 :   t1 |=
     115        3792 :     ((flow_hash_config & IP_FLOW_HASH_FL) ? ip6_flow_label_network_order (ip) :
     116             :                                             0);
     117        3792 :   c ^= t1;
     118        3792 :   if (PREDICT_TRUE (is_udp) &&
     119        1848 :       PREDICT_FALSE ((flow_hash_config & IP_FLOW_HASH_GTPV1_TEID) &&
     120             :                      udp->dst_port == GTPV1_PORT_BE))
     121             :     {
     122           0 :       t3 = gtpu->teid;
     123           0 :       a ^= t3;
     124             :     }
     125        3792 :   hash_mix64 (a, b, c);
     126        3792 :   return (u32) c;
     127             : }
     128             : 
     129             : /* ip6_locate_header
     130             :  *
     131             :  * This function is to search for the header specified by the protocol number
     132             :  * in find_hdr_type.
     133             :  * This is used to locate a specific IPv6 extension header
     134             :  * or to find transport layer header.
     135             :  *   1. If the find_hdr_type < 0 then it finds and returns the protocol number and
     136             :  *   offset stored in *offset of the transport or ESP header in the chain if
     137             :  *   found.
     138             :  *   2. If a header with find_hdr_type > 0 protocol number is found then the
     139             :  *      offset is stored in *offset and protocol number of the header is
     140             :  *      returned.
     141             :  *   3. If find_hdr_type is not found or packet is malformed or
     142             :  *      it is a non-first fragment -1 is returned.
     143             :  */
     144             : always_inline int
     145       60615 : ip6_locate_header (vlib_buffer_t *b, ip6_header_t *ip, int find_hdr_type,
     146             :                    u32 *offset)
     147             : {
     148             :   ip6_ext_hdr_chain_t hdr_chain;
     149       60615 :   int res = ip6_ext_header_walk (b, ip, find_hdr_type, &hdr_chain);
     150       60615 :   if (res >= 0)
     151             :     {
     152       60613 :       *offset = hdr_chain.eh[res].offset;
     153       60613 :       return hdr_chain.eh[res].protocol;
     154             :     }
     155           2 :   return -1;
     156             : }
     157             : 
     158             : 
     159             : /**
     160             :  * Push IPv6 header to buffer
     161             :  *
     162             :  * @param vm - vlib_main
     163             :  * @param b - buffer to write the header to
     164             :  * @param src - source IP
     165             :  * @param dst - destination IP
     166             :  * @param prot - payload proto
     167             :  * @param flow_label - flow label
     168             :  *
     169             :  * @return - pointer to start of IP header
     170             :  */
     171             : always_inline void *
     172          17 : vlib_buffer_push_ip6_custom (vlib_main_t * vm, vlib_buffer_t * b,
     173             :                              ip6_address_t * src, ip6_address_t * dst,
     174             :                              int proto, u32 flow_label)
     175             : {
     176             :   ip6_header_t *ip6h;
     177             :   u16 payload_length;
     178             : 
     179             :   /* make some room */
     180          17 :   ip6h = vlib_buffer_push_uninit (b, sizeof (ip6_header_t));
     181          17 :   ASSERT (flow_label < 1 << 20);
     182          17 :   ip6h->ip_version_traffic_class_and_flow_label =
     183          17 :     clib_host_to_net_u32 ((0x6 << 28) | flow_label);
     184             : 
     185             :   /* calculate ip6 payload length */
     186          17 :   payload_length = vlib_buffer_length_in_chain (vm, b);
     187          17 :   payload_length -= sizeof (*ip6h);
     188             : 
     189          17 :   ip6h->payload_length = clib_host_to_net_u16 (payload_length);
     190             : 
     191          17 :   ip6h->hop_limit = 0xff;
     192          17 :   ip6h->protocol = proto;
     193          17 :   clib_memcpy_fast (ip6h->src_address.as_u8, src->as_u8,
     194             :                     sizeof (ip6h->src_address));
     195          17 :   clib_memcpy_fast (ip6h->dst_address.as_u8, dst->as_u8,
     196             :                     sizeof (ip6h->src_address));
     197          17 :   vnet_buffer (b)->l3_hdr_offset = (u8 *) ip6h - b->data;
     198          17 :   b->flags |= VNET_BUFFER_F_IS_IP6 | VNET_BUFFER_F_L3_HDR_OFFSET_VALID;
     199             : 
     200          17 :   return ip6h;
     201             : }
     202             : 
     203             : /**
     204             :  * Push IPv6 header to buffer
     205             :  *
     206             :  * @param vm - vlib_main
     207             :  * @param b - buffer to write the header to
     208             :  * @param src - source IP
     209             :  * @param dst - destination IP
     210             :  * @param prot - payload proto
     211             :  *
     212             :  * @return - pointer to start of IP header
     213             :  */
     214             : always_inline void *
     215           0 : vlib_buffer_push_ip6 (vlib_main_t * vm, vlib_buffer_t * b,
     216             :                       ip6_address_t * src, ip6_address_t * dst, int proto)
     217             : {
     218           0 :   return vlib_buffer_push_ip6_custom (vm, b, src, dst, proto,
     219             :                                       0 /* flow label */ );
     220             : 
     221             : }
     222             : 
     223             : #endif /* included_ip_ip6_h */
     224             : 
     225             : /*
     226             :  * fd.io coding-style-patch-verification: ON
     227             :  *
     228             :  * Local Variables:
     229             :  * eval: (c-set-style "gnu")
     230             :  * End:
     231             :  */