drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c

   1 /*
   2  * drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
   3  * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
   4  * Copyright (c) 2017 Petr Machata <petrm@mellanox.com>
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. Neither the names of the copyright holders nor the names of its
  15  *    contributors may be used to endorse or promote products derived from
  16  *    this software without specific prior written permission.
  17  *
  18  * Alternatively, this software may be distributed under the terms of the
  19  * GNU General Public License ("GPL") version 2 as published by the Free
  20  * Software Foundation.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <net/ip_tunnels.h>
  36
  37 #include "spectrum_ipip.h"
  38
  39 struct ip_tunnel_parm
  40 mlxsw_sp_ipip_netdev_parms4(const struct net_device *ol_dev)
  41 {
  42         struct ip_tunnel *tun = netdev_priv(ol_dev);
  43
  44         return tun->parms;
  45 }
  46
  47 static bool mlxsw_sp_ipip_parms4_has_ikey(struct ip_tunnel_parm parms)
  48 {
  49         return !!(parms.i_flags & TUNNEL_KEY);
  50 }
  51
  52 static bool mlxsw_sp_ipip_parms4_has_okey(struct ip_tunnel_parm parms)
  53 {
  54         return !!(parms.o_flags & TUNNEL_KEY);
  55 }
  56
  57 static u32 mlxsw_sp_ipip_parms4_ikey(struct ip_tunnel_parm parms)
  58 {
  59         return mlxsw_sp_ipip_parms4_has_ikey(parms) ?
  60                 be32_to_cpu(parms.i_key) : 0;
  61 }
  62
  63 static u32 mlxsw_sp_ipip_parms4_okey(struct ip_tunnel_parm parms)
  64 {
  65         return mlxsw_sp_ipip_parms4_has_okey(parms) ?
  66                 be32_to_cpu(parms.o_key) : 0;
  67 }
  68
  69 static union mlxsw_sp_l3addr
  70 mlxsw_sp_ipip_parms4_saddr(struct ip_tunnel_parm parms)
  71 {
  72         return (union mlxsw_sp_l3addr) { .addr4 = parms.iph.saddr };
  73 }
  74
  75 static union mlxsw_sp_l3addr
  76 mlxsw_sp_ipip_parms4_daddr(struct ip_tunnel_parm parms)
  77 {
  78         return (union mlxsw_sp_l3addr) { .addr4 = parms.iph.daddr };
  79 }
  80
  81 union mlxsw_sp_l3addr
  82 mlxsw_sp_ipip_netdev_saddr(enum mlxsw_sp_l3proto proto,
  83                            const struct net_device *ol_dev)
  84 {
  85         struct ip_tunnel_parm parms4;
  86
  87         switch (proto) {
  88         case MLXSW_SP_L3_PROTO_IPV4:
  89                 parms4 = mlxsw_sp_ipip_netdev_parms4(ol_dev);
  90                 return mlxsw_sp_ipip_parms4_saddr(parms4);
  91         case MLXSW_SP_L3_PROTO_IPV6:
  92                 break;
  93         }
  94
  95         WARN_ON(1);
  96         return (union mlxsw_sp_l3addr) {0};
  97 }
  98
  99 static __be32 mlxsw_sp_ipip_netdev_daddr4(const struct net_device *ol_dev)
 100 {
 101
 102         struct ip_tunnel_parm parms4 = mlxsw_sp_ipip_netdev_parms4(ol_dev);
 103
 104         return mlxsw_sp_ipip_parms4_daddr(parms4).addr4;
 105 }
 106
 107 static union mlxsw_sp_l3addr
 108 mlxsw_sp_ipip_netdev_daddr(enum mlxsw_sp_l3proto proto,
 109                            const struct net_device *ol_dev)
 110 {
 111         struct ip_tunnel_parm parms4;
 112
 113         switch (proto) {
 114         case MLXSW_SP_L3_PROTO_IPV4:
 115                 parms4 = mlxsw_sp_ipip_netdev_parms4(ol_dev);
 116                 return mlxsw_sp_ipip_parms4_daddr(parms4);
 117         case MLXSW_SP_L3_PROTO_IPV6:
 118                 break;
 119         }
 120
 121         WARN_ON(1);
 122         return (union mlxsw_sp_l3addr) {0};
 123 }
 124
 125 static int
 126 mlxsw_sp_ipip_nexthop_update_gre4(struct mlxsw_sp *mlxsw_sp, u32 adj_index,
 127                                   struct mlxsw_sp_ipip_entry *ipip_entry)
 128 {
 129         u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb);
 130         __be32 daddr4 = mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev);
 131         char ratr_pl[MLXSW_REG_RATR_LEN];
 132
 133         mlxsw_reg_ratr_pack(ratr_pl, MLXSW_REG_RATR_OP_WRITE_WRITE_ENTRY,
 134                             true, MLXSW_REG_RATR_TYPE_IPIP,
 135                             adj_index, rif_index);
 136         mlxsw_reg_ratr_ipip4_entry_pack(ratr_pl, be32_to_cpu(daddr4));
 137
 138         return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ratr), ratr_pl);
 139 }
 140
 141 static int
 142 mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(struct mlxsw_sp *mlxsw_sp,
 143                                      u32 tunnel_index,
 144                                      struct mlxsw_sp_ipip_entry *ipip_entry)
 145 {
 146         u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb);
 147         char rtdp_pl[MLXSW_REG_RTDP_LEN];
 148         struct ip_tunnel_parm parms;
 149         unsigned int type_check;
 150         bool has_ikey;
 151         u32 daddr4;
 152         u32 ikey;
 153
 154         parms = mlxsw_sp_ipip_netdev_parms4(ipip_entry->ol_dev);
 155         has_ikey = mlxsw_sp_ipip_parms4_has_ikey(parms);
 156         ikey = mlxsw_sp_ipip_parms4_ikey(parms);
 157
 158         mlxsw_reg_rtdp_pack(rtdp_pl, MLXSW_REG_RTDP_TYPE_IPIP, tunnel_index);
 159
 160         type_check = has_ikey ?
 161                 MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE_KEY :
 162                 MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE;
 163
 164         /* Linux demuxes tunnels based on packet SIP (which must match tunnel
 165          * remote IP). Thus configure decap so that it filters out packets that
 166          * are not IPv4 or have the wrong SIP. IPIP_DECAP_ERROR trap is
 167          * generated for packets that fail this criterion. Linux then handles
 168          * such packets in slow path and generates ICMP destination unreachable.
 169          */
 170         daddr4 = be32_to_cpu(mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev));
 171         mlxsw_reg_rtdp_ipip4_pack(rtdp_pl, rif_index,
 172                                   MLXSW_REG_RTDP_IPIP_SIP_CHECK_FILTER_IPV4,
 173                                   type_check, has_ikey, daddr4, ikey);
 174
 175         return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rtdp), rtdp_pl);
 176 }
 177
 178 static int
 179 mlxsw_sp_ipip_fib_entry_op_gre4_ralue(struct mlxsw_sp *mlxsw_sp,
 180                                       u32 dip, u8 prefix_len, u16 ul_vr_id,
 181                                       enum mlxsw_reg_ralue_op op,
 182                                       u32 tunnel_index)
 183 {
 184         char ralue_pl[MLXSW_REG_RALUE_LEN];
 185
 186         mlxsw_reg_ralue_pack4(ralue_pl, MLXSW_REG_RALXX_PROTOCOL_IPV4, op,
 187                               ul_vr_id, prefix_len, dip);
 188         mlxsw_reg_ralue_act_ip2me_tun_pack(ralue_pl, tunnel_index);
 189         return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl);
 190 }
 191
 192 static int mlxsw_sp_ipip_fib_entry_op_gre4(struct mlxsw_sp *mlxsw_sp,
 193                                         struct mlxsw_sp_ipip_entry *ipip_entry,
 194                                         enum mlxsw_reg_ralue_op op,
 195                                         u32 tunnel_index)
 196 {
 197         u16 ul_vr_id = mlxsw_sp_ipip_lb_ul_vr_id(ipip_entry->ol_lb);
 198         __be32 dip;
 199         int err;
 200
 201         err = mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(mlxsw_sp, tunnel_index,
 202                                                    ipip_entry);
 203         if (err)
 204                 return err;
 205
 206         dip = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4,
 207                                          ipip_entry->ol_dev).addr4;
 208         return mlxsw_sp_ipip_fib_entry_op_gre4_ralue(mlxsw_sp, be32_to_cpu(dip),
 209                                                      32, ul_vr_id, op,
 210                                                      tunnel_index);
 211 }
 212
 213 static bool mlxsw_sp_ipip_tunnel_complete(enum mlxsw_sp_l3proto proto,
 214                                           const struct net_device *ol_dev)
 215 {
 216         union mlxsw_sp_l3addr saddr = mlxsw_sp_ipip_netdev_saddr(proto, ol_dev);
 217         union mlxsw_sp_l3addr daddr = mlxsw_sp_ipip_netdev_daddr(proto, ol_dev);
 218         union mlxsw_sp_l3addr naddr = {0};
 219
 220         /* Tunnels with unset local or remote address are valid in Linux and
 221          * used for lightweight tunnels (LWT) and Non-Broadcast Multi-Access
 222          * (NBMA) tunnels. In principle these can be offloaded, but the driver
 223          * currently doesn't support this. So punt.
 224          */
 225         return memcmp(&saddr, &naddr, sizeof(naddr)) &&
 226                memcmp(&daddr, &naddr, sizeof(naddr));
 227 }
 228
 229 static bool mlxsw_sp_ipip_can_offload_gre4(const struct mlxsw_sp *mlxsw_sp,
 230                                            const struct net_device *ol_dev,
 231                                            enum mlxsw_sp_l3proto ol_proto)
 232 {
 233         struct ip_tunnel *tunnel = netdev_priv(ol_dev);
 234         __be16 okflags = TUNNEL_KEY; /* We can't offload any other features. */
 235         bool inherit_ttl = tunnel->parms.iph.ttl == 0;
 236         bool inherit_tos = tunnel->parms.iph.tos & 0x1;
 237
 238         return (tunnel->parms.i_flags & ~okflags) == 0 &&
 239                (tunnel->parms.o_flags & ~okflags) == 0 &&
 240                inherit_ttl && inherit_tos &&
 241                mlxsw_sp_ipip_tunnel_complete(MLXSW_SP_L3_PROTO_IPV4, ol_dev);
 242 }
 243
 244 static struct mlxsw_sp_rif_ipip_lb_config
 245 mlxsw_sp_ipip_ol_loopback_config_gre4(struct mlxsw_sp *mlxsw_sp,
 246                                       const struct net_device *ol_dev)
 247 {
 248         struct ip_tunnel_parm parms = mlxsw_sp_ipip_netdev_parms4(ol_dev);
 249         enum mlxsw_reg_ritr_loopback_ipip_type lb_ipipt;
 250
 251         lb_ipipt = mlxsw_sp_ipip_parms4_has_okey(parms) ?
 252                 MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_KEY_IN_IP :
 253                 MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_IN_IP;
 254         return (struct mlxsw_sp_rif_ipip_lb_config){
 255                 .lb_ipipt = lb_ipipt,
 256                 .okey = mlxsw_sp_ipip_parms4_okey(parms),
 257                 .ul_protocol = MLXSW_SP_L3_PROTO_IPV4,
 258                 .saddr = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4,
 259                                                     ol_dev),
 260         };
 261 }
 262
 263 static int
 264 mlxsw_sp_ipip_ol_netdev_change_gre4(struct mlxsw_sp *mlxsw_sp,
 265                                     struct mlxsw_sp_ipip_entry *ipip_entry,
 266                                     struct netlink_ext_ack *extack)
 267 {
 268         union mlxsw_sp_l3addr old_saddr, new_saddr;
 269         union mlxsw_sp_l3addr old_daddr, new_daddr;
 270         struct ip_tunnel_parm new_parms;
 271         bool update_tunnel = false;
 272         bool update_decap = false;
 273         bool update_nhs = false;
 274         int err = 0;
 275
 276         new_parms = mlxsw_sp_ipip_netdev_parms4(ipip_entry->ol_dev);
 277
 278         new_saddr = mlxsw_sp_ipip_parms4_saddr(new_parms);
 279         old_saddr = mlxsw_sp_ipip_parms4_saddr(ipip_entry->parms4);
 280         new_daddr = mlxsw_sp_ipip_parms4_daddr(new_parms);
 281         old_daddr = mlxsw_sp_ipip_parms4_daddr(ipip_entry->parms4);
 282
 283         if (!mlxsw_sp_l3addr_eq(&new_saddr, &old_saddr)) {
 284                 u16 ul_tb_id = mlxsw_sp_ipip_dev_ul_tb_id(ipip_entry->ol_dev);
 285
 286                 /* Since the local address has changed, if there is another
 287                  * tunnel with a matching saddr, both need to be demoted.
 288                  */
 289                 if (mlxsw_sp_ipip_demote_tunnel_by_saddr(mlxsw_sp,
 290                                                          MLXSW_SP_L3_PROTO_IPV4,
 291                                                          new_saddr, ul_tb_id,
 292                                                          ipip_entry)) {
 293                         mlxsw_sp_ipip_entry_demote_tunnel(mlxsw_sp, ipip_entry);
 294                         return 0;
 295                 }
 296
 297                 update_tunnel = true;
 298         } else if ((mlxsw_sp_ipip_parms4_okey(ipip_entry->parms4) !=
 299                     mlxsw_sp_ipip_parms4_okey(new_parms)) ||
 300                    ipip_entry->parms4.link != new_parms.link) {
 301                 update_tunnel = true;
 302         } else if (!mlxsw_sp_l3addr_eq(&new_daddr, &old_daddr)) {
 303                 update_nhs = true;
 304         } else if (mlxsw_sp_ipip_parms4_ikey(ipip_entry->parms4) !=
 305                    mlxsw_sp_ipip_parms4_ikey(new_parms)) {
 306                 update_decap = true;
 307         }
 308
 309         if (update_tunnel)
 310                 err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry,
 311                                                           true, true, true,
 312                                                           extack);
 313         else if (update_nhs)
 314                 err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry,
 315                                                           false, false, true,
 316                                                           extack);
 317         else if (update_decap)
 318                 err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry,
 319                                                           false, false, false,
 320                                                           extack);
 321
 322         ipip_entry->parms4 = new_parms;
 323         return err;
 324 }
 325
 326 static const struct mlxsw_sp_ipip_ops mlxsw_sp_ipip_gre4_ops = {
 327         .dev_type = ARPHRD_IPGRE,
 328         .ul_proto = MLXSW_SP_L3_PROTO_IPV4,
 329         .nexthop_update = mlxsw_sp_ipip_nexthop_update_gre4,
 330         .fib_entry_op = mlxsw_sp_ipip_fib_entry_op_gre4,
 331         .can_offload = mlxsw_sp_ipip_can_offload_gre4,
 332         .ol_loopback_config = mlxsw_sp_ipip_ol_loopback_config_gre4,
 333         .ol_netdev_change = mlxsw_sp_ipip_ol_netdev_change_gre4,
 334 };
 335
 336 const struct mlxsw_sp_ipip_ops *mlxsw_sp_ipip_ops_arr[] = {
 337         [MLXSW_SP_IPIP_TYPE_GRE4] = &mlxsw_sp_ipip_gre4_ops,
 338 };