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_parms(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_parms_has_ikey(struct ip_tunnel_parm parms) 48 { 49 return !!(parms.i_flags & TUNNEL_KEY); 50 } 51 52 static bool mlxsw_sp_ipip_parms_has_okey(struct ip_tunnel_parm parms) 53 { 54 return !!(parms.o_flags & TUNNEL_KEY); 55 } 56 57 static u32 mlxsw_sp_ipip_parms_ikey(struct ip_tunnel_parm parms) 58 { 59 return mlxsw_sp_ipip_parms_has_ikey(parms) ? 60 be32_to_cpu(parms.i_key) : 0; 61 } 62 63 static u32 mlxsw_sp_ipip_parms_okey(struct ip_tunnel_parm parms) 64 { 65 return mlxsw_sp_ipip_parms_has_okey(parms) ? 66 be32_to_cpu(parms.o_key) : 0; 67 } 68 69 static __be32 mlxsw_sp_ipip_parms_saddr4(struct ip_tunnel_parm parms) 70 { 71 return parms.iph.saddr; 72 } 73 74 static union mlxsw_sp_l3addr 75 mlxsw_sp_ipip_parms_saddr(enum mlxsw_sp_l3proto proto, 76 struct ip_tunnel_parm parms) 77 { 78 switch (proto) { 79 case MLXSW_SP_L3_PROTO_IPV4: 80 return (union mlxsw_sp_l3addr) { 81 .addr4 = mlxsw_sp_ipip_parms_saddr4(parms), 82 }; 83 case MLXSW_SP_L3_PROTO_IPV6: 84 break; 85 } 86 87 WARN_ON(1); 88 return (union mlxsw_sp_l3addr) { 89 .addr4 = 0, 90 }; 91 } 92 93 static __be32 mlxsw_sp_ipip_parms_daddr4(struct ip_tunnel_parm parms) 94 { 95 return parms.iph.daddr; 96 } 97 98 static union mlxsw_sp_l3addr 99 mlxsw_sp_ipip_parms_daddr(enum mlxsw_sp_l3proto proto, 100 struct ip_tunnel_parm parms) 101 { 102 switch (proto) { 103 case MLXSW_SP_L3_PROTO_IPV4: 104 return (union mlxsw_sp_l3addr) { 105 .addr4 = mlxsw_sp_ipip_parms_daddr4(parms), 106 }; 107 case MLXSW_SP_L3_PROTO_IPV6: 108 break; 109 } 110 111 WARN_ON(1); 112 return (union mlxsw_sp_l3addr) { 113 .addr4 = 0, 114 }; 115 } 116 117 static bool mlxsw_sp_ipip_netdev_has_ikey(const struct net_device *ol_dev) 118 { 119 return mlxsw_sp_ipip_parms_has_ikey(mlxsw_sp_ipip_netdev_parms(ol_dev)); 120 } 121 122 static bool mlxsw_sp_ipip_netdev_has_okey(const struct net_device *ol_dev) 123 { 124 return mlxsw_sp_ipip_parms_has_okey(mlxsw_sp_ipip_netdev_parms(ol_dev)); 125 } 126 127 static u32 mlxsw_sp_ipip_netdev_ikey(const struct net_device *ol_dev) 128 { 129 return mlxsw_sp_ipip_parms_ikey(mlxsw_sp_ipip_netdev_parms(ol_dev)); 130 } 131 132 static u32 mlxsw_sp_ipip_netdev_okey(const struct net_device *ol_dev) 133 { 134 return mlxsw_sp_ipip_parms_okey(mlxsw_sp_ipip_netdev_parms(ol_dev)); 135 } 136 137 union mlxsw_sp_l3addr 138 mlxsw_sp_ipip_netdev_saddr(enum mlxsw_sp_l3proto proto, 139 const struct net_device *ol_dev) 140 { 141 return mlxsw_sp_ipip_parms_saddr(proto, 142 mlxsw_sp_ipip_netdev_parms(ol_dev)); 143 } 144 145 static __be32 mlxsw_sp_ipip_netdev_daddr4(const struct net_device *ol_dev) 146 { 147 return mlxsw_sp_ipip_parms_daddr4(mlxsw_sp_ipip_netdev_parms(ol_dev)); 148 } 149 150 static union mlxsw_sp_l3addr 151 mlxsw_sp_ipip_netdev_daddr(enum mlxsw_sp_l3proto proto, 152 const struct net_device *ol_dev) 153 { 154 return mlxsw_sp_ipip_parms_daddr(proto, 155 mlxsw_sp_ipip_netdev_parms(ol_dev)); 156 } 157 158 static int 159 mlxsw_sp_ipip_nexthop_update_gre4(struct mlxsw_sp *mlxsw_sp, u32 adj_index, 160 struct mlxsw_sp_ipip_entry *ipip_entry) 161 { 162 u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb); 163 __be32 daddr4 = mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev); 164 char ratr_pl[MLXSW_REG_RATR_LEN]; 165 166 mlxsw_reg_ratr_pack(ratr_pl, MLXSW_REG_RATR_OP_WRITE_WRITE_ENTRY, 167 true, MLXSW_REG_RATR_TYPE_IPIP, 168 adj_index, rif_index); 169 mlxsw_reg_ratr_ipip4_entry_pack(ratr_pl, be32_to_cpu(daddr4)); 170 171 return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ratr), ratr_pl); 172 } 173 174 static int 175 mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(struct mlxsw_sp *mlxsw_sp, 176 u32 tunnel_index, 177 struct mlxsw_sp_ipip_entry *ipip_entry) 178 { 179 bool has_ikey = mlxsw_sp_ipip_netdev_has_ikey(ipip_entry->ol_dev); 180 u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb); 181 u32 ikey = mlxsw_sp_ipip_netdev_ikey(ipip_entry->ol_dev); 182 char rtdp_pl[MLXSW_REG_RTDP_LEN]; 183 unsigned int type_check; 184 u32 daddr4; 185 186 mlxsw_reg_rtdp_pack(rtdp_pl, MLXSW_REG_RTDP_TYPE_IPIP, tunnel_index); 187 188 type_check = has_ikey ? 189 MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE_KEY : 190 MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE; 191 192 /* Linux demuxes tunnels based on packet SIP (which must match tunnel 193 * remote IP). Thus configure decap so that it filters out packets that 194 * are not IPv4 or have the wrong SIP. IPIP_DECAP_ERROR trap is 195 * generated for packets that fail this criterion. Linux then handles 196 * such packets in slow path and generates ICMP destination unreachable. 197 */ 198 daddr4 = be32_to_cpu(mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev)); 199 mlxsw_reg_rtdp_ipip4_pack(rtdp_pl, rif_index, 200 MLXSW_REG_RTDP_IPIP_SIP_CHECK_FILTER_IPV4, 201 type_check, has_ikey, daddr4, ikey); 202 203 return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rtdp), rtdp_pl); 204 } 205 206 static int 207 mlxsw_sp_ipip_fib_entry_op_gre4_ralue(struct mlxsw_sp *mlxsw_sp, 208 u32 dip, u8 prefix_len, u16 ul_vr_id, 209 enum mlxsw_reg_ralue_op op, 210 u32 tunnel_index) 211 { 212 char ralue_pl[MLXSW_REG_RALUE_LEN]; 213 214 mlxsw_reg_ralue_pack4(ralue_pl, MLXSW_REG_RALXX_PROTOCOL_IPV4, op, 215 ul_vr_id, prefix_len, dip); 216 mlxsw_reg_ralue_act_ip2me_tun_pack(ralue_pl, tunnel_index); 217 return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl); 218 } 219 220 static int mlxsw_sp_ipip_fib_entry_op_gre4(struct mlxsw_sp *mlxsw_sp, 221 struct mlxsw_sp_ipip_entry *ipip_entry, 222 enum mlxsw_reg_ralue_op op, 223 u32 tunnel_index) 224 { 225 u16 ul_vr_id = mlxsw_sp_ipip_lb_ul_vr_id(ipip_entry->ol_lb); 226 __be32 dip; 227 int err; 228 229 err = mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(mlxsw_sp, tunnel_index, 230 ipip_entry); 231 if (err) 232 return err; 233 234 dip = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4, 235 ipip_entry->ol_dev).addr4; 236 return mlxsw_sp_ipip_fib_entry_op_gre4_ralue(mlxsw_sp, be32_to_cpu(dip), 237 32, ul_vr_id, op, 238 tunnel_index); 239 } 240 241 static bool mlxsw_sp_ipip_tunnel_complete(enum mlxsw_sp_l3proto proto, 242 const struct net_device *ol_dev) 243 { 244 union mlxsw_sp_l3addr saddr = mlxsw_sp_ipip_netdev_saddr(proto, ol_dev); 245 union mlxsw_sp_l3addr daddr = mlxsw_sp_ipip_netdev_daddr(proto, ol_dev); 246 union mlxsw_sp_l3addr naddr = {0}; 247 248 /* Tunnels with unset local or remote address are valid in Linux and 249 * used for lightweight tunnels (LWT) and Non-Broadcast Multi-Access 250 * (NBMA) tunnels. In principle these can be offloaded, but the driver 251 * currently doesn't support this. So punt. 252 */ 253 return memcmp(&saddr, &naddr, sizeof(naddr)) && 254 memcmp(&daddr, &naddr, sizeof(naddr)); 255 } 256 257 static bool mlxsw_sp_ipip_can_offload_gre4(const struct mlxsw_sp *mlxsw_sp, 258 const struct net_device *ol_dev, 259 enum mlxsw_sp_l3proto ol_proto) 260 { 261 struct ip_tunnel *tunnel = netdev_priv(ol_dev); 262 __be16 okflags = TUNNEL_KEY; /* We can't offload any other features. */ 263 bool inherit_ttl = tunnel->parms.iph.ttl == 0; 264 bool inherit_tos = tunnel->parms.iph.tos & 0x1; 265 266 return (tunnel->parms.i_flags & ~okflags) == 0 && 267 (tunnel->parms.o_flags & ~okflags) == 0 && 268 inherit_ttl && inherit_tos && 269 mlxsw_sp_ipip_tunnel_complete(MLXSW_SP_L3_PROTO_IPV4, ol_dev); 270 } 271 272 static struct mlxsw_sp_rif_ipip_lb_config 273 mlxsw_sp_ipip_ol_loopback_config_gre4(struct mlxsw_sp *mlxsw_sp, 274 const struct net_device *ol_dev) 275 { 276 enum mlxsw_reg_ritr_loopback_ipip_type lb_ipipt; 277 278 lb_ipipt = mlxsw_sp_ipip_netdev_has_okey(ol_dev) ? 279 MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_KEY_IN_IP : 280 MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_IN_IP; 281 return (struct mlxsw_sp_rif_ipip_lb_config){ 282 .lb_ipipt = lb_ipipt, 283 .okey = mlxsw_sp_ipip_netdev_okey(ol_dev), 284 .ul_protocol = MLXSW_SP_L3_PROTO_IPV4, 285 .saddr = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4, 286 ol_dev), 287 }; 288 } 289 290 static int 291 mlxsw_sp_ipip_ol_netdev_change_gre4(struct mlxsw_sp *mlxsw_sp, 292 struct mlxsw_sp_ipip_entry *ipip_entry, 293 struct netlink_ext_ack *extack) 294 { 295 union mlxsw_sp_l3addr old_saddr, new_saddr; 296 union mlxsw_sp_l3addr old_daddr, new_daddr; 297 struct ip_tunnel_parm new_parms; 298 bool update_tunnel = false; 299 bool update_decap = false; 300 bool update_nhs = false; 301 int err = 0; 302 303 new_parms = mlxsw_sp_ipip_netdev_parms(ipip_entry->ol_dev); 304 305 new_saddr = mlxsw_sp_ipip_parms_saddr(MLXSW_SP_L3_PROTO_IPV4, 306 new_parms); 307 old_saddr = mlxsw_sp_ipip_parms_saddr(MLXSW_SP_L3_PROTO_IPV4, 308 ipip_entry->parms); 309 new_daddr = mlxsw_sp_ipip_parms_daddr(MLXSW_SP_L3_PROTO_IPV4, 310 new_parms); 311 old_daddr = mlxsw_sp_ipip_parms_daddr(MLXSW_SP_L3_PROTO_IPV4, 312 ipip_entry->parms); 313 314 if (!mlxsw_sp_l3addr_eq(&new_saddr, &old_saddr)) { 315 u16 ul_tb_id = mlxsw_sp_ipip_dev_ul_tb_id(ipip_entry->ol_dev); 316 317 /* Since the local address has changed, if there is another 318 * tunnel with a matching saddr, both need to be demoted. 319 */ 320 if (mlxsw_sp_ipip_demote_tunnel_by_saddr(mlxsw_sp, 321 MLXSW_SP_L3_PROTO_IPV4, 322 new_saddr, ul_tb_id, 323 ipip_entry)) { 324 mlxsw_sp_ipip_entry_demote_tunnel(mlxsw_sp, ipip_entry); 325 return 0; 326 } 327 328 update_tunnel = true; 329 } else if ((mlxsw_sp_ipip_parms_okey(ipip_entry->parms) != 330 mlxsw_sp_ipip_parms_okey(new_parms)) || 331 ipip_entry->parms.link != new_parms.link) { 332 update_tunnel = true; 333 } else if (!mlxsw_sp_l3addr_eq(&new_daddr, &old_daddr)) { 334 update_nhs = true; 335 } else if (mlxsw_sp_ipip_parms_ikey(ipip_entry->parms) != 336 mlxsw_sp_ipip_parms_ikey(new_parms)) { 337 update_decap = true; 338 } 339 340 if (update_tunnel) 341 err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry, 342 true, true, true, 343 extack); 344 else if (update_nhs) 345 err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry, 346 false, false, true, 347 extack); 348 else if (update_decap) 349 err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry, 350 false, false, false, 351 extack); 352 353 ipip_entry->parms = new_parms; 354 return err; 355 } 356 357 static const struct mlxsw_sp_ipip_ops mlxsw_sp_ipip_gre4_ops = { 358 .dev_type = ARPHRD_IPGRE, 359 .ul_proto = MLXSW_SP_L3_PROTO_IPV4, 360 .nexthop_update = mlxsw_sp_ipip_nexthop_update_gre4, 361 .fib_entry_op = mlxsw_sp_ipip_fib_entry_op_gre4, 362 .can_offload = mlxsw_sp_ipip_can_offload_gre4, 363 .ol_loopback_config = mlxsw_sp_ipip_ol_loopback_config_gre4, 364 .ol_netdev_change = mlxsw_sp_ipip_ol_netdev_change_gre4, 365 }; 366 367 const struct mlxsw_sp_ipip_ops *mlxsw_sp_ipip_ops_arr[] = { 368 [MLXSW_SP_IPIP_TYPE_GRE4] = &mlxsw_sp_ipip_gre4_ops, 369 }; 370