1 /*- 2 * Copyright (c) 2015 3 * Alexander V. Chernikov <melifaro@FreeBSD.org> 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 #include "opt_route.h" 36 #include "opt_mpath.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/lock.h> 41 #include <sys/rmlock.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/socket.h> 45 #include <sys/sysctl.h> 46 #include <sys/kernel.h> 47 48 #include <net/if.h> 49 #include <net/if_var.h> 50 #include <net/if_dl.h> 51 #include <net/route.h> 52 #include <net/route_var.h> 53 #include <net/vnet.h> 54 55 #ifdef RADIX_MPATH 56 #include <net/radix_mpath.h> 57 #endif 58 59 #include <netinet/in.h> 60 #include <netinet/in_var.h> 61 #include <netinet/ip_mroute.h> 62 #include <netinet/ip6.h> 63 #include <netinet6/in6_fib.h> 64 #include <netinet6/in6_var.h> 65 #include <netinet6/nd6.h> 66 #include <netinet6/scope6_var.h> 67 68 #include <net/if_types.h> 69 70 #ifdef INET6 71 static void fib6_rte_to_nh_extended(struct rtentry *rte, 72 const struct in6_addr *dst, uint32_t flags, struct nhop6_extended *pnh6); 73 static void fib6_rte_to_nh_basic(struct rtentry *rte, const struct in6_addr *dst, 74 uint32_t flags, struct nhop6_basic *pnh6); 75 static struct ifnet *fib6_get_ifaifp(struct rtentry *rte); 76 #define RNTORT(p) ((struct rtentry *)(p)) 77 78 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 79 80 CHK_STRUCT_ROUTE_COMPAT(struct route_in6, ro_dst); 81 82 /* 83 * Gets real interface for the @rte. 84 * Returns rt_ifp for !IFF_LOOPBACK routers. 85 * Extracts "real" address interface from interface address 86 * loopback routes. 87 */ 88 static struct ifnet * 89 fib6_get_ifaifp(struct rtentry *rte) 90 { 91 struct ifnet *ifp; 92 struct sockaddr_dl *sdl; 93 94 ifp = rte->rt_ifp; 95 if ((ifp->if_flags & IFF_LOOPBACK) && 96 rte->rt_gateway->sa_family == AF_LINK) { 97 sdl = (struct sockaddr_dl *)rte->rt_gateway; 98 return (ifnet_byindex(sdl->sdl_index)); 99 } 100 101 return (ifp); 102 } 103 104 static void 105 fib6_rte_to_nh_basic(struct rtentry *rte, const struct in6_addr *dst, 106 uint32_t flags, struct nhop6_basic *pnh6) 107 { 108 struct sockaddr_in6 *gw; 109 110 /* Do explicit nexthop zero unless we're copying it */ 111 memset(pnh6, 0, sizeof(*pnh6)); 112 113 if ((flags & NHR_IFAIF) != 0) 114 pnh6->nh_ifp = fib6_get_ifaifp(rte); 115 else 116 pnh6->nh_ifp = rte->rt_ifp; 117 118 pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp)); 119 if (rte->rt_flags & RTF_GATEWAY) { 120 /* Return address with embedded scope. */ 121 gw = (struct sockaddr_in6 *)rte->rt_gateway; 122 pnh6->nh_addr = gw->sin6_addr; 123 } else 124 pnh6->nh_addr = *dst; 125 /* Set flags */ 126 pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags); 127 gw = (struct sockaddr_in6 *)rt_key(rte); 128 if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr)) 129 pnh6->nh_flags |= NHF_DEFAULT; 130 } 131 132 static void 133 fib6_rte_to_nh_extended(struct rtentry *rte, const struct in6_addr *dst, 134 uint32_t flags, struct nhop6_extended *pnh6) 135 { 136 struct sockaddr_in6 *gw; 137 138 /* Do explicit nexthop zero unless we're copying it */ 139 memset(pnh6, 0, sizeof(*pnh6)); 140 141 if ((flags & NHR_IFAIF) != 0) 142 pnh6->nh_ifp = fib6_get_ifaifp(rte); 143 else 144 pnh6->nh_ifp = rte->rt_ifp; 145 146 pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp)); 147 if (rte->rt_flags & RTF_GATEWAY) { 148 /* Return address with embedded scope. */ 149 gw = (struct sockaddr_in6 *)rte->rt_gateway; 150 pnh6->nh_addr = gw->sin6_addr; 151 } else 152 pnh6->nh_addr = *dst; 153 /* Set flags */ 154 pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags); 155 gw = (struct sockaddr_in6 *)rt_key(rte); 156 if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr)) 157 pnh6->nh_flags |= NHF_DEFAULT; 158 pnh6->nh_ia = ifatoia6(rte->rt_ifa); 159 } 160 161 /* 162 * Performs IPv6 route table lookup on @dst. Returns 0 on success. 163 * Stores basic nexthop info into provided @pnh6 structure. 164 * Note that 165 * - nh_ifp represents logical transmit interface (rt_ifp) by default 166 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed 167 * - mtu from logical transmit interface will be returned. 168 * - nh_ifp cannot be safely dereferenced 169 * - nh_ifp represents rt_ifp (e.g. if looking up address on 170 * interface "ix0" pointer to "ix0" interface will be returned instead 171 * of "lo0") 172 * - howewer mtu from "transmit" interface will be returned. 173 * - scope will be embedded in nh_addr 174 */ 175 int 176 fib6_lookup_nh_basic(uint32_t fibnum, const struct in6_addr *dst, uint32_t scopeid, 177 uint32_t flags, uint32_t flowid, struct nhop6_basic *pnh6) 178 { 179 RIB_RLOCK_TRACKER; 180 struct rib_head *rh; 181 struct radix_node *rn; 182 struct sockaddr_in6 sin6; 183 struct rtentry *rte; 184 185 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_basic: bad fibnum")); 186 rh = rt_tables_get_rnh(fibnum, AF_INET6); 187 if (rh == NULL) 188 return (ENOENT); 189 190 /* Prepare lookup key */ 191 memset(&sin6, 0, sizeof(sin6)); 192 sin6.sin6_addr = *dst; 193 sin6.sin6_len = sizeof(struct sockaddr_in6); 194 /* Assume scopeid is valid and embed it directly */ 195 if (IN6_IS_SCOPE_LINKLOCAL(dst)) 196 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); 197 198 RIB_RLOCK(rh); 199 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); 200 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 201 rte = RNTORT(rn); 202 /* Ensure route & ifp is UP */ 203 if (RT_LINK_IS_UP(rte->rt_ifp)) { 204 fib6_rte_to_nh_basic(rte, &sin6.sin6_addr, flags, pnh6); 205 RIB_RUNLOCK(rh); 206 return (0); 207 } 208 } 209 RIB_RUNLOCK(rh); 210 211 return (ENOENT); 212 } 213 214 /* 215 * Performs IPv6 route table lookup on @dst. Returns 0 on success. 216 * Stores extended nexthop info into provided @pnh6 structure. 217 * Note that 218 * - nh_ifp cannot be safely dereferenced unless NHR_REF is specified. 219 * - in that case you need to call fib6_free_nh_ext() 220 * - nh_ifp represents logical transmit interface (rt_ifp) by default 221 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed 222 * - mtu from logical transmit interface will be returned. 223 * - scope will be embedded in nh_addr 224 */ 225 int 226 fib6_lookup_nh_ext(uint32_t fibnum, const struct in6_addr *dst,uint32_t scopeid, 227 uint32_t flags, uint32_t flowid, struct nhop6_extended *pnh6) 228 { 229 RIB_RLOCK_TRACKER; 230 struct rib_head *rh; 231 struct radix_node *rn; 232 struct sockaddr_in6 sin6; 233 struct rtentry *rte; 234 235 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_ext: bad fibnum")); 236 rh = rt_tables_get_rnh(fibnum, AF_INET6); 237 if (rh == NULL) 238 return (ENOENT); 239 240 /* Prepare lookup key */ 241 memset(&sin6, 0, sizeof(sin6)); 242 sin6.sin6_len = sizeof(struct sockaddr_in6); 243 sin6.sin6_addr = *dst; 244 /* Assume scopeid is valid and embed it directly */ 245 if (IN6_IS_SCOPE_LINKLOCAL(dst)) 246 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); 247 248 RIB_RLOCK(rh); 249 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); 250 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 251 rte = RNTORT(rn); 252 #ifdef RADIX_MPATH 253 rte = rt_mpath_select(rte, flowid); 254 if (rte == NULL) { 255 RIB_RUNLOCK(rh); 256 return (ENOENT); 257 } 258 #endif 259 /* Ensure route & ifp is UP */ 260 if (RT_LINK_IS_UP(rte->rt_ifp)) { 261 fib6_rte_to_nh_extended(rte, &sin6.sin6_addr, flags, 262 pnh6); 263 if ((flags & NHR_REF) != 0) { 264 /* TODO: Do lwref on egress ifp's */ 265 } 266 RIB_RUNLOCK(rh); 267 268 return (0); 269 } 270 } 271 RIB_RUNLOCK(rh); 272 273 return (ENOENT); 274 } 275 276 void 277 fib6_free_nh_ext(uint32_t fibnum, struct nhop6_extended *pnh6) 278 { 279 280 } 281 282 #endif 283 284