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 CHK_STRUCT_ROUTE_COMPAT(struct route_in6, ro_dst); 79 80 /* 81 * Gets real interface for the @rte. 82 * Returns rt_ifp for !IFF_LOOPBACK routers. 83 * Extracts "real" address interface from interface address 84 * loopback routes. 85 */ 86 static struct ifnet * 87 fib6_get_ifaifp(struct rtentry *rte) 88 { 89 struct ifnet *ifp; 90 struct sockaddr_dl *sdl; 91 92 ifp = rte->rt_ifp; 93 if ((ifp->if_flags & IFF_LOOPBACK) && 94 rte->rt_gateway->sa_family == AF_LINK) { 95 sdl = (struct sockaddr_dl *)rte->rt_gateway; 96 return (ifnet_byindex(sdl->sdl_index)); 97 } 98 99 return (ifp); 100 } 101 102 static void 103 fib6_rte_to_nh_basic(struct rtentry *rte, const struct in6_addr *dst, 104 uint32_t flags, struct nhop6_basic *pnh6) 105 { 106 struct sockaddr_in6 *gw; 107 108 /* Do explicit nexthop zero unless we're copying it */ 109 memset(pnh6, 0, sizeof(*pnh6)); 110 111 if ((flags & NHR_IFAIF) != 0) 112 pnh6->nh_ifp = fib6_get_ifaifp(rte); 113 else 114 pnh6->nh_ifp = rte->rt_ifp; 115 116 pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp)); 117 if (rte->rt_flags & RTF_GATEWAY) { 118 gw = (struct sockaddr_in6 *)rte->rt_gateway; 119 pnh6->nh_addr = gw->sin6_addr; 120 in6_clearscope(&pnh6->nh_addr); 121 } else 122 pnh6->nh_addr = *dst; 123 /* Set flags */ 124 pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags); 125 gw = (struct sockaddr_in6 *)rt_key(rte); 126 if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr)) 127 pnh6->nh_flags |= NHF_DEFAULT; 128 } 129 130 static void 131 fib6_rte_to_nh_extended(struct rtentry *rte, const struct in6_addr *dst, 132 uint32_t flags, struct nhop6_extended *pnh6) 133 { 134 struct sockaddr_in6 *gw; 135 136 /* Do explicit nexthop zero unless we're copying it */ 137 memset(pnh6, 0, sizeof(*pnh6)); 138 139 if ((flags & NHR_IFAIF) != 0) 140 pnh6->nh_ifp = fib6_get_ifaifp(rte); 141 else 142 pnh6->nh_ifp = rte->rt_ifp; 143 144 pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp)); 145 if (rte->rt_flags & RTF_GATEWAY) { 146 gw = (struct sockaddr_in6 *)rte->rt_gateway; 147 pnh6->nh_addr = gw->sin6_addr; 148 in6_clearscope(&pnh6->nh_addr); 149 } else 150 pnh6->nh_addr = *dst; 151 /* Set flags */ 152 pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags); 153 gw = (struct sockaddr_in6 *)rt_key(rte); 154 if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr)) 155 pnh6->nh_flags |= NHF_DEFAULT; 156 } 157 158 /* 159 * Performs IPv6 route table lookup on @dst. Returns 0 on success. 160 * Stores basic nexthop info into provided @pnh6 structure. 161 * Note that 162 * - nh_ifp represents logical transmit interface (rt_ifp) by default 163 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed 164 * - mtu from logical transmit interface will be returned. 165 * - nh_ifp cannot be safely dereferenced 166 * - nh_ifp represents rt_ifp (e.g. if looking up address on 167 * interface "ix0" pointer to "ix0" interface will be returned instead 168 * of "lo0") 169 * - howewer mtu from "transmit" interface will be returned. 170 * - scope will be embedded in nh_addr 171 */ 172 int 173 fib6_lookup_nh_basic(uint32_t fibnum, const struct in6_addr *dst, uint32_t scopeid, 174 uint32_t flags, uint32_t flowid, struct nhop6_basic *pnh6) 175 { 176 RIB_RLOCK_TRACKER; 177 struct rib_head *rh; 178 struct radix_node *rn; 179 struct sockaddr_in6 sin6; 180 struct rtentry *rte; 181 182 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_basic: bad fibnum")); 183 rh = rt_tables_get_rnh(fibnum, AF_INET6); 184 if (rh == NULL) 185 return (ENOENT); 186 187 /* Prepare lookup key */ 188 memset(&sin6, 0, sizeof(sin6)); 189 sin6.sin6_addr = *dst; 190 sin6.sin6_len = sizeof(struct sockaddr_in6); 191 /* Assume scopeid is valid and embed it directly */ 192 if (IN6_IS_SCOPE_LINKLOCAL(dst)) 193 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); 194 195 RIB_RLOCK(rh); 196 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); 197 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 198 rte = RNTORT(rn); 199 /* Ensure route & ifp is UP */ 200 if (RT_LINK_IS_UP(rte->rt_ifp)) { 201 fib6_rte_to_nh_basic(rte, &sin6.sin6_addr, flags, pnh6); 202 RIB_RUNLOCK(rh); 203 return (0); 204 } 205 } 206 RIB_RUNLOCK(rh); 207 208 return (ENOENT); 209 } 210 211 /* 212 * Performs IPv6 route table lookup on @dst. Returns 0 on success. 213 * Stores extended nexthop info into provided @pnh6 structure. 214 * Note that 215 * - nh_ifp cannot be safely dereferenced unless NHR_REF is specified. 216 * - in that case you need to call fib6_free_nh_ext() 217 * - nh_ifp represents logical transmit interface (rt_ifp) by default 218 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed 219 * - mtu from logical transmit interface will be returned. 220 * - scope will be embedded in nh_addr 221 */ 222 int 223 fib6_lookup_nh_ext(uint32_t fibnum, const struct in6_addr *dst,uint32_t scopeid, 224 uint32_t flags, uint32_t flowid, struct nhop6_extended *pnh6) 225 { 226 RIB_RLOCK_TRACKER; 227 struct rib_head *rh; 228 struct radix_node *rn; 229 struct sockaddr_in6 sin6; 230 struct rtentry *rte; 231 232 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_ext: bad fibnum")); 233 rh = rt_tables_get_rnh(fibnum, AF_INET6); 234 if (rh == NULL) 235 return (ENOENT); 236 237 /* Prepare lookup key */ 238 memset(&sin6, 0, sizeof(sin6)); 239 sin6.sin6_len = sizeof(struct sockaddr_in6); 240 sin6.sin6_addr = *dst; 241 /* Assume scopeid is valid and embed it directly */ 242 if (IN6_IS_SCOPE_LINKLOCAL(dst)) 243 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); 244 245 RIB_RLOCK(rh); 246 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); 247 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 248 rte = RNTORT(rn); 249 #ifdef RADIX_MPATH 250 rte = rt_mpath_select(rte, flowid); 251 if (rte == NULL) { 252 RIB_RUNLOCK(rh); 253 return (ENOENT); 254 } 255 #endif 256 /* Ensure route & ifp is UP */ 257 if (RT_LINK_IS_UP(rte->rt_ifp)) { 258 fib6_rte_to_nh_extended(rte, &sin6.sin6_addr, flags, 259 pnh6); 260 if ((flags & NHR_REF) != 0) { 261 /* TODO: Do lwref on egress ifp's */ 262 } 263 RIB_RUNLOCK(rh); 264 265 return (0); 266 } 267 } 268 RIB_RUNLOCK(rh); 269 270 return (ENOENT); 271 } 272 273 void 274 fib6_free_nh_ext(uint32_t fibnum, struct nhop6_extended *pnh6) 275 { 276 277 } 278 279 #endif 280 281