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/route_var.h> 53 #include <net/route/nhop.h> 54 #include <net/route/shared.h> 55 #include <net/vnet.h> 56 57 #ifdef RADIX_MPATH 58 #include <net/radix_mpath.h> 59 #endif 60 61 #include <netinet/in.h> 62 #include <netinet/in_var.h> 63 #include <netinet/ip_mroute.h> 64 #include <netinet/ip6.h> 65 #include <netinet6/in6_fib.h> 66 #include <netinet6/in6_var.h> 67 #include <netinet6/nd6.h> 68 #include <netinet6/scope6_var.h> 69 70 #include <net/if_types.h> 71 72 #ifdef INET6 73 74 CHK_STRUCT_ROUTE_COMPAT(struct route_in6, ro_dst); 75 76 /* 77 * Looks up path in fib @fibnum specified by @dst. 78 * Assumes scope is deembedded and provided in @scopeid. 79 * 80 * Returns path nexthop on success. Nexthop is safe to use 81 * within the current network epoch. If longer lifetime is required, 82 * one needs to pass NHR_REF as a flag. This will return referenced 83 * nexthop. 84 */ 85 struct nhop_object * 86 fib6_lookup(uint32_t fibnum, const struct in6_addr *dst6, 87 uint32_t scopeid, uint32_t flags, uint32_t flowid) 88 { 89 RIB_RLOCK_TRACKER; 90 struct rib_head *rh; 91 struct radix_node *rn; 92 struct rtentry *rt; 93 struct nhop_object *nh; 94 struct sockaddr_in6 sin6; 95 96 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum")); 97 rh = rt_tables_get_rnh(fibnum, AF_INET6); 98 if (rh == NULL) 99 return (NULL); 100 101 /* TODO: radix changes */ 102 //addr = *dst6; 103 /* Prepare lookup key */ 104 memset(&sin6, 0, sizeof(sin6)); 105 sin6.sin6_len = sizeof(struct sockaddr_in6); 106 sin6.sin6_addr = *dst6; 107 108 /* Assume scopeid is valid and embed it directly */ 109 if (IN6_IS_SCOPE_LINKLOCAL(dst6)) 110 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); 111 112 RIB_RLOCK(rh); 113 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); 114 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 115 rt = RNTORT(rn); 116 #ifdef RADIX_MPATH 117 if (rt_mpath_next(rt) != NULL) 118 rt = rt_mpath_selectrte(rt, flowid); 119 #endif 120 nh = rt->rt_nhop; 121 /* Ensure route & ifp is UP */ 122 if (RT_LINK_IS_UP(nh->nh_ifp)) { 123 if (flags & NHR_REF) 124 nhop_ref_object(nh); 125 RIB_RUNLOCK(rh); 126 return (nh); 127 } 128 } 129 RIB_RUNLOCK(rh); 130 131 RTSTAT_INC(rts_unreach); 132 return (NULL); 133 } 134 135 inline static int 136 check_urpf(const struct nhop_object *nh, uint32_t flags, 137 const struct ifnet *src_if) 138 { 139 140 if (src_if != NULL && nh->nh_aifp == src_if) { 141 return (1); 142 } 143 if (src_if == NULL) { 144 if ((flags & NHR_NODEFAULT) == 0) 145 return (1); 146 else if ((nh->nh_flags & NHF_DEFAULT) == 0) 147 return (1); 148 } 149 150 return (0); 151 } 152 153 #ifdef RADIX_MPATH 154 inline static int 155 check_urpf_mpath(struct rtentry *rt, uint32_t flags, 156 const struct ifnet *src_if) 157 { 158 159 while (rt != NULL) { 160 if (check_urpf(rt->rt_nhop, flags, src_if) != 0) 161 return (1); 162 rt = rt_mpath_next(rt); 163 } 164 165 return (0); 166 } 167 #endif 168 169 /* 170 * Performs reverse path forwarding lookup. 171 * If @src_if is non-zero, verifies that at least 1 path goes via 172 * this interface. 173 * If @src_if is zero, verifies that route exist. 174 * if @flags contains NHR_NOTDEFAULT, do not consider default route. 175 * 176 * Returns 1 if route matching conditions is found, 0 otherwise. 177 */ 178 int 179 fib6_check_urpf(uint32_t fibnum, const struct in6_addr *dst6, 180 uint32_t scopeid, uint32_t flags, const struct ifnet *src_if) 181 { 182 RIB_RLOCK_TRACKER; 183 struct rib_head *rh; 184 struct radix_node *rn; 185 struct rtentry *rt; 186 struct sockaddr_in6 sin6; 187 int ret; 188 189 KASSERT((fibnum < rt_numfibs), ("fib6_check_urpf: bad fibnum")); 190 rh = rt_tables_get_rnh(fibnum, AF_INET6); 191 if (rh == NULL) 192 return (0); 193 194 /* TODO: radix changes */ 195 /* Prepare lookup key */ 196 memset(&sin6, 0, sizeof(sin6)); 197 sin6.sin6_len = sizeof(struct sockaddr_in6); 198 sin6.sin6_addr = *dst6; 199 200 /* Assume scopeid is valid and embed it directly */ 201 if (IN6_IS_SCOPE_LINKLOCAL(dst6)) 202 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); 203 204 RIB_RLOCK(rh); 205 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); 206 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 207 rt = RNTORT(rn); 208 #ifdef RADIX_MPATH 209 ret = check_urpf_mpath(rt, flags, src_if); 210 #else 211 ret = check_urpf(rt->rt_nhop, flags, src_if); 212 #endif 213 RIB_RUNLOCK(rh); 214 return (ret); 215 } 216 RIB_RUNLOCK(rh); 217 218 return (0); 219 } 220 221 struct nhop_object * 222 fib6_lookup_debugnet(uint32_t fibnum, const struct in6_addr *dst6, 223 uint32_t scopeid, uint32_t flags) 224 { 225 struct rib_head *rh; 226 struct radix_node *rn; 227 struct rtentry *rt; 228 struct nhop_object *nh; 229 struct sockaddr_in6 sin6; 230 231 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum")); 232 rh = rt_tables_get_rnh(fibnum, AF_INET6); 233 if (rh == NULL) 234 return (NULL); 235 236 /* TODO: radix changes */ 237 //addr = *dst6; 238 /* Prepare lookup key */ 239 memset(&sin6, 0, sizeof(sin6)); 240 sin6.sin6_len = sizeof(struct sockaddr_in6); 241 sin6.sin6_addr = *dst6; 242 243 /* Assume scopeid is valid and embed it directly */ 244 if (IN6_IS_SCOPE_LINKLOCAL(dst6)) 245 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); 246 247 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); 248 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 249 rt = RNTORT(rn); 250 nh = rt->rt_nhop; 251 /* Ensure route & ifp is UP */ 252 if (RT_LINK_IS_UP(nh->nh_ifp)) { 253 if (flags & NHR_REF) 254 nhop_ref_object(nh); 255 return (nh); 256 } 257 } 258 259 return (NULL); 260 } 261 262 #endif 263 264