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 * 4. 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_route.h" 35 #include "opt_mpath.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/lock.h> 40 #include <sys/rwlock.h> 41 #include <sys/malloc.h> 42 #include <sys/mbuf.h> 43 #include <sys/socket.h> 44 #include <sys/sysctl.h> 45 #include <sys/kernel.h> 46 47 #include <net/if.h> 48 #include <net/if_var.h> 49 #include <net/if_dl.h> 50 #include <net/route.h> 51 #include <net/vnet.h> 52 53 #ifdef RADIX_MPATH 54 #include <net/radix_mpath.h> 55 #endif 56 57 #include <netinet/in.h> 58 #include <netinet/in_var.h> 59 #include <netinet/in_fib.h> 60 61 #ifdef INET 62 static void fib4_rte_to_nh_basic(struct rtentry *rte, struct in_addr dst, 63 uint32_t flags, struct nhop4_basic *pnh4); 64 static void fib4_rte_to_nh_extended(struct rtentry *rte, struct in_addr dst, 65 uint32_t flags, struct nhop4_extended *pnh4); 66 67 #define RNTORT(p) ((struct rtentry *)(p)) 68 69 static void 70 fib4_rte_to_nh_basic(struct rtentry *rte, struct in_addr dst, 71 uint32_t flags, struct nhop4_basic *pnh4) 72 { 73 struct sockaddr_in *gw; 74 75 if ((flags & NHR_IFAIF) != 0) 76 pnh4->nh_ifp = rte->rt_ifa->ifa_ifp; 77 else 78 pnh4->nh_ifp = rte->rt_ifp; 79 pnh4->nh_mtu = min(rte->rt_mtu, rte->rt_ifp->if_mtu); 80 if (rte->rt_flags & RTF_GATEWAY) { 81 gw = (struct sockaddr_in *)rte->rt_gateway; 82 pnh4->nh_addr = gw->sin_addr; 83 } else 84 pnh4->nh_addr = dst; 85 /* Set flags */ 86 pnh4->nh_flags = fib_rte_to_nh_flags(rte->rt_flags); 87 gw = (struct sockaddr_in *)rt_key(rte); 88 if (gw->sin_addr.s_addr == 0) 89 pnh4->nh_flags |= NHF_DEFAULT; 90 /* TODO: Handle RTF_BROADCAST here */ 91 } 92 93 static void 94 fib4_rte_to_nh_extended(struct rtentry *rte, struct in_addr dst, 95 uint32_t flags, struct nhop4_extended *pnh4) 96 { 97 struct sockaddr_in *gw; 98 struct in_ifaddr *ia; 99 100 if ((flags & NHR_IFAIF) != 0) 101 pnh4->nh_ifp = rte->rt_ifa->ifa_ifp; 102 else 103 pnh4->nh_ifp = rte->rt_ifp; 104 pnh4->nh_mtu = min(rte->rt_mtu, rte->rt_ifp->if_mtu); 105 if (rte->rt_flags & RTF_GATEWAY) { 106 gw = (struct sockaddr_in *)rte->rt_gateway; 107 pnh4->nh_addr = gw->sin_addr; 108 } else 109 pnh4->nh_addr = dst; 110 /* Set flags */ 111 pnh4->nh_flags = fib_rte_to_nh_flags(rte->rt_flags); 112 gw = (struct sockaddr_in *)rt_key(rte); 113 if (gw->sin_addr.s_addr == 0) 114 pnh4->nh_flags |= NHF_DEFAULT; 115 /* XXX: Set RTF_BROADCAST if GW address is broadcast */ 116 117 ia = ifatoia(rte->rt_ifa); 118 pnh4->nh_src = IA_SIN(ia)->sin_addr; 119 } 120 121 /* 122 * Performs IPv4 route table lookup on @dst. Returns 0 on success. 123 * Stores nexthop info provided @pnh4 structure. 124 * Note that 125 * - nh_ifp cannot be safely dereferenced 126 * - nh_ifp represents logical transmit interface (rt_ifp) (e.g. if 127 * looking up address on interface "ix0" pointer to "lo0" interface 128 * will be returned instead of "ix0") 129 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed 130 * - howewer mtu from "transmit" interface will be returned. 131 */ 132 int 133 fib4_lookup_nh_basic(uint32_t fibnum, struct in_addr dst, uint32_t flags, 134 uint32_t flowid, struct nhop4_basic *pnh4) 135 { 136 struct radix_node_head *rh; 137 struct radix_node *rn; 138 struct sockaddr_in sin; 139 struct rtentry *rte; 140 141 KASSERT((fibnum < rt_numfibs), ("fib4_lookup_nh_basic: bad fibnum")); 142 rh = rt_tables_get_rnh(fibnum, AF_INET); 143 if (rh == NULL) 144 return (ENOENT); 145 146 /* Prepare lookup key */ 147 memset(&sin, 0, sizeof(sin)); 148 sin.sin_len = sizeof(struct sockaddr_in); 149 sin.sin_addr = dst; 150 151 RADIX_NODE_HEAD_RLOCK(rh); 152 rn = rh->rnh_matchaddr((void *)&sin, rh); 153 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 154 rte = RNTORT(rn); 155 /* Ensure route & ifp is UP */ 156 if (RT_LINK_IS_UP(rte->rt_ifp)) { 157 fib4_rte_to_nh_basic(rte, dst, flags, pnh4); 158 RADIX_NODE_HEAD_RUNLOCK(rh); 159 160 return (0); 161 } 162 } 163 RADIX_NODE_HEAD_RUNLOCK(rh); 164 165 return (ENOENT); 166 } 167 168 /* 169 * Performs IPv4 route table lookup on @dst. Returns 0 on success. 170 * Stores extende nexthop info provided @pnh4 structure. 171 * Note that 172 * - nh_ifp cannot be safely dereferenced unless NHR_REF is specified. 173 * - in that case you need to call fib4_free_nh_ext() 174 * - nh_ifp represents logical transmit interface (rt_ifp) (e.g. if 175 * looking up address of interface "ix0" pointer to "lo0" interface 176 * will be returned instead of "ix0") 177 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed 178 * - howewer mtu from "transmit" interface will be returned. 179 */ 180 int 181 fib4_lookup_nh_ext(uint32_t fibnum, struct in_addr dst, uint32_t flags, 182 uint32_t flowid, struct nhop4_extended *pnh4) 183 { 184 struct radix_node_head *rh; 185 struct radix_node *rn; 186 struct sockaddr_in sin; 187 struct rtentry *rte; 188 189 KASSERT((fibnum < rt_numfibs), ("fib4_lookup_nh_ext: bad fibnum")); 190 rh = rt_tables_get_rnh(fibnum, AF_INET); 191 if (rh == NULL) 192 return (ENOENT); 193 194 /* Prepare lookup key */ 195 memset(&sin, 0, sizeof(sin)); 196 sin.sin_len = sizeof(struct sockaddr_in); 197 sin.sin_addr = dst; 198 199 RADIX_NODE_HEAD_RLOCK(rh); 200 rn = rh->rnh_matchaddr((void *)&sin, rh); 201 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 202 rte = RNTORT(rn); 203 #ifdef RADIX_MPATH 204 rte = rt_mpath_select(rte, flowid); 205 if (rte == NULL) { 206 RADIX_NODE_HEAD_RUNLOCK(rh); 207 return (ENOENT); 208 } 209 #endif 210 /* Ensure route & ifp is UP */ 211 if (RT_LINK_IS_UP(rte->rt_ifp)) { 212 fib4_rte_to_nh_extended(rte, dst, flags, pnh4); 213 if ((flags & NHR_REF) != 0) { 214 /* TODO: lwref on egress ifp's ? */ 215 } 216 RADIX_NODE_HEAD_RUNLOCK(rh); 217 218 return (0); 219 } 220 } 221 RADIX_NODE_HEAD_RUNLOCK(rh); 222 223 return (ENOENT); 224 } 225 226 void 227 fib4_free_nh_ext(uint32_t fibnum, struct nhop4_extended *pnh4) 228 { 229 230 } 231 232 #endif 233