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31 * @(#)route.c 8.3.1.1 (Berkeley) 2/23/95
35 #include "opt_route.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/malloc.h>
40 #include <sys/socket.h>
41 #include <sys/sysctl.h>
42 #include <sys/syslog.h>
43 #include <sys/kernel.h>
45 #include <sys/rmlock.h>
48 #include <net/if_var.h>
49 #include <net/if_dl.h>
50 #include <net/route.h>
51 #include <net/route/route_ctl.h>
52 #include <net/route/route_var.h>
53 #include <net/route/nhop.h>
56 #include <netinet/in.h>
59 * Control interface address fib propagation.
60 * By default, interface address routes are added to the fib of the interface.
61 * Once set to non-zero, adds interface address route to all fibs.
63 VNET_DEFINE(u_int, rt_add_addr_allfibs) = 0;
64 SYSCTL_UINT(_net, OID_AUTO, add_addr_allfibs, CTLFLAG_RWTUN | CTLFLAG_VNET,
65 &VNET_NAME(rt_add_addr_allfibs), 0, "");
68 * Executes routing tables change specified by @cmd and @info for the fib
69 * @fibnum. Generates routing message on success.
70 * Note: it assumes there is only single route (interface route) for the
72 * Returns 0 on success or errno.
75 rib_handle_ifaddr_one(uint32_t fibnum, int cmd, struct rt_addrinfo *info)
77 struct rib_cmd_info rc;
78 struct nhop_object *nh;
81 error = rib_action(fibnum, cmd, info, &rc);
84 nh = nhop_select(rc.rc_nh_new, 0);
86 nh = nhop_select(rc.rc_nh_old, 0);
87 rt_routemsg(cmd, rc.rc_rt, nh, fibnum);
94 * Adds/deletes interface prefix specified by @info to the routing table.
95 * If V_rt_add_addr_allfibs is set, iterates over all existing routing
96 * tables, otherwise uses fib in @fibnum. Generates routing message for
98 * Returns 0 on success or errno.
101 rib_handle_ifaddr_info(uint32_t fibnum, int cmd, struct rt_addrinfo *info)
103 int error = 0, last_error = 0;
104 bool didwork = false;
106 if (V_rt_add_addr_allfibs == 0) {
107 error = rib_handle_ifaddr_one(fibnum, cmd, info);
108 didwork = (error == 0);
110 for (fibnum = 0; fibnum < V_rt_numfibs; fibnum++) {
111 error = rib_handle_ifaddr_one(fibnum, cmd, info);
119 if (cmd == RTM_DELETE) {
123 /* we only give an error if it wasn't in any table */
124 error = ((info->rti_flags & RTF_HOST) ?
125 EHOSTUNREACH : ENETUNREACH);
128 if (last_error != 0) {
129 /* return an error if any of them failed */
137 ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa,
140 struct rib_cmd_info rc;
141 struct epoch_tracker et;
143 struct rt_addrinfo info;
144 struct sockaddr_dl null_sdl;
150 bzero(&info, sizeof(info));
151 if (cmd != RTM_DELETE)
152 info.rti_ifp = V_loif;
153 if (cmd == RTM_ADD) {
154 /* explicitly specify (loopback) ifa */
155 if (info.rti_ifp != NULL)
156 info.rti_ifa = ifaof_ifpforaddr(ifa->ifa_addr, info.rti_ifp);
158 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED;
159 info.rti_info[RTAX_DST] = ia;
160 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
161 link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type);
163 error = rib_action(ifp->if_fib, cmd, &info, &rc);
167 (cmd == RTM_ADD && error == EEXIST) ||
168 (cmd == RTM_DELETE && (error == ENOENT || error == ESRCH)))
171 log(LOG_DEBUG, "%s: %s failed for interface %s: %u\n",
172 __func__, otype, if_name(ifp), error);
178 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
181 return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia));
185 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
188 return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia));
192 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
195 return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia));