diff options
Diffstat (limited to 'sys/netinet/in.c')
| -rw-r--r-- | sys/netinet/in.c | 58 |
1 files changed, 57 insertions, 1 deletions
diff --git a/sys/netinet/in.c b/sys/netinet/in.c index 5681667a688..3651c120af8 100644 --- a/sys/netinet/in.c +++ b/sys/netinet/in.c @@ -1,4 +1,4 @@ -/* $OpenBSD: in.c,v 1.144 2017/11/04 13:11:54 mpi Exp $ */ +/* $OpenBSD: in.c,v 1.145 2018/02/10 05:32:21 claudio Exp $ */ /* $NetBSD: in.c,v 1.26 1996/02/13 23:41:39 christos Exp $ */ /* @@ -609,6 +609,62 @@ in_broadcast(struct in_addr in, u_int rtableid) #undef ia } +int +in_up_loopback(struct ifnet *ifp) +{ + struct in_ifaddr *ia; + struct rt_addrinfo info; + int error; + + if ((ifp->if_flags & IFF_LOOPBACK) == 0) + return (0); + + /* configure 127.0.0.1 on the loopback interface */ + ia = malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO); + ia->ia_addr.sin_family = AF_INET; + ia->ia_addr.sin_len = sizeof(ia->ia_addr); + ia->ia_addr.sin_addr.s_addr = INADDR_LOOPBACK; + ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr); + ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr); + ia->ia_ifa.ifa_netmask = sintosa(&ia->ia_sockmask); + ia->ia_netmask = IN_CLASSA_NET; + ia->ia_sockmask.sin_len = 8; + ia->ia_sockmask.sin_addr.s_addr = ia->ia_netmask; + ia->ia_ifp = ifp; + + if (ifaof_ifpforaddr(ia->ia_ifa.ifa_addr, ifp) != NULL) { + free(ia, M_IFADDR, sizeof *ia); + return (0); + } + + /* + * Add the address to the local list and the global tree. If an + * error occured, cleanup. + */ + ifa_add(ifp, &ia->ia_ifa); + error = rt_ifa_addlocal(&ia->ia_ifa); + if (error) + goto out; + + ia->ia_net = ia->ia_addr.sin_addr.s_addr & ia->ia_netmask; + in_socktrim(&ia->ia_sockmask); + + /* Now insert a reject route for 127.0.0.0/8 */ + bzero((caddr_t)&info, sizeof(info)); + info.rti_flags = RTF_GATEWAY | RTF_REJECT | RTF_STATIC; + info.rti_ifa = &ia->ia_ifa; + info.rti_info[RTAX_DST] = ia->ia_ifa.ifa_addr; + info.rti_info[RTAX_NETMASK] = ia->ia_ifa.ifa_netmask; + info.rti_info[RTAX_GATEWAY] = ia->ia_ifa.ifa_addr; + + error = rtrequest(RTM_ADD, &info, 0, NULL, ifp->if_rdomain); + +out: + if (error) + in_purgeaddr(&ia->ia_ifa); + return (error); +} + /* * Add an address to the list of IP multicast addresses for a given interface. */ |