diff options
Diffstat (limited to 'sys/netinet/in.c')
| -rw-r--r-- | sys/netinet/in.c | 1592 |
1 files changed, 1592 insertions, 0 deletions
diff --git a/sys/netinet/in.c b/sys/netinet/in.c new file mode 100644 index 0000000..3ddb46c --- /dev/null +++ b/sys/netinet/in.c @@ -0,0 +1,1592 @@ +/*- + * Copyright (c) 1982, 1986, 1991, 1993 + * The Regents of the University of California. All rights reserved. + * Copyright (C) 2001 WIDE Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)in.c 8.4 (Berkeley) 1/9/95 + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_mpath.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/sockio.h> +#include <sys/malloc.h> +#include <sys/priv.h> +#include <sys/socket.h> +#include <sys/jail.h> +#include <sys/kernel.h> +#include <sys/proc.h> +#include <sys/sysctl.h> +#include <sys/syslog.h> + +#include <net/if.h> +#include <net/if_var.h> +#include <net/if_arp.h> +#include <net/if_dl.h> +#include <net/if_llatbl.h> +#include <net/if_types.h> +#include <net/route.h> +#include <net/vnet.h> + +#include <netinet/if_ether.h> +#include <netinet/in.h> +#include <netinet/in_var.h> +#include <netinet/in_pcb.h> +#include <netinet/ip_var.h> +#include <netinet/ip_carp.h> +#include <netinet/igmp_var.h> +#include <netinet/udp.h> +#include <netinet/udp_var.h> + +static int in_mask2len(struct in_addr *); +static void in_len2mask(struct in_addr *, int); +static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, + struct ifnet *, struct thread *); + +static void in_socktrim(struct sockaddr_in *); +static int in_ifinit(struct ifnet *, struct in_ifaddr *, + struct sockaddr_in *, int, int); +static void in_purgemaddrs(struct ifnet *); + +static VNET_DEFINE(int, nosameprefix); +#define V_nosameprefix VNET(nosameprefix) +SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_RW, + &VNET_NAME(nosameprefix), 0, + "Refuse to create same prefixes on different interfaces"); + +VNET_DECLARE(struct inpcbinfo, ripcbinfo); +#define V_ripcbinfo VNET(ripcbinfo) + +VNET_DECLARE(struct arpstat, arpstat); /* ARP statistics, see if_arp.h */ +#define V_arpstat VNET(arpstat) + +/* + * Return 1 if an internet address is for a ``local'' host + * (one to which we have a connection). + */ +int +in_localaddr(struct in_addr in) +{ + register u_long i = ntohl(in.s_addr); + register struct in_ifaddr *ia; + + IN_IFADDR_RLOCK(); + TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { + if ((i & ia->ia_subnetmask) == ia->ia_subnet) { + IN_IFADDR_RUNLOCK(); + return (1); + } + } + IN_IFADDR_RUNLOCK(); + return (0); +} + +/* + * Return 1 if an internet address is for the local host and configured + * on one of its interfaces. + */ +int +in_localip(struct in_addr in) +{ + struct in_ifaddr *ia; + + IN_IFADDR_RLOCK(); + LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { + if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) { + IN_IFADDR_RUNLOCK(); + return (1); + } + } + IN_IFADDR_RUNLOCK(); + return (0); +} + +/* + * Determine whether an IP address is in a reserved set of addresses + * that may not be forwarded, or whether datagrams to that destination + * may be forwarded. + */ +int +in_canforward(struct in_addr in) +{ + register u_long i = ntohl(in.s_addr); + register u_long net; + + if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) + return (0); + if (IN_CLASSA(i)) { + net = i & IN_CLASSA_NET; + if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) + return (0); + } + return (1); +} + +/* + * Trim a mask in a sockaddr + */ +static void +in_socktrim(struct sockaddr_in *ap) +{ + register char *cplim = (char *) &ap->sin_addr; + register char *cp = (char *) (&ap->sin_addr + 1); + + ap->sin_len = 0; + while (--cp >= cplim) + if (*cp) { + (ap)->sin_len = cp - (char *) (ap) + 1; + break; + } +} + +static int +in_mask2len(mask) + struct in_addr *mask; +{ + int x, y; + u_char *p; + + p = (u_char *)mask; + for (x = 0; x < sizeof(*mask); x++) { + if (p[x] != 0xff) + break; + } + y = 0; + if (x < sizeof(*mask)) { + for (y = 0; y < 8; y++) { + if ((p[x] & (0x80 >> y)) == 0) + break; + } + } + return (x * 8 + y); +} + +static void +in_len2mask(struct in_addr *mask, int len) +{ + int i; + u_char *p; + + p = (u_char *)mask; + bzero(mask, sizeof(*mask)); + for (i = 0; i < len / 8; i++) + p[i] = 0xff; + if (len % 8) + p[i] = (0xff00 >> (len % 8)) & 0xff; +} + +/* + * Generic internet control operations (ioctl's). + * + * ifp is NULL if not an interface-specific ioctl. + */ +/* ARGSUSED */ +int +in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, + struct thread *td) +{ + register struct ifreq *ifr = (struct ifreq *)data; + register struct in_ifaddr *ia, *iap; + register struct ifaddr *ifa; + struct in_addr allhosts_addr; + struct in_addr dst; + struct in_ifinfo *ii; + struct in_aliasreq *ifra = (struct in_aliasreq *)data; + int error, hostIsNew, iaIsNew, maskIsNew; + int iaIsFirst; + u_long ocmd = cmd; + + /* + * Pre-10.x compat: OSIOCAIFADDR passes a shorter + * struct in_aliasreq, without ifra_vhid. + */ + if (cmd == OSIOCAIFADDR) + cmd = SIOCAIFADDR; + + ia = NULL; + iaIsFirst = 0; + iaIsNew = 0; + allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); + + /* + * Filter out ioctls we implement directly; forward the rest on to + * in_lifaddr_ioctl() and ifp->if_ioctl(). + */ + switch (cmd) { + case SIOCGIFADDR: + case SIOCGIFBRDADDR: + case SIOCGIFDSTADDR: + case SIOCGIFNETMASK: + case SIOCDIFADDR: + break; + case SIOCAIFADDR: + /* + * ifra_addr must be present and be of INET family. + * ifra_broadaddr and ifra_mask are optional. + */ + if (ifra->ifra_addr.sin_len != sizeof(struct sockaddr_in) || + ifra->ifra_addr.sin_family != AF_INET) + return (EINVAL); + if (ifra->ifra_broadaddr.sin_len != 0 && + (ifra->ifra_broadaddr.sin_len != + sizeof(struct sockaddr_in) || + ifra->ifra_broadaddr.sin_family != AF_INET)) + return (EINVAL); +#if 0 + /* + * ifconfig(8) in pre-10.x doesn't set sin_family for the + * mask. The code is disabled for the 10.x timeline, to + * make SIOCAIFADDR compatible with 9.x ifconfig(8). + * The code should be enabled in 11.x + */ + if (ifra->ifra_mask.sin_len != 0 && + (ifra->ifra_mask.sin_len != sizeof(struct sockaddr_in) || + ifra->ifra_mask.sin_family != AF_INET)) + return (EINVAL); +#endif + break; + case SIOCSIFADDR: + case SIOCSIFBRDADDR: + case SIOCSIFDSTADDR: + case SIOCSIFNETMASK: + /* We no longer support that old commands. */ + return (EINVAL); + + case SIOCALIFADDR: + if (td != NULL) { + error = priv_check(td, PRIV_NET_ADDIFADDR); + if (error) + return (error); + } + if (ifp == NULL) + return (EINVAL); + return in_lifaddr_ioctl(so, cmd, data, ifp, td); + + case SIOCDLIFADDR: + if (td != NULL) { + error = priv_check(td, PRIV_NET_DELIFADDR); + if (error) + return (error); + } + if (ifp == NULL) + return (EINVAL); + return in_lifaddr_ioctl(so, cmd, data, ifp, td); + + case SIOCGLIFADDR: + if (ifp == NULL) + return (EINVAL); + return in_lifaddr_ioctl(so, cmd, data, ifp, td); + + default: + if (ifp == NULL || ifp->if_ioctl == NULL) + return (EOPNOTSUPP); + return ((*ifp->if_ioctl)(ifp, cmd, data)); + } + + if (ifp == NULL) + return (EADDRNOTAVAIL); + + /* + * Security checks before we get involved in any work. + */ + switch (cmd) { + case SIOCAIFADDR: + if (td != NULL) { + error = priv_check(td, PRIV_NET_ADDIFADDR); + if (error) + return (error); + } + break; + + case SIOCDIFADDR: + if (td != NULL) { + error = priv_check(td, PRIV_NET_DELIFADDR); + if (error) + return (error); + } + break; + } + + /* + * Find address for this interface, if it exists. + * + * If an alias address was specified, find that one instead of the + * first one on the interface, if possible. + */ + dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; + IN_IFADDR_RLOCK(); + LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { + if (iap->ia_ifp == ifp && + iap->ia_addr.sin_addr.s_addr == dst.s_addr) { + if (td == NULL || prison_check_ip4(td->td_ucred, + &dst) == 0) + ia = iap; + break; + } + } + if (ia != NULL) + ifa_ref(&ia->ia_ifa); + IN_IFADDR_RUNLOCK(); + if (ia == NULL) { + IF_ADDR_RLOCK(ifp); + TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { + iap = ifatoia(ifa); + if (iap->ia_addr.sin_family == AF_INET) { + if (td != NULL && + prison_check_ip4(td->td_ucred, + &iap->ia_addr.sin_addr) != 0) + continue; + ia = iap; + break; + } + } + if (ia != NULL) + ifa_ref(&ia->ia_ifa); + IF_ADDR_RUNLOCK(ifp); + } + if (ia == NULL) + iaIsFirst = 1; + + error = 0; + switch (cmd) { + case SIOCAIFADDR: + case SIOCDIFADDR: + if (ifra->ifra_addr.sin_family == AF_INET) { + struct in_ifaddr *oia; + + IN_IFADDR_RLOCK(); + for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { + if (ia->ia_ifp == ifp && + ia->ia_addr.sin_addr.s_addr == + ifra->ifra_addr.sin_addr.s_addr) + break; + } + if (ia != NULL && ia != oia) + ifa_ref(&ia->ia_ifa); + if (oia != NULL && ia != oia) + ifa_free(&oia->ia_ifa); + IN_IFADDR_RUNLOCK(); + if ((ifp->if_flags & IFF_POINTOPOINT) + && (cmd == SIOCAIFADDR) + && (ifra->ifra_dstaddr.sin_addr.s_addr + == INADDR_ANY)) { + error = EDESTADDRREQ; + goto out; + } + } + if (cmd == SIOCDIFADDR && ia == NULL) { + error = EADDRNOTAVAIL; + goto out; + } + if (ia == NULL) { + ia = (struct in_ifaddr *) + malloc(sizeof *ia, M_IFADDR, M_NOWAIT | + M_ZERO); + if (ia == NULL) { + error = ENOBUFS; + goto out; + } + + ifa = &ia->ia_ifa; + ifa_init(ifa); + ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; + ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; + ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; + + ia->ia_sockmask.sin_len = 8; + ia->ia_sockmask.sin_family = AF_INET; + if (ifp->if_flags & IFF_BROADCAST) { + ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); + ia->ia_broadaddr.sin_family = AF_INET; + } + ia->ia_ifp = ifp; + + ifa_ref(ifa); /* if_addrhead */ + IF_ADDR_WLOCK(ifp); + TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); + IF_ADDR_WUNLOCK(ifp); + ifa_ref(ifa); /* in_ifaddrhead */ + IN_IFADDR_WLOCK(); + TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); + IN_IFADDR_WUNLOCK(); + iaIsNew = 1; + } + break; + + case SIOCGIFADDR: + case SIOCGIFNETMASK: + case SIOCGIFDSTADDR: + case SIOCGIFBRDADDR: + if (ia == NULL) { + error = EADDRNOTAVAIL; + goto out; + } + break; + } + + /* + * Most paths in this switch return directly or via out. Only paths + * that remove the address break in order to hit common removal code. + */ + switch (cmd) { + case SIOCGIFADDR: + *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; + goto out; + + case SIOCGIFBRDADDR: + if ((ifp->if_flags & IFF_BROADCAST) == 0) { + error = EINVAL; + goto out; + } + *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; + goto out; + + case SIOCGIFDSTADDR: + if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { + error = EINVAL; + goto out; + } + *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; + goto out; + + case SIOCGIFNETMASK: + *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; + goto out; + + case SIOCAIFADDR: + maskIsNew = 0; + hostIsNew = 1; + error = 0; + if (ifra->ifra_addr.sin_addr.s_addr == + ia->ia_addr.sin_addr.s_addr) + hostIsNew = 0; + if (ifra->ifra_mask.sin_len) { + /* + * QL: XXX + * Need to scrub the prefix here in case + * the issued command is SIOCAIFADDR with + * the same address, but with a different + * prefix length. And if the prefix length + * is the same as before, then the call is + * un-necessarily executed here. + */ + in_ifscrub(ifp, ia, LLE_STATIC); + ia->ia_sockmask = ifra->ifra_mask; + ia->ia_sockmask.sin_family = AF_INET; + ia->ia_subnetmask = + ntohl(ia->ia_sockmask.sin_addr.s_addr); + maskIsNew = 1; + } + if ((ifp->if_flags & IFF_POINTOPOINT) && + (ifra->ifra_dstaddr.sin_family == AF_INET)) { + in_ifscrub(ifp, ia, LLE_STATIC); + ia->ia_dstaddr = ifra->ifra_dstaddr; + maskIsNew = 1; /* We lie; but the effect's the same */ + } + if (hostIsNew || maskIsNew) + error = in_ifinit(ifp, ia, &ifra->ifra_addr, maskIsNew, + (ocmd == cmd ? ifra->ifra_vhid : 0)); + if (error != 0 && iaIsNew) + break; + + if ((ifp->if_flags & IFF_BROADCAST) && + ifra->ifra_broadaddr.sin_len) + ia->ia_broadaddr = ifra->ifra_broadaddr; + if (error == 0) { + ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); + if (iaIsFirst && + (ifp->if_flags & IFF_MULTICAST) != 0) { + error = in_joingroup(ifp, &allhosts_addr, + NULL, &ii->ii_allhosts); + } + EVENTHANDLER_INVOKE(ifaddr_event, ifp); + } + goto out; + + case SIOCDIFADDR: + /* + * in_ifscrub kills the interface route. + */ + in_ifscrub(ifp, ia, LLE_STATIC); + + /* + * in_ifadown gets rid of all the rest of + * the routes. This is not quite the right + * thing to do, but at least if we are running + * a routing process they will come back. + */ + in_ifadown(&ia->ia_ifa, 1); + EVENTHANDLER_INVOKE(ifaddr_event, ifp); + error = 0; + break; + + default: + panic("in_control: unsupported ioctl"); + } + + if (ia->ia_ifa.ifa_carp) + (*carp_detach_p)(&ia->ia_ifa); + + IF_ADDR_WLOCK(ifp); + /* Re-check that ia is still part of the list. */ + TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { + if (ifa == &ia->ia_ifa) + break; + } + if (ifa == NULL) { + /* + * If we lost the race with another thread, there is no need to + * try it again for the next loop as there is no other exit + * path between here and out. + */ + IF_ADDR_WUNLOCK(ifp); + error = EADDRNOTAVAIL; + goto out; + } + TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); + IF_ADDR_WUNLOCK(ifp); + ifa_free(&ia->ia_ifa); /* if_addrhead */ + + IN_IFADDR_WLOCK(); + TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); + + LIST_REMOVE(ia, ia_hash); + IN_IFADDR_WUNLOCK(); + /* + * If this is the last IPv4 address configured on this + * interface, leave the all-hosts group. + * No state-change report need be transmitted. + */ + IFP_TO_IA(ifp, iap); + if (iap == NULL) { + ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); + IN_MULTI_LOCK(); + if (ii->ii_allhosts) { + (void)in_leavegroup_locked(ii->ii_allhosts, NULL); + ii->ii_allhosts = NULL; + } + IN_MULTI_UNLOCK(); + } else + ifa_free(&iap->ia_ifa); + + ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ +out: + if (ia != NULL) + ifa_free(&ia->ia_ifa); + return (error); +} + +/* + * SIOC[GAD]LIFADDR. + * SIOCGLIFADDR: get first address. (?!?) + * SIOCGLIFADDR with IFLR_PREFIX: + * get first address that matches the specified prefix. + * SIOCALIFADDR: add the specified address. + * SIOCALIFADDR with IFLR_PREFIX: + * EINVAL since we can't deduce hostid part of the address. + * SIOCDLIFADDR: delete the specified address. + * SIOCDLIFADDR with IFLR_PREFIX: + * delete the first address that matches the specified prefix. + * return values: + * EINVAL on invalid parameters + * EADDRNOTAVAIL on prefix match failed/specified address not found + * other values may be returned from in_ioctl() + */ +static int +in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, + struct ifnet *ifp, struct thread *td) +{ + struct if_laddrreq *iflr = (struct if_laddrreq *)data; + struct ifaddr *ifa; + + /* sanity checks */ + if (data == NULL || ifp == NULL) { + panic("invalid argument to in_lifaddr_ioctl"); + /*NOTRECHED*/ + } + + switch (cmd) { + case SIOCGLIFADDR: + /* address must be specified on GET with IFLR_PREFIX */ + if ((iflr->flags & IFLR_PREFIX) == 0) + break; + /*FALLTHROUGH*/ + case SIOCALIFADDR: + case SIOCDLIFADDR: + /* address must be specified on ADD and DELETE */ + if (iflr->addr.ss_family != AF_INET) + return (EINVAL); + if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) + return (EINVAL); + /* XXX need improvement */ + if (iflr->dstaddr.ss_family + && iflr->dstaddr.ss_family != AF_INET) + return (EINVAL); + if (iflr->dstaddr.ss_family + && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) + return (EINVAL); + break; + default: /*shouldn't happen*/ + return (EOPNOTSUPP); + } + if (sizeof(struct in_addr) * 8 < iflr->prefixlen) + return (EINVAL); + + switch (cmd) { + case SIOCALIFADDR: + { + struct in_aliasreq ifra; + + if (iflr->flags & IFLR_PREFIX) + return (EINVAL); + + /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */ + bzero(&ifra, sizeof(ifra)); + bcopy(iflr->iflr_name, ifra.ifra_name, + sizeof(ifra.ifra_name)); + + bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); + + if (iflr->dstaddr.ss_family) { /*XXX*/ + bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, + iflr->dstaddr.ss_len); + } + + ifra.ifra_mask.sin_family = AF_INET; + ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); + in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); + + return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); + } + case SIOCGLIFADDR: + case SIOCDLIFADDR: + { + struct in_ifaddr *ia; + struct in_addr mask, candidate, match; + struct sockaddr_in *sin; + + bzero(&mask, sizeof(mask)); + bzero(&match, sizeof(match)); + if (iflr->flags & IFLR_PREFIX) { + /* lookup a prefix rather than address. */ + in_len2mask(&mask, iflr->prefixlen); + + sin = (struct sockaddr_in *)&iflr->addr; + match.s_addr = sin->sin_addr.s_addr; + match.s_addr &= mask.s_addr; + + /* if you set extra bits, that's wrong */ + if (match.s_addr != sin->sin_addr.s_addr) + return (EINVAL); + + } else { + /* on getting an address, take the 1st match */ + /* on deleting an address, do exact match */ + if (cmd != SIOCGLIFADDR) { + in_len2mask(&mask, 32); + sin = (struct sockaddr_in *)&iflr->addr; + match.s_addr = sin->sin_addr.s_addr; + } + } + + IF_ADDR_RLOCK(ifp); + TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { + if (ifa->ifa_addr->sa_family != AF_INET) + continue; + if (match.s_addr == 0) + break; + sin = (struct sockaddr_in *)&ifa->ifa_addr; + candidate.s_addr = sin->sin_addr.s_addr; + candidate.s_addr &= mask.s_addr; + if (candidate.s_addr == match.s_addr) + break; + } + if (ifa != NULL) + ifa_ref(ifa); + IF_ADDR_RUNLOCK(ifp); + if (ifa == NULL) + return (EADDRNOTAVAIL); + ia = (struct in_ifaddr *)ifa; + + if (cmd == SIOCGLIFADDR) { + /* fill in the if_laddrreq structure */ + bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); + + if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { + bcopy(&ia->ia_dstaddr, &iflr->dstaddr, + ia->ia_dstaddr.sin_len); + } else + bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); + + iflr->prefixlen = + in_mask2len(&ia->ia_sockmask.sin_addr); + + iflr->flags = 0; /*XXX*/ + ifa_free(ifa); + + return (0); + } else { + struct in_aliasreq ifra; + + /* fill in_aliasreq and do ioctl(SIOCDIFADDR) */ + bzero(&ifra, sizeof(ifra)); + bcopy(iflr->iflr_name, ifra.ifra_name, + sizeof(ifra.ifra_name)); + + bcopy(&ia->ia_addr, &ifra.ifra_addr, + ia->ia_addr.sin_len); + if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { + bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, + ia->ia_dstaddr.sin_len); + } + bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, + ia->ia_sockmask.sin_len); + ifa_free(ifa); + + return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, + ifp, td)); + } + } + } + + return (EOPNOTSUPP); /*just for safety*/ +} + +/* + * Delete any existing route for an interface. + */ +void +in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia, u_int flags) +{ + + in_scrubprefix(ia, flags); +} + +/* + * Initialize an interface's internet address + * and routing table entry. + */ +static int +in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, + int masksupplied, int vhid) +{ + register u_long i = ntohl(sin->sin_addr.s_addr); + int flags, error = 0; + + IN_IFADDR_WLOCK(); + if (ia->ia_addr.sin_family == AF_INET) + LIST_REMOVE(ia, ia_hash); + ia->ia_addr = *sin; + LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), + ia, ia_hash); + IN_IFADDR_WUNLOCK(); + + if (vhid > 0) { + if (carp_attach_p != NULL) + error = (*carp_attach_p)(&ia->ia_ifa, vhid); + else + error = EPROTONOSUPPORT; + } + if (error) + return (error); + + /* + * Give the interface a chance to initialize + * if this is its first address, + * and to validate the address if necessary. + */ + if (ifp->if_ioctl != NULL && + (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia)) != 0) + /* LIST_REMOVE(ia, ia_hash) is done in in_control */ + return (error); + + /* + * Be compatible with network classes, if netmask isn't supplied, + * guess it based on classes. + */ + if (!masksupplied) { + if (IN_CLASSA(i)) + ia->ia_subnetmask = IN_CLASSA_NET; + else if (IN_CLASSB(i)) + ia->ia_subnetmask = IN_CLASSB_NET; + else + ia->ia_subnetmask = IN_CLASSC_NET; + ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); + } + ia->ia_subnet = i & ia->ia_subnetmask; + in_socktrim(&ia->ia_sockmask); + + /* + * Add route for the network. + */ + flags = RTF_UP; + ia->ia_ifa.ifa_metric = ifp->if_metric; + if (ifp->if_flags & IFF_BROADCAST) { + if (ia->ia_subnetmask == IN_RFC3021_MASK) + ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; + else + ia->ia_broadaddr.sin_addr.s_addr = + htonl(ia->ia_subnet | ~ia->ia_subnetmask); + } else if (ifp->if_flags & IFF_LOOPBACK) { + ia->ia_dstaddr = ia->ia_addr; + flags |= RTF_HOST; + } else if (ifp->if_flags & IFF_POINTOPOINT) { + if (ia->ia_dstaddr.sin_family != AF_INET) + return (0); + flags |= RTF_HOST; + } + if (!vhid && (error = in_addprefix(ia, flags)) != 0) + return (error); + + if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) + return (0); + + if (ifp->if_flags & IFF_POINTOPOINT && + ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) + return (0); + + /* + * add a loopback route to self + */ + if (V_useloopback && !vhid && !(ifp->if_flags & IFF_LOOPBACK)) { + struct route ia_ro; + + bzero(&ia_ro, sizeof(ia_ro)); + *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr; + rtalloc_ign_fib(&ia_ro, 0, RT_DEFAULT_FIB); + if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && + (ia_ro.ro_rt->rt_ifp == V_loif)) { + RT_LOCK(ia_ro.ro_rt); + RT_ADDREF(ia_ro.ro_rt); + RTFREE_LOCKED(ia_ro.ro_rt); + } else + error = ifa_add_loopback_route((struct ifaddr *)ia, + (struct sockaddr *)&ia->ia_addr); + if (error == 0) + ia->ia_flags |= IFA_RTSELF; + if (ia_ro.ro_rt != NULL) + RTFREE(ia_ro.ro_rt); + } + + return (error); +} + +#define rtinitflags(x) \ + ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ + ? RTF_HOST : 0) + +/* + * Generate a routing message when inserting or deleting + * an interface address alias. + */ +static void in_addralias_rtmsg(int cmd, struct in_addr *prefix, + struct in_ifaddr *target) +{ + struct route pfx_ro; + struct sockaddr_in *pfx_addr; + struct rtentry msg_rt; + + /* QL: XXX + * This is a bit questionable because there is no + * additional route entry added/deleted for an address + * alias. Therefore this route report is inaccurate. + */ + bzero(&pfx_ro, sizeof(pfx_ro)); + pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst); + pfx_addr->sin_len = sizeof(*pfx_addr); + pfx_addr->sin_family = AF_INET; + pfx_addr->sin_addr = *prefix; + rtalloc_ign_fib(&pfx_ro, 0, 0); + if (pfx_ro.ro_rt != NULL) { + msg_rt = *pfx_ro.ro_rt; + + /* QL: XXX + * Point the gateway to the new interface + * address as if a new prefix route entry has + * been added through the new address alias. + * All other parts of the rtentry is accurate, + * e.g., rt_key, rt_mask, rt_ifp etc. + */ + msg_rt.rt_gateway = (struct sockaddr *)&target->ia_addr; + rt_newaddrmsg(cmd, (struct ifaddr *)target, 0, &msg_rt); + RTFREE(pfx_ro.ro_rt); + } + return; +} + +/* + * Check if we have a route for the given prefix already or add one accordingly. + */ +int +in_addprefix(struct in_ifaddr *target, int flags) +{ + struct in_ifaddr *ia; + struct in_addr prefix, mask, p, m; + int error; + + if ((flags & RTF_HOST) != 0) { + prefix = target->ia_dstaddr.sin_addr; + mask.s_addr = 0; + } else { + prefix = target->ia_addr.sin_addr; + mask = target->ia_sockmask.sin_addr; + prefix.s_addr &= mask.s_addr; + } + + IN_IFADDR_RLOCK(); + TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { + if (rtinitflags(ia)) { + p = ia->ia_dstaddr.sin_addr; + + if (prefix.s_addr != p.s_addr) + continue; + } else { + p = ia->ia_addr.sin_addr; + m = ia->ia_sockmask.sin_addr; + p.s_addr &= m.s_addr; + + if (prefix.s_addr != p.s_addr || + mask.s_addr != m.s_addr) + continue; + } + + /* + * If we got a matching prefix route inserted by other + * interface address, we are done here. + */ + if (ia->ia_flags & IFA_ROUTE) { +#ifdef RADIX_MPATH + if (ia->ia_addr.sin_addr.s_addr == + target->ia_addr.sin_addr.s_addr) { + IN_IFADDR_RUNLOCK(); + return (EEXIST); + } else + break; +#endif + if (V_nosameprefix) { + IN_IFADDR_RUNLOCK(); + return (EEXIST); + } else { + in_addralias_rtmsg(RTM_ADD, &prefix, target); + IN_IFADDR_RUNLOCK(); + return (0); + } + } + } + IN_IFADDR_RUNLOCK(); + + /* + * No-one seem to have this prefix route, so we try to insert it. + */ + error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); + if (!error) + target->ia_flags |= IFA_ROUTE; + return (error); +} + +/* + * If there is no other address in the system that can serve a route to the + * same prefix, remove the route. Hand over the route to the new address + * otherwise. + */ +int +in_scrubprefix(struct in_ifaddr *target, u_int flags) +{ + struct in_ifaddr *ia; + struct in_addr prefix, mask, p, m; + int error = 0; + struct sockaddr_in prefix0, mask0; + + /* + * Remove the loopback route to the interface address. + * The "useloopback" setting is not consulted because if the + * user configures an interface address, turns off this + * setting, and then tries to delete that interface address, + * checking the current setting of "useloopback" would leave + * that interface address loopback route untouched, which + * would be wrong. Therefore the interface address loopback route + * deletion is unconditional. + */ + if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && + !(target->ia_ifp->if_flags & IFF_LOOPBACK) && + (target->ia_flags & IFA_RTSELF)) { + struct route ia_ro; + int freeit = 0; + + bzero(&ia_ro, sizeof(ia_ro)); + *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr; + rtalloc_ign_fib(&ia_ro, 0, 0); + if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && + (ia_ro.ro_rt->rt_ifp == V_loif)) { + RT_LOCK(ia_ro.ro_rt); + if (ia_ro.ro_rt->rt_refcnt <= 1) + freeit = 1; + else if (flags & LLE_STATIC) { + RT_REMREF(ia_ro.ro_rt); + target->ia_flags &= ~IFA_RTSELF; + } + RTFREE_LOCKED(ia_ro.ro_rt); + } + if (freeit && (flags & LLE_STATIC)) { + error = ifa_del_loopback_route((struct ifaddr *)target, + (struct sockaddr *)&target->ia_addr); + if (error == 0) + target->ia_flags &= ~IFA_RTSELF; + } + if ((flags & LLE_STATIC) && + !(target->ia_ifp->if_flags & IFF_NOARP)) + /* remove arp cache */ + arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); + } + + if (rtinitflags(target)) { + prefix = target->ia_dstaddr.sin_addr; + mask.s_addr = 0; + } else { + prefix = target->ia_addr.sin_addr; + mask = target->ia_sockmask.sin_addr; + prefix.s_addr &= mask.s_addr; + } + + if ((target->ia_flags & IFA_ROUTE) == 0) { + in_addralias_rtmsg(RTM_DELETE, &prefix, target); + return (0); + } + + IN_IFADDR_RLOCK(); + TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { + if (rtinitflags(ia)) { + p = ia->ia_dstaddr.sin_addr; + + if (prefix.s_addr != p.s_addr) + continue; + } else { + p = ia->ia_addr.sin_addr; + m = ia->ia_sockmask.sin_addr; + p.s_addr &= m.s_addr; + + if (prefix.s_addr != p.s_addr || + mask.s_addr != m.s_addr) + continue; + } + + if ((ia->ia_ifp->if_flags & IFF_UP) == 0) + continue; + + /* + * If we got a matching prefix address, move IFA_ROUTE and + * the route itself to it. Make sure that routing daemons + * get a heads-up. + */ + if ((ia->ia_flags & IFA_ROUTE) == 0) { + ifa_ref(&ia->ia_ifa); + IN_IFADDR_RUNLOCK(); + error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, + rtinitflags(target)); + if (error == 0) + target->ia_flags &= ~IFA_ROUTE; + else + log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", + error); + error = rtinit(&ia->ia_ifa, (int)RTM_ADD, + rtinitflags(ia) | RTF_UP); + if (error == 0) + ia->ia_flags |= IFA_ROUTE; + else + log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", + error); + ifa_free(&ia->ia_ifa); + return (error); + } + } + IN_IFADDR_RUNLOCK(); + + /* + * remove all L2 entries on the given prefix + */ + bzero(&prefix0, sizeof(prefix0)); + prefix0.sin_len = sizeof(prefix0); + prefix0.sin_family = AF_INET; + prefix0.sin_addr.s_addr = target->ia_subnet; + bzero(&mask0, sizeof(mask0)); + mask0.sin_len = sizeof(mask0); + mask0.sin_family = AF_INET; + mask0.sin_addr.s_addr = target->ia_subnetmask; + lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, + (struct sockaddr *)&mask0, flags); + + /* + * As no-one seem to have this prefix, we can remove the route. + */ + error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); + if (error == 0) + target->ia_flags &= ~IFA_ROUTE; + else + log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); + return (error); +} + +#undef rtinitflags + +/* + * Return 1 if the address might be a local broadcast address. + */ +int +in_broadcast(struct in_addr in, struct ifnet *ifp) +{ + register struct ifaddr *ifa; + u_long t; + + if (in.s_addr == INADDR_BROADCAST || + in.s_addr == INADDR_ANY) + return (1); + if ((ifp->if_flags & IFF_BROADCAST) == 0) + return (0); + t = ntohl(in.s_addr); + /* + * Look through the list of addresses for a match + * with a broadcast address. + */ +#define ia ((struct in_ifaddr *)ifa) + TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) + if (ifa->ifa_addr->sa_family == AF_INET && + (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || + /* + * Check for old-style (host 0) broadcast, but + * taking into account that RFC 3021 obsoletes it. + */ + (ia->ia_subnetmask != IN_RFC3021_MASK && + t == ia->ia_subnet)) && + /* + * Check for an all one subnetmask. These + * only exist when an interface gets a secondary + * address. + */ + ia->ia_subnetmask != (u_long)0xffffffff) + return (1); + return (0); +#undef ia +} + +/* + * On interface removal, clean up IPv4 data structures hung off of the ifnet. + */ +void +in_ifdetach(struct ifnet *ifp) +{ + + in_pcbpurgeif0(&V_ripcbinfo, ifp); + in_pcbpurgeif0(&V_udbinfo, ifp); + in_purgemaddrs(ifp); +} + +/* + * Delete all IPv4 multicast address records, and associated link-layer + * multicast address records, associated with ifp. + * XXX It looks like domifdetach runs AFTER the link layer cleanup. + * XXX This should not race with ifma_protospec being set during + * a new allocation, if it does, we have bigger problems. + */ +static void +in_purgemaddrs(struct ifnet *ifp) +{ + LIST_HEAD(,in_multi) purgeinms; + struct in_multi *inm, *tinm; + struct ifmultiaddr *ifma; + + LIST_INIT(&purgeinms); + IN_MULTI_LOCK(); + + /* + * Extract list of in_multi associated with the detaching ifp + * which the PF_INET layer is about to release. + * We need to do this as IF_ADDR_LOCK() may be re-acquired + * by code further down. + */ + IF_ADDR_RLOCK(ifp); + TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { + if (ifma->ifma_addr->sa_family != AF_INET || + ifma->ifma_protospec == NULL) + continue; +#if 0 + KASSERT(ifma->ifma_protospec != NULL, + ("%s: ifma_protospec is NULL", __func__)); +#endif + inm = (struct in_multi *)ifma->ifma_protospec; + LIST_INSERT_HEAD(&purgeinms, inm, inm_link); + } + IF_ADDR_RUNLOCK(ifp); + + LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { + LIST_REMOVE(inm, inm_link); + inm_release_locked(inm); + } + igmp_ifdetach(ifp); + + IN_MULTI_UNLOCK(); +} + +struct in_llentry { + struct llentry base; + struct sockaddr_in l3_addr4; +}; + +/* + * Deletes an address from the address table. + * This function is called by the timer functions + * such as arptimer() and nd6_llinfo_timer(), and + * the caller does the locking. + */ +static void +in_lltable_free(struct lltable *llt, struct llentry *lle) +{ + LLE_WUNLOCK(lle); + LLE_LOCK_DESTROY(lle); + free(lle, M_LLTABLE); +} + +static struct llentry * +in_lltable_new(const struct sockaddr *l3addr, u_int flags) +{ + struct in_llentry *lle; + + lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); + if (lle == NULL) /* NB: caller generates msg */ + return NULL; + + /* + * For IPv4 this will trigger "arpresolve" to generate + * an ARP request. + */ + lle->base.la_expire = time_uptime; /* mark expired */ + lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; + lle->base.lle_refcnt = 1; + lle->base.lle_free = in_lltable_free; + LLE_LOCK_INIT(&lle->base); + callout_init_rw(&lle->base.la_timer, &lle->base.lle_lock, + CALLOUT_RETURNUNLOCKED); + + return (&lle->base); +} + +#define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ + (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) + +static void +in_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, + const struct sockaddr *mask, u_int flags) +{ + const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; + const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; + struct llentry *lle, *next; + int i; + size_t pkts_dropped; + + IF_AFDATA_WLOCK(llt->llt_ifp); + for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { + LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { + /* + * (flags & LLE_STATIC) means deleting all entries + * including static ARP entries. + */ + if (IN_ARE_MASKED_ADDR_EQUAL(satosin(L3_ADDR(lle)), + pfx, msk) && ((flags & LLE_STATIC) || + !(lle->la_flags & LLE_STATIC))) { + LLE_WLOCK(lle); + if (callout_stop(&lle->la_timer)) + LLE_REMREF(lle); + pkts_dropped = llentry_free(lle); + ARPSTAT_ADD(dropped, pkts_dropped); + } + } + } + IF_AFDATA_WUNLOCK(llt->llt_ifp); +} + + +static int +in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) +{ + struct rtentry *rt; + + KASSERT(l3addr->sa_family == AF_INET, + ("sin_family %d", l3addr->sa_family)); + + /* XXX rtalloc1 should take a const param */ + rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); + + if (rt == NULL) + return (EINVAL); + + /* + * If the gateway for an existing host route matches the target L3 + * address, which is a special route inserted by some implementation + * such as MANET, and the interface is of the correct type, then + * allow for ARP to proceed. + */ + if (rt->rt_flags & RTF_GATEWAY) { + if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp || + rt->rt_ifp->if_type != IFT_ETHER || + (rt->rt_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 || + memcmp(rt->rt_gateway->sa_data, l3addr->sa_data, + sizeof(in_addr_t)) != 0) { + RTFREE_LOCKED(rt); + return (EINVAL); + } + } + + /* + * Make sure that at least the destination address is covered + * by the route. This is for handling the case where 2 or more + * interfaces have the same prefix. An incoming packet arrives + * on one interface and the corresponding outgoing packet leaves + * another interface. + */ + if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) { + const char *sa, *mask, *addr, *lim; + int len; + + mask = (const char *)rt_mask(rt); + /* + * Just being extra cautious to avoid some custom + * code getting into trouble. + */ + if (mask == NULL) { + RTFREE_LOCKED(rt); + return (EINVAL); + } + + sa = (const char *)rt_key(rt); + addr = (const char *)l3addr; + len = ((const struct sockaddr_in *)l3addr)->sin_len; + lim = addr + len; + + for ( ; addr < lim; sa++, mask++, addr++) { + if ((*sa ^ *addr) & *mask) { +#ifdef DIAGNOSTIC + log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", + inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); +#endif + RTFREE_LOCKED(rt); + return (EINVAL); + } + } + } + + RTFREE_LOCKED(rt); + return (0); +} + +/* + * Return NULL if not found or marked for deletion. + * If found return lle read locked. + */ +static struct llentry * +in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) +{ + const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; + struct ifnet *ifp = llt->llt_ifp; + struct llentry *lle; + struct llentries *lleh; + u_int hashkey; + + IF_AFDATA_LOCK_ASSERT(ifp); + KASSERT(l3addr->sa_family == AF_INET, + ("sin_family %d", l3addr->sa_family)); + + hashkey = sin->sin_addr.s_addr; + lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; + LIST_FOREACH(lle, lleh, lle_next) { + struct sockaddr_in *sa2 = satosin(L3_ADDR(lle)); + if (lle->la_flags & LLE_DELETED) + continue; + if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) + break; + } + if (lle == NULL) { +#ifdef DIAGNOSTIC + if (flags & LLE_DELETE) + log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); +#endif + if (!(flags & LLE_CREATE)) + return (NULL); + /* + * A route that covers the given address must have + * been installed 1st because we are doing a resolution, + * verify this. + */ + if (!(flags & LLE_IFADDR) && + in_lltable_rtcheck(ifp, flags, l3addr) != 0) + goto done; + + lle = in_lltable_new(l3addr, flags); + if (lle == NULL) { + log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); + goto done; + } + lle->la_flags = flags & ~LLE_CREATE; + if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { + bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); + lle->la_flags |= (LLE_VALID | LLE_STATIC); + } + + lle->lle_tbl = llt; + lle->lle_head = lleh; + lle->la_flags |= LLE_LINKED; + LIST_INSERT_HEAD(lleh, lle, lle_next); + } else if (flags & LLE_DELETE) { + if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { + LLE_WLOCK(lle); + lle->la_flags |= LLE_DELETED; + EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); + LLE_WUNLOCK(lle); +#ifdef DIAGNOSTIC + log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); +#endif + } + lle = (void *)-1; + + } + if (LLE_IS_VALID(lle)) { + if (flags & LLE_EXCLUSIVE) + LLE_WLOCK(lle); + else + LLE_RLOCK(lle); + } +done: + return (lle); +} + +static int +in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) +{ +#define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) + struct ifnet *ifp = llt->llt_ifp; + struct llentry *lle; + /* XXX stack use */ + struct { + struct rt_msghdr rtm; + struct sockaddr_in sin; + struct sockaddr_dl sdl; + } arpc; + int error, i; + + LLTABLE_LOCK_ASSERT(); + + error = 0; + for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { + LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { + struct sockaddr_dl *sdl; + + /* skip deleted entries */ + if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) + continue; + /* Skip if jailed and not a valid IP of the prison. */ + if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) + continue; + /* + * produce a msg made of: + * struct rt_msghdr; + * struct sockaddr_in; (IPv4) + * struct sockaddr_dl; + */ + bzero(&arpc, sizeof(arpc)); + arpc.rtm.rtm_msglen = sizeof(arpc); + arpc.rtm.rtm_version = RTM_VERSION; + arpc.rtm.rtm_type = RTM_GET; + arpc.rtm.rtm_flags = RTF_UP; + arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; + arpc.sin.sin_family = AF_INET; + arpc.sin.sin_len = sizeof(arpc.sin); + arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; + + /* publish */ + if (lle->la_flags & LLE_PUB) + arpc.rtm.rtm_flags |= RTF_ANNOUNCE; + + sdl = &arpc.sdl; + sdl->sdl_family = AF_LINK; + sdl->sdl_len = sizeof(*sdl); + sdl->sdl_index = ifp->if_index; + sdl->sdl_type = ifp->if_type; + if ((lle->la_flags & LLE_VALID) == LLE_VALID) { + sdl->sdl_alen = ifp->if_addrlen; + bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); + } else { + sdl->sdl_alen = 0; + bzero(LLADDR(sdl), ifp->if_addrlen); + } + + arpc.rtm.rtm_rmx.rmx_expire = + lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; + arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); + if (lle->la_flags & LLE_STATIC) + arpc.rtm.rtm_flags |= RTF_STATIC; + arpc.rtm.rtm_index = ifp->if_index; + error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); + if (error) + break; + } + } + return error; +#undef SIN +} + +void * +in_domifattach(struct ifnet *ifp) +{ + struct in_ifinfo *ii; + struct lltable *llt; + + ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); + + llt = lltable_init(ifp, AF_INET); + if (llt != NULL) { + llt->llt_prefix_free = in_lltable_prefix_free; + llt->llt_lookup = in_lltable_lookup; + llt->llt_dump = in_lltable_dump; + } + ii->ii_llt = llt; + + ii->ii_igmp = igmp_domifattach(ifp); + + return ii; +} + +void +in_domifdetach(struct ifnet *ifp, void *aux) +{ + struct in_ifinfo *ii = (struct in_ifinfo *)aux; + + igmp_domifdetach(ifp); + lltable_free(ii->ii_llt); + free(ii, M_IFADDR); +} |
