#if NOTFB31
#include "opt_inet.h"
#include "opt_bdg.h"
#endif
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/netisr.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#define SIN(s) ((struct sockaddr_in *)s)
#define SDL(s) ((struct sockaddr_dl *)s)
SYSCTL_DECL(_net_link_ether);
SYSCTL_NODE(_net_link_ether, PF_INET, inet, CTLFLAG_RW, 0, "");
static int arpt_prune = (5*60*1);
static int arpt_keep = (20*60);
static int arpt_down = 20;
int apple_hwcksum_tx = 1;
int apple_hwcksum_rx = 1;
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, prune_intvl, CTLFLAG_RW,
&arpt_prune, 0, "");
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, max_age, CTLFLAG_RW,
&arpt_keep, 0, "");
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, host_down_time, CTLFLAG_RW,
&arpt_down, 0, "");
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, apple_hwcksum_tx, CTLFLAG_RW,
&apple_hwcksum_tx, 0, "");
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, apple_hwcksum_rx, CTLFLAG_RW,
&apple_hwcksum_rx, 0, "");
#define rt_expire rt_rmx.rmx_expire
struct llinfo_arp {
LIST_ENTRY(llinfo_arp) la_le;
struct rtentry *la_rt;
struct mbuf *la_hold;
long la_asked;
#define la_timer la_rt->rt_rmx.rmx_expire
};
static LIST_HEAD(, llinfo_arp) llinfo_arp;
struct ifqueue arpintrq = {0, 0, 0, 50};
static int arp_inuse, arp_allocated;
static int arp_maxtries = 5;
static int useloopback = 1;
static int arp_proxyall = 0;
static int arp_init_called = 0;
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, maxtries, CTLFLAG_RW,
&arp_maxtries, 0, "");
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, useloopback, CTLFLAG_RW,
&useloopback, 0, "");
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, proxyall, CTLFLAG_RW,
&arp_proxyall, 0, "");
void arp_rtrequest __P((int, struct rtentry *, struct sockaddr *));
static void arprequest __P((struct arpcom *,
struct in_addr *, struct in_addr *, u_char *));
void arpintr __P((void));
static void arptfree __P((struct llinfo_arp *));
static void arptimer __P((void *));
static u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
static struct llinfo_arp
*arplookup __P((u_long, int, int));
#if INET
static void in_arpinput __P((struct mbuf *));
#endif
static void
arptimer(ignored_arg)
void *ignored_arg;
{
int s ;
register struct llinfo_arp *la;
struct llinfo_arp *ola;
boolean_t funnel_state;
funnel_state = thread_funnel_set(network_flock, TRUE);
s = splnet();
la = llinfo_arp.lh_first;
timeout(arptimer, (caddr_t)0, arpt_prune * hz);
while ((ola = la) != 0) {
register struct rtentry *rt = la->la_rt;
la = la->la_le.le_next;
if (rt->rt_expire && rt->rt_expire <= time_second)
arptfree(ola);
}
splx(s);
(void) thread_funnel_set(network_flock, FALSE);
}
void
arp_rtrequest(req, rt, sa)
int req;
register struct rtentry *rt;
struct sockaddr *sa;
{
register struct sockaddr *gate = rt->rt_gateway;
register struct llinfo_arp *la = (struct llinfo_arp *)rt->rt_llinfo;
static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
static int arpinit_done;
if (!arpinit_done) {
arpinit_done = 1;
LIST_INIT(&llinfo_arp);
timeout(arptimer, (caddr_t)0, hz);
}
if (rt->rt_flags & RTF_GATEWAY)
return;
switch (req) {
case RTM_ADD:
if ((rt->rt_flags & RTF_HOST) == 0 &&
SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
rt->rt_flags |= RTF_CLONING;
if (rt->rt_flags & RTF_CLONING) {
rt_setgate(rt, rt_key(rt),
(struct sockaddr *)&null_sdl);
gate = rt->rt_gateway;
SDL(gate)->sdl_type = rt->rt_ifp->if_type;
SDL(gate)->sdl_index = rt->rt_ifp->if_index;
rt->rt_expire = time_second;
break;
}
if (rt->rt_flags & RTF_ANNOUNCE)
arprequest((struct arpcom *)rt->rt_ifp,
&SIN(rt_key(rt))->sin_addr,
&SIN(rt_key(rt))->sin_addr,
(u_char *)LLADDR(SDL(gate)));
case RTM_RESOLVE:
if (gate->sa_family != AF_LINK ||
gate->sa_len < sizeof(null_sdl)) {
log(LOG_DEBUG, "arp_rtrequest: bad gateway value\n");
break;
}
SDL(gate)->sdl_type = rt->rt_ifp->if_type;
SDL(gate)->sdl_index = rt->rt_ifp->if_index;
if (la != 0)
break;
R_Malloc(la, struct llinfo_arp *, sizeof(*la));
rt->rt_llinfo = (caddr_t)la;
if (la == 0) {
log(LOG_DEBUG, "arp_rtrequest: malloc failed\n");
break;
}
arp_inuse++, arp_allocated++;
Bzero(la, sizeof(*la));
la->la_rt = rt;
rt->rt_flags |= RTF_LLINFO;
LIST_INSERT_HEAD(&llinfo_arp, la, la_le);
#if INET
if (IN_MULTICAST(ntohl(SIN(rt_key(rt))->sin_addr.s_addr))) {
ETHER_MAP_IP_MULTICAST(&SIN(rt_key(rt))->sin_addr,
LLADDR(SDL(gate)));
SDL(gate)->sdl_alen = 6;
rt->rt_expire = 0;
}
if (in_broadcast(SIN(rt_key(rt))->sin_addr, rt->rt_ifp)) {
memcpy(LLADDR(SDL(gate)), etherbroadcastaddr, 6);
SDL(gate)->sdl_alen = 6;
rt->rt_expire = 0;
}
#endif
if (SIN(rt_key(rt))->sin_addr.s_addr ==
(IA_SIN(rt->rt_ifa))->sin_addr.s_addr) {
rt->rt_expire = 0;
Bcopy(((struct arpcom *)rt->rt_ifp)->ac_enaddr,
LLADDR(SDL(gate)), SDL(gate)->sdl_alen = 6);
if (useloopback)
rt->rt_ifp = loif;
}
break;
case RTM_DELETE:
if (la == 0)
break;
arp_inuse--;
LIST_REMOVE(la, la_le);
rt->rt_llinfo = 0;
rt->rt_flags &= ~RTF_LLINFO;
if (la->la_hold)
m_freem(la->la_hold);
Free((caddr_t)la);
}
}
void
arpwhohas(ac, addr)
register struct arpcom *ac;
register struct in_addr *addr;
{ struct ifnet *ifp = (struct ifnet *)ac;
struct ifaddr *ifa = TAILQ_FIRST(&ifp->if_addrhead);
while (ifa)
{ if (ifa->ifa_addr->sa_family == AF_INET)
{ arprequest(ac, &SIN(ifa->ifa_addr)->sin_addr, addr, ac->ac_enaddr);
return;
}
ifa = TAILQ_NEXT(ifa, ifa_link);
}
return;
}
static void
arprequest(ac, sip, tip, enaddr)
register struct arpcom *ac;
register struct in_addr *sip, *tip;
register u_char *enaddr;
{
register struct mbuf *m;
register struct ether_header *eh;
register struct ether_arp *ea;
struct sockaddr sa;
if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL)
return;
m->m_len = sizeof(*ea);
m->m_pkthdr.len = sizeof(*ea);
m->m_pkthdr.rcvif = (struct ifnet *)0;
MH_ALIGN(m, sizeof(*ea));
ea = mtod(m, struct ether_arp *);
eh = (struct ether_header *)sa.sa_data;
bzero((caddr_t)ea, sizeof (*ea));
(void)memcpy(eh->ether_dhost, etherbroadcastaddr, sizeof(eh->ether_dhost));
eh->ether_type = htons(ETHERTYPE_ARP);
ea->arp_hrd = htons(ARPHRD_ETHER);
ea->arp_pro = htons(ETHERTYPE_IP);
ea->arp_hln = sizeof(ea->arp_sha);
ea->arp_pln = sizeof(ea->arp_spa);
ea->arp_op = htons(ARPOP_REQUEST);
(void)memcpy(ea->arp_sha, enaddr, sizeof(ea->arp_sha));
(void)memcpy(ea->arp_spa, sip, sizeof(ea->arp_spa));
(void)memcpy(ea->arp_tpa, tip, sizeof(ea->arp_tpa));
sa.sa_family = AF_UNSPEC;
sa.sa_len = sizeof(sa);
dlil_output((u_long) ac, m, 0, &sa, 0);
}
int
arpresolve(ac, rt, m, dst, desten, rt0)
register struct arpcom *ac;
register struct rtentry *rt;
struct mbuf *m;
register struct sockaddr *dst;
register u_char *desten;
struct rtentry *rt0;
{
register struct llinfo_arp *la = 0;
struct sockaddr_dl *sdl;
if (m->m_flags & M_BCAST) {
(void)memcpy(desten, etherbroadcastaddr, sizeof(etherbroadcastaddr));
return (1);
}
if (m->m_flags & M_MCAST) {
ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, desten);
return(1);
}
if (rt)
la = (struct llinfo_arp *)rt->rt_llinfo;
if (la == 0) {
la = arplookup(SIN(dst)->sin_addr.s_addr, 1, 0);
if (la)
rt = la->la_rt;
}
if (la == 0 || rt == 0) {
log(LOG_DEBUG, "arpresolve: can't allocate llinfo for %s%s%s\n",
inet_ntoa(SIN(dst)->sin_addr), la ? "la" : "",
rt ? "rt" : "");
m_freem(m);
return (0);
}
sdl = SDL(rt->rt_gateway);
if ((rt->rt_expire == 0 || rt->rt_expire > time_second) &&
sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0) {
bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
return 1;
}
if (la->la_hold)
m_freem(la->la_hold);
la->la_hold = m;
if (rt->rt_expire) {
rt->rt_flags &= ~RTF_REJECT;
if (la->la_asked == 0 || rt->rt_expire != time_second) {
rt->rt_expire = time_second;
if (la->la_asked++ < arp_maxtries)
arprequest(ac,
&SIN(rt->rt_ifa->ifa_addr)->sin_addr,
&SIN(dst)->sin_addr, ac->ac_enaddr);
else {
rt->rt_flags |= RTF_REJECT;
rt->rt_expire += arpt_down;
la->la_asked = 0;
}
}
}
return (0);
}
void
arpintr()
{
register struct mbuf *m;
register struct arphdr *ar;
int s;
while (arpintrq.ifq_head) {
s = splimp();
IF_DEQUEUE(&arpintrq, m);
splx(s);
if (m == 0 || (m->m_flags & M_PKTHDR) == 0)
panic("arpintr");
if (m->m_len >= sizeof(struct arphdr) &&
(ar = mtod(m, struct arphdr *)) &&
ntohs(ar->ar_hrd) == ARPHRD_ETHER &&
m->m_len >=
sizeof(struct arphdr) + 2 * ar->ar_hln + 2 * ar->ar_pln)
switch (ntohs(ar->ar_pro)) {
#if INET
case ETHERTYPE_IP:
in_arpinput(m);
continue;
#endif
}
m_freem(m);
}
}
NETISR_SET(NETISR_ARP, arpintr);
#if INET
static void
in_arpinput(m)
struct mbuf *m;
{
register struct ether_arp *ea;
register struct arpcom *ac = (struct arpcom *)m->m_pkthdr.rcvif;
struct ether_header *eh;
register struct llinfo_arp *la = 0;
register struct rtentry *rt;
struct in_ifaddr *ia, *maybe_ia = 0;
struct sockaddr_dl *sdl;
struct sockaddr sa;
struct in_addr isaddr, itaddr, myaddr;
int op;
unsigned char buf[18];
ea = mtod(m, struct ether_arp *);
op = ntohs(ea->arp_op);
(void)memcpy(&isaddr, ea->arp_spa, sizeof (isaddr));
(void)memcpy(&itaddr, ea->arp_tpa, sizeof (itaddr));
if (itaddr.s_addr == 0 && op == ARPOP_REQUEST) {
m_freem(m);
return;
}
for (ia = in_ifaddrhead.tqh_first; ia; ia = ia->ia_link.tqe_next)
#if BRIDGE
{
#else
if (ia->ia_ifp == &ac->ac_if) {
#endif
maybe_ia = ia;
if ((itaddr.s_addr == ia->ia_addr.sin_addr.s_addr) ||
(isaddr.s_addr == ia->ia_addr.sin_addr.s_addr))
break;
}
if (maybe_ia == 0) {
m_freem(m);
return;
}
myaddr = ia ? ia->ia_addr.sin_addr : maybe_ia->ia_addr.sin_addr;
if (!bcmp((caddr_t)ea->arp_sha, (caddr_t)etherbroadcastaddr,
sizeof (ea->arp_sha))) {
log(LOG_ERR,
"arp: ether address is broadcast for IP address %s!\n",
inet_ntoa(isaddr));
m_freem(m);
return;
}
if (isaddr.s_addr == myaddr.s_addr) {
log(LOG_ERR,
"duplicate IP address %s sent from ethernet address %s\n",
inet_ntoa(isaddr), ether_sprintf(buf, ea->arp_sha));
itaddr = myaddr;
goto reply;
}
la = arplookup(isaddr.s_addr, itaddr.s_addr == myaddr.s_addr, 0);
if (la && (rt = la->la_rt) && (sdl = SDL(rt->rt_gateway))) {
#ifndef BRIDGE
if (rt->rt_ifp != &ac->ac_if) {
log(LOG_ERR, "arp: %s is on %s%d but got reply from %6D on %s%d\n",
inet_ntoa(isaddr),
rt->rt_ifp->if_name, rt->rt_ifp->if_unit,
ea->arp_sha, ":",
ac->ac_if.if_name, ac->ac_if.if_unit);
goto reply;
}
#endif
if (sdl->sdl_alen &&
bcmp((caddr_t)ea->arp_sha, LLADDR(sdl), sdl->sdl_alen))
if (rt->rt_expire)
log(LOG_INFO, "arp: %s moved from %6D to %6D on %s%d\n",
inet_ntoa(isaddr), (u_char *)LLADDR(sdl), ":",
ea->arp_sha, ":",
ac->ac_if.if_name, ac->ac_if.if_unit);
else {
log(LOG_ERR,
"arp: %6D attempts to modify permanent entry for %s on %s%d",
ea->arp_sha, ":", inet_ntoa(isaddr),
ac->ac_if.if_name, ac->ac_if.if_unit);
goto reply;
}
(void)memcpy(LLADDR(sdl), ea->arp_sha, sizeof(ea->arp_sha));
sdl->sdl_alen = sizeof(ea->arp_sha);
if (rt->rt_expire)
rt->rt_expire = time_second + arpt_keep;
rt->rt_flags &= ~RTF_REJECT;
la->la_asked = 0;
if (la->la_hold) {
dlil_output((u_long) ac, la->la_hold, rt,
rt_key(rt), 0);
la->la_hold = 0;
}
}
reply:
if (op != ARPOP_REQUEST) {
m_freem(m);
return;
}
if (itaddr.s_addr == myaddr.s_addr) {
(void)memcpy(ea->arp_tha, ea->arp_sha, sizeof(ea->arp_sha));
(void)memcpy(ea->arp_sha, ac->ac_enaddr, sizeof(ea->arp_sha));
} else {
la = arplookup(itaddr.s_addr, 0, SIN_PROXY);
if (la == NULL) {
struct sockaddr_in sin;
if (!arp_proxyall) {
m_freem(m);
return;
}
bzero(&sin, sizeof sin);
sin.sin_family = AF_INET;
sin.sin_len = sizeof sin;
sin.sin_addr = itaddr;
rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
if (!rt) {
m_freem(m);
return;
}
if (rt->rt_ifp == &ac->ac_if) {
rtfree(rt);
m_freem(m);
return;
}
(void)memcpy(ea->arp_tha, ea->arp_sha, sizeof(ea->arp_sha));
(void)memcpy(ea->arp_sha, ac->ac_enaddr, sizeof(ea->arp_sha));
rtfree(rt);
#if DEBUG_PROXY
printf("arp: proxying for %s\n",
inet_ntoa(itaddr));
#endif
} else {
rt = la->la_rt;
(void)memcpy(ea->arp_tha, ea->arp_sha, sizeof(ea->arp_sha));
sdl = SDL(rt->rt_gateway);
(void)memcpy(ea->arp_sha, LLADDR(sdl), sizeof(ea->arp_sha));
}
}
(void)memcpy(ea->arp_tpa, ea->arp_spa, sizeof(ea->arp_spa));
(void)memcpy(ea->arp_spa, &itaddr, sizeof(ea->arp_spa));
ea->arp_op = htons(ARPOP_REPLY);
ea->arp_pro = htons(ETHERTYPE_IP);
eh = (struct ether_header *)sa.sa_data;
if (IN_LINKLOCAL(ntohl(*((u_int32_t*)ea->arp_spa))))
(void)memcpy(eh->ether_dhost, etherbroadcastaddr, sizeof(eh->ether_dhost));
else
(void)memcpy(eh->ether_dhost, ea->arp_tha, sizeof(eh->ether_dhost));
eh->ether_type = htons(ETHERTYPE_ARP);
sa.sa_family = AF_UNSPEC;
sa.sa_len = sizeof(sa);
dlil_output((u_long) ac, m, 0, &sa, 0);
return;
}
#endif
static void
arptfree(la)
register struct llinfo_arp *la;
{
register struct rtentry *rt = la->la_rt;
register struct sockaddr_dl *sdl;
if (rt == 0)
panic("arptfree");
if (rt->rt_refcnt > 0 && (sdl = SDL(rt->rt_gateway)) &&
sdl->sdl_family == AF_LINK) {
sdl->sdl_alen = 0;
la->la_asked = 0;
rt->rt_flags &= ~RTF_REJECT;
return;
}
rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0, rt_mask(rt),
0, (struct rtentry **)0);
}
static struct llinfo_arp *
arplookup(addr, create, proxy)
u_long addr;
int create, proxy;
{
register struct rtentry *rt;
static struct sockaddr_inarp sin = {sizeof(sin), AF_INET };
const char *why = 0;
sin.sin_addr.s_addr = addr;
sin.sin_other = proxy ? SIN_PROXY : 0;
rt = rtalloc1((struct sockaddr *)&sin, create, 0UL);
if (rt == 0)
return (0);
rt->rt_refcnt--;
if (rt->rt_flags & RTF_GATEWAY)
why = "host is not on local network";
else if ((rt->rt_flags & RTF_LLINFO) == 0)
why = "could not allocate llinfo";
else if (rt->rt_gateway->sa_family != AF_LINK)
why = "gateway route is not ours";
if (why && create) {
log(LOG_DEBUG, "arplookup %s failed: %s\n",
inet_ntoa(sin.sin_addr), why);
return 0;
} else if (why) {
return 0;
}
return ((struct llinfo_arp *)rt->rt_llinfo);
}
void
arp_ifinit(ac, ifa)
struct arpcom *ac;
struct ifaddr *ifa;
{
if (ntohl(IA_SIN(ifa)->sin_addr.s_addr) != INADDR_ANY)
arprequest(ac, &IA_SIN(ifa)->sin_addr,
&IA_SIN(ifa)->sin_addr, ac->ac_enaddr);
ifa->ifa_rtrequest = arp_rtrequest;
ifa->ifa_flags |= RTF_CLONING;
}