-/* if_ether.c 4.2 83/05/27 */
+/*
+ * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
+ * All rights reserved.
+ *
+ * %sccs.include.redist.c%
+ *
+ * @(#)if_ether.c 7.15 (Berkeley) %G%
+ */
/*
* Ethernet address resolution protocol.
+ * TODO:
+ * run at splnet (add ARP protocol intr.)
+ * link entries onto hash chains, keep free list
+ * add "inuse/lock" bit (or ref. count) along with valid bit
*/
-#include "../h/param.h"
-#include "../h/systm.h"
-#include "../h/mbuf.h"
-#include "../h/socket.h"
-#include "../h/time.h"
-#include "../h/kernel.h"
-#include "../h/errno.h"
+#include "param.h"
+#include "systm.h"
+#include "malloc.h"
+#include "mbuf.h"
+#include "socket.h"
+#include "time.h"
+#include "kernel.h"
+#include "errno.h"
+#include "ioctl.h"
+#include "syslog.h"
#include "../net/if.h"
-#include "../netinet/in.h"
-#include "../netinet/if_ether.h"
+#include "../net/if_dl.h"
+#include "../net/route.h"
+
+#include "in.h"
+#include "in_systm.h"
+#include "in_var.h"
+#include "ip.h"
+#include "if_ether.h"
+#define SIN(s) ((struct sockaddr_in *)s)
+#define SDL(s) ((struct sockaddr_dl *)s)
+#define SRP(s) ((struct sockaddr_inarp *)s)
/*
- * Internet to ethernet address resolution table.
+ * ARP trailer negotiation. Trailer protocol is not IP specific,
+ * but ARP request/response use IP addresses.
*/
-struct arptab {
- struct in_addr at_iaddr; /* internet address */
- u_char at_enaddr[6]; /* ethernet address */
- struct mbuf *at_hold; /* last packet until resolved/timeout */
- u_char at_timer; /* minutes since last reference */
- u_char at_flags; /* flags */
-};
-/* at_flags field values */
-#define ATF_INUSE 1 /* entry in use */
-#define ATF_COM 2 /* completed entry (enaddr valid) */
-
-#define ARPTAB_BSIZ 5 /* bucket size */
-#define ARPTAB_NB 19 /* number of buckets */
-#define ARPTAB_SIZE (ARPTAB_BSIZ * ARPTAB_NB)
-struct arptab arptab[ARPTAB_SIZE];
-
-#define ARPTAB_HASH(a) \
- ((short)((((a) >> 16) ^ (a)) & 0x7fff) % ARPTAB_NB)
-
-#define ARPTAB_LOOK(at,addr) { \
- register n; \
- at = &arptab[ARPTAB_HASH(addr) * ARPTAB_BSIZ]; \
- for (n = 0 ; n < ARPTAB_BSIZ ; n++,at++) \
- if (at->at_iaddr.s_addr == addr) \
- break; \
- if (n >= ARPTAB_BSIZ) \
- at = 0; }
-
-struct arpcom *arpcom; /* chain of active ether interfaces */
-int arpt_age; /* aging timer */
+#define ETHERTYPE_IPTRAILERS ETHERTYPE_TRAIL
+
/* timer values */
-#define ARPT_AGE (60*1) /* aging timer, 1 min. */
-#define ARPT_KILLC 20 /* kill completed entry in 20 mins. */
-#define ARPT_KILLI 3 /* kill incomplete entry in 3 minutes */
+int arpt_prune = (5*60*1); /* walk list every 5 minutes */
+int arpt_keep = (20*60); /* once resolved, good for 20 more minutes */
+int arpt_down = 20; /* once declared down, don't send for 20 secs */
+#define RTF_USETRAILERS RTF_PROTO1
+#define rt_expire rt_rmx.rmx_expire
-u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
extern struct ifnet loif;
-
-#define OLDMAP 1 /* if LNA > 1023 use old 3COM mapping */
+extern struct timeval time;
+struct llinfo_arp *arplookup(), llinfo_arp = {&llinfo_arp, &llinfo_arp};
+struct ifqueue arpintrq = {0, 0, 0, 50};
+int arp_inuse, arp_allocated, arp_intimer;
+int arp_maxtries = 5;
+int useloopback = 1; /* use loopback interface for local traffic */
+int arpinit_done = 0;
/*
- * Attach an ethernet interface to the list "arpcom" where
- * arptimer() can find it. If first time
- * initialization, start arptimer().
+ * Timeout routine. Age arp_tab entries periodically.
*/
-arpattach(ac)
- register struct arpcom *ac;
+arptimer()
{
- register struct arpcom *acp;
-
- for (acp = arpcom; acp != (struct arpcom *)0; acp = acp->ac_ac)
- if (acp == ac) /* if already on list */
- return;
- ac->ac_ac = arpcom;
- arpcom = ac;
- if (arpcom->ac_ac == 0) /* very first time */
- arptimer();
+ int s = splnet();
+ register struct llinfo_arp *la = llinfo_arp.la_next;
+
+ timeout(arptimer, (caddr_t)0, arpt_prune * hz);
+ while (la != &llinfo_arp) {
+ register struct rtentry *rt = la->la_rt;
+ la = la->la_next;
+ if (rt->rt_expire && rt->rt_expire <= time.tv_sec)
+ arptfree(la->la_prev); /* timer has expired, clear */
+ }
+ splx(s);
}
/*
- * Timeout routine. Age arp_tab entries once a minute.
+ * Parallel to llc_rtrequest.
*/
-arptimer()
+arp_rtrequest(req, rt, sa)
+ int req;
+ register struct rtentry *rt;
+ struct sockaddr *sa;
{
- register struct arptab *at;
- register i;
-
- timeout(arptimer, (caddr_t)0, hz);
-#ifdef notdef
- if (++arpt_sanity > ARPT_SANITY) {
- register struct arpcom *ac;
+ 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};
+ if (!arpinit_done) {
+ arpinit_done = 1;
+ timeout(arptimer, (caddr_t)0, hz);
+ }
+ if (rt->rt_flags & RTF_GATEWAY)
+ return;
+ switch (req) {
+ case RTM_ADD:
+ case RTM_RESOLVE:
+ if (rt->rt_flags & RTF_CLONING) {
+ /*
+ * Case 1: This route should come from a route to iface.
+ */
+ rt_setgate(rt, rt_key(rt), &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.tv_sec;
+ break;
+ }
+ if (gate->sa_family != AF_LINK ||
+ gate->sa_len < sizeof(null_sdl)) {
+ log(LOG_DEBUG, "arp_rtrequest: bad gateway value");
+ break;
+ }
+ SDL(gate)->sdl_type = rt->rt_ifp->if_type;
+ SDL(gate)->sdl_index = rt->rt_ifp->if_index;
+ if (la != 0)
+ break; /* This happens on a route change */
/*
- * Randomize sanity timer based on my host address.
- * Ask who has my own address; if someone else replies,
- * then they are impersonating me.
+ * Case 2: This route may come from cloning, or a manual route
+ * add with a LL address.
*/
- arpt_sanity = arpcom->ac_enaddr[5] & 0x3f;
- for (ac = arpcom; ac != (struct arpcom *)-1; ac = ac->ac_ac)
- arpwhohas(ac, &((struct sockaddr_in *)
- &ac->ac_if.if_addr)->sin_addr);
- }
-#endif
- if (++arpt_age > ARPT_AGE) {
- arpt_age = 0;
- at = &arptab[0];
- for (i = 0; i < ARPTAB_SIZE; i++, at++) {
- if (at->at_flags == 0)
- continue;
- if (++at->at_timer < ((at->at_flags&ATF_COM) ?
- ARPT_KILLC : ARPT_KILLI))
- continue;
- /* timer has expired, clear entry */
- arptfree(at);
+ 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;
+ insque(la, &llinfo_arp);
+ if (SIN(rt_key(rt))->sin_addr.s_addr ==
+ (IA_SIN(rt->rt_ifa))->sin_addr.s_addr) {
+ /*
+ * This test used to be
+ * if (loif.if_flags & IFF_UP)
+ * It allowed local traffic to be forced
+ * through the hardware by configuring the loopback down.
+ * However, it causes problems during network configuration
+ * for boards that can't receive packets they send.
+ * It is now necessary to clear "useloopback" and remove
+ * the route to force traffic out to the hardware.
+ */
+ 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--;
+ remque(la);
+ rt->rt_llinfo = 0;
+ rt->rt_flags &= ~RTF_LLINFO;
+ if (la->la_hold)
+ m_freem(la->la_hold);
+ Free((caddr_t)la);
}
}
*/
arpwhohas(ac, addr)
register struct arpcom *ac;
- struct in_addr *addr;
+ struct inaddr *addr;
{
register struct mbuf *m;
register struct ether_header *eh;
register struct ether_arp *ea;
struct sockaddr sa;
- if ((m = m_get(M_DONTWAIT, MT_DATA)) == NULL)
- return (ENOBUFS);
- m->m_len = sizeof *ea + sizeof *eh;
- m->m_off = MMAXOFF - m->m_len;
+ if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL)
+ return;
+ m->m_len = sizeof(*ea);
+ m->m_pkthdr.len = sizeof(*ea);
+ MH_ALIGN(m, sizeof(*ea));
ea = mtod(m, struct ether_arp *);
eh = (struct ether_header *)sa.sa_data;
bzero((caddr_t)ea, sizeof (*ea));
bcopy((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
- sizeof (etherbroadcastaddr));
- eh->ether_type = ETHERPUP_ARPTYPE; /* if_output will swap */
+ sizeof(eh->ether_dhost));
+ eh->ether_type = ETHERTYPE_ARP; /* if_output will swap */
ea->arp_hrd = htons(ARPHRD_ETHER);
- ea->arp_pro = htons(ETHERPUP_IPTYPE);
- ea->arp_hln = sizeof ea->arp_sha; /* hardware address length */
- ea->arp_pln = sizeof ea->arp_spa; /* protocol address length */
+ ea->arp_pro = htons(ETHERTYPE_IP);
+ ea->arp_hln = sizeof(ea->arp_sha); /* hardware address length */
+ ea->arp_pln = sizeof(ea->arp_spa); /* protocol address length */
ea->arp_op = htons(ARPOP_REQUEST);
bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->arp_sha,
- sizeof (ea->arp_sha));
- bcopy((caddr_t)&((struct sockaddr_in *)&ac->ac_if.if_addr)->sin_addr,
- (caddr_t)ea->arp_spa, sizeof (ea->arp_spa));
- bcopy((caddr_t)addr, (caddr_t)ea->arp_tpa, sizeof (ea->arp_tpa));
+ sizeof(ea->arp_sha));
+ bcopy((caddr_t)&ac->ac_ipaddr, (caddr_t)ea->arp_spa,
+ sizeof(ea->arp_spa));
+ bcopy((caddr_t)addr, (caddr_t)ea->arp_tpa, sizeof(ea->arp_tpa));
sa.sa_family = AF_UNSPEC;
- return ((*ac->ac_if.if_output)(&ac->ac_if, m, &sa));
+ sa.sa_len = sizeof(sa);
+ (*ac->ac_if.if_output)(&ac->ac_if, m, &sa, (struct rtentry *)0);
}
+int useloopback = 1; /* use loopback interface for local traffic */
+
/*
* Resolve an IP address into an ethernet address. If success,
- * desten is filled in and 1 is returned. If there is no entry
- * in arptab, set one up and broadcast a request
- * for the IP address; return 0. Hold onto this mbuf and
- * resend it once the address is finally resolved.
- *
- * We do some (conservative) locking here at splimp, since
- * arptab is also altered from input interrupt service (ecintr/ilintr
- * calls arpinput when ETHERPUP_ARPTYPE packets come in).
+ * desten is filled in. If there is no entry in arptab,
+ * set one up and broadcast a request for the IP address.
+ * Hold onto this mbuf and resend it once the address
+ * is finally resolved. A return value of 1 indicates
+ * that desten has been filled in and the packet should be sent
+ * normally; a 0 return indicates that the packet has been
+ * taken over here, either now or for later transmission.
*/
-arpresolve(ac, m, destip, desten)
+arpresolve(ac, rt, m, dst, desten, usetrailers)
register struct arpcom *ac;
+ register struct rtentry *rt;
struct mbuf *m;
- register struct in_addr *destip;
+ register struct sockaddr *dst;
register u_char *desten;
+ int *usetrailers;
{
- register struct arptab *at;
- struct sockaddr_in sin;
- int s, lna;
+ register struct llinfo_arp *la;
+ register struct in_ifaddr *ia;
+ struct sockaddr_dl *sdl;
- lna = in_lnaof(*destip);
- if (lna == INADDR_ANY) { /* broadcast address */
+ *usetrailers = 0;
+ if (m->m_flags & M_BCAST) { /* broadcast */
bcopy((caddr_t)etherbroadcastaddr, (caddr_t)desten,
- sizeof (etherbroadcastaddr));
+ sizeof(etherbroadcastaddr));
return (1);
}
- if (destip->s_addr == ((struct sockaddr_in *)&ac->ac_if.if_addr)->
- sin_addr.s_addr) { /* if for us, use lo driver */
- sin.sin_family = AF_INET;
- sin.sin_addr = *destip;
- return (looutput(&loif, m, (struct sockaddr *)&sin));
- }
-#ifdef OLDMAP
- if (lna >= 1024) {
- bcopy((caddr_t)ac->ac_enaddr, (caddr_t)desten, 3);
- desten[3] = (lna >> 16) & 0x7f;
- desten[4] = (lna >> 8) & 0xff;
- desten[5] = lna & 0xff;
- return (1);
+ if (rt)
+ la = (struct llinfo_arp *)rt->rt_llinfo;
+ else {
+ if (la = arplookup(SIN(dst)->sin_addr.s_addr, 1, 0))
+ rt = la->la_rt;
}
-#endif OLDMAP
- s = splimp();
- ARPTAB_LOOK(at, destip->s_addr);
- if (at == 0) { /* not found */
- at = arptnew(destip);
- at->at_hold = m;
- arpwhohas(ac, destip);
- splx(s);
+ if (la == 0 || rt == 0) {
+ log(LOG_DEBUG, "arpresolve: can't allocate llinfo");
+ m_freem(m);
return (0);
}
- at->at_timer = 0; /* restart the timer */
- if (at->at_flags & ATF_COM) { /* entry IS complete */
- bcopy((caddr_t)at->at_enaddr, (caddr_t)desten, 6);
- splx(s);
- return (1);
+ sdl = SDL(rt->rt_gateway);
+ /*
+ * Check the address family and length is valid, the address
+ * is resolved; otherwise, try to resolve.
+ */
+ if ((rt->rt_expire == 0 || rt->rt_expire > time.tv_sec) &&
+ sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0) {
+ bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
+ *usetrailers = rt->rt_flags & RTF_USETRAILERS;
+ return 1;
}
/*
* There is an arptab entry, but no ethernet address
* response yet. Replace the held mbuf with this
* latest one.
*/
- if (at->at_hold)
- m_freem(at->at_hold);
- at->at_hold = m;
- arpwhohas(ac, destip); /* ask again */
- splx(s);
+ 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.tv_sec) {
+ rt->rt_expire = time.tv_sec;
+ if (la->la_asked++ < arp_maxtries)
+ arpwhohas(ac, &(SIN(dst)->sin_addr));
+ else {
+ rt->rt_flags |= RTF_REJECT;
+ rt->rt_expire += arpt_down;
+ la->la_asked = 0;
+ }
+
+ }
+ }
return (0);
}
/*
- * Find my own IP address. It will either be waiting for us in
- * monitor RAM, or can be obtained via broadcast to the file/boot
- * server (not necessarily using the ARP packet format).
- *
- * Unimplemented at present, return 0 and assume that the host
- * will set his own IP address via the SIOCSIFADDR ioctl.
+ * Common length and type checks are done here,
+ * then the protocol-specific routine is called.
*/
-/*ARGSUSED*/
-struct in_addr
-arpmyaddr(ac)
- register struct arpcom *ac;
+arpintr()
{
- static struct in_addr addr;
+ register struct mbuf *m;
+ register struct arphdr *ar;
+ int s;
- addr.s_addr = 0;
- return (addr);
+ 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)) {
+
+ case ETHERTYPE_IP:
+ case ETHERTYPE_IPTRAILERS:
+ in_arpinput(m);
+ continue;
+ }
+ m_freem(m);
+ }
}
/*
- * Called from ecintr/ilintr when ether packet type ETHERPUP_ARP
- * is received. Algorithm is exactly that given in RFC 826.
+ * ARP for Internet protocols on 10 Mb/s Ethernet.
+ * Algorithm is that given in RFC 826.
* In addition, a sanity check is performed on the sender
* protocol address, to catch impersonators.
+ * We also handle negotiations for use of trailer protocol:
+ * ARP replies for protocol type ETHERTYPE_TRAIL are sent
+ * along with IP replies if we want trailers sent to us,
+ * and also send them in response to IP replies.
+ * This allows either end to announce the desire to receive
+ * trailer packets.
+ * We reply to requests for ETHERTYPE_TRAIL protocol as well,
+ * but don't normally send requests.
*/
-arpinput(ac, m)
- register struct arpcom *ac;
+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 arptab *at = 0; /* same as "merge" flag */
- struct sockaddr_in sin;
+ register struct llinfo_arp *la = 0;
+ register struct rtentry *rt;
+ struct in_ifaddr *ia, *maybe_ia = 0;
+ struct mbuf *mcopy = 0;
+ struct sockaddr_dl *sdl;
struct sockaddr sa;
- struct mbuf *mhold;
- struct in_addr isaddr,itaddr,myaddr;
+ struct in_addr isaddr, itaddr, myaddr;
+ int proto, op, completed = 0, sendtrailers;
- if (m->m_len < sizeof *ea)
+ if (ac->ac_if.if_flags & IFF_NOARP)
goto out;
- myaddr = ((struct sockaddr_in *)&ac->ac_if.if_addr)->sin_addr;
ea = mtod(m, struct ether_arp *);
- if (ntohs(ea->arp_pro) != ETHERPUP_IPTYPE)
+ proto = ntohs(ea->arp_pro);
+ op = ntohs(ea->arp_op);
+ bcopy((caddr_t)ea->arp_spa, (caddr_t)&isaddr, sizeof (isaddr));
+ bcopy((caddr_t)ea->arp_tpa, (caddr_t)&itaddr, sizeof (itaddr));
+ for (ia = in_ifaddr; ia; ia = ia->ia_next)
+ if (ia->ia_ifp == &ac->ac_if) {
+ 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)
goto out;
- isaddr.s_addr = ((struct in_addr *)ea->arp_spa)->s_addr;
- itaddr.s_addr = ((struct in_addr *)ea->arp_tpa)->s_addr;
+ myaddr = ia ? ia->ia_addr.sin_addr : maybe_ia->ia_addr.sin_addr;
if (!bcmp((caddr_t)ea->arp_sha, (caddr_t)ac->ac_enaddr,
- sizeof (ac->ac_enaddr)))
+ sizeof (ea->arp_sha)))
goto out; /* it's from me, ignore it. */
+ 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 %x!\n",
+ ntohl(isaddr.s_addr));
+ goto out;
+ }
if (isaddr.s_addr == myaddr.s_addr) {
- printf("duplicate IP address!! sent from ethernet address: ");
- printf("%x %x %x %x %x %x\n", ea->arp_sha[0], ea->arp_sha[1],
- ea->arp_sha[2], ea->arp_sha[3],
- ea->arp_sha[4], ea->arp_sha[5]);
- if (ntohs(ea->arp_op) == ARPOP_REQUEST)
+ log(LOG_ERR,
+ "duplicate IP address %x!! sent from ethernet address: %s\n",
+ ntohl(isaddr.s_addr), ether_sprintf(ea->arp_sha));
+ itaddr = myaddr;
+ if (op == ARPOP_REQUEST)
goto reply;
goto out;
}
- ARPTAB_LOOK(at, isaddr.s_addr);
- if (at) {
- bcopy((caddr_t)ea->arp_sha, (caddr_t)at->at_enaddr,
- sizeof (ea->arp_sha));
- at->at_flags |= ATF_COM;
- if (at->at_hold) {
- mhold = at->at_hold;
- at->at_hold = 0;
- sin.sin_family = AF_INET;
- sin.sin_addr = isaddr;
- (*ac->ac_if.if_output)(&ac->ac_if,
- mhold, (struct sockaddr *)&sin);
+ s = splimp();
+ la = arplookup(isaddr.s_addr, itaddr.s_addr == myaddr.s_addr, 0);
+ if (la && (rt = la->la_rt) && (sdl = SDL(rt->rt_gateway))) {
+ if (sdl->sdl_alen &&
+ bcmp((caddr_t)ea->arp_sha, LLADDR(sdl), sdl->sdl_alen))
+ log(LOG_INFO, "arp info overwritten for %x by %s\n",
+ isaddr.s_addr, ether_sprintf(ea->arp_sha));
+ completed = 1;
+ bcopy((caddr_t)ea->arp_sha, LLADDR(sdl),
+ sdl->sdl_alen = sizeof(ea->arp_sha));
+ if (rt->rt_expire)
+ rt->rt_expire = time.tv_sec + arpt_keep;
+ rt->rt_flags &= ~RTF_REJECT;
+ la->la_asked = 0;
+ if (la->la_hold) {
+ (*ac->ac_if.if_output)(&ac->ac_if, la->la_hold,
+ rt_key(rt), rt);
+ la->la_hold = 0;
}
}
- if (itaddr.s_addr != myaddr.s_addr)
- goto out; /* if I am not the target */
- if (at == 0) { /* ensure we have a table entry */
- at = arptnew(&isaddr);
- bcopy((caddr_t)ea->arp_sha, (caddr_t)at->at_enaddr,
- sizeof (ea->arp_sha));
- at->at_flags |= ATF_COM;
- }
- if (ntohs(ea->arp_op) != ARPOP_REQUEST)
- goto out;
reply:
- bcopy((caddr_t)ea->arp_sha, (caddr_t)ea->arp_tha,
- sizeof (ea->arp_sha));
+ switch (proto) {
+
+ case ETHERTYPE_IPTRAILERS:
+ /* partner says trailers are OK */
+ if (la)
+ la->la_rt->rt_flags |= RTF_USETRAILERS;
+ /*
+ * Reply to request iff we want trailers.
+ */
+ if (op != ARPOP_REQUEST || ac->ac_if.if_flags & IFF_NOTRAILERS)
+ goto out;
+ break;
+
+ case ETHERTYPE_IP:
+ /*
+ * Reply if this is an IP request,
+ * or if we want to send a trailer response.
+ * Send the latter only to the IP response
+ * that completes the current ARP entry.
+ */
+ if (op != ARPOP_REQUEST &&
+ (completed == 0 || ac->ac_if.if_flags & IFF_NOTRAILERS))
+ goto out;
+ }
+ if (itaddr.s_addr == myaddr.s_addr) {
+ /* I am the target */
+ bcopy((caddr_t)ea->arp_sha, (caddr_t)ea->arp_tha,
+ sizeof(ea->arp_sha));
+ bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->arp_sha,
+ sizeof(ea->arp_sha));
+ sendtrailers = !(ac->ac_if.if_flags & IFF_NOTRAILERS);
+ } else {
+ la = arplookup(itaddr.s_addr, 0, SIN_PROXY);
+ if (la == NULL)
+ goto out;
+ bcopy((caddr_t)ea->arp_sha, (caddr_t)ea->arp_tha,
+ sizeof(ea->arp_sha));
+ sdl = SDL(la->la_rt->rt_gateway);
+ bcopy(LLADDR(sdl), (caddr_t)ea->arp_sha, sizeof(ea->arp_sha));
+ sendtrailers = rt->rt_flags & RTF_USETRAILERS;
+ }
+
bcopy((caddr_t)ea->arp_spa, (caddr_t)ea->arp_tpa,
- sizeof (ea->arp_spa));
- bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->arp_sha,
- sizeof (ea->arp_sha));
- bcopy((caddr_t)&myaddr, (caddr_t)ea->arp_spa,
- sizeof (ea->arp_spa));
- ea->arp_op = htons(ARPOP_REPLY);
+ sizeof(ea->arp_spa));
+ bcopy((caddr_t)&itaddr, (caddr_t)ea->arp_spa,
+ sizeof(ea->arp_spa));
+ ea->arp_op = htons(ARPOP_REPLY);
+ /*
+ * If incoming packet was an IP reply,
+ * we are sending a reply for type IPTRAILERS.
+ * If we are sending a reply for type IP
+ * and we want to receive trailers,
+ * send a trailer reply as well.
+ */
+ if (op == ARPOP_REPLY)
+ ea->arp_pro = htons(ETHERTYPE_IPTRAILERS);
+ else if (proto == ETHERTYPE_IP && sendtrailers)
+ mcopy = m_copy(m, 0, (int)M_COPYALL);
eh = (struct ether_header *)sa.sa_data;
bcopy((caddr_t)ea->arp_tha, (caddr_t)eh->ether_dhost,
- sizeof (eh->ether_dhost));
- eh->ether_type = ETHERPUP_ARPTYPE;
+ sizeof(eh->ether_dhost));
+ eh->ether_type = ETHERTYPE_ARP;
sa.sa_family = AF_UNSPEC;
- (*ac->ac_if.if_output)(&ac->ac_if, m, &sa);
+ sa.sa_len = sizeof(sa);
+ (*ac->ac_if.if_output)(&ac->ac_if, m, &sa, (struct rtentry *)0);
+ if (mcopy) {
+ ea = mtod(mcopy, struct ether_arp *);
+ ea->arp_pro = htons(ETHERTYPE_IPTRAILERS);
+ (*ac->ac_if.if_output)(&ac->ac_if,
+ mcopy, &sa, (struct rtentry *)0);
+ }
return;
out:
m_freem(m);
}
/*
- * Free an arptab entry.
+ * Free an arp entry.
*/
-arptfree(at)
- register struct arptab *at;
+arptfree(la)
+ register struct llinfo_arp *la;
{
- int s = splimp();
-
- if (at->at_hold)
- m_freem(at->at_hold);
- at->at_hold = 0;
- at->at_timer = at->at_flags = 0;
- at->at_iaddr.s_addr = 0;
- splx(s);
+ 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);
}
-
+int arpdebug = 0;
/*
- * Enter a new address in arptab, pushing out the oldest entry
- * from the bucket if there is no room.
+ * Lookup or enter a new address in arptab.
*/
-struct arptab *
-arptnew(addr)
- struct in_addr *addr;
+struct llinfo_arp *
+arplookup(addr, create, proxy)
+ u_long addr;
{
- register n;
- int oldest = 0;
- register struct arptab *at, *ato;
-
- ato = at = &arptab[ARPTAB_HASH(addr->s_addr) * ARPTAB_BSIZ];
- for (n = 0 ; n < ARPTAB_BSIZ ; n++,at++) {
- if (at->at_flags == 0)
- goto out; /* found an empty entry */
- if (at->at_timer > oldest) {
- oldest = at->at_timer;
- ato = at;
- }
+ register struct rtentry *rt;
+ static struct sockaddr_inarp sin = {sizeof(sin), AF_INET };
+
+ sin.sin_addr.s_addr = addr;
+ sin.sin_other = proxy ? SIN_PROXY : 0;
+ rt = rtalloc1((struct sockaddr *)&sin, create);
+ if (rt == 0)
+ return (0);
+ rt->rt_refcnt--;
+ if ((rt->rt_flags & RTF_GATEWAY) || !(rt->rt_flags & RTF_LLINFO) ||
+ rt->rt_gateway->sa_family != AF_LINK) {
+ arpcatchme();
+ if (arpdebug)
+ log(LOG_DEBUG, "arptnew failed on %x\n", ntohl(addr));
+ return (0);
}
- at = ato;
- arptfree(at);
-out:
- at->at_iaddr = *addr;
- at->at_flags = ATF_INUSE;
- return (at);
+ return ((struct llinfo_arp *)rt->rt_llinfo);
+}
+
+arpcatchme(){}
+
+arpioctl(cmd, data)
+ int cmd;
+ caddr_t data;
+{
+ return (EOPNOTSUPP);
}