-/* ip_output.c 1.23 82/01/19 */
+/* ip_output.c 1.46 83/02/10 */
#include "../h/param.h"
#include "../h/mbuf.h"
-#include "../h/mtpr.h"
+#include "../h/errno.h"
#include "../h/socket.h"
#include "../h/socketvar.h"
-#include "../net/in.h"
-#include "../net/in_systm.h"
+
#include "../net/if.h"
-#include "../net/ip.h"
-#include "../net/ip_var.h"
+#include "../net/route.h"
+
+#include "../netinet/in.h"
+#include "../netinet/in_systm.h"
+#include "../netinet/ip.h"
+#include "../netinet/ip_var.h"
+
+#include "../machine/mtpr.h"
+
+int ipnorouteprint = 0;
-ip_output(m, opt)
+ip_output(m, opt, ro, allowbroadcast)
struct mbuf *m;
struct mbuf *opt;
+ struct route *ro;
+ int allowbroadcast;
{
register struct ip *ip = mtod(m, struct ip *);
register struct ifnet *ifp;
- int len, hlen = sizeof (struct ip), off;
+ int len, hlen = sizeof (struct ip), off, error = 0;
+ struct route iproute;
+ struct sockaddr *dst;
-COUNT(IP_OUTPUT);
if (opt) /* XXX */
(void) m_free(opt); /* XXX */
/*
ip->ip_id = htons(ip_id++);
/*
- * Find interface for this packet.
+ * Route packet.
+ */
+ if (ro == 0) {
+ ro = &iproute;
+ bzero((caddr_t)ro, sizeof (*ro));
+ }
+ dst = &ro->ro_dst;
+ if (ro->ro_rt == 0) {
+ ro->ro_dst.sa_family = AF_INET;
+ ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = ip->ip_dst;
+ /*
+ * If routing to interface only, short circuit routing lookup.
+ */
+ if (ro == &routetoif) {
+ /* check ifp is AF_INET??? */
+ ifp = if_ifonnetof(in_netof(ip->ip_dst));
+ if (ifp == 0)
+ goto unreachable;
+ goto gotif;
+ }
+ rtalloc(ro);
+ }
+ if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0)
+ goto unreachable;
+ ro->ro_rt->rt_use++;
+ if (ro->ro_rt->rt_flags & RTF_GATEWAY)
+ dst = &ro->ro_rt->rt_gateway;
+gotif:
+#ifndef notdef
+ /*
+ * If source address not specified yet, use address
+ * of outgoing interface.
+ */
+ if (in_lnaof(ip->ip_src) == INADDR_ANY)
+ ip->ip_src.s_addr =
+ ((struct sockaddr_in *)&ifp->if_addr)->sin_addr.s_addr;
+#endif
+
+ /*
+ * Look for broadcast address and
+ * and verify user is allowed to send
+ * such a packet.
*/
- ifp = if_ifonnetof(ip->ip_dst);
- if (ifp == 0) {
- ifp = if_gatewayfor(ip->ip_dst);
- if (ifp == 0)
+ if (in_lnaof(dst) == INADDR_ANY) {
+ if ((ifp->if_flags & IFF_BROADCAST) == 0) {
+ error = EADDRNOTAVAIL;
+ goto bad;
+ }
+ if (!allowbroadcast) {
+ error = EACCES;
+ goto bad;
+ }
+ /* don't allow broadcast messages to be fragmented */
+ if (ip->ip_len > ifp->if_mtu) {
+ error = EMSGSIZE;
goto bad;
+ }
}
/*
* If small enough for interface, can just send directly.
*/
if (ip->ip_len <= ifp->if_mtu) {
-#if vax
ip->ip_len = htons((u_short)ip->ip_len);
ip->ip_off = htons((u_short)ip->ip_off);
-#endif
ip->ip_sum = 0;
ip->ip_sum = in_cksum(m, hlen);
- return ((*ifp->if_output)(ifp, m, PF_INET));
+ error = (*ifp->if_output)(ifp, m, dst);
+ goto done;
}
/*
* Too large for interface; fragment if possible.
* Must be able to put at least 8 bytes per fragment.
*/
- if (ip->ip_off & IP_DF)
+ if (ip->ip_off & IP_DF) {
+ error = EMSGSIZE;
goto bad;
+ }
len = (ifp->if_mtu - hlen) &~ 7;
- if (len < 8)
+ if (len < 8) {
+ error = EMSGSIZE;
goto bad;
+ }
/*
* Discard IP header from logical mbuf for m_copy's sake.
*/
m->m_len -= sizeof (struct ip);
m->m_off += sizeof (struct ip);
- for (off = 0; off < ip->ip_len; off += len) {
- struct mbuf *mh = m_get(M_DONTWAIT);
+ for (off = 0; off < ip->ip_len-hlen; off += len) {
+ struct mbuf *mh = m_get(M_DONTWAIT, MT_HEADER);
struct ip *mhip;
- if (mh == 0)
+ if (mh == 0) {
+ error = ENOBUFS;
goto bad;
+ }
mh->m_off = MMAXOFF - hlen;
mhip = mtod(mh, struct ip *);
*mhip = *ip;
mh->m_len = sizeof (struct ip) + olen;
} else
mh->m_len = sizeof (struct ip);
- mhip->ip_off = off;
- if (off + len >= ip->ip_len)
- mhip->ip_len = ip->ip_len - off;
+ mhip->ip_off = off >> 3;
+ if (off + len >= ip->ip_len-hlen)
+ len = mhip->ip_len = ip->ip_len - hlen - off;
else {
mhip->ip_len = len;
mhip->ip_off |= IP_MF;
}
- mhip->ip_len = htons((u_short)(mhip->ip_len + sizeof (struct ip)));
+ mhip->ip_len += sizeof (struct ip);
+ mhip->ip_len = htons((u_short)mhip->ip_len);
mh->m_next = m_copy(m, off, len);
if (mh->m_next == 0) {
(void) m_free(mh);
+ error = ENOBUFS; /* ??? */
goto bad;
}
- ip->ip_off = htons((u_short)ip->ip_off);
- ip->ip_sum = 0;
- ip->ip_sum = in_cksum(m, hlen);
- if ((*ifp->if_output)(ifp, mh, PF_INET) == 0)
- goto bad;
+ mhip->ip_off = htons((u_short)mhip->ip_off);
+ mhip->ip_sum = 0;
+ mhip->ip_sum = in_cksum(mh, hlen);
+ if (error = (*ifp->if_output)(ifp, mh, dst))
+ break;
}
m_freem(m);
- return (1);
+ goto done;
+
+unreachable:
+ if (ipnorouteprint)
+ printf("no route to %x (from %x, len %d)\n",
+ ip->ip_dst.s_addr, ip->ip_src.s_addr, ip->ip_len);
+ error = ENETUNREACH;
bad:
m_freem(m);
- return (0);
+done:
+ if (ro == &iproute && ro->ro_rt)
+ RTFREE(ro->ro_rt);
+ return (error);
}
/*
register u_char *cp, *dp;
int opt, optlen, cnt;
-COUNT(IP_OPTCOPY);
cp = (u_char *)(ip + 1);
dp = (u_char *)(jp + 1);
cnt = (ip->ip_hl << 2) - sizeof (struct ip);