* 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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
+ * 3. 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.
*
/*
* Changes and additions relating to SLiRP are
* Copyright (c) 1995 Danny Gasparovski.
- *
+ *
* Please read the file COPYRIGHT for the
* terms and conditions of the copyright.
*/
#include <slirp.h>
+#include <osdep.h>
#include "ip_icmp.h"
-int ip_defttl;
+#ifdef LOG_ENABLED
struct ipstat ipstat;
+#endif
+
struct ipq ipq;
+static struct ip *ip_reass(register struct ip *ip,
+ register struct ipq *fp);
+static void ip_freef(struct ipq *fp);
+static void ip_enq(register struct ipasfrag *p,
+ register struct ipasfrag *prev);
+static void ip_deq(register struct ipasfrag *p);
+
/*
* IP initialization: fill in IP protocol switch table.
* All protocols not implemented in kernel go to raw IP protocol handler.
*/
void
-ip_init()
+ip_init(void)
{
- ipq.next = ipq.prev = (ipqp_32)&ipq;
+ ipq.ip_link.next = ipq.ip_link.prev = &ipq.ip_link;
ip_id = tt.tv_sec & 0xffff;
udp_init();
tcp_init();
- ip_defttl = IPDEFTTL;
}
/*
* try to reassemble. Process options. Pass to next level.
*/
void
-ip_input(m)
- struct mbuf *m;
+ip_input(struct mbuf *m)
{
register struct ip *ip;
int hlen;
-
+
DEBUG_CALL("ip_input");
DEBUG_ARG("m = %lx", (long)m);
DEBUG_ARG("m_len = %d", m->m_len);
- ipstat.ips_total++;
-
+ STAT(ipstat.ips_total++);
+
if (m->m_len < sizeof (struct ip)) {
- ipstat.ips_toosmall++;
+ STAT(ipstat.ips_toosmall++);
return;
}
-
+
ip = mtod(m, struct ip *);
-
+
if (ip->ip_v != IPVERSION) {
- ipstat.ips_badvers++;
+ STAT(ipstat.ips_badvers++);
goto bad;
}
hlen = ip->ip_hl << 2;
if (hlen<sizeof(struct ip ) || hlen>m->m_len) {/* min header length */
- ipstat.ips_badhlen++; /* or packet too short */
+ STAT(ipstat.ips_badhlen++); /* or packet too short */
goto bad;
}
/* keep ip header intact for ICMP reply
- * ip->ip_sum = cksum(m, hlen);
- * if (ip->ip_sum) {
+ * ip->ip_sum = cksum(m, hlen);
+ * if (ip->ip_sum) {
*/
if(cksum(m,hlen)) {
- ipstat.ips_badsum++;
+ STAT(ipstat.ips_badsum++);
goto bad;
}
*/
NTOHS(ip->ip_len);
if (ip->ip_len < hlen) {
- ipstat.ips_badlen++;
+ STAT(ipstat.ips_badlen++);
goto bad;
}
NTOHS(ip->ip_id);
* Drop packet if shorter than we expect.
*/
if (m->m_len < ip->ip_len) {
- ipstat.ips_tooshort++;
+ STAT(ipstat.ips_tooshort++);
goto bad;
}
+
+ if (slirp_restrict) {
+ if (memcmp(&ip->ip_dst.s_addr, &special_addr, 3)) {
+ if (ip->ip_dst.s_addr == 0xffffffff && ip->ip_p != IPPROTO_UDP)
+ goto bad;
+ } else {
+ int host = ntohl(ip->ip_dst.s_addr) & 0xff;
+ struct ex_list *ex_ptr;
+
+ if (host == 0xff)
+ goto bad;
+
+ for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
+ if (ex_ptr->ex_addr == host)
+ break;
+
+ if (!ex_ptr)
+ goto bad;
+ }
+ }
+
/* Should drop packet if mbuf too long? hmmm... */
if (m->m_len > ip->ip_len)
m_adj(m, ip->ip_len - m->m_len);
* (We could look in the reassembly queue to see
* if the packet was previously fragmented,
* but it's not worth the time; just let them time out.)
- *
+ *
* XXX This should fail, don't fragment yet
*/
if (ip->ip_off &~ IP_DF) {
register struct ipq *fp;
+ struct qlink *l;
/*
* Look for queue of fragments
* of this datagram.
*/
- for (fp = (struct ipq *) ipq.next; fp != &ipq;
- fp = (struct ipq *) fp->next)
- if (ip->ip_id == fp->ipq_id &&
- ip->ip_src.s_addr == fp->ipq_src.s_addr &&
- ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
- ip->ip_p == fp->ipq_p)
+ for (l = ipq.ip_link.next; l != &ipq.ip_link; l = l->next) {
+ fp = container_of(l, struct ipq, ip_link);
+ if (ip->ip_id == fp->ipq_id &&
+ ip->ip_src.s_addr == fp->ipq_src.s_addr &&
+ ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
+ ip->ip_p == fp->ipq_p)
goto found;
- fp = 0;
+ }
+ fp = NULL;
found:
/*
*/
ip->ip_len -= hlen;
if (ip->ip_off & IP_MF)
- ((struct ipasfrag *)ip)->ipf_mff |= 1;
- else
- ((struct ipasfrag *)ip)->ipf_mff &= ~1;
+ ip->ip_tos |= 1;
+ else
+ ip->ip_tos &= ~1;
ip->ip_off <<= 3;
* or if this is not the first fragment,
* attempt reassembly; if it succeeds, proceed.
*/
- if (((struct ipasfrag *)ip)->ipf_mff & 1 || ip->ip_off) {
- ipstat.ips_fragments++;
- ip = ip_reass((struct ipasfrag *)ip, fp);
- if (ip == 0)
+ if (ip->ip_tos & 1 || ip->ip_off) {
+ STAT(ipstat.ips_fragments++);
+ ip = ip_reass(ip, fp);
+ if (ip == NULL)
return;
- ipstat.ips_reassembled++;
+ STAT(ipstat.ips_reassembled++);
m = dtom(ip);
} else
if (fp)
/*
* Switch out to protocol's input routine.
*/
- ipstat.ips_delivered++;
+ STAT(ipstat.ips_delivered++);
switch (ip->ip_p) {
case IPPROTO_TCP:
tcp_input(m, hlen, (struct socket *)NULL);
icmp_input(m, hlen);
break;
default:
- ipstat.ips_noproto++;
+ STAT(ipstat.ips_noproto++);
m_free(m);
}
return;
return;
}
+#define iptofrag(P) ((struct ipasfrag *)(((char*)(P)) - sizeof(struct qlink)))
+#define fragtoip(P) ((struct ip*)(((char*)(P)) + sizeof(struct qlink)))
/*
* Take incoming datagram fragment and try to
* reassemble it into whole datagram. If a chain for
* reassembly of this datagram already exists, then it
* is given as fp; otherwise have to make a chain.
*/
-struct ip *
-ip_reass(ip, fp)
- register struct ipasfrag *ip;
- register struct ipq *fp;
+static struct ip *
+ip_reass(register struct ip *ip, register struct ipq *fp)
{
register struct mbuf *m = dtom(ip);
register struct ipasfrag *q;
int hlen = ip->ip_hl << 2;
int i, next;
-
+
DEBUG_CALL("ip_reass");
DEBUG_ARG("ip = %lx", (long)ip);
DEBUG_ARG("fp = %lx", (long)fp);
/*
* If first fragment to arrive, create a reassembly queue.
*/
- if (fp == 0) {
+ if (fp == NULL) {
struct mbuf *t;
if ((t = m_get()) == NULL) goto dropfrag;
fp = mtod(t, struct ipq *);
- insque_32(fp, &ipq);
+ insque(&fp->ip_link, &ipq.ip_link);
fp->ipq_ttl = IPFRAGTTL;
fp->ipq_p = ip->ip_p;
fp->ipq_id = ip->ip_id;
- fp->ipq_next = fp->ipq_prev = (ipasfragp_32)fp;
- fp->ipq_src = ((struct ip *)ip)->ip_src;
- fp->ipq_dst = ((struct ip *)ip)->ip_dst;
+ fp->frag_link.next = fp->frag_link.prev = &fp->frag_link;
+ fp->ipq_src = ip->ip_src;
+ fp->ipq_dst = ip->ip_dst;
q = (struct ipasfrag *)fp;
goto insert;
}
-
+
/*
* Find a segment which begins after this one does.
*/
- for (q = (struct ipasfrag *)fp->ipq_next; q != (struct ipasfrag *)fp;
- q = (struct ipasfrag *)q->ipf_next)
- if (q->ip_off > ip->ip_off)
+ for (q = fp->frag_link.next; q != (struct ipasfrag *)&fp->frag_link;
+ q = q->ipf_next)
+ if (q->ipf_off > ip->ip_off)
break;
/*
* our data already. If so, drop the data from the incoming
* segment. If it provides all of our data, drop us.
*/
- if (q->ipf_prev != (ipasfragp_32)fp) {
- i = ((struct ipasfrag *)(q->ipf_prev))->ip_off +
- ((struct ipasfrag *)(q->ipf_prev))->ip_len - ip->ip_off;
+ if (q->ipf_prev != &fp->frag_link) {
+ struct ipasfrag *pq = q->ipf_prev;
+ i = pq->ipf_off + pq->ipf_len - ip->ip_off;
if (i > 0) {
if (i >= ip->ip_len)
goto dropfrag;
* While we overlap succeeding segments trim them or,
* if they are completely covered, dequeue them.
*/
- while (q != (struct ipasfrag *)fp && ip->ip_off + ip->ip_len > q->ip_off) {
- i = (ip->ip_off + ip->ip_len) - q->ip_off;
- if (i < q->ip_len) {
- q->ip_len -= i;
- q->ip_off += i;
+ while (q != (struct ipasfrag*)&fp->frag_link &&
+ ip->ip_off + ip->ip_len > q->ipf_off) {
+ i = (ip->ip_off + ip->ip_len) - q->ipf_off;
+ if (i < q->ipf_len) {
+ q->ipf_len -= i;
+ q->ipf_off += i;
m_adj(dtom(q), i);
break;
}
- q = (struct ipasfrag *) q->ipf_next;
- m_freem(dtom((struct ipasfrag *) q->ipf_prev));
- ip_deq((struct ipasfrag *) q->ipf_prev);
+ q = q->ipf_next;
+ m_freem(dtom(q->ipf_prev));
+ ip_deq(q->ipf_prev);
}
insert:
* Stick new segment in its place;
* check for complete reassembly.
*/
- ip_enq(ip, (struct ipasfrag *) q->ipf_prev);
+ ip_enq(iptofrag(ip), q->ipf_prev);
next = 0;
- for (q = (struct ipasfrag *) fp->ipq_next; q != (struct ipasfrag *)fp;
- q = (struct ipasfrag *) q->ipf_next) {
- if (q->ip_off != next)
- return (0);
- next += q->ip_len;
+ for (q = fp->frag_link.next; q != (struct ipasfrag*)&fp->frag_link;
+ q = q->ipf_next) {
+ if (q->ipf_off != next)
+ return NULL;
+ next += q->ipf_len;
}
- if (((struct ipasfrag *)(q->ipf_prev))->ipf_mff & 1)
- return (0);
+ if (((struct ipasfrag *)(q->ipf_prev))->ipf_tos & 1)
+ return NULL;
/*
* Reassembly is complete; concatenate fragments.
*/
- q = (struct ipasfrag *) fp->ipq_next;
+ q = fp->frag_link.next;
m = dtom(q);
q = (struct ipasfrag *) q->ipf_next;
- while (q != (struct ipasfrag *)fp) {
- struct mbuf *t;
- t = dtom(q);
- m_cat(m, t);
+ while (q != (struct ipasfrag*)&fp->frag_link) {
+ struct mbuf *t = dtom(q);
q = (struct ipasfrag *) q->ipf_next;
+ m_cat(m, t);
}
/*
* dequeue and discard fragment reassembly header.
* Make header visible.
*/
- ip = (struct ipasfrag *) fp->ipq_next;
+ q = fp->frag_link.next;
/*
* If the fragments concatenated to an mbuf that's
* into the new buffer.
*/
if (m->m_flags & M_EXT) {
- int delta;
- delta = (char *)ip - m->m_dat;
- ip = (struct ipasfrag *)(m->m_ext + delta);
+ int delta = (char *)q - m->m_dat;
+ q = (struct ipasfrag *)(m->m_ext + delta);
}
- /* DEBUG_ARG("ip = %lx", (long)ip);
+ /* DEBUG_ARG("ip = %lx", (long)ip);
* ip=(struct ipasfrag *)m->m_data; */
+ ip = fragtoip(q);
ip->ip_len = next;
- ip->ipf_mff &= ~1;
- ((struct ip *)ip)->ip_src = fp->ipq_src;
- ((struct ip *)ip)->ip_dst = fp->ipq_dst;
- remque_32(fp);
+ ip->ip_tos &= ~1;
+ ip->ip_src = fp->ipq_src;
+ ip->ip_dst = fp->ipq_dst;
+ remque(&fp->ip_link);
(void) m_free(dtom(fp));
- m = dtom(ip);
m->m_len += (ip->ip_hl << 2);
m->m_data -= (ip->ip_hl << 2);
- return ((struct ip *)ip);
+ return ip;
dropfrag:
- ipstat.ips_fragdropped++;
+ STAT(ipstat.ips_fragdropped++);
m_freem(m);
- return (0);
+ return NULL;
}
/*
* Free a fragment reassembly header and all
* associated datagrams.
*/
-void
-ip_freef(fp)
- struct ipq *fp;
+static void
+ip_freef(struct ipq *fp)
{
register struct ipasfrag *q, *p;
- for (q = (struct ipasfrag *) fp->ipq_next; q != (struct ipasfrag *)fp;
- q = p) {
- p = (struct ipasfrag *) q->ipf_next;
+ for (q = fp->frag_link.next; q != (struct ipasfrag*)&fp->frag_link; q = p) {
+ p = q->ipf_next;
ip_deq(q);
m_freem(dtom(q));
}
- remque_32(fp);
+ remque(&fp->ip_link);
(void) m_free(dtom(fp));
}
* Put an ip fragment on a reassembly chain.
* Like insque, but pointers in middle of structure.
*/
-void
-ip_enq(p, prev)
- register struct ipasfrag *p, *prev;
+static void
+ip_enq(register struct ipasfrag *p, register struct ipasfrag *prev)
{
DEBUG_CALL("ip_enq");
DEBUG_ARG("prev = %lx", (long)prev);
- p->ipf_prev = (ipasfragp_32) prev;
+ p->ipf_prev = prev;
p->ipf_next = prev->ipf_next;
- ((struct ipasfrag *)(prev->ipf_next))->ipf_prev = (ipasfragp_32) p;
- prev->ipf_next = (ipasfragp_32) p;
+ ((struct ipasfrag *)(prev->ipf_next))->ipf_prev = p;
+ prev->ipf_next = p;
}
/*
* To ip_enq as remque is to insque.
*/
-void
-ip_deq(p)
- register struct ipasfrag *p;
+static void
+ip_deq(register struct ipasfrag *p)
{
((struct ipasfrag *)(p->ipf_prev))->ipf_next = p->ipf_next;
((struct ipasfrag *)(p->ipf_next))->ipf_prev = p->ipf_prev;
* queue, discard it.
*/
void
-ip_slowtimo()
+ip_slowtimo(void)
{
- register struct ipq *fp;
-
+ struct qlink *l;
+
DEBUG_CALL("ip_slowtimo");
-
- fp = (struct ipq *) ipq.next;
- if (fp == 0)
+
+ l = ipq.ip_link.next;
+
+ if (l == NULL)
return;
- while (fp != &ipq) {
- --fp->ipq_ttl;
- fp = (struct ipq *) fp->next;
- if (((struct ipq *)(fp->prev))->ipq_ttl == 0) {
- ipstat.ips_fragtimeout++;
- ip_freef((struct ipq *) fp->prev);
+ while (l != &ipq.ip_link) {
+ struct ipq *fp = container_of(l, struct ipq, ip_link);
+ l = l->next;
+ if (--fp->ipq_ttl == 0) {
+ STAT(ipstat.ips_fragtimeout++);
+ ip_freef(fp);
}
}
}
/* Not yet */
icmp_error(m, type, code, 0, 0);
- ipstat.ips_badoptions++;
+ STAT(ipstat.ips_badoptions++);
return (1);
}
* (XXX) should be deleted; last arg currently ignored.
*/
void
-ip_stripoptions(m, mopt)
- register struct mbuf *m;
- struct mbuf *mopt;
+ip_stripoptions(register struct mbuf *m, struct mbuf *mopt)
{
register int i;
struct ip *ip = mtod(m, struct ip *);
i = m->m_len - (sizeof (struct ip) + olen);
memcpy(opts, opts + olen, (unsigned)i);
m->m_len -= olen;
-
+
ip->ip_hl = sizeof(struct ip) >> 2;
}
projects / qemu / blobdiff