svn commit: r318320 - head/lib/libstand
Toomas Soome
tsoome at FreeBSD.org
Mon May 15 21:50:36 UTC 2017
Author: tsoome
Date: Mon May 15 21:50:34 2017
New Revision: 318320
URL: https://svnweb.freebsd.org/changeset/base/318320
Log:
loader: add ip layer code into libstand
Implement simple separate ip module and fragment re-assembly.
The work is based on send and receive previously implemented in udp.c,
moved to ip.c and added the ip fragment re-assembly.
This change allows to specify larger tftp or nfs payload, such as:
tftp.blksize=4096 or nfs.read_size=4096
Reviewed by: bapt
Differential Revision: https://reviews.freebsd.org/D10631
Added:
head/lib/libstand/ip.c (contents, props changed)
Modified:
head/lib/libstand/Makefile
head/lib/libstand/net.h
head/lib/libstand/udp.c
Modified: head/lib/libstand/Makefile
==============================================================================
--- head/lib/libstand/Makefile Mon May 15 21:44:40 2017 (r318319)
+++ head/lib/libstand/Makefile Mon May 15 21:50:34 2017 (r318320)
@@ -141,7 +141,7 @@ SRCS+= closeall.c dev.c ioctl.c nullfs.c
fstat.c close.c lseek.c open.c read.c write.c readdir.c
# network routines
-SRCS+= arp.c ether.c inet_ntoa.c in_cksum.c net.c udp.c netif.c rpc.c
+SRCS+= arp.c ether.c ip.c inet_ntoa.c in_cksum.c net.c udp.c netif.c rpc.c
# network info services:
SRCS+= bootp.c rarp.c bootparam.c
Added: head/lib/libstand/ip.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/lib/libstand/ip.c Mon May 15 21:50:34 2017 (r318320)
@@ -0,0 +1,422 @@
+/*
+ * Copyright (c) 1992 Regents of the University of California.
+ * All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * 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.
+ * 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.
+ *
+ * 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.
+ */
+
+/*
+ * The send and receive functions were originally implemented in udp.c and
+ * moved here. Also it is likely some more cleanup can be done, especially
+ * once we will implement the support for tcp.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/queue.h>
+
+#include <string.h>
+
+#include <net/if.h>
+#include <netinet/in.h>
+#include <netinet/if_ether.h>
+#include <netinet/in_systm.h>
+
+#include <netinet/in_pcb.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
+
+#include "stand.h"
+#include "net.h"
+
+typedef STAILQ_HEAD(ipqueue, ip_queue) ip_queue_t;
+struct ip_queue {
+ void *ipq_pkt;
+ struct ip *ipq_hdr;
+ STAILQ_ENTRY(ip_queue) ipq_next;
+};
+
+/*
+ * Fragment re-assembly queue.
+ */
+struct ip_reasm {
+ struct in_addr ip_src;
+ struct in_addr ip_dst;
+ uint16_t ip_id;
+ uint8_t ip_proto;
+ uint8_t ip_ttl;
+ size_t ip_total_size;
+ ip_queue_t ip_queue;
+ void *ip_pkt;
+ struct ip *ip_hdr;
+ STAILQ_ENTRY(ip_reasm) ip_next;
+};
+
+STAILQ_HEAD(ire_list, ip_reasm) ire_list = STAILQ_HEAD_INITIALIZER(ire_list);
+
+/* Caller must leave room for ethernet and ip headers in front!! */
+ssize_t
+sendip(struct iodesc *d, void *pkt, size_t len, uint8_t proto)
+{
+ ssize_t cc;
+ struct ip *ip;
+ u_char *ea;
+
+#ifdef NET_DEBUG
+ if (debug) {
+ printf("sendip: proto: %x d=%p called.\n", proto, (void *)d);
+ if (d) {
+ printf("saddr: %s:%d",
+ inet_ntoa(d->myip), ntohs(d->myport));
+ printf(" daddr: %s:%d\n",
+ inet_ntoa(d->destip), ntohs(d->destport));
+ }
+ }
+#endif
+
+ ip = (struct ip *)pkt - 1;
+ len += sizeof(*ip);
+
+ bzero(ip, sizeof(*ip));
+
+ ip->ip_v = IPVERSION; /* half-char */
+ ip->ip_hl = sizeof(*ip) >> 2; /* half-char */
+ ip->ip_len = htons(len);
+ ip->ip_p = proto; /* char */
+ ip->ip_ttl = IPDEFTTL; /* char */
+ ip->ip_src = d->myip;
+ ip->ip_dst = d->destip;
+ ip->ip_sum = in_cksum(ip, sizeof(*ip)); /* short, but special */
+
+ if (ip->ip_dst.s_addr == INADDR_BROADCAST || ip->ip_src.s_addr == 0 ||
+ netmask == 0 || SAMENET(ip->ip_src, ip->ip_dst, netmask))
+ ea = arpwhohas(d, ip->ip_dst);
+ else
+ ea = arpwhohas(d, gateip);
+
+ cc = sendether(d, ip, len, ea, ETHERTYPE_IP);
+ if (cc == -1)
+ return (-1);
+ if (cc != len)
+ panic("sendip: bad write (%zd != %zd)", cc, len);
+ return (cc - sizeof(*ip));
+}
+
+static void
+ip_reasm_free(struct ip_reasm *ipr)
+{
+ struct ip_queue *ipq;
+
+ while ((ipq = STAILQ_FIRST(&ipr->ip_queue)) != NULL) {
+ STAILQ_REMOVE_HEAD(&ipr->ip_queue, ipq_next);
+ free(ipq->ipq_pkt);
+ free(ipq);
+ }
+ free(ipr->ip_pkt);
+ free(ipr);
+}
+
+static int
+ip_reasm_add(struct ip_reasm *ipr, void *pkt, struct ip *ip)
+{
+ struct ip_queue *ipq, *prev, *p;
+
+ if ((ipq = calloc(1, sizeof (*ipq))) == NULL)
+ return (1);
+
+ ipq->ipq_pkt = pkt;
+ ipq->ipq_hdr = ip;
+
+ prev = NULL;
+ STAILQ_FOREACH(p, &ipr->ip_queue, ipq_next) {
+ if ((ntohs(p->ipq_hdr->ip_off) & IP_OFFMASK) <
+ (ntohs(ip->ip_off) & IP_OFFMASK)) {
+ prev = p;
+ continue;
+ }
+ if (prev == NULL)
+ break;
+
+ STAILQ_INSERT_AFTER(&ipr->ip_queue, prev, ipq, ipq_next);
+ return (0);
+ }
+ STAILQ_INSERT_HEAD(&ipr->ip_queue, ipq, ipq_next);
+ return (0);
+}
+
+/*
+ * Receive a IP packet and validate it is for us.
+ */
+static ssize_t
+readipv4(struct iodesc *d, void **pkt, void **payload, time_t tleft,
+ uint8_t proto)
+{
+ ssize_t n;
+ size_t hlen;
+ struct ether_header *eh;
+ struct ip *ip;
+ struct udphdr *uh;
+ uint16_t etype; /* host order */
+ char *ptr;
+ struct ip_reasm *ipr;
+ struct ip_queue *ipq, *last;
+
+#ifdef NET_DEBUG
+ if (debug)
+ printf("readip: called\n");
+#endif
+
+ ip = NULL;
+ ptr = NULL;
+ n = readether(d, (void **)&ptr, (void **)&ip, tleft, &etype);
+ if (n == -1 || n < sizeof(*ip) + sizeof(*uh)) {
+ free(ptr);
+ return (-1);
+ }
+
+ /* Ethernet address checks now in readether() */
+
+ /* Need to respond to ARP requests. */
+ if (etype == ETHERTYPE_ARP) {
+ struct arphdr *ah = (void *)ip;
+ if (ah->ar_op == htons(ARPOP_REQUEST)) {
+ /* Send ARP reply */
+ arp_reply(d, ah);
+ }
+ free(ptr);
+ errno = EAGAIN; /* Call me again. */
+ return (-1);
+ }
+
+ if (etype != ETHERTYPE_IP) {
+#ifdef NET_DEBUG
+ if (debug)
+ printf("readip: not IP. ether_type=%x\n", etype);
+#endif
+ free(ptr);
+ return (-1);
+ }
+
+ /* Check ip header */
+ if (ip->ip_v != IPVERSION ||
+ ip->ip_p != proto) { /* half char */
+#ifdef NET_DEBUG
+ if (debug) {
+ printf("readip: IP version or proto. ip_v=%d ip_p=%d\n",
+ ip->ip_v, ip->ip_p);
+ }
+#endif
+ free(ptr);
+ return (-1);
+ }
+
+ hlen = ip->ip_hl << 2;
+ if (hlen < sizeof(*ip) ||
+ in_cksum(ip, hlen) != 0) {
+#ifdef NET_DEBUG
+ if (debug)
+ printf("readip: short hdr or bad cksum.\n");
+#endif
+ free(ptr);
+ return (-1);
+ }
+ if (n < ntohs(ip->ip_len)) {
+#ifdef NET_DEBUG
+ if (debug)
+ printf("readip: bad length %d < %d.\n",
+ (int)n, ntohs(ip->ip_len));
+#endif
+ free(ptr);
+ return (-1);
+ }
+ if (d->myip.s_addr && ip->ip_dst.s_addr != d->myip.s_addr) {
+#ifdef NET_DEBUG
+ if (debug) {
+ printf("readip: bad saddr %s != ", inet_ntoa(d->myip));
+ printf("%s\n", inet_ntoa(ip->ip_dst));
+ }
+#endif
+ free(ptr);
+ return (-1);
+ }
+
+ /* Unfragmented packet. */
+ if ((ntohs(ip->ip_off) & IP_MF) == 0 &&
+ (ntohs(ip->ip_off) & IP_OFFMASK) == 0) {
+ uh = (struct udphdr *)((uintptr_t)ip + sizeof (*ip));
+ /* If there were ip options, make them go away */
+ if (hlen != sizeof(*ip)) {
+ bcopy(((u_char *)ip) + hlen, uh, uh->uh_ulen - hlen);
+ ip->ip_len = htons(sizeof(*ip));
+ n -= hlen - sizeof(*ip);
+ }
+
+ n = (n > (ntohs(ip->ip_len) - sizeof(*ip))) ?
+ ntohs(ip->ip_len) - sizeof(*ip) : n;
+ *pkt = ptr;
+ *payload = (void *)((uintptr_t)ip + sizeof(*ip));
+ return (n);
+ }
+
+ STAILQ_FOREACH(ipr, &ire_list, ip_next) {
+ if (ipr->ip_src.s_addr == ip->ip_src.s_addr &&
+ ipr->ip_dst.s_addr == ip->ip_dst.s_addr &&
+ ipr->ip_id == ip->ip_id &&
+ ipr->ip_proto == ip->ip_p)
+ break;
+ }
+
+ /* Allocate new reassembly entry */
+ if (ipr == NULL) {
+ if ((ipr = calloc(1, sizeof (*ipr))) == NULL) {
+ free(ptr);
+ return (-1);
+ }
+
+ ipr->ip_src = ip->ip_src;
+ ipr->ip_dst = ip->ip_dst;
+ ipr->ip_id = ip->ip_id;
+ ipr->ip_proto = ip->ip_p;
+ ipr->ip_ttl = MAXTTL;
+ STAILQ_INIT(&ipr->ip_queue);
+ STAILQ_INSERT_TAIL(&ire_list, ipr, ip_next);
+ }
+
+ if (ip_reasm_add(ipr, ptr, ip) != 0) {
+ STAILQ_REMOVE(&ire_list, ipr, ip_reasm, ip_next);
+ free(ipr);
+ free(ptr);
+ return (-1);
+ }
+
+ if ((ntohs(ip->ip_off) & IP_MF) == 0) {
+ ipr->ip_total_size = (8 * (ntohs(ip->ip_off) & IP_OFFMASK));
+ ipr->ip_total_size += n + sizeof (*ip);
+ ipr->ip_total_size += sizeof (struct ether_header);
+
+ ipr->ip_pkt = malloc(ipr->ip_total_size + 2);
+ if (ipr->ip_pkt == NULL) {
+ STAILQ_REMOVE(&ire_list, ipr, ip_reasm, ip_next);
+ ip_reasm_free(ipr);
+ return (-1);
+ }
+ }
+
+ /*
+ * If we do not have re-assembly buffer ipr->ip_pkt, we are still
+ * missing fragments, so just restart the read.
+ */
+ if (ipr->ip_pkt == NULL) {
+ errno = EAGAIN;
+ return (-1);
+ }
+
+ /*
+ * Walk the packet list in reassembly queue, if we got all the
+ * fragments, build the packet.
+ */
+ n = 0;
+ last = NULL;
+ STAILQ_FOREACH(ipq, &ipr->ip_queue, ipq_next) {
+ if ((ntohs(ipq->ipq_hdr->ip_off) & IP_OFFMASK) != n / 8) {
+ errno = EAGAIN;
+ return (-1);
+ }
+
+ n += ntohs(ipq->ipq_hdr->ip_len) - (ipq->ipq_hdr->ip_hl << 2);
+ last = ipq;
+ }
+ if ((ntohs(last->ipq_hdr->ip_off) & IP_MF) != 0) {
+ errno = EAGAIN;
+ return (-1);
+ }
+
+ ipq = STAILQ_FIRST(&ipr->ip_queue);
+ /* Fabricate ethernet header */
+ eh = (struct ether_header *)((uintptr_t)ipr->ip_pkt + 2);
+ bcopy((void *)((uintptr_t)ipq->ipq_pkt + 2), eh, sizeof (*eh));
+
+ /* Fabricate IP header */
+ ipr->ip_hdr = (struct ip *)((uintptr_t)eh + sizeof (*eh));
+ bcopy(ipq->ipq_hdr, ipr->ip_hdr, sizeof (*ipr->ip_hdr));
+ ipr->ip_hdr->ip_hl = sizeof (*ipr->ip_hdr) >> 2;
+ ipr->ip_hdr->ip_len = htons(n);
+ ipr->ip_hdr->ip_sum = 0;
+ ipr->ip_hdr->ip_sum = in_cksum(ipr->ip_hdr, sizeof (*ipr->ip_hdr));
+
+ n = 0;
+ ptr = (char *)((uintptr_t)ipr->ip_hdr + sizeof (*ipr->ip_hdr));
+ STAILQ_FOREACH(ipq, &ipr->ip_queue, ipq_next) {
+ char *data;
+ size_t len;
+
+ hlen = ipq->ipq_hdr->ip_hl << 2;
+ len = ntohs(ipq->ipq_hdr->ip_len) - hlen;
+ data = (char *)((uintptr_t)ipq->ipq_hdr + hlen);
+
+ bcopy(data, ptr + n, len);
+ n += len;
+ }
+
+ *pkt = ipr->ip_pkt;
+ ipr->ip_pkt = NULL; /* Avoid free from ip_reasm_free() */
+ *payload = ptr;
+
+ /* Clean up the reassembly list */
+ while ((ipr = STAILQ_FIRST(&ire_list)) != NULL) {
+ STAILQ_REMOVE_HEAD(&ire_list, ip_next);
+ ip_reasm_free(ipr);
+ }
+ return (n);
+}
+
+/*
+ * Receive a IP packet.
+ */
+ssize_t
+readip(struct iodesc *d, void **pkt, void **payload, time_t tleft,
+ uint8_t proto)
+{
+ time_t t;
+ ssize_t ret = -1;
+
+ t = getsecs();
+ while ((getsecs() - t) < tleft) {
+ errno = 0;
+ ret = readipv4(d, pkt, payload, tleft, proto);
+ if (errno != EAGAIN)
+ break;
+ }
+ return (ret);
+}
Modified: head/lib/libstand/net.h
==============================================================================
--- head/lib/libstand/net.h Mon May 15 21:44:40 2017 (r318319)
+++ head/lib/libstand/net.h Mon May 15 21:50:34 2017 (r318320)
@@ -108,6 +108,8 @@ ssize_t sendether(struct iodesc *d, void
u_char *dea, int etype);
ssize_t readether(struct iodesc *, void **, void **, time_t, uint16_t *);
+ssize_t sendip(struct iodesc *, void *, size_t, uint8_t);
+ssize_t readip(struct iodesc *, void **, void **, time_t, uint8_t);
ssize_t sendudp(struct iodesc *, void *, size_t);
ssize_t readudp(struct iodesc *, void **, void **, time_t);
ssize_t sendrecv(struct iodesc *,
Modified: head/lib/libstand/udp.c
==============================================================================
--- head/lib/libstand/udp.c Mon May 15 21:44:40 2017 (r318319)
+++ head/lib/libstand/udp.c Mon May 15 21:50:34 2017 (r318320)
@@ -62,9 +62,8 @@ ssize_t
sendudp(struct iodesc *d, void *pkt, size_t len)
{
ssize_t cc;
- struct ip *ip;
+ struct udpiphdr *ui;
struct udphdr *uh;
- u_char *ea;
#ifdef NET_DEBUG
if (debug) {
@@ -78,52 +77,31 @@ sendudp(struct iodesc *d, void *pkt, siz
}
#endif
- uh = (struct udphdr *)pkt - 1;
- ip = (struct ip *)uh - 1;
- len += sizeof(*ip) + sizeof(*uh);
-
- bzero(ip, sizeof(*ip) + sizeof(*uh));
+ ui = (struct udpiphdr *)pkt - 1;
+ bzero(ui, sizeof(*ui));
- ip->ip_v = IPVERSION; /* half-char */
- ip->ip_hl = sizeof(*ip) >> 2; /* half-char */
- ip->ip_len = htons(len);
- ip->ip_p = IPPROTO_UDP; /* char */
- ip->ip_ttl = IPDEFTTL; /* char */
- ip->ip_src = d->myip;
- ip->ip_dst = d->destip;
- ip->ip_sum = in_cksum(ip, sizeof(*ip)); /* short, but special */
+ uh = (struct udphdr *)pkt - 1;
+ len += sizeof(*uh);
uh->uh_sport = d->myport;
uh->uh_dport = d->destport;
- uh->uh_ulen = htons(len - sizeof(*ip));
+ uh->uh_ulen = htons(len);
-#ifndef UDP_NO_CKSUM
- {
- struct udpiphdr *ui;
- struct ip tip;
+ ui->ui_pr = IPPROTO_UDP;
+ ui->ui_len = uh->uh_ulen;
+ ui->ui_src = d->myip;
+ ui->ui_dst = d->destip;
- /* Calculate checksum (must save and restore ip header) */
- tip = *ip;
- ui = (struct udpiphdr *)ip;
- bzero(&ui->ui_x1, sizeof(ui->ui_x1));
- ui->ui_len = uh->uh_ulen;
- uh->uh_sum = in_cksum(ui, len);
- *ip = tip;
- }
+#ifndef UDP_NO_CKSUM
+ uh->uh_sum = in_cksum(ui, len + sizeof (struct ip));
#endif
- if (ip->ip_dst.s_addr == INADDR_BROADCAST || ip->ip_src.s_addr == 0 ||
- netmask == 0 || SAMENET(ip->ip_src, ip->ip_dst, netmask))
- ea = arpwhohas(d, ip->ip_dst);
- else
- ea = arpwhohas(d, gateip);
-
- cc = sendether(d, ip, len, ea, ETHERTYPE_IP);
+ cc = sendip(d, uh, len, IPPROTO_UDP);
if (cc == -1)
return (-1);
if (cc != len)
panic("sendudp: bad write (%zd != %zd)", cc, len);
- return (cc - (sizeof(*ip) + sizeof(*uh)));
+ return (cc - sizeof(*uh));
}
/*
@@ -133,10 +111,7 @@ ssize_t
readudp(struct iodesc *d, void **pkt, void **payload, time_t tleft)
{
ssize_t n;
- size_t hlen;
- struct ip *ip;
struct udphdr *uh;
- uint16_t etype; /* host order */
void *ptr;
#ifdef NET_DEBUG
@@ -144,84 +119,14 @@ readudp(struct iodesc *d, void **pkt, vo
printf("readudp: called\n");
#endif
- ip = NULL;
+ uh = NULL;
ptr = NULL;
- n = readether(d, &ptr, (void **)&ip, tleft, &etype);
- if (n == -1 || n < sizeof(*ip) + sizeof(*uh)) {
+ n = readip(d, &ptr, (void **)&uh, tleft, IPPROTO_UDP);
+ if (n == -1 || n < sizeof(*uh) || n != ntohs(uh->uh_ulen)) {
free(ptr);
return (-1);
}
- /* Ethernet address checks now in readether() */
-
- /* Need to respond to ARP requests. */
- if (etype == ETHERTYPE_ARP) {
- struct arphdr *ah = (void *)ip;
- if (ah->ar_op == htons(ARPOP_REQUEST)) {
- /* Send ARP reply */
- arp_reply(d, ah);
- }
- free(ptr);
- return (-1);
- }
-
- if (etype != ETHERTYPE_IP) {
-#ifdef NET_DEBUG
- if (debug)
- printf("readudp: not IP. ether_type=%x\n", etype);
-#endif
- free(ptr);
- return (-1);
- }
-
- /* Check ip header */
- if (ip->ip_v != IPVERSION ||
- ip->ip_p != IPPROTO_UDP) { /* half char */
-#ifdef NET_DEBUG
- if (debug)
- printf("readudp: IP version or not UDP. ip_v=%d ip_p=%d\n", ip->ip_v, ip->ip_p);
-#endif
- free(ptr);
- return (-1);
- }
-
- hlen = ip->ip_hl << 2;
- if (hlen < sizeof(*ip) ||
- in_cksum(ip, hlen) != 0) {
-#ifdef NET_DEBUG
- if (debug)
- printf("readudp: short hdr or bad cksum.\n");
-#endif
- free(ptr);
- return (-1);
- }
- if (n < ntohs(ip->ip_len)) {
-#ifdef NET_DEBUG
- if (debug)
- printf("readudp: bad length %d < %d.\n",
- (int)n, ntohs(ip->ip_len));
-#endif
- free(ptr);
- return (-1);
- }
- if (d->myip.s_addr && ip->ip_dst.s_addr != d->myip.s_addr) {
-#ifdef NET_DEBUG
- if (debug) {
- printf("readudp: bad saddr %s != ", inet_ntoa(d->myip));
- printf("%s\n", inet_ntoa(ip->ip_dst));
- }
-#endif
- free(ptr);
- return (-1);
- }
-
- uh = (struct udphdr *)((uintptr_t)ip + sizeof (*ip));
- /* If there were ip options, make them go away */
- if (hlen != sizeof(*ip)) {
- bcopy(((u_char *)ip) + hlen, uh, uh->uh_ulen - hlen);
- ip->ip_len = htons(sizeof(*ip));
- n -= hlen - sizeof(*ip);
- }
if (uh->uh_dport != d->myport) {
#ifdef NET_DEBUG
if (debug)
@@ -235,16 +140,13 @@ readudp(struct iodesc *d, void **pkt, vo
#ifndef UDP_NO_CKSUM
if (uh->uh_sum) {
struct udpiphdr *ui;
+ struct ip *ip;
struct ip tip;
n = ntohs(uh->uh_ulen) + sizeof(*ip);
- if (n > RECV_SIZE - ETHER_SIZE) {
- printf("readudp: huge packet, udp len %d\n", (int)n);
- free(ptr);
- return (-1);
- }
/* Check checksum (must save and restore ip header) */
+ ip = (struct ip *)uh - 1;
tip = *ip;
ui = (struct udpiphdr *)ip;
bzero(&ui->ui_x1, sizeof(ui->ui_x1));
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