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-rw-r--r--net/appletalk/ddp.c79
1 files changed, 28 insertions, 51 deletions
diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 96dc6bb52d14..708e2e0371af 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -1002,7 +1002,7 @@ static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
return sum;
}
-static unsigned short atalk_checksum(const struct sk_buff *skb, int len)
+static __be16 atalk_checksum(const struct sk_buff *skb, int len)
{
unsigned long sum;
@@ -1010,7 +1010,7 @@ static unsigned short atalk_checksum(const struct sk_buff *skb, int len)
sum = atalk_sum_skb(skb, 4, len-4, 0);
/* Use 0xFFFF for 0. 0 itself means none */
- return sum ? htons((unsigned short)sum) : 0xFFFF;
+ return sum ? htons((unsigned short)sum) : htons(0xFFFF);
}
static struct proto ddp_proto = {
@@ -1289,7 +1289,7 @@ static int handle_ip_over_ddp(struct sk_buff *skb)
#endif
static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
- struct ddpehdr *ddp, struct ddpebits *ddphv,
+ struct ddpehdr *ddp, __u16 len_hops,
int origlen)
{
struct atalk_route *rt;
@@ -1317,10 +1317,12 @@ static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
/* Route the packet */
rt = atrtr_find(&ta);
- if (!rt || ddphv->deh_hops == DDP_MAXHOPS)
+ /* increment hops count */
+ len_hops += 1 << 10;
+ if (!rt || !(len_hops & (15 << 10)))
goto free_it;
+
/* FIXME: use skb->cb to be able to use shared skbs */
- ddphv->deh_hops++;
/*
* Route goes through another gateway, so set the target to the
@@ -1335,11 +1337,10 @@ static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
/* Fix up skb->len field */
skb_trim(skb, min_t(unsigned int, origlen,
(rt->dev->hard_header_len +
- ddp_dl->header_length + ddphv->deh_len)));
+ ddp_dl->header_length + (len_hops & 1023))));
- /* Mend the byte order */
/* FIXME: use skb->cb to be able to use shared skbs */
- *((__u16 *)ddp) = ntohs(*((__u16 *)ddphv));
+ ddp->deh_len_hops = htons(len_hops);
/*
* Send the buffer onwards
@@ -1394,7 +1395,7 @@ static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
struct atalk_iface *atif;
struct sockaddr_at tosat;
int origlen;
- struct ddpebits ddphv;
+ __u16 len_hops;
/* Don't mangle buffer if shared */
if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
@@ -1406,16 +1407,11 @@ static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
ddp = ddp_hdr(skb);
- /*
- * Fix up the length field [Ok this is horrible but otherwise
- * I end up with unions of bit fields and messy bit field order
- * compiler/endian dependencies..]
- */
- *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
+ len_hops = ntohs(ddp->deh_len_hops);
/* Trim buffer in case of stray trailing data */
origlen = skb->len;
- skb_trim(skb, min_t(unsigned int, skb->len, ddphv.deh_len));
+ skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
/*
* Size check to see if ddp->deh_len was crap
@@ -1430,7 +1426,7 @@ static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
* valid for net byte orders all over the networking code...
*/
if (ddp->deh_sum &&
- atalk_checksum(skb, ddphv.deh_len) != ddp->deh_sum)
+ atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
/* Not a valid AppleTalk frame - dustbin time */
goto freeit;
@@ -1444,7 +1440,7 @@ static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
/* Not ours, so we route the packet via the correct
* AppleTalk iface
*/
- atalk_route_packet(skb, dev, ddp, &ddphv, origlen);
+ atalk_route_packet(skb, dev, ddp, len_hops, origlen);
goto out;
}
@@ -1489,7 +1485,7 @@ static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
/* Find our address */
struct atalk_addr *ap = atalk_find_dev_addr(dev);
- if (!ap || skb->len < sizeof(struct ddpshdr))
+ if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
goto freeit;
/* Don't mangle buffer if shared */
@@ -1519,11 +1515,8 @@ static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
/*
* Not sure about this bit...
*/
- ddp->deh_len = skb->len;
- ddp->deh_hops = DDP_MAXHOPS; /* Non routable, so force a drop
- if we slip up later */
- /* Mend the byte order */
- *((__u16 *)ddp) = htons(*((__u16 *)ddp));
+ /* Non routable, so force a drop if we slip up later */
+ ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
}
skb->h.raw = skb->data;
@@ -1622,16 +1615,7 @@ static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr
SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
- ddp->deh_pad = 0;
- ddp->deh_hops = 0;
- ddp->deh_len = len + sizeof(*ddp);
- /*
- * Fix up the length field [Ok this is horrible but otherwise
- * I end up with unions of bit fields and messy bit field order
- * compiler/endian dependencies..
- */
- *((__u16 *)ddp) = ntohs(*((__u16 *)ddp));
-
+ ddp->deh_len_hops = htons(len + sizeof(*ddp));
ddp->deh_dnet = usat->sat_addr.s_net;
ddp->deh_snet = at->src_net;
ddp->deh_dnode = usat->sat_addr.s_node;
@@ -1712,8 +1696,8 @@ static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr
struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
struct ddpehdr *ddp;
int copied = 0;
+ int offset = 0;
int err = 0;
- struct ddpebits ddphv;
struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
flags & MSG_DONTWAIT, &err);
if (!skb)
@@ -1721,25 +1705,18 @@ static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr
/* FIXME: use skb->cb to be able to use shared skbs */
ddp = ddp_hdr(skb);
- *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
+ copied = ntohs(ddp->deh_len_hops) & 1023;
- if (sk->sk_type == SOCK_RAW) {
- copied = ddphv.deh_len;
- if (copied > size) {
- copied = size;
- msg->msg_flags |= MSG_TRUNC;
- }
+ if (sk->sk_type != SOCK_RAW) {
+ offset = sizeof(*ddp);
+ copied -= offset;
+ }
- err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
- } else {
- copied = ddphv.deh_len - sizeof(*ddp);
- if (copied > size) {
- copied = size;
- msg->msg_flags |= MSG_TRUNC;
- }
- err = skb_copy_datagram_iovec(skb, sizeof(*ddp),
- msg->msg_iov, copied);
+ if (copied > size) {
+ copied = size;
+ msg->msg_flags |= MSG_TRUNC;
}
+ err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied);
if (!err) {
if (sat) {
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-02 18:04:54 +0000