[DECNET]: seq file conversions and fixes.

  o Removed blksize from decnet device parameters - use the device mtu like we
    ought to.
  o Removed /proc/net/decnet_route file - I don't think anybody ever used it
    and it was lacking a full enough description of the routes to be useful.
    ip -D route list is much better :-)
  o Added rt_local_src entry to decnet routes so that we get the local source
    address right when forwarding.
  o Added correct proto argument to struct flowi for routing
  o MSG_MORE in sendmsg (ignored, but accepted whereas before we'd error)
  o /proc/net/decnet converted to seq_file
  o /proc/net/decnet_dev converted to seq_file
  o /proc/net/decnet_cache converted to seq_file
  o Use pskb_may_pull() and add code to linearize skbs on the input path
    except for those containing data.
  o Fixed returned packet code (mostly - some left to do)
  o update_pmtu() method for decnet dst entries (ip_gre device assumes this
    method exists - well I think it does :-)
  o Fixed bug in forwarding to get IE bit set correctly
  o Fixed compile bugs with CONFIG_DECNET_ROUTE_FWMARK pointed out by Adrian
    Bunk
  o Fixed zero dest code to grab an address from loopback
  o Fixed local routes in dn_route_output_slow()
  o Fixed error case in dn_route_input/output_slow() pointed out by Rusty

include/net/dn_dev.h

@@ -71,7 +71,6 @@ struct dn_dev_parms {
 #define DN_DEV_MPOINT 4
 	int state;                /* Initial state                      */
 	int forwarding;	          /* 0=EndNode, 1=L1Router, 2=L2Router  */
-	unsigned short blksize;   /* Block Size                         */
 	unsigned long t2;         /* Default value of t2                */
 	unsigned long t3;         /* Default value of t3                */
 	int priority;             /* Priority to be a router            */

include/net/dn_fib.h

@@ -101,10 +101,6 @@ struct dn_fib_table {
 	int (*lookup)(struct dn_fib_table *t, const struct flowi *fl,
 			struct dn_fib_res *res);
 	int (*flush)(struct dn_fib_table *t);
-#ifdef CONFIG_PROC_FS
-	int (*get_info)(struct dn_fib_table *table, char *buf,
-			int first, int count);
-#endif /* CONFIG_PROC_FS */
 	int (*dump)(struct dn_fib_table *t, struct sk_buff *skb, struct netlink_callback *cb);
 
 	unsigned char data[0];
@@ -184,6 +180,9 @@ extern struct dn_fib_table *dn_fib_tables[];
 
 #else /* Endnode */
 
+#define dn_fib_init() (0)
+#define dn_fib_cleanup() (0)
+
 #define dn_fib_lookup(fl, res) (-ESRCH)
 #define dn_fib_info_put(fi) do { } while(0)
 #define dn_fib_select_multipath(fl, res) do { } while(0)

include/net/dn_route.h

@@ -74,7 +74,7 @@ struct dn_route {
 	__u16 rt_saddr;
 	__u16 rt_daddr;
 	__u16 rt_gateway;
-	__u16 __padding;
+	__u16 rt_local_src;	/* Source used for forwarding packets */
 	__u16 rt_src_map;
 	__u16 rt_dst_map;
 

net/decnet/TODO

@@ -23,15 +23,9 @@ Steve's quick list of things that need finishing off:
 
  o check MSG_CTRUNC is set where it should be.
 
- o Start to hack together user level software and add more DECnet support
-   in ifconfig for example. 
-
  o Find all the commonality between DECnet and IPv4 routing code and extract 
    it into a small library of routines. [probably a project for 2.7.xx]
 
- o Add the routing message grabbing netfilter module [written, tested,
-   awaiting merge]
-
  o Add perfect socket hashing - an idea suggested by Paul Koning. Currently
    we have a half-way house scheme which seems to work reasonably well, but
    the full scheme is still worth implementing, its not not top of my list
@@ -45,5 +39,3 @@ Steve's quick list of things that need finishing off:
 
  o AIO for DECnet
 
- o Eliminate dn_db->parms.blksize
-

net/decnet/af_decnet.c

@@ -116,6 +116,7 @@ Version 0.0.6    2.1.110   07-aug-98   Eduardo Marcelo Serrat
 #include <linux/inet.h>
 #include <linux/route.h>
 #include <linux/netfilter.h>
+#include <linux/seq_file.h>
 #include <net/sock.h>
 #include <net/tcp.h>
 #include <net/flow.h>
@@ -676,45 +677,6 @@ char *dn_addr2asc(dn_address addr, char *buf)
 }
 
 
-static char *dn_state2asc(unsigned char state)
-{
-	switch(state) {
-		case DN_O:
-			return "OPEN";
-		case DN_CR:
-			return "  CR";
-		case DN_DR:
-			return "  DR";
-		case DN_DRC:
-			return " DRC";
-		case DN_CC:
-			return "  CC";
-		case DN_CI:
-			return "  CI";
-		case DN_NR:
-			return "  NR";
-		case DN_NC:
-			return "  NC";
-		case DN_CD:
-			return "  CD";
-		case DN_RJ:
-			return "  RJ";
-		case DN_RUN:
-			return " RUN";
-		case DN_DI:
-			return "  DI";
-		case DN_DIC:
-			return " DIC";
-		case DN_DN:
-			return "  DN";
-		case DN_CL:
-			return "  CL";
-		case DN_CN:
-			return "  CN";
-	}
-
-	return "????";
-}
 
 static int dn_create(struct socket *sock, int protocol)
 {
@@ -1001,6 +963,7 @@ static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen,
 	fl.fld_dst = dn_saddr2dn(&scp->peer);
 	fl.fld_src = dn_saddr2dn(&scp->addr);
 	dn_sk_ports_copy(&fl, scp);
+	fl.proto = DNPROTO_NSP;
 	if (dn_route_output_sock(&sk->dst_cache, &fl, sk, flags) < 0)
 		goto out;
 	sk->route_caps = sk->dst_cache->dev->features;
@@ -1964,7 +1927,7 @@ static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
 	unsigned char fctype;
 	long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
 
-	if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL))
+	if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE))
 		return -EOPNOTSUPP;
 
 	if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
@@ -2143,6 +2106,95 @@ static struct packet_type dn_dix_packet_type = {
 	.data =		(void*)1,
 };
 
+#ifdef CONFIG_PROC_FS
+struct dn_iter_state {
+	int bucket;
+};
+
+static struct sock *dn_socket_get_first(struct seq_file *seq)
+{
+	struct dn_iter_state *state = seq->private;
+	struct sock *n = NULL;
+
+	for(state->bucket = 0;
+	    state->bucket < DN_SK_HASH_SIZE;
+	    ++state->bucket) {
+		n = dn_sk_hash[state->bucket];
+		if (n)
+			break;
+	}
+
+	return n;
+}
+
+static struct sock *dn_socket_get_next(struct seq_file *seq,
+				       struct sock *n)
+{
+	struct dn_iter_state *state = seq->private;
+
+	n = n->next;
+try_again:
+	if (n)
+		goto out;
+	if (++state->bucket >= DN_SK_HASH_SIZE)
+		goto out;
+	n = dn_sk_hash[state->bucket];
+	goto try_again;
+out:
+	return n;
+}
+
+static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
+{
+	struct sock *sk = dn_socket_get_first(seq);
+
+	if (sk) {
+		while(*pos && (sk = dn_socket_get_next(seq, sk)))
+			--*pos;
+	}
+	return *pos ? NULL : sk;
+}
+
+static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
+{
+	void *rc;
+	read_lock_bh(&dn_hash_lock);
+	rc = socket_get_idx(seq, &pos);
+	if (!rc) {
+		read_unlock_bh(&dn_hash_lock);
+	}
+	return rc;
+}
+
+static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	return *pos ? dn_socket_get_idx(seq, *pos - 1) : (void*)1;
+}
+
+static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	void *rc;
+
+	if (v == (void*)1) {
+		rc = dn_socket_get_idx(seq, 0);
+		goto out;
+	}
+
+	rc = dn_socket_get_next(seq, v);
+	if (rc)
+		goto out;
+	read_unlock_bh(&dn_hash_lock);
+out:
+	++*pos;
+	return rc;
+}
+
+static void dn_socket_seq_stop(struct seq_file *seq, void *v)
+{
+	if (v && v != (void*)1)
+		read_unlock_bh(&dn_hash_lock);
+}
+
 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
 
 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
@@ -2163,31 +2215,60 @@ static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
     	}
 }
 
-static int dn_get_info(char *buffer, char **start, off_t offset, int length)
+static char *dn_state2asc(unsigned char state)
 {
-	struct sock *sk;
-	struct dn_scp *scp;
-	int len = 0;
-	off_t pos = 0;
-	off_t begin = 0;
+	switch(state) {
+		case DN_O:
+			return "OPEN";
+		case DN_CR:
+			return "  CR";
+		case DN_DR:
+			return "  DR";
+		case DN_DRC:
+			return " DRC";
+		case DN_CC:
+			return "  CC";
+		case DN_CI:
+			return "  CI";
+		case DN_NR:
+			return "  NR";
+		case DN_NC:
+			return "  NC";
+		case DN_CD:
+			return "  CD";
+		case DN_RJ:
+			return "  RJ";
+		case DN_RUN:
+			return " RUN";
+		case DN_DI:
+			return "  DI";
+		case DN_DIC:
+			return " DIC";
+		case DN_DN:
+			return "  DN";
+		case DN_CL:
+			return "  CL";
+		case DN_CN:
+			return "  CN";
+	}
+
+	return "????";
+}
+
+static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
+{
+	struct dn_scp *scp = DN_SK(sk);
 	char buf1[DN_ASCBUF_LEN];
 	char buf2[DN_ASCBUF_LEN];
 	char local_object[DN_MAXOBJL+3];
 	char remote_object[DN_MAXOBJL+3];
-	int i;
-
-	len += sprintf(buffer + len, "Local                                              Remote\n");
-
-	read_lock(&dn_hash_lock);
-	for(i = 0; i < DN_SK_HASH_SIZE; i++) {
-		for(sk = dn_sk_hash[i]; sk != NULL; sk = sk->next) {
-			scp = DN_SK(sk);
 
 	dn_printable_object(&scp->addr, local_object);
 	dn_printable_object(&scp->peer, remote_object);
 
-			len += sprintf(buffer + len,
-					"%6s/%04X %04d:%04d %04d:%04d %01d %-16s %6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
+	seq_printf(seq,
+		   "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
+		   "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
 		   dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
 		   scp->addrloc,
 		   scp->numdat,
@@ -2206,27 +2287,55 @@ static int dn_get_info(char *buffer, char **start, off_t offset, int length)
 		   remote_object,
 		   dn_state2asc(scp->state),
 		   ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
+}
 
-			pos = begin + len;
-			if (pos < offset) {
-				len = 0;
-				begin = pos;
-			}
-			if (pos > (offset + length))
-				break;
-		}
+static int dn_socket_seq_show(struct seq_file *seq, void *v)
+{
+	if (v == (void*)1) {
+		seq_puts(seq, "Local                                              Remote\n");
+	} else {
+		dn_socket_format_entry(seq, v);
 	}
-	read_unlock(&dn_hash_lock);
+	return 0;
+}
 
-	*start = buffer + (offset - begin);
-	len -= (offset - begin);
+static struct seq_operations dn_socket_seq_ops = {
+	.start	= dn_socket_seq_start,
+	.next	= dn_socket_seq_next,
+	.stop	= dn_socket_seq_stop,
+	.show	= dn_socket_seq_show,
+};
 
-	if (len > length)
-		len = length;
+static int dn_socket_seq_open(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq;
+	int rc = -ENOMEM;
+	struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
 
-	return len;
+	if (!s)
+		goto out;
+
+	rc = seq_open(file, &dn_socket_seq_ops);
+	if (rc)
+		goto out_kfree;
+
+	seq		= file->private_data;
+	seq->private	= s;
+	memset(s, 0, sizeof(*s));
+out:
+	return rc;
+out_kfree:
+	kfree(s);
+	goto out;
 }
 
+static struct file_operations dn_socket_seq_fops = {
+	.open		= dn_socket_seq_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release_private,
+};
+#endif
 
 static struct net_proto_family	dn_family_ops = {
 	.family =	AF_DECnet,
@@ -2258,13 +2367,11 @@ static struct proto_ops dn_proto_ops = {
 void dn_register_sysctl(void);
 void dn_unregister_sysctl(void);
 
-
 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
 MODULE_AUTHOR("Linux DECnet Project Team");
 MODULE_LICENSE("GPL");
 
-
-static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.67s (C) 1995-2003 Linux DECnet Project Team\n";
+static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
 
 static int __init decnet_init(void)
 {
@@ -2281,15 +2388,12 @@ static int __init decnet_init(void)
 	dev_add_pack(&dn_dix_packet_type);
 	register_netdevice_notifier(&dn_dev_notifier);
 
-	proc_net_create("decnet", 0, dn_get_info);
+	proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
 
 	dn_neigh_init();
 	dn_dev_init();
 	dn_route_init();
-
-#ifdef CONFIG_DECNET_ROUTER
 	dn_fib_init();
-#endif /* CONFIG_DECNET_ROUTER */
 
 	dn_register_sysctl();
 
@@ -2316,10 +2420,7 @@ static void __exit decnet_exit(void)
 	dn_route_cleanup();
 	dn_dev_cleanup();
 	dn_neigh_cleanup();
-
-#ifdef CONFIG_DECNET_ROUTER
 	dn_fib_cleanup();
-#endif /* CONFIG_DECNET_ROUTER */
 
 	proc_net_remove("decnet");
 

net/decnet/dn_dev.c

@@ -20,6 +20,8 @@
  *          Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
  *          Steve Whitehouse : Removed timer1 - it's a user space issue now
  *         Patrick Caulfield : Fixed router hello message format
+ *          Steve Whitehouse : Got rid of constant sizes for blksize for
+ *                             devices. All mtu based now.
  */
 
 #include <linux/config.h>
@@ -28,6 +30,7 @@
 #include <linux/net.h>
 #include <linux/netdevice.h>
 #include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include <linux/timer.h>
 #include <linux/string.h>
 #include <linux/if_arp.h>
@@ -72,16 +75,13 @@ static void rtmsg_ifa(int event, struct dn_ifaddr *ifa);
 static int dn_eth_up(struct net_device *);
 static void dn_eth_down(struct net_device *);
 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
-#if 0
 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
-#endif
 
 static struct dn_dev_parms dn_dev_list[] =  {
 {
 	.type =		ARPHRD_ETHER, /* Ethernet */
 	.mode =		DN_DEV_BCAST,
 	.state =	DN_DEV_S_RU,
-	.blksize =	1498,
 	.t2 =		1,
 	.t3 =		10,
 	.name =		"ethernet",
@@ -94,7 +94,6 @@ static struct dn_dev_parms dn_dev_list[] =  {
 	.type =		ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
 	.mode =		DN_DEV_BCAST,
 	.state =	DN_DEV_S_RU,
-	.blksize =	1400,
 	.t2 =		1,
 	.t3 =		10,
 	.name =		"ipgre",
@@ -106,7 +105,6 @@ static struct dn_dev_parms dn_dev_list[] =  {
 	.type =		ARPHRD_X25, /* Bog standard X.25 */
 	.mode =		DN_DEV_UCAST,
 	.state =	DN_DEV_S_DS,
-	.blksize =	230,
 	.t2 =		1,
 	.t3 =		120,
 	.name =		"x25",
@@ -119,7 +117,6 @@ static struct dn_dev_parms dn_dev_list[] =  {
 	.type =		ARPHRD_PPP, /* DECnet over PPP */
 	.mode =		DN_DEV_BCAST,
 	.state =	DN_DEV_S_RU,
-	.blksize =	230,
 	.t2 =		1,
 	.t3 =		10,
 	.name =		"ppp",
@@ -127,24 +124,20 @@ static struct dn_dev_parms dn_dev_list[] =  {
 	.timer3 =	dn_send_brd_hello,
 },
 #endif
-#if 0
 {
 	.type =		ARPHRD_DDCMP, /* DECnet over DDCMP */
 	.mode =		DN_DEV_UCAST,
 	.state =	DN_DEV_S_DS,
-	.blksize =	230,
 	.t2 =		1,
 	.t3 =		120,
 	.name =		"ddcmp",
 	.ctl_name =	NET_DECNET_CONF_DDCMP,
 	.timer3 =	dn_send_ptp_hello,
 },
-#endif
 {
 	.type =		ARPHRD_LOOPBACK, /* Loopback interface - always last */
 	.mode =		DN_DEV_BCAST,
 	.state =	DN_DEV_S_RU,
-	.blksize =	1498,
 	.t2 =		1,
 	.t3 =		10,
 	.name =		"loopback",
@@ -254,6 +247,21 @@ static struct dn_dev_sysctl_table {
 	}, {0}}
 };
 
+static inline __u16 mtu2blksize(struct net_device *dev)
+{
+	u32 blksize = dev->mtu;
+	if (blksize > 0xffff)
+		blksize = 0xffff;
+
+	if (dev->type == ARPHRD_ETHER ||
+	    dev->type == ARPHRD_PPP ||
+	    dev->type == ARPHRD_IPGRE ||
+	    dev->type == ARPHRD_LOOPBACK)
+		blksize -= 2;
+
+	return (__u16)blksize;
+}
+
 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 {
 	struct dn_dev_sysctl_table *t;
@@ -858,7 +866,7 @@ static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
         memcpy(msg->tiver, dn_eco_version, 3);
 	dn_dn2eth(msg->id, ifa->ifa_local);
         msg->iinfo   = DN_RT_INFO_ENDN;
-        msg->blksize = dn_htons(dn_db->parms.blksize);
+        msg->blksize = dn_htons(mtu2blksize(dev));
         msg->area    = 0x00;
         memset(msg->seed, 0, 8);
         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
@@ -920,10 +928,10 @@ static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 	unsigned short *pktlen;
 	char *src;
 
-	if (dn_db->parms.blksize < (26 + 7))
+	if (mtu2blksize(dev) < (26 + 7))
 		return;
 
-	n = dn_db->parms.blksize - 26;
+	n = mtu2blksize(dev) - 26;
 	n /= 7;
 
 	if (n > 32)
@@ -946,7 +954,7 @@ static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 	ptr += ETH_ALEN;
 	*ptr++ = dn_db->parms.forwarding == 1 ? 
 			DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
-	*((unsigned short *)ptr) = dn_htons(dn_db->parms.blksize);
+	*((unsigned short *)ptr) = dn_htons(mtu2blksize(dev));
 	ptr += 2;
 	*ptr++ = dn_db->parms.priority; /* Priority */ 
 	*ptr++ = 0; /* Area: Reserved */
@@ -990,16 +998,13 @@ static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 		dn_send_router_hello(dev, ifa);
 }
 
-#if 0
 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 {
 	int tdlen = 16;
 	int size = dev->hard_header_len + 2 + 4 + tdlen;
 	struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
-	struct dn_dev *dn_db = dev->dn_ptr;
 	int i;
 	unsigned char *ptr;
-	struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 	char src[ETH_ALEN];
 
 	if (skb == NULL)
@@ -1020,7 +1025,6 @@ static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 	dn_dn2eth(src, ifa->ifa_local);
 	dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
 }
-#endif
 
 static int dn_eth_up(struct net_device *dev)
 {
@@ -1332,6 +1336,63 @@ int dnet_gifconf(struct net_device *dev, char *buf, int len)
 
 
 #ifdef CONFIG_PROC_FS
+static inline struct net_device *dn_dev_get_next(struct seq_file *seq, struct net_device *dev)
+{
+	do {
+		dev = dev->next;
+	} while(dev && !dev->dn_ptr);
+
+	return dev;
+}
+
+static struct net_device *dn_dev_get_idx(struct seq_file *seq, loff_t pos)
+{
+	struct net_device *dev;
+
+	dev = dev_base;
+	if (dev && !dev->dn_ptr)
+		dev = dn_dev_get_next(seq, dev);
+	if (pos) {
+		while(dev && (dev = dn_dev_get_next(seq, dev)))
+			--pos;
+	}
+	return dev;
+}
+
+static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	if (*pos) {
+		struct net_device *dev;
+		read_lock(&dev_base_lock);
+		dev = dn_dev_get_idx(seq, *pos - 1);
+		if (dev == NULL)
+			read_unlock(&dev_base_lock);
+		return dev;
+	}
+	return (void*)1;
+}
+
+static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct net_device *dev = v;
+	loff_t one = 1;
+
+	if (v == (void*)1) {
+		dev = dn_dev_seq_start(seq, &one);
+	} else {
+		dev = dn_dev_get_next(seq, dev);
+		if (dev == NULL)
+			read_unlock(&dev_base_lock);
+	}
+	++*pos;
+	return dev;
+}
+
+static void dn_dev_seq_stop(struct seq_file *seq, void *v)
+{
+	if (v && v != (void*)1)
+		read_unlock(&dev_base_lock);
+}
 
 static char *dn_type2asc(char type)
 {
@@ -1347,56 +1408,50 @@ static char *dn_type2asc(char type)
 	return "?";
 }
 
-static int decnet_dev_get_info(char *buffer, char **start, off_t offset, int length)
+static int dn_dev_seq_show(struct seq_file *seq, void *v)
 {
-        struct dn_dev *dn_db;
-	struct net_device *dev;
-        int len = 0;
-        off_t pos = 0;
-        off_t begin = 0;
+	if (v == (void*)1)
+        	seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
+	else {
+		struct net_device *dev = v;
 		char peer_buf[DN_ASCBUF_LEN];
 		char router_buf[DN_ASCBUF_LEN];
+		struct dn_dev *dn_db = dev->dn_ptr;
 
-
-        len += sprintf(buffer, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
-
-	read_lock(&dev_base_lock);
-        for (dev = dev_base; dev; dev = dev->next) {
-		if ((dn_db = (struct dn_dev *)dev->dn_ptr) == NULL)
-			continue;
-
-                len += sprintf(buffer + len, "%-8s %1s     %04u %04u   %04lu %04lu   %04hu    %03d %02x    %-10s %-7s %-7s\n",
+                seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
+				"   %04hu    %03d %02x    %-10s %-7s %-7s\n",
                              	dev->name ? dev->name : "???",
                              	dn_type2asc(dn_db->parms.mode),
                              	0, 0,
 				dn_db->t3, dn_db->parms.t3,
-				dn_db->parms.blksize,
+				mtu2blksize(dev),
 				dn_db->parms.priority,
 				dn_db->parms.state, dn_db->parms.name,
 				dn_db->router ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->router->primary_key), router_buf) : "",
 				dn_db->peer ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->peer->primary_key), peer_buf) : "");
-
-
-                pos = begin + len;
-
-                if (pos < offset) {
-                        len   = 0;
-                        begin = pos;
 	}
-                if (pos > offset + length)
-                        break;
-        }
-
-	read_unlock(&dev_base_lock);
-
-        *start = buffer + (offset - begin);
-        len   -= (offset - begin);
+	return 0;
+}
 
-        if (len > length) len = length;
+static struct seq_operations dn_dev_seq_ops = {
+	.start	= dn_dev_seq_start,
+	.next	= dn_dev_seq_next,
+	.stop	= dn_dev_seq_stop,
+	.show	= dn_dev_seq_show,
+};
 
-        return(len);
+static int dn_dev_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &dn_dev_seq_ops);
 }
 
+static struct file_operations dn_dev_seq_fops = {
+	.open	 = dn_dev_seq_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = seq_release,
+};
+
 #endif /* CONFIG_PROC_FS */
 
 static struct rtnetlink_link dnet_rtnetlink_table[RTM_MAX-RTM_BASE+1] = 
@@ -1448,9 +1503,7 @@ void __init dn_dev_init(void)
 
 	rtnetlink_links[PF_DECnet] = dnet_rtnetlink_table;
 
-#ifdef CONFIG_PROC_FS
-	proc_net_create("decnet_dev", 0, decnet_dev_get_info);
-#endif /* CONFIG_PROC_FS */
+	proc_net_fops_create("decnet_dev", S_IRUGO, &dn_dev_seq_fops);
 
 #ifdef CONFIG_SYSCTL
 	{

net/decnet/dn_fib.c

@@ -67,18 +67,18 @@ static struct
 	int error;
 	u8 scope;
 } dn_fib_props[RTA_MAX+1] = {
-	{ .error = 0, .scope = RT_SCOPE_NOWHERE },	  /* RTN_UNSPEC */
-	{ .error = 0, .scope = RT_SCOPE_UNIVERSE },	  /* RTN_UNICAST */
-	{ .error = 0, .scope = RT_SCOPE_HOST },		  /* RTN_LOCAL */
-	{ .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },  /* RTN_BROADCAST */
-	{ .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },  /* RTN_ANYCAST */
-	{ .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },  /* RTN_MULTICAST */
-	{ .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE }, /* RTN_BLACKHOLE */
-	{ .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },	/* RTN_UNREACHABLE */
-	{ .error = -EACCES, .scope = RT_SCOPE_UNIVERSE }, /* RTN_PROHIBIT */
-	{ .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE }, /* RTN_THROW */
-	{ .error = 0, .scope = RT_SCOPE_NOWHERE },  /* RTN_NAT */
-	{ .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }	  /* RTN_XRESOLVE */
+	[RTN_UNSPEC] =      { .error = 0,       .scope = RT_SCOPE_NOWHERE },
+	[RTN_UNICAST] =     { .error = 0,       .scope = RT_SCOPE_UNIVERSE },
+	[RTN_LOCAL] =       { .error = 0,       .scope = RT_SCOPE_HOST },
+	[RTN_BROADCAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+	[RTN_ANYCAST] =     { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+	[RTN_MULTICAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+	[RTN_BLACKHOLE] =   { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
+	[RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
+	[RTN_PROHIBIT] =    { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
+	[RTN_THROW] =       { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
+	[RTN_NAT] =         { .error = 0,       .scope = RT_SCOPE_NOWHERE },
+	[RTN_XRESOLVE] =    { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
 };
 
 void dn_fib_free_info(struct dn_fib_info *fi)
@@ -792,53 +792,12 @@ void dn_fib_flush(void)
                 dn_rt_cache_flush(-1);
 }
 
-#ifdef CONFIG_PROC_FS
-
-static int decnet_rt_get_info(char *buffer, char **start, off_t offset, int length)
-{
-        int first = offset / 128;
-        char *ptr = buffer;
-        int count = (length + 127) / 128;
-        int len;
-        int i;
-        struct dn_fib_table *tb;
-
-        *start = buffer + (offset % 128);
-
-        if (--first < 0) {
-                sprintf(buffer, "%-127s\n", "Iface\tDest\tGW  \tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU\tWindow\tIRTT");
-                --count;
-                ptr += 128;
-                first = 0;
-        }
-
-
-        for(i = RT_MIN_TABLE; (i <= RT_TABLE_MAX) && (count > 0); i++) {
-                if ((tb = dn_fib_get_table(i, 0)) != NULL) {
-                        int n = tb->get_info(tb, ptr, first, count);
-                        count -= n;
-                        ptr += n * 128;
-                }
-        }
-
-        len = ptr - *start;
-        if (len >= length)
-                return length;
-        if (len >= 0)
-                return len;
-
-        return 0;
-}
-#endif /* CONFIG_PROC_FS */
-
 static struct notifier_block dn_fib_dnaddr_notifier = {
 	.notifier_call = dn_fib_dnaddr_event,
 };
 
 void __exit dn_fib_cleanup(void)
 {
-	proc_net_remove("decnet_route");
-
 	dn_fib_table_cleanup();
 	dn_fib_rules_cleanup();
 
@@ -849,10 +808,6 @@ void __exit dn_fib_cleanup(void)
 void __init dn_fib_init(void)
 {
 
-#ifdef CONFIG_PROC_FS
-	proc_net_create("decnet_route", 0, decnet_rt_get_info);
-#endif
-
 	dn_fib_table_init();
 	dn_fib_rules_init();
 

net/decnet/dn_neigh.c

@@ -202,7 +202,7 @@ static int dn_neigh_output_packet(struct sk_buff *skb)
 	struct net_device *dev = neigh->dev;
 	char mac_addr[ETH_ALEN];
 
-	dn_dn2eth(mac_addr, rt->rt_saddr);
+	dn_dn2eth(mac_addr, rt->rt_local_src);
 	if (!dev->hard_header || dev->hard_header(skb, dev, ntohs(skb->protocol), neigh->ha, mac_addr, skb->len) >= 0)
 		return neigh->ops->queue_xmit(skb);
 
@@ -692,48 +692,23 @@ static int dn_neigh_seq_open(struct inode *inode, struct file *file)
 	goto out;
 }
 
-static int dn_seq_release(struct inode *inode, struct file *file)
-{
-	struct seq_file *seq  = (struct seq_file *)file->private_data;
-
-	kfree(seq->private);
-	seq->private = NULL;
-	return seq_release(inode, file);
-}
-
 static struct file_operations dn_neigh_seq_fops = {
 	.open		= dn_neigh_seq_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
-	.release	= dn_seq_release,
+	.release	= seq_release_private,
 };
 
-static int __init dn_neigh_proc_init(void)
-{
-	int rc = 0;
-	struct proc_dir_entry *p = create_proc_entry("decnet_neigh", S_IRUGO, proc_net);
-	if (p)
-		p->proc_fops = &dn_neigh_seq_fops;
-	else
-		rc = -ENOMEM;
-	return rc;
-}
-
-#else
-static int __init dn_neigh_proc_init(void)
-{
-	return 0;
-}
 #endif
 
 void __init dn_neigh_init(void)
 {
 	neigh_table_init(&dn_neigh_table);
-
-	dn_neigh_proc_init();
+	proc_net_fops_create("decnet_neigh", S_IRUGO, &dn_neigh_seq_fops);
 }
 
 void __exit dn_neigh_cleanup(void)
 {
+	proc_net_remove("decnet_neigh");
 	neigh_table_clear(&dn_neigh_table);
 }

net/decnet/dn_nsp_in.c

@@ -28,6 +28,7 @@
  *    Steve Whitehouse:  Added backlog congestion level return codes.
  *   Patrick Caulfield:
  *    Steve Whitehouse:  Added flow control support (outbound)
+ *    Steve Whitehouse:  Prepare for nonlinear skbs
  */
 
 /******************************************************************************
@@ -240,7 +241,7 @@ static struct sock *dn_find_listener(struct sk_buff *skb, unsigned short *reason
 	cb->info     = msg->info;
 	cb->segsize  = dn_ntohs(msg->segsize);
 
-	if (skb->len < sizeof(*msg))
+	if (!pskb_may_pull(skb, sizeof(*msg)))
 		goto err_out;
 
 	skb_pull(skb, sizeof(*msg));
@@ -721,33 +722,18 @@ static int dn_nsp_rx_packet(struct sk_buff *skb)
 	unsigned char *ptr = (unsigned char *)skb->data;
 	unsigned short reason = NSP_REASON_NL;
 
+	if (!pskb_may_pull(skb, 2))
+		goto free_out;
+
 	skb->h.raw    = skb->data;
 	cb->nsp_flags = *ptr++;
 
 	if (decnet_debug_level & 2)
 		printk(KERN_DEBUG "dn_nsp_rx: Message type 0x%02x\n", (int)cb->nsp_flags);
 
-	if (skb->len < 2) 
-		goto free_out;
-
 	if (cb->nsp_flags & 0x83) 
 		goto free_out;
 
-	/*
-	 * Returned packets...
-	 * Swap src & dst and look up in the normal way.
-	 */
-	if (cb->rt_flags & DN_RT_F_RTS) {
-		unsigned short tmp = cb->dst_port;
-		cb->dst_port = cb->src_port;
-		cb->src_port = tmp;
-		tmp = cb->dst;
-		cb->dst = cb->src;
-		cb->src = tmp;
-		sk = dn_find_by_skb(skb);
-		goto got_it;
-	}
-
 	/*
 	 * Filter out conninits and useless packet types
 	 */
@@ -759,12 +745,14 @@ static int dn_nsp_rx_packet(struct sk_buff *skb)
 				goto free_out;
 			case 0x10:
 			case 0x60:
+				if (unlikely(cb->rt_flags & DN_RT_F_RTS))
+					goto free_out;
 				sk = dn_find_listener(skb, &reason);
 				goto got_it;
 		}
 	}
 
-	if (skb->len < 3)
+	if (!pskb_may_pull(skb, 3))
 		goto free_out;
 
 	/*
@@ -777,12 +765,25 @@ static int dn_nsp_rx_packet(struct sk_buff *skb)
 	/*
 	 * If not a connack, grab the source address too.
 	 */
-	if (skb->len >= 5) {
+	if (pskb_may_pull(skb, 5)) {
 		cb->src_port = *(unsigned short *)ptr;
 		ptr += 2;
 		skb_pull(skb, 5);
 	}
 
+	/*
+	 * Returned packets...
+	 * Swap src & dst and look up in the normal way.
+	 */
+	if (unlikely(cb->rt_flags & DN_RT_F_RTS)) {
+		unsigned short tmp = cb->dst_port;
+		cb->dst_port = cb->src_port;
+		cb->src_port = tmp;
+		tmp = cb->dst;
+		cb->dst = cb->src;
+		cb->src = tmp;
+	}
+
 	/*
 	 * Find the socket to which this skb is destined.
 	 */
@@ -795,6 +796,15 @@ static int dn_nsp_rx_packet(struct sk_buff *skb)
 		/* Reset backoff */
 		scp->nsp_rxtshift = 0;
 
+		/*
+		 * We linearize everything except data segments here.
+		 */
+		if (cb->nsp_flags & ~0x60) {
+			if (unlikely(skb_is_nonlinear(skb)) &&
+			    skb_linearize(skb, GFP_ATOMIC) != 0)
+				goto free_out;
+		}
+
 		bh_lock_sock(sk);
 		ret = NET_RX_SUCCESS;
 		if (decnet_debug_level & 8)
@@ -835,7 +845,10 @@ int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb)
 	struct dn_skb_cb *cb = DN_SKB_CB(skb);
 
 	if (cb->rt_flags & DN_RT_F_RTS) {
+		if (cb->nsp_flags == 0x18 || cb->nsp_flags == 0x68)
 			dn_returned_conn_init(sk, skb);
+		else
+			kfree_skb(skb);
 		return NET_RX_SUCCESS;
 	}
 

net/decnet/dn_nsp_out.c

@@ -96,6 +96,7 @@ static void dn_nsp_send(struct sk_buff *skb)
 	fl.fld_src = dn_saddr2dn(&scp->addr);
 	fl.fld_dst = dn_saddr2dn(&scp->peer);
 	dn_sk_ports_copy(&fl, scp);
+	fl.proto = DNPROTO_NSP;
 	if (dn_route_output_sock(&sk->dst_cache, &fl, sk, 0) == 0) {
 		dst = sk_dst_get(sk);
 		sk->route_caps = dst->dev->features;
@@ -349,8 +350,7 @@ static inline unsigned char *dn_mk_common_header(struct dn_scp *scp, struct sk_b
 {
 	unsigned char *ptr = skb_push(skb, len);
 
-	if (len < 5)
-		BUG();
+	BUG_ON(len < 5);
 
 	*ptr++ = msgflag;
 	*((unsigned short *)ptr) = scp->addrrem;
@@ -367,8 +367,7 @@ static unsigned short *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, un
 	unsigned short ackcrs = scp->numoth_rcv & 0x0FFF;
 	unsigned short *ptr;
 
-	if (hlen < 9)
-		BUG();
+	BUG_ON(hlen < 9);
 
 	scp->ackxmt_dat = acknum;
 	scp->ackxmt_oth = ackcrs;
@@ -485,8 +484,8 @@ int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff
 		 * We don't expect to see acknowledgements for packets we
 		 * haven't sent yet.
 		 */
-		if (xmit_count == 0)
-			BUG();
+		WARN_ON(xmit_count == 0);
+
 		/*
 		 * If the packet has only been sent once, we can use it
 		 * to calculate the RTT and also open the window a little

net/decnet/dn_table.c

@@ -744,86 +744,6 @@ static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct flowi *flp,
         return err;
 }
 
-#ifdef CONFIG_PROC_FS
-
-static unsigned dn_fib_flag_trans(int type, int dead, u16 mask, struct dn_fib_info *fi)
-{
-	static unsigned type2flags[RTN_MAX+1] = {
-		0, 0, 0, 0, 0, 0, 0, RTF_REJECT, RTF_REJECT, 0, 0, 0
-	};
-	unsigned flags = type2flags[type];
-
-	if (fi && fi->fib_nh->nh_gw)
-		flags |= RTF_GATEWAY;
-	if (mask == 0xFFFF)
-		flags |= RTF_HOST;
-	if (dead)
-		flags |= RTF_UP;
-	return flags;
-}
-
-static void dn_fib_node_get_info(int type, int dead, struct dn_fib_info *fi, u16 prefix, u16 mask, char *buffer)
-{
-	int len;
-	unsigned flags = dn_fib_flag_trans(type, dead, mask, fi);
-
-	if (fi) {
-		len = sprintf(buffer, "%s\t%04x\t%04x\t%04x\t%d\t%u\t%d\t%04x\t%d\t%u\t%u",
-				fi->dn_fib_dev ? fi->dn_fib_dev->name : "*", prefix,
-				fi->fib_nh->nh_gw, flags, 0, 0, fi->fib_priority,
-				mask, 0, 0, 0);
-	} else {
-		len = sprintf(buffer, "*\t%04x\t%04x\t%04x\t%d\t%u\t%d\t%04x\t%d\t%u\t%u",
-					prefix, 0,
-					flags, 0, 0, 0,
-					mask, 0, 0, 0);
-	}
-	memset(buffer+len, ' ', 127-len);
-	buffer[127] = '\n';
-}
-
-static int dn_fib_table_get_info(struct dn_fib_table *tb, char *buffer, int first, int count)
-{
-	struct dn_hash *table = (struct dn_hash *)tb->data;
-	struct dn_zone *dz;
-	int pos = 0;
-	int n = 0;
-
-	read_lock(&dn_fib_tables_lock);
-	for(dz = table->dh_zone_list; dz; dz = dz->dz_next) {
-		int i;
-		struct dn_fib_node *f;
-		int maxslot = dz->dz_divisor;
-		struct dn_fib_node **fp = dz->dz_hash;
-
-		if (dz->dz_nent == 0)
-			continue;
-
-		if (pos + dz->dz_nent < first) {
-			pos += dz->dz_nent;
-			continue;
-		}
-
-		for(i = 0; i < maxslot; i++, fp++) {
-			for(f = *fp; f ; f = f->fn_next) {
-				if (++pos <= first)
-					continue;
-				dn_fib_node_get_info(f->fn_type,
-						f->fn_state & DN_S_ZOMBIE,
-						DN_FIB_INFO(f),
-						dz_prefix(f->fn_key, dz),
-						DZ_MASK(dz), buffer);
-				buffer += 128;
-				if (++n >= count)
-					goto out;
-			}
-		}
-	}
-out:
-	read_unlock(&dn_fib_tables_lock);
-	return n;
-}
-#endif /* CONFIG_PROC_FS */
 
 struct dn_fib_table *dn_fib_get_table(int n, int create)
 {
@@ -855,9 +775,6 @@ struct dn_fib_table *dn_fib_get_table(int n, int create)
         t->delete = dn_fib_table_delete;
         t->lookup = dn_fib_table_lookup;
         t->flush  = dn_fib_table_flush;
-#ifdef CONFIG_PROC_FS
-	t->get_info = dn_fib_table_get_info;
-#endif
         t->dump = dn_fib_table_dump;
 	memset(t->data, 0, sizeof(struct dn_hash));
         dn_fib_tables[n] = t;