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-rw-r--r--net/x25/Makefile2
-rw-r--r--net/x25/af_x25.c34
-rw-r--r--net/x25/sysctl_net_x25.c8
-rw-r--r--net/x25/x25_dev.c14
-rw-r--r--net/x25/x25_facilities.c12
-rw-r--r--net/x25/x25_forward.c163
-rw-r--r--net/x25/x25_proc.c98
-rw-r--r--net/x25/x25_route.c3
8 files changed, 318 insertions, 16 deletions
diff --git a/net/x25/Makefile b/net/x25/Makefile
index 587a71aa411d..a2c34ab6f194 100644
--- a/net/x25/Makefile
+++ b/net/x25/Makefile
@@ -6,5 +6,5 @@ obj-$(CONFIG_X25) += x25.o
x25-y := af_x25.o x25_dev.o x25_facilities.o x25_in.o \
x25_link.o x25_out.o x25_route.o x25_subr.o \
- x25_timer.o x25_proc.o
+ x25_timer.o x25_proc.o x25_forward.o
x25-$(CONFIG_SYSCTL) += sysctl_net_x25.o
diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index 52a2726d327f..b37d894358ec 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -63,6 +63,7 @@ int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
+int sysctl_x25_forward = 0;
HLIST_HEAD(x25_list);
DEFINE_RWLOCK(x25_list_lock);
@@ -484,8 +485,6 @@ out:
return sk;
}
-void x25_init_timers(struct sock *sk);
-
static int x25_create(struct socket *sock, int protocol)
{
struct sock *sk;
@@ -848,7 +847,7 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
struct x25_address source_addr, dest_addr;
struct x25_facilities facilities;
struct x25_dte_facilities dte_facilities;
- int len, rc;
+ int len, addr_len, rc;
/*
* Remove the LCI and frame type.
@@ -859,7 +858,8 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
* Extract the X.25 addresses and convert them to ASCII strings,
* and remove them.
*/
- skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
+ addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
+ skb_pull(skb, addr_len);
/*
* Get the length of the facilities, skip past them for the moment
@@ -875,11 +875,28 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
sk = x25_find_listener(&source_addr,skb);
skb_push(skb,len);
+ if (sk != NULL && sk_acceptq_is_full(sk)) {
+ goto out_sock_put;
+ }
+
/*
- * We can't accept the Call Request.
+ * We dont have any listeners for this incoming call.
+ * Try forwarding it.
*/
- if (sk == NULL || sk_acceptq_is_full(sk))
- goto out_clear_request;
+ if (sk == NULL) {
+ skb_push(skb, addr_len + X25_STD_MIN_LEN);
+ if (sysctl_x25_forward &&
+ x25_forward_call(&dest_addr, nb, skb, lci) > 0)
+ {
+ /* Call was forwarded, dont process it any more */
+ kfree_skb(skb);
+ rc = 1;
+ goto out;
+ } else {
+ /* No listeners, can't forward, clear the call */
+ goto out_clear_request;
+ }
+ }
/*
* Try to reach a compromise on the requested facilities.
@@ -1600,6 +1617,9 @@ void x25_kill_by_neigh(struct x25_neigh *nb)
x25_disconnect(s, ENETUNREACH, 0, 0);
write_unlock_bh(&x25_list_lock);
+
+ /* Remove any related forwards */
+ x25_clear_forward_by_dev(nb->dev);
}
static int __init x25_init(void)
diff --git a/net/x25/sysctl_net_x25.c b/net/x25/sysctl_net_x25.c
index aabda59c824e..2b2e7fd689f3 100644
--- a/net/x25/sysctl_net_x25.c
+++ b/net/x25/sysctl_net_x25.c
@@ -73,6 +73,14 @@ static struct ctl_table x25_table[] = {
.extra1 = &min_timer,
.extra2 = &max_timer,
},
+ {
+ .ctl_name = NET_X25_FORWARD,
+ .procname = "x25_forward",
+ .data = &sysctl_x25_forward,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
{ 0, },
};
diff --git a/net/x25/x25_dev.c b/net/x25/x25_dev.c
index 47b68a301677..f099fd6a7c0e 100644
--- a/net/x25/x25_dev.c
+++ b/net/x25/x25_dev.c
@@ -56,6 +56,7 @@ static int x25_receive_data(struct sk_buff *skb, struct x25_neigh *nb)
sk_add_backlog(sk, skb);
}
bh_unlock_sock(sk);
+ sock_put(sk);
return queued;
}
@@ -66,9 +67,18 @@ static int x25_receive_data(struct sk_buff *skb, struct x25_neigh *nb)
return x25_rx_call_request(skb, nb, lci);
/*
- * Its not a Call Request, nor is it a control frame.
- * Let caller throw it away.
+ * Its not a Call Request, nor is it a control frame.
+ * Can we forward it?
*/
+
+ if (x25_forward_data(lci, nb, skb)) {
+ if (frametype == X25_CLEAR_CONFIRMATION) {
+ x25_clear_forward_by_lci(lci);
+ }
+ kfree_skb(skb);
+ return 1;
+ }
+
/*
x25_transmit_clear_request(nb, lci, 0x0D);
*/
diff --git a/net/x25/x25_facilities.c b/net/x25/x25_facilities.c
index 9f42b9c9de37..27f5cc7966f6 100644
--- a/net/x25/x25_facilities.c
+++ b/net/x25/x25_facilities.c
@@ -254,7 +254,7 @@ int x25_negotiate_facilities(struct sk_buff *skb, struct sock *sk,
* They want reverse charging, we won't accept it.
*/
if ((theirs.reverse & 0x01 ) && (ours->reverse & 0x01)) {
- SOCK_DEBUG(sk, "X.25: rejecting reverse charging request");
+ SOCK_DEBUG(sk, "X.25: rejecting reverse charging request\n");
return -1;
}
@@ -262,29 +262,29 @@ int x25_negotiate_facilities(struct sk_buff *skb, struct sock *sk,
if (theirs.throughput) {
if (theirs.throughput < ours->throughput) {
- SOCK_DEBUG(sk, "X.25: throughput negotiated down");
+ SOCK_DEBUG(sk, "X.25: throughput negotiated down\n");
new->throughput = theirs.throughput;
}
}
if (theirs.pacsize_in && theirs.pacsize_out) {
if (theirs.pacsize_in < ours->pacsize_in) {
- SOCK_DEBUG(sk, "X.25: packet size inwards negotiated down");
+ SOCK_DEBUG(sk, "X.25: packet size inwards negotiated down\n");
new->pacsize_in = theirs.pacsize_in;
}
if (theirs.pacsize_out < ours->pacsize_out) {
- SOCK_DEBUG(sk, "X.25: packet size outwards negotiated down");
+ SOCK_DEBUG(sk, "X.25: packet size outwards negotiated down\n");
new->pacsize_out = theirs.pacsize_out;
}
}
if (theirs.winsize_in && theirs.winsize_out) {
if (theirs.winsize_in < ours->winsize_in) {
- SOCK_DEBUG(sk, "X.25: window size inwards negotiated down");
+ SOCK_DEBUG(sk, "X.25: window size inwards negotiated down\n");
new->winsize_in = theirs.winsize_in;
}
if (theirs.winsize_out < ours->winsize_out) {
- SOCK_DEBUG(sk, "X.25: window size outwards negotiated down");
+ SOCK_DEBUG(sk, "X.25: window size outwards negotiated down\n");
new->winsize_out = theirs.winsize_out;
}
}
diff --git a/net/x25/x25_forward.c b/net/x25/x25_forward.c
new file mode 100644
index 000000000000..d339e0c810a8
--- /dev/null
+++ b/net/x25/x25_forward.c
@@ -0,0 +1,163 @@
+/*
+ * This module:
+ * This module is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * History
+ * 03-01-2007 Added forwarding for x.25 Andrew Hendry
+ */
+#include <linux/if_arp.h>
+#include <linux/init.h>
+#include <net/x25.h>
+
+struct list_head x25_forward_list = LIST_HEAD_INIT(x25_forward_list);
+DEFINE_RWLOCK(x25_forward_list_lock);
+
+int x25_forward_call(struct x25_address *dest_addr, struct x25_neigh *from,
+ struct sk_buff *skb, int lci)
+{
+ struct x25_route *rt;
+ struct x25_neigh *neigh_new = NULL;
+ struct list_head *entry;
+ struct x25_forward *x25_frwd, *new_frwd;
+ struct sk_buff *skbn;
+ short same_lci = 0;
+ int rc = 0;
+
+ if ((rt = x25_get_route(dest_addr)) != NULL) {
+
+ if ((neigh_new = x25_get_neigh(rt->dev)) == NULL) {
+ /* This shouldnt happen, if it occurs somehow
+ * do something sensible
+ */
+ goto out_put_route;
+ }
+
+ /* Avoid a loop. This is the normal exit path for a
+ * system with only one x.25 iface and default route
+ */
+ if (rt->dev == from->dev) {
+ goto out_put_nb;
+ }
+
+ /* Remote end sending a call request on an already
+ * established LCI? It shouldnt happen, just in case..
+ */
+ read_lock_bh(&x25_forward_list_lock);
+ list_for_each(entry, &x25_forward_list) {
+ x25_frwd = list_entry(entry, struct x25_forward, node);
+ if (x25_frwd->lci == lci) {
+ printk(KERN_WARNING "X.25: call request for lci which is already registered!, transmitting but not registering new pair\n");
+ same_lci = 1;
+ }
+ }
+ read_unlock_bh(&x25_forward_list_lock);
+
+ /* Save the forwarding details for future traffic */
+ if (!same_lci){
+ if ((new_frwd = kmalloc(sizeof(struct x25_forward),
+ GFP_ATOMIC)) == NULL){
+ rc = -ENOMEM;
+ goto out_put_nb;
+ }
+ new_frwd->lci = lci;
+ new_frwd->dev1 = rt->dev;
+ new_frwd->dev2 = from->dev;
+ write_lock_bh(&x25_forward_list_lock);
+ list_add(&new_frwd->node, &x25_forward_list);
+ write_unlock_bh(&x25_forward_list_lock);
+ }
+
+ /* Forward the call request */
+ if ( (skbn = skb_clone(skb, GFP_ATOMIC)) == NULL){
+ goto out_put_nb;
+ }
+ x25_transmit_link(skbn, neigh_new);
+ rc = 1;
+ }
+
+
+out_put_nb:
+ x25_neigh_put(neigh_new);
+
+out_put_route:
+ x25_route_put(rt);
+ return rc;
+}
+
+
+int x25_forward_data(int lci, struct x25_neigh *from, struct sk_buff *skb) {
+
+ struct x25_forward *frwd;
+ struct list_head *entry;
+ struct net_device *peer = NULL;
+ struct x25_neigh *nb;
+ struct sk_buff *skbn;
+ int rc = 0;
+
+ read_lock_bh(&x25_forward_list_lock);
+ list_for_each(entry, &x25_forward_list) {
+ frwd = list_entry(entry, struct x25_forward, node);
+ if (frwd->lci == lci) {
+ /* The call is established, either side can send */
+ if (from->dev == frwd->dev1) {
+ peer = frwd->dev2;
+ } else {
+ peer = frwd->dev1;
+ }
+ break;
+ }
+ }
+ read_unlock_bh(&x25_forward_list_lock);
+
+ if ( (nb = x25_get_neigh(peer)) == NULL)
+ goto out;
+
+ if ( (skbn = pskb_copy(skb, GFP_ATOMIC)) == NULL){
+ goto out;
+
+ }
+ x25_transmit_link(skbn, nb);
+
+ x25_neigh_put(nb);
+ rc = 1;
+out:
+ return rc;
+}
+
+void x25_clear_forward_by_lci(unsigned int lci)
+{
+ struct x25_forward *fwd;
+ struct list_head *entry, *tmp;
+
+ write_lock_bh(&x25_forward_list_lock);
+
+ list_for_each_safe(entry, tmp, &x25_forward_list) {
+ fwd = list_entry(entry, struct x25_forward, node);
+ if (fwd->lci == lci) {
+ list_del(&fwd->node);
+ kfree(fwd);
+ }
+ }
+ write_unlock_bh(&x25_forward_list_lock);
+}
+
+
+void x25_clear_forward_by_dev(struct net_device *dev)
+{
+ struct x25_forward *fwd;
+ struct list_head *entry, *tmp;
+
+ write_lock_bh(&x25_forward_list_lock);
+
+ list_for_each_safe(entry, tmp, &x25_forward_list) {
+ fwd = list_entry(entry, struct x25_forward, node);
+ if ((fwd->dev1 == dev) || (fwd->dev2 == dev)){
+ list_del(&fwd->node);
+ kfree(fwd);
+ }
+ }
+ write_unlock_bh(&x25_forward_list_lock);
+}
diff --git a/net/x25/x25_proc.c b/net/x25/x25_proc.c
index a11837d361d2..e0470bd8c2f9 100644
--- a/net/x25/x25_proc.c
+++ b/net/x25/x25_proc.c
@@ -165,6 +165,75 @@ out:
return 0;
}
+static __inline__ struct x25_forward *x25_get_forward_idx(loff_t pos)
+{
+ struct x25_forward *f;
+ struct list_head *entry;
+
+ list_for_each(entry, &x25_forward_list) {
+ f = list_entry(entry, struct x25_forward, node);
+ if (!pos--)
+ goto found;
+ }
+
+ f = NULL;
+found:
+ return f;
+}
+
+static void *x25_seq_forward_start(struct seq_file *seq, loff_t *pos)
+{
+ loff_t l = *pos;
+
+ read_lock_bh(&x25_forward_list_lock);
+ return l ? x25_get_forward_idx(--l) : SEQ_START_TOKEN;
+}
+
+static void *x25_seq_forward_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct x25_forward *f;
+
+ ++*pos;
+ if (v == SEQ_START_TOKEN) {
+ f = NULL;
+ if (!list_empty(&x25_forward_list))
+ f = list_entry(x25_forward_list.next,
+ struct x25_forward, node);
+ goto out;
+ }
+ f = v;
+ if (f->node.next != &x25_forward_list)
+ f = list_entry(f->node.next, struct x25_forward, node);
+ else
+ f = NULL;
+out:
+ return f;
+
+}
+
+static void x25_seq_forward_stop(struct seq_file *seq, void *v)
+{
+ read_unlock_bh(&x25_forward_list_lock);
+}
+
+static int x25_seq_forward_show(struct seq_file *seq, void *v)
+{
+ struct x25_forward *f;
+
+ if (v == SEQ_START_TOKEN) {
+ seq_printf(seq, "lci dev1 dev2\n");
+ goto out;
+ }
+
+ f = v;
+
+ seq_printf(seq, "%d %-10s %-10s\n",
+ f->lci, f->dev1->name, f->dev2->name);
+
+out:
+ return 0;
+}
+
static struct seq_operations x25_seq_route_ops = {
.start = x25_seq_route_start,
.next = x25_seq_route_next,
@@ -179,6 +248,13 @@ static struct seq_operations x25_seq_socket_ops = {
.show = x25_seq_socket_show,
};
+static struct seq_operations x25_seq_forward_ops = {
+ .start = x25_seq_forward_start,
+ .next = x25_seq_forward_next,
+ .stop = x25_seq_forward_stop,
+ .show = x25_seq_forward_show,
+};
+
static int x25_seq_socket_open(struct inode *inode, struct file *file)
{
return seq_open(file, &x25_seq_socket_ops);
@@ -189,6 +265,11 @@ static int x25_seq_route_open(struct inode *inode, struct file *file)
return seq_open(file, &x25_seq_route_ops);
}
+static int x25_seq_forward_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &x25_seq_forward_ops);
+}
+
static struct file_operations x25_seq_socket_fops = {
.owner = THIS_MODULE,
.open = x25_seq_socket_open,
@@ -205,6 +286,14 @@ static struct file_operations x25_seq_route_fops = {
.release = seq_release,
};
+static struct file_operations x25_seq_forward_fops = {
+ .owner = THIS_MODULE,
+ .open = x25_seq_forward_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
static struct proc_dir_entry *x25_proc_dir;
int __init x25_proc_init(void)
@@ -225,9 +314,17 @@ int __init x25_proc_init(void)
if (!p)
goto out_socket;
p->proc_fops = &x25_seq_socket_fops;
+
+ p = create_proc_entry("forward", S_IRUGO, x25_proc_dir);
+ if (!p)
+ goto out_forward;
+ p->proc_fops = &x25_seq_forward_fops;
rc = 0;
+
out:
return rc;
+out_forward:
+ remove_proc_entry("socket", x25_proc_dir);
out_socket:
remove_proc_entry("route", x25_proc_dir);
out_route:
@@ -237,6 +334,7 @@ out_route:
void __exit x25_proc_exit(void)
{
+ remove_proc_entry("forward", x25_proc_dir);
remove_proc_entry("route", x25_proc_dir);
remove_proc_entry("socket", x25_proc_dir);
remove_proc_entry("x25", proc_net);
diff --git a/net/x25/x25_route.c b/net/x25/x25_route.c
index 2a3fe986b245..883a848bca5b 100644
--- a/net/x25/x25_route.c
+++ b/net/x25/x25_route.c
@@ -119,6 +119,9 @@ void x25_route_device_down(struct net_device *dev)
__x25_remove_route(rt);
}
write_unlock_bh(&x25_route_list_lock);
+
+ /* Remove any related forwarding */
+ x25_clear_forward_by_dev(dev);
}
/*
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