[PATCH] X25: Add ITU-T facilites

From: Andrew Hendry
Date: Sun Oct 16 2005 - 20:45:11 EST

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Adds options for ITU DTE facilites to x.25, called address extension and
calling address extension.

Signed-off-by: Andrew Hendry <ahendry@xxxxxxxxxxx>

diff -uprN -X dontdiff linux-2.6.13.4-vanilla/include/linux/x25.h
linux-2.6.13.4/include/linux/x25.h
--- linux-2.6.13.4-vanilla/include/linux/x25.h 2005-09-17
11:02:12.000000000 +1000
+++ linux-2.6.13.4/include/linux/x25.h 2005-09-26 13:44:39.000000000
+1000
@@ -21,6 +21,8 @@
#define SIOCX25SCUDMATCHLEN (SIOCPROTOPRIVATE + 7)
#define SIOCX25CALLACCPTAPPRV (SIOCPROTOPRIVATE + 8)
#define SIOCX25SENDCALLACCPT (SIOCPROTOPRIVATE + 9)
+#define SIOCX25GDTEFACILITIES (SIOCPROTOPRIVATE + 10)
+#define SIOCX25SDTEFACILITIES (SIOCPROTOPRIVATE + 11)

/*
* Values for {get,set}sockopt.
@@ -77,6 +79,8 @@ struct x25_subscrip_struct {
#define X25_MASK_PACKET_SIZE 0x04
#define X25_MASK_WINDOW_SIZE 0x08

+#define X25_MASK_CALLING_AE 0x10
+#define X25_MASK_CALLED_AE 0x20

/*
@@ -98,6 +102,24 @@ struct x25_facilities {
unsigned int reverse;
};

+/*
+* ITU DTE facilities
+* Only the called and calling address
+* extension are currently implemented.
+* The rest are in place to avoid the struct
+* changing size if someone needs them later
++ */
+struct x25_dte_facilities {
+ unsigned int calling_len, called_len;
+ char calling_ae[20];
+ char called_ae[20];
+ unsigned char min_throughput;
+ unsigned short delay_cumul;
+ unsigned short delay_target;
+ unsigned short delay_max;
+ unsigned char expedited;
+};
+
/*
* Call User Data structure.
*/
diff -uprN -X dontdiff linux-2.6.13.4-vanilla/include/net/x25.h
linux-2.6.13.4/include/net/x25.h
--- linux-2.6.13.4-vanilla/include/net/x25.h 2005-09-17
11:02:12.000000000 +1000
+++ linux-2.6.13.4/include/net/x25.h 2005-09-26 13:44:39.000000000 +1000
@@ -101,9 +101,19 @@ enum {
#define X25_FAC_PACKET_SIZE 0x42
#define X25_FAC_WINDOW_SIZE 0x43

-#define X25_MAX_FAC_LEN 20 /* Plenty to spare */
+#define X25_MAX_FAC_LEN 60
#define X25_MAX_CUD_LEN 128

+#define X25_FAC_CALLING_AE 0xCB
+#define X25_FAC_CALLED_AE 0xC9
+
+#define X25_MAX_FAC_LEN 60
+
+#define X25_MARKER 0x00
+#define X25_DTE_SERVICES 0x0F
+#define X25_MAX_AE_LEN 32
+
+
/**
* struct x25_route - x25 routing entry
* @node - entry in x25_list_lock
@@ -148,6 +158,7 @@ struct x25_sock {
struct timer_list timer;
struct x25_causediag causediag;
struct x25_facilities facilities;
+ struct x25_dte_facilities dte_facilities;
struct x25_calluserdata calluserdata;
unsigned long vc_facil_mask; /* inc_call facilities mask */
};
@@ -180,9 +191,9 @@ extern void x25_establish_link(struct x2
extern void x25_terminate_link(struct x25_neigh *);

/* x25_facilities.c */
-extern int x25_parse_facilities(struct sk_buff *, struct
x25_facilities *, unsigned long *);
-extern int x25_create_facilities(unsigned char *, struct
x25_facilities *, unsigned long);
-extern int x25_negotiate_facilities(struct sk_buff *, struct sock *,
struct x25_facilities *);
+extern int x25_parse_facilities(struct sk_buff *, struct
x25_facilities *, struct x25_dte_facilities *, unsigned long *);
+extern int x25_create_facilities(unsigned char *, struct
x25_facilities *, struct x25_dte_facilities *, unsigned long);
+extern int x25_negotiate_facilities(struct sk_buff *, struct sock *,
struct x25_facilities *, struct x25_dte_facilities *);
extern void x25_limit_facilities(struct x25_facilities *, struct
x25_neigh *);

/* x25_in.c */
diff -uprN -X dontdiff linux-2.6.13.4-vanilla/net/x25/af_x25.c
linux-2.6.13.4/net/x25/af_x25.c
--- linux-2.6.13.4-vanilla/net/x25/af_x25.c 2005-09-17
11:02:12.000000000 +1000
+++ linux-2.6.13.4/net/x25/af_x25.c 2005-09-26 13:52:55.000000000 +1000
@@ -513,6 +513,11 @@ static int x25_create(struct socket *soc
x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
x25->facilities.throughput = X25_DEFAULT_THROUGHPUT;
x25->facilities.reverse = X25_DEFAULT_REVERSE;
+ x25->dte_facilities.calling_len = 0;
+ x25->dte_facilities.called_len = 0;
+ memset(x25->dte_facilities.called_ae,'\0',X25_MAX_AE_LEN);
+ memset(x25->dte_facilities.calling_ae,'\0',X25_MAX_AE_LEN);
+
rc = 0;
out:
return rc;
@@ -554,6 +559,7 @@ static struct sock *x25_make_new(struct
x25->t2 = ox25->t2;
x25->facilities = ox25->facilities;
x25->qbitincl = ox25->qbitincl;
+ x25->dte_facilities = ox25->dte_facilities;
x25->cudmatchlength = ox25->cudmatchlength;
x25->accptapprv = ox25->accptapprv;

@@ -833,6 +839,7 @@ int x25_rx_call_request(struct sk_buff *
struct x25_sock *makex25;
struct x25_address source_addr, dest_addr;
struct x25_facilities facilities;
+ struct x25_dte_facilities dte_facilities;
int len, rc;

/*
@@ -869,7 +876,8 @@ int x25_rx_call_request(struct sk_buff *
/*
* Try to reach a compromise on the requested facilities.
*/
- if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1)
+ if ((len = x25_negotiate_facilities(skb, sk, &facilities,
+ &dte_facilities)) == -1)
goto out_sock_put;

/*
@@ -900,9 +908,12 @@ int x25_rx_call_request(struct sk_buff *
makex25->source_addr = source_addr;
makex25->neighbour = nb;
makex25->facilities = facilities;
+ makex25->dte_facilities= dte_facilities;
makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
/* ensure no reverse facil on accept */
makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
+ /* ensure no calling address extension on accept */
+ makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;

/* Normally all calls are accepted immediatly */
@@ -1309,6 +1320,35 @@ static int x25_ioctl(struct socket *sock
break;
}

+ case SIOCX25GDTEFACILITIES: {
+ struct x25_dte_facilities dtefacs = x25->dte_facilities;
+ rc = copy_to_user(argp, &dtefacs,
+ sizeof(dtefacs)) ? -EFAULT :0;
+ break;
+ }
+
+ case SIOCX25SDTEFACILITIES: {
+ struct x25_dte_facilities dtefacs;
+ rc = -EFAULT;
+ if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
+ break;
+ rc = -EINVAL;
+ if (sk->sk_state != TCP_LISTEN &&
+ sk->sk_state != TCP_CLOSE)
+ break;
+ if (dtefacs.calling_len > X25_MAX_AE_LEN)
+ break;
+ if (dtefacs.calling_ae == NULL)
+ break;
+ if (dtefacs.called_len > X25_MAX_AE_LEN)
+ break;
+ if (dtefacs.called_ae == NULL)
+ break;
+ x25->dte_facilities = dtefacs;
+ rc = 0;
+ break;
+ }
+
case SIOCX25GCALLUSERDATA: {
struct x25_calluserdata cud = x25->calluserdata;
rc = copy_to_user(argp, &cud,
diff -uprN -X dontdiff linux-2.6.13.4-vanilla/net/x25/x25_facilities.c
linux-2.6.13.4/net/x25/x25_facilities.c
--- linux-2.6.13.4-vanilla/net/x25/x25_facilities.c 2005-09-17
11:02:12.000000000 +1000
+++ linux-2.6.13.4/net/x25/x25_facilities.c 2005-09-26
13:44:39.000000000 +1000
@@ -28,11 +28,12 @@
#include <net/x25.h>

/*
- * Parse a set of facilities into the facilities structure.
Unrecognised
+ * Parse a set of facilities into the facilities structures.
Unrecognised
* facilities are written to the debug log file.
*/
int x25_parse_facilities(struct sk_buff *skb,
struct x25_facilities *facilities,
+ struct x25_dte_facilities *dte_facs,
unsigned long *vc_fac_mask)
{
unsigned char *p = skb->data;
@@ -40,6 +41,16 @@ int x25_parse_facilities(struct sk_buff

*vc_fac_mask = 0;

+ /* The kernel knows which facilities were set on an incoming call
+ * but currently its not available to userspace.
+ * Here we give userspace who read incoming call facilities
+ * 0 length to indicate it wasn't set.
+ */
+ dte_facs->calling_len = 0;
+ dte_facs->called_len = 0;
+ memset(dte_facs->called_ae,'\0',X25_MAX_AE_LEN);
+ memset(dte_facs->calling_ae,'\0',X25_MAX_AE_LEN);
+
while (len > 0) {
switch (*p & X25_FAC_CLASS_MASK) {
case X25_FAC_CLASS_A:
@@ -74,6 +85,8 @@ int x25_parse_facilities(struct sk_buff
facilities->throughput = p[1];
*vc_fac_mask |= X25_MASK_THROUGHPUT;
break;
+ case X25_MARKER:
+ break;
default:
printk(KERN_DEBUG "X.25: unknown facility "
"%02X, value %02X\n",
@@ -112,9 +125,28 @@ int x25_parse_facilities(struct sk_buff
len -= 4;
break;
case X25_FAC_CLASS_D:
- printk(KERN_DEBUG "X.25: unknown facility %02X, "
- "length %d, values %02X, %02X, %02X, %02X\n",
- p[0], p[1], p[2], p[3], p[4], p[5]);
+ switch (*p) {
+ case X25_FAC_CALLING_AE:
+ if (p[1] > 33)
+ break;
+ dte_facs->calling_len = p[2];
+ memcpy(dte_facs->calling_ae,&p[3],p[1]-1);
+ *vc_fac_mask |= X25_MASK_CALLING_AE;
+ break;
+ case X25_FAC_CALLED_AE:
+ if (p[1] > 33)
+ break;
+ dte_facs->called_len = p[2];
+ memcpy(dte_facs->called_ae,&p[3],p[1]-1);
+ *vc_fac_mask |= X25_MASK_CALLED_AE;
+ break;
+ default:
+ printk(KERN_DEBUG "X.25: unknown facility %02X,"
+ "length %d, values %02X, %02X, %02X, %02X\n",
+ p[0], p[1], p[2], p[3], p[4], p[5]);
+ break;
+ }
+
len -= p[1] + 2;
p += p[1] + 2;
break;
@@ -129,6 +161,7 @@ int x25_parse_facilities(struct sk_buff
*/
int x25_create_facilities(unsigned char *buffer,
struct x25_facilities *facilities,
+ struct x25_dte_facilities *dte_facs,
unsigned long facil_mask)
{
unsigned char *p = buffer + 1;
@@ -168,6 +201,32 @@ int x25_create_facilities(unsigned char
*p++ = facilities->winsize_out ? : facilities->winsize_in;
}

+ if ((facil_mask & X25_MASK_CALLING_AE) ||
+ (facil_mask & X25_MASK_CALLED_AE)) {
+ *p++ = X25_MARKER;
+ *p++ = X25_DTE_SERVICES;
+ }
+
+ if (dte_facs->calling_len && (facil_mask & X25_MASK_CALLING_AE)) {
+ unsigned bytecount = (dte_facs->calling_len % 2) ?
+ dte_facs->calling_len/2+1 :
dte_facs->calling_len/2;
+ *p++ = X25_FAC_CALLING_AE;
+ *p++ = 1 + bytecount;
+ *p++ = dte_facs->calling_len;
+ memcpy(p,dte_facs->calling_ae,bytecount);
+ p+=bytecount;
+ }
+
+ if (dte_facs->called_len && (facil_mask & X25_MASK_CALLED_AE)) {
+ unsigned bytecount = (dte_facs->called_len % 2) ?
+ dte_facs->called_len/2+1 :
dte_facs->called_len/2;
+ *p++ = X25_FAC_CALLED_AE;
+ *p++ = 1 + bytecount;
+ *p++ = dte_facs->called_len;
+ memcpy(p,dte_facs->called_ae,bytecount);
+ p+=bytecount;
+ }
+
len = p - buffer;
buffer[0] = len - 1;

@@ -180,7 +239,8 @@ int x25_create_facilities(unsigned char
* The only real problem is with reverse charging.
*/
int x25_negotiate_facilities(struct sk_buff *skb, struct sock *sk,
- struct x25_facilities *new)
+ struct x25_facilities *new,
+ struct x25_dte_facilities *dte)
{
struct x25_sock *x25 = x25_sk(sk);
struct x25_facilities *ours = &x25->facilities;
@@ -190,7 +250,7 @@ int x25_negotiate_facilities(struct sk_b
memset(&theirs, 0, sizeof(theirs));
memcpy(new, ours, sizeof(*new));

- len = x25_parse_facilities(skb, &theirs, &x25->vc_facil_mask);
+ len = x25_parse_facilities(skb, &theirs, dte, &x25->vc_facil_mask);

/*
* They want reverse charging, we won't accept it.
diff -uprN -X dontdiff linux-2.6.13.4-vanilla/net/x25/x25_in.c
linux-2.6.13.4/net/x25/x25_in.c
--- linux-2.6.13.4-vanilla/net/x25/x25_in.c 2005-09-17
11:02:12.000000000 +1000
+++ linux-2.6.13.4/net/x25/x25_in.c 2005-09-26 13:44:39.000000000 +1000
@@ -106,6 +106,7 @@ static int x25_state1_machine(struct soc
skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
skb_pull(skb,
x25_parse_facilities(skb, &x25->facilities,
+ &x25->dte_facilities,
&x25->vc_facil_mask));
/*
* Copy any Call User Data.
diff -uprN -X dontdiff linux-2.6.13.4-vanilla/net/x25/x25_subr.c
linux-2.6.13.4/net/x25/x25_subr.c
--- linux-2.6.13.4-vanilla/net/x25/x25_subr.c 2005-09-17
11:02:12.000000000 +1000
+++ linux-2.6.13.4/net/x25/x25_subr.c 2005-09-26 13:44:39.000000000
+1000
@@ -191,6 +191,7 @@ void x25_write_internal(struct sock *sk,
memcpy(dptr, addresses, len);
len = x25_create_facilities(facilities,
&x25->facilities,
+ &x25->dte_facilities,
x25->neighbour->global_facil_mask);
dptr = skb_put(skb, len);
memcpy(dptr, facilities, len);
@@ -206,6 +207,7 @@ void x25_write_internal(struct sock *sk,
*dptr++ = 0x00; /* Address lengths */
len = x25_create_facilities(facilities,
&x25->facilities,
+ &x25->dte_facilities,
x25->vc_facil_mask);
dptr = skb_put(skb, len);
memcpy(dptr, facilities, len);

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