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-rw-r--r--include/linux/x25.h26
-rw-r--r--include/net/x25.h21
-rw-r--r--net/x25/af_x25.c45
-rw-r--r--net/x25/x25_facilities.c82
-rw-r--r--net/x25/x25_in.c3
-rw-r--r--net/x25/x25_subr.c6
6 files changed, 163 insertions, 20 deletions
diff --git a/include/linux/x25.h b/include/linux/x25.h
index 16d44931afa0..d035e4e87d07 100644
--- a/include/linux/x25.h
+++ b/include/linux/x25.h
@@ -11,6 +11,8 @@
#ifndef X25_KERNEL_H
#define X25_KERNEL_H
+#include <linux/types.h>
+
#define SIOCX25GSUBSCRIP (SIOCPROTOPRIVATE + 0)
#define SIOCX25SSUBSCRIP (SIOCPROTOPRIVATE + 1)
#define SIOCX25GFACILITIES (SIOCPROTOPRIVATE + 2)
@@ -21,6 +23,8 @@
#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 +81,8 @@ 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
/*
@@ -99,6 +105,26 @@ struct x25_facilities {
};
/*
+* 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 {
+ __u16 delay_cumul;
+ __u16 delay_target;
+ __u16 delay_max;
+ __u8 min_throughput;
+ __u8 expedited;
+ __u8 calling_len;
+ __u8 called_len;
+ __u8 calling_ae[20];
+ __u8 called_ae[20];
+};
+
+/*
* Call User Data structure.
*/
struct x25_calluserdata {
diff --git a/include/net/x25.h b/include/net/x25.h
index fee62ff8c194..0ad90ebcf86e 100644
--- a/include/net/x25.h
+++ b/include/net/x25.h
@@ -101,9 +101,17 @@ 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_MARKER 0x00
+#define X25_DTE_SERVICES 0x0F
+#define X25_MAX_AE_LEN 40 /* Max num of semi-octets in AE - OSI Nw */
+#define X25_MAX_DTE_FACIL_LEN 21 /* Max length of DTE facility params */
+
/**
* struct x25_route - x25 routing entry
* @node - entry in x25_list_lock
@@ -148,6 +156,7 @@ 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 +189,13 @@ extern void x25_establish_link(struct x25_neigh *);
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 --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index 03725c051752..7bf93df7248b 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -525,6 +525,13 @@ static int x25_create(struct socket *sock, int protocol)
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',
+ sizeof(x25->dte_facilities.called_ae));
+ memset(x25->dte_facilities.calling_ae, '\0',
+ sizeof(x25->dte_facilities.calling_ae));
+
rc = 0;
out:
return rc;
@@ -561,6 +568,7 @@ static struct sock *x25_make_new(struct sock *osk)
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;
@@ -840,6 +848,7 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
struct x25_sock *makex25;
struct x25_address source_addr, dest_addr;
struct x25_facilities facilities;
+ struct x25_dte_facilities dte_facilities;
int len, rc;
/*
@@ -876,7 +885,8 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
/*
* Try to reach a compromise on the requested facilities.
*/
- if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1)
+ len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
+ if (len == -1)
goto out_sock_put;
/*
@@ -907,9 +917,12 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
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 */
@@ -1316,6 +1329,36 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
break;
}
+ case SIOCX25GDTEFACILITIES: {
+ rc = copy_to_user(argp, &x25->dte_facilities,
+ sizeof(x25->dte_facilities));
+ if (rc)
+ rc = -EFAULT;
+ 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 --git a/net/x25/x25_facilities.c b/net/x25/x25_facilities.c
index 54278b962f4c..9f42b9c9de37 100644
--- a/net/x25/x25_facilities.c
+++ b/net/x25/x25_facilities.c
@@ -28,18 +28,28 @@
#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,
- unsigned long *vc_fac_mask)
+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;
unsigned int len = *p++;
*vc_fac_mask = 0;
+ /*
+ * The kernel knows which facilities were set on an incoming call but
+ * currently this information is 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', sizeof(dte_facs->called_ae));
+ memset(dte_facs->calling_ae, '\0', sizeof(dte_facs->calling_ae));
+
while (len > 0) {
switch (*p & X25_FAC_CLASS_MASK) {
case X25_FAC_CLASS_A:
@@ -74,6 +84,8 @@ int x25_parse_facilities(struct sk_buff *skb,
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",
@@ -112,11 +124,30 @@ int x25_parse_facilities(struct sk_buff *skb,
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] > X25_MAX_DTE_FACIL_LEN)
+ 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] > X25_MAX_DTE_FACIL_LEN)
+ 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;
+ p += p[1] + 2;
break;
}
}
@@ -128,8 +159,8 @@ int x25_parse_facilities(struct sk_buff *skb,
* Create a set of facilities.
*/
int x25_create_facilities(unsigned char *buffer,
- struct x25_facilities *facilities,
- unsigned long facil_mask)
+ struct x25_facilities *facilities,
+ struct x25_dte_facilities *dte_facs, unsigned long facil_mask)
{
unsigned char *p = buffer + 1;
int len;
@@ -168,6 +199,33 @@ int x25_create_facilities(unsigned char *buffer,
*p++ = facilities->winsize_out ? : facilities->winsize_in;
}
+ if (facil_mask & (X25_MASK_CALLING_AE|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 +238,7 @@ int x25_create_facilities(unsigned char *buffer,
* 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 +248,7 @@ int x25_negotiate_facilities(struct sk_buff *skb, struct sock *sk,
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 --git a/net/x25/x25_in.c b/net/x25/x25_in.c
index 26146874b839..eed50e10f09b 100644
--- a/net/x25/x25_in.c
+++ b/net/x25/x25_in.c
@@ -106,7 +106,8 @@ static int x25_state1_machine(struct sock *sk, struct sk_buff *skb, int frametyp
skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
skb_pull(skb,
x25_parse_facilities(skb, &x25->facilities,
- &x25->vc_facil_mask));
+ &x25->dte_facilities,
+ &x25->vc_facil_mask));
/*
* Copy any Call User Data.
*/
diff --git a/net/x25/x25_subr.c b/net/x25/x25_subr.c
index 8be9b8fbc24d..8d6220aa5d0f 100644
--- a/net/x25/x25_subr.c
+++ b/net/x25/x25_subr.c
@@ -190,8 +190,9 @@ void x25_write_internal(struct sock *sk, int frametype)
dptr = skb_put(skb, len);
memcpy(dptr, addresses, len);
len = x25_create_facilities(facilities,
- &x25->facilities,
- x25->neighbour->global_facil_mask);
+ &x25->facilities,
+ &x25->dte_facilities,
+ x25->neighbour->global_facil_mask);
dptr = skb_put(skb, len);
memcpy(dptr, facilities, len);
dptr = skb_put(skb, x25->calluserdata.cudlength);
@@ -206,6 +207,7 @@ void x25_write_internal(struct sock *sk, int frametype)
*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);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.