aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--include/linux/x25.h10
-rw-r--r--include/net/x25.h3
-rw-r--r--net/x25/af_x25.c73
-rw-r--r--net/x25/x25_subr.c18
4 files changed, 59 insertions, 45 deletions
diff --git a/include/linux/x25.h b/include/linux/x25.h
index 7531cfed5885..6f43b3d20248 100644
--- a/include/linux/x25.h
+++ b/include/linux/x25.h
@@ -4,6 +4,8 @@
* History
* mar/20/00 Daniela Squassoni Disabling/enabling of facilities
* negotiation.
+ * apr/02/05 Shaun Pereira Selective sub address matching with
+ * call user data
*/
#ifndef X25_KERNEL_H
@@ -16,6 +18,7 @@
#define SIOCX25GCALLUSERDATA (SIOCPROTOPRIVATE + 4)
#define SIOCX25SCALLUSERDATA (SIOCPROTOPRIVATE + 5)
#define SIOCX25GCAUSEDIAG (SIOCPROTOPRIVATE + 6)
+#define SIOCX25SCUDMATCHLEN (SIOCPROTOPRIVATE + 7)
/*
* Values for {get,set}sockopt.
@@ -109,4 +112,11 @@ struct x25_causediag {
unsigned char diagnostic;
};
+/*
+ * Further optional call user data match length selection
+ */
+struct x25_subaddr {
+ unsigned int cudmatchlength;
+};
+
#endif
diff --git a/include/net/x25.h b/include/net/x25.h
index 7a1ba5bbb868..9dd70dd4a9b7 100644
--- a/include/net/x25.h
+++ b/include/net/x25.h
@@ -134,7 +134,7 @@ struct x25_sock {
struct sock sk;
struct x25_address source_addr, dest_addr;
struct x25_neigh *neighbour;
- unsigned int lci;
+ unsigned int lci, cudmatchlength;
unsigned char state, condition, qbitincl, intflag;
unsigned short vs, vr, va, vl;
unsigned long t2, t21, t22, t23;
@@ -242,7 +242,6 @@ extern int x25_validate_nr(struct sock *, unsigned short);
extern void x25_write_internal(struct sock *, int);
extern int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, int *);
extern void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
-extern int x25_check_calluserdata(struct x25_calluserdata *,struct x25_calluserdata *);
/* x25_timer.c */
extern void x25_start_heartbeat(struct sock *);
diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index 2a24b243b841..e17d84a55d5e 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -29,6 +29,8 @@
* 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
* 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
* x25_proc.c, using seq_file
+ * 2005-04-02 Shaun Pereira Selective sub address matching
+ * with call user data
*/
#include <linux/config.h>
@@ -219,7 +221,8 @@ static void x25_insert_socket(struct sock *sk)
* Note: if a listening socket has cud set it must only get calls
* with matching cud.
*/
-static struct sock *x25_find_listener(struct x25_address *addr, struct x25_calluserdata *calluserdata)
+static struct sock *x25_find_listener(struct x25_address *addr,
+ struct sk_buff *skb)
{
struct sock *s;
struct sock *next_best;
@@ -230,22 +233,23 @@ static struct sock *x25_find_listener(struct x25_address *addr, struct x25_callu
sk_for_each(s, node, &x25_list)
if ((!strcmp(addr->x25_addr,
- x25_sk(s)->source_addr.x25_addr) ||
- !strcmp(addr->x25_addr,
- null_x25_address.x25_addr)) &&
- s->sk_state == TCP_LISTEN) {
-
+ x25_sk(s)->source_addr.x25_addr) ||
+ !strcmp(addr->x25_addr,
+ null_x25_address.x25_addr)) &&
+ s->sk_state == TCP_LISTEN) {
/*
* Found a listening socket, now check the incoming
* call user data vs this sockets call user data
*/
- if (x25_check_calluserdata(&x25_sk(s)->calluserdata, calluserdata)) {
- sock_hold(s);
- goto found;
- }
- if (x25_sk(s)->calluserdata.cudlength == 0) {
+ if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
+ if((memcmp(x25_sk(s)->calluserdata.cuddata,
+ skb->data,
+ x25_sk(s)->cudmatchlength)) == 0) {
+ sock_hold(s);
+ goto found;
+ }
+ } else
next_best = s;
- }
}
if (next_best) {
s = next_best;
@@ -497,6 +501,7 @@ static int x25_create(struct socket *sock, int protocol)
x25->t23 = sysctl_x25_clear_request_timeout;
x25->t2 = sysctl_x25_ack_holdback_timeout;
x25->state = X25_STATE_0;
+ x25->cudmatchlength = 0;
x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
@@ -545,6 +550,7 @@ static struct sock *x25_make_new(struct sock *osk)
x25->t2 = ox25->t2;
x25->facilities = ox25->facilities;
x25->qbitincl = ox25->qbitincl;
+ x25->cudmatchlength = ox25->cudmatchlength;
x25_init_timers(sk);
out:
@@ -822,7 +828,6 @@ 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_calluserdata calluserdata;
int len, rc;
/*
@@ -845,19 +850,10 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
skb_pull(skb,len);
/*
- * Incoming Call User Data.
- */
- if (skb->len >= 0) {
- memcpy(calluserdata.cuddata, skb->data, skb->len);
- calluserdata.cudlength = skb->len;
- }
-
- skb_push(skb,len);
-
- /*
* Find a listener for the particular address/cud pair.
*/
- sk = x25_find_listener(&source_addr,&calluserdata);
+ sk = x25_find_listener(&source_addr,skb);
+ skb_push(skb,len);
/*
* We can't accept the Call Request.
@@ -900,12 +896,22 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
makex25->neighbour = nb;
makex25->facilities = facilities;
makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
- makex25->calluserdata = calluserdata;
+ /* ensure no reverse facil on accept */
+ makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
+ makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
x25_write_internal(make, X25_CALL_ACCEPTED);
makex25->state = X25_STATE_3;
+ /*
+ * Incoming Call User Data.
+ */
+ if (skb->len >= 0) {
+ memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
+ makex25->calluserdata.cudlength = skb->len;
+ }
+
sk->sk_ack_backlog++;
x25_insert_socket(make);
@@ -1325,6 +1331,23 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
break;
}
+ case SIOCX25SCUDMATCHLEN: {
+ struct x25_subaddr sub_addr;
+ rc = -EINVAL;
+ if(sk->sk_state != TCP_CLOSE)
+ break;
+ rc = -EFAULT;
+ if (copy_from_user(&sub_addr, argp,
+ sizeof(sub_addr)))
+ break;
+ rc = -EINVAL;
+ if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
+ break;
+ x25->cudmatchlength = sub_addr.cudmatchlength;
+ rc = 0;
+ break;
+ }
+
default:
rc = dev_ioctl(cmd, argp);
break;
diff --git a/net/x25/x25_subr.c b/net/x25/x25_subr.c
index 183fea3bba67..c349bbd61684 100644
--- a/net/x25/x25_subr.c
+++ b/net/x25/x25_subr.c
@@ -354,21 +354,3 @@ void x25_check_rbuf(struct sock *sk)
}
}
-/*
- * Compare 2 calluserdata structures, used to find correct listening sockets
- * when call user data is used.
- */
-int x25_check_calluserdata(struct x25_calluserdata *ours, struct x25_calluserdata *theirs)
-{
- int i;
- if (ours->cudlength != theirs->cudlength)
- return 0;
-
- for (i=0;i<ours->cudlength;i++) {
- if (ours->cuddata[i] != theirs->cuddata[i]) {
- return 0;
- }
- }
- return 1;
-}
-
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.