Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *	X.25 Packet Layer release 002
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *	This is ALPHA test software. This code may break your machine,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *	randomly fail to work with new releases, misbehave and/or generally
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *	screw up. It might even work.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *	This code REQUIRES 2.1.15 or higher
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *	History
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *	X.25 001	Jonathan Naylor	  Started coding.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  *	X.25 002	Jonathan Naylor	  New timer architecture.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *	mar/20/00	Daniela Squassoni Disabling/enabling of facilities
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  *					  negotiation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *	2000-09-04	Henner Eisen	  dev_hold() / dev_put() for x25_neigh.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define pr_fmt(fmt) "X25: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <net/x25.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) LIST_HEAD(x25_neigh_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) DEFINE_RWLOCK(x25_neigh_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static void x25_t20timer_expiry(struct timer_list *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static void x25_transmit_restart_confirmation(struct x25_neigh *nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) static void x25_transmit_restart_request(struct x25_neigh *nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  *	Linux set/reset timer routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) static inline void x25_start_t20timer(struct x25_neigh *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	mod_timer(&nb->t20timer, jiffies + nb->t20);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) static void x25_t20timer_expiry(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	struct x25_neigh *nb = from_timer(nb, t, t20timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	x25_transmit_restart_request(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	x25_start_t20timer(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) static inline void x25_stop_t20timer(struct x25_neigh *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	del_timer(&nb->t20timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static inline int x25_t20timer_pending(struct x25_neigh *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	return timer_pending(&nb->t20timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67)  *	This handles all restart and diagnostic frames.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) void x25_link_control(struct sk_buff *skb, struct x25_neigh *nb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		      unsigned short frametype)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct sk_buff *skbn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	int confirm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	switch (frametype) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	case X25_RESTART_REQUEST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		confirm = !x25_t20timer_pending(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		x25_stop_t20timer(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		nb->state = X25_LINK_STATE_3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		if (confirm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 			x25_transmit_restart_confirmation(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	case X25_RESTART_CONFIRMATION:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		x25_stop_t20timer(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		nb->state = X25_LINK_STATE_3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	case X25_DIAGNOSTIC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		if (!pskb_may_pull(skb, X25_STD_MIN_LEN + 4))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		pr_warn("diagnostic #%d - %02X %02X %02X\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		       skb->data[3], skb->data[4],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		       skb->data[5], skb->data[6]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		pr_warn("received unknown %02X with LCI 000\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		       frametype);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	if (nb->state == X25_LINK_STATE_3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		while ((skbn = skb_dequeue(&nb->queue)) != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			x25_send_frame(skbn, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)  *	This routine is called when a Restart Request is needed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static void x25_transmit_restart_request(struct x25_neigh *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	unsigned char *dptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	skb_reserve(skb, X25_MAX_L2_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	dptr = skb_put(skb, X25_STD_MIN_LEN + 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	*dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	*dptr++ = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	*dptr++ = X25_RESTART_REQUEST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	*dptr++ = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	*dptr++ = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	skb->sk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	x25_send_frame(skb, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  * This routine is called when a Restart Confirmation is needed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static void x25_transmit_restart_confirmation(struct x25_neigh *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	unsigned char *dptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	skb_reserve(skb, X25_MAX_L2_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	dptr = skb_put(skb, X25_STD_MIN_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	*dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	*dptr++ = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	*dptr++ = X25_RESTART_CONFIRMATION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	skb->sk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	x25_send_frame(skb, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)  *	This routine is called when a Clear Request is needed outside of the context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)  *	of a connected socket.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) void x25_transmit_clear_request(struct x25_neigh *nb, unsigned int lci,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 				unsigned char cause)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	unsigned char *dptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	skb_reserve(skb, X25_MAX_L2_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	dptr = skb_put(skb, X25_STD_MIN_LEN + 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	*dptr++ = ((lci >> 8) & 0x0F) | (nb->extended ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 					 X25_GFI_EXTSEQ :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 					 X25_GFI_STDSEQ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	*dptr++ = (lci >> 0) & 0xFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	*dptr++ = X25_CLEAR_REQUEST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	*dptr++ = cause;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	*dptr++ = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	skb->sk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	x25_send_frame(skb, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) void x25_transmit_link(struct sk_buff *skb, struct x25_neigh *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	switch (nb->state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	case X25_LINK_STATE_0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		skb_queue_tail(&nb->queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		nb->state = X25_LINK_STATE_1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		x25_establish_link(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	case X25_LINK_STATE_1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	case X25_LINK_STATE_2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		skb_queue_tail(&nb->queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	case X25_LINK_STATE_3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		x25_send_frame(skb, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)  *	Called when the link layer has become established.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) void x25_link_established(struct x25_neigh *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	switch (nb->state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	case X25_LINK_STATE_0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		nb->state = X25_LINK_STATE_2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	case X25_LINK_STATE_1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		x25_transmit_restart_request(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		nb->state = X25_LINK_STATE_2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		x25_start_t20timer(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)  *	Called when the link layer has terminated, or an establishment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)  *	request has failed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) void x25_link_terminated(struct x25_neigh *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	nb->state = X25_LINK_STATE_0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	/* Out of order: clear existing virtual calls (X.25 03/93 4.6.3) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	x25_kill_by_neigh(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)  *	Add a new device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) void x25_link_device_up(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	struct x25_neigh *nb = kmalloc(sizeof(*nb), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (!nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	skb_queue_head_init(&nb->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	timer_setup(&nb->t20timer, x25_t20timer_expiry, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	dev_hold(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	nb->dev      = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	nb->state    = X25_LINK_STATE_0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	nb->extended = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	 * Enables negotiation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	nb->global_facil_mask = X25_MASK_REVERSE |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 				       X25_MASK_THROUGHPUT |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 				       X25_MASK_PACKET_SIZE |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 				       X25_MASK_WINDOW_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	nb->t20      = sysctl_x25_restart_request_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	refcount_set(&nb->refcnt, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	write_lock_bh(&x25_neigh_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	list_add(&nb->node, &x25_neigh_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	write_unlock_bh(&x25_neigh_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)  *	__x25_remove_neigh - remove neighbour from x25_neigh_list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)  *	@nb: - neigh to remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)  *	Remove neighbour from x25_neigh_list. If it was there.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)  *	Caller must hold x25_neigh_list_lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static void __x25_remove_neigh(struct x25_neigh *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	skb_queue_purge(&nb->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	x25_stop_t20timer(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	if (nb->node.next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		list_del(&nb->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		x25_neigh_put(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)  *	A device has been removed, remove its links.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) void x25_link_device_down(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	struct x25_neigh *nb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	struct list_head *entry, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	write_lock_bh(&x25_neigh_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	list_for_each_safe(entry, tmp, &x25_neigh_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		nb = list_entry(entry, struct x25_neigh, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		if (nb->dev == dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			__x25_remove_neigh(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 			dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	write_unlock_bh(&x25_neigh_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)  *	Given a device, return the neighbour address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) struct x25_neigh *x25_get_neigh(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	struct x25_neigh *nb, *use = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	struct list_head *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	read_lock_bh(&x25_neigh_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	list_for_each(entry, &x25_neigh_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		nb = list_entry(entry, struct x25_neigh, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		if (nb->dev == dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 			use = nb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	if (use)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		x25_neigh_hold(use);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	read_unlock_bh(&x25_neigh_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	return use;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)  *	Handle the ioctls that control the subscription functions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) int x25_subscr_ioctl(unsigned int cmd, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	struct x25_subscrip_struct x25_subscr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	struct x25_neigh *nb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	int rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	if (cmd != SIOCX25GSUBSCRIP && cmd != SIOCX25SSUBSCRIP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	rc = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	if (copy_from_user(&x25_subscr, arg, sizeof(x25_subscr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	if ((dev = x25_dev_get(x25_subscr.device)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	if ((nb = x25_get_neigh(dev)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		goto out_dev_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	if (cmd == SIOCX25GSUBSCRIP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		read_lock_bh(&x25_neigh_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		x25_subscr.extended	     = nb->extended;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		x25_subscr.global_facil_mask = nb->global_facil_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		read_unlock_bh(&x25_neigh_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		rc = copy_to_user(arg, &x25_subscr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 				  sizeof(x25_subscr)) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		if (!(x25_subscr.extended && x25_subscr.extended != 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 			rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 			write_lock_bh(&x25_neigh_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 			nb->extended	     = x25_subscr.extended;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 			nb->global_facil_mask = x25_subscr.global_facil_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 			write_unlock_bh(&x25_neigh_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	x25_neigh_put(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) out_dev_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)  *	Release all memory associated with X.25 neighbour structures.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) void __exit x25_link_free(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	struct x25_neigh *nb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	struct list_head *entry, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	write_lock_bh(&x25_neigh_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	list_for_each_safe(entry, tmp, &x25_neigh_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 		struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 		nb = list_entry(entry, struct x25_neigh, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 		dev = nb->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 		__x25_remove_neigh(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 		dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	write_unlock_bh(&x25_neigh_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) }