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)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sockios.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <net/ax25.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/if_arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/termios.h>	/* For TIOCINQ/OUTQ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <linux/sysctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <net/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <net/arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  *	IP over AX.25 encapsulation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  */
^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)  *	Shove an AX.25 UI header on an IP packet and handle ARP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #ifdef CONFIG_INET
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static int ax25_hard_header(struct sk_buff *skb, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 			    unsigned short type, const void *daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 			    const void *saddr, unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	unsigned char *buff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	/* they sometimes come back to us... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	if (type == ETH_P_AX25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	/* header is an AX.25 UI frame from us to them */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	buff = skb_push(skb, AX25_HEADER_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	*buff++ = 0x00;	/* KISS DATA */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	if (daddr != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		memcpy(buff, daddr, dev->addr_len);	/* Address specified */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	buff[6] &= ~AX25_CBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	buff[6] &= ~AX25_EBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	buff[6] |= AX25_SSSID_SPARE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	buff    += AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (saddr != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		memcpy(buff, saddr, dev->addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		memcpy(buff, dev->dev_addr, dev->addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	buff[6] &= ~AX25_CBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	buff[6] |= AX25_EBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	buff[6] |= AX25_SSSID_SPARE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	buff    += AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	*buff++  = AX25_UI;	/* UI */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	/* Append a suitable AX.25 PID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	switch (type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	case ETH_P_IP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		*buff++ = AX25_P_IP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	case ETH_P_ARP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		*buff++ = AX25_P_ARP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		printk(KERN_ERR "AX.25: ax25_hard_header - wrong protocol type 0x%2.2x\n", type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		*buff++ = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	if (daddr != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		return AX25_HEADER_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	return -AX25_HEADER_LEN;	/* Unfinished header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) netdev_tx_t ax25_ip_xmit(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	struct sk_buff *ourskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	unsigned char *bp  = skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	ax25_route *route;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	struct net_device *dev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	ax25_address *src, *dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	ax25_digi *digipeat = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	ax25_dev *ax25_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	ax25_cb *ax25;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	char ip_mode = ' ';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	dst = (ax25_address *)(bp + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	src = (ax25_address *)(bp + 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	ax25_route_lock_use();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	route = ax25_get_route(dst, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (route) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		digipeat = route->digipeat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		dev = route->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		ip_mode = route->ip_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (dev == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		dev = skb->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		goto put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	if (bp[16] == AX25_P_IP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		if (ip_mode == 'V' || (ip_mode == ' ' && ax25_dev->values[AX25_VALUES_IPDEFMODE])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			 *	We copy the buffer and release the original thereby
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 			 *	keeping it straight
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 			 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			 *	Note: we report 1 back so the caller will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			 *	not feed the frame direct to the physical device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 			 *	We don't want that to happen. (It won't be upset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			 *	as we have pulled the frame from the queue by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			 *	freeing it).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			 *	NB: TCP modifies buffers that are still
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			 *	on a device queue, thus we use skb_copy()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			 *      instead of using skb_clone() unless this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			 *	gets fixed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			ax25_address src_c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 			ax25_address dst_c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 			if ((ourskb = skb_copy(skb, GFP_ATOMIC)) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 				kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 				goto put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			if (skb->sk != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 				skb_set_owner_w(ourskb, skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			/* dl9sau: bugfix
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 			 * after kfree_skb(), dst and src which were pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			 * to bp which is part of skb->data would not be valid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			 * anymore hope that after skb_pull(ourskb, ..) our
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			 * dsc_c and src_c will not become invalid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			bp  = ourskb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			dst_c = *(ax25_address *)(bp + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 			src_c = *(ax25_address *)(bp + 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			skb_pull(ourskb, AX25_HEADER_LEN - 1);	/* Keep PID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			skb_reset_network_header(ourskb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			ax25=ax25_send_frame(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 			    ourskb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			    ax25_dev->values[AX25_VALUES_PACLEN],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			    &src_c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 			    &dst_c, digipeat, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			if (ax25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 				ax25_cb_put(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 			goto put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	bp[7]  &= ~AX25_CBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	bp[7]  &= ~AX25_EBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	bp[7]  |= AX25_SSSID_SPARE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	bp[14] &= ~AX25_CBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	bp[14] |= AX25_EBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	bp[14] |= AX25_SSSID_SPARE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	skb_pull(skb, AX25_KISS_HEADER_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	if (digipeat != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		if ((ourskb = ax25_rt_build_path(skb, src, dst, route->digipeat)) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 			kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			goto put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		skb = ourskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	ax25_queue_xmit(skb, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	ax25_route_lock_unuse();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	return NETDEV_TX_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) #else	/* INET */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) static int ax25_hard_header(struct sk_buff *skb, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 			    unsigned short type, const void *daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 			    const void *saddr, unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	return -AX25_HEADER_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) netdev_tx_t ax25_ip_xmit(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	return NETDEV_TX_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) static bool ax25_validate_header(const char *header, unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	ax25_digi digi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	if (!len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	if (header[0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	return ax25_addr_parse(header + 1, len - 1, NULL, NULL, &digi, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 			       NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) const struct header_ops ax25_header_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	.create = ax25_hard_header,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	.validate = ax25_validate_header,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) EXPORT_SYMBOL(ax25_header_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) EXPORT_SYMBOL(ax25_ip_xmit);