^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/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/slab.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/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <net/ax25.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <net/rose.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static struct sk_buff_head loopback_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define ROSE_LOOPBACK_LIMIT 1000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static struct timer_list loopback_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static void rose_set_loopback_timer(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static void rose_loopback_timer(struct timer_list *unused);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) void rose_loopback_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) skb_queue_head_init(&loopback_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) timer_setup(&loopback_timer, rose_loopback_timer, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static int rose_loopback_running(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) return timer_pending(&loopback_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) int rose_loopback_queue(struct sk_buff *skb, struct rose_neigh *neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct sk_buff *skbn = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (skb_queue_len(&loopback_queue) < ROSE_LOOPBACK_LIMIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) skbn = skb_clone(skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) if (skbn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) consume_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) skb_queue_tail(&loopback_queue, skbn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) if (!rose_loopback_running())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) rose_set_loopback_timer();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static void rose_set_loopback_timer(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) mod_timer(&loopback_timer, jiffies + 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static void rose_loopback_timer(struct timer_list *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) rose_address *dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) unsigned short frametype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) unsigned int lci_i, lci_o;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) for (count = 0; count < ROSE_LOOPBACK_LIMIT; count++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) skb = skb_dequeue(&loopback_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (skb->len < ROSE_MIN_LEN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) lci_i = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) frametype = skb->data[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (frametype == ROSE_CALL_REQUEST &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) ROSE_CALL_REQ_ADDR_LEN_VAL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) dest = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) lci_o = ROSE_DEFAULT_MAXVC + 1 - lci_i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) skb_reset_transport_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) sk = rose_find_socket(lci_o, rose_loopback_neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (sk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (rose_process_rx_frame(sk, skb) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (frametype == ROSE_CALL_REQUEST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (!rose_loopback_neigh->dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) continue;
^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) dev = rose_dev_get(dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (!dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) continue;
^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) if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (!skb_queue_empty(&loopback_queue))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) mod_timer(&loopback_timer, jiffies + 1);
^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) void __exit rose_loopback_clear(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) del_timer(&loopback_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) skb->sk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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