^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Generic HDLC support routines for Linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Cisco HDLC support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2000 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/hdlc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/if_arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/inetdevice.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) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/pkt_sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/rtnetlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #undef DEBUG_HARD_HEADER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define CISCO_MULTICAST 0x8F /* Cisco multicast address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define CISCO_UNICAST 0x0F /* Cisco unicast address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define CISCO_SYS_INFO 0x2000 /* Cisco interface/system info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define CISCO_ADDR_REQ 0 /* Cisco address request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define CISCO_ADDR_REPLY 1 /* Cisco address reply */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct hdlc_header {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) u8 address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) u8 control;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) __be16 protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }__packed;
^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) struct cisco_packet {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) __be32 type; /* code */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) __be32 par1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) __be32 par2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) __be16 rel; /* reliability */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) __be32 time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }__packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define CISCO_PACKET_LEN 18
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define CISCO_BIG_PACKET_LEN 20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct cisco_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) cisco_proto settings;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct timer_list timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) unsigned long last_poll;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) int up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) u32 txseq; /* TX sequence number, 0 = none */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) u32 rxseq; /* RX sequence number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr);
^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) static inline struct cisco_state* state(hdlc_device *hdlc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return (struct cisco_state *)hdlc->state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static int cisco_hard_header(struct sk_buff *skb, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) u16 type, const void *daddr, const void *saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) struct hdlc_header *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #ifdef DEBUG_HARD_HEADER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) netdev_dbg(dev, "%s called\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) skb_push(skb, sizeof(struct hdlc_header));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) data = (struct hdlc_header*)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (type == CISCO_KEEPALIVE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) data->address = CISCO_MULTICAST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) data->address = CISCO_UNICAST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) data->control = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) data->protocol = htons(type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return sizeof(struct hdlc_header);
^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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) static void cisco_keepalive_send(struct net_device *dev, u32 type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) __be32 par1, __be32 par2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) struct cisco_packet *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) skb = dev_alloc_skb(sizeof(struct hdlc_header) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) sizeof(struct cisco_packet));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (!skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) netdev_warn(dev, "Memory squeeze on %s()\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) skb_reserve(skb, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) cisco_hard_header(skb, dev, CISCO_KEEPALIVE, NULL, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) data = (struct cisco_packet*)(skb->data + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) data->type = htonl(type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) data->par1 = par1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) data->par2 = par2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) data->rel = cpu_to_be16(0xFFFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* we will need do_div here if 1000 % HZ != 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) skb_put(skb, sizeof(struct cisco_packet));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) skb->priority = TC_PRIO_CONTROL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) skb->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) skb->protocol = htons(ETH_P_HDLC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) dev_queue_xmit(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static __be16 cisco_type_trans(struct sk_buff *skb, struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct hdlc_header *data = (struct hdlc_header*)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (skb->len < sizeof(struct hdlc_header))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return cpu_to_be16(ETH_P_HDLC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (data->address != CISCO_MULTICAST &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) data->address != CISCO_UNICAST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return cpu_to_be16(ETH_P_HDLC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) switch (data->protocol) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) case cpu_to_be16(ETH_P_IP):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) case cpu_to_be16(ETH_P_IPX):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) case cpu_to_be16(ETH_P_IPV6):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) skb_pull(skb, sizeof(struct hdlc_header));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return data->protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return cpu_to_be16(ETH_P_HDLC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static int cisco_rx(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) struct net_device *dev = skb->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) hdlc_device *hdlc = dev_to_hdlc(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) struct cisco_state *st = state(hdlc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) struct hdlc_header *data = (struct hdlc_header*)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) struct cisco_packet *cisco_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) struct in_device *in_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) __be32 addr, mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) u32 ack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (skb->len < sizeof(struct hdlc_header))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) goto rx_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (data->address != CISCO_MULTICAST &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) data->address != CISCO_UNICAST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) goto rx_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) switch (ntohs(data->protocol)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) case CISCO_SYS_INFO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /* Packet is not needed, drop it. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) dev_kfree_skb_any(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return NET_RX_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) case CISCO_KEEPALIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if ((skb->len != sizeof(struct hdlc_header) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) CISCO_PACKET_LEN) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) (skb->len != sizeof(struct hdlc_header) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) CISCO_BIG_PACKET_LEN)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) netdev_info(dev, "Invalid length of Cisco control packet (%d bytes)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) goto rx_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) cisco_data = (struct cisco_packet*)(skb->data + sizeof
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) (struct hdlc_header));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) switch (ntohl (cisco_data->type)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) in_dev = __in_dev_get_rcu(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) mask = ~cpu_to_be32(0); /* is the mask correct? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) if (in_dev != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) const struct in_ifaddr *ifa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) in_dev_for_each_ifa_rcu(ifa, in_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (strcmp(dev->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) ifa->ifa_label) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) addr = ifa->ifa_local;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) mask = ifa->ifa_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) cisco_keepalive_send(dev, CISCO_ADDR_REPLY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) addr, mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) dev_kfree_skb_any(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) return NET_RX_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) case CISCO_ADDR_REPLY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) netdev_info(dev, "Unexpected Cisco IP address reply\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) goto rx_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) case CISCO_KEEPALIVE_REQ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) spin_lock(&st->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) st->rxseq = ntohl(cisco_data->par1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) ack = ntohl(cisco_data->par2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (ack && (ack == st->txseq ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) /* our current REQ may be in transit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) ack == st->txseq - 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) st->last_poll = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (!st->up) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) u32 sec, min, hrs, days;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) sec = ntohl(cisco_data->time) / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) min = sec / 60; sec -= min * 60;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) hrs = min / 60; min -= hrs * 60;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) days = hrs / 24; hrs -= days * 24;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) netdev_info(dev, "Link up (peer uptime %ud%uh%um%us)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) days, hrs, min, sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) netif_dormant_off(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) st->up = 1;
^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) spin_unlock(&st->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) dev_kfree_skb_any(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return NET_RX_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) } /* switch (keepalive type) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) } /* switch (protocol) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) netdev_info(dev, "Unsupported protocol %x\n", ntohs(data->protocol));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) dev_kfree_skb_any(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) rx_error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) dev->stats.rx_errors++; /* Mark error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) dev_kfree_skb_any(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) static void cisco_timer(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) struct cisco_state *st = from_timer(st, t, timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) struct net_device *dev = st->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) spin_lock(&st->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) if (st->up &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) time_after(jiffies, st->last_poll + st->settings.timeout * HZ)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) st->up = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) netdev_info(dev, "Link down\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) netif_dormant_on(dev);
^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) cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ, htonl(++st->txseq),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) htonl(st->rxseq));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) spin_unlock(&st->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) st->timer.expires = jiffies + st->settings.interval * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) add_timer(&st->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) static void cisco_start(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) hdlc_device *hdlc = dev_to_hdlc(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) struct cisco_state *st = state(hdlc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) spin_lock_irqsave(&st->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) st->up = st->txseq = st->rxseq = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) spin_unlock_irqrestore(&st->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) st->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) timer_setup(&st->timer, cisco_timer, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) st->timer.expires = jiffies + HZ; /* First poll after 1 s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) add_timer(&st->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) static void cisco_stop(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) hdlc_device *hdlc = dev_to_hdlc(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) struct cisco_state *st = state(hdlc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) del_timer_sync(&st->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) spin_lock_irqsave(&st->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) netif_dormant_on(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) st->up = st->txseq = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) spin_unlock_irqrestore(&st->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static struct hdlc_proto proto = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) .start = cisco_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) .stop = cisco_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) .type_trans = cisco_type_trans,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) .ioctl = cisco_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) .netif_rx = cisco_rx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) .module = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) static const struct header_ops cisco_header_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) .create = cisco_hard_header,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) const size_t size = sizeof(cisco_proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) cisco_proto new_settings;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) hdlc_device *hdlc = dev_to_hdlc(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) switch (ifr->ifr_settings.type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) case IF_GET_PROTO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) if (dev_to_hdlc(dev)->proto != &proto)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) ifr->ifr_settings.type = IF_PROTO_CISCO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) if (ifr->ifr_settings.size < size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) ifr->ifr_settings.size = size; /* data size wanted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (copy_to_user(cisco_s, &state(hdlc)->settings, size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) case IF_PROTO_CISCO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) if (!capable(CAP_NET_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) if (dev->flags & IFF_UP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if (copy_from_user(&new_settings, cisco_s, size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) if (new_settings.interval < 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) new_settings.timeout < 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) result = hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) result = attach_hdlc_protocol(dev, &proto,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) sizeof(struct cisco_state));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) if (result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) memcpy(&state(hdlc)->settings, &new_settings, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) spin_lock_init(&state(hdlc)->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) dev->header_ops = &cisco_header_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) dev->hard_header_len = sizeof(struct hdlc_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) dev->type = ARPHRD_CISCO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) netif_dormant_on(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) static int __init mod_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) register_hdlc_protocol(&proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) static void __exit mod_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) unregister_hdlc_protocol(&proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) module_init(mod_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) module_exit(mod_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) MODULE_DESCRIPTION("Cisco HDLC protocol support for generic HDLC");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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