forked from mirrors/linux
9804501fa1
register_snap_client may return NULL, all the callers check it, but only print a warning. This will result in NULL pointer dereference in unregister_snap_client and other places. It has always been used like this since v2.6 Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
186 lines
4.5 KiB
C
186 lines
4.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_ATALK_H__
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#define __LINUX_ATALK_H__
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#include <net/sock.h>
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#include <uapi/linux/atalk.h>
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struct atalk_route {
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struct net_device *dev;
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struct atalk_addr target;
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struct atalk_addr gateway;
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int flags;
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struct atalk_route *next;
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};
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/**
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* struct atalk_iface - AppleTalk Interface
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* @dev - Network device associated with this interface
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* @address - Our address
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* @status - What are we doing?
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* @nets - Associated direct netrange
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* @next - next element in the list of interfaces
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*/
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struct atalk_iface {
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struct net_device *dev;
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struct atalk_addr address;
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int status;
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#define ATIF_PROBE 1 /* Probing for an address */
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#define ATIF_PROBE_FAIL 2 /* Probe collided */
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struct atalk_netrange nets;
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struct atalk_iface *next;
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};
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struct atalk_sock {
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/* struct sock has to be the first member of atalk_sock */
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struct sock sk;
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__be16 dest_net;
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__be16 src_net;
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unsigned char dest_node;
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unsigned char src_node;
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unsigned char dest_port;
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unsigned char src_port;
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};
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static inline struct atalk_sock *at_sk(struct sock *sk)
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{
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return (struct atalk_sock *)sk;
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}
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struct ddpehdr {
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__be16 deh_len_hops; /* lower 10 bits are length, next 4 - hops */
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__be16 deh_sum;
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__be16 deh_dnet;
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__be16 deh_snet;
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__u8 deh_dnode;
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__u8 deh_snode;
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__u8 deh_dport;
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__u8 deh_sport;
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/* And netatalk apps expect to stick the type in themselves */
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};
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static __inline__ struct ddpehdr *ddp_hdr(struct sk_buff *skb)
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{
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return (struct ddpehdr *)skb_transport_header(skb);
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}
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/* AppleTalk AARP headers */
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struct elapaarp {
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__be16 hw_type;
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#define AARP_HW_TYPE_ETHERNET 1
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#define AARP_HW_TYPE_TOKENRING 2
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__be16 pa_type;
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__u8 hw_len;
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__u8 pa_len;
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#define AARP_PA_ALEN 4
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__be16 function;
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#define AARP_REQUEST 1
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#define AARP_REPLY 2
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#define AARP_PROBE 3
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__u8 hw_src[ETH_ALEN];
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__u8 pa_src_zero;
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__be16 pa_src_net;
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__u8 pa_src_node;
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__u8 hw_dst[ETH_ALEN];
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__u8 pa_dst_zero;
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__be16 pa_dst_net;
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__u8 pa_dst_node;
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} __attribute__ ((packed));
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static __inline__ struct elapaarp *aarp_hdr(struct sk_buff *skb)
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{
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return (struct elapaarp *)skb_transport_header(skb);
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}
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/* Not specified - how long till we drop a resolved entry */
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#define AARP_EXPIRY_TIME (5 * 60 * HZ)
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/* Size of hash table */
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#define AARP_HASH_SIZE 16
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/* Fast retransmission timer when resolving */
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#define AARP_TICK_TIME (HZ / 5)
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/* Send 10 requests then give up (2 seconds) */
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#define AARP_RETRANSMIT_LIMIT 10
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/*
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* Some value bigger than total retransmit time + a bit for last reply to
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* appear and to stop continual requests
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*/
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#define AARP_RESOLVE_TIME (10 * HZ)
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extern struct datalink_proto *ddp_dl, *aarp_dl;
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extern int aarp_proto_init(void);
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/* Inter module exports */
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/* Give a device find its atif control structure */
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#if IS_ENABLED(CONFIG_IRDA) || IS_ENABLED(CONFIG_ATALK)
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static inline struct atalk_iface *atalk_find_dev(struct net_device *dev)
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{
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return dev->atalk_ptr;
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}
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#endif
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extern struct atalk_addr *atalk_find_dev_addr(struct net_device *dev);
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extern struct net_device *atrtr_get_dev(struct atalk_addr *sa);
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extern int aarp_send_ddp(struct net_device *dev,
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struct sk_buff *skb,
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struct atalk_addr *sa, void *hwaddr);
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extern void aarp_device_down(struct net_device *dev);
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extern void aarp_probe_network(struct atalk_iface *atif);
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extern int aarp_proxy_probe_network(struct atalk_iface *atif,
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struct atalk_addr *sa);
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extern void aarp_proxy_remove(struct net_device *dev,
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struct atalk_addr *sa);
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extern void aarp_cleanup_module(void);
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extern struct hlist_head atalk_sockets;
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extern rwlock_t atalk_sockets_lock;
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extern struct atalk_route *atalk_routes;
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extern rwlock_t atalk_routes_lock;
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extern struct atalk_iface *atalk_interfaces;
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extern rwlock_t atalk_interfaces_lock;
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extern struct atalk_route atrtr_default;
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struct aarp_iter_state {
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int bucket;
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struct aarp_entry **table;
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};
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extern const struct seq_operations aarp_seq_ops;
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extern int sysctl_aarp_expiry_time;
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extern int sysctl_aarp_tick_time;
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extern int sysctl_aarp_retransmit_limit;
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extern int sysctl_aarp_resolve_time;
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#ifdef CONFIG_SYSCTL
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extern int atalk_register_sysctl(void);
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extern void atalk_unregister_sysctl(void);
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#else
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static inline int atalk_register_sysctl(void)
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{
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return 0;
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}
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static inline void atalk_unregister_sysctl(void)
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{
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}
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#endif
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#ifdef CONFIG_PROC_FS
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extern int atalk_proc_init(void);
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extern void atalk_proc_exit(void);
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#else
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static inline int atalk_proc_init(void)
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{
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return 0;
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}
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static inline void atalk_proc_exit(void)
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{
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}
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#endif /* CONFIG_PROC_FS */
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#endif /* __LINUX_ATALK_H__ */
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