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79976892f7
refcount_t type should be used instead of int when fib_treeref is used as a reference counter,and avoid use-after-free risks. Signed-off-by: Yajun Deng <yajun.deng@linux.dev> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/r/20210729071350.28919-1-yajun.deng@linux.dev Signed-off-by: Jakub Kicinski <kuba@kernel.org>
167 lines
4 KiB
C
167 lines
4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _NET_DN_FIB_H
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#define _NET_DN_FIB_H
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#include <linux/netlink.h>
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#include <linux/refcount.h>
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extern const struct nla_policy rtm_dn_policy[];
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struct dn_fib_res {
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struct fib_rule *r;
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struct dn_fib_info *fi;
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unsigned char prefixlen;
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unsigned char nh_sel;
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unsigned char type;
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unsigned char scope;
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};
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struct dn_fib_nh {
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struct net_device *nh_dev;
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unsigned int nh_flags;
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unsigned char nh_scope;
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int nh_weight;
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int nh_power;
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int nh_oif;
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__le16 nh_gw;
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};
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struct dn_fib_info {
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struct dn_fib_info *fib_next;
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struct dn_fib_info *fib_prev;
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refcount_t fib_treeref;
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refcount_t fib_clntref;
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int fib_dead;
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unsigned int fib_flags;
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int fib_protocol;
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__le16 fib_prefsrc;
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__u32 fib_priority;
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__u32 fib_metrics[RTAX_MAX];
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int fib_nhs;
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int fib_power;
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struct dn_fib_nh fib_nh[0];
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#define dn_fib_dev fib_nh[0].nh_dev
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};
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#define DN_FIB_RES_RESET(res) ((res).nh_sel = 0)
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#define DN_FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
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#define DN_FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __dn_fib_res_prefsrc(&res))
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#define DN_FIB_RES_GW(res) (DN_FIB_RES_NH(res).nh_gw)
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#define DN_FIB_RES_DEV(res) (DN_FIB_RES_NH(res).nh_dev)
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#define DN_FIB_RES_OIF(res) (DN_FIB_RES_NH(res).nh_oif)
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typedef struct {
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__le16 datum;
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} dn_fib_key_t;
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typedef struct {
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__le16 datum;
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} dn_fib_hash_t;
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typedef struct {
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__u16 datum;
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} dn_fib_idx_t;
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struct dn_fib_node {
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struct dn_fib_node *fn_next;
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struct dn_fib_info *fn_info;
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#define DN_FIB_INFO(f) ((f)->fn_info)
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dn_fib_key_t fn_key;
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u8 fn_type;
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u8 fn_scope;
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u8 fn_state;
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};
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struct dn_fib_table {
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struct hlist_node hlist;
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u32 n;
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int (*insert)(struct dn_fib_table *t, struct rtmsg *r,
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struct nlattr *attrs[], struct nlmsghdr *n,
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struct netlink_skb_parms *req);
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int (*delete)(struct dn_fib_table *t, struct rtmsg *r,
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struct nlattr *attrs[], struct nlmsghdr *n,
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struct netlink_skb_parms *req);
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int (*lookup)(struct dn_fib_table *t, const struct flowidn *fld,
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struct dn_fib_res *res);
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int (*flush)(struct dn_fib_table *t);
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int (*dump)(struct dn_fib_table *t, struct sk_buff *skb, struct netlink_callback *cb);
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unsigned char data[];
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};
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#ifdef CONFIG_DECNET_ROUTER
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/*
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* dn_fib.c
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*/
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void dn_fib_init(void);
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void dn_fib_cleanup(void);
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int dn_fib_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
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struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r,
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struct nlattr *attrs[],
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const struct nlmsghdr *nlh, int *errp);
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int dn_fib_semantic_match(int type, struct dn_fib_info *fi,
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const struct flowidn *fld, struct dn_fib_res *res);
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void dn_fib_release_info(struct dn_fib_info *fi);
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void dn_fib_flush(void);
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void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res);
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/*
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* dn_tables.c
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*/
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struct dn_fib_table *dn_fib_get_table(u32 n, int creat);
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struct dn_fib_table *dn_fib_empty_table(void);
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void dn_fib_table_init(void);
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void dn_fib_table_cleanup(void);
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/*
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* dn_rules.c
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*/
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void dn_fib_rules_init(void);
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void dn_fib_rules_cleanup(void);
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unsigned int dnet_addr_type(__le16 addr);
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int dn_fib_lookup(struct flowidn *fld, struct dn_fib_res *res);
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int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb);
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void dn_fib_free_info(struct dn_fib_info *fi);
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static inline void dn_fib_info_put(struct dn_fib_info *fi)
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{
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if (refcount_dec_and_test(&fi->fib_clntref))
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dn_fib_free_info(fi);
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}
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static inline void dn_fib_res_put(struct dn_fib_res *res)
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{
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if (res->fi)
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dn_fib_info_put(res->fi);
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if (res->r)
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fib_rule_put(res->r);
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}
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#else /* Endnode */
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#define dn_fib_init() do { } while(0)
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#define dn_fib_cleanup() do { } while(0)
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#define dn_fib_lookup(fl, res) (-ESRCH)
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#define dn_fib_info_put(fi) do { } while(0)
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#define dn_fib_select_multipath(fl, res) do { } while(0)
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#define dn_fib_rules_policy(saddr,res,flags) (0)
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#define dn_fib_res_put(res) do { } while(0)
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#endif /* CONFIG_DECNET_ROUTER */
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static inline __le16 dnet_make_mask(int n)
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{
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if (n)
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return cpu_to_le16(~((1 << (16 - n)) - 1));
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return cpu_to_le16(0);
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}
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#endif /* _NET_DN_FIB_H */
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