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229 lines
7.0 KiB
229 lines
7.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* linux/include/linux/sunrpc/svc_xprt.h |
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* |
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* RPC server transport I/O |
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*/ |
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#ifndef SUNRPC_SVC_XPRT_H |
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#define SUNRPC_SVC_XPRT_H |
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#include <linux/sunrpc/svc.h> |
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struct module; |
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struct svc_xprt_ops { |
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struct svc_xprt *(*xpo_create)(struct svc_serv *, |
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struct net *net, |
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struct sockaddr *, int, |
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int); |
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struct svc_xprt *(*xpo_accept)(struct svc_xprt *); |
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int (*xpo_has_wspace)(struct svc_xprt *); |
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int (*xpo_recvfrom)(struct svc_rqst *); |
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int (*xpo_sendto)(struct svc_rqst *); |
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int (*xpo_result_payload)(struct svc_rqst *, unsigned int, |
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unsigned int); |
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void (*xpo_release_rqst)(struct svc_rqst *); |
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void (*xpo_detach)(struct svc_xprt *); |
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void (*xpo_free)(struct svc_xprt *); |
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void (*xpo_secure_port)(struct svc_rqst *rqstp); |
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void (*xpo_kill_temp_xprt)(struct svc_xprt *); |
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}; |
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struct svc_xprt_class { |
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const char *xcl_name; |
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struct module *xcl_owner; |
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const struct svc_xprt_ops *xcl_ops; |
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struct list_head xcl_list; |
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u32 xcl_max_payload; |
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int xcl_ident; |
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}; |
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/* |
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* This is embedded in an object that wants a callback before deleting |
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* an xprt; intended for use by NFSv4.1, which needs to know when a |
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* client's tcp connection (and hence possibly a backchannel) goes away. |
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*/ |
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struct svc_xpt_user { |
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struct list_head list; |
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void (*callback)(struct svc_xpt_user *); |
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}; |
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struct svc_xprt { |
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struct svc_xprt_class *xpt_class; |
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const struct svc_xprt_ops *xpt_ops; |
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struct kref xpt_ref; |
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struct list_head xpt_list; |
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struct list_head xpt_ready; |
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unsigned long xpt_flags; |
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#define XPT_BUSY 0 /* enqueued/receiving */ |
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#define XPT_CONN 1 /* conn pending */ |
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#define XPT_CLOSE 2 /* dead or dying */ |
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#define XPT_DATA 3 /* data pending */ |
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#define XPT_TEMP 4 /* connected transport */ |
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#define XPT_DEAD 6 /* transport closed */ |
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#define XPT_CHNGBUF 7 /* need to change snd/rcv buf sizes */ |
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#define XPT_DEFERRED 8 /* deferred request pending */ |
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#define XPT_OLD 9 /* used for xprt aging mark+sweep */ |
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#define XPT_LISTENER 10 /* listening endpoint */ |
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#define XPT_CACHE_AUTH 11 /* cache auth info */ |
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#define XPT_LOCAL 12 /* connection from loopback interface */ |
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#define XPT_KILL_TEMP 13 /* call xpo_kill_temp_xprt before closing */ |
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#define XPT_CONG_CTRL 14 /* has congestion control */ |
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struct svc_serv *xpt_server; /* service for transport */ |
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atomic_t xpt_reserved; /* space on outq that is rsvd */ |
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atomic_t xpt_nr_rqsts; /* Number of requests */ |
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struct mutex xpt_mutex; /* to serialize sending data */ |
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spinlock_t xpt_lock; /* protects sk_deferred |
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* and xpt_auth_cache */ |
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void *xpt_auth_cache;/* auth cache */ |
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struct list_head xpt_deferred; /* deferred requests that need |
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* to be revisted */ |
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struct sockaddr_storage xpt_local; /* local address */ |
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size_t xpt_locallen; /* length of address */ |
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struct sockaddr_storage xpt_remote; /* remote peer's address */ |
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size_t xpt_remotelen; /* length of address */ |
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char xpt_remotebuf[INET6_ADDRSTRLEN + 10]; |
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struct list_head xpt_users; /* callbacks on free */ |
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struct net *xpt_net; |
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const struct cred *xpt_cred; |
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struct rpc_xprt *xpt_bc_xprt; /* NFSv4.1 backchannel */ |
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struct rpc_xprt_switch *xpt_bc_xps; /* NFSv4.1 backchannel */ |
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}; |
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static inline void unregister_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u) |
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{ |
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spin_lock(&xpt->xpt_lock); |
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list_del_init(&u->list); |
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spin_unlock(&xpt->xpt_lock); |
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} |
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static inline int register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u) |
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{ |
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spin_lock(&xpt->xpt_lock); |
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if (test_bit(XPT_CLOSE, &xpt->xpt_flags)) { |
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/* |
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* The connection is about to be deleted soon (or, |
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* worse, may already be deleted--in which case we've |
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* already notified the xpt_users). |
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*/ |
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spin_unlock(&xpt->xpt_lock); |
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return -ENOTCONN; |
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} |
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list_add(&u->list, &xpt->xpt_users); |
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spin_unlock(&xpt->xpt_lock); |
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return 0; |
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} |
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static inline bool svc_xprt_is_dead(const struct svc_xprt *xprt) |
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{ |
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return (test_bit(XPT_DEAD, &xprt->xpt_flags) != 0) || |
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(test_bit(XPT_CLOSE, &xprt->xpt_flags) != 0); |
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} |
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int svc_reg_xprt_class(struct svc_xprt_class *); |
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void svc_unreg_xprt_class(struct svc_xprt_class *); |
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void svc_xprt_init(struct net *, struct svc_xprt_class *, struct svc_xprt *, |
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struct svc_serv *); |
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int svc_create_xprt(struct svc_serv *, const char *, struct net *, |
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const int, const unsigned short, int, |
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const struct cred *); |
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void svc_xprt_do_enqueue(struct svc_xprt *xprt); |
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void svc_xprt_enqueue(struct svc_xprt *xprt); |
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void svc_xprt_put(struct svc_xprt *xprt); |
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void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt); |
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void svc_close_xprt(struct svc_xprt *xprt); |
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int svc_port_is_privileged(struct sockaddr *sin); |
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int svc_print_xprts(char *buf, int maxlen); |
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struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name, |
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struct net *net, const sa_family_t af, |
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const unsigned short port); |
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int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen); |
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void svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *xprt); |
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void svc_age_temp_xprts_now(struct svc_serv *, struct sockaddr *); |
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static inline void svc_xprt_get(struct svc_xprt *xprt) |
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{ |
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kref_get(&xprt->xpt_ref); |
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} |
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static inline void svc_xprt_set_local(struct svc_xprt *xprt, |
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const struct sockaddr *sa, |
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const size_t salen) |
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{ |
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memcpy(&xprt->xpt_local, sa, salen); |
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xprt->xpt_locallen = salen; |
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} |
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static inline void svc_xprt_set_remote(struct svc_xprt *xprt, |
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const struct sockaddr *sa, |
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const size_t salen) |
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{ |
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memcpy(&xprt->xpt_remote, sa, salen); |
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xprt->xpt_remotelen = salen; |
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snprintf(xprt->xpt_remotebuf, sizeof(xprt->xpt_remotebuf) - 1, |
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"%pISpc", sa); |
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} |
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static inline unsigned short svc_addr_port(const struct sockaddr *sa) |
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{ |
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const struct sockaddr_in *sin = (const struct sockaddr_in *)sa; |
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const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa; |
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switch (sa->sa_family) { |
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case AF_INET: |
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return ntohs(sin->sin_port); |
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case AF_INET6: |
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return ntohs(sin6->sin6_port); |
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} |
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return 0; |
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} |
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static inline size_t svc_addr_len(const struct sockaddr *sa) |
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{ |
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switch (sa->sa_family) { |
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case AF_INET: |
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return sizeof(struct sockaddr_in); |
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case AF_INET6: |
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return sizeof(struct sockaddr_in6); |
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} |
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BUG(); |
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} |
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static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt) |
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{ |
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return svc_addr_port((const struct sockaddr *)&xprt->xpt_local); |
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} |
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static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt) |
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{ |
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return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote); |
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} |
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static inline char *__svc_print_addr(const struct sockaddr *addr, |
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char *buf, const size_t len) |
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{ |
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const struct sockaddr_in *sin = (const struct sockaddr_in *)addr; |
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const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr; |
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switch (addr->sa_family) { |
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case AF_INET: |
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snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr, |
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ntohs(sin->sin_port)); |
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break; |
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case AF_INET6: |
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snprintf(buf, len, "%pI6, port=%u", |
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&sin6->sin6_addr, |
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ntohs(sin6->sin6_port)); |
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break; |
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default: |
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snprintf(buf, len, "unknown address type: %d", addr->sa_family); |
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break; |
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} |
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return buf; |
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} |
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#endif /* SUNRPC_SVC_XPRT_H */
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