2 * linux/include/linux/sunrpc/svc_xprt.h
4 * RPC server transport I/O
7 #ifndef SUNRPC_SVC_XPRT_H
8 #define SUNRPC_SVC_XPRT_H
10 #include <linux/sunrpc/svc.h>
15 struct svc_xprt *(*xpo_create)(struct svc_serv *,
17 struct sockaddr *, int,
19 struct svc_xprt *(*xpo_accept)(struct svc_xprt *);
20 int (*xpo_has_wspace)(struct svc_xprt *);
21 int (*xpo_recvfrom)(struct svc_rqst *);
22 void (*xpo_prep_reply_hdr)(struct svc_rqst *);
23 int (*xpo_sendto)(struct svc_rqst *);
24 void (*xpo_release_rqst)(struct svc_rqst *);
25 void (*xpo_detach)(struct svc_xprt *);
26 void (*xpo_free)(struct svc_xprt *);
27 int (*xpo_secure_port)(struct svc_rqst *);
28 void (*xpo_kill_temp_xprt)(struct svc_xprt *);
31 struct svc_xprt_class {
33 struct module *xcl_owner;
34 struct svc_xprt_ops *xcl_ops;
35 struct list_head xcl_list;
41 * This is embedded in an object that wants a callback before deleting
42 * an xprt; intended for use by NFSv4.1, which needs to know when a
43 * client's tcp connection (and hence possibly a backchannel) goes away.
46 struct list_head list;
47 void (*callback)(struct svc_xpt_user *);
51 struct svc_xprt_class *xpt_class;
52 struct svc_xprt_ops *xpt_ops;
54 struct list_head xpt_list;
55 struct list_head xpt_ready;
56 unsigned long xpt_flags;
57 #define XPT_BUSY 0 /* enqueued/receiving */
58 #define XPT_CONN 1 /* conn pending */
59 #define XPT_CLOSE 2 /* dead or dying */
60 #define XPT_DATA 3 /* data pending */
61 #define XPT_TEMP 4 /* connected transport */
62 #define XPT_DEAD 6 /* transport closed */
63 #define XPT_CHNGBUF 7 /* need to change snd/rcv buf sizes */
64 #define XPT_DEFERRED 8 /* deferred request pending */
65 #define XPT_OLD 9 /* used for xprt aging mark+sweep */
66 #define XPT_LISTENER 10 /* listening endpoint */
67 #define XPT_CACHE_AUTH 11 /* cache auth info */
68 #define XPT_LOCAL 12 /* connection from loopback interface */
69 #define XPT_KILL_TEMP 13 /* call xpo_kill_temp_xprt before closing */
70 #define XPT_CONG_CTRL 14 /* has congestion control */
72 struct svc_serv *xpt_server; /* service for transport */
73 atomic_t xpt_reserved; /* space on outq that is rsvd */
74 atomic_t xpt_nr_rqsts; /* Number of requests */
75 struct mutex xpt_mutex; /* to serialize sending data */
76 spinlock_t xpt_lock; /* protects sk_deferred
77 * and xpt_auth_cache */
78 void *xpt_auth_cache;/* auth cache */
79 struct list_head xpt_deferred; /* deferred requests that need
81 struct sockaddr_storage xpt_local; /* local address */
82 size_t xpt_locallen; /* length of address */
83 struct sockaddr_storage xpt_remote; /* remote peer's address */
84 size_t xpt_remotelen; /* length of address */
85 struct rpc_wait_queue xpt_bc_pending; /* backchannel wait queue */
86 struct list_head xpt_users; /* callbacks on free */
89 struct rpc_xprt *xpt_bc_xprt; /* NFSv4.1 backchannel */
90 struct rpc_xprt_switch *xpt_bc_xps; /* NFSv4.1 backchannel */
93 static inline void unregister_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
95 spin_lock(&xpt->xpt_lock);
96 list_del_init(&u->list);
97 spin_unlock(&xpt->xpt_lock);
100 static inline int register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
102 spin_lock(&xpt->xpt_lock);
103 if (test_bit(XPT_CLOSE, &xpt->xpt_flags)) {
105 * The connection is about to be deleted soon (or,
106 * worse, may already be deleted--in which case we've
107 * already notified the xpt_users).
109 spin_unlock(&xpt->xpt_lock);
112 list_add(&u->list, &xpt->xpt_users);
113 spin_unlock(&xpt->xpt_lock);
117 int svc_reg_xprt_class(struct svc_xprt_class *);
118 void svc_unreg_xprt_class(struct svc_xprt_class *);
119 void svc_xprt_init(struct net *, struct svc_xprt_class *, struct svc_xprt *,
121 int svc_create_xprt(struct svc_serv *, const char *, struct net *,
122 const int, const unsigned short, int);
123 void svc_xprt_do_enqueue(struct svc_xprt *xprt);
124 void svc_xprt_enqueue(struct svc_xprt *xprt);
125 void svc_xprt_put(struct svc_xprt *xprt);
126 void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt);
127 void svc_close_xprt(struct svc_xprt *xprt);
128 int svc_port_is_privileged(struct sockaddr *sin);
129 int svc_print_xprts(char *buf, int maxlen);
130 struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
131 struct net *net, const sa_family_t af,
132 const unsigned short port);
133 int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen);
134 void svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *xprt);
135 void svc_age_temp_xprts_now(struct svc_serv *, struct sockaddr *);
137 static inline void svc_xprt_get(struct svc_xprt *xprt)
139 kref_get(&xprt->xpt_ref);
141 static inline void svc_xprt_set_local(struct svc_xprt *xprt,
142 const struct sockaddr *sa,
145 memcpy(&xprt->xpt_local, sa, salen);
146 xprt->xpt_locallen = salen;
148 static inline void svc_xprt_set_remote(struct svc_xprt *xprt,
149 const struct sockaddr *sa,
152 memcpy(&xprt->xpt_remote, sa, salen);
153 xprt->xpt_remotelen = salen;
155 static inline unsigned short svc_addr_port(const struct sockaddr *sa)
157 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
158 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
160 switch (sa->sa_family) {
162 return ntohs(sin->sin_port);
164 return ntohs(sin6->sin6_port);
170 static inline size_t svc_addr_len(const struct sockaddr *sa)
172 switch (sa->sa_family) {
174 return sizeof(struct sockaddr_in);
176 return sizeof(struct sockaddr_in6);
181 static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
183 return svc_addr_port((const struct sockaddr *)&xprt->xpt_local);
186 static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt)
188 return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote);
191 static inline char *__svc_print_addr(const struct sockaddr *addr,
192 char *buf, const size_t len)
194 const struct sockaddr_in *sin = (const struct sockaddr_in *)addr;
195 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr;
197 switch (addr->sa_family) {
199 snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr,
200 ntohs(sin->sin_port));
204 snprintf(buf, len, "%pI6, port=%u",
206 ntohs(sin6->sin6_port));
210 snprintf(buf, len, "unknown address type: %d", addr->sa_family);
216 #endif /* SUNRPC_SVC_XPRT_H */