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Linux/include/linux/sunrpc/svc_xprt.h

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  1 /*
  2  * linux/include/linux/sunrpc/svc_xprt.h
  3  *
  4  * RPC server transport I/O
  5  */
  6 
  7 #ifndef SUNRPC_SVC_XPRT_H
  8 #define SUNRPC_SVC_XPRT_H
  9 
 10 #include <linux/sunrpc/svc.h>
 11 
 12 struct module;
 13 
 14 struct svc_xprt_ops {
 15         struct svc_xprt *(*xpo_create)(struct svc_serv *,
 16                                        struct net *net,
 17                                        struct sockaddr *, int,
 18                                        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 };
 29 
 30 struct svc_xprt_class {
 31         const char              *xcl_name;
 32         struct module           *xcl_owner;
 33         struct svc_xprt_ops     *xcl_ops;
 34         struct list_head        xcl_list;
 35         u32                     xcl_max_payload;
 36         int                     xcl_ident;
 37 };
 38 
 39 /*
 40  * This is embedded in an object that wants a callback before deleting
 41  * an xprt; intended for use by NFSv4.1, which needs to know when a
 42  * client's tcp connection (and hence possibly a backchannel) goes away.
 43  */
 44 struct svc_xpt_user {
 45         struct list_head list;
 46         void (*callback)(struct svc_xpt_user *);
 47 };
 48 
 49 struct svc_xprt {
 50         struct svc_xprt_class   *xpt_class;
 51         struct svc_xprt_ops     *xpt_ops;
 52         struct kref             xpt_ref;
 53         struct list_head        xpt_list;
 54         struct list_head        xpt_ready;
 55         unsigned long           xpt_flags;
 56 #define XPT_BUSY        0               /* enqueued/receiving */
 57 #define XPT_CONN        1               /* conn pending */
 58 #define XPT_CLOSE       2               /* dead or dying */
 59 #define XPT_DATA        3               /* data pending */
 60 #define XPT_TEMP        4               /* connected transport */
 61 #define XPT_DEAD        6               /* transport closed */
 62 #define XPT_CHNGBUF     7               /* need to change snd/rcv buf sizes */
 63 #define XPT_DEFERRED    8               /* deferred request pending */
 64 #define XPT_OLD         9               /* used for xprt aging mark+sweep */
 65 #define XPT_DETACHED    10              /* detached from tempsocks list */
 66 #define XPT_LISTENER    11              /* listening endpoint */
 67 #define XPT_CACHE_AUTH  12              /* cache auth info */
 68 #define XPT_LOCAL       13              /* connection from loopback interface */
 69 
 70         struct svc_serv         *xpt_server;    /* service for transport */
 71         atomic_t                xpt_reserved;   /* space on outq that is rsvd */
 72         struct mutex            xpt_mutex;      /* to serialize sending data */
 73         spinlock_t              xpt_lock;       /* protects sk_deferred
 74                                                  * and xpt_auth_cache */
 75         void                    *xpt_auth_cache;/* auth cache */
 76         struct list_head        xpt_deferred;   /* deferred requests that need
 77                                                  * to be revisted */
 78         struct sockaddr_storage xpt_local;      /* local address */
 79         size_t                  xpt_locallen;   /* length of address */
 80         struct sockaddr_storage xpt_remote;     /* remote peer's address */
 81         size_t                  xpt_remotelen;  /* length of address */
 82         struct rpc_wait_queue   xpt_bc_pending; /* backchannel wait queue */
 83         struct list_head        xpt_users;      /* callbacks on free */
 84 
 85         struct net              *xpt_net;
 86         struct rpc_xprt         *xpt_bc_xprt;   /* NFSv4.1 backchannel */
 87 };
 88 
 89 static inline void unregister_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
 90 {
 91         spin_lock(&xpt->xpt_lock);
 92         list_del_init(&u->list);
 93         spin_unlock(&xpt->xpt_lock);
 94 }
 95 
 96 static inline int register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
 97 {
 98         spin_lock(&xpt->xpt_lock);
 99         if (test_bit(XPT_CLOSE, &xpt->xpt_flags)) {
100                 /*
101                  * The connection is about to be deleted soon (or,
102                  * worse, may already be deleted--in which case we've
103                  * already notified the xpt_users).
104                  */
105                 spin_unlock(&xpt->xpt_lock);
106                 return -ENOTCONN;
107         }
108         list_add(&u->list, &xpt->xpt_users);
109         spin_unlock(&xpt->xpt_lock);
110         return 0;
111 }
112 
113 int     svc_reg_xprt_class(struct svc_xprt_class *);
114 void    svc_unreg_xprt_class(struct svc_xprt_class *);
115 void    svc_xprt_init(struct net *, struct svc_xprt_class *, struct svc_xprt *,
116                       struct svc_serv *);
117 int     svc_create_xprt(struct svc_serv *, const char *, struct net *,
118                         const int, const unsigned short, int);
119 void    svc_xprt_enqueue(struct svc_xprt *xprt);
120 void    svc_xprt_put(struct svc_xprt *xprt);
121 void    svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt);
122 void    svc_close_xprt(struct svc_xprt *xprt);
123 int     svc_port_is_privileged(struct sockaddr *sin);
124 int     svc_print_xprts(char *buf, int maxlen);
125 struct  svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
126                         struct net *net, const sa_family_t af,
127                         const unsigned short port);
128 int     svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen);
129 void    svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *xprt);
130 
131 static inline void svc_xprt_get(struct svc_xprt *xprt)
132 {
133         kref_get(&xprt->xpt_ref);
134 }
135 static inline void svc_xprt_set_local(struct svc_xprt *xprt,
136                                       const struct sockaddr *sa,
137                                       const size_t salen)
138 {
139         memcpy(&xprt->xpt_local, sa, salen);
140         xprt->xpt_locallen = salen;
141 }
142 static inline void svc_xprt_set_remote(struct svc_xprt *xprt,
143                                        const struct sockaddr *sa,
144                                        const size_t salen)
145 {
146         memcpy(&xprt->xpt_remote, sa, salen);
147         xprt->xpt_remotelen = salen;
148 }
149 static inline unsigned short svc_addr_port(const struct sockaddr *sa)
150 {
151         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
152         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
153 
154         switch (sa->sa_family) {
155         case AF_INET:
156                 return ntohs(sin->sin_port);
157         case AF_INET6:
158                 return ntohs(sin6->sin6_port);
159         }
160 
161         return 0;
162 }
163 
164 static inline size_t svc_addr_len(const struct sockaddr *sa)
165 {
166         switch (sa->sa_family) {
167         case AF_INET:
168                 return sizeof(struct sockaddr_in);
169         case AF_INET6:
170                 return sizeof(struct sockaddr_in6);
171         }
172         BUG();
173 }
174 
175 static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
176 {
177         return svc_addr_port((const struct sockaddr *)&xprt->xpt_local);
178 }
179 
180 static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt)
181 {
182         return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote);
183 }
184 
185 static inline char *__svc_print_addr(const struct sockaddr *addr,
186                                      char *buf, const size_t len)
187 {
188         const struct sockaddr_in *sin = (const struct sockaddr_in *)addr;
189         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr;
190 
191         switch (addr->sa_family) {
192         case AF_INET:
193                 snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr,
194                         ntohs(sin->sin_port));
195                 break;
196 
197         case AF_INET6:
198                 snprintf(buf, len, "%pI6, port=%u",
199                          &sin6->sin6_addr,
200                         ntohs(sin6->sin6_port));
201                 break;
202 
203         default:
204                 snprintf(buf, len, "unknown address type: %d", addr->sa_family);
205                 break;
206         }
207 
208         return buf;
209 }
210 #endif /* SUNRPC_SVC_XPRT_H */
211 

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