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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 };
 28 
 29 struct svc_xprt_class {
 30         const char              *xcl_name;
 31         struct module           *xcl_owner;
 32         struct svc_xprt_ops     *xcl_ops;
 33         struct list_head        xcl_list;
 34         u32                     xcl_max_payload;
 35         int                     xcl_ident;
 36 };
 37 
 38 /*
 39  * This is embedded in an object that wants a callback before deleting
 40  * an xprt; intended for use by NFSv4.1, which needs to know when a
 41  * client's tcp connection (and hence possibly a backchannel) goes away.
 42  */
 43 struct svc_xpt_user {
 44         struct list_head list;
 45         void (*callback)(struct svc_xpt_user *);
 46 };
 47 
 48 struct svc_xprt {
 49         struct svc_xprt_class   *xpt_class;
 50         struct svc_xprt_ops     *xpt_ops;
 51         struct kref             xpt_ref;
 52         struct list_head        xpt_list;
 53         struct list_head        xpt_ready;
 54         unsigned long           xpt_flags;
 55 #define XPT_BUSY        0               /* enqueued/receiving */
 56 #define XPT_CONN        1               /* conn pending */
 57 #define XPT_CLOSE       2               /* dead or dying */
 58 #define XPT_DATA        3               /* data pending */
 59 #define XPT_TEMP        4               /* connected transport */
 60 #define XPT_DEAD        6               /* transport closed */
 61 #define XPT_CHNGBUF     7               /* need to change snd/rcv buf sizes */
 62 #define XPT_DEFERRED    8               /* deferred request pending */
 63 #define XPT_OLD         9               /* used for xprt aging mark+sweep */
 64 #define XPT_DETACHED    10              /* detached from tempsocks list */
 65 #define XPT_LISTENER    11              /* listening endpoint */
 66 #define XPT_CACHE_AUTH  12              /* cache auth info */
 67 
 68         struct svc_serv         *xpt_server;    /* service for transport */
 69         atomic_t                xpt_reserved;   /* space on outq that is rsvd */
 70         struct mutex            xpt_mutex;      /* to serialize sending data */
 71         spinlock_t              xpt_lock;       /* protects sk_deferred
 72                                                  * and xpt_auth_cache */
 73         void                    *xpt_auth_cache;/* auth cache */
 74         struct list_head        xpt_deferred;   /* deferred requests that need
 75                                                  * to be revisted */
 76         struct sockaddr_storage xpt_local;      /* local address */
 77         size_t                  xpt_locallen;   /* length of address */
 78         struct sockaddr_storage xpt_remote;     /* remote peer's address */
 79         size_t                  xpt_remotelen;  /* length of address */
 80         struct rpc_wait_queue   xpt_bc_pending; /* backchannel wait queue */
 81         struct list_head        xpt_users;      /* callbacks on free */
 82 
 83         struct net              *xpt_net;
 84         struct rpc_xprt         *xpt_bc_xprt;   /* NFSv4.1 backchannel */
 85 };
 86 
 87 static inline void unregister_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
 88 {
 89         spin_lock(&xpt->xpt_lock);
 90         list_del_init(&u->list);
 91         spin_unlock(&xpt->xpt_lock);
 92 }
 93 
 94 static inline int register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
 95 {
 96         spin_lock(&xpt->xpt_lock);
 97         if (test_bit(XPT_CLOSE, &xpt->xpt_flags)) {
 98                 /*
 99                  * The connection is about to be deleted soon (or,
100                  * worse, may already be deleted--in which case we've
101                  * already notified the xpt_users).
102                  */
103                 spin_unlock(&xpt->xpt_lock);
104                 return -ENOTCONN;
105         }
106         list_add(&u->list, &xpt->xpt_users);
107         spin_unlock(&xpt->xpt_lock);
108         return 0;
109 }
110 
111 int     svc_reg_xprt_class(struct svc_xprt_class *);
112 void    svc_unreg_xprt_class(struct svc_xprt_class *);
113 void    svc_xprt_init(struct net *, struct svc_xprt_class *, struct svc_xprt *,
114                       struct svc_serv *);
115 int     svc_create_xprt(struct svc_serv *, const char *, struct net *,
116                         const int, const unsigned short, int);
117 void    svc_xprt_enqueue(struct svc_xprt *xprt);
118 void    svc_xprt_put(struct svc_xprt *xprt);
119 void    svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt);
120 void    svc_close_xprt(struct svc_xprt *xprt);
121 int     svc_port_is_privileged(struct sockaddr *sin);
122 int     svc_print_xprts(char *buf, int maxlen);
123 struct  svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
124                         struct net *net, const sa_family_t af,
125                         const unsigned short port);
126 int     svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen);
127 void    svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *xprt);
128 
129 static inline void svc_xprt_get(struct svc_xprt *xprt)
130 {
131         kref_get(&xprt->xpt_ref);
132 }
133 static inline void svc_xprt_set_local(struct svc_xprt *xprt,
134                                       const struct sockaddr *sa,
135                                       const size_t salen)
136 {
137         memcpy(&xprt->xpt_local, sa, salen);
138         xprt->xpt_locallen = salen;
139 }
140 static inline void svc_xprt_set_remote(struct svc_xprt *xprt,
141                                        const struct sockaddr *sa,
142                                        const size_t salen)
143 {
144         memcpy(&xprt->xpt_remote, sa, salen);
145         xprt->xpt_remotelen = salen;
146 }
147 static inline unsigned short svc_addr_port(const struct sockaddr *sa)
148 {
149         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
150         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
151 
152         switch (sa->sa_family) {
153         case AF_INET:
154                 return ntohs(sin->sin_port);
155         case AF_INET6:
156                 return ntohs(sin6->sin6_port);
157         }
158 
159         return 0;
160 }
161 
162 static inline size_t svc_addr_len(const struct sockaddr *sa)
163 {
164         switch (sa->sa_family) {
165         case AF_INET:
166                 return sizeof(struct sockaddr_in);
167         case AF_INET6:
168                 return sizeof(struct sockaddr_in6);
169         }
170         BUG();
171 }
172 
173 static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
174 {
175         return svc_addr_port((const struct sockaddr *)&xprt->xpt_local);
176 }
177 
178 static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt)
179 {
180         return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote);
181 }
182 
183 static inline char *__svc_print_addr(const struct sockaddr *addr,
184                                      char *buf, const size_t len)
185 {
186         const struct sockaddr_in *sin = (const struct sockaddr_in *)addr;
187         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr;
188 
189         switch (addr->sa_family) {
190         case AF_INET:
191                 snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr,
192                         ntohs(sin->sin_port));
193                 break;
194 
195         case AF_INET6:
196                 snprintf(buf, len, "%pI6, port=%u",
197                          &sin6->sin6_addr,
198                         ntohs(sin6->sin6_port));
199                 break;
200 
201         default:
202                 snprintf(buf, len, "unknown address type: %d", addr->sa_family);
203                 break;
204         }
205 
206         return buf;
207 }
208 #endif /* SUNRPC_SVC_XPRT_H */
209 

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