include/linux/sunrpc/svc_xprt.h

   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 #include <linux/module.h>
  12
  13 struct svc_xprt_ops {
  14         struct svc_xprt *(*xpo_create)(struct svc_serv *,
  15                                        struct net *net,
  16                                        struct sockaddr *, int,
  17                                        int);
  18         struct svc_xprt *(*xpo_accept)(struct svc_xprt *);
  19         int             (*xpo_has_wspace)(struct svc_xprt *);
  20         int             (*xpo_recvfrom)(struct svc_rqst *);
  21         void            (*xpo_prep_reply_hdr)(struct svc_rqst *);
  22         int             (*xpo_sendto)(struct svc_rqst *);
  23         void            (*xpo_release_rqst)(struct svc_rqst *);
  24         void            (*xpo_detach)(struct svc_xprt *);
  25         void            (*xpo_free)(struct svc_xprt *);
  26 };
  27
  28 struct svc_xprt_class {
  29         const char              *xcl_name;
  30         struct module           *xcl_owner;
  31         struct svc_xprt_ops     *xcl_ops;
  32         struct list_head        xcl_list;
  33         u32                     xcl_max_payload;
  34 };
  35
  36 /*
  37  * This is embedded in an object that wants a callback before deleting
  38  * an xprt; intended for use by NFSv4.1, which needs to know when a
  39  * client's tcp connection (and hence possibly a backchannel) goes away.
  40  */
  41 struct svc_xpt_user {
  42         struct list_head list;
  43         void (*callback)(struct svc_xpt_user *);
  44 };
  45
  46 struct svc_xprt {
  47         struct svc_xprt_class   *xpt_class;
  48         struct svc_xprt_ops     *xpt_ops;
  49         struct kref             xpt_ref;
  50         struct list_head        xpt_list;
  51         struct list_head        xpt_ready;
  52         unsigned long           xpt_flags;
  53 #define XPT_BUSY        0               /* enqueued/receiving */
  54 #define XPT_CONN        1               /* conn pending */
  55 #define XPT_CLOSE       2               /* dead or dying */
  56 #define XPT_DATA        3               /* data pending */
  57 #define XPT_TEMP        4               /* connected transport */
  58 #define XPT_DEAD        6               /* transport closed */
  59 #define XPT_CHNGBUF     7               /* need to change snd/rcv buf sizes */
  60 #define XPT_DEFERRED    8               /* deferred request pending */
  61 #define XPT_OLD         9               /* used for xprt aging mark+sweep */
  62 #define XPT_DETACHED    10              /* detached from tempsocks list */
  63 #define XPT_LISTENER    11              /* listening endpoint */
  64 #define XPT_CACHE_AUTH  12              /* cache auth info */
  65
  66         struct svc_serv         *xpt_server;    /* service for transport */
  67         atomic_t                xpt_reserved;   /* space on outq that is rsvd */
  68         struct mutex            xpt_mutex;      /* to serialize sending data */
  69         spinlock_t              xpt_lock;       /* protects sk_deferred
  70                                                  * and xpt_auth_cache */
  71         void                    *xpt_auth_cache;/* auth cache */
  72         struct list_head        xpt_deferred;   /* deferred requests that need
  73                                                  * to be revisted */
  74         struct sockaddr_storage xpt_local;      /* local address */
  75         size_t                  xpt_locallen;   /* length of address */
  76         struct sockaddr_storage xpt_remote;     /* remote peer's address */
  77         size_t                  xpt_remotelen;  /* length of address */
  78         struct rpc_wait_queue   xpt_bc_pending; /* backchannel wait queue */
  79         struct list_head        xpt_users;      /* callbacks on free */
  80
  81         struct net              *xpt_net;
  82         struct rpc_xprt         *xpt_bc_xprt;   /* NFSv4.1 backchannel */
  83 };
  84
  85 static inline void unregister_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
  86 {
  87         spin_lock(&xpt->xpt_lock);
  88         list_del_init(&u->list);
  89         spin_unlock(&xpt->xpt_lock);
  90 }
  91
  92 static inline int register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
  93 {
  94         spin_lock(&xpt->xpt_lock);
  95         if (test_bit(XPT_CLOSE, &xpt->xpt_flags)) {
  96                 /*
  97                  * The connection is about to be deleted soon (or,
  98                  * worse, may already be deleted--in which case we've
  99                  * already notified the xpt_users).
 100                  */
 101                 spin_unlock(&xpt->xpt_lock);
 102                 return -ENOTCONN;
 103         }
 104         list_add(&u->list, &xpt->xpt_users);
 105         spin_unlock(&xpt->xpt_lock);
 106         return 0;
 107 }
 108
 109 int     svc_reg_xprt_class(struct svc_xprt_class *);
 110 void    svc_unreg_xprt_class(struct svc_xprt_class *);
 111 void    svc_xprt_init(struct svc_xprt_class *, struct svc_xprt *,
 112                       struct svc_serv *);
 113 int     svc_create_xprt(struct svc_serv *, const char *, struct net *,
 114                         const int, const unsigned short, int);
 115 void    svc_xprt_enqueue(struct svc_xprt *xprt);
 116 void    svc_xprt_received(struct svc_xprt *);
 117 void    svc_xprt_put(struct svc_xprt *xprt);
 118 void    svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt);
 119 void    svc_close_xprt(struct svc_xprt *xprt);
 120 void    svc_delete_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                         const sa_family_t af, const unsigned short port);
 125 int     svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen);
 126
 127 static inline void svc_xprt_get(struct svc_xprt *xprt)
 128 {
 129         kref_get(&xprt->xpt_ref);
 130 }
 131 static inline void svc_xprt_set_local(struct svc_xprt *xprt,
 132                                       const struct sockaddr *sa,
 133                                       const size_t salen)
 134 {
 135         memcpy(&xprt->xpt_local, sa, salen);
 136         xprt->xpt_locallen = salen;
 137 }
 138 static inline void svc_xprt_set_remote(struct svc_xprt *xprt,
 139                                        const struct sockaddr *sa,
 140                                        const size_t salen)
 141 {
 142         memcpy(&xprt->xpt_remote, sa, salen);
 143         xprt->xpt_remotelen = salen;
 144 }
 145 static inline unsigned short svc_addr_port(const struct sockaddr *sa)
 146 {
 147         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 148         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
 149
 150         switch (sa->sa_family) {
 151         case AF_INET:
 152                 return ntohs(sin->sin_port);
 153         case AF_INET6:
 154                 return ntohs(sin6->sin6_port);
 155         }
 156
 157         return 0;
 158 }
 159
 160 static inline size_t svc_addr_len(const struct sockaddr *sa)
 161 {
 162         switch (sa->sa_family) {
 163         case AF_INET:
 164                 return sizeof(struct sockaddr_in);
 165         case AF_INET6:
 166                 return sizeof(struct sockaddr_in6);
 167         }
 168
 169         return 0;
 170 }
 171
 172 static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
 173 {
 174         return svc_addr_port((const struct sockaddr *)&xprt->xpt_local);
 175 }
 176
 177 static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt)
 178 {
 179         return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote);
 180 }
 181
 182 static inline char *__svc_print_addr(const struct sockaddr *addr,
 183                                      char *buf, const size_t len)
 184 {
 185         const struct sockaddr_in *sin = (const struct sockaddr_in *)addr;
 186         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr;
 187
 188         switch (addr->sa_family) {
 189         case AF_INET:
 190                 snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr,
 191                         ntohs(sin->sin_port));
 192                 break;
 193
 194         case AF_INET6:
 195                 snprintf(buf, len, "%pI6, port=%u",
 196                          &sin6->sin6_addr,
 197                         ntohs(sin6->sin6_port));
 198                 break;
 199
 200         default:
 201                 snprintf(buf, len, "unknown address type: %d", addr->sa_family);
 202                 break;
 203         }
 204
 205         return buf;
 206 }
 207 #endif /* SUNRPC_SVC_XPRT_H */