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
  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         void            (*xpo_adjust_wspace)(struct svc_xprt *);
  29 };
  30
  31 struct svc_xprt_class {
  32         const char              *xcl_name;
  33         struct module           *xcl_owner;
  34         struct svc_xprt_ops     *xcl_ops;
  35         struct list_head        xcl_list;
  36         u32                     xcl_max_payload;
  37         int                     xcl_ident;
  38 };
  39
  40 /*
  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.
  44  */
  45 struct svc_xpt_user {
  46         struct list_head list;
  47         void (*callback)(struct svc_xpt_user *);
  48 };
  49
  50 struct svc_xprt {
  51         struct svc_xprt_class   *xpt_class;
  52         struct svc_xprt_ops     *xpt_ops;
  53         struct kref             xpt_ref;
  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
  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_do_enqueue(struct svc_xprt *xprt);
 120 void    svc_xprt_enqueue(struct svc_xprt *xprt);
 121 void    svc_xprt_put(struct svc_xprt *xprt);
 122 void    svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt);
 123 void    svc_close_xprt(struct svc_xprt *xprt);
 124 int     svc_port_is_privileged(struct sockaddr *sin);
 125 int     svc_print_xprts(char *buf, int maxlen);
 126 struct  svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
 127                         struct net *net, const sa_family_t af,
 128                         const unsigned short port);
 129 int     svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen);
 130 void    svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *xprt);
 131 void    svc_age_temp_xprts_now(struct svc_serv *, struct sockaddr *);
 132
 133 static inline void svc_xprt_get(struct svc_xprt *xprt)
 134 {
 135         kref_get(&xprt->xpt_ref);
 136 }
 137 static inline void svc_xprt_set_local(struct svc_xprt *xprt,
 138                                       const struct sockaddr *sa,
 139                                       const size_t salen)
 140 {
 141         memcpy(&xprt->xpt_local, sa, salen);
 142         xprt->xpt_locallen = salen;
 143 }
 144 static inline void svc_xprt_set_remote(struct svc_xprt *xprt,
 145                                        const struct sockaddr *sa,
 146                                        const size_t salen)
 147 {
 148         memcpy(&xprt->xpt_remote, sa, salen);
 149         xprt->xpt_remotelen = salen;
 150 }
 151 static inline unsigned short svc_addr_port(const struct sockaddr *sa)
 152 {
 153         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 154         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
 155
 156         switch (sa->sa_family) {
 157         case AF_INET:
 158                 return ntohs(sin->sin_port);
 159         case AF_INET6:
 160                 return ntohs(sin6->sin6_port);
 161         }
 162
 163         return 0;
 164 }
 165
 166 static inline size_t svc_addr_len(const struct sockaddr *sa)
 167 {
 168         switch (sa->sa_family) {
 169         case AF_INET:
 170                 return sizeof(struct sockaddr_in);
 171         case AF_INET6:
 172                 return sizeof(struct sockaddr_in6);
 173         }
 174         BUG();
 175 }
 176
 177 static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
 178 {
 179         return svc_addr_port((const struct sockaddr *)&xprt->xpt_local);
 180 }
 181
 182 static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt)
 183 {
 184         return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote);
 185 }
 186
 187 static inline char *__svc_print_addr(const struct sockaddr *addr,
 188                                      char *buf, const size_t len)
 189 {
 190         const struct sockaddr_in *sin = (const struct sockaddr_in *)addr;
 191         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr;
 192
 193         switch (addr->sa_family) {
 194         case AF_INET:
 195                 snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr,
 196                         ntohs(sin->sin_port));
 197                 break;
 198
 199         case AF_INET6:
 200                 snprintf(buf, len, "%pI6, port=%u",
 201                          &sin6->sin6_addr,
 202                         ntohs(sin6->sin6_port));
 203                 break;
 204
 205         default:
 206                 snprintf(buf, len, "unknown address type: %d", addr->sa_family);
 207                 break;
 208         }
 209
 210         return buf;
 211 }
 212 #endif /* SUNRPC_SVC_XPRT_H */