root/include/linux/sunrpc/svc_xprt.h

INCLUDED FROM

DEFINITIONS

1. unregister_xpt_user
2. register_xpt_user
3. svc_xprt_get
4. svc_xprt_set_local
5. svc_xprt_set_remote
6. svc_addr_port
7. svc_addr_len
8. svc_xprt_local_port
9. svc_xprt_remote_port
10. __svc_print_addr

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * linux/include/linux/sunrpc/svc_xprt.h
   4  *
   5  * RPC server transport I/O
   6  */
   7 
   8 #ifndef SUNRPC_SVC_XPRT_H
   9 #define SUNRPC_SVC_XPRT_H
  10 
  11 #include <linux/sunrpc/svc.h>
  12 
  13 struct module;
  14 
  15 struct svc_xprt_ops {
  16         struct svc_xprt *(*xpo_create)(struct svc_serv *,
  17                                        struct net *net,
  18                                        struct sockaddr *, int,
  19                                        int);
  20         struct svc_xprt *(*xpo_accept)(struct svc_xprt *);
  21         int             (*xpo_has_wspace)(struct svc_xprt *);
  22         int             (*xpo_recvfrom)(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         void            (*xpo_secure_port)(struct svc_rqst *rqstp);
  28         void            (*xpo_kill_temp_xprt)(struct svc_xprt *);
  29 };
  30 
  31 struct svc_xprt_class {
  32         const char              *xcl_name;
  33         struct module           *xcl_owner;
  34         const 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         const 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 #define XPT_KILL_TEMP   13              /* call xpo_kill_temp_xprt before closing */
  70 #define XPT_CONG_CTRL   14              /* has congestion control */
  71 
  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
  80                                                  * to be revisted */
  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         char                    xpt_remotebuf[INET6_ADDRSTRLEN + 10];
  86         struct list_head        xpt_users;      /* callbacks on free */
  87 
  88         struct net              *xpt_net;
  89         const struct cred       *xpt_cred;
  90         struct rpc_xprt         *xpt_bc_xprt;   /* NFSv4.1 backchannel */
  91         struct rpc_xprt_switch  *xpt_bc_xps;    /* NFSv4.1 backchannel */
  92 };
  93 
  94 static inline void unregister_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
  95 {
  96         spin_lock(&xpt->xpt_lock);
  97         list_del_init(&u->list);
  98         spin_unlock(&xpt->xpt_lock);
  99 }
 100 
 101 static inline int register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
 102 {
 103         spin_lock(&xpt->xpt_lock);
 104         if (test_bit(XPT_CLOSE, &xpt->xpt_flags)) {
 105                 /*
 106                  * The connection is about to be deleted soon (or,
 107                  * worse, may already be deleted--in which case we've
 108                  * already notified the xpt_users).
 109                  */
 110                 spin_unlock(&xpt->xpt_lock);
 111                 return -ENOTCONN;
 112         }
 113         list_add(&u->list, &xpt->xpt_users);
 114         spin_unlock(&xpt->xpt_lock);
 115         return 0;
 116 }
 117 
 118 int     svc_reg_xprt_class(struct svc_xprt_class *);
 119 void    svc_unreg_xprt_class(struct svc_xprt_class *);
 120 void    svc_xprt_init(struct net *, struct svc_xprt_class *, struct svc_xprt *,
 121                       struct svc_serv *);
 122 int     svc_create_xprt(struct svc_serv *, const char *, struct net *,
 123                         const int, const unsigned short, int,
 124                         const struct cred *);
 125 void    svc_xprt_do_enqueue(struct svc_xprt *xprt);
 126 void    svc_xprt_enqueue(struct svc_xprt *xprt);
 127 void    svc_xprt_put(struct svc_xprt *xprt);
 128 void    svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt);
 129 void    svc_close_xprt(struct svc_xprt *xprt);
 130 int     svc_port_is_privileged(struct sockaddr *sin);
 131 int     svc_print_xprts(char *buf, int maxlen);
 132 struct  svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
 133                         struct net *net, const sa_family_t af,
 134                         const unsigned short port);
 135 int     svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen);
 136 void    svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *xprt);
 137 void    svc_age_temp_xprts_now(struct svc_serv *, struct sockaddr *);
 138 
 139 static inline void svc_xprt_get(struct svc_xprt *xprt)
 140 {
 141         kref_get(&xprt->xpt_ref);
 142 }
 143 static inline void svc_xprt_set_local(struct svc_xprt *xprt,
 144                                       const struct sockaddr *sa,
 145                                       const size_t salen)
 146 {
 147         memcpy(&xprt->xpt_local, sa, salen);
 148         xprt->xpt_locallen = salen;
 149 }
 150 static inline void svc_xprt_set_remote(struct svc_xprt *xprt,
 151                                        const struct sockaddr *sa,
 152                                        const size_t salen)
 153 {
 154         memcpy(&xprt->xpt_remote, sa, salen);
 155         xprt->xpt_remotelen = salen;
 156         snprintf(xprt->xpt_remotebuf, sizeof(xprt->xpt_remotebuf) - 1,
 157                  "%pISpc", sa);
 158 }
 159 
 160 static inline unsigned short svc_addr_port(const struct sockaddr *sa)
 161 {
 162         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 163         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
 164 
 165         switch (sa->sa_family) {
 166         case AF_INET:
 167                 return ntohs(sin->sin_port);
 168         case AF_INET6:
 169                 return ntohs(sin6->sin6_port);
 170         }
 171 
 172         return 0;
 173 }
 174 
 175 static inline size_t svc_addr_len(const struct sockaddr *sa)
 176 {
 177         switch (sa->sa_family) {
 178         case AF_INET:
 179                 return sizeof(struct sockaddr_in);
 180         case AF_INET6:
 181                 return sizeof(struct sockaddr_in6);
 182         }
 183         BUG();
 184 }
 185 
 186 static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
 187 {
 188         return svc_addr_port((const struct sockaddr *)&xprt->xpt_local);
 189 }
 190 
 191 static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt)
 192 {
 193         return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote);
 194 }
 195 
 196 static inline char *__svc_print_addr(const struct sockaddr *addr,
 197                                      char *buf, const size_t len)
 198 {
 199         const struct sockaddr_in *sin = (const struct sockaddr_in *)addr;
 200         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr;
 201 
 202         switch (addr->sa_family) {
 203         case AF_INET:
 204                 snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr,
 205                         ntohs(sin->sin_port));
 206                 break;
 207 
 208         case AF_INET6:
 209                 snprintf(buf, len, "%pI6, port=%u",
 210                          &sin6->sin6_addr,
 211                         ntohs(sin6->sin6_port));
 212                 break;
 213 
 214         default:
 215                 snprintf(buf, len, "unknown address type: %d", addr->sa_family);
 216                 break;
 217         }
 218 
 219         return buf;
 220 }
 221 #endif /* SUNRPC_SVC_XPRT_H */