LXR linux/include/linux/sunrpc/svc

   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
  13struct module;
  14
  15struct 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
  31struct 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 */
  45struct svc_xpt_user {
  46        struct list_head list;
  47        void (*callback)(struct svc_xpt_user *);
  48};
  49
  50struct 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        struct rpc_xprt         *xpt_bc_xprt;   /* NFSv4.1 backchannel */
  90        struct rpc_xprt_switch  *xpt_bc_xps;    /* NFSv4.1 backchannel */
  91};
  92
  93static inline void unregister_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
  94{
  95        spin_lock(&xpt->xpt_lock);
  96        list_del_init(&u->list);
  97        spin_unlock(&xpt->xpt_lock);
  98}
  99
 100static inline int register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
 101{
 102        spin_lock(&xpt->xpt_lock);
 103        if (test_bit(XPT_CLOSE, &xpt->xpt_flags)) {
 104                /*
 105                 * The connection is about to be deleted soon (or,
 106                 * worse, may already be deleted--in which case we've
 107                 * already notified the xpt_users).
 108                 */
 109                spin_unlock(&xpt->xpt_lock);
 110                return -ENOTCONN;
 111        }
 112        list_add(&u->list, &xpt->xpt_users);
 113        spin_unlock(&xpt->xpt_lock);
 114        return 0;
 115}
 116
 117int     svc_reg_xprt_class(struct svc_xprt_class *);
 118void    svc_unreg_xprt_class(struct svc_xprt_class *);
 119void    svc_xprt_init(struct net *, struct svc_xprt_class *, struct svc_xprt *,
 120                      struct svc_serv *);
 121int     svc_create_xprt(struct svc_serv *, const char *, struct net *,
 122                        const int, const unsigned short, int);
 123void    svc_xprt_do_enqueue(struct svc_xprt *xprt);
 124void    svc_xprt_enqueue(struct svc_xprt *xprt);
 125void    svc_xprt_put(struct svc_xprt *xprt);
 126void    svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt);
 127void    svc_close_xprt(struct svc_xprt *xprt);
 128int     svc_port_is_privileged(struct sockaddr *sin);
 129int     svc_print_xprts(char *buf, int maxlen);
 130struct  svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
 131                        struct net *net, const sa_family_t af,
 132                        const unsigned short port);
 133int     svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen);
 134void    svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *xprt);
 135void    svc_age_temp_xprts_now(struct svc_serv *, struct sockaddr *);
 136
 137static inline void svc_xprt_get(struct svc_xprt *xprt)
 138{
 139        kref_get(&xprt->xpt_ref);
 140}
 141static inline void svc_xprt_set_local(struct svc_xprt *xprt,
 142                                      const struct sockaddr *sa,
 143                                      const size_t salen)
 144{
 145        memcpy(&xprt->xpt_local, sa, salen);
 146        xprt->xpt_locallen = salen;
 147}
 148static inline void svc_xprt_set_remote(struct svc_xprt *xprt,
 149                                       const struct sockaddr *sa,
 150                                       const size_t salen)
 151{
 152        memcpy(&xprt->xpt_remote, sa, salen);
 153        xprt->xpt_remotelen = salen;
 154        snprintf(xprt->xpt_remotebuf, sizeof(xprt->xpt_remotebuf) - 1,
 155                 "%pISpc", sa);
 156}
 157
 158static inline unsigned short svc_addr_port(const struct sockaddr *sa)
 159{
 160        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 161        const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
 162
 163        switch (sa->sa_family) {
 164        case AF_INET:
 165                return ntohs(sin->sin_port);
 166        case AF_INET6:
 167                return ntohs(sin6->sin6_port);
 168        }
 169
 170        return 0;
 171}
 172
 173static inline size_t svc_addr_len(const struct sockaddr *sa)
 174{
 175        switch (sa->sa_family) {
 176        case AF_INET:
 177                return sizeof(struct sockaddr_in);
 178        case AF_INET6:
 179                return sizeof(struct sockaddr_in6);
 180        }
 181        BUG();
 182}
 183
 184static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
 185{
 186        return svc_addr_port((const struct sockaddr *)&xprt->xpt_local);
 187}
 188
 189static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt)
 190{
 191        return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote);
 192}
 193
 194static inline char *__svc_print_addr(const struct sockaddr *addr,
 195                                     char *buf, const size_t len)
 196{
 197        const struct sockaddr_in *sin = (const struct sockaddr_in *)addr;
 198        const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr;
 199
 200        switch (addr->sa_family) {
 201        case AF_INET:
 202                snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr,
 203                        ntohs(sin->sin_port));
 204                break;
 205
 206        case AF_INET6:
 207                snprintf(buf, len, "%pI6, port=%u",
 208                         &sin6->sin6_addr,
 209                        ntohs(sin6->sin6_port));
 210                break;
 211
 212        default:
 213                snprintf(buf, len, "unknown address type: %d", addr->sa_family);
 214                break;
 215        }
 216
 217        return buf;
 218}
 219#endif /* SUNRPC_SVC_XPRT_H */
 220