/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Definitions for the AF_INET socket handler. * * Version: @(#)sock.h 1.0.4 05/13/93 * * Authors: Ross Biro, * Fred N. van Kempen, * Corey Minyard * Florian La Roche * * Fixes: * Alan Cox : Volatiles in skbuff pointers. See * skbuff comments. May be overdone, * better to prove they can be removed * than the reverse. * Alan Cox : Added a zapped field for tcp to note * a socket is reset and must stay shut up * Alan Cox : New fields for options * Pauline Middelink : identd support * Alan Cox : Eliminate low level recv/recvfrom * David S. Miller : New socket lookup architecture. * Steve Whitehouse: Default routines for sock_ops * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _SOCK_H #define _SOCK_H #include #include #include /* struct sockaddr_in */ #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) #include /* struct sockaddr_in6 */ #include /* dest_cache, inet6_options */ #include #include /* struct ipv6_mc_socklist */ #endif #if defined(CONFIG_INET) || defined (CONFIG_INET_MODULE) #include #endif #include /* struct tcphdr */ #include #include /* struct sk_buff */ #include /* struct inet_protocol */ #if defined(CONFIG_X25) || defined(CONFIG_X25_MODULE) #include #endif #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) #include #if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE) #include #endif #if defined(CONFIG_ROSE) || defined(CONFIG_ROSE_MODULE) #include #endif #endif #if defined(CONFIG_IPX) || defined(CONFIG_IPX_MODULE) #if defined(CONFIG_SPX) || defined(CONFIG_SPX_MODULE) #include #else #include #endif /* CONFIG_SPX */ #endif /* CONFIG_IPX */ #if defined(CONFIG_ATALK) || defined(CONFIG_ATALK_MODULE) #include #endif #if defined(CONFIG_DECNET) || defined(CONFIG_DECNET_MODULE) #include #endif #ifdef CONFIG_FILTER #include #endif #include /* The AF_UNIX specific socket options */ struct unix_opt { int family; char * name; int locks; struct unix_address *addr; struct dentry * dentry; struct semaphore readsem; struct sock * other; struct sock ** list; int marksweep; #define MARKED 1 int inflight; }; #ifdef CONFIG_NETLINK struct netlink_callback; struct netlink_opt { pid_t pid; unsigned groups; pid_t dst_pid; unsigned dst_groups; int (*handler)(int unit, struct sk_buff *skb); atomic_t locks; struct netlink_callback *cb; }; #endif /* Once the IPX ncpd patches are in these are going into protinfo. */ #if defined(CONFIG_IPX) || defined(CONFIG_IPX_MODULE) struct ipx_opt { ipx_address dest_addr; ipx_interface *intrfc; unsigned short port; #ifdef CONFIG_IPX_INTERN unsigned char node[IPX_NODE_LEN]; #endif unsigned short type; }; #endif #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) struct ipv6_pinfo { struct in6_addr saddr; struct in6_addr rcv_saddr; struct in6_addr daddr; __u32 flow_lbl; int hop_limit; int mcast_hops; int mcast_oif; __u8 priority; /* sockopt flags */ __u8 recvsrcrt:1, rxinfo:1, rxhlim:1, hopopts:1, dstopts:1, mc_loop:1, unused:2; struct ipv6_mc_socklist *ipv6_mc_list; __u32 dst_cookie; struct ipv6_options *opt; }; struct raw6_opt { __u32 checksum; /* perform checksum */ __u32 offset; /* checksum offset */ struct icmp6_filter filter; }; #endif /* IPV6 */ #if defined(CONFIG_INET) || defined(CONFIG_INET_MODULE) struct raw_opt { struct icmp_filter filter; }; #endif /* This defines a selective acknowledgement block. */ struct tcp_sack_block { __u32 start_seq; __u32 end_seq; }; struct tcp_opt { int tcp_header_len; /* Bytes of tcp header to send */ /* * Header prediction flags * 0x5?10 << 16 + snd_wnd in net byte order */ __u32 pred_flags; /* * RFC793 variables by their proper names. This means you can * read the code and the spec side by side (and laugh ...) * See RFC793 and RFC1122. The RFC writes these in capitals. */ __u32 rcv_nxt; /* What we want to receive next */ __u32 snd_nxt; /* Next sequence we send */ __u32 snd_una; /* First byte we want an ack for */ __u32 rcv_tstamp; /* timestamp of last received packet */ __u32 lrcvtime; /* timestamp of last received data packet*/ __u32 srtt; /* smothed round trip time << 3 */ __u32 ato; /* delayed ack timeout */ __u32 snd_wl1; /* Sequence for window update */ __u32 snd_wl2; /* Ack sequence for update */ __u32 snd_wnd; /* The window we expect to receive */ __u32 max_window; __u8 pending; /* pending events */ __u8 retransmits; __u32 last_ack_sent; /* last ack we sent */ __u32 backoff; /* backoff */ __u32 mdev; /* medium deviation */ __u32 snd_cwnd; /* Sending congestion window */ __u32 rto; /* retransmit timeout */ __u32 packets_out; /* Packets which are "in flight" */ __u32 fackets_out; /* Non-retrans SACK'd packets */ __u32 retrans_out; /* Fast-retransmitted packets out */ __u32 high_seq; /* snd_nxt at onset of congestion */ /* * Slow start and congestion control (see also Nagle, and Karn & Partridge) */ __u32 snd_ssthresh; /* Slow start size threshold */ __u8 dup_acks; /* Consequetive duplicate acks seen from other end */ __u8 delayed_acks; /* Two commonly used timers in both sender and receiver paths. */ struct timer_list retransmit_timer; /* Resend (no ack) */ struct timer_list delack_timer; /* Ack delay */ struct sk_buff_head out_of_order_queue; /* Out of order segments go here */ struct tcp_func *af_specific; /* Operations which are AF_INET{4,6} specific */ struct sk_buff *send_head; /* Front of stuff to transmit */ struct sk_buff *retrans_head; /* retrans head can be * different to the head of * write queue if we are doing * fast retransmit */ __u32 rcv_wnd; /* Current receiver window */ __u32 rcv_wup; /* rcv_nxt on last window update sent */ __u32 write_seq; __u32 copied_seq; /* * Options received (usually on last packet, some only on SYN packets). */ char tstamp_ok, /* TIMESTAMP seen on SYN packet */ wscale_ok, /* Wscale seen on SYN packet */ sack_ok; /* SACK seen on SYN packet */ char saw_tstamp; /* Saw TIMESTAMP on last packet */ __u16 in_mss; /* MSS option received from sender */ __u8 snd_wscale; /* Window scaling received from sender */ __u8 rcv_wscale; /* Window scaling to send to receiver */ __u32 rcv_tsval; /* Time stamp value */ __u32 rcv_tsecr; /* Time stamp echo reply */ __u32 ts_recent; /* Time stamp to echo next */ __u32 ts_recent_stamp;/* Time we stored ts_recent (for aging) */ int num_sacks; /* Number of SACK blocks */ struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/ struct timer_list probe_timer; /* Probes */ __u32 window_clamp; /* XXX Document this... -DaveM */ __u32 probes_out; /* unanswered 0 window probes */ __u32 syn_seq; __u32 fin_seq; __u32 urg_seq; __u32 urg_data; struct open_request *syn_wait_queue; struct open_request **syn_wait_last; int syn_backlog; /* Backlog of received SYNs */ }; /* * This structure really needs to be cleaned up. * Most of it is for TCP, and not used by any of * the other protocols. */ /* * The idea is to start moving to a newer struct gradualy * * IMHO the newer struct should have the following format: * * struct sock { * sockmem [mem, proto, callbacks] * * union or struct { * ax25; * } ll_pinfo; * * union { * ipv4; * ipv6; * ipx; * netrom; * rose; * x25; * } net_pinfo; * * union { * tcp; * udp; * spx; * netrom; * } tp_pinfo; * * } */ /* Define this to get the sk->debug debugging facility. */ #define SOCK_DEBUGGING #ifdef SOCK_DEBUGGING #define SOCK_DEBUG(sk, msg...) do { if((sk) && ((sk)->debug)) printk(KERN_DEBUG ## msg); } while (0) #else #define SOCK_DEBUG(sk, msg...) do { } while (0) #endif struct sock { /* This must be first. */ struct sock *sklist_next; struct sock *sklist_prev; /* Local port binding hash linkage. */ struct sock *bind_next; struct sock **bind_pprev; /* Socket demultiplex comparisons on incoming packets. */ __u32 daddr; /* Foreign IPv4 addr */ __u32 rcv_saddr; /* Bound local IPv4 addr */ __u16 dport; /* Destination port */ unsigned short num; /* Local port */ int bound_dev_if; /* Bound device index if != 0 */ /* Main hash linkage for various protocol lookup tables. */ struct sock *next; struct sock **pprev; volatile unsigned char state, /* Connection state */ zapped; /* In ax25 & ipx means not linked */ __u16 sport; /* Source port */ unsigned short family; /* Address family */ unsigned char reuse, /* SO_REUSEADDR setting */ nonagle; /* Disable Nagle algorithm? */ int sock_readers; /* User count */ int rcvbuf; /* Size of receive buffer in bytes */ struct wait_queue **sleep; /* Sock wait queue */ struct dst_entry *dst_cache; /* Destination cache */ atomic_t rmem_alloc; /* Receive queue bytes committed */ struct sk_buff_head receive_queue; /* Incoming packets */ atomic_t wmem_alloc; /* Transmit queue bytes committed */ struct sk_buff_head write_queue; /* Packet sending queue */ atomic_t omem_alloc; /* "o" is "option" or "other" */ __u32 saddr; /* Sending source */ unsigned int allocation; /* Allocation mode */ int sndbuf; /* Size of send buffer in bytes */ struct sock *prev; /* Not all are volatile, but some are, so we might as well say they all are. * XXX Make this a flag word -DaveM */ volatile char dead, done, urginline, keepopen, linger, destroy, no_check, broadcast, bsdism; unsigned char debug; int proc; unsigned long lingertime; int hashent; struct sock *pair; /* Error and backlog packet queues, rarely used. */ struct sk_buff_head back_log, error_queue; struct proto *prot; /* mss is min(mtu, max_window) * XXX Fix this, mtu only used in one TCP place and that is it -DaveM */ unsigned short mtu; /* mss negotiated in the syn's */ unsigned short mss; /* current eff. mss - can change */ unsigned short user_mss; /* mss requested by user in ioctl */ unsigned short shutdown; #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) union { struct ipv6_pinfo af_inet6; } net_pinfo; #endif union { struct tcp_opt af_tcp; #if defined(CONFIG_INET) || defined (CONFIG_INET_MODULE) struct raw_opt tp_raw4; #endif #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) struct raw6_opt tp_raw; #endif /* CONFIG_IPV6 */ #if defined(CONFIG_SPX) || defined (CONFIG_SPX_MODULE) struct spx_opt af_spx; #endif /* CONFIG_SPX */ } tp_pinfo; int err, err_soft; /* Soft holds errors that don't cause failure but are the cause of a persistent failure not just 'timed out' */ unsigned short ack_backlog; unsigned short max_ack_backlog; __u32 priority; unsigned short type; unsigned char localroute; /* Route locally only */ unsigned char protocol; struct ucred peercred; #ifdef CONFIG_FILTER /* Socket Filtering Instructions */ int filter; struct sock_filter *filter_data; #endif /* CONFIG_FILTER */ /* This is where all the private (optional) areas that don't * overlap will eventually live. */ union { void *destruct_hook; struct unix_opt af_unix; #if defined(CONFIG_ATALK) || defined(CONFIG_ATALK_MODULE) struct atalk_sock af_at; #endif #if defined(CONFIG_IPX) || defined(CONFIG_IPX_MODULE) struct ipx_opt af_ipx; #endif #if defined (CONFIG_DECNET) || defined(CONFIG_DECNET_MODULE) struct dn_scp dn; #endif #if defined (CONFIG_PACKET) || defined(CONFIG_PACKET_MODULE) struct packet_opt *af_packet; #endif #if defined(CONFIG_X25) || defined(CONFIG_X25_MODULE) x25_cb *x25; #endif #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) ax25_cb *ax25; #endif #if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE) nr_cb *nr; #endif #if defined(CONFIG_ROSE) || defined(CONFIG_ROSE_MODULE) rose_cb *rose; #endif #ifdef CONFIG_NETLINK struct netlink_opt af_netlink; #endif #if defined(CONFIG_ECONET) || defined(CONFIG_ECONET_MODULE) struct econet_opt *af_econet; #endif } protinfo; /* IP 'private area' or will be eventually. */ int ip_ttl; /* TTL setting */ int ip_tos; /* TOS */ unsigned ip_cmsg_flags; struct ip_options *opt; unsigned char ip_hdrincl; /* Include headers ? */ __u8 ip_mc_ttl; /* Multicasting TTL */ __u8 ip_mc_loop; /* Loopback */ __u8 ip_recverr; __u8 ip_pmtudisc; int ip_mc_index; /* Multicast device index */ __u32 ip_mc_addr; struct ip_mc_socklist *ip_mc_list; /* Group array */ /* This part is used for the timeout functions (timer.c). */ int timeout; /* What are we waiting for? */ struct timer_list timer; /* This is the sock cleanup timer. */ struct timeval stamp; /* Identd */ struct socket *socket; /* RPC layer private data */ void *user_data; /* Callbacks */ void (*state_change)(struct sock *sk); void (*data_ready)(struct sock *sk,int bytes); void (*write_space)(struct sock *sk); void (*error_report)(struct sock *sk); int (*backlog_rcv) (struct sock *sk, struct sk_buff *skb); void (*destruct)(struct sock *sk); }; /* IP protocol blocks we attach to sockets. * socket layer -> transport layer interface * transport -> network interface is defined by struct inet_proto */ struct proto { /* These must be first. */ struct sock *sklist_next; struct sock *sklist_prev; void (*close)(struct sock *sk, unsigned long timeout); int (*connect)(struct sock *sk, struct sockaddr *uaddr, int addr_len); struct sock * (*accept) (struct sock *sk, int flags); void (*retransmit)(struct sock *sk, int all); void (*write_wakeup)(struct sock *sk); void (*read_wakeup)(struct sock *sk); unsigned int (*poll)(struct file * file, struct socket *sock, struct poll_table_struct *wait); int (*ioctl)(struct sock *sk, int cmd, unsigned long arg); int (*init)(struct sock *sk); int (*destroy)(struct sock *sk); void (*shutdown)(struct sock *sk, int how); int (*setsockopt)(struct sock *sk, int level, int optname, char *optval, int optlen); int (*getsockopt)(struct sock *sk, int level, int optname, char *optval, int *option); int (*sendmsg)(struct sock *sk, struct msghdr *msg, int len); int (*recvmsg)(struct sock *sk, struct msghdr *msg, int len, int noblock, int flags, int *addr_len); int (*bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len); int (*backlog_rcv) (struct sock *sk, struct sk_buff *skb); /* Keeping track of sk's, looking them up, and port selection methods. */ void (*hash)(struct sock *sk); void (*unhash)(struct sock *sk); void (*rehash)(struct sock *sk); unsigned short (*good_socknum)(void); int (*verify_bind)(struct sock *sk, unsigned short snum); unsigned short max_header; unsigned long retransmits; char name[32]; int inuse, highestinuse; }; #define TIME_WRITE 1 /* Not yet used */ #define TIME_RETRANS 2 /* Retransmit timer */ #define TIME_DACK 3 /* Delayed ack timer */ #define TIME_CLOSE 4 #define TIME_KEEPOPEN 5 #define TIME_DESTROY 6 #define TIME_DONE 7 /* Used to absorb those last few packets */ #define TIME_PROBE0 8 /* About 10 seconds */ #define SOCK_DESTROY_TIME (10*HZ) /* Sockets 0-1023 can't be bound to unless you are superuser */ #define PROT_SOCK 1024 #define SHUTDOWN_MASK 3 #define RCV_SHUTDOWN 1 #define SEND_SHUTDOWN 2 /* Per-protocol hash table implementations use this to make sure * nothing changes. */ #define SOCKHASH_LOCK() start_bh_atomic() #define SOCKHASH_UNLOCK() end_bh_atomic() /* Some things in the kernel just want to get at a protocols * entire socket list commensurate, thus... */ static __inline__ void add_to_prot_sklist(struct sock *sk) { SOCKHASH_LOCK(); if(!sk->sklist_next) { struct proto *p = sk->prot; sk->sklist_prev = (struct sock *) p; sk->sklist_next = p->sklist_next; p->sklist_next->sklist_prev = sk; p->sklist_next = sk; /* Charge the protocol. */ sk->prot->inuse += 1; if(sk->prot->highestinuse < sk->prot->inuse) sk->prot->highestinuse = sk->prot->inuse; } SOCKHASH_UNLOCK(); } static __inline__ void del_from_prot_sklist(struct sock *sk) { SOCKHASH_LOCK(); if(sk->sklist_next) { sk->sklist_next->sklist_prev = sk->sklist_prev; sk->sklist_prev->sklist_next = sk->sklist_next; sk->sklist_next = NULL; sk->prot->inuse--; } SOCKHASH_UNLOCK(); } /* * Used by processes to "lock" a socket state, so that * interrupts and bottom half handlers won't change it * from under us. It essentially blocks any incoming * packets, so that we won't get any new data or any * packets that change the state of the socket. * * Note the 'barrier()' calls: gcc may not move a lock * "downwards" or a unlock "upwards" when optimizing. */ extern void __release_sock(struct sock *sk); static inline void lock_sock(struct sock *sk) { #if 0 /* debugging code: the test isn't even 100% correct, but it can catch bugs */ /* Note that a double lock is ok in theory - it's just _usually_ a bug */ if (sk->sock_readers) { __label__ here; printk("double lock on socket at %p\n", &&here); here: } #endif #ifdef __SMP__ /* * This is a very broken bottom half synchronization mechanism. * You don't want to know.. */ { unsigned long flags; save_flags(flags); cli(); sk->sock_readers++; restore_flags(flags); } #else sk->sock_readers++; barrier(); #endif } static inline void release_sock(struct sock *sk) { barrier(); #if 0 /* debugging code: remove me when ok */ if (sk->sock_readers == 0) { __label__ here; sk->sock_readers = 1; printk("trying to unlock unlocked socket at %p\n", &&here); here: } #endif if ((sk->sock_readers = sk->sock_readers-1) == 0) __release_sock(sk); } /* * This might not be the most appropriate place for this two * but since they are used by a lot of the net related code * at least they get declared on a include that is common to all */ static __inline__ int min(unsigned int a, unsigned int b) { if (a > b) a = b; return a; } static __inline__ int max(unsigned int a, unsigned int b) { if (a < b) a = b; return a; } extern struct sock * sk_alloc(int family, int priority, int zero_it); extern void sk_free(struct sock *sk); extern void destroy_sock(struct sock *sk); extern struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, int priority); extern struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, int priority); extern void sock_wfree(struct sk_buff *skb); extern void sock_rfree(struct sk_buff *skb); extern unsigned long sock_rspace(struct sock *sk); extern unsigned long sock_wspace(struct sock *sk); extern int sock_setsockopt(struct socket *sock, int level, int op, char *optval, int optlen); extern int sock_getsockopt(struct socket *sock, int level, int op, char *optval, int *optlen); extern struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, unsigned long fallback, int noblock, int *errcode); extern void *sock_kmalloc(struct sock *sk, int size, int priority); extern void sock_kfree_s(struct sock *sk, void *mem, int size); /* * Functions to fill in entries in struct proto_ops when a protocol * does not implement a particular function. */ extern int sock_no_dup(struct socket *, struct socket *); extern int sock_no_release(struct socket *, struct socket *); extern int sock_no_bind(struct socket *, struct sockaddr *, int); extern int sock_no_connect(struct socket *, struct sockaddr *, int, int); extern int sock_no_socketpair(struct socket *, struct socket *); extern int sock_no_accept(struct socket *, struct socket *, int); extern int sock_no_getname(struct socket *, struct sockaddr *, int *, int); extern unsigned int sock_no_poll(struct file *, struct socket *, struct poll_table_struct *); extern int sock_no_ioctl(struct socket *, unsigned int, unsigned long); extern int sock_no_listen(struct socket *, int); extern int sock_no_shutdown(struct socket *, int); extern int sock_no_getsockopt(struct socket *, int , int, char *, int *); extern int sock_no_setsockopt(struct socket *, int, int, char *, int); extern int sock_no_fcntl(struct socket *, unsigned int, unsigned long); extern int sock_no_sendmsg(struct socket *, struct msghdr *, int, struct scm_cookie *); extern int sock_no_recvmsg(struct socket *, struct msghdr *, int, struct scm_cookie *); /* * Default socket callbacks and setup code */ extern void sock_def_callback1(struct sock *); extern void sock_def_callback2(struct sock *, int); extern void sock_def_callback3(struct sock *); extern void sock_def_destruct(struct sock *); /* Initialise core socket variables */ extern void sock_init_data(struct socket *sock, struct sock *sk); extern void sklist_remove_socket(struct sock **list, struct sock *sk); extern void sklist_insert_socket(struct sock **list, struct sock *sk); extern void sklist_destroy_socket(struct sock **list, struct sock *sk); #ifdef CONFIG_FILTER /* * Run the filter code and then cut skb->data to correct size returned by * sk_run_filter. If pkt_len is 0 we toss packet. If skb->len is smaller * than pkt_len we keep whole skb->data. */ extern __inline__ int sk_filter(struct sk_buff *skb, struct sock_filter *filter, int flen) { int pkt_len; pkt_len = sk_run_filter(skb->data, skb->len, filter, flen); if(!pkt_len) return 1; /* Toss Packet */ else skb_trim(skb, pkt_len); return 0; } #endif /* CONFIG_FILTER */ /* * Queue a received datagram if it will fit. Stream and sequenced * protocols can't normally use this as they need to fit buffers in * and play with them. * * Inlined as it's very short and called for pretty much every * packet ever received. */ extern __inline__ void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) { skb->sk = sk; skb->destructor = sock_wfree; atomic_add(skb->truesize, &sk->wmem_alloc); } extern __inline__ void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) { skb->sk = sk; skb->destructor = sock_rfree; atomic_add(skb->truesize, &sk->rmem_alloc); } extern __inline__ int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) { /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces number of warnings when compiling with -W --ANK */ if (atomic_read(&sk->rmem_alloc) + skb->truesize >= (unsigned)sk->rcvbuf) return -ENOMEM; #ifdef CONFIG_FILTER if (sk->filter) { if (sk_filter(skb, sk->filter_data, sk->filter)) return -EPERM; /* Toss packet */ } #endif /* CONFIG_FILTER */ skb_set_owner_r(skb, sk); skb_queue_tail(&sk->receive_queue, skb); if (!sk->dead) sk->data_ready(sk,skb->len); return 0; } extern __inline__ int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) { /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces number of warnings when compiling with -W --ANK */ if (atomic_read(&sk->rmem_alloc) + skb->truesize >= (unsigned)sk->rcvbuf) return -ENOMEM; skb_set_owner_r(skb, sk); __skb_queue_tail(&sk->receive_queue,skb); if (!sk->dead) sk->data_ready(sk,skb->len); return 0; } extern __inline__ int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb) { /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces number of warnings when compiling with -W --ANK */ if (atomic_read(&sk->rmem_alloc) + skb->truesize >= (unsigned)sk->rcvbuf) return -ENOMEM; skb_set_owner_r(skb, sk); __skb_queue_tail(&sk->error_queue,skb); if (!sk->dead) sk->data_ready(sk,skb->len); return 0; } /* * Recover an error report and clear atomically */ extern __inline__ int sock_error(struct sock *sk) { int err=xchg(&sk->err,0); return -err; } /* * Declarations from timer.c */ extern struct sock *timer_base; extern void net_delete_timer (struct sock *); extern void net_reset_timer (struct sock *, int, unsigned long); extern void net_timer (unsigned long); /* * Enable debug/info messages */ #if 0 #define NETDEBUG(x) do { } while (0) #else #define NETDEBUG(x) do { x; } while (0) #endif #endif /* _SOCK_H */