#ifndef _DCCP_H #define _DCCP_H /* * net/dccp/dccp.h * * An implementation of the DCCP protocol * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/config.h> #include <linux/dccp.h> #include <net/snmp.h> #include <net/sock.h> #include <net/tcp.h> #include "ackvec.h" #ifdef CONFIG_IP_DCCP_DEBUG extern int dccp_debug; #define dccp_pr_debug(format, a...) \ do { if (dccp_debug) \ printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \ } while (0) #define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \ printk(format, ##a); } while (0) #else #define dccp_pr_debug(format, a...) #define dccp_pr_debug_cat(format, a...) #endif extern struct inet_hashinfo dccp_hashinfo; extern atomic_t dccp_orphan_count; extern int dccp_tw_count; extern void dccp_tw_deschedule(struct inet_timewait_sock *tw); extern void dccp_time_wait(struct sock *sk, int state, int timeo); /* FIXME: Right size this */ #define DCCP_MAX_OPT_LEN 128 #define DCCP_MAX_PACKET_HDR 32 #define MAX_DCCP_HEADER (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER) #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT * state, about 60 seconds */ /* draft-ietf-dccp-spec-11.txt initial RTO value */ #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) /* Maximal interval between probes for local resources. */ #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U)) #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */ extern struct proto dccp_v4_prot; /* is seq1 < seq2 ? */ static inline int before48(const u64 seq1, const u64 seq2) { return (s64)((seq1 << 16) - (seq2 << 16)) < 0; } /* is seq1 > seq2 ? */ static inline int after48(const u64 seq1, const u64 seq2) { return (s64)((seq2 << 16) - (seq1 << 16)) < 0; } /* is seq2 <= seq1 <= seq3 ? */ static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) { return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); } static inline u64 max48(const u64 seq1, const u64 seq2) { return after48(seq1, seq2) ? seq1 : seq2; } enum { DCCP_MIB_NUM = 0, DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ DCCP_MIB_ESTABRESETS, /* EstabResets */ DCCP_MIB_CURRESTAB, /* CurrEstab */ DCCP_MIB_OUTSEGS, /* OutSegs */ DCCP_MIB_OUTRSTS, DCCP_MIB_ABORTONTIMEOUT, DCCP_MIB_TIMEOUTS, DCCP_MIB_ABORTFAILED, DCCP_MIB_PASSIVEOPENS, DCCP_MIB_ATTEMPTFAILS, DCCP_MIB_OUTDATAGRAMS, DCCP_MIB_INERRS, DCCP_MIB_OPTMANDATORYERROR, DCCP_MIB_INVALIDOPT, __DCCP_MIB_MAX }; #define DCCP_MIB_MAX __DCCP_MIB_MAX struct dccp_mib { unsigned long mibs[DCCP_MIB_MAX]; } __SNMP_MIB_ALIGN__; DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field) #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) #define DCCP_ADD_STATS_BH(field, val) \ SNMP_ADD_STATS_BH(dccp_statistics, field, val) #define DCCP_ADD_STATS_USER(field, val) \ SNMP_ADD_STATS_USER(dccp_statistics, field, val) extern int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb); extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb); extern int dccp_send_response(struct sock *sk); extern void dccp_send_ack(struct sock *sk); extern void dccp_send_delayed_ack(struct sock *sk); extern void dccp_send_sync(struct sock *sk, const u64 seq, const enum dccp_pkt_type pkt_type); extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo); extern void dccp_write_space(struct sock *sk); extern void dccp_init_xmit_timers(struct sock *sk); static inline void dccp_clear_xmit_timers(struct sock *sk) { inet_csk_clear_xmit_timers(sk); } extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); extern const char *dccp_packet_name(const int type); extern const char *dccp_state_name(const int state); static inline void dccp_set_state(struct sock *sk, const int state) { const int oldstate = sk->sk_state; dccp_pr_debug("%s(%p) %-10.10s -> %s\n", dccp_role(sk), sk, dccp_state_name(oldstate), dccp_state_name(state)); WARN_ON(state == oldstate); switch (state) { case DCCP_OPEN: if (oldstate != DCCP_OPEN) DCCP_INC_STATS(DCCP_MIB_CURRESTAB); break; case DCCP_CLOSED: if (oldstate == DCCP_CLOSING || oldstate == DCCP_OPEN) DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); sk->sk_prot->unhash(sk); if (inet_csk(sk)->icsk_bind_hash != NULL && !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) inet_put_port(&dccp_hashinfo, sk); /* fall through */ default: if (oldstate == DCCP_OPEN) DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); } /* Change state AFTER socket is unhashed to avoid closed * socket sitting in hash tables. */ sk->sk_state = state; } static inline void dccp_done(struct sock *sk) { dccp_set_state(sk, DCCP_CLOSED); dccp_clear_xmit_timers(sk); sk->sk_shutdown = SHUTDOWN_MASK; if (!sock_flag(sk, SOCK_DEAD)) sk->sk_state_change(sk); else inet_csk_destroy_sock(sk); } static inline void dccp_openreq_init(struct request_sock *req, struct dccp_sock *dp, struct sk_buff *skb) { /* * FIXME: fill in the other req fields from the DCCP options * received */ inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport; inet_rsk(req)->acked = 0; req->rcv_wnd = 0; } extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); extern struct sock *dccp_create_openreq_child(struct sock *sk, const struct request_sock *req, const struct sk_buff *skb); extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); extern void dccp_v4_err(struct sk_buff *skb, u32); extern int dccp_v4_rcv(struct sk_buff *skb); extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, struct request_sock *req, struct dst_entry *dst); extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, struct request_sock *req, struct request_sock **prev); extern int dccp_child_process(struct sock *parent, struct sock *child, struct sk_buff *skb); extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, struct dccp_hdr *dh, unsigned len); extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, const struct dccp_hdr *dh, const unsigned len); extern void dccp_close(struct sock *sk, long timeout); extern struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst, struct request_sock *req); extern struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst, enum dccp_reset_codes code); extern int dccp_connect(struct sock *sk); extern int dccp_disconnect(struct sock *sk, int flags); extern int dccp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); extern int dccp_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen); extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t size); extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len, int nonblock, int flags, int *addr_len); extern void dccp_shutdown(struct sock *sk, int how); extern int dccp_v4_checksum(const struct sk_buff *skb, const u32 saddr, const u32 daddr); extern int dccp_v4_send_reset(struct sock *sk, enum dccp_reset_codes code); extern void dccp_send_close(struct sock *sk, const int active); struct dccp_skb_cb { __u8 dccpd_type:4; __u8 dccpd_ccval:4; __u8 dccpd_reset_code; __u16 dccpd_opt_len; __u64 dccpd_seq; __u64 dccpd_ack_seq; }; #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) static inline int dccp_non_data_packet(const struct sk_buff *skb) { const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; return type == DCCP_PKT_ACK || type == DCCP_PKT_CLOSE || type == DCCP_PKT_CLOSEREQ || type == DCCP_PKT_RESET || type == DCCP_PKT_SYNC || type == DCCP_PKT_SYNCACK; } static inline int dccp_packet_without_ack(const struct sk_buff *skb) { const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; } #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1) #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2) static inline void dccp_set_seqno(u64 *seqno, u64 value) { if (value > DCCP_MAX_SEQNO) value -= DCCP_MAX_SEQNO + 1; *seqno = value; } static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2) { return ((seqno2 << 16) - (seqno1 << 16)) >> 16; } static inline void dccp_inc_seqno(u64 *seqno) { if (++*seqno > DCCP_MAX_SEQNO) *seqno = 0; } static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) { struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + sizeof(*dh)); #if defined(__LITTLE_ENDIAN_BITFIELD) dh->dccph_seq = htonl((gss >> 32)) >> 8; #elif defined(__BIG_ENDIAN_BITFIELD) dh->dccph_seq = htonl((gss >> 32)); #else #error "Adjust your <asm/byteorder.h> defines" #endif dhx->dccph_seq_low = htonl(gss & 0xffffffff); } static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, const u64 gsr) { #if defined(__LITTLE_ENDIAN_BITFIELD) dhack->dccph_ack_nr_high = htonl((gsr >> 32)) >> 8; #elif defined(__BIG_ENDIAN_BITFIELD) dhack->dccph_ack_nr_high = htonl((gsr >> 32)); #else #error "Adjust your <asm/byteorder.h> defines" #endif dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); } static inline void dccp_update_gsr(struct sock *sk, u64 seq) { struct dccp_sock *dp = dccp_sk(sk); dp->dccps_gsr = seq; dccp_set_seqno(&dp->dccps_swl, (dp->dccps_gsr + 1 - (dp->dccps_options.dccpo_sequence_window / 4))); dccp_set_seqno(&dp->dccps_swh, (dp->dccps_gsr + (3 * dp->dccps_options.dccpo_sequence_window) / 4)); } static inline void dccp_update_gss(struct sock *sk, u64 seq) { struct dccp_sock *dp = dccp_sk(sk); dp->dccps_awh = dp->dccps_gss = seq; dccp_set_seqno(&dp->dccps_awl, (dp->dccps_gss - dp->dccps_options.dccpo_sequence_window + 1)); } static inline int dccp_ack_pending(const struct sock *sk) { const struct dccp_sock *dp = dccp_sk(sk); return dp->dccps_timestamp_echo != 0 || #ifdef CONFIG_IP_DCCP_ACKVEC (dp->dccps_options.dccpo_send_ack_vector && dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) || #endif inet_csk_ack_scheduled(sk); } extern void dccp_insert_options(struct sock *sk, struct sk_buff *skb); extern void dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb, u32 elapsed_time); extern void dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb); extern void dccp_insert_option(struct sock *sk, struct sk_buff *skb, unsigned char option, const void *value, unsigned char len); extern struct socket *dccp_ctl_socket; extern void dccp_timestamp(const struct sock *sk, struct timeval *tv); static inline suseconds_t timeval_usecs(const struct timeval *tv) { return tv->tv_sec * USEC_PER_SEC + tv->tv_usec; } static inline suseconds_t timeval_delta(const struct timeval *large, const struct timeval *small) { time_t secs = large->tv_sec - small->tv_sec; suseconds_t usecs = large->tv_usec - small->tv_usec; if (usecs < 0) { secs--; usecs += USEC_PER_SEC; } return secs * USEC_PER_SEC + usecs; } static inline void timeval_add_usecs(struct timeval *tv, const suseconds_t usecs) { tv->tv_usec += usecs; while (tv->tv_usec >= USEC_PER_SEC) { tv->tv_sec++; tv->tv_usec -= USEC_PER_SEC; } } static inline void timeval_sub_usecs(struct timeval *tv, const suseconds_t usecs) { tv->tv_usec -= usecs; while (tv->tv_usec < 0) { tv->tv_sec--; tv->tv_usec += USEC_PER_SEC; } } #endif /* _DCCP_H */