Subversion Repositories test_project

#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) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.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/dccp.h>

#include <linux/ktime.h>

#include <net/snmp.h>

#include <net/sock.h>

#include <net/tcp.h>

#include "ackvec.h"

/*

 *      DCCP - specific warning and debugging macros.

 */

#define DCCP_WARN(fmt, a...) LIMIT_NETDEBUG(KERN_WARNING "%s: " fmt,       \

                                                        __FUNCTION__, ##a)

#define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \

                                         __FILE__, __LINE__, __FUNCTION__)

#define DCCP_BUG(a...)       do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0)

#define DCCP_BUG_ON(cond)    do { if (unlikely((cond) != 0))               \

                                     DCCP_BUG("\"%s\" holds (exception!)", \

                                              __stringify(cond));          \

                             } while (0)

#define DCCP_PRINTK(enable, fmt, args...)       do { if (enable)             \

                                                        printk(fmt, ##args); \

                                                } while(0)

#define DCCP_PR_DEBUG(enable, fmt, a...)        DCCP_PRINTK(enable, KERN_DEBUG \

                                                  "%s: " fmt, __FUNCTION__, ##a)

#ifdef CONFIG_IP_DCCP_DEBUG

extern int dccp_debug;

#define dccp_pr_debug(format, a...)       DCCP_PR_DEBUG(dccp_debug, format, ##a)

#define dccp_pr_debug_cat(format, a...)   DCCP_PRINTK(dccp_debug, format, ##a)

#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 void dccp_time_wait(struct sock *sk, int state, int timeo);

/*

 *  Set safe upper bounds for header and option length. Since Data Offset is 8

 *  bits (RFC 4340, sec. 5.1), the total header length can never be more than

 *  4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):

 *    - DCCP-Response with ACK Subheader and 4 bytes of Service code      OR

 *    - DCCP-Reset    with ACK Subheader and 4 bytes of Reset Code fields

 *  Hence a safe upper bound for the maximum option length is 1020-28 = 992

 */

#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int))

#define DCCP_MAX_PACKET_HDR 28

#define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)

#define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)

#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT

                                     * state, about 60 seconds */

/* RFC 1122, 4.2.3.1 initial RTO value */

#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))

#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */

/* bounds for sampled RTT values from packet exchanges (in usec) */

#define DCCP_SANE_RTT_MIN       100

#define DCCP_SANE_RTT_MAX       (4 * USEC_PER_SEC)

/* Maximal interval between probes for local resources.  */

#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))

/* sysctl variables for DCCP */

extern int  sysctl_dccp_request_retries;

extern int  sysctl_dccp_retries1;

extern int  sysctl_dccp_retries2;

extern int  sysctl_dccp_feat_sequence_window;

extern int  sysctl_dccp_feat_rx_ccid;

extern int  sysctl_dccp_feat_tx_ccid;

extern int  sysctl_dccp_feat_ack_ratio;

extern int  sysctl_dccp_feat_send_ack_vector;

extern int  sysctl_dccp_feat_send_ndp_count;

extern int  sysctl_dccp_tx_qlen;

extern int  sysctl_dccp_sync_ratelimit;

/*

 *      48-bit sequence number arithmetic (signed and unsigned)

 */

#define INT48_MIN         0x800000000000LL              /* 2^47     */

#define UINT48_MAX        0xFFFFFFFFFFFFLL              /* 2^48 - 1 */

#define COMPLEMENT48(x)  (0x1000000000000LL - (x))      /* 2^48 - x */

#define TO_SIGNED48(x)   (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x)))

#define TO_UNSIGNED48(x) (((x) >= 0)?        (x) :  COMPLEMENT48(-(x)))

#define ADD48(a, b)      (((a) + (b)) & UINT48_MAX)

#define SUB48(a, b)      ADD48((a), COMPLEMENT48(b))

static inline void dccp_set_seqno(u64 *seqno, u64 value)

{

        *seqno = value & UINT48_MAX;

}

static inline void dccp_inc_seqno(u64 *seqno)

{

        *seqno = ADD48(*seqno, 1);

}

/* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */

static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2)

{

        u64 delta = SUB48(seqno2, seqno1);

        return TO_SIGNED48(delta);

}

/* is seq1 < seq2 ? */

static inline int before48(const u64 seq1, const u64 seq2)

{

        return (s64)((seq2 << 16) - (seq1 << 16)) > 0;

}

/* is seq1 > seq2 ? */

#define after48(seq1, seq2)     before48(seq2, seq1)

/* 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;

}

/* is seq1 next seqno after seq2 */

static inline int follows48(const u64 seq1, const u64 seq2)

{

        return dccp_delta_seqno(seq2, seq1) == 1;

}

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)

/*

 *      Checksumming routines

 */

static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb)

{

        const struct dccp_hdr* dh = dccp_hdr(skb);

        if (dh->dccph_cscov == 0)

                return skb->len;

        return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);

}

static inline void dccp_csum_outgoing(struct sk_buff *skb)

{

        unsigned int cov = dccp_csum_coverage(skb);

        if (cov >= skb->len)

                dccp_hdr(skb)->dccph_cscov = 0;

        skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);

}

extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb);

extern int  dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);

extern void dccp_send_ack(struct sock *sk);

extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk);

extern void dccp_send_sync(struct sock *sk, const u64 seq,

                           const enum dccp_pkt_type pkt_type);

extern void dccp_write_xmit(struct sock *sk, int block);

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);

extern void dccp_set_state(struct sock *sk, const int state);

extern void dccp_done(struct sock *sk);

extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb);

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 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 int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);

extern int dccp_destroy_sock(struct sock *sk);

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 int         dccp_connect(struct sock *sk);

extern int         dccp_disconnect(struct sock *sk, int flags);

extern void        dccp_hash(struct sock *sk);

extern void        dccp_unhash(struct sock *sk);

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);

#ifdef CONFIG_COMPAT

extern int         compat_dccp_getsockopt(struct sock *sk,

                                int level, int optname,

                                char __user *optval, int __user *optlen);

extern int         compat_dccp_setsockopt(struct sock *sk,

                                int level, int optname,

                                char __user *optval, int optlen);

#endif

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         inet_dccp_listen(struct socket *sock, int backlog);

extern unsigned int dccp_poll(struct file *file, struct socket *sock,

                             poll_table *wait);

extern int         dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,

                                   int addr_len);

extern struct sk_buff *dccp_ctl_make_reset(struct socket *ctl,

                                           struct sk_buff *skb);

extern int         dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);

extern void        dccp_send_close(struct sock *sk, const int active);

extern int         dccp_invalid_packet(struct sk_buff *skb);

extern u32         dccp_sample_rtt(struct sock *sk, long delta);

static inline int dccp_bad_service_code(const struct sock *sk,

                                        const __be32 service)

{

        const struct dccp_sock *dp = dccp_sk(sk);

        if (dp->dccps_service == service)

                return 0;

        return !dccp_list_has_service(dp->dccps_service_list, service);

}

/**

 * dccp_skb_cb  -  DCCP per-packet control information

 * @dccpd_type: one of %dccp_pkt_type (or unknown)

 * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1

 * @dccpd_reset_code: one of %dccp_reset_codes

 * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code)

 * @dccpd_opt_len: total length of all options (5.8) in the packet

 * @dccpd_seq: sequence number

 * @dccpd_ack_seq: acknowledgment number subheader field value

 * This is used for transmission as well as for reception.

 */

struct dccp_skb_cb {

        __u8  dccpd_type:4;

        __u8  dccpd_ccval:4;

        __u8  dccpd_reset_code,

              dccpd_reset_data[3];

        __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_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2)

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));

        dh->dccph_seq2 = 0;

        dh->dccph_seq = htons((gss >> 32) & 0xfffff);

        dhx->dccph_seq_low = htonl(gss & 0xffffffff);

}

static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,

                                    const u64 gsr)

{

        dhack->dccph_reserved1 = 0;

        dhack->dccph_ack_nr_high = htons(gsr >> 32);

        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);

        const struct dccp_minisock *dmsk = dccp_msk(sk);

        dp->dccps_gsr = seq;

        dccp_set_seqno(&dp->dccps_swl,

                       dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));

        dccp_set_seqno(&dp->dccps_swh,

                       dp->dccps_gsr + (3 * dmsk->dccpms_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 -

                        dccp_msk(sk)->dccpms_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

               (dccp_msk(sk)->dccpms_send_ack_vector &&

                dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||

#endif

               inet_csk_ack_scheduled(sk);

}

extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);

extern int dccp_insert_option_elapsed_time(struct sock *sk,

                                            struct sk_buff *skb,

                                            u32 elapsed_time);

extern u32 dccp_timestamp(void);

extern void dccp_timestamping_init(void);

extern int dccp_insert_option_timestamp(struct sock *sk,

                                         struct sk_buff *skb);

extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,

                               unsigned char option,

                               const void *value, unsigned char len);

#ifdef CONFIG_SYSCTL

extern int dccp_sysctl_init(void);

extern void dccp_sysctl_exit(void);

#else

static inline int dccp_sysctl_init(void)

{

        return 0;

}

static inline void dccp_sysctl_exit(void)

{

}

#endif

#endif /* _DCCP_H */