| #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 <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 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)) |
| |
| /* 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 */ |
| |
| #define DCCP_XMIT_TIMEO 30000 /* Time/msecs for blocking transmit per packet */ |
| |
| /* 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; |
| |
| /* 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; |
| } |
| |
| /* is seq1 next seqno after seq2 */ |
| static inline int follows48(const u64 seq1, const u64 seq2) |
| { |
| int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF); |
| |
| return diff==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 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) |
| { |
| 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_send_delayed_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 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); |
| |
| 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); |
| } |
| |
| 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)); |
| 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 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); |
| |
| 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; |
| } |
| } |
| |
| #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 */ |
