litmus-rt.git - The LITMUS^RT kernel.

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Diffstat (limited to 'lib/string_helpers.c')

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#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)) /* * The maximum back-off value for retransmissions. This is needed for * - retransmitting client-Requests (sec. 8.1.1), * - retransmitting Close/CloseReq when closing (sec. 8.3), * - feature-negotiation retransmission (sec. 6.6.3), * - Acks in client-PARTOPEN state (sec. 8.1.5). */ #define DCCP_RTO_MAX ((unsigned)(64 * HZ)) /* * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4 */ #define DCCP_SANE_RTT_MIN 100 #define DCCP_FALLBACK_RTT (USEC_PER_SEC / 5) #define DCCP_SANE_RTT_MAX (3 * 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) {


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