diff options
Diffstat (limited to 'net/dccp/dccp.h')
| -rw-r--r-- | net/dccp/dccp.h | 110 |
1 files changed, 78 insertions, 32 deletions
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h index 272e8584564..68886986c8e 100644 --- a/net/dccp/dccp.h +++ b/net/dccp/dccp.h @@ -18,15 +18,33 @@ #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) + +#ifdef MODULE +#define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \ + printk(fmt, ##args); \ + } while(0) +#else +#define DCCP_PRINTK(enable, fmt, args...) printk(fmt, ##args) +#endif +#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...) \ - 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) +#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...) @@ -35,17 +53,21 @@ extern int dccp_debug; 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) +/* + * 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 */ @@ -58,6 +80,20 @@ extern void dccp_time_wait(struct sock *sk, int state, int timeo); #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; +extern int sysctl_dccp_tx_qlen; + /* is seq1 < seq2 ? */ static inline int before48(const u64 seq1, const u64 seq2) { @@ -123,10 +159,36 @@ DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); #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); @@ -147,18 +209,7 @@ 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); -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 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); @@ -217,14 +268,9 @@ 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 void dccp_v4_send_check(struct sock *sk, int len, - struct sk_buff *skb); extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); -extern int dccp_v4_checksum(const struct sk_buff *skb, - const __be32 saddr, const __be32 daddr); - 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); |