#include <linux/percpu.h>
#include <linux/skbuff.h>
#include <linux/dmaengine.h>
+#include <linux/crypto.h>
+#include <linux/cryptohash.h>
#include <net/inet_connection_sock.h>
#include <net/inet_timewait_sock.h>
#include <net/snmp.h>
#include <net/ip.h>
#include <net/tcp_states.h>
+#include <net/inet_ecn.h>
#include <linux/seq_file.h>
#define MAX_TCP_SYNCNT 127
#define TCP_SYNQ_INTERVAL (HZ/5) /* Period of SYNACK timer */
-#define TCP_SYNQ_HSIZE 512 /* Size of SYNACK hash table */
#define TCP_PAWS_24DAYS (60 * 60 * 24 * 24)
#define TCP_PAWS_MSL 60 /* Per-host timestamps are invalidated
#define TCPOPT_SACK_PERM 4 /* SACK Permitted */
#define TCPOPT_SACK 5 /* SACK Block */
#define TCPOPT_TIMESTAMP 8 /* Better RTT estimations/PAWS */
+#define TCPOPT_MD5SIG 19 /* MD5 Signature (RFC2385) */
/*
* TCP option lengths
#define TCPOLEN_WINDOW 3
#define TCPOLEN_SACK_PERM 2
#define TCPOLEN_TIMESTAMP 10
+#define TCPOLEN_MD5SIG 18
/* But this is what stacks really send out. */
#define TCPOLEN_TSTAMP_ALIGNED 12
#define TCPOLEN_SACK_BASE 2
#define TCPOLEN_SACK_BASE_ALIGNED 4
#define TCPOLEN_SACK_PERBLOCK 8
+#define TCPOLEN_MD5SIG_ALIGNED 20
/* Flags in tp->nonagle */
#define TCP_NAGLE_OFF 1 /* Nagle's algo is disabled */
extern int sysctl_tcp_adv_win_scale;
extern int sysctl_tcp_tw_reuse;
extern int sysctl_tcp_frto;
+extern int sysctl_tcp_frto_response;
extern int sysctl_tcp_low_latency;
extern int sysctl_tcp_dma_copybreak;
extern int sysctl_tcp_nometrics_save;
extern int sysctl_tcp_base_mss;
extern int sysctl_tcp_workaround_signed_windows;
extern int sysctl_tcp_slow_start_after_idle;
+extern int sysctl_tcp_max_ssthresh;
extern atomic_t tcp_memory_allocated;
extern atomic_t tcp_sockets_allocated;
{
return (__s32)(seq1-seq2) < 0;
}
-
-static inline int after(__u32 seq1, __u32 seq2)
-{
- return (__s32)(seq2-seq1) < 0;
-}
-
+#define after(seq2, seq1) before(seq1, seq2)
/* is s2<=s1<=s3 ? */
static inline int between(__u32 seq1, __u32 seq2, __u32 seq3)
return seq3 - seq2 >= seq1 - seq2;
}
+static inline int tcp_too_many_orphans(struct sock *sk, int num)
+{
+ return (num > sysctl_tcp_max_orphans) ||
+ (sk->sk_wmem_queued > SOCK_MIN_SNDBUF &&
+ atomic_read(&tcp_memory_allocated) > sysctl_tcp_mem[2]);
+}
extern struct proto tcp_prot;
DECLARE_SNMP_STAT(struct tcp_mib, tcp_statistics);
-#define TCP_INC_STATS(field) SNMP_INC_STATS(tcp_statistics, field)
-#define TCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(tcp_statistics, field)
-#define TCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(tcp_statistics, field)
-#define TCP_DEC_STATS(field) SNMP_DEC_STATS(tcp_statistics, field)
-#define TCP_ADD_STATS_BH(field, val) SNMP_ADD_STATS_BH(tcp_statistics, field, val)
-#define TCP_ADD_STATS_USER(field, val) SNMP_ADD_STATS_USER(tcp_statistics, field, val)
+#define TCP_INC_STATS(net, field) do { (void)net; SNMP_INC_STATS(tcp_statistics, field); } while (0)
+#define TCP_INC_STATS_BH(net, field) do { (void)net; SNMP_INC_STATS_BH(tcp_statistics, field); } while (0)
+#define TCP_DEC_STATS(net, field) do { (void)net; SNMP_DEC_STATS(tcp_statistics, field); } while (0)
+#define TCP_ADD_STATS_USER(net, field, val) do { (void)net; SNMP_ADD_STATS_USER(tcp_statistics, field, val); } while (0)
extern void tcp_v4_err(struct sk_buff *skb, u32);
extern int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw);
-extern int tcp_sendmsg(struct kiocb *iocb, struct sock *sk,
+extern int tcp_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size);
extern ssize_t tcp_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags);
extern int tcp_twsk_unique(struct sock *sk,
struct sock *sktw, void *twp);
+extern void tcp_twsk_destructor(struct sock *sk);
+
+extern ssize_t tcp_splice_read(struct socket *sk, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len, unsigned int flags);
+
static inline void tcp_dec_quickack_mode(struct sock *sk,
const unsigned int pkts)
{
rx_opt->tstamp_ok = rx_opt->sack_ok = rx_opt->wscale_ok = rx_opt->snd_wscale = 0;
}
+#define TCP_ECN_OK 1
+#define TCP_ECN_QUEUE_CWR 2
+#define TCP_ECN_DEMAND_CWR 4
+
+static __inline__ void
+TCP_ECN_create_request(struct request_sock *req, struct tcphdr *th)
+{
+ if (sysctl_tcp_ecn && th->ece && th->cwr)
+ inet_rsk(req)->ecn_ok = 1;
+}
+
enum tcp_tw_status
{
TCP_TW_SUCCESS = 0,
extern int tcp_child_process(struct sock *parent,
struct sock *child,
struct sk_buff *skb);
+extern int tcp_use_frto(struct sock *sk);
extern void tcp_enter_frto(struct sock *sk);
extern void tcp_enter_loss(struct sock *sk, int how);
extern void tcp_clear_retrans(struct tcp_sock *tp);
struct tcp_options_received *opt_rx,
int estab);
+extern u8 *tcp_parse_md5sig_option(struct tcphdr *th);
+
/*
* TCP v4 functions exported for the inet6 API
*/
extern int tcp_disconnect(struct sock *sk, int flags);
-extern void tcp_unhash(struct sock *sk);
/* From syncookies.c */
+extern __u32 syncookie_secret[2][16-4+SHA_DIGEST_WORDS];
extern struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
struct ip_options *opt);
extern __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb,
__u16 *mss);
+extern __u32 cookie_init_timestamp(struct request_sock *req);
+extern void cookie_check_timestamp(struct tcp_options_received *tcp_opt);
+
+/* From net/ipv6/syncookies.c */
+extern struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb);
+extern __u32 cookie_v6_init_sequence(struct sock *sk, struct sk_buff *skb,
+ __u16 *mss);
+
/* tcp_output.c */
-extern void __tcp_push_pending_frames(struct sock *sk, struct tcp_sock *tp,
- unsigned int cur_mss, int nonagle);
-extern int tcp_may_send_now(struct sock *sk, struct tcp_sock *tp);
+extern void __tcp_push_pending_frames(struct sock *sk, unsigned int cur_mss,
+ int nonagle);
+extern int tcp_may_send_now(struct sock *sk);
extern int tcp_retransmit_skb(struct sock *, struct sk_buff *);
extern void tcp_xmit_retransmit_queue(struct sock *);
extern void tcp_simple_retransmit(struct sock *);
__tcp_fast_path_on(tp, tp->snd_wnd >> tp->rx_opt.snd_wscale);
}
-static inline void tcp_fast_path_check(struct sock *sk, struct tcp_sock *tp)
+static inline void tcp_fast_path_check(struct sock *sk)
{
+ struct tcp_sock *tp = tcp_sk(sk);
+
if (skb_queue_empty(&tp->out_of_order_queue) &&
tp->rcv_wnd &&
atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf &&
#define TCPCB_EVER_RETRANS 0x80 /* Ever retransmitted frame */
#define TCPCB_RETRANS (TCPCB_SACKED_RETRANS|TCPCB_EVER_RETRANS)
-#define TCPCB_URG 0x20 /* Urgent pointer advanced here */
-
-#define TCPCB_AT_TAIL (TCPCB_URG)
-
__u16 urg_ptr; /* Valid w/URG flags is set. */
__u32 ack_seq; /* Sequence number ACK'd */
};
#define TCP_SKB_CB(__skb) ((struct tcp_skb_cb *)&((__skb)->cb[0]))
-#include <net/tcp_ecn.h>
-
/* Due to TSO, an SKB can be composed of multiple actual
* packets. To keep these tracked properly, we use this.
*/
return skb_shinfo(skb)->gso_size;
}
-static inline void tcp_dec_pcount_approx(__u32 *count,
- const struct sk_buff *skb)
+static inline void tcp_dec_pcount_approx_int(__u32 *count, const int decr)
{
if (*count) {
- *count -= tcp_skb_pcount(skb);
+ *count -= decr;
if ((int)*count < 0)
*count = 0;
}
}
-static inline void tcp_packets_out_inc(struct sock *sk,
- struct tcp_sock *tp,
- const struct sk_buff *skb)
-{
- int orig = tp->packets_out;
-
- tp->packets_out += tcp_skb_pcount(skb);
- if (!orig)
- inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
- inet_csk(sk)->icsk_rto, TCP_RTO_MAX);
-}
-
-static inline void tcp_packets_out_dec(struct tcp_sock *tp,
- const struct sk_buff *skb)
+static inline void tcp_dec_pcount_approx(__u32 *count,
+ const struct sk_buff *skb)
{
- tp->packets_out -= tcp_skb_pcount(skb);
+ tcp_dec_pcount_approx_int(count, tcp_skb_pcount(skb));
}
/* Events passed to congestion control interface */
* Interface for adding new TCP congestion control handlers
*/
#define TCP_CA_NAME_MAX 16
+#define TCP_CA_MAX 128
+#define TCP_CA_BUF_MAX (TCP_CA_NAME_MAX*TCP_CA_MAX)
+
+#define TCP_CONG_NON_RESTRICTED 0x1
+#define TCP_CONG_RTT_STAMP 0x2
+
struct tcp_congestion_ops {
struct list_head list;
+ unsigned long flags;
/* initialize private data (optional) */
void (*init)(struct sock *sk);
/* lower bound for congestion window (optional) */
u32 (*min_cwnd)(const struct sock *sk);
/* do new cwnd calculation (required) */
- void (*cong_avoid)(struct sock *sk, u32 ack,
- u32 rtt, u32 in_flight, int good_ack);
- /* round trip time sample per acked packet (optional) */
- void (*rtt_sample)(struct sock *sk, u32 usrtt);
+ void (*cong_avoid)(struct sock *sk, u32 ack, u32 in_flight);
/* call before changing ca_state (optional) */
void (*set_state)(struct sock *sk, u8 new_state);
/* call when cwnd event occurs (optional) */
/* new value of cwnd after loss (optional) */
u32 (*undo_cwnd)(struct sock *sk);
/* hook for packet ack accounting (optional) */
- void (*pkts_acked)(struct sock *sk, u32 num_acked);
+ void (*pkts_acked)(struct sock *sk, u32 num_acked, s32 rtt_us);
/* get info for inet_diag (optional) */
void (*get_info)(struct sock *sk, u32 ext, struct sk_buff *skb);
extern void tcp_cleanup_congestion_control(struct sock *sk);
extern int tcp_set_default_congestion_control(const char *name);
extern void tcp_get_default_congestion_control(char *name);
+extern void tcp_get_available_congestion_control(char *buf, size_t len);
+extern void tcp_get_allowed_congestion_control(char *buf, size_t len);
+extern int tcp_set_allowed_congestion_control(char *allowed);
extern int tcp_set_congestion_control(struct sock *sk, const char *name);
extern void tcp_slow_start(struct tcp_sock *tp);
extern struct tcp_congestion_ops tcp_init_congestion_ops;
extern u32 tcp_reno_ssthresh(struct sock *sk);
-extern void tcp_reno_cong_avoid(struct sock *sk, u32 ack,
- u32 rtt, u32 in_flight, int flag);
+extern void tcp_reno_cong_avoid(struct sock *sk, u32 ack, u32 in_flight);
extern u32 tcp_reno_min_cwnd(const struct sock *sk);
extern struct tcp_congestion_ops tcp_reno;
icsk->icsk_ca_ops->cwnd_event(sk, event);
}
+/* These functions determine how the current flow behaves in respect of SACK
+ * handling. SACK is negotiated with the peer, and therefore it can vary
+ * between different flows.
+ *
+ * tcp_is_sack - SACK enabled
+ * tcp_is_reno - No SACK
+ * tcp_is_fack - FACK enabled, implies SACK enabled
+ */
+static inline int tcp_is_sack(const struct tcp_sock *tp)
+{
+ return tp->rx_opt.sack_ok;
+}
+
+static inline int tcp_is_reno(const struct tcp_sock *tp)
+{
+ return !tcp_is_sack(tp);
+}
+
+static inline int tcp_is_fack(const struct tcp_sock *tp)
+{
+ return tp->rx_opt.sack_ok & 2;
+}
+
+static inline void tcp_enable_fack(struct tcp_sock *tp)
+{
+ tp->rx_opt.sack_ok |= 2;
+}
+
+static inline unsigned int tcp_left_out(const struct tcp_sock *tp)
+{
+ return tp->sacked_out + tp->lost_out;
+}
+
/* This determines how many packets are "in the network" to the best
* of our knowledge. In many cases it is conservative, but where
* detailed information is available from the receiver (via SACK
*/
static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp)
{
- return (tp->packets_out - tp->left_out + tp->retrans_out);
+ return tp->packets_out - tcp_left_out(tp) + tp->retrans_out;
}
+extern int tcp_limit_reno_sacked(struct tcp_sock *tp);
+
/* If cwnd > ssthresh, we may raise ssthresh to be half-way to cwnd.
* The exception is rate halving phase, when cwnd is decreasing towards
* ssthresh.
(tp->snd_cwnd >> 2)));
}
-static inline void tcp_sync_left_out(struct tcp_sock *tp)
-{
- if (tp->rx_opt.sack_ok &&
- (tp->sacked_out >= tp->packets_out - tp->lost_out))
- tp->sacked_out = tp->packets_out - tp->lost_out;
- tp->left_out = tp->sacked_out + tp->lost_out;
-}
+/* Use define here intentionally to get WARN_ON location shown at the caller */
+#define tcp_verify_left_out(tp) WARN_ON(tcp_left_out(tp) > tp->packets_out)
-extern void tcp_enter_cwr(struct sock *sk);
+extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh);
extern __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst);
/* Slow start with delack produces 3 packets of burst, so that
- * it is safe "de facto".
+ * it is safe "de facto". This will be the default - same as
+ * the default reordering threshold - but if reordering increases,
+ * we must be able to allow cwnd to burst at least this much in order
+ * to not pull it back when holes are filled.
*/
static __inline__ __u32 tcp_max_burst(const struct tcp_sock *tp)
{
- return 3;
+ return tp->reordering;
}
-/* RFC2861 Check whether we are limited by application or congestion window
- * This is the inverse of cwnd check in tcp_tso_should_defer
- */
-static inline int tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight)
+/* Returns end sequence number of the receiver's advertised window */
+static inline u32 tcp_wnd_end(const struct tcp_sock *tp)
{
- const struct tcp_sock *tp = tcp_sk(sk);
- u32 left;
-
- if (in_flight >= tp->snd_cwnd)
- return 1;
-
- if (!sk_can_gso(sk))
- return 0;
-
- left = tp->snd_cwnd - in_flight;
- if (sysctl_tcp_tso_win_divisor)
- return left * sysctl_tcp_tso_win_divisor < tp->snd_cwnd;
- else
- return left <= tcp_max_burst(tp);
+ return tp->snd_una + tp->snd_wnd;
}
+extern int tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight);
-static inline void tcp_minshall_update(struct tcp_sock *tp, int mss,
+static inline void tcp_minshall_update(struct tcp_sock *tp, unsigned int mss,
const struct sk_buff *skb)
{
if (skb->len < mss)
tp->snd_sml = TCP_SKB_CB(skb)->end_seq;
}
-static inline void tcp_check_probe_timer(struct sock *sk, struct tcp_sock *tp)
+static inline void tcp_check_probe_timer(struct sock *sk)
{
+ struct tcp_sock *tp = tcp_sk(sk);
const struct inet_connection_sock *icsk = inet_csk(sk);
+
if (!tp->packets_out && !icsk->icsk_pending)
inet_csk_reset_xmit_timer(sk, ICSK_TIME_PROBE0,
icsk->icsk_rto, TCP_RTO_MAX);
}
-static inline void tcp_push_pending_frames(struct sock *sk,
- struct tcp_sock *tp)
+static inline void tcp_push_pending_frames(struct sock *sk)
{
- __tcp_push_pending_frames(sk, tp, tcp_current_mss(sk, 1), tp->nonagle);
+ struct tcp_sock *tp = tcp_sk(sk);
+
+ __tcp_push_pending_frames(sk, tcp_current_mss(sk, 1), tp->nonagle);
}
static inline void tcp_init_wl(struct tcp_sock *tp, u32 ack, u32 seq)
/*
* Calculate(/check) TCP checksum
*/
-static inline u16 tcp_v4_check(struct tcphdr *th, int len,
- unsigned long saddr, unsigned long daddr,
- unsigned long base)
+static inline __sum16 tcp_v4_check(int len, __be32 saddr,
+ __be32 daddr, __wsum base)
{
return csum_tcpudp_magic(saddr,daddr,len,IPPROTO_TCP,base);
}
-static inline int __tcp_checksum_complete(struct sk_buff *skb)
+static inline __sum16 __tcp_checksum_complete(struct sk_buff *skb)
{
return __skb_checksum_complete(skb);
}
static inline int tcp_checksum_complete(struct sk_buff *skb)
{
- return skb->ip_summed != CHECKSUM_UNNECESSARY &&
+ return !skb_csum_unnecessary(skb) &&
__tcp_checksum_complete(skb);
}
"Close Wait","Last ACK","Listen","Closing"
};
#endif
+extern void tcp_set_state(struct sock *sk, int state);
-static inline void tcp_set_state(struct sock *sk, int state)
-{
- int oldstate = sk->sk_state;
-
- switch (state) {
- case TCP_ESTABLISHED:
- if (oldstate != TCP_ESTABLISHED)
- TCP_INC_STATS(TCP_MIB_CURRESTAB);
- break;
-
- case TCP_CLOSE:
- if (oldstate == TCP_CLOSE_WAIT || oldstate == TCP_ESTABLISHED)
- TCP_INC_STATS(TCP_MIB_ESTABRESETS);
-
- sk->sk_prot->unhash(sk);
- if (inet_csk(sk)->icsk_bind_hash &&
- !(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
- inet_put_port(&tcp_hashinfo, sk);
- /* fall through */
- default:
- if (oldstate==TCP_ESTABLISHED)
- TCP_DEC_STATS(TCP_MIB_CURRESTAB);
- }
-
- /* Change state AFTER socket is unhashed to avoid closed
- * socket sitting in hash tables.
- */
- sk->sk_state = state;
-
-#ifdef STATE_TRACE
- SOCK_DEBUG(sk, "TCP sk=%p, State %s -> %s\n",sk, statename[oldstate],statename[state]);
-#endif
-}
-
-static inline void tcp_done(struct sock *sk)
-{
- tcp_set_state(sk, TCP_CLOSE);
- tcp_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);
-}
+extern void tcp_done(struct sock *sk);
static inline void tcp_sack_reset(struct tcp_options_received *rx_opt)
{
struct inet_request_sock *ireq = inet_rsk(req);
req->rcv_wnd = 0; /* So that tcp_send_synack() knows! */
+ req->cookie_ts = 0;
tcp_rsk(req)->rcv_isn = TCP_SKB_CB(skb)->seq;
req->mss = rx_opt->mss_clamp;
req->ts_recent = rx_opt->saw_tstamp ? rx_opt->rcv_tsval : 0;
ireq->wscale_ok = rx_opt->wscale_ok;
ireq->acked = 0;
ireq->ecn_ok = 0;
- ireq->rmt_port = skb->h.th->source;
+ ireq->rmt_port = tcp_hdr(skb)->source;
}
-extern void tcp_enter_memory_pressure(void);
+extern void tcp_enter_memory_pressure(struct sock *sk);
static inline int keepalive_intvl_when(const struct tcp_sock *tp)
{
{
if ((s32)(rx_opt->rcv_tsval - rx_opt->ts_recent) >= 0)
return 0;
- if (xtime.tv_sec >= rx_opt->ts_recent_stamp + TCP_PAWS_24DAYS)
+ if (get_seconds() >= rx_opt->ts_recent_stamp + TCP_PAWS_24DAYS)
return 0;
/* RST segments are not recommended to carry timestamp,
However, we can relax time bounds for RST segments to MSL.
*/
- if (rst && xtime.tv_sec >= rx_opt->ts_recent_stamp + TCP_PAWS_MSL)
+ if (rst && get_seconds() >= rx_opt->ts_recent_stamp + TCP_PAWS_MSL)
return 0;
return 1;
}
#define TCP_CHECK_TIMER(sk) do { } while (0)
-static inline int tcp_use_frto(const struct sock *sk)
-{
- const struct tcp_sock *tp = tcp_sk(sk);
-
- /* F-RTO must be activated in sysctl and there must be some
- * unsent new data, and the advertised window should allow
- * sending it.
- */
- return (sysctl_tcp_frto && sk->sk_send_head &&
- !after(TCP_SKB_CB(sk->sk_send_head)->end_seq,
- tp->snd_una + tp->snd_wnd));
-}
-
-static inline void tcp_mib_init(void)
+static inline void tcp_mib_init(struct net *net)
{
/* See RFC 2012 */
- TCP_ADD_STATS_USER(TCP_MIB_RTOALGORITHM, 1);
- TCP_ADD_STATS_USER(TCP_MIB_RTOMIN, TCP_RTO_MIN*1000/HZ);
- TCP_ADD_STATS_USER(TCP_MIB_RTOMAX, TCP_RTO_MAX*1000/HZ);
- TCP_ADD_STATS_USER(TCP_MIB_MAXCONN, -1);
+ TCP_ADD_STATS_USER(net, TCP_MIB_RTOALGORITHM, 1);
+ TCP_ADD_STATS_USER(net, TCP_MIB_RTOMIN, TCP_RTO_MIN*1000/HZ);
+ TCP_ADD_STATS_USER(net, TCP_MIB_RTOMAX, TCP_RTO_MAX*1000/HZ);
+ TCP_ADD_STATS_USER(net, TCP_MIB_MAXCONN, -1);
}
-/*from STCP */
-static inline void clear_all_retrans_hints(struct tcp_sock *tp){
+/* from STCP */
+static inline void tcp_clear_retrans_hints_partial(struct tcp_sock *tp)
+{
tp->lost_skb_hint = NULL;
tp->scoreboard_skb_hint = NULL;
tp->retransmit_skb_hint = NULL;
tp->forward_skb_hint = NULL;
- tp->fastpath_skb_hint = NULL;
+}
+
+static inline void tcp_clear_all_retrans_hints(struct tcp_sock *tp)
+{
+ tcp_clear_retrans_hints_partial(tp);
+}
+
+/* MD5 Signature */
+struct crypto_hash;
+
+/* - key database */
+struct tcp_md5sig_key {
+ u8 *key;
+ u8 keylen;
+};
+
+struct tcp4_md5sig_key {
+ struct tcp_md5sig_key base;
+ __be32 addr;
+};
+
+struct tcp6_md5sig_key {
+ struct tcp_md5sig_key base;
+#if 0
+ u32 scope_id; /* XXX */
+#endif
+ struct in6_addr addr;
+};
+
+/* - sock block */
+struct tcp_md5sig_info {
+ struct tcp4_md5sig_key *keys4;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ struct tcp6_md5sig_key *keys6;
+ u32 entries6;
+ u32 alloced6;
+#endif
+ u32 entries4;
+ u32 alloced4;
+};
+
+/* - pseudo header */
+struct tcp4_pseudohdr {
+ __be32 saddr;
+ __be32 daddr;
+ __u8 pad;
+ __u8 protocol;
+ __be16 len;
+};
+
+struct tcp6_pseudohdr {
+ struct in6_addr saddr;
+ struct in6_addr daddr;
+ __be32 len;
+ __be32 protocol; /* including padding */
+};
+
+union tcp_md5sum_block {
+ struct tcp4_pseudohdr ip4;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ struct tcp6_pseudohdr ip6;
+#endif
+};
+
+/* - pool: digest algorithm, hash description and scratch buffer */
+struct tcp_md5sig_pool {
+ struct hash_desc md5_desc;
+ union tcp_md5sum_block md5_blk;
+};
+
+#define TCP_MD5SIG_MAXKEYS (~(u32)0) /* really?! */
+
+/* - functions */
+extern int tcp_calc_md5_hash(char *md5_hash,
+ struct tcp_md5sig_key *key,
+ int bplen,
+ struct tcphdr *th,
+ unsigned int tcplen,
+ struct tcp_md5sig_pool *hp);
+
+extern int tcp_v4_calc_md5_hash(char *md5_hash,
+ struct tcp_md5sig_key *key,
+ struct sock *sk,
+ struct dst_entry *dst,
+ struct request_sock *req,
+ struct tcphdr *th,
+ unsigned int tcplen);
+extern struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk,
+ struct sock *addr_sk);
+
+extern int tcp_v4_md5_do_add(struct sock *sk,
+ __be32 addr,
+ u8 *newkey,
+ u8 newkeylen);
+
+extern int tcp_v4_md5_do_del(struct sock *sk,
+ __be32 addr);
+
+#ifdef CONFIG_TCP_MD5SIG
+#define tcp_twsk_md5_key(twsk) ((twsk)->tw_md5_keylen ? \
+ &(struct tcp_md5sig_key) { \
+ .key = (twsk)->tw_md5_key, \
+ .keylen = (twsk)->tw_md5_keylen, \
+ } : NULL)
+#else
+#define tcp_twsk_md5_key(twsk) NULL
+#endif
+
+extern struct tcp_md5sig_pool **tcp_alloc_md5sig_pool(void);
+extern void tcp_free_md5sig_pool(void);
+
+extern struct tcp_md5sig_pool *__tcp_get_md5sig_pool(int cpu);
+extern void __tcp_put_md5sig_pool(void);
+
+static inline
+struct tcp_md5sig_pool *tcp_get_md5sig_pool(void)
+{
+ int cpu = get_cpu();
+ struct tcp_md5sig_pool *ret = __tcp_get_md5sig_pool(cpu);
+ if (!ret)
+ put_cpu();
+ return ret;
+}
+
+static inline void tcp_put_md5sig_pool(void)
+{
+ __tcp_put_md5sig_pool();
+ put_cpu();
+}
+
+/* write queue abstraction */
+static inline void tcp_write_queue_purge(struct sock *sk)
+{
+ struct sk_buff *skb;
+
+ while ((skb = __skb_dequeue(&sk->sk_write_queue)) != NULL)
+ sk_wmem_free_skb(sk, skb);
+ sk_mem_reclaim(sk);
+}
+
+static inline struct sk_buff *tcp_write_queue_head(struct sock *sk)
+{
+ struct sk_buff *skb = sk->sk_write_queue.next;
+ if (skb == (struct sk_buff *) &sk->sk_write_queue)
+ return NULL;
+ return skb;
+}
+
+static inline struct sk_buff *tcp_write_queue_tail(struct sock *sk)
+{
+ struct sk_buff *skb = sk->sk_write_queue.prev;
+ if (skb == (struct sk_buff *) &sk->sk_write_queue)
+ return NULL;
+ return skb;
+}
+
+static inline struct sk_buff *tcp_write_queue_next(struct sock *sk, struct sk_buff *skb)
+{
+ return skb->next;
+}
+
+#define tcp_for_write_queue(skb, sk) \
+ for (skb = (sk)->sk_write_queue.next; \
+ (skb != (struct sk_buff *)&(sk)->sk_write_queue); \
+ skb = skb->next)
+
+#define tcp_for_write_queue_from(skb, sk) \
+ for (; (skb != (struct sk_buff *)&(sk)->sk_write_queue);\
+ skb = skb->next)
+
+#define tcp_for_write_queue_from_safe(skb, tmp, sk) \
+ for (tmp = skb->next; \
+ (skb != (struct sk_buff *)&(sk)->sk_write_queue); \
+ skb = tmp, tmp = skb->next)
+
+static inline struct sk_buff *tcp_send_head(struct sock *sk)
+{
+ return sk->sk_send_head;
+}
+
+static inline void tcp_advance_send_head(struct sock *sk, struct sk_buff *skb)
+{
+ sk->sk_send_head = skb->next;
+ if (sk->sk_send_head == (struct sk_buff *)&sk->sk_write_queue)
+ sk->sk_send_head = NULL;
+}
+
+static inline void tcp_check_send_head(struct sock *sk, struct sk_buff *skb_unlinked)
+{
+ if (sk->sk_send_head == skb_unlinked)
+ sk->sk_send_head = NULL;
+}
+
+static inline void tcp_init_send_head(struct sock *sk)
+{
+ sk->sk_send_head = NULL;
+}
+
+static inline void __tcp_add_write_queue_tail(struct sock *sk, struct sk_buff *skb)
+{
+ __skb_queue_tail(&sk->sk_write_queue, skb);
+}
+
+static inline void tcp_add_write_queue_tail(struct sock *sk, struct sk_buff *skb)
+{
+ __tcp_add_write_queue_tail(sk, skb);
+
+ /* Queue it, remembering where we must start sending. */
+ if (sk->sk_send_head == NULL) {
+ sk->sk_send_head = skb;
+
+ if (tcp_sk(sk)->highest_sack == NULL)
+ tcp_sk(sk)->highest_sack = skb;
+ }
+}
+
+static inline void __tcp_add_write_queue_head(struct sock *sk, struct sk_buff *skb)
+{
+ __skb_queue_head(&sk->sk_write_queue, skb);
+}
+
+/* Insert buff after skb on the write queue of sk. */
+static inline void tcp_insert_write_queue_after(struct sk_buff *skb,
+ struct sk_buff *buff,
+ struct sock *sk)
+{
+ __skb_queue_after(&sk->sk_write_queue, skb, buff);
+}
+
+/* Insert skb between prev and next on the write queue of sk. */
+static inline void tcp_insert_write_queue_before(struct sk_buff *new,
+ struct sk_buff *skb,
+ struct sock *sk)
+{
+ __skb_insert(new, skb->prev, skb, &sk->sk_write_queue);
+
+ if (sk->sk_send_head == skb)
+ sk->sk_send_head = new;
+}
+
+static inline void tcp_unlink_write_queue(struct sk_buff *skb, struct sock *sk)
+{
+ __skb_unlink(skb, &sk->sk_write_queue);
+}
+
+static inline int tcp_skb_is_last(const struct sock *sk,
+ const struct sk_buff *skb)
+{
+ return skb->next == (struct sk_buff *)&sk->sk_write_queue;
+}
+
+static inline int tcp_write_queue_empty(struct sock *sk)
+{
+ return skb_queue_empty(&sk->sk_write_queue);
+}
+
+/* Start sequence of the highest skb with SACKed bit, valid only if
+ * sacked > 0 or when the caller has ensured validity by itself.
+ */
+static inline u32 tcp_highest_sack_seq(struct tcp_sock *tp)
+{
+ if (!tp->sacked_out)
+ return tp->snd_una;
+
+ if (tp->highest_sack == NULL)
+ return tp->snd_nxt;
+
+ return TCP_SKB_CB(tp->highest_sack)->seq;
+}
+
+static inline void tcp_advance_highest_sack(struct sock *sk, struct sk_buff *skb)
+{
+ tcp_sk(sk)->highest_sack = tcp_skb_is_last(sk, skb) ? NULL :
+ tcp_write_queue_next(sk, skb);
+}
+
+static inline struct sk_buff *tcp_highest_sack(struct sock *sk)
+{
+ return tcp_sk(sk)->highest_sack;
+}
+
+static inline void tcp_highest_sack_reset(struct sock *sk)
+{
+ tcp_sk(sk)->highest_sack = tcp_write_queue_head(sk);
+}
+
+/* Called when old skb is about to be deleted (to be combined with new skb) */
+static inline void tcp_highest_sack_combine(struct sock *sk,
+ struct sk_buff *old,
+ struct sk_buff *new)
+{
+ if (tcp_sk(sk)->sacked_out && (old == tcp_sk(sk)->highest_sack))
+ tcp_sk(sk)->highest_sack = new;
}
/* /proc */
};
struct tcp_seq_afinfo {
- struct module *owner;
char *name;
sa_family_t family;
- int (*seq_show) (struct seq_file *m, void *v);
- struct file_operations *seq_fops;
+ struct file_operations seq_fops;
+ struct seq_operations seq_ops;
};
struct tcp_iter_state {
+ struct seq_net_private p;
sa_family_t family;
enum tcp_seq_states state;
struct sock *syn_wait_sk;
int bucket, sbucket, num, uid;
- struct seq_operations seq_ops;
};
-extern int tcp_proc_register(struct tcp_seq_afinfo *afinfo);
-extern void tcp_proc_unregister(struct tcp_seq_afinfo *afinfo);
+extern int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo);
+extern void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo);
extern struct request_sock_ops tcp_request_sock_ops;
+extern struct request_sock_ops tcp6_request_sock_ops;
-extern int tcp_v4_destroy_sock(struct sock *sk);
+extern void tcp_v4_destroy_sock(struct sock *sk);
+extern int tcp_v4_gso_send_check(struct sk_buff *skb);
extern struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features);
#ifdef CONFIG_PROC_FS
extern void tcp4_proc_exit(void);
#endif
-extern void tcp_v4_init(struct net_proto_family *ops);
+/* TCP af-specific functions */
+struct tcp_sock_af_ops {
+#ifdef CONFIG_TCP_MD5SIG
+ struct tcp_md5sig_key *(*md5_lookup) (struct sock *sk,
+ struct sock *addr_sk);
+ int (*calc_md5_hash) (char *location,
+ struct tcp_md5sig_key *md5,
+ struct sock *sk,
+ struct dst_entry *dst,
+ struct request_sock *req,
+ struct tcphdr *th,
+ unsigned int len);
+ int (*md5_add) (struct sock *sk,
+ struct sock *addr_sk,
+ u8 *newkey,
+ u8 len);
+ int (*md5_parse) (struct sock *sk,
+ char __user *optval,
+ int optlen);
+#endif
+};
+
+struct tcp_request_sock_ops {
+#ifdef CONFIG_TCP_MD5SIG
+ struct tcp_md5sig_key *(*md5_lookup) (struct sock *sk,
+ struct request_sock *req);
+#endif
+};
+
+extern void tcp_v4_init(void);
extern void tcp_init(void);
#endif /* _TCP_H */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff