#ifndef _TCP_H
#define _TCP_H
-#define TCP_DEBUG 1
#define FASTRETRANS_DEBUG 1
#include <linux/list.h>
#define MAX_TCP_HEADER (128 + MAX_HEADER)
#define MAX_TCP_OPTION_SPACE 40
+#define TCP_MIN_SND_MSS 48
+#define TCP_MIN_GSO_SIZE (TCP_MIN_SND_MSS - MAX_TCP_OPTION_SPACE)
/*
* Never offer a window over 32767 without using window scaling. Some
extern int sysctl_tcp_cookie_size;
extern int sysctl_tcp_thin_linear_timeouts;
extern int sysctl_tcp_thin_dupack;
+extern int sysctl_tcp_challenge_ack_limit;
extern atomic_long_t tcp_memory_allocated;
extern struct percpu_counter tcp_sockets_allocated;
size_t size, int flags);
extern int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg);
extern int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
- struct tcphdr *th, unsigned len);
+ const struct tcphdr *th, unsigned int len);
extern int tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
- struct tcphdr *th, unsigned len);
+ const struct tcphdr *th, unsigned int len);
extern void tcp_rcv_space_adjust(struct sock *sk);
extern void tcp_cleanup_rbuf(struct sock *sk, int copied);
extern int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp);
#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;
-}
+#define TCP_ECN_SEEN 8
enum tcp_tw_status {
TCP_TW_SUCCESS = 0,
extern void tcp_syn_ack_timeout(struct sock *sk, struct request_sock *req);
extern int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
size_t len, int nonblock, int flags, int *addr_len);
-extern void tcp_parse_options(struct sk_buff *skb,
- struct tcp_options_received *opt_rx, u8 **hvpp,
+extern void tcp_parse_options(const struct sk_buff *skb,
+ struct tcp_options_received *opt_rx, const u8 **hvpp,
int estab);
-extern u8 *tcp_parse_md5sig_option(struct tcphdr *th);
+extern const u8 *tcp_parse_md5sig_option(const struct tcphdr *th);
/*
* TCP v4 functions exported for the inet6 API
/* From net/ipv6/syncookies.c */
extern struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb);
#ifdef CONFIG_SYN_COOKIES
-extern __u32 cookie_v6_init_sequence(struct sock *sk, struct sk_buff *skb,
+extern __u32 cookie_v6_init_sequence(struct sock *sk, const struct sk_buff *skb,
__u16 *mss);
#else
static inline __u32 cookie_v6_init_sequence(struct sock *sk,
}
/* tcp.c */
-extern void tcp_get_info(struct sock *, struct tcp_info *);
+extern void tcp_get_info(const struct sock *, struct tcp_info *);
/* Read 'sendfile()'-style from a TCP socket */
typedef int (*sk_read_actor_t)(read_descriptor_t *, struct sk_buff *,
extern void tcp_initialize_rcv_mss(struct sock *sk);
-extern int tcp_mtu_to_mss(struct sock *sk, int pmtu);
-extern int tcp_mss_to_mtu(struct sock *sk, int mss);
+extern int tcp_mtu_to_mss(const struct sock *sk, int pmtu);
+extern int tcp_mss_to_mtu(const struct sock *sk, int mss);
extern void tcp_mtup_init(struct sock *sk);
extern void tcp_valid_rtt_meas(struct sock *sk, u32 seq_rtt);
/* Compute the actual rto_min value */
static inline u32 tcp_rto_min(struct sock *sk)
{
- struct dst_entry *dst = __sk_dst_get(sk);
+ const struct dst_entry *dst = __sk_dst_get(sk);
u32 rto_min = TCP_RTO_MIN;
if (dst && dst_metric_locked(dst, RTAX_RTO_MIN))
__u32 seq; /* Starting sequence number */
__u32 end_seq; /* SEQ + FIN + SYN + datalen */
__u32 when; /* used to compute rtt's */
- __u8 flags; /* TCP header flags. */
+ __u8 tcp_flags; /* TCP header flags. (tcp[13]) */
__u8 sacked; /* State flags for SACK/FACK. */
#define TCPCB_SACKED_ACKED 0x01 /* SKB ACK'd by a SACK block */
#define TCPCB_SACKED_RETRANS 0x02 /* SKB retransmitted */
#define TCPCB_LOST 0x04 /* SKB is lost */
#define TCPCB_TAGBITS 0x07 /* All tag bits */
-
+ __u8 ip_dsfield; /* IPv4 tos or IPv6 dsfield */
+ /* 1 byte hole */
#define TCPCB_EVER_RETRANS 0x80 /* Ever retransmitted frame */
#define TCPCB_RETRANS (TCPCB_SACKED_RETRANS|TCPCB_EVER_RETRANS)
#define TCP_SKB_CB(__skb) ((struct tcp_skb_cb *)&((__skb)->cb[0]))
+/* RFC3168 : 6.1.1 SYN packets must not have ECT/ECN bits set
+ *
+ * If we receive a SYN packet with these bits set, it means a network is
+ * playing bad games with TOS bits. In order to avoid possible false congestion
+ * notifications, we disable TCP ECN negociation.
+ */
+static inline void
+TCP_ECN_create_request(struct request_sock *req, const struct sk_buff *skb)
+{
+ const struct tcphdr *th = tcp_hdr(skb);
+
+ if (sysctl_tcp_ecn && th->ece && th->cwr &&
+ INET_ECN_is_not_ect(TCP_SKB_CB(skb)->ip_dsfield))
+ inet_rsk(req)->ecn_ok = 1;
+}
+
/* Due to TSO, an SKB can be composed of multiple actual
* packets. To keep these tracked properly, we use this.
*/
static inline __u32 tcp_current_ssthresh(const struct sock *sk)
{
const struct tcp_sock *tp = tcp_sk(sk);
+
if ((1 << inet_csk(sk)->icsk_ca_state) & (TCPF_CA_CWR | TCPF_CA_Recovery))
return tp->snd_ssthresh;
else
#define tcp_verify_left_out(tp) WARN_ON(tcp_left_out(tp) > tp->packets_out)
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);
+extern __u32 tcp_init_cwnd(const struct tcp_sock *tp, const struct dst_entry *dst);
/* Slow start with delack produces 3 packets of burst, so that
* it is safe "de facto". This will be the default - same as
static inline void tcp_check_probe_timer(struct sock *sk)
{
- struct tcp_sock *tp = tcp_sk(sk);
+ const struct tcp_sock *tp = tcp_sk(sk);
const struct inet_connection_sock *icsk = inet_csk(sk);
if (!tp->packets_out && !icsk->icsk_pending)
if (sysctl_tcp_low_latency || !tp->ucopy.task)
return 0;
+ skb_dst_force(skb);
__skb_queue_tail(&tp->ucopy.prequeue, skb);
tp->ucopy.memory += skb->truesize;
if (tp->ucopy.memory > sk->sk_rcvbuf) {
return 1;
}
+int tcp_filter(struct sock *sk, struct sk_buff *skb);
#undef STATE_TRACE
/* - functions */
extern int tcp_v4_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
- struct sock *sk, struct request_sock *req,
- struct sk_buff *skb);
+ const struct sock *sk,
+ const struct request_sock *req,
+ const struct sk_buff *skb);
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,
#define tcp_twsk_md5_key(twsk) NULL
#endif
-extern struct tcp_md5sig_pool * __percpu *tcp_alloc_md5sig_pool(struct sock *);
-extern void tcp_free_md5sig_pool(void);
+extern bool tcp_alloc_md5sig_pool(void);
extern struct tcp_md5sig_pool *tcp_get_md5sig_pool(void);
-extern void tcp_put_md5sig_pool(void);
+static inline void tcp_put_md5sig_pool(void)
+{
+ local_bh_enable();
+}
-extern int tcp_md5_hash_header(struct tcp_md5sig_pool *, struct tcphdr *);
-extern int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *, struct sk_buff *,
+extern int tcp_md5_hash_header(struct tcp_md5sig_pool *, const struct tcphdr *);
+extern int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *, const struct sk_buff *,
unsigned header_len);
extern int tcp_md5_hash_key(struct tcp_md5sig_pool *hp,
- struct tcp_md5sig_key *key);
+ const struct tcp_md5sig_key *key);
/* write queue abstraction */
static inline void tcp_write_queue_purge(struct sock *sk)
tcp_clear_all_retrans_hints(tcp_sk(sk));
}
-static inline struct sk_buff *tcp_write_queue_head(struct sock *sk)
+static inline struct sk_buff *tcp_write_queue_head(const struct sock *sk)
{
return skb_peek(&sk->sk_write_queue);
}
-static inline struct sk_buff *tcp_write_queue_tail(struct sock *sk)
+static inline struct sk_buff *tcp_write_queue_tail(const struct sock *sk)
{
return skb_peek_tail(&sk->sk_write_queue);
}
-static inline struct sk_buff *tcp_write_queue_next(struct sock *sk, struct sk_buff *skb)
+static inline struct sk_buff *tcp_write_queue_next(const struct sock *sk,
+ const struct sk_buff *skb)
{
return skb_queue_next(&sk->sk_write_queue, skb);
}
-static inline struct sk_buff *tcp_write_queue_prev(struct sock *sk, struct sk_buff *skb)
+static inline struct sk_buff *tcp_write_queue_prev(const struct sock *sk,
+ const struct sk_buff *skb)
{
return skb_queue_prev(&sk->sk_write_queue, skb);
}
#define tcp_for_write_queue_from_safe(skb, tmp, sk) \
skb_queue_walk_from_safe(&(sk)->sk_write_queue, skb, tmp)
-static inline struct sk_buff *tcp_send_head(struct sock *sk)
+static inline struct sk_buff *tcp_send_head(const struct sock *sk)
{
return sk->sk_send_head;
}
return skb_queue_is_last(&sk->sk_write_queue, skb);
}
-static inline void tcp_advance_send_head(struct sock *sk, struct sk_buff *skb)
+static inline void tcp_advance_send_head(struct sock *sk, const struct sk_buff *skb)
{
if (tcp_skb_is_last(sk, skb))
sk->sk_send_head = NULL;
{
if (sk->sk_send_head == skb_unlinked)
sk->sk_send_head = NULL;
+ if (tcp_sk(sk)->highest_sack == skb_unlinked)
+ tcp_sk(sk)->highest_sack = NULL;
}
static inline void tcp_init_send_head(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,
+/* Called when old skb is about to be deleted and replaced by new skb */
+static inline void tcp_highest_sack_replace(struct sock *sk,
struct sk_buff *old,
struct sk_buff *new)
{
- if (tcp_sk(sk)->sacked_out && (old == tcp_sk(sk)->highest_sack))
+ if (old == tcp_highest_sack(sk))
tcp_sk(sk)->highest_sack = new;
}
TCP_SEQ_STATE_TIME_WAIT,
};
+int tcp_seq_open(struct inode *inode, struct file *file);
+
struct tcp_seq_afinfo {
- char *name;
- sa_family_t family;
- struct file_operations seq_fops;
- struct seq_operations seq_ops;
+ char *name;
+ sa_family_t family;
+ const struct file_operations *seq_fops;
+ struct seq_operations seq_ops;
};
struct tcp_iter_state {
struct sock *addr_sk);
int (*calc_md5_hash) (char *location,
struct tcp_md5sig_key *md5,
- struct sock *sk,
- struct request_sock *req,
- struct sk_buff *skb);
+ const struct sock *sk,
+ const struct request_sock *req,
+ const struct sk_buff *skb);
int (*md5_add) (struct sock *sk,
struct sock *addr_sk,
u8 *newkey,
struct request_sock *req);
int (*calc_md5_hash) (char *location,
struct tcp_md5sig_key *md5,
- struct sock *sk,
- struct request_sock *req,
- struct sk_buff *skb);
+ const struct sock *sk,
+ const struct request_sock *req,
+ const struct sk_buff *skb);
#endif
};
git.openpandora.org / pandora-kernel.git / blobdiff