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Commit 3f684b4b authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

tcp: cookie_init_sequence() cleanups 



Some common IPv4/IPv6 code can be factorized.
Also constify cookie_init_sequence() socket argument.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0c27171e

include/net/tcp.h

+10 −9
Original line number Diff line number Diff line
@@ -491,8 +491,9 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb); 


/* syncookies: remember time of last synqueue overflow

 * But do not dirty this field too often (once per second is enough)

 * It is racy as we do not hold a lock, but race is very minor.

 */

static inline void tcp_synq_overflow(struct sock *sk)

static inline void tcp_synq_overflow(const struct sock *sk)

{

	unsigned long last_overflow = tcp_sk(sk)->rx_opt.ts_recent_stamp;

	unsigned long now = jiffies;
@@ -519,8 +520,7 @@ static inline u32 tcp_cookie_time(void) 


u32 __cookie_v4_init_sequence(const struct iphdr *iph, const struct tcphdr *th,

			      u16 *mssp);

__u32 cookie_v4_init_sequence(struct sock *sk, const struct sk_buff *skb,

			      __u16 *mss);

__u32 cookie_v4_init_sequence(const struct sk_buff *skb, __u16 *mss);

__u32 cookie_init_timestamp(struct request_sock *req);

bool cookie_timestamp_decode(struct tcp_options_received *opt);

bool cookie_ecn_ok(const struct tcp_options_received *opt,
@@ -533,8 +533,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb); 


u32 __cookie_v6_init_sequence(const struct ipv6hdr *iph,

			      const struct tcphdr *th, u16 *mssp);

__u32 cookie_v6_init_sequence(struct sock *sk, const struct sk_buff *skb,

			      __u16 *mss);

__u32 cookie_v6_init_sequence(const struct sk_buff *skb, __u16 *mss);

#endif

/* tcp_output.c */
@@ -1709,7 +1708,7 @@ struct tcp_request_sock_ops { 
			 const struct sock *sk_listener,

			 struct sk_buff *skb);

#ifdef CONFIG_SYN_COOKIES

	__u32 (*cookie_init_seq)(struct sock *sk, const struct sk_buff *skb,

	__u32 (*cookie_init_seq)(const struct sk_buff *skb,

				 __u16 *mss);

#endif

	struct dst_entry *(*route_req)(struct sock *sk, struct flowi *fl,
@@ -1725,14 +1724,16 @@ struct tcp_request_sock_ops { 


#ifdef CONFIG_SYN_COOKIES

static inline __u32 cookie_init_sequence(const struct tcp_request_sock_ops *ops,

					 struct sock *sk, struct sk_buff *skb,

					 const struct sock *sk, struct sk_buff *skb,

					 __u16 *mss)

{

	return ops->cookie_init_seq(sk, skb, mss);

	tcp_synq_overflow(sk);

	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_SYNCOOKIESSENT);

	return ops->cookie_init_seq(skb, mss);

}

#else

static inline __u32 cookie_init_sequence(const struct tcp_request_sock_ops *ops,

					 struct sock *sk, struct sk_buff *skb,

					 const struct sock *sk, struct sk_buff *skb,

					 __u16 *mss)

{

	return 0;

net/ipv4/syncookies.c

+1 −5
Original line number Diff line number Diff line
@@ -192,15 +192,11 @@ u32 __cookie_v4_init_sequence(const struct iphdr *iph, const struct tcphdr *th, 
}

EXPORT_SYMBOL_GPL(__cookie_v4_init_sequence);



__u32 cookie_v4_init_sequence(struct sock *sk, const struct sk_buff *skb,

			      __u16 *mssp)

__u32 cookie_v4_init_sequence(const struct sk_buff *skb, __u16 *mssp)

{

	const struct iphdr *iph = ip_hdr(skb);

	const struct tcphdr *th = tcp_hdr(skb);



	tcp_synq_overflow(sk);

	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_SYNCOOKIESSENT);



	return __cookie_v4_init_sequence(iph, th, mssp);

}

net/ipv6/syncookies.c

+1 −4
Original line number Diff line number Diff line
@@ -114,14 +114,11 @@ u32 __cookie_v6_init_sequence(const struct ipv6hdr *iph, 
}

EXPORT_SYMBOL_GPL(__cookie_v6_init_sequence);



__u32 cookie_v6_init_sequence(struct sock *sk, const struct sk_buff *skb, __u16 *mssp)

__u32 cookie_v6_init_sequence(const struct sk_buff *skb, __u16 *mssp)

{

	const struct ipv6hdr *iph = ipv6_hdr(skb);

	const struct tcphdr *th = tcp_hdr(skb);



	tcp_synq_overflow(sk);

	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_SYNCOOKIESSENT);



	return __cookie_v6_init_sequence(iph, th, mssp);

}