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Commit cfb6eeb4 authored by YOSHIFUJI Hideaki's avatar YOSHIFUJI Hideaki Committed by David S. Miller
Browse files

[TCP]: MD5 Signature Option (RFC2385) support. 



Based on implementation by Rick Payne.

Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bf6bce71

CREDITS

+3 −0
Original line number Diff line number Diff line
@@ -2598,6 +2598,9 @@ S: Ucitelska 1576 
S: Prague 8

S: 182 00 Czech Republic



N: Rick Payne

D: RFC2385 Support for TCP



N: Barak A. Pearlmutter

E: bap@cs.unm.edu

W: http://www.cs.unm.edu/~bap/

include/linux/tcp.h

+32 −3
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 


#include <linux/types.h>

#include <asm/byteorder.h>

#include <linux/socket.h>



struct tcphdr {

	__be16	source;
@@ -94,6 +95,7 @@ enum { 
#define TCP_INFO		11	/* Information about this connection. */

#define TCP_QUICKACK		12	/* Block/reenable quick acks */

#define TCP_CONGESTION		13	/* Congestion control algorithm */

#define TCP_MD5SIG		14	/* TCP MD5 Signature (RFC2385) */



#define TCPI_OPT_TIMESTAMPS	1

#define TCPI_OPT_SACK		2
@@ -157,6 +159,17 @@ struct tcp_info 
	__u32	tcpi_total_retrans;

};



/* for TCP_MD5SIG socket option */

#define TCP_MD5SIG_MAXKEYLEN	80



struct tcp_md5sig {

	struct __kernel_sockaddr_storage tcpm_addr;	/* address associated */

	__u16	__tcpm_pad1;				/* zero */

	__u16	tcpm_keylen;				/* key length */

	__u32	__tcpm_pad2;				/* zero */

	__u8	tcpm_key[TCP_MD5SIG_MAXKEYLEN];		/* key (binary) */

};



#ifdef __KERNEL__



#include <linux/skbuff.h>
@@ -198,6 +211,10 @@ struct tcp_options_received { 


struct tcp_request_sock {

	struct inet_request_sock 	req;

#ifdef CONFIG_TCP_MD5SIG

	/* Only used by TCP MD5 Signature so far. */

	struct tcp_request_sock_ops	*af_specific;

#endif

	__u32			 	rcv_isn;

	__u32			 	snt_isn;

};
@@ -363,6 +380,14 @@ struct tcp_sock { 
		__u32		  probe_seq_start;

		__u32		  probe_seq_end;

	} mtu_probe;



#ifdef CONFIG_TCP_MD5SIG

/* TCP AF-Specific parts; only used by MD5 Signature support so far */

	struct tcp_sock_af_ops	*af_specific;



/* TCP MD5 Signagure Option information */

	struct tcp_md5sig_info	*md5sig_info;

#endif

};



static inline struct tcp_sock *tcp_sk(const struct sock *sk)
@@ -377,6 +402,10 @@ struct tcp_timewait_sock { 
	__u32			  tw_rcv_wnd;

	__u32			  tw_ts_recent;

	long			  tw_ts_recent_stamp;

#ifdef CONFIG_TCP_MD5SIG

	__u16			  tw_md5_keylen;

	__u8			  tw_md5_key[TCP_MD5SIG_MAXKEYLEN];

#endif

};



static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk)

include/net/request_sock.h

+2 −1
Original line number Diff line number Diff line
@@ -35,7 +35,8 @@ struct request_sock_ops { 
				       struct dst_entry *dst);

	void		(*send_ack)(struct sk_buff *skb,

				    struct request_sock *req);

	void		(*send_reset)(struct sk_buff *skb);

	void		(*send_reset)(struct sock *sk,

				      struct sk_buff *skb);

	void		(*destructor)(struct request_sock *req);

};

include/net/tcp.h

+143 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <linux/percpu.h>

#include <linux/skbuff.h>

#include <linux/dmaengine.h>

#include <linux/crypto.h>



#include <net/inet_connection_sock.h>

#include <net/inet_timewait_sock.h>
@@ -161,6 +162,7 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo); 
#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
@@ -170,6 +172,7 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo); 
#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
@@ -178,6 +181,7 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo); 
#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 */
@@ -299,6 +303,8 @@ extern void tcp_cleanup_rbuf(struct sock *sk, int copied); 
extern int			tcp_twsk_unique(struct sock *sk,

						struct sock *sktw, void *twp);



extern void			tcp_twsk_destructor(struct sock *sk);



static inline void tcp_dec_quickack_mode(struct sock *sk,

					 const unsigned int pkts)

{
@@ -1064,6 +1070,114 @@ static inline void clear_all_retrans_hints(struct tcp_sock *tp){ 
	tp->fastpath_skb_hint = NULL;

}



/* MD5 Signature */

struct crypto_hash;



/* - key database */

struct tcp_md5sig_key {

	u8			*key;

	u8			keylen;

};



struct tcp4_md5sig_key {

	u8			*key;

	u16			keylen;

	__be32			addr;

};



struct tcp6_md5sig_key {

	u8			*key;

	u16			keylen;

#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_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,

						     int protocol, 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,

						  u32 addr);



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();

}



/* /proc */

enum tcp_seq_states {

	TCP_SEQ_STATE_LISTENING,
@@ -1103,6 +1217,35 @@ extern int tcp4_proc_init(void); 
extern void tcp4_proc_exit(void);

#endif



/* 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,

						  int protocol, 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(struct net_proto_family *ops);

extern void tcp_init(void);

include/net/timewait_sock.h

+3 −0
Original line number Diff line number Diff line
@@ -31,6 +31,9 @@ static inline int twsk_unique(struct sock *sk, struct sock *sktw, void *twp) 


static inline void twsk_destructor(struct sock *sk)

{

	BUG_ON(sk == NULL);

	BUG_ON(sk->sk_prot == NULL);

	BUG_ON(sk->sk_prot->twsk_prot == NULL);

	if (sk->sk_prot->twsk_prot->twsk_destructor != NULL)

		sk->sk_prot->twsk_prot->twsk_destructor(sk);

}