[DCCP]: make <linux/dccp.h> include-able from userspace

The protocol header files in <linux/foo.h> are usually structured in a
way to be included by userspace code.  The top section consists of
general protocol structure definitions, typedefs, enums - followed by
an #ifdef __KERNEL__ section.

Currently <linux/dccp.h> doesn't follow that convention and can
therefore not be used from userspace.  However, for example iptables'
libipt_dccp.c actually needs various definitions from there.

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 121 insertions, 117 deletions

diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index e3b4bf7346bb..add4908b8e57 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -1,16 +1,8 @@
 #ifndef _LINUX_DCCP_H
 #define _LINUX_DCCP_H
 
-#include <linux/in.h>
-#include <linux/list.h>
 #include <linux/types.h>
-#include <linux/uio.h>
-#include <linux/workqueue.h>
-
-#include <net/inet_connection_sock.h>
-#include <net/sock.h>
-#include <net/tcp_states.h>
-#include <net/tcp.h>
+#include <asm/byteorder.h>
 
 /* FIXME: this is utterly wrong */
 struct sockaddr_dccp {
@@ -18,40 +10,6 @@ struct sockaddr_dccp {
         unsigned int            service;
 };
 
-enum dccp_state {
-        DCCP_OPEN       = TCP_ESTABLISHED,
-        DCCP_REQUESTING = TCP_SYN_SENT,
-        DCCP_PARTOPEN   = TCP_FIN_WAIT1, /* FIXME:
-                                            This mapping is horrible, but TCP has
-                                            no matching state for DCCP_PARTOPEN,
-                                            as TCP_SYN_RECV is already used by
-                                            DCCP_RESPOND, why don't stop using TCP
-                                            mapping of states? OK, now we don't use
-                                            sk_stream_sendmsg anymore, so doesn't
-                                            seem to exist any reason for us to
-                                            do the TCP mapping here */
-        DCCP_LISTEN     = TCP_LISTEN,
-        DCCP_RESPOND    = TCP_SYN_RECV,
-        DCCP_CLOSING    = TCP_CLOSING,
-        DCCP_TIME_WAIT  = TCP_TIME_WAIT,
-        DCCP_CLOSED     = TCP_CLOSE,
-        DCCP_MAX_STATES = TCP_MAX_STATES,
-};
-
-#define DCCP_STATE_MASK 0xf
-#define DCCP_ACTION_FIN (1<<7)
-
-enum {
-        DCCPF_OPEN       = TCPF_ESTABLISHED,
-        DCCPF_REQUESTING = TCPF_SYN_SENT,
-        DCCPF_PARTOPEN   = TCPF_FIN_WAIT1,
-        DCCPF_LISTEN     = TCPF_LISTEN,
-        DCCPF_RESPOND    = TCPF_SYN_RECV,
-        DCCPF_CLOSING    = TCPF_CLOSING,
-        DCCPF_TIME_WAIT  = TCPF_TIME_WAIT,
-        DCCPF_CLOSED     = TCPF_CLOSE,
-};
-
 /**
  * struct dccp_hdr - generic part of DCCP packet header
  *
@@ -94,11 +52,6 @@ struct dccp_hdr {
 #endif
 };
 
-static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
-{
-        return (struct dccp_hdr *)skb->h.raw;
-}
-
 /**
  * struct dccp_hdr_ext - the low bits of a 48 bit seq packet
  *
@@ -108,34 +61,6 @@ struct dccp_hdr_ext {
         __u32   dccph_seq_low;
 };
 
-static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
-{
-        return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
-}
-
-static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
-{
-        const struct dccp_hdr *dh = dccp_hdr(skb);
-        return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
-}
-
-static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
-{
-        const struct dccp_hdr *dh = dccp_hdr(skb);
-#if defined(__LITTLE_ENDIAN_BITFIELD)
-        __u64 seq_nr = ntohl(dh->dccph_seq << 8);
-#elif defined(__BIG_ENDIAN_BITFIELD)
-        __u64 seq_nr = ntohl(dh->dccph_seq);
-#else
-#error  "Adjust your <asm/byteorder.h> defines"
-#endif
-
-        if (dh->dccph_x != 0)
-                seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
-
-        return seq_nr;
-}
-
 /**
  * struct dccp_hdr_request - Conection initiation request header
  *
@@ -145,12 +70,6 @@ static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
 struct dccp_hdr_request {
         __u32   dccph_req_service;
 };
-
-static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
-{
-        return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
-}
-
 /**
  * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
  *
@@ -162,24 +81,6 @@ struct dccp_hdr_ack_bits {
                 dccph_ack_nr_high:24;
         __u32   dccph_ack_nr_low;
 };
-
-static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
-{
-        return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
-}
-
-static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
-{
-        const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
-#if defined(__LITTLE_ENDIAN_BITFIELD)
-        return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
-#elif defined(__BIG_ENDIAN_BITFIELD)
-        return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
-#else
-#error  "Adjust your <asm/byteorder.h> defines"
-#endif
-}
-
 /**
  * struct dccp_hdr_response - Conection initiation response header
  *
@@ -193,11 +94,6 @@ struct dccp_hdr_response {
         __u32                           dccph_resp_service;
 };
 
-static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
-{
-        return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
-}
-
 /**
  * struct dccp_hdr_reset - Unconditionally shut down a connection
  *
@@ -210,11 +106,6 @@ struct dccp_hdr_reset {
                                         dccph_reset_data[3];
 };
 
-static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
-{
-        return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
-}
-
 enum dccp_pkt_type {
         DCCP_PKT_REQUEST = 0,
         DCCP_PKT_RESPONSE,
@@ -248,13 +139,6 @@ static inline unsigned int dccp_packet_hdr_len(const __u8 type)
                 return sizeof(struct dccp_hdr_response);
         return sizeof(struct dccp_hdr_reset);
 }
-
-static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
-{
-        return dccp_basic_hdr_len(skb) +
-               dccp_packet_hdr_len(dccp_hdr(skb)->dccph_type);
-}
-
 enum dccp_reset_codes {
         DCCP_RESET_CODE_UNSPECIFIED = 0,
         DCCP_RESET_CODE_CLOSED,
@@ -298,6 +182,124 @@ enum {
         DCCPF_MAX_CCID_SPECIFIC = 255,
 };
 
+#ifdef __KERNEL__
+
+#include <linux/in.h>
+#include <linux/list.h>
+#include <linux/uio.h>
+#include <linux/workqueue.h>
+
+#include <net/inet_connection_sock.h>
+#include <net/sock.h>
+#include <net/tcp_states.h>
+#include <net/tcp.h>
+
+enum dccp_state {
+        DCCP_OPEN       = TCP_ESTABLISHED,
+        DCCP_REQUESTING = TCP_SYN_SENT,
+        DCCP_PARTOPEN   = TCP_FIN_WAIT1, /* FIXME:
+                                            This mapping is horrible, but TCP has
+                                            no matching state for DCCP_PARTOPEN,
+                                            as TCP_SYN_RECV is already used by
+                                            DCCP_RESPOND, why don't stop using TCP
+                                            mapping of states? OK, now we don't use
+                                            sk_stream_sendmsg anymore, so doesn't
+                                            seem to exist any reason for us to
+                                            do the TCP mapping here */
+        DCCP_LISTEN     = TCP_LISTEN,
+        DCCP_RESPOND    = TCP_SYN_RECV,
+        DCCP_CLOSING    = TCP_CLOSING,
+        DCCP_TIME_WAIT  = TCP_TIME_WAIT,
+        DCCP_CLOSED     = TCP_CLOSE,
+        DCCP_MAX_STATES = TCP_MAX_STATES,
+};
+
+#define DCCP_STATE_MASK 0xf
+#define DCCP_ACTION_FIN (1<<7)
+
+enum {
+        DCCPF_OPEN       = TCPF_ESTABLISHED,
+        DCCPF_REQUESTING = TCPF_SYN_SENT,
+        DCCPF_PARTOPEN   = TCPF_FIN_WAIT1,
+        DCCPF_LISTEN     = TCPF_LISTEN,
+        DCCPF_RESPOND    = TCPF_SYN_RECV,
+        DCCPF_CLOSING    = TCPF_CLOSING,
+        DCCPF_TIME_WAIT  = TCPF_TIME_WAIT,
+        DCCPF_CLOSED     = TCPF_CLOSE,
+};
+
+static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
+{
+        return (struct dccp_hdr *)skb->h.raw;
+}
+
+static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
+{
+        return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
+}
+
+static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
+{
+        const struct dccp_hdr *dh = dccp_hdr(skb);
+        return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
+}
+
+static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
+{
+        const struct dccp_hdr *dh = dccp_hdr(skb);
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+        __u64 seq_nr = ntohl(dh->dccph_seq << 8);
+#elif defined(__BIG_ENDIAN_BITFIELD)
+        __u64 seq_nr = ntohl(dh->dccph_seq);
+#else
+#error  "Adjust your <asm/byteorder.h> defines"
+#endif
+
+        if (dh->dccph_x != 0)
+                seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
+
+        return seq_nr;
+}
+
+static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
+{
+        return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
+}
+
+static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
+{
+        return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
+}
+
+static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
+{
+        const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+        return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
+#elif defined(__BIG_ENDIAN_BITFIELD)
+        return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
+#else
+#error  "Adjust your <asm/byteorder.h> defines"
+#endif
+}
+
+static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
+{
+        return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
+}
+
+static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
+{
+        return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
+}
+
+static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
+{
+        return dccp_basic_hdr_len(skb) +
+               dccp_packet_hdr_len(dccp_hdr(skb)->dccph_type);
+}
+
+
 /* initial values for each feature */
 #define DCCPF_INITIAL_SEQUENCE_WINDOW           100
 /* FIXME: for now we're using CCID 3 (TFRC) */
@@ -429,4 +431,6 @@ static inline const char *dccp_role(const struct sock *sk)
         return NULL;
 }
 
+#endif /* __KERNEL__ */
+
 #endif /* _LINUX_DCCP_H */