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[DCCP]: Prepare the AF agnostic core for the introduction of DCCPv6

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Basically exports a similar set of functions as the one exported by
the non-AF specific TCP code.

In the process moved some non-AF specific code from dccp_v4_connect to
dccp_connect_init and moved the checksum verification from
dccp_invalid_packet to dccp_v4_rcv, so as to use it in dccp_v6_rcv
too.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo 2005-12-13 23:24:16 -08:00 committed by David S. Miller
parent 34ca686081
commit f21e68caa0
6 changed files with 114 additions and 52 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
net/dccp/dccp.h
View File

@ -228,6 +228,9 @@ extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
const struct dccp_hdr *dh, const unsigned len);
extern int dccp_v4_init_sock(struct sock *sk);
extern int dccp_v4_destroy_sock(struct sock *sk);
extern void dccp_close(struct sock *sk, long timeout);
extern struct sk_buff *dccp_make_response(struct sock *sk,
struct dst_entry *dst,
@ -238,6 +241,7 @@ extern struct sk_buff *dccp_make_reset(struct sock *sk,
extern int dccp_connect(struct sock *sk);
extern int dccp_disconnect(struct sock *sk, int flags);
extern void dccp_unhash(struct sock *sk);
extern int dccp_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen);
extern int dccp_setsockopt(struct sock *sk, int level, int optname,
@ -249,6 +253,13 @@ extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
struct msghdr *msg, size_t len, int nonblock,
int flags, int *addr_len);
extern void dccp_shutdown(struct sock *sk, int how);
extern int inet_dccp_listen(struct socket *sock, int backlog);
extern unsigned int dccp_poll(struct file *file, struct socket *sock,
poll_table *wait);
extern void dccp_v4_send_check(struct sock *sk, int len,
struct sk_buff *skb);
extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
int addr_len);
extern int dccp_v4_checksum(const struct sk_buff *skb,
const u32 saddr, const u32 daddr);
@ -256,6 +267,17 @@ extern int dccp_v4_checksum(const struct sk_buff *skb,
extern int dccp_v4_send_reset(struct sock *sk,
enum dccp_reset_codes code);
extern void dccp_send_close(struct sock *sk, const int active);
extern int dccp_invalid_packet(struct sk_buff *skb);
static inline int dccp_bad_service_code(const struct sock *sk,
const __u32 service)
{
const struct dccp_sock *dp = dccp_sk(sk);
if (dp->dccps_service == service)
return 0;
return !dccp_list_has_service(dp->dccps_service_list, service);
}
struct dccp_skb_cb {
__u8 dccpd_type:4;

4
net/dccp/input.c
View File

@ -250,6 +250,8 @@ discard:
return 0;
}
EXPORT_SYMBOL_GPL(dccp_rcv_established);
static int dccp_rcv_request_sent_state_process(struct sock *sk,
struct sk_buff *skb,
const struct dccp_hdr *dh,
@ -567,3 +569,5 @@ discard:
}
return 0;
}
EXPORT_SYMBOL_GPL(dccp_rcv_state_process);

73
net/dccp/ipv4.c
View File

@ -46,11 +46,13 @@ static void dccp_v4_hash(struct sock *sk)
inet_hash(&dccp_hashinfo, sk);
}
static void dccp_v4_unhash(struct sock *sk)
void dccp_unhash(struct sock *sk)
{
inet_unhash(&dccp_hashinfo, sk);
}
EXPORT_SYMBOL_GPL(dccp_unhash);
/* called with local bh disabled */
static int __dccp_v4_check_established(struct sock *sk, const __u16 lport,
struct inet_timewait_sock **twp)
@ -209,8 +211,7 @@ out:
}
}
static int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
int addr_len)
int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
struct inet_sock *inet = inet_sk(sk);
struct dccp_sock *dp = dccp_sk(sk);
@ -288,16 +289,6 @@ static int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
usin->sin_port);
dccp_update_gss(sk, dp->dccps_iss);
/*
* SWL and AWL are initially adjusted so that they are not less than
* the initial Sequence Numbers received and sent, respectively:
* SWL := max(GSR + 1 - floor(W/4), ISR),
* AWL := max(GSS - W' + 1, ISS).
* These adjustments MUST be applied only at the beginning of the
* connection.
*/
dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss));
inet->id = dp->dccps_iss ^ jiffies;
err = dccp_connect(sk);
@ -317,6 +308,8 @@ failure:
goto out;
}
EXPORT_SYMBOL_GPL(dccp_v4_connect);
/*
* This routine does path mtu discovery as defined in RFC1191.
*/
@ -608,7 +601,7 @@ out:
}
/* This routine computes an IPv4 DCCP checksum. */
static void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb)
void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb)
{
const struct inet_sock *inet = inet_sk(sk);
struct dccp_hdr *dh = dccp_hdr(skb);
@ -616,6 +609,8 @@ static void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb)
dh->dccph_checksum = dccp_v4_checksum(skb, inet->saddr, inet->daddr);
}
EXPORT_SYMBOL_GPL(dccp_v4_send_check);
int dccp_v4_send_reset(struct sock *sk, enum dccp_reset_codes code)
{
struct sk_buff *skb;
@ -651,16 +646,6 @@ static inline u64 dccp_v4_init_sequence(const struct sock *sk,
dccp_hdr(skb)->dccph_sport);
}
static inline int dccp_bad_service_code(const struct sock *sk,
const __u32 service)
{
const struct dccp_sock *dp = dccp_sk(sk);
if (dp->dccps_service == service)
return 0;
return !dccp_list_has_service(dp->dccps_service_list, service);
}
int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
{
struct inet_request_sock *ireq;
@ -672,7 +657,6 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
const __u32 service = dccp_hdr_request(skb)->dccph_req_service;
struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
__u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
struct dst_entry *dst = NULL;
/* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */
if (((struct rtable *)skb->dst)->rt_flags &
@ -713,7 +697,6 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
ireq = inet_rsk(req);
ireq->loc_addr = daddr;
ireq->rmt_addr = saddr;
/* FIXME: Merge Aristeu's option parsing code when ready */
req->rcv_wnd = 100; /* Fake, option parsing will get the
right value */
ireq->opt = NULL;
@ -731,7 +714,7 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
dreq->dreq_iss = dccp_v4_init_sequence(sk, skb);
dreq->dreq_service = service;
if (dccp_v4_send_response(sk, req, dst))
if (dccp_v4_send_response(sk, req, NULL))
goto drop_and_free;
inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
@ -748,6 +731,8 @@ drop:
return -1;
}
EXPORT_SYMBOL_GPL(dccp_v4_conn_request);
/*
* The three way handshake has completed - we got a valid ACK or DATAACK -
* now create the new socket.
@ -802,6 +787,8 @@ exit:
return NULL;
}
EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock);
static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
{
const struct dccp_hdr *dh = dccp_hdr(skb);
@ -1021,7 +1008,9 @@ discard:
return 0;
}
static inline int dccp_invalid_packet(struct sk_buff *skb)
EXPORT_SYMBOL_GPL(dccp_v4_do_rcv);
int dccp_invalid_packet(struct sk_buff *skb)
{
const struct dccp_hdr *dh;
@ -1075,17 +1064,11 @@ static inline int dccp_invalid_packet(struct sk_buff *skb)
return 1;
}
/* If the header checksum is incorrect, drop packet and return */
if (dccp_v4_verify_checksum(skb, skb->nh.iph->saddr,
skb->nh.iph->daddr) < 0) {
LIMIT_NETDEBUG(KERN_WARNING "DCCP: header checksum is "
"incorrect\n");
return 1;
}
return 0;
}
EXPORT_SYMBOL_GPL(dccp_invalid_packet);
/* this is called when real data arrives */
int dccp_v4_rcv(struct sk_buff *skb)
{
@ -1098,6 +1081,14 @@ int dccp_v4_rcv(struct sk_buff *skb)
if (dccp_invalid_packet(skb))
goto discard_it;
/* If the header checksum is incorrect, drop packet and return */
if (dccp_v4_verify_checksum(skb, skb->nh.iph->saddr,
skb->nh.iph->daddr) < 0) {
LIMIT_NETDEBUG(KERN_WARNING "%s: incorrect header checksum\n",
__FUNCTION__);
goto discard_it;
}
dh = dccp_hdr(skb);
DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb);
@ -1217,7 +1208,7 @@ struct inet_connection_sock_af_ops dccp_ipv4_af_ops = {
.sockaddr_len = sizeof(struct sockaddr_in),
};
static int dccp_v4_init_sock(struct sock *sk)
int dccp_v4_init_sock(struct sock *sk)
{
struct dccp_sock *dp = dccp_sk(sk);
static int dccp_ctl_socket_init = 1;
@ -1270,7 +1261,9 @@ static int dccp_v4_init_sock(struct sock *sk)
return 0;
}
static int dccp_v4_destroy_sock(struct sock *sk)
EXPORT_SYMBOL_GPL(dccp_v4_init_sock);
int dccp_v4_destroy_sock(struct sock *sk)
{
struct dccp_sock *dp = dccp_sk(sk);
@ -1303,6 +1296,8 @@ static int dccp_v4_destroy_sock(struct sock *sk)
return 0;
}
EXPORT_SYMBOL_GPL(dccp_v4_destroy_sock);
static void dccp_v4_reqsk_destructor(struct request_sock *req)
{
kfree(inet_rsk(req)->opt);
@ -1331,7 +1326,7 @@ struct proto dccp_prot = {
.recvmsg = dccp_recvmsg,
.backlog_rcv = dccp_v4_do_rcv,
.hash = dccp_v4_hash,
.unhash = dccp_v4_unhash,
.unhash = dccp_unhash,
.accept = inet_csk_accept,
.get_port = dccp_v4_get_port,
.shutdown = dccp_shutdown,

8
net/dccp/minisocks.c
View File

@ -40,6 +40,8 @@ struct inet_timewait_death_row dccp_death_row = {
(unsigned long)&dccp_death_row),
};
EXPORT_SYMBOL_GPL(dccp_death_row);
void dccp_time_wait(struct sock *sk, int state, int timeo)
{
struct inet_timewait_sock *tw = NULL;
@ -170,6 +172,8 @@ out_free:
return newsk;
}
EXPORT_SYMBOL_GPL(dccp_create_openreq_child);
/*
* Process an incoming packet for RESPOND sockets represented
* as an request_sock.
@ -236,6 +240,8 @@ drop:
goto out;
}
EXPORT_SYMBOL_GPL(dccp_check_req);
/*
* Queue segment on the new socket if the new socket is active,
* otherwise we just shortcircuit this and continue with
@ -266,3 +272,5 @@ int dccp_child_process(struct sock *parent, struct sock *child,
sock_put(child);
return ret;
}
EXPORT_SYMBOL_GPL(dccp_child_process);

27
net/dccp/output.c
View File

@ -135,12 +135,6 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu)
{
struct dccp_sock *dp = dccp_sk(sk);
/*
* FIXME: we really should be using the af_specific thing to support
* IPv6.
* mss_now = pmtu - tp->af_specific->net_header_len -
* sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext);
*/
int mss_now = (pmtu - inet_csk(sk)->icsk_af_ops->net_header_len -
sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext));
@ -164,6 +158,8 @@ unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu)
return mss_now;
}
EXPORT_SYMBOL_GPL(dccp_sync_mss);
void dccp_write_space(struct sock *sk)
{
read_lock(&sk->sk_callback_lock);
@ -319,6 +315,8 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
return skb;
}
EXPORT_SYMBOL_GPL(dccp_make_response);
struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
const enum dccp_reset_codes code)
@ -375,6 +373,7 @@ struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
*/
static inline void dccp_connect_init(struct sock *sk)
{
struct dccp_sock *dp = dccp_sk(sk);
struct dst_entry *dst = __sk_dst_get(sk);
struct inet_connection_sock *icsk = inet_csk(sk);
@ -383,10 +382,16 @@ static inline void dccp_connect_init(struct sock *sk)
dccp_sync_mss(sk, dst_mtu(dst));
/*
* FIXME: set dp->{dccps_swh,dccps_swl}, with
* something like dccp_inc_seq
*/
dccp_update_gss(sk, dp->dccps_iss);
/*
* SWL and AWL are initially adjusted so that they are not less than
* the initial Sequence Numbers received and sent, respectively:
* SWL := max(GSR + 1 - floor(W/4), ISR),
* AWL := max(GSS - W' + 1, ISS).
* These adjustments MUST be applied only at the beginning of the
* connection.
*/
dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss));
icsk->icsk_retransmits = 0;
}
@ -418,6 +423,8 @@ int dccp_connect(struct sock *sk)
return 0;
}
EXPORT_SYMBOL_GPL(dccp_connect);
void dccp_send_ack(struct sock *sk)
{
/* If we have been reset, we may not send again. */

32
net/dccp/proto.c
View File

@ -41,8 +41,12 @@
DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly;
EXPORT_SYMBOL_GPL(dccp_statistics);
atomic_t dccp_orphan_count = ATOMIC_INIT(0);
EXPORT_SYMBOL_GPL(dccp_orphan_count);
static struct net_protocol dccp_protocol = {
.handler = dccp_v4_rcv,
.err_handler = dccp_v4_err,
@ -149,6 +153,8 @@ int dccp_disconnect(struct sock *sk, int flags)
return err;
}
EXPORT_SYMBOL_GPL(dccp_disconnect);
/*
* Wait for a DCCP event.
*
@ -156,8 +162,8 @@ int dccp_disconnect(struct sock *sk, int flags)
* take care of normal races (between the test and the event) and we don't
* go look at any of the socket buffers directly.
*/
static unsigned int dccp_poll(struct file *file, struct socket *sock,
poll_table *wait)
unsigned int dccp_poll(struct file *file, struct socket *sock,
poll_table *wait)
{
unsigned int mask;
struct sock *sk = sock->sk;
@ -205,12 +211,16 @@ static unsigned int dccp_poll(struct file *file, struct socket *sock,
return mask;
}
EXPORT_SYMBOL_GPL(dccp_poll);
int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg)
{
dccp_pr_debug("entry\n");
return -ENOIOCTLCMD;
}
EXPORT_SYMBOL_GPL(dccp_ioctl);
static int dccp_setsockopt_service(struct sock *sk, const u32 service,
char __user *optval, int optlen)
{
@ -284,6 +294,8 @@ int dccp_setsockopt(struct sock *sk, int level, int optname,
return err;
}
EXPORT_SYMBOL_GPL(dccp_setsockopt);
static int dccp_getsockopt_service(struct sock *sk, int len,
u32 __user *optval,
int __user *optlen)
@ -357,6 +369,8 @@ int dccp_getsockopt(struct sock *sk, int level, int optname,
return 0;
}
EXPORT_SYMBOL_GPL(dccp_getsockopt);
int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
size_t len)
{
@ -413,6 +427,8 @@ out_discard:
goto out_release;
}
EXPORT_SYMBOL_GPL(dccp_sendmsg);
int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
size_t len, int nonblock, int flags, int *addr_len)
{
@ -510,7 +526,9 @@ out:
return len;
}
static int inet_dccp_listen(struct socket *sock, int backlog)
EXPORT_SYMBOL_GPL(dccp_recvmsg);
int inet_dccp_listen(struct socket *sock, int backlog)
{
struct sock *sk = sock->sk;
unsigned char old_state;
@ -546,6 +564,8 @@ out:
return err;
}
EXPORT_SYMBOL_GPL(inet_dccp_listen);
static const unsigned char dccp_new_state[] = {
/* current state: new state: action: */
[0] = DCCP_CLOSED,
@ -651,11 +671,15 @@ adjudge_to_death:
sock_put(sk);
}
EXPORT_SYMBOL_GPL(dccp_close);
void dccp_shutdown(struct sock *sk, int how)
{
dccp_pr_debug("entry\n");
}
EXPORT_SYMBOL_GPL(dccp_shutdown);
static struct proto_ops inet_dccp_ops = {
.family = PF_INET,
.owner = THIS_MODULE,
@ -763,6 +787,8 @@ MODULE_PARM_DESC(thash_entries, "Number of ehash buckets");
int dccp_debug;
module_param(dccp_debug, int, 0444);
MODULE_PARM_DESC(dccp_debug, "Enable debug messages");
EXPORT_SYMBOL_GPL(dccp_debug);
#endif
static int __init dccp_init(void)