[DCCP]: Prepare the AF agnostic core for the introduction of DCCPv6
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
David S. Miller
parent
34ca686081
commit
f21e68caa0
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@ -228,6 +228,9 @@ extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
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extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
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const struct dccp_hdr *dh, const unsigned len);
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extern int dccp_v4_init_sock(struct sock *sk);
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extern int dccp_v4_destroy_sock(struct sock *sk);
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extern void dccp_close(struct sock *sk, long timeout);
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extern struct sk_buff *dccp_make_response(struct sock *sk,
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struct dst_entry *dst,
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@ -238,6 +241,7 @@ extern struct sk_buff *dccp_make_reset(struct sock *sk,
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extern int dccp_connect(struct sock *sk);
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extern int dccp_disconnect(struct sock *sk, int flags);
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extern void dccp_unhash(struct sock *sk);
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extern int dccp_getsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int __user *optlen);
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extern int dccp_setsockopt(struct sock *sk, int level, int optname,
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@ -249,6 +253,13 @@ extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg, size_t len, int nonblock,
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int flags, int *addr_len);
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extern void dccp_shutdown(struct sock *sk, int how);
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extern int inet_dccp_listen(struct socket *sock, int backlog);
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extern unsigned int dccp_poll(struct file *file, struct socket *sock,
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poll_table *wait);
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extern void dccp_v4_send_check(struct sock *sk, int len,
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struct sk_buff *skb);
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extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
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int addr_len);
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extern int dccp_v4_checksum(const struct sk_buff *skb,
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const u32 saddr, const u32 daddr);
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@ -256,6 +267,17 @@ extern int dccp_v4_checksum(const struct sk_buff *skb,
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extern int dccp_v4_send_reset(struct sock *sk,
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enum dccp_reset_codes code);
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extern void dccp_send_close(struct sock *sk, const int active);
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extern int dccp_invalid_packet(struct sk_buff *skb);
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static inline int dccp_bad_service_code(const struct sock *sk,
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const __u32 service)
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{
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const struct dccp_sock *dp = dccp_sk(sk);
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if (dp->dccps_service == service)
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return 0;
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return !dccp_list_has_service(dp->dccps_service_list, service);
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}
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struct dccp_skb_cb {
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__u8 dccpd_type:4;
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@ -250,6 +250,8 @@ discard:
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return 0;
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}
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EXPORT_SYMBOL_GPL(dccp_rcv_established);
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static int dccp_rcv_request_sent_state_process(struct sock *sk,
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struct sk_buff *skb,
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const struct dccp_hdr *dh,
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@ -567,3 +569,5 @@ discard:
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(dccp_rcv_state_process);
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@ -46,11 +46,13 @@ static void dccp_v4_hash(struct sock *sk)
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inet_hash(&dccp_hashinfo, sk);
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}
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static void dccp_v4_unhash(struct sock *sk)
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void dccp_unhash(struct sock *sk)
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{
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inet_unhash(&dccp_hashinfo, sk);
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}
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EXPORT_SYMBOL_GPL(dccp_unhash);
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/* called with local bh disabled */
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static int __dccp_v4_check_established(struct sock *sk, const __u16 lport,
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struct inet_timewait_sock **twp)
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@ -209,8 +211,7 @@ out:
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}
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}
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static int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
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int addr_len)
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int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct dccp_sock *dp = dccp_sk(sk);
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@ -288,16 +289,6 @@ static int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
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usin->sin_port);
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dccp_update_gss(sk, dp->dccps_iss);
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/*
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* SWL and AWL are initially adjusted so that they are not less than
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* the initial Sequence Numbers received and sent, respectively:
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* SWL := max(GSR + 1 - floor(W/4), ISR),
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* AWL := max(GSS - W' + 1, ISS).
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* These adjustments MUST be applied only at the beginning of the
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* connection.
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*/
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dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss));
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inet->id = dp->dccps_iss ^ jiffies;
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err = dccp_connect(sk);
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@ -317,6 +308,8 @@ failure:
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goto out;
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}
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EXPORT_SYMBOL_GPL(dccp_v4_connect);
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/*
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* This routine does path mtu discovery as defined in RFC1191.
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*/
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@ -608,7 +601,7 @@ out:
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}
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/* This routine computes an IPv4 DCCP checksum. */
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static void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb)
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void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb)
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{
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const struct inet_sock *inet = inet_sk(sk);
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struct dccp_hdr *dh = dccp_hdr(skb);
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@ -616,6 +609,8 @@ static void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb)
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dh->dccph_checksum = dccp_v4_checksum(skb, inet->saddr, inet->daddr);
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}
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EXPORT_SYMBOL_GPL(dccp_v4_send_check);
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int dccp_v4_send_reset(struct sock *sk, enum dccp_reset_codes code)
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{
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struct sk_buff *skb;
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@ -651,16 +646,6 @@ static inline u64 dccp_v4_init_sequence(const struct sock *sk,
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dccp_hdr(skb)->dccph_sport);
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}
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static inline int dccp_bad_service_code(const struct sock *sk,
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const __u32 service)
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{
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const struct dccp_sock *dp = dccp_sk(sk);
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if (dp->dccps_service == service)
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return 0;
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return !dccp_list_has_service(dp->dccps_service_list, service);
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}
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int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
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{
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struct inet_request_sock *ireq;
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@ -672,7 +657,6 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
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const __u32 service = dccp_hdr_request(skb)->dccph_req_service;
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struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
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__u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
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struct dst_entry *dst = NULL;
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/* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */
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if (((struct rtable *)skb->dst)->rt_flags &
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@ -713,7 +697,6 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
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ireq = inet_rsk(req);
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ireq->loc_addr = daddr;
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ireq->rmt_addr = saddr;
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/* FIXME: Merge Aristeu's option parsing code when ready */
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req->rcv_wnd = 100; /* Fake, option parsing will get the
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right value */
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ireq->opt = NULL;
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@ -731,7 +714,7 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
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dreq->dreq_iss = dccp_v4_init_sequence(sk, skb);
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dreq->dreq_service = service;
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if (dccp_v4_send_response(sk, req, dst))
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if (dccp_v4_send_response(sk, req, NULL))
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goto drop_and_free;
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inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
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@ -748,6 +731,8 @@ drop:
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return -1;
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}
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EXPORT_SYMBOL_GPL(dccp_v4_conn_request);
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/*
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* The three way handshake has completed - we got a valid ACK or DATAACK -
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* now create the new socket.
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@ -802,6 +787,8 @@ exit:
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return NULL;
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}
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EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock);
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static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
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{
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const struct dccp_hdr *dh = dccp_hdr(skb);
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@ -1021,7 +1008,9 @@ discard:
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return 0;
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}
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static inline int dccp_invalid_packet(struct sk_buff *skb)
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EXPORT_SYMBOL_GPL(dccp_v4_do_rcv);
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int dccp_invalid_packet(struct sk_buff *skb)
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{
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const struct dccp_hdr *dh;
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@ -1075,17 +1064,11 @@ static inline int dccp_invalid_packet(struct sk_buff *skb)
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return 1;
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}
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/* If the header checksum is incorrect, drop packet and return */
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if (dccp_v4_verify_checksum(skb, skb->nh.iph->saddr,
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skb->nh.iph->daddr) < 0) {
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LIMIT_NETDEBUG(KERN_WARNING "DCCP: header checksum is "
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"incorrect\n");
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return 1;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(dccp_invalid_packet);
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/* this is called when real data arrives */
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int dccp_v4_rcv(struct sk_buff *skb)
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{
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@ -1098,6 +1081,14 @@ int dccp_v4_rcv(struct sk_buff *skb)
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if (dccp_invalid_packet(skb))
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goto discard_it;
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/* If the header checksum is incorrect, drop packet and return */
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if (dccp_v4_verify_checksum(skb, skb->nh.iph->saddr,
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skb->nh.iph->daddr) < 0) {
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LIMIT_NETDEBUG(KERN_WARNING "%s: incorrect header checksum\n",
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__FUNCTION__);
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goto discard_it;
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}
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dh = dccp_hdr(skb);
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DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb);
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@ -1217,7 +1208,7 @@ struct inet_connection_sock_af_ops dccp_ipv4_af_ops = {
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.sockaddr_len = sizeof(struct sockaddr_in),
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};
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static int dccp_v4_init_sock(struct sock *sk)
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int dccp_v4_init_sock(struct sock *sk)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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static int dccp_ctl_socket_init = 1;
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@ -1270,7 +1261,9 @@ static int dccp_v4_init_sock(struct sock *sk)
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return 0;
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}
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static int dccp_v4_destroy_sock(struct sock *sk)
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EXPORT_SYMBOL_GPL(dccp_v4_init_sock);
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int dccp_v4_destroy_sock(struct sock *sk)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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@ -1303,6 +1296,8 @@ static int dccp_v4_destroy_sock(struct sock *sk)
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return 0;
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}
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EXPORT_SYMBOL_GPL(dccp_v4_destroy_sock);
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static void dccp_v4_reqsk_destructor(struct request_sock *req)
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{
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kfree(inet_rsk(req)->opt);
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@ -1331,7 +1326,7 @@ struct proto dccp_prot = {
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.recvmsg = dccp_recvmsg,
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.backlog_rcv = dccp_v4_do_rcv,
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.hash = dccp_v4_hash,
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.unhash = dccp_v4_unhash,
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.unhash = dccp_unhash,
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.accept = inet_csk_accept,
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.get_port = dccp_v4_get_port,
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.shutdown = dccp_shutdown,
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@ -40,6 +40,8 @@ struct inet_timewait_death_row dccp_death_row = {
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(unsigned long)&dccp_death_row),
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};
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EXPORT_SYMBOL_GPL(dccp_death_row);
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void dccp_time_wait(struct sock *sk, int state, int timeo)
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{
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struct inet_timewait_sock *tw = NULL;
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@ -170,6 +172,8 @@ out_free:
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return newsk;
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}
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EXPORT_SYMBOL_GPL(dccp_create_openreq_child);
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/*
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* Process an incoming packet for RESPOND sockets represented
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* as an request_sock.
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@ -236,6 +240,8 @@ drop:
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goto out;
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}
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EXPORT_SYMBOL_GPL(dccp_check_req);
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/*
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* Queue segment on the new socket if the new socket is active,
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* otherwise we just shortcircuit this and continue with
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@ -266,3 +272,5 @@ int dccp_child_process(struct sock *parent, struct sock *child,
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sock_put(child);
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return ret;
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}
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EXPORT_SYMBOL_GPL(dccp_child_process);
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@ -135,12 +135,6 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
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unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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/*
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* FIXME: we really should be using the af_specific thing to support
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* IPv6.
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* mss_now = pmtu - tp->af_specific->net_header_len -
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* sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext);
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*/
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int mss_now = (pmtu - inet_csk(sk)->icsk_af_ops->net_header_len -
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sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext));
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@ -164,6 +158,8 @@ unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu)
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return mss_now;
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}
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EXPORT_SYMBOL_GPL(dccp_sync_mss);
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void dccp_write_space(struct sock *sk)
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{
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read_lock(&sk->sk_callback_lock);
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@ -319,6 +315,8 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
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return skb;
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}
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EXPORT_SYMBOL_GPL(dccp_make_response);
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struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
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const enum dccp_reset_codes code)
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@ -375,6 +373,7 @@ struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
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*/
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static inline void dccp_connect_init(struct sock *sk)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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struct dst_entry *dst = __sk_dst_get(sk);
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struct inet_connection_sock *icsk = inet_csk(sk);
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@ -383,10 +382,16 @@ static inline void dccp_connect_init(struct sock *sk)
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dccp_sync_mss(sk, dst_mtu(dst));
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/*
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* FIXME: set dp->{dccps_swh,dccps_swl}, with
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* something like dccp_inc_seq
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*/
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dccp_update_gss(sk, dp->dccps_iss);
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/*
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* SWL and AWL are initially adjusted so that they are not less than
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* the initial Sequence Numbers received and sent, respectively:
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* SWL := max(GSR + 1 - floor(W/4), ISR),
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* AWL := max(GSS - W' + 1, ISS).
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* These adjustments MUST be applied only at the beginning of the
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* connection.
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*/
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dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss));
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icsk->icsk_retransmits = 0;
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}
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@ -418,6 +423,8 @@ int dccp_connect(struct sock *sk)
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return 0;
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}
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EXPORT_SYMBOL_GPL(dccp_connect);
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void dccp_send_ack(struct sock *sk)
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{
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/* If we have been reset, we may not send again. */
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|
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@ -41,8 +41,12 @@
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DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly;
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EXPORT_SYMBOL_GPL(dccp_statistics);
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atomic_t dccp_orphan_count = ATOMIC_INIT(0);
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EXPORT_SYMBOL_GPL(dccp_orphan_count);
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static struct net_protocol dccp_protocol = {
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.handler = dccp_v4_rcv,
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.err_handler = dccp_v4_err,
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@ -149,6 +153,8 @@ int dccp_disconnect(struct sock *sk, int flags)
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return err;
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}
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|
||||
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)
|
||||
|
|
|
|||
Reference in New Issue