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630 lines
19 KiB
630 lines
19 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* SCTP kernel implementation |
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* (C) Copyright IBM Corp. 2001, 2004 |
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* Copyright (c) 1999-2000 Cisco, Inc. |
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* Copyright (c) 1999-2001 Motorola, Inc. |
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* Copyright (c) 2001-2003 Intel Corp. |
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* |
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* This file is part of the SCTP kernel implementation |
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* |
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* The base lksctp header. |
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* |
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* Please send any bug reports or fixes you make to the |
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* email address(es): |
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* lksctp developers <[email protected]> |
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* |
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* Written or modified by: |
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* La Monte H.P. Yarroll <[email protected]> |
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* Xingang Guo <[email protected]> |
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* Jon Grimm <[email protected]> |
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* Daisy Chang <[email protected]> |
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* Sridhar Samudrala <[email protected]> |
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* Ardelle Fan <[email protected]> |
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* Ryan Layer <[email protected]> |
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* Kevin Gao <[email protected]> |
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*/ |
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#ifndef __net_sctp_h__ |
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#define __net_sctp_h__ |
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|
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/* Header Strategy. |
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* Start getting some control over the header file depencies: |
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* includes |
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* constants |
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* structs |
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* prototypes |
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* macros, externs, and inlines |
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* |
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* Move test_frame specific items out of the kernel headers |
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* and into the test frame headers. This is not perfect in any sense |
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* and will continue to evolve. |
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*/ |
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|
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#include <linux/types.h> |
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#include <linux/slab.h> |
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#include <linux/in.h> |
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#include <linux/tty.h> |
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#include <linux/proc_fs.h> |
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#include <linux/spinlock.h> |
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#include <linux/jiffies.h> |
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#include <linux/idr.h> |
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|
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#if IS_ENABLED(CONFIG_IPV6) |
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#include <net/ipv6.h> |
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#include <net/ip6_route.h> |
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#endif |
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#include <linux/uaccess.h> |
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#include <asm/page.h> |
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#include <net/sock.h> |
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#include <net/snmp.h> |
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#include <net/sctp/structs.h> |
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#include <net/sctp/constants.h> |
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|
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#ifdef CONFIG_IP_SCTP_MODULE |
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#define SCTP_PROTOSW_FLAG 0 |
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#else /* static! */ |
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#define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT |
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#endif |
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|
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/* Round an int up to the next multiple of 4. */ |
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#define SCTP_PAD4(s) (((s)+3)&~3) |
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/* Truncate to the previous multiple of 4. */ |
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#define SCTP_TRUNC4(s) ((s)&~3) |
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|
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/* |
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* Function declarations. |
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*/ |
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|
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/* |
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* sctp/protocol.c |
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*/ |
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int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *addr, |
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enum sctp_scope, gfp_t gfp, int flags); |
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struct sctp_pf *sctp_get_pf_specific(sa_family_t family); |
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int sctp_register_pf(struct sctp_pf *, sa_family_t); |
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void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); |
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int sctp_udp_sock_start(struct net *net); |
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void sctp_udp_sock_stop(struct net *net); |
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|
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/* |
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* sctp/socket.c |
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*/ |
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int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr, |
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int addr_len, int flags); |
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int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
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int sctp_inet_listen(struct socket *sock, int backlog); |
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void sctp_write_space(struct sock *sk); |
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void sctp_data_ready(struct sock *sk); |
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__poll_t sctp_poll(struct file *file, struct socket *sock, |
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poll_table *wait); |
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void sctp_sock_rfree(struct sk_buff *skb); |
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void sctp_copy_sock(struct sock *newsk, struct sock *sk, |
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struct sctp_association *asoc); |
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extern struct percpu_counter sctp_sockets_allocated; |
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int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); |
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struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); |
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|
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void sctp_transport_walk_start(struct rhashtable_iter *iter); |
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void sctp_transport_walk_stop(struct rhashtable_iter *iter); |
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struct sctp_transport *sctp_transport_get_next(struct net *net, |
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struct rhashtable_iter *iter); |
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struct sctp_transport *sctp_transport_get_idx(struct net *net, |
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struct rhashtable_iter *iter, int pos); |
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int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *), |
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struct net *net, |
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const union sctp_addr *laddr, |
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const union sctp_addr *paddr, void *p); |
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int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *), |
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int (*cb_done)(struct sctp_transport *, void *), |
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struct net *net, int *pos, void *p); |
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int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *), void *p); |
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int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc, |
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struct sctp_info *info); |
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|
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/* |
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* sctp/primitive.c |
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*/ |
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int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); |
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int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); |
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int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); |
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int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); |
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int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); |
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int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); |
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int sctp_primitive_RECONF(struct net *net, struct sctp_association *asoc, |
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void *arg); |
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|
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/* |
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* sctp/input.c |
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*/ |
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int sctp_rcv(struct sk_buff *skb); |
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int sctp_v4_err(struct sk_buff *skb, u32 info); |
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int sctp_hash_endpoint(struct sctp_endpoint *ep); |
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void sctp_unhash_endpoint(struct sctp_endpoint *); |
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struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, |
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struct sctphdr *, struct sctp_association **, |
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struct sctp_transport **); |
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void sctp_err_finish(struct sock *, struct sctp_transport *); |
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void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, |
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struct sctp_transport *t, __u32 pmtu); |
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void sctp_icmp_redirect(struct sock *, struct sctp_transport *, |
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struct sk_buff *); |
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void sctp_icmp_proto_unreachable(struct sock *sk, |
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struct sctp_association *asoc, |
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struct sctp_transport *t); |
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void sctp_backlog_migrate(struct sctp_association *assoc, |
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struct sock *oldsk, struct sock *newsk); |
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int sctp_transport_hashtable_init(void); |
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void sctp_transport_hashtable_destroy(void); |
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int sctp_hash_transport(struct sctp_transport *t); |
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void sctp_unhash_transport(struct sctp_transport *t); |
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struct sctp_transport *sctp_addrs_lookup_transport( |
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struct net *net, |
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const union sctp_addr *laddr, |
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const union sctp_addr *paddr); |
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struct sctp_transport *sctp_epaddr_lookup_transport( |
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const struct sctp_endpoint *ep, |
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const union sctp_addr *paddr); |
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/* |
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* sctp/proc.c |
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*/ |
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int __net_init sctp_proc_init(struct net *net); |
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|
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/* |
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* sctp/offload.c |
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*/ |
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int sctp_offload_init(void); |
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/* |
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* sctp/stream_sched.c |
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*/ |
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void sctp_sched_ops_init(void); |
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/* |
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* sctp/stream.c |
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*/ |
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int sctp_send_reset_streams(struct sctp_association *asoc, |
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struct sctp_reset_streams *params); |
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int sctp_send_reset_assoc(struct sctp_association *asoc); |
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int sctp_send_add_streams(struct sctp_association *asoc, |
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struct sctp_add_streams *params); |
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/* |
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* Module global variables |
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*/ |
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/* |
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* sctp/protocol.c |
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*/ |
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extern struct kmem_cache *sctp_chunk_cachep __read_mostly; |
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extern struct kmem_cache *sctp_bucket_cachep __read_mostly; |
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extern long sysctl_sctp_mem[3]; |
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extern int sysctl_sctp_rmem[3]; |
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extern int sysctl_sctp_wmem[3]; |
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/* |
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* Section: Macros, externs, and inlines |
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*/ |
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/* SCTP SNMP MIB stats handlers */ |
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#define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) |
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#define __SCTP_INC_STATS(net, field) __SNMP_INC_STATS((net)->sctp.sctp_statistics, field) |
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#define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) |
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/* sctp mib definitions */ |
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enum { |
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SCTP_MIB_NUM = 0, |
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SCTP_MIB_CURRESTAB, /* CurrEstab */ |
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SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ |
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SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ |
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SCTP_MIB_ABORTEDS, /* Aborteds */ |
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SCTP_MIB_SHUTDOWNS, /* Shutdowns */ |
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SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ |
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SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ |
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SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ |
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SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ |
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SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ |
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SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ |
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SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ |
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SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ |
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SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ |
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SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ |
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SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ |
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SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ |
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SCTP_MIB_T1_INIT_EXPIREDS, |
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SCTP_MIB_T1_COOKIE_EXPIREDS, |
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SCTP_MIB_T2_SHUTDOWN_EXPIREDS, |
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SCTP_MIB_T3_RTX_EXPIREDS, |
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SCTP_MIB_T4_RTO_EXPIREDS, |
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SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, |
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SCTP_MIB_DELAY_SACK_EXPIREDS, |
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SCTP_MIB_AUTOCLOSE_EXPIREDS, |
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SCTP_MIB_T1_RETRANSMITS, |
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SCTP_MIB_T3_RETRANSMITS, |
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SCTP_MIB_PMTUD_RETRANSMITS, |
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SCTP_MIB_FAST_RETRANSMITS, |
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SCTP_MIB_IN_PKT_SOFTIRQ, |
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SCTP_MIB_IN_PKT_BACKLOG, |
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SCTP_MIB_IN_PKT_DISCARDS, |
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SCTP_MIB_IN_DATA_CHUNK_DISCARDS, |
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__SCTP_MIB_MAX |
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}; |
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#define SCTP_MIB_MAX __SCTP_MIB_MAX |
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struct sctp_mib { |
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unsigned long mibs[SCTP_MIB_MAX]; |
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}; |
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/* helper function to track stats about max rto and related transport */ |
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static inline void sctp_max_rto(struct sctp_association *asoc, |
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struct sctp_transport *trans) |
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{ |
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if (asoc->stats.max_obs_rto < (__u64)trans->rto) { |
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asoc->stats.max_obs_rto = trans->rto; |
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memset(&asoc->stats.obs_rto_ipaddr, 0, |
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sizeof(struct sockaddr_storage)); |
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memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, |
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trans->af_specific->sockaddr_len); |
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} |
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} |
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/* |
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* Macros for keeping a global reference of object allocations. |
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*/ |
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#ifdef CONFIG_SCTP_DBG_OBJCNT |
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extern atomic_t sctp_dbg_objcnt_sock; |
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extern atomic_t sctp_dbg_objcnt_ep; |
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extern atomic_t sctp_dbg_objcnt_assoc; |
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extern atomic_t sctp_dbg_objcnt_transport; |
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extern atomic_t sctp_dbg_objcnt_chunk; |
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extern atomic_t sctp_dbg_objcnt_bind_addr; |
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extern atomic_t sctp_dbg_objcnt_bind_bucket; |
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extern atomic_t sctp_dbg_objcnt_addr; |
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extern atomic_t sctp_dbg_objcnt_datamsg; |
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extern atomic_t sctp_dbg_objcnt_keys; |
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|
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/* Macros to atomically increment/decrement objcnt counters. */ |
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#define SCTP_DBG_OBJCNT_INC(name) \ |
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atomic_inc(&sctp_dbg_objcnt_## name) |
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#define SCTP_DBG_OBJCNT_DEC(name) \ |
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atomic_dec(&sctp_dbg_objcnt_## name) |
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#define SCTP_DBG_OBJCNT(name) \ |
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atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) |
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|
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/* Macro to help create new entries in the global array of |
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* objcnt counters. |
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*/ |
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#define SCTP_DBG_OBJCNT_ENTRY(name) \ |
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{.label= #name, .counter= &sctp_dbg_objcnt_## name} |
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void sctp_dbg_objcnt_init(struct net *); |
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#else |
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#define SCTP_DBG_OBJCNT_INC(name) |
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#define SCTP_DBG_OBJCNT_DEC(name) |
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static inline void sctp_dbg_objcnt_init(struct net *net) { return; } |
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#endif /* CONFIG_SCTP_DBG_OBJCOUNT */ |
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#if defined CONFIG_SYSCTL |
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void sctp_sysctl_register(void); |
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void sctp_sysctl_unregister(void); |
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int sctp_sysctl_net_register(struct net *net); |
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void sctp_sysctl_net_unregister(struct net *net); |
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#else |
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static inline void sctp_sysctl_register(void) { return; } |
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static inline void sctp_sysctl_unregister(void) { return; } |
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static inline int sctp_sysctl_net_register(struct net *net) { return 0; } |
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static inline void sctp_sysctl_net_unregister(struct net *net) { return; } |
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#endif |
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/* Size of Supported Address Parameter for 'x' address types. */ |
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#define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) |
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#if IS_ENABLED(CONFIG_IPV6) |
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void sctp_v6_pf_init(void); |
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void sctp_v6_pf_exit(void); |
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int sctp_v6_protosw_init(void); |
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void sctp_v6_protosw_exit(void); |
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int sctp_v6_add_protocol(void); |
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void sctp_v6_del_protocol(void); |
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#else /* #ifdef defined(CONFIG_IPV6) */ |
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static inline void sctp_v6_pf_init(void) { return; } |
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static inline void sctp_v6_pf_exit(void) { return; } |
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static inline int sctp_v6_protosw_init(void) { return 0; } |
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static inline void sctp_v6_protosw_exit(void) { return; } |
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static inline int sctp_v6_add_protocol(void) { return 0; } |
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static inline void sctp_v6_del_protocol(void) { return; } |
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#endif /* #if defined(CONFIG_IPV6) */ |
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/* Map an association to an assoc_id. */ |
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static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) |
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{ |
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return asoc ? asoc->assoc_id : 0; |
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} |
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static inline enum sctp_sstat_state |
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sctp_assoc_to_state(const struct sctp_association *asoc) |
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{ |
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/* SCTP's uapi always had SCTP_EMPTY(=0) as a dummy state, but we |
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* got rid of it in kernel space. Therefore SCTP_CLOSED et al |
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* start at =1 in user space, but actually as =0 in kernel space. |
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* Now that we can not break user space and SCTP_EMPTY is exposed |
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* there, we need to fix it up with an ugly offset not to break |
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* applications. :( |
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*/ |
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return asoc->state + 1; |
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} |
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/* Look up the association by its id. */ |
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struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); |
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int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); |
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/* A macro to walk a list of skbs. */ |
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#define sctp_skb_for_each(pos, head, tmp) \ |
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skb_queue_walk_safe(head, pos, tmp) |
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/** |
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* sctp_list_dequeue - remove from the head of the queue |
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* @list: list to dequeue from |
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* |
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* Remove the head of the list. The head item is |
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* returned or %NULL if the list is empty. |
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*/ |
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static inline struct list_head *sctp_list_dequeue(struct list_head *list) |
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{ |
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struct list_head *result = NULL; |
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if (!list_empty(list)) { |
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result = list->next; |
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list_del_init(result); |
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} |
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return result; |
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} |
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/* SCTP version of skb_set_owner_r. We need this one because |
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* of the way we have to do receive buffer accounting on bundled |
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* chunks. |
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*/ |
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static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
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{ |
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struct sctp_ulpevent *event = sctp_skb2event(skb); |
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skb_orphan(skb); |
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skb->sk = sk; |
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skb->destructor = sctp_sock_rfree; |
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atomic_add(event->rmem_len, &sk->sk_rmem_alloc); |
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/* |
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* This mimics the behavior of skb_set_owner_r |
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*/ |
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sk_mem_charge(sk, event->rmem_len); |
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} |
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/* Tests if the list has one and only one entry. */ |
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static inline int sctp_list_single_entry(struct list_head *head) |
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{ |
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return list_is_singular(head); |
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} |
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static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk) |
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{ |
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return !list_empty(&chunk->list); |
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} |
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/* Walk through a list of TLV parameters. Don't trust the |
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* individual parameter lengths and instead depend on |
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* the chunk length to indicate when to stop. Make sure |
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* there is room for a param header too. |
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*/ |
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#define sctp_walk_params(pos, chunk, member)\ |
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_sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) |
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#define _sctp_walk_params(pos, chunk, end, member)\ |
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for (pos.v = chunk->member;\ |
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(pos.v + offsetof(struct sctp_paramhdr, length) + sizeof(pos.p->length) <=\ |
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(void *)chunk + end) &&\ |
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pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ |
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ntohs(pos.p->length) >= sizeof(struct sctp_paramhdr);\ |
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pos.v += SCTP_PAD4(ntohs(pos.p->length))) |
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#define sctp_walk_errors(err, chunk_hdr)\ |
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_sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) |
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#define _sctp_walk_errors(err, chunk_hdr, end)\ |
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for (err = (struct sctp_errhdr *)((void *)chunk_hdr + \ |
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sizeof(struct sctp_chunkhdr));\ |
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((void *)err + offsetof(struct sctp_errhdr, length) + sizeof(err->length) <=\ |
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(void *)chunk_hdr + end) &&\ |
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(void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ |
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ntohs(err->length) >= sizeof(struct sctp_errhdr); \ |
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err = (struct sctp_errhdr *)((void *)err + SCTP_PAD4(ntohs(err->length)))) |
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|
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#define sctp_walk_fwdtsn(pos, chunk)\ |
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_sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) |
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|
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#define _sctp_walk_fwdtsn(pos, chunk, end)\ |
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for (pos = chunk->subh.fwdtsn_hdr->skip;\ |
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(void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ |
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pos++) |
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|
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/* External references. */ |
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extern struct proto sctp_prot; |
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extern struct proto sctpv6_prot; |
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void sctp_put_port(struct sock *sk); |
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extern struct idr sctp_assocs_id; |
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extern spinlock_t sctp_assocs_id_lock; |
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/* Static inline functions. */ |
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/* Convert from an IP version number to an Address Family symbol. */ |
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static inline int ipver2af(__u8 ipver) |
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{ |
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switch (ipver) { |
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case 4: |
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return AF_INET; |
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case 6: |
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return AF_INET6; |
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default: |
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return 0; |
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} |
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} |
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/* Convert from an address parameter type to an address family. */ |
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static inline int param_type2af(__be16 type) |
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{ |
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switch (type) { |
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case SCTP_PARAM_IPV4_ADDRESS: |
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return AF_INET; |
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case SCTP_PARAM_IPV6_ADDRESS: |
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return AF_INET6; |
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default: |
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return 0; |
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} |
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} |
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/* Warning: The following hash functions assume a power of two 'size'. */ |
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/* This is the hash function for the SCTP port hash table. */ |
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static inline int sctp_phashfn(struct net *net, __u16 lport) |
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{ |
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return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); |
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} |
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/* This is the hash function for the endpoint hash table. */ |
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static inline int sctp_ep_hashfn(struct net *net, __u16 lport) |
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{ |
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return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); |
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} |
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#define sctp_for_each_hentry(epb, head) \ |
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hlist_for_each_entry(epb, head, node) |
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/* Is a socket of this style? */ |
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#define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) |
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static inline int __sctp_style(const struct sock *sk, |
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enum sctp_socket_type style) |
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{ |
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return sctp_sk(sk)->type == style; |
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} |
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/* Is the association in this state? */ |
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#define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) |
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static inline int __sctp_state(const struct sctp_association *asoc, |
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enum sctp_state state) |
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{ |
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return asoc->state == state; |
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} |
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/* Is the socket in this state? */ |
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#define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) |
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static inline int __sctp_sstate(const struct sock *sk, |
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enum sctp_sock_state state) |
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{ |
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return sk->sk_state == state; |
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} |
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/* Map v4-mapped v6 address back to v4 address */ |
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static inline void sctp_v6_map_v4(union sctp_addr *addr) |
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{ |
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addr->v4.sin_family = AF_INET; |
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addr->v4.sin_port = addr->v6.sin6_port; |
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addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; |
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} |
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/* Map v4 address to v4-mapped v6 address */ |
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static inline void sctp_v4_map_v6(union sctp_addr *addr) |
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{ |
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__be16 port; |
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port = addr->v4.sin_port; |
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addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; |
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addr->v6.sin6_port = port; |
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addr->v6.sin6_family = AF_INET6; |
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addr->v6.sin6_flowinfo = 0; |
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addr->v6.sin6_scope_id = 0; |
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addr->v6.sin6_addr.s6_addr32[0] = 0; |
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addr->v6.sin6_addr.s6_addr32[1] = 0; |
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addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); |
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} |
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/* The cookie is always 0 since this is how it's used in the |
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* pmtu code. |
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*/ |
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static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) |
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{ |
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if (t->dst && !dst_check(t->dst, t->dst_cookie)) |
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sctp_transport_dst_release(t); |
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return t->dst; |
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} |
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/* Calculate max payload size given a MTU, or the total overhead if |
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* given MTU is zero |
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*/ |
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static inline __u32 sctp_mtu_payload(const struct sctp_sock *sp, |
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__u32 mtu, __u32 extra) |
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{ |
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__u32 overhead = sizeof(struct sctphdr) + extra; |
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if (sp) { |
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overhead += sp->pf->af->net_header_len; |
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if (sp->udp_port) |
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overhead += sizeof(struct udphdr); |
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} else { |
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overhead += sizeof(struct ipv6hdr); |
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} |
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if (WARN_ON_ONCE(mtu && mtu <= overhead)) |
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mtu = overhead; |
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return mtu ? mtu - overhead : overhead; |
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} |
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static inline __u32 sctp_dst_mtu(const struct dst_entry *dst) |
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{ |
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return SCTP_TRUNC4(max_t(__u32, dst_mtu(dst), |
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SCTP_DEFAULT_MINSEGMENT)); |
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} |
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static inline bool sctp_transport_pmtu_check(struct sctp_transport *t) |
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{ |
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__u32 pmtu = sctp_dst_mtu(t->dst); |
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if (t->pathmtu == pmtu) |
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return true; |
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t->pathmtu = pmtu; |
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return false; |
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} |
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static inline __u32 sctp_min_frag_point(struct sctp_sock *sp, __u16 datasize) |
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{ |
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return sctp_mtu_payload(sp, SCTP_DEFAULT_MINSEGMENT, datasize); |
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} |
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static inline bool sctp_newsk_ready(const struct sock *sk) |
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{ |
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return sock_flag(sk, SOCK_DEAD) || sk->sk_socket; |
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} |
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static inline void sctp_sock_set_nodelay(struct sock *sk) |
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{ |
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lock_sock(sk); |
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sctp_sk(sk)->nodelay = true; |
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release_sock(sk); |
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} |
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#endif /* __net_sctp_h__ */
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