![Marcelo Ricardo Leitner](/assets/img/avatar_default.png)
SCTP has this pecualiarity that its packets cannot be just segmented to
(P)MTU. Its chunks must be contained in IP segments, padding respected.
So we can't just generate a big skb, set gso_size to the fragmentation
point and deliver it to IP layer.
This patch takes a different approach. SCTP will now build a skb as it
would be if it was received using GRO. That is, there will be a cover
skb with protocol headers and children ones containing the actual
segments, already segmented to a way that respects SCTP RFCs.
With that, we can tell skb_segment() to just split based on frag_list,
trusting its sizes are already in accordance.
This way SCTP can benefit from GSO and instead of passing several
packets through the stack, it can pass a single large packet.
v2:
- Added support for receiving GSO frames, as requested by Dave Miller.
- Clear skb->cb if packet is GSO (otherwise it's not used by SCTP)
- Added heuristics similar to what we have in TCP for not generating
single GSO packets that fills cwnd.
v3:
- consider sctphdr size in skb_gso_transport_seglen()
- rebased due to 5c7cdf339a
("gso: Remove arbitrary checks for
unsupported GSO")
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Tested-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
598 lines
18 KiB
C
598 lines
18 KiB
C
/* 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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* This SCTP implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This SCTP implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, see
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* <http://www.gnu.org/licenses/>.
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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 <linux-sctp@vger.kernel.org>
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*
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* Written or modified by:
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* La Monte H.P. Yarroll <piggy@acm.org>
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* Xingang Guo <xingang.guo@intel.com>
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* Jon Grimm <jgrimm@us.ibm.com>
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* Daisy Chang <daisyc@us.ibm.com>
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* Sridhar Samudrala <sri@us.ibm.com>
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* Ardelle Fan <ardelle.fan@intel.com>
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* Ryan Layer <rmlayer@us.ibm.com>
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* Kevin Gao <kevin.gao@intel.com>
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*/
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#ifndef __net_sctp_h__
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#define __net_sctp_h__
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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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#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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#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 <asm/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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#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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/* Round an int up to the next multiple of 4. */
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#define WORD_ROUND(s) (((s)+3)&~3)
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/* Truncate to the previous multiple of 4. */
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#define WORD_TRUNC(s) ((s)&~3)
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/*
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* Function declarations.
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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 *, struct sctp_bind_addr *,
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sctp_scope_t, 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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/*
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* sctp/socket.c
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*/
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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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unsigned int 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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int 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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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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* 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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/*
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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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void sctp_v4_err(struct sk_buff *skb, u32 info);
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void sctp_hash_endpoint(struct sctp_endpoint *);
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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_association *);
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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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void 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 sctp_snmp_proc_init(struct net *net);
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void sctp_snmp_proc_exit(struct net *net);
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int sctp_eps_proc_init(struct net *net);
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void sctp_eps_proc_exit(struct net *net);
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int sctp_assocs_proc_init(struct net *net);
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void sctp_assocs_proc_exit(struct net *net);
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int sctp_remaddr_proc_init(struct net *net);
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void sctp_remaddr_proc_exit(struct net *net);
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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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* 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_ssnmap;
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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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/* 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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/* Macro to help create new entries in 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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void sctp_dbg_objcnt_exit(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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static inline void sctp_dbg_objcnt_exit(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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}
|
|
|
|
/* SCTP version of skb_set_owner_r. We need this one because
|
|
* of the way we have to do receive buffer accounting on bundled
|
|
* chunks.
|
|
*/
|
|
static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
|
|
{
|
|
struct sctp_ulpevent *event = sctp_skb2event(skb);
|
|
|
|
skb_orphan(skb);
|
|
skb->sk = sk;
|
|
skb->destructor = sctp_sock_rfree;
|
|
atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
|
|
/*
|
|
* This mimics the behavior of skb_set_owner_r
|
|
*/
|
|
sk->sk_forward_alloc -= event->rmem_len;
|
|
}
|
|
|
|
/* Tests if the list has one and only one entry. */
|
|
static inline int sctp_list_single_entry(struct list_head *head)
|
|
{
|
|
return (head->next != head) && (head->next == head->prev);
|
|
}
|
|
|
|
/* Break down data chunks at this point. */
|
|
static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
|
|
{
|
|
struct sctp_sock *sp = sctp_sk(asoc->base.sk);
|
|
int frag = pmtu;
|
|
|
|
frag -= sp->pf->af->net_header_len;
|
|
frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
|
|
|
|
if (asoc->user_frag)
|
|
frag = min_t(int, frag, asoc->user_frag);
|
|
|
|
frag = WORD_TRUNC(min_t(int, frag, SCTP_MAX_CHUNK_LEN));
|
|
|
|
return frag;
|
|
}
|
|
|
|
static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc)
|
|
{
|
|
|
|
sctp_assoc_sync_pmtu(sk, asoc);
|
|
asoc->pmtu_pending = 0;
|
|
}
|
|
|
|
static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk)
|
|
{
|
|
return !list_empty(&chunk->list);
|
|
}
|
|
|
|
/* Walk through a list of TLV parameters. Don't trust the
|
|
* individual parameter lengths and instead depend on
|
|
* the chunk length to indicate when to stop. Make sure
|
|
* there is room for a param header too.
|
|
*/
|
|
#define sctp_walk_params(pos, chunk, member)\
|
|
_sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
|
|
|
|
#define _sctp_walk_params(pos, chunk, end, member)\
|
|
for (pos.v = chunk->member;\
|
|
pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
|
|
ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
|
|
pos.v += WORD_ROUND(ntohs(pos.p->length)))
|
|
|
|
#define sctp_walk_errors(err, chunk_hdr)\
|
|
_sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
|
|
|
|
#define _sctp_walk_errors(err, chunk_hdr, end)\
|
|
for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
|
|
sizeof(sctp_chunkhdr_t));\
|
|
(void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
|
|
ntohs(err->length) >= sizeof(sctp_errhdr_t); \
|
|
err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
|
|
|
|
#define sctp_walk_fwdtsn(pos, chunk)\
|
|
_sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
|
|
|
|
#define _sctp_walk_fwdtsn(pos, chunk, end)\
|
|
for (pos = chunk->subh.fwdtsn_hdr->skip;\
|
|
(void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
|
|
pos++)
|
|
|
|
/* External references. */
|
|
|
|
extern struct proto sctp_prot;
|
|
extern struct proto sctpv6_prot;
|
|
void sctp_put_port(struct sock *sk);
|
|
|
|
extern struct idr sctp_assocs_id;
|
|
extern spinlock_t sctp_assocs_id_lock;
|
|
|
|
/* Static inline functions. */
|
|
|
|
/* Convert from an IP version number to an Address Family symbol. */
|
|
static inline int ipver2af(__u8 ipver)
|
|
{
|
|
switch (ipver) {
|
|
case 4:
|
|
return AF_INET;
|
|
case 6:
|
|
return AF_INET6;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Convert from an address parameter type to an address family. */
|
|
static inline int param_type2af(__be16 type)
|
|
{
|
|
switch (type) {
|
|
case SCTP_PARAM_IPV4_ADDRESS:
|
|
return AF_INET;
|
|
case SCTP_PARAM_IPV6_ADDRESS:
|
|
return AF_INET6;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Warning: The following hash functions assume a power of two 'size'. */
|
|
/* This is the hash function for the SCTP port hash table. */
|
|
static inline int sctp_phashfn(struct net *net, __u16 lport)
|
|
{
|
|
return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1);
|
|
}
|
|
|
|
/* This is the hash function for the endpoint hash table. */
|
|
static inline int sctp_ep_hashfn(struct net *net, __u16 lport)
|
|
{
|
|
return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1);
|
|
}
|
|
|
|
#define sctp_for_each_hentry(epb, head) \
|
|
hlist_for_each_entry(epb, head, node)
|
|
|
|
/* Is a socket of this style? */
|
|
#define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
|
|
static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
|
|
{
|
|
return sctp_sk(sk)->type == style;
|
|
}
|
|
|
|
/* Is the association in this state? */
|
|
#define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
|
|
static inline int __sctp_state(const struct sctp_association *asoc,
|
|
sctp_state_t state)
|
|
{
|
|
return asoc->state == state;
|
|
}
|
|
|
|
/* Is the socket in this state? */
|
|
#define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
|
|
static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
|
|
{
|
|
return sk->sk_state == state;
|
|
}
|
|
|
|
/* Map v4-mapped v6 address back to v4 address */
|
|
static inline void sctp_v6_map_v4(union sctp_addr *addr)
|
|
{
|
|
addr->v4.sin_family = AF_INET;
|
|
addr->v4.sin_port = addr->v6.sin6_port;
|
|
addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
|
|
}
|
|
|
|
/* Map v4 address to v4-mapped v6 address */
|
|
static inline void sctp_v4_map_v6(union sctp_addr *addr)
|
|
{
|
|
__be16 port;
|
|
|
|
port = addr->v4.sin_port;
|
|
addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
|
|
addr->v6.sin6_port = port;
|
|
addr->v6.sin6_family = AF_INET6;
|
|
addr->v6.sin6_flowinfo = 0;
|
|
addr->v6.sin6_scope_id = 0;
|
|
addr->v6.sin6_addr.s6_addr32[0] = 0;
|
|
addr->v6.sin6_addr.s6_addr32[1] = 0;
|
|
addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
|
|
}
|
|
|
|
/* The cookie is always 0 since this is how it's used in the
|
|
* pmtu code.
|
|
*/
|
|
static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
|
|
{
|
|
if (t->dst && !dst_check(t->dst, t->dst_cookie)) {
|
|
dst_release(t->dst);
|
|
t->dst = NULL;
|
|
}
|
|
|
|
return t->dst;
|
|
}
|
|
|
|
#endif /* __net_sctp_h__ */
|