![Al Viro](/assets/img/avatar_default.png)
- added typedef unsigned int __nocast gfp_t; - replaced __nocast uses for gfp flags with gfp_t - it gives exactly the same warnings as far as sparse is concerned, doesn't change generated code (from gcc point of view we replaced unsigned int with typedef) and documents what's going on far better. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
422 lines
11 KiB
C
422 lines
11 KiB
C
/* SCTP kernel reference Implementation
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* (C) Copyright IBM Corp. 2001, 2003
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* Copyright (c) Cisco 1999,2000
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* Copyright (c) Motorola 1999,2000,2001
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* Copyright (c) La Monte H.P. Yarroll 2001
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*
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* This file is part of the SCTP kernel reference implementation.
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*
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* A collection class to handle the storage of transport addresses.
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*
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* The SCTP reference 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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* The SCTP reference 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, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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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 <lksctp-developers@lists.sourceforge.net>
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*
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* Or submit a bug report through the following website:
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* http://www.sf.net/projects/lksctp
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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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* Karl Knutson <karl@athena.chicago.il.us>
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* Jon Grimm <jgrimm@us.ibm.com>
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* Daisy Chang <daisyc@us.ibm.com>
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*
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* Any bugs reported given to us we will try to fix... any fixes shared will
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* be incorporated into the next SCTP release.
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*/
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/in.h>
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#include <net/sock.h>
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#include <net/ipv6.h>
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#include <net/if_inet6.h>
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#include <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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/* Forward declarations for internal helpers. */
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static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *,
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sctp_scope_t scope, gfp_t gfp,
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int flags);
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static void sctp_bind_addr_clean(struct sctp_bind_addr *);
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/* First Level Abstractions. */
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/* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses
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* in 'src' which have a broader scope than 'scope'.
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*/
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int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
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const struct sctp_bind_addr *src,
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sctp_scope_t scope, gfp_t gfp,
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int flags)
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{
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struct sctp_sockaddr_entry *addr;
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struct list_head *pos;
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int error = 0;
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/* All addresses share the same port. */
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dest->port = src->port;
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/* Extract the addresses which are relevant for this scope. */
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list_for_each(pos, &src->address_list) {
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addr = list_entry(pos, struct sctp_sockaddr_entry, list);
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error = sctp_copy_one_addr(dest, &addr->a, scope,
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gfp, flags);
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if (error < 0)
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goto out;
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}
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/* If there are no addresses matching the scope and
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* this is global scope, try to get a link scope address, with
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* the assumption that we must be sitting behind a NAT.
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*/
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if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) {
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list_for_each(pos, &src->address_list) {
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addr = list_entry(pos, struct sctp_sockaddr_entry,
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list);
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error = sctp_copy_one_addr(dest, &addr->a,
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SCTP_SCOPE_LINK, gfp,
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flags);
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if (error < 0)
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goto out;
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}
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}
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out:
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if (error)
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sctp_bind_addr_clean(dest);
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return error;
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}
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/* Initialize the SCTP_bind_addr structure for either an endpoint or
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* an association.
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*/
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void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
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{
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bp->malloced = 0;
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INIT_LIST_HEAD(&bp->address_list);
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bp->port = port;
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}
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/* Dispose of the address list. */
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static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
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{
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struct sctp_sockaddr_entry *addr;
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struct list_head *pos, *temp;
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/* Empty the bind address list. */
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list_for_each_safe(pos, temp, &bp->address_list) {
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addr = list_entry(pos, struct sctp_sockaddr_entry, list);
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list_del(pos);
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kfree(addr);
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SCTP_DBG_OBJCNT_DEC(addr);
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}
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}
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/* Dispose of an SCTP_bind_addr structure */
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void sctp_bind_addr_free(struct sctp_bind_addr *bp)
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{
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/* Empty the bind address list. */
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sctp_bind_addr_clean(bp);
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if (bp->malloced) {
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kfree(bp);
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SCTP_DBG_OBJCNT_DEC(bind_addr);
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}
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}
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/* Add an address to the bind address list in the SCTP_bind_addr structure. */
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int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
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gfp_t gfp)
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{
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struct sctp_sockaddr_entry *addr;
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/* Add the address to the bind address list. */
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addr = t_new(struct sctp_sockaddr_entry, gfp);
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if (!addr)
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return -ENOMEM;
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memcpy(&addr->a, new, sizeof(*new));
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/* Fix up the port if it has not yet been set.
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* Both v4 and v6 have the port at the same offset.
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*/
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if (!addr->a.v4.sin_port)
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addr->a.v4.sin_port = bp->port;
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INIT_LIST_HEAD(&addr->list);
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list_add_tail(&addr->list, &bp->address_list);
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SCTP_DBG_OBJCNT_INC(addr);
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return 0;
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}
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/* Delete an address from the bind address list in the SCTP_bind_addr
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* structure.
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*/
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int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
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{
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struct list_head *pos, *temp;
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struct sctp_sockaddr_entry *addr;
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list_for_each_safe(pos, temp, &bp->address_list) {
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addr = list_entry(pos, struct sctp_sockaddr_entry, list);
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if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
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/* Found the exact match. */
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list_del(pos);
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kfree(addr);
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SCTP_DBG_OBJCNT_DEC(addr);
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return 0;
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}
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}
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return -EINVAL;
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}
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/* Create a network byte-order representation of all the addresses
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* formated as SCTP parameters.
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*
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* The second argument is the return value for the length.
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*/
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union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
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int *addrs_len,
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gfp_t gfp)
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{
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union sctp_params addrparms;
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union sctp_params retval;
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int addrparms_len;
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union sctp_addr_param rawaddr;
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int len;
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struct sctp_sockaddr_entry *addr;
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struct list_head *pos;
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struct sctp_af *af;
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addrparms_len = 0;
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len = 0;
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/* Allocate enough memory at once. */
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list_for_each(pos, &bp->address_list) {
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len += sizeof(union sctp_addr_param);
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}
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/* Don't even bother embedding an address if there
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* is only one.
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*/
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if (len == sizeof(union sctp_addr_param)) {
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retval.v = NULL;
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goto end_raw;
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}
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retval.v = kmalloc(len, gfp);
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if (!retval.v)
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goto end_raw;
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addrparms = retval;
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list_for_each(pos, &bp->address_list) {
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addr = list_entry(pos, struct sctp_sockaddr_entry, list);
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af = sctp_get_af_specific(addr->a.v4.sin_family);
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len = af->to_addr_param(&addr->a, &rawaddr);
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memcpy(addrparms.v, &rawaddr, len);
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addrparms.v += len;
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addrparms_len += len;
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}
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end_raw:
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*addrs_len = addrparms_len;
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return retval;
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}
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/*
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* Create an address list out of the raw address list format (IPv4 and IPv6
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* address parameters).
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*/
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int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
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int addrs_len, __u16 port, gfp_t gfp)
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{
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union sctp_addr_param *rawaddr;
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struct sctp_paramhdr *param;
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union sctp_addr addr;
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int retval = 0;
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int len;
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struct sctp_af *af;
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/* Convert the raw address to standard address format */
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while (addrs_len) {
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param = (struct sctp_paramhdr *)raw_addr_list;
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rawaddr = (union sctp_addr_param *)raw_addr_list;
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af = sctp_get_af_specific(param_type2af(param->type));
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if (unlikely(!af)) {
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retval = -EINVAL;
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sctp_bind_addr_clean(bp);
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break;
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}
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af->from_addr_param(&addr, rawaddr, port, 0);
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retval = sctp_add_bind_addr(bp, &addr, gfp);
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if (retval) {
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/* Can't finish building the list, clean up. */
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sctp_bind_addr_clean(bp);
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break;
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}
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len = ntohs(param->length);
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addrs_len -= len;
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raw_addr_list += len;
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}
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return retval;
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}
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/********************************************************************
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* 2nd Level Abstractions
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********************************************************************/
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/* Does this contain a specified address? Allow wildcarding. */
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int sctp_bind_addr_match(struct sctp_bind_addr *bp,
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const union sctp_addr *addr,
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struct sctp_sock *opt)
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{
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struct sctp_sockaddr_entry *laddr;
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struct list_head *pos;
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list_for_each(pos, &bp->address_list) {
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laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
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if (opt->pf->cmp_addr(&laddr->a, addr, opt))
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return 1;
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}
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return 0;
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}
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/* Find the first address in the bind address list that is not present in
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* the addrs packed array.
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*/
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union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
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const union sctp_addr *addrs,
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int addrcnt,
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struct sctp_sock *opt)
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{
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struct sctp_sockaddr_entry *laddr;
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union sctp_addr *addr;
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void *addr_buf;
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struct sctp_af *af;
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struct list_head *pos;
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int i;
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list_for_each(pos, &bp->address_list) {
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laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
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addr_buf = (union sctp_addr *)addrs;
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for (i = 0; i < addrcnt; i++) {
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addr = (union sctp_addr *)addr_buf;
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af = sctp_get_af_specific(addr->v4.sin_family);
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if (!af)
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return NULL;
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if (opt->pf->cmp_addr(&laddr->a, addr, opt))
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break;
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addr_buf += af->sockaddr_len;
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}
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if (i == addrcnt)
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return &laddr->a;
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}
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return NULL;
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}
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/* Copy out addresses from the global local address list. */
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static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
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union sctp_addr *addr,
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sctp_scope_t scope, gfp_t gfp,
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int flags)
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{
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int error = 0;
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if (sctp_is_any(addr)) {
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error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
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} else if (sctp_in_scope(addr, scope)) {
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/* Now that the address is in scope, check to see if
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* the address type is supported by local sock as
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* well as the remote peer.
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*/
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if ((((AF_INET == addr->sa.sa_family) &&
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(flags & SCTP_ADDR4_PEERSUPP))) ||
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(((AF_INET6 == addr->sa.sa_family) &&
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(flags & SCTP_ADDR6_ALLOWED) &&
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(flags & SCTP_ADDR6_PEERSUPP))))
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error = sctp_add_bind_addr(dest, addr, gfp);
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}
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return error;
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}
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/* Is this a wildcard address? */
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int sctp_is_any(const union sctp_addr *addr)
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{
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struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
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if (!af)
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return 0;
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return af->is_any(addr);
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}
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/* Is 'addr' valid for 'scope'? */
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int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
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{
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sctp_scope_t addr_scope = sctp_scope(addr);
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/* The unusable SCTP addresses will not be considered with
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* any defined scopes.
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*/
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if (SCTP_SCOPE_UNUSABLE == addr_scope)
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return 0;
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/*
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* For INIT and INIT-ACK address list, let L be the level of
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* of requested destination address, sender and receiver
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* SHOULD include all of its addresses with level greater
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* than or equal to L.
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*/
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if (addr_scope <= scope)
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return 1;
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return 0;
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}
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/********************************************************************
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* 3rd Level Abstractions
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********************************************************************/
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/* What is the scope of 'addr'? */
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sctp_scope_t sctp_scope(const union sctp_addr *addr)
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{
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struct sctp_af *af;
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af = sctp_get_af_specific(addr->sa.sa_family);
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if (!af)
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return SCTP_SCOPE_UNUSABLE;
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return af->scope((union sctp_addr *)addr);
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}
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