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566 lines
14 KiB
566 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* SCTP kernel implementation |
|
* (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 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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* 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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* Karl Knutson <[email protected]> |
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* Jon Grimm <[email protected]> |
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* Daisy Chang <[email protected]> |
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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 <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 net *net, struct sctp_bind_addr *dest, |
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union sctp_addr *addr, enum sctp_scope scope, |
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gfp_t gfp, int flags); |
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static void sctp_bind_addr_clean(struct sctp_bind_addr *); |
|
|
|
/* 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 net *net, struct sctp_bind_addr *dest, |
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const struct sctp_bind_addr *src, |
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enum sctp_scope scope, gfp_t gfp, |
|
int flags) |
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{ |
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struct sctp_sockaddr_entry *addr; |
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int error = 0; |
|
|
|
/* 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_entry(addr, &src->address_list, list) { |
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error = sctp_copy_one_addr(net, dest, &addr->a, scope, |
|
gfp, flags); |
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if (error < 0) |
|
goto out; |
|
} |
|
|
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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 |
|
* 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_entry(addr, &src->address_list, list) { |
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error = sctp_copy_one_addr(net, dest, &addr->a, |
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SCTP_SCOPE_LINK, gfp, |
|
flags); |
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if (error < 0) |
|
goto out; |
|
} |
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} |
|
|
|
out: |
|
if (error) |
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sctp_bind_addr_clean(dest); |
|
|
|
return error; |
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} |
|
|
|
/* Exactly duplicate the address lists. This is necessary when doing |
|
* peer-offs and accepts. We don't want to put all the current system |
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* addresses into the endpoint. That's useless. But we do want duplicat |
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* the list of bound addresses that the older endpoint used. |
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*/ |
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int sctp_bind_addr_dup(struct sctp_bind_addr *dest, |
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const struct sctp_bind_addr *src, |
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gfp_t gfp) |
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{ |
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struct sctp_sockaddr_entry *addr; |
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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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|
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list_for_each_entry(addr, &src->address_list, list) { |
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error = sctp_add_bind_addr(dest, &addr->a, sizeof(addr->a), |
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1, gfp); |
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if (error < 0) |
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break; |
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} |
|
|
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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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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, *temp; |
|
|
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/* Empty the bind address list. */ |
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list_for_each_entry_safe(addr, temp, &bp->address_list, list) { |
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list_del_rcu(&addr->list); |
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kfree_rcu(addr, rcu); |
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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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} |
|
|
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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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int new_size, __u8 addr_state, 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 = kzalloc(sizeof(*addr), gfp); |
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if (!addr) |
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return -ENOMEM; |
|
|
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memcpy(&addr->a, new, min_t(size_t, sizeof(*new), new_size)); |
|
|
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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 = htons(bp->port); |
|
|
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addr->state = addr_state; |
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addr->valid = 1; |
|
|
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INIT_LIST_HEAD(&addr->list); |
|
|
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/* We always hold a socket lock when calling this function, |
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* and that acts as a writer synchronizing lock. |
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*/ |
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list_add_tail_rcu(&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 sctp_sockaddr_entry *addr, *temp; |
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int found = 0; |
|
|
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/* We hold the socket lock when calling this function, |
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* and that acts as a writer synchronizing lock. |
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*/ |
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list_for_each_entry_safe(addr, temp, &bp->address_list, 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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found = 1; |
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addr->valid = 0; |
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list_del_rcu(&addr->list); |
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break; |
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} |
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} |
|
|
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if (found) { |
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kfree_rcu(addr, rcu); |
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SCTP_DBG_OBJCNT_DEC(addr); |
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return 0; |
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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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|
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addrparms_len = 0; |
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len = 0; |
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|
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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_entry(addr, &bp->address_list, 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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|
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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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/* |
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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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|
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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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|
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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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|
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af->from_addr_param(&addr, rawaddr, htons(port), 0); |
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if (sctp_bind_addr_state(bp, &addr) != -1) |
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goto next; |
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retval = sctp_add_bind_addr(bp, &addr, sizeof(addr), |
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SCTP_ADDR_SRC, 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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next: |
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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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|
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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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int match = 0; |
|
|
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rcu_read_lock(); |
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list_for_each_entry_rcu(laddr, &bp->address_list, list) { |
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if (!laddr->valid) |
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continue; |
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if (opt->pf->cmp_addr(&laddr->a, addr, opt)) { |
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match = 1; |
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break; |
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} |
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} |
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rcu_read_unlock(); |
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|
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return match; |
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} |
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|
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int sctp_bind_addrs_check(struct sctp_sock *sp, |
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struct sctp_sock *sp2, int cnt2) |
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{ |
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struct sctp_bind_addr *bp2 = &sp2->ep->base.bind_addr; |
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struct sctp_bind_addr *bp = &sp->ep->base.bind_addr; |
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struct sctp_sockaddr_entry *laddr, *laddr2; |
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bool exist = false; |
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int cnt = 0; |
|
|
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rcu_read_lock(); |
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list_for_each_entry_rcu(laddr, &bp->address_list, list) { |
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list_for_each_entry_rcu(laddr2, &bp2->address_list, list) { |
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if (sp->pf->af->cmp_addr(&laddr->a, &laddr2->a) && |
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laddr->valid && laddr2->valid) { |
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exist = true; |
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goto next; |
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} |
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} |
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cnt = 0; |
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break; |
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next: |
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cnt++; |
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} |
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rcu_read_unlock(); |
|
|
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return (cnt == cnt2) ? 0 : (exist ? -EEXIST : 1); |
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} |
|
|
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/* Does the address 'addr' conflict with any addresses in |
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* the bp. |
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*/ |
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int sctp_bind_addr_conflict(struct sctp_bind_addr *bp, |
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const union sctp_addr *addr, |
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struct sctp_sock *bp_sp, |
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struct sctp_sock *addr_sp) |
|
{ |
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struct sctp_sockaddr_entry *laddr; |
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int conflict = 0; |
|
struct sctp_sock *sp; |
|
|
|
/* Pick the IPv6 socket as the basis of comparison |
|
* since it's usually a superset of the IPv4. |
|
* If there is no IPv6 socket, then default to bind_addr. |
|
*/ |
|
if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6) |
|
sp = bp_sp; |
|
else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6) |
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sp = addr_sp; |
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else |
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sp = bp_sp; |
|
|
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rcu_read_lock(); |
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list_for_each_entry_rcu(laddr, &bp->address_list, list) { |
|
if (!laddr->valid) |
|
continue; |
|
|
|
conflict = sp->pf->cmp_addr(&laddr->a, addr, sp); |
|
if (conflict) |
|
break; |
|
} |
|
rcu_read_unlock(); |
|
|
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return conflict; |
|
} |
|
|
|
/* Get the state of the entry in the bind_addr_list */ |
|
int sctp_bind_addr_state(const struct sctp_bind_addr *bp, |
|
const union sctp_addr *addr) |
|
{ |
|
struct sctp_sockaddr_entry *laddr; |
|
struct sctp_af *af; |
|
|
|
af = sctp_get_af_specific(addr->sa.sa_family); |
|
if (unlikely(!af)) |
|
return -1; |
|
|
|
list_for_each_entry_rcu(laddr, &bp->address_list, list) { |
|
if (!laddr->valid) |
|
continue; |
|
if (af->cmp_addr(&laddr->a, addr)) |
|
return laddr->state; |
|
} |
|
|
|
return -1; |
|
} |
|
|
|
/* Find the first address in the bind address list that is not present in |
|
* the addrs packed array. |
|
*/ |
|
union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, |
|
const union sctp_addr *addrs, |
|
int addrcnt, |
|
struct sctp_sock *opt) |
|
{ |
|
struct sctp_sockaddr_entry *laddr; |
|
union sctp_addr *addr; |
|
void *addr_buf; |
|
struct sctp_af *af; |
|
int i; |
|
|
|
/* This is only called sctp_send_asconf_del_ip() and we hold |
|
* the socket lock in that code patch, so that address list |
|
* can't change. |
|
*/ |
|
list_for_each_entry(laddr, &bp->address_list, list) { |
|
addr_buf = (union sctp_addr *)addrs; |
|
for (i = 0; i < addrcnt; i++) { |
|
addr = addr_buf; |
|
af = sctp_get_af_specific(addr->v4.sin_family); |
|
if (!af) |
|
break; |
|
|
|
if (opt->pf->cmp_addr(&laddr->a, addr, opt)) |
|
break; |
|
|
|
addr_buf += af->sockaddr_len; |
|
} |
|
if (i == addrcnt) |
|
return &laddr->a; |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
/* Copy out addresses from the global local address list. */ |
|
static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest, |
|
union sctp_addr *addr, enum sctp_scope scope, |
|
gfp_t gfp, int flags) |
|
{ |
|
int error = 0; |
|
|
|
if (sctp_is_any(NULL, addr)) { |
|
error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags); |
|
} else if (sctp_in_scope(net, addr, scope)) { |
|
/* Now that the address is in scope, check to see if |
|
* the address type is supported by local sock as |
|
* well as the remote peer. |
|
*/ |
|
if ((((AF_INET == addr->sa.sa_family) && |
|
(flags & SCTP_ADDR4_ALLOWED) && |
|
(flags & SCTP_ADDR4_PEERSUPP))) || |
|
(((AF_INET6 == addr->sa.sa_family) && |
|
(flags & SCTP_ADDR6_ALLOWED) && |
|
(flags & SCTP_ADDR6_PEERSUPP)))) |
|
error = sctp_add_bind_addr(dest, addr, sizeof(*addr), |
|
SCTP_ADDR_SRC, gfp); |
|
} |
|
|
|
return error; |
|
} |
|
|
|
/* Is this a wildcard address? */ |
|
int sctp_is_any(struct sock *sk, const union sctp_addr *addr) |
|
{ |
|
unsigned short fam = 0; |
|
struct sctp_af *af; |
|
|
|
/* Try to get the right address family */ |
|
if (addr->sa.sa_family != AF_UNSPEC) |
|
fam = addr->sa.sa_family; |
|
else if (sk) |
|
fam = sk->sk_family; |
|
|
|
af = sctp_get_af_specific(fam); |
|
if (!af) |
|
return 0; |
|
|
|
return af->is_any(addr); |
|
} |
|
|
|
/* Is 'addr' valid for 'scope'? */ |
|
int sctp_in_scope(struct net *net, const union sctp_addr *addr, |
|
enum sctp_scope scope) |
|
{ |
|
enum sctp_scope addr_scope = sctp_scope(addr); |
|
|
|
/* The unusable SCTP addresses will not be considered with |
|
* any defined scopes. |
|
*/ |
|
if (SCTP_SCOPE_UNUSABLE == addr_scope) |
|
return 0; |
|
/* |
|
* For INIT and INIT-ACK address list, let L be the level of |
|
* requested destination address, sender and receiver |
|
* SHOULD include all of its addresses with level greater |
|
* than or equal to L. |
|
* |
|
* Address scoping can be selectively controlled via sysctl |
|
* option |
|
*/ |
|
switch (net->sctp.scope_policy) { |
|
case SCTP_SCOPE_POLICY_DISABLE: |
|
return 1; |
|
case SCTP_SCOPE_POLICY_ENABLE: |
|
if (addr_scope <= scope) |
|
return 1; |
|
break; |
|
case SCTP_SCOPE_POLICY_PRIVATE: |
|
if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope) |
|
return 1; |
|
break; |
|
case SCTP_SCOPE_POLICY_LINK: |
|
if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope) |
|
return 1; |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
int sctp_is_ep_boundall(struct sock *sk) |
|
{ |
|
struct sctp_bind_addr *bp; |
|
struct sctp_sockaddr_entry *addr; |
|
|
|
bp = &sctp_sk(sk)->ep->base.bind_addr; |
|
if (sctp_list_single_entry(&bp->address_list)) { |
|
addr = list_entry(bp->address_list.next, |
|
struct sctp_sockaddr_entry, list); |
|
if (sctp_is_any(sk, &addr->a)) |
|
return 1; |
|
} |
|
return 0; |
|
} |
|
|
|
/******************************************************************** |
|
* 3rd Level Abstractions |
|
********************************************************************/ |
|
|
|
/* What is the scope of 'addr'? */ |
|
enum sctp_scope sctp_scope(const union sctp_addr *addr) |
|
{ |
|
struct sctp_af *af; |
|
|
|
af = sctp_get_af_specific(addr->sa.sa_family); |
|
if (!af) |
|
return SCTP_SCOPE_UNUSABLE; |
|
|
|
return af->scope((union sctp_addr *)addr); |
|
}
|
|
|