| /* SCTP kernel reference Implementation |
| * (C) Copyright IBM Corp. 2001, 2003 |
| * Copyright (c) Cisco 1999,2000 |
| * Copyright (c) Motorola 1999,2000,2001 |
| * Copyright (c) La Monte H.P. Yarroll 2001 |
| * |
| * This file is part of the SCTP kernel reference implementation. |
| * |
| * A collection class to handle the storage of transport addresses. |
| * |
| * The SCTP reference implementation is free software; |
| * you can redistribute it and/or modify it under the terms of |
| * the GNU General Public License as published by |
| * the Free Software Foundation; either version 2, or (at your option) |
| * any later version. |
| * |
| * The SCTP reference implementation is distributed in the hope that it |
| * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| * ************************ |
| * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| * See the GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with GNU CC; see the file COPYING. If not, write to |
| * the Free Software Foundation, 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| * |
| * Please send any bug reports or fixes you make to the |
| * email address(es): |
| * lksctp developers <lksctp-developers@lists.sourceforge.net> |
| * |
| * Or submit a bug report through the following website: |
| * http://www.sf.net/projects/lksctp |
| * |
| * Written or modified by: |
| * La Monte H.P. Yarroll <piggy@acm.org> |
| * Karl Knutson <karl@athena.chicago.il.us> |
| * Jon Grimm <jgrimm@us.ibm.com> |
| * Daisy Chang <daisyc@us.ibm.com> |
| * |
| * Any bugs reported given to us we will try to fix... any fixes shared will |
| * be incorporated into the next SCTP release. |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/sched.h> |
| #include <linux/in.h> |
| #include <net/sock.h> |
| #include <net/ipv6.h> |
| #include <net/if_inet6.h> |
| #include <net/sctp/sctp.h> |
| #include <net/sctp/sm.h> |
| |
| /* Forward declarations for internal helpers. */ |
| static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *, |
| sctp_scope_t scope, gfp_t gfp, |
| int flags); |
| static void sctp_bind_addr_clean(struct sctp_bind_addr *); |
| |
| /* First Level Abstractions. */ |
| |
| /* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses |
| * in 'src' which have a broader scope than 'scope'. |
| */ |
| int sctp_bind_addr_copy(struct sctp_bind_addr *dest, |
| const struct sctp_bind_addr *src, |
| sctp_scope_t scope, gfp_t gfp, |
| int flags) |
| { |
| struct sctp_sockaddr_entry *addr; |
| struct list_head *pos; |
| int error = 0; |
| |
| /* All addresses share the same port. */ |
| dest->port = src->port; |
| |
| /* Extract the addresses which are relevant for this scope. */ |
| list_for_each(pos, &src->address_list) { |
| addr = list_entry(pos, struct sctp_sockaddr_entry, list); |
| error = sctp_copy_one_addr(dest, &addr->a_h, scope, |
| gfp, flags); |
| if (error < 0) |
| goto out; |
| } |
| |
| /* If there are no addresses matching the scope and |
| * this is global scope, try to get a link scope address, with |
| * the assumption that we must be sitting behind a NAT. |
| */ |
| if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) { |
| list_for_each(pos, &src->address_list) { |
| addr = list_entry(pos, struct sctp_sockaddr_entry, |
| list); |
| error = sctp_copy_one_addr(dest, &addr->a_h, |
| SCTP_SCOPE_LINK, gfp, |
| flags); |
| if (error < 0) |
| goto out; |
| } |
| } |
| |
| out: |
| if (error) |
| sctp_bind_addr_clean(dest); |
| |
| return error; |
| } |
| |
| /* Initialize the SCTP_bind_addr structure for either an endpoint or |
| * an association. |
| */ |
| void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port) |
| { |
| bp->malloced = 0; |
| |
| INIT_LIST_HEAD(&bp->address_list); |
| bp->port = port; |
| } |
| |
| /* Dispose of the address list. */ |
| static void sctp_bind_addr_clean(struct sctp_bind_addr *bp) |
| { |
| struct sctp_sockaddr_entry *addr; |
| struct list_head *pos, *temp; |
| |
| /* Empty the bind address list. */ |
| list_for_each_safe(pos, temp, &bp->address_list) { |
| addr = list_entry(pos, struct sctp_sockaddr_entry, list); |
| list_del(pos); |
| kfree(addr); |
| SCTP_DBG_OBJCNT_DEC(addr); |
| } |
| } |
| |
| /* Dispose of an SCTP_bind_addr structure */ |
| void sctp_bind_addr_free(struct sctp_bind_addr *bp) |
| { |
| /* Empty the bind address list. */ |
| sctp_bind_addr_clean(bp); |
| |
| if (bp->malloced) { |
| kfree(bp); |
| SCTP_DBG_OBJCNT_DEC(bind_addr); |
| } |
| } |
| |
| /* Add an address to the bind address list in the SCTP_bind_addr structure. */ |
| int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new, |
| __u8 use_as_src, gfp_t gfp) |
| { |
| struct sctp_sockaddr_entry *addr; |
| |
| /* Add the address to the bind address list. */ |
| addr = t_new(struct sctp_sockaddr_entry, gfp); |
| if (!addr) |
| return -ENOMEM; |
| |
| memcpy(&addr->a_h, new, sizeof(*new)); |
| |
| /* Fix up the port if it has not yet been set. |
| * Both v4 and v6 have the port at the same offset. |
| */ |
| if (!addr->a_h.v4.sin_port) |
| addr->a_h.v4.sin_port = bp->port; |
| |
| flip_to_n(&addr->a, &addr->a_h); |
| |
| addr->use_as_src = use_as_src; |
| |
| INIT_LIST_HEAD(&addr->list); |
| list_add_tail(&addr->list, &bp->address_list); |
| SCTP_DBG_OBJCNT_INC(addr); |
| |
| return 0; |
| } |
| |
| /* Delete an address from the bind address list in the SCTP_bind_addr |
| * structure. |
| */ |
| int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr) |
| { |
| struct list_head *pos, *temp; |
| struct sctp_sockaddr_entry *addr; |
| |
| list_for_each_safe(pos, temp, &bp->address_list) { |
| addr = list_entry(pos, struct sctp_sockaddr_entry, list); |
| if (sctp_cmp_addr_exact(&addr->a, del_addr)) { |
| /* Found the exact match. */ |
| list_del(pos); |
| kfree(addr); |
| SCTP_DBG_OBJCNT_DEC(addr); |
| |
| return 0; |
| } |
| } |
| |
| return -EINVAL; |
| } |
| |
| /* Create a network byte-order representation of all the addresses |
| * formated as SCTP parameters. |
| * |
| * The second argument is the return value for the length. |
| */ |
| union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, |
| int *addrs_len, |
| gfp_t gfp) |
| { |
| union sctp_params addrparms; |
| union sctp_params retval; |
| int addrparms_len; |
| union sctp_addr_param rawaddr; |
| int len; |
| struct sctp_sockaddr_entry *addr; |
| struct list_head *pos; |
| struct sctp_af *af; |
| |
| addrparms_len = 0; |
| len = 0; |
| |
| /* Allocate enough memory at once. */ |
| list_for_each(pos, &bp->address_list) { |
| len += sizeof(union sctp_addr_param); |
| } |
| |
| /* Don't even bother embedding an address if there |
| * is only one. |
| */ |
| if (len == sizeof(union sctp_addr_param)) { |
| retval.v = NULL; |
| goto end_raw; |
| } |
| |
| retval.v = kmalloc(len, gfp); |
| if (!retval.v) |
| goto end_raw; |
| |
| addrparms = retval; |
| |
| list_for_each(pos, &bp->address_list) { |
| addr = list_entry(pos, struct sctp_sockaddr_entry, list); |
| af = sctp_get_af_specific(addr->a_h.v4.sin_family); |
| len = af->to_addr_param(&addr->a_h, &rawaddr); |
| memcpy(addrparms.v, &rawaddr, len); |
| addrparms.v += len; |
| addrparms_len += len; |
| } |
| |
| end_raw: |
| *addrs_len = addrparms_len; |
| return retval; |
| } |
| |
| /* |
| * Create an address list out of the raw address list format (IPv4 and IPv6 |
| * address parameters). |
| */ |
| int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list, |
| int addrs_len, __u16 port, gfp_t gfp) |
| { |
| union sctp_addr_param *rawaddr; |
| struct sctp_paramhdr *param; |
| union sctp_addr addr; |
| int retval = 0; |
| int len; |
| struct sctp_af *af; |
| |
| /* Convert the raw address to standard address format */ |
| while (addrs_len) { |
| param = (struct sctp_paramhdr *)raw_addr_list; |
| rawaddr = (union sctp_addr_param *)raw_addr_list; |
| |
| af = sctp_get_af_specific(param_type2af(param->type)); |
| if (unlikely(!af)) { |
| retval = -EINVAL; |
| sctp_bind_addr_clean(bp); |
| break; |
| } |
| |
| af->from_addr_param(&addr, rawaddr, port, 0); |
| retval = sctp_add_bind_addr(bp, &addr, 1, gfp); |
| if (retval) { |
| /* Can't finish building the list, clean up. */ |
| sctp_bind_addr_clean(bp); |
| break; |
| } |
| |
| len = ntohs(param->length); |
| addrs_len -= len; |
| raw_addr_list += len; |
| } |
| |
| return retval; |
| } |
| |
| /******************************************************************** |
| * 2nd Level Abstractions |
| ********************************************************************/ |
| |
| /* Does this contain a specified address? Allow wildcarding. */ |
| int sctp_bind_addr_match(struct sctp_bind_addr *bp, |
| const union sctp_addr *addr, |
| struct sctp_sock *opt) |
| { |
| struct sctp_sockaddr_entry *laddr; |
| struct list_head *pos; |
| |
| list_for_each(pos, &bp->address_list) { |
| laddr = list_entry(pos, struct sctp_sockaddr_entry, list); |
| if (opt->pf->cmp_addr(&laddr->a, addr, opt)) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* 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; |
| struct list_head *pos; |
| int i; |
| |
| list_for_each(pos, &bp->address_list) { |
| laddr = list_entry(pos, struct sctp_sockaddr_entry, list); |
| |
| addr_buf = (union sctp_addr *)addrs; |
| for (i = 0; i < addrcnt; i++) { |
| addr = (union sctp_addr *)addr_buf; |
| af = sctp_get_af_specific(addr->v4.sin_family); |
| if (!af) |
| return NULL; |
| |
| if (opt->pf->cmp_addr(&laddr->a, addr, opt)) |
| break; |
| |
| addr_buf += af->sockaddr_len; |
| } |
| if (i == addrcnt) |
| return &laddr->a_h; |
| } |
| |
| return NULL; |
| } |
| |
| /* Copy out addresses from the global local address list. */ |
| static int sctp_copy_one_addr(struct sctp_bind_addr *dest, |
| union sctp_addr *addr, |
| sctp_scope_t scope, gfp_t gfp, |
| int flags) |
| { |
| int error = 0; |
| |
| if (sctp_is_any(addr)) { |
| error = sctp_copy_local_addr_list(dest, scope, gfp, flags); |
| } else if (sctp_in_scope(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_PEERSUPP))) || |
| (((AF_INET6 == addr->sa.sa_family) && |
| (flags & SCTP_ADDR6_ALLOWED) && |
| (flags & SCTP_ADDR6_PEERSUPP)))) |
| error = sctp_add_bind_addr(dest, addr, 1, gfp); |
| } |
| |
| return error; |
| } |
| |
| /* Is this a wildcard address? */ |
| int sctp_is_any(const union sctp_addr *addr) |
| { |
| struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family); |
| if (!af) |
| return 0; |
| return af->is_any(addr); |
| } |
| |
| /* Is 'addr' valid for 'scope'? */ |
| int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope) |
| { |
| sctp_scope_t 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 |
| * of requested destination address, sender and receiver |
| * SHOULD include all of its addresses with level greater |
| * than or equal to L. |
| */ |
| if (addr_scope <= scope) |
| return 1; |
| |
| return 0; |
| } |
| |
| /******************************************************************** |
| * 3rd Level Abstractions |
| ********************************************************************/ |
| |
| /* What is the scope of 'addr'? */ |
| sctp_scope_t 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); |
| } |