/* SCTP kernel reference Implementation * Copyright (c) Cisco 1999,2000 * Copyright (c) Motorola 1999,2000,2001 * Copyright (c) International Business Machines Corp., 2001,2002 * 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, int 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, int 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, 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, SCTP_SCOPE_LINK, gfp, flags); if (error < 0) goto out; } } out: if (error) sctp_bind_addr_clean(dest); return error; } /* Create a new SCTP_bind_addr from nothing. */ struct sctp_bind_addr *sctp_bind_addr_new(int gfp) { struct sctp_bind_addr *retval; retval = t_new(struct sctp_bind_addr, gfp); if (!retval) goto nomem; sctp_bind_addr_init(retval, 0); retval->malloced = 1; SCTP_DBG_OBJCNT_INC(bind_addr); nomem: return retval; } /* 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, int 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, 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.v4.sin_port) addr->a.v4.sin_port = bp->port; 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, int 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; 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); len = sockaddr2sctp_addr(&addr->a, &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, int gfp) { union sctp_addr_param *rawaddr; struct sctp_paramhdr *param; union sctp_addr addr; int retval = 0; int len; /* 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; switch (param->type) { case SCTP_PARAM_IPV4_ADDRESS: case SCTP_PARAM_IPV6_ADDRESS: sctp_param2sockaddr(&addr, rawaddr, port, 0); retval = sctp_add_bind_addr(bp, &addr, 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; break; default: /* Corrupted raw addr list! */ retval = -EINVAL; sctp_bind_addr_clean(bp); break; } if (retval) break; } 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_opt *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; } /* 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, int 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, 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); }