/* SCTP kernel implementation * Copyright (c) 2003 International Business Machines, Corp. * * This file is part of the SCTP kernel implementation * * These functions manipulate sctp SSN tracker. * * This SCTP 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. * * This SCTP 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, see * <http://www.gnu.org/licenses/>. * * Please send any bug reports or fixes you make to the * email address(es): * lksctp developers <linux-sctp@vger.kernel.org> * * Written or modified by: * Jon Grimm <jgrimm@us.ibm.com> */ #include <linux/types.h> #include <linux/slab.h> #include <net/sctp/sctp.h> #include <net/sctp/sm.h> static struct sctp_ssnmap *sctp_ssnmap_init(struct sctp_ssnmap *map, __u16 in, __u16 out); /* Storage size needed for map includes 2 headers and then the * specific needs of in or out streams. */ static inline size_t sctp_ssnmap_size(__u16 in, __u16 out) { return sizeof(struct sctp_ssnmap) + (in + out) * sizeof(__u16); } /* Create a new sctp_ssnmap. * Allocate room to store at least 'len' contiguous TSNs. */ struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, gfp_t gfp) { struct sctp_ssnmap *retval; int size; size = sctp_ssnmap_size(in, out); if (size <= KMALLOC_MAX_SIZE) retval = kmalloc(size, gfp); else retval = (struct sctp_ssnmap *) __get_free_pages(gfp, get_order(size)); if (!retval) goto fail; if (!sctp_ssnmap_init(retval, in, out)) goto fail_map; SCTP_DBG_OBJCNT_INC(ssnmap); return retval; fail_map: if (size <= KMALLOC_MAX_SIZE) kfree(retval); else free_pages((unsigned long)retval, get_order(size)); fail: return NULL; } /* Initialize a block of memory as a ssnmap. */ static struct sctp_ssnmap *sctp_ssnmap_init(struct sctp_ssnmap *map, __u16 in, __u16 out) { memset(map, 0x00, sctp_ssnmap_size(in, out)); /* Start 'in' stream just after the map header. */ map->in.ssn = (__u16 *)&map[1]; map->in.len = in; /* Start 'out' stream just after 'in'. */ map->out.ssn = &map->in.ssn[in]; map->out.len = out; return map; } /* Clear out the ssnmap streams. */ void sctp_ssnmap_clear(struct sctp_ssnmap *map) { size_t size; size = (map->in.len + map->out.len) * sizeof(__u16); memset(map->in.ssn, 0x00, size); } /* Dispose of a ssnmap. */ void sctp_ssnmap_free(struct sctp_ssnmap *map) { int size; if (unlikely(!map)) return; size = sctp_ssnmap_size(map->in.len, map->out.len); if (size <= KMALLOC_MAX_SIZE) kfree(map); else free_pages((unsigned long)map, get_order(size)); SCTP_DBG_OBJCNT_DEC(ssnmap); }