From a9153ec3040f54fa52b68e14dafed2aba7b780ae Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Wed, 7 Mar 2012 09:52:04 -0600 Subject: Initial import Code is based on FreeBSD 8.2 with USB support from Sebastian Huber and Thomas Doerfler. Initial TCP/IP stack work is from Kevel Kirspel. --- rtems/freebsd/kern/uipc_mbuf2.c | 455 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 455 insertions(+) create mode 100644 rtems/freebsd/kern/uipc_mbuf2.c (limited to 'rtems/freebsd/kern/uipc_mbuf2.c') diff --git a/rtems/freebsd/kern/uipc_mbuf2.c b/rtems/freebsd/kern/uipc_mbuf2.c new file mode 100644 index 00000000..210a2476 --- /dev/null +++ b/rtems/freebsd/kern/uipc_mbuf2.c @@ -0,0 +1,455 @@ +#include + +/* $KAME: uipc_mbuf2.c,v 1.31 2001/11/28 11:08:53 itojun Exp $ */ +/* $NetBSD: uipc_mbuf.c,v 1.40 1999/04/01 00:23:25 thorpej Exp $ */ + +/*- + * Copyright (C) 1999 WIDE Project. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the project nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ +/*- + * Copyright (c) 1982, 1986, 1988, 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)uipc_mbuf.c 8.4 (Berkeley) 2/14/95 + */ + +#include +__FBSDID("$FreeBSD$"); + +/*#define PULLDOWN_DEBUG*/ + +#include +#include +#include +#include +#include +#include +#include + +#include + +static MALLOC_DEFINE(M_PACKET_TAGS, MBUF_TAG_MEM_NAME, + "packet-attached information"); + +/* can't call it m_dup(), as freebsd[34] uses m_dup() with different arg */ +static struct mbuf *m_dup1(struct mbuf *, int, int, int); + +/* + * ensure that [off, off + len) is contiguous on the mbuf chain "m". + * packet chain before "off" is kept untouched. + * if offp == NULL, the target will start at on resulting chain. + * if offp != NULL, the target will start at on resulting chain. + * + * on error return (NULL return value), original "m" will be freed. + * + * XXX: M_TRAILINGSPACE/M_LEADINGSPACE only permitted on writable ext_buf. + */ +struct mbuf * +m_pulldown(struct mbuf *m, int off, int len, int *offp) +{ + struct mbuf *n, *o; + int hlen, tlen, olen; + int writable; + + /* check invalid arguments. */ + if (m == NULL) + panic("m == NULL in m_pulldown()"); + if (len > MCLBYTES) { + m_freem(m); + return NULL; /* impossible */ + } + +#ifdef PULLDOWN_DEBUG + { + struct mbuf *t; + printf("before:"); + for (t = m; t; t = t->m_next) + printf(" %d", t->m_len); + printf("\n"); + } +#endif + n = m; + while (n != NULL && off > 0) { + if (n->m_len > off) + break; + off -= n->m_len; + n = n->m_next; + } + /* be sure to point non-empty mbuf */ + while (n != NULL && n->m_len == 0) + n = n->m_next; + if (!n) { + m_freem(m); + return NULL; /* mbuf chain too short */ + } + + /* + * XXX: This code is flawed because it considers a "writable" mbuf + * data region to require all of the following: + * (i) mbuf _has_ to have M_EXT set; if it is just a regular + * mbuf, it is still not considered "writable." + * (ii) since mbuf has M_EXT, the ext_type _has_ to be + * EXT_CLUSTER. Anything else makes it non-writable. + * (iii) M_WRITABLE() must evaluate true. + * Ideally, the requirement should only be (iii). + * + * If we're writable, we're sure we're writable, because the ref. count + * cannot increase from 1, as that would require posession of mbuf + * n by someone else (which is impossible). However, if we're _not_ + * writable, we may eventually become writable )if the ref. count drops + * to 1), but we'll fail to notice it unless we re-evaluate + * M_WRITABLE(). For now, we only evaluate once at the beginning and + * live with this. + */ + /* + * XXX: This is dumb. If we're just a regular mbuf with no M_EXT, + * then we're not "writable," according to this code. + */ + writable = 0; + if ((n->m_flags & M_EXT) == 0 || + (n->m_ext.ext_type == EXT_CLUSTER && M_WRITABLE(n))) + writable = 1; + + /* + * the target data is on . + * if we got enough data on the mbuf "n", we're done. + */ + if ((off == 0 || offp) && len <= n->m_len - off && writable) + goto ok; + + /* + * when len <= n->m_len - off and off != 0, it is a special case. + * len bytes from sits in single mbuf, but the caller does + * not like the starting position (off). + * chop the current mbuf into two pieces, set off to 0. + */ + if (len <= n->m_len - off) { + o = m_dup1(n, off, n->m_len - off, M_DONTWAIT); + if (o == NULL) { + m_freem(m); + return NULL; /* ENOBUFS */ + } + n->m_len = off; + o->m_next = n->m_next; + n->m_next = o; + n = n->m_next; + off = 0; + goto ok; + } + + /* + * we need to take hlen from and tlen from m_next, 0>, + * and construct contiguous mbuf with m_len == len. + * note that hlen + tlen == len, and tlen > 0. + */ + hlen = n->m_len - off; + tlen = len - hlen; + + /* + * ensure that we have enough trailing data on mbuf chain. + * if not, we can do nothing about the chain. + */ + olen = 0; + for (o = n->m_next; o != NULL; o = o->m_next) + olen += o->m_len; + if (hlen + olen < len) { + m_freem(m); + return NULL; /* mbuf chain too short */ + } + + /* + * easy cases first. + * we need to use m_copydata() to get data from m_next, 0>. + */ + if ((off == 0 || offp) && M_TRAILINGSPACE(n) >= tlen + && writable) { + m_copydata(n->m_next, 0, tlen, mtod(n, caddr_t) + n->m_len); + n->m_len += tlen; + m_adj(n->m_next, tlen); + goto ok; + } + if ((off == 0 || offp) && M_LEADINGSPACE(n->m_next) >= hlen + && writable) { + n->m_next->m_data -= hlen; + n->m_next->m_len += hlen; + bcopy(mtod(n, caddr_t) + off, mtod(n->m_next, caddr_t), hlen); + n->m_len -= hlen; + n = n->m_next; + off = 0; + goto ok; + } + + /* + * now, we need to do the hard way. don't m_copy as there's no room + * on both end. + */ + if (len > MLEN) + o = m_getcl(M_DONTWAIT, m->m_type, 0); + else + o = m_get(M_DONTWAIT, m->m_type); + if (!o) { + m_freem(m); + return NULL; /* ENOBUFS */ + } + /* get hlen from into */ + o->m_len = hlen; + bcopy(mtod(n, caddr_t) + off, mtod(o, caddr_t), hlen); + n->m_len -= hlen; + /* get tlen from m_next, 0> into */ + m_copydata(n->m_next, 0, tlen, mtod(o, caddr_t) + o->m_len); + o->m_len += tlen; + m_adj(n->m_next, tlen); + o->m_next = n->m_next; + n->m_next = o; + n = o; + off = 0; + +ok: +#ifdef PULLDOWN_DEBUG + { + struct mbuf *t; + printf("after:"); + for (t = m; t; t = t->m_next) + printf("%c%d", t == n ? '*' : ' ', t->m_len); + printf(" (off=%d)\n", off); + } +#endif + if (offp) + *offp = off; + return n; +} + +static struct mbuf * +m_dup1(struct mbuf *m, int off, int len, int wait) +{ + struct mbuf *n; + int copyhdr; + + if (len > MCLBYTES) + return NULL; + if (off == 0 && (m->m_flags & M_PKTHDR) != 0) + copyhdr = 1; + else + copyhdr = 0; + if (len >= MINCLSIZE) { + if (copyhdr == 1) + n = m_getcl(wait, m->m_type, M_PKTHDR); + else + n = m_getcl(wait, m->m_type, 0); + } else { + if (copyhdr == 1) + n = m_gethdr(wait, m->m_type); + else + n = m_get(wait, m->m_type); + } + if (!n) + return NULL; /* ENOBUFS */ + + if (copyhdr && !m_dup_pkthdr(n, m, wait)) { + m_free(n); + return NULL; + } + m_copydata(m, off, len, mtod(n, caddr_t)); + n->m_len = len; + return n; +} + +/* Free a packet tag. */ +void +m_tag_free_default(struct m_tag *t) +{ +#ifdef MAC + if (t->m_tag_id == PACKET_TAG_MACLABEL) + mac_mbuf_tag_destroy(t); +#endif + free(t, M_PACKET_TAGS); +} + +/* Get a packet tag structure along with specified data following. */ +struct m_tag * +m_tag_alloc(u_int32_t cookie, int type, int len, int wait) +{ + struct m_tag *t; + + MBUF_CHECKSLEEP(wait); + if (len < 0) + return NULL; + t = malloc(len + sizeof(struct m_tag), M_PACKET_TAGS, wait); + if (t == NULL) + return NULL; + m_tag_setup(t, cookie, type, len); + t->m_tag_free = m_tag_free_default; + return t; +} + +/* Unlink and free a packet tag. */ +void +m_tag_delete(struct mbuf *m, struct m_tag *t) +{ + + KASSERT(m && t, ("m_tag_delete: null argument, m %p t %p", m, t)); + m_tag_unlink(m, t); + m_tag_free(t); +} + +/* Unlink and free a packet tag chain, starting from given tag. */ +void +m_tag_delete_chain(struct mbuf *m, struct m_tag *t) +{ + struct m_tag *p, *q; + + KASSERT(m, ("m_tag_delete_chain: null mbuf")); + if (t != NULL) + p = t; + else + p = SLIST_FIRST(&m->m_pkthdr.tags); + if (p == NULL) + return; + while ((q = SLIST_NEXT(p, m_tag_link)) != NULL) + m_tag_delete(m, q); + m_tag_delete(m, p); +} + +/* + * Strip off all tags that would normally vanish when + * passing through a network interface. Only persistent + * tags will exist after this; these are expected to remain + * so long as the mbuf chain exists, regardless of the + * path the mbufs take. + */ +void +m_tag_delete_nonpersistent(struct mbuf *m) +{ + struct m_tag *p, *q; + + SLIST_FOREACH_SAFE(p, &m->m_pkthdr.tags, m_tag_link, q) + if ((p->m_tag_id & MTAG_PERSISTENT) == 0) + m_tag_delete(m, p); +} + +/* Find a tag, starting from a given position. */ +struct m_tag * +m_tag_locate(struct mbuf *m, u_int32_t cookie, int type, struct m_tag *t) +{ + struct m_tag *p; + + KASSERT(m, ("m_tag_locate: null mbuf")); + if (t == NULL) + p = SLIST_FIRST(&m->m_pkthdr.tags); + else + p = SLIST_NEXT(t, m_tag_link); + while (p != NULL) { + if (p->m_tag_cookie == cookie && p->m_tag_id == type) + return p; + p = SLIST_NEXT(p, m_tag_link); + } + return NULL; +} + +/* Copy a single tag. */ +struct m_tag * +m_tag_copy(struct m_tag *t, int how) +{ + struct m_tag *p; + + MBUF_CHECKSLEEP(how); + KASSERT(t, ("m_tag_copy: null tag")); + p = m_tag_alloc(t->m_tag_cookie, t->m_tag_id, t->m_tag_len, how); + if (p == NULL) + return (NULL); +#ifdef MAC + /* + * XXXMAC: we should probably pass off the initialization, and + * copying here? can we hide that PACKET_TAG_MACLABEL is + * special from the mbuf code? + */ + if (t->m_tag_id == PACKET_TAG_MACLABEL) { + if (mac_mbuf_tag_init(p, how) != 0) { + m_tag_free(p); + return (NULL); + } + mac_mbuf_tag_copy(t, p); + } else +#endif + bcopy(t + 1, p + 1, t->m_tag_len); /* Copy the data */ + return p; +} + +/* + * Copy two tag chains. The destination mbuf (to) loses any attached + * tags even if the operation fails. This should not be a problem, as + * m_tag_copy_chain() is typically called with a newly-allocated + * destination mbuf. + */ +int +m_tag_copy_chain(struct mbuf *to, struct mbuf *from, int how) +{ + struct m_tag *p, *t, *tprev = NULL; + + MBUF_CHECKSLEEP(how); + KASSERT(to && from, + ("m_tag_copy_chain: null argument, to %p from %p", to, from)); + m_tag_delete_chain(to, NULL); + SLIST_FOREACH(p, &from->m_pkthdr.tags, m_tag_link) { + t = m_tag_copy(p, how); + if (t == NULL) { + m_tag_delete_chain(to, NULL); + return 0; + } + if (tprev == NULL) + SLIST_INSERT_HEAD(&to->m_pkthdr.tags, t, m_tag_link); + else + SLIST_INSERT_AFTER(tprev, t, m_tag_link); + tprev = t; + } + return 1; +} -- cgit v1.2.3