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c0b99ffa02
flags relating to several aspects of socket functionality. This change breaks out several bits relating to send and receive operation into a new per-socket buffer field, sb_state, in order to facilitate locking. This is required because, in order to provide more granular locking of sockets, different state fields have different locking properties. The following fields are moved to sb_state: SS_CANTRCVMORE (so_state) SS_CANTSENDMORE (so_state) SS_RCVATMARK (so_state) Rename respectively to: SBS_CANTRCVMORE (so_rcv.sb_state) SBS_CANTSENDMORE (so_snd.sb_state) SBS_RCVATMARK (so_rcv.sb_state) This facilitates locking by isolating fields to be located with other identically locked fields, and permits greater granularity in socket locking by avoiding storing fields with different locking semantics in the same short (avoiding locking conflicts). In the future, we may wish to coallesce sb_state and sb_flags; for the time being I leave them separate and there is no additional memory overhead due to the packing/alignment of shorts in the socket buffer structure.
362 lines
8.6 KiB
C
362 lines
8.6 KiB
C
/*
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* Copyright (c) 2000 Paycounter, Inc.
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* Author: Alfred Perlstein <alfred@paycounter.com>, <alfred@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#define ACCEPT_FILTER_MOD
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/signalvar.h>
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#include <sys/sysctl.h>
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#include <sys/socketvar.h>
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/* check for GET/HEAD */
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static void sohashttpget(struct socket *so, void *arg, int waitflag);
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/* check for HTTP/1.0 or HTTP/1.1 */
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static void soparsehttpvers(struct socket *so, void *arg, int waitflag);
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/* check for end of HTTP/1.x request */
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static void soishttpconnected(struct socket *so, void *arg, int waitflag);
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/* strcmp on an mbuf chain */
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static int mbufstrcmp(struct mbuf *m, struct mbuf *npkt, int offset, char *cmp);
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/* strncmp on an mbuf chain */
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static int mbufstrncmp(struct mbuf *m, struct mbuf *npkt, int offset,
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int max, char *cmp);
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/* socketbuffer is full */
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static int sbfull(struct sockbuf *sb);
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static struct accept_filter accf_http_filter = {
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"httpready",
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sohashttpget,
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NULL,
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NULL
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};
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static moduledata_t accf_http_mod = {
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"accf_http",
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accept_filt_generic_mod_event,
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&accf_http_filter
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};
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DECLARE_MODULE(accf_http, accf_http_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
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static int parse_http_version = 1;
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SYSCTL_NODE(_net_inet_accf, OID_AUTO, http, CTLFLAG_RW, 0,
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"HTTP accept filter");
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SYSCTL_INT(_net_inet_accf_http, OID_AUTO, parsehttpversion, CTLFLAG_RW,
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&parse_http_version, 1,
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"Parse http version so that non 1.x requests work");
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#ifdef ACCF_HTTP_DEBUG
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#define DPRINT(fmt, args...) \
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do { \
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printf("%s:%d: " fmt "\n", __func__, __LINE__, ##args); \
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} while (0)
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#else
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#define DPRINT(fmt, args...)
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#endif
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static int
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sbfull(struct sockbuf *sb)
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{
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DPRINT("sbfull, cc(%ld) >= hiwat(%ld): %d, "
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"mbcnt(%ld) >= mbmax(%ld): %d",
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sb->sb_cc, sb->sb_hiwat, sb->sb_cc >= sb->sb_hiwat,
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sb->sb_mbcnt, sb->sb_mbmax, sb->sb_mbcnt >= sb->sb_mbmax);
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return (sb->sb_cc >= sb->sb_hiwat || sb->sb_mbcnt >= sb->sb_mbmax);
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}
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/*
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* start at mbuf m, (must provide npkt if exists)
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* starting at offset in m compare characters in mbuf chain for 'cmp'
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*/
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static int
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mbufstrcmp(struct mbuf *m, struct mbuf *npkt, int offset, char *cmp)
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{
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struct mbuf *n;
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for (; m != NULL; m = n) {
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n = npkt;
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if (npkt)
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npkt = npkt->m_nextpkt;
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for (; m; m = m->m_next) {
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for (; offset < m->m_len; offset++, cmp++) {
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if (*cmp == '\0')
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return (1);
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else if (*cmp != *(mtod(m, char *) + offset))
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return (0);
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}
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if (*cmp == '\0')
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return (1);
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offset = 0;
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}
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}
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return (0);
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}
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/*
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* start at mbuf m, (must provide npkt if exists)
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* starting at offset in m compare characters in mbuf chain for 'cmp'
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* stop at 'max' characters
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*/
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static int
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mbufstrncmp(struct mbuf *m, struct mbuf *npkt, int offset, int max, char *cmp)
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{
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struct mbuf *n;
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for (; m != NULL; m = n) {
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n = npkt;
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if (npkt)
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npkt = npkt->m_nextpkt;
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for (; m; m = m->m_next) {
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for (; offset < m->m_len; offset++, cmp++, max--) {
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if (max == 0 || *cmp == '\0')
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return (1);
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else if (*cmp != *(mtod(m, char *) + offset))
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return (0);
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}
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if (max == 0 || *cmp == '\0')
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return (1);
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offset = 0;
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}
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}
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return (0);
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}
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#define STRSETUP(sptr, slen, str) \
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do { \
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sptr = str; \
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slen = sizeof(str) - 1; \
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} while(0)
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static void
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sohashttpget(struct socket *so, void *arg, int waitflag)
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{
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if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 && !sbfull(&so->so_rcv)) {
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struct mbuf *m;
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char *cmp;
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int cmplen, cc;
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m = so->so_rcv.sb_mb;
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cc = so->so_rcv.sb_cc - 1;
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if (cc < 1)
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return;
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switch (*mtod(m, char *)) {
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case 'G':
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STRSETUP(cmp, cmplen, "ET ");
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break;
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case 'H':
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STRSETUP(cmp, cmplen, "EAD ");
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break;
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default:
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goto fallout;
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}
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if (cc < cmplen) {
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if (mbufstrncmp(m, m->m_nextpkt, 1, cc, cmp) == 1) {
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DPRINT("short cc (%d) but mbufstrncmp ok", cc);
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return;
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} else {
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DPRINT("short cc (%d) mbufstrncmp failed", cc);
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goto fallout;
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}
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}
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if (mbufstrcmp(m, m->m_nextpkt, 1, cmp) == 1) {
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DPRINT("mbufstrcmp ok");
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if (parse_http_version == 0)
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soishttpconnected(so, arg, waitflag);
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else
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soparsehttpvers(so, arg, waitflag);
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return;
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}
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DPRINT("mbufstrcmp bad");
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}
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fallout:
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DPRINT("fallout");
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so->so_upcall = NULL;
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so->so_rcv.sb_flags &= ~SB_UPCALL;
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soisconnected(so);
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return;
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}
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static void
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soparsehttpvers(struct socket *so, void *arg, int waitflag)
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{
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struct mbuf *m, *n;
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int i, cc, spaces, inspaces;
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if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) != 0 || sbfull(&so->so_rcv))
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goto fallout;
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m = so->so_rcv.sb_mb;
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cc = so->so_rcv.sb_cc;
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inspaces = spaces = 0;
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for (m = so->so_rcv.sb_mb; m; m = n) {
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n = m->m_nextpkt;
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for (; m; m = m->m_next) {
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for (i = 0; i < m->m_len; i++, cc--) {
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switch (*(mtod(m, char *) + i)) {
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case ' ':
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/* tabs? '\t' */
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if (!inspaces) {
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spaces++;
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inspaces = 1;
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}
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break;
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case '\r':
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case '\n':
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DPRINT("newline");
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goto fallout;
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default:
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if (spaces != 2) {
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inspaces = 0;
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break;
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}
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/*
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* if we don't have enough characters
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* left (cc < sizeof("HTTP/1.0") - 1)
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* then see if the remaining ones
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* are a request we can parse.
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*/
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if (cc < sizeof("HTTP/1.0") - 1) {
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if (mbufstrncmp(m, n, i, cc,
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"HTTP/1.") == 1) {
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DPRINT("ok");
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goto readmore;
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} else {
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DPRINT("bad");
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goto fallout;
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}
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} else if (
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mbufstrcmp(m, n, i, "HTTP/1.0") ||
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mbufstrcmp(m, n, i, "HTTP/1.1")) {
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DPRINT("ok");
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soishttpconnected(so,
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arg, waitflag);
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return;
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} else {
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DPRINT("bad");
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goto fallout;
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}
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}
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}
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}
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}
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readmore:
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DPRINT("readmore");
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/*
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* if we hit here we haven't hit something
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* we don't understand or a newline, so try again
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*/
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so->so_upcall = soparsehttpvers;
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so->so_rcv.sb_flags |= SB_UPCALL;
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return;
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fallout:
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DPRINT("fallout");
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so->so_upcall = NULL;
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so->so_rcv.sb_flags &= ~SB_UPCALL;
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soisconnected(so);
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return;
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}
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#define NCHRS 3
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static void
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soishttpconnected(struct socket *so, void *arg, int waitflag)
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{
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char a, b, c;
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struct mbuf *m, *n;
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int ccleft, copied;
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DPRINT("start");
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if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) != 0 || sbfull(&so->so_rcv))
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goto gotit;
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/*
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* Walk the socketbuffer and copy the last NCHRS (3) into a, b, and c
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* copied - how much we've copied so far
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* ccleft - how many bytes remaining in the socketbuffer
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* just loop over the mbufs subtracting from 'ccleft' until we only
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* have NCHRS left
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*/
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copied = 0;
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ccleft = so->so_rcv.sb_cc;
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if (ccleft < NCHRS)
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goto readmore;
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a = b = c = '\0';
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for (m = so->so_rcv.sb_mb; m; m = n) {
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n = m->m_nextpkt;
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for (; m; m = m->m_next) {
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ccleft -= m->m_len;
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if (ccleft <= NCHRS) {
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char *src;
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int tocopy;
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tocopy = (NCHRS - ccleft) - copied;
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src = mtod(m, char *) + (m->m_len - tocopy);
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while (tocopy--) {
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switch (copied++) {
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case 0:
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a = *src++;
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break;
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case 1:
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b = *src++;
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break;
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case 2:
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c = *src++;
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break;
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}
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}
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}
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}
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}
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if (c == '\n' && (b == '\n' || (b == '\r' && a == '\n'))) {
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/* we have all request headers */
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goto gotit;
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}
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readmore:
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so->so_upcall = soishttpconnected;
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so->so_rcv.sb_flags |= SB_UPCALL;
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return;
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gotit:
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so->so_upcall = NULL;
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so->so_rcv.sb_flags &= ~SB_UPCALL;
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soisconnected(so);
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return;
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}
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