715 lines
17 KiB
C
715 lines
17 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 2018 Universita` di Pisa
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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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*
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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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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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//#define NMREQ_DEBUG
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#ifdef NMREQ_DEBUG
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#define NETMAP_WITH_LIBS
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#define ED(...) D(__VA_ARGS__)
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#else
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#define ED(...)
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/* an identifier is a possibly empty sequence of alphanum characters and
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* underscores
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*/
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static int
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nm_is_identifier(const char *s, const char *e)
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{
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for (; s != e; s++) {
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if (!isalnum(*s) && *s != '_') {
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return 0;
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}
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}
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return 1;
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}
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#endif /* NMREQ_DEBUG */
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#include <net/netmap_user.h>
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#define LIBNETMAP_NOTHREADSAFE
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#include "libnetmap.h"
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void
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nmreq_push_option(struct nmreq_header *h, struct nmreq_option *o)
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{
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o->nro_next = h->nr_options;
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h->nr_options = (uintptr_t)o;
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}
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struct nmreq_prefix {
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const char *prefix; /* the constant part of the prefix */
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size_t len; /* its strlen() */
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uint32_t flags;
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#define NR_P_ID (1U << 0) /* whether an identifier is needed */
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#define NR_P_SKIP (1U << 1) /* whether the scope must be passed to netmap */
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#define NR_P_EMPTYID (1U << 2) /* whether an empty identifier is allowed */
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};
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#define declprefix(prefix, flags) { (prefix), (sizeof(prefix) - 1), (flags) }
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static struct nmreq_prefix nmreq_prefixes[] = {
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declprefix("netmap", NR_P_SKIP),
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declprefix(NM_BDG_NAME, NR_P_ID|NR_P_EMPTYID),
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{ NULL } /* terminate the list */
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};
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void
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nmreq_header_init(struct nmreq_header *h, uint16_t reqtype, void *body)
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{
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memset(h, 0, sizeof(*h));
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h->nr_version = NETMAP_API;
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h->nr_reqtype = reqtype;
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h->nr_body = (uintptr_t)body;
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}
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int
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nmreq_header_decode(const char **pifname, struct nmreq_header *h, struct nmctx *ctx)
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{
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const char *scan = NULL;
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const char *vpname = NULL;
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const char *pipesep = NULL;
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u_int namelen;
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const char *ifname = *pifname;
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struct nmreq_prefix *p;
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scan = ifname;
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for (p = nmreq_prefixes; p->prefix != NULL; p++) {
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if (!strncmp(scan, p->prefix, p->len))
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break;
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}
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if (p->prefix == NULL) {
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nmctx_ferror(ctx, "%s: invalid request, prefix unknown or missing", *pifname);
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goto fail;
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}
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scan += p->len;
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vpname = index(scan, ':');
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if (vpname == NULL) {
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nmctx_ferror(ctx, "%s: missing ':'", ifname);
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goto fail;
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}
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if (vpname != scan) {
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/* there is an identifier, can we accept it? */
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if (!(p->flags & NR_P_ID)) {
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nmctx_ferror(ctx, "%s: no identifier allowed between '%s' and ':'", *pifname, p->prefix);
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goto fail;
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}
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if (!nm_is_identifier(scan, vpname)) {
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nmctx_ferror(ctx, "%s: invalid identifier '%.*s'", *pifname, vpname - scan, scan);
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goto fail;
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}
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} else {
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if ((p->flags & NR_P_ID) && !(p->flags & NR_P_EMPTYID)) {
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nmctx_ferror(ctx, "%s: identifier is missing between '%s' and ':'", *pifname, p->prefix);
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goto fail;
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}
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}
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++vpname; /* skip the colon */
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if (p->flags & NR_P_SKIP)
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ifname = vpname;
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scan = vpname;
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/* scan for a separator */
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for (; *scan && !index("-*^/@", *scan); scan++)
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;
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/* search for possible pipe indicators */
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for (pipesep = vpname; pipesep != scan && !index("{}", *pipesep); pipesep++)
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;
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if (!nm_is_identifier(vpname, pipesep)) {
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nmctx_ferror(ctx, "%s: invalid port name '%.*s'", *pifname,
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pipesep - vpname, vpname);
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goto fail;
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}
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if (pipesep != scan) {
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pipesep++;
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if (*pipesep == '\0') {
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nmctx_ferror(ctx, "%s: invalid empty pipe name", *pifname);
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goto fail;
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}
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if (!nm_is_identifier(pipesep, scan)) {
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nmctx_ferror(ctx, "%s: invalid pipe name '%.*s'", *pifname, scan - pipesep, pipesep);
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goto fail;
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}
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}
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namelen = scan - ifname;
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if (namelen >= sizeof(h->nr_name)) {
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nmctx_ferror(ctx, "name '%.*s' too long", namelen, ifname);
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goto fail;
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}
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if (namelen == 0) {
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nmctx_ferror(ctx, "%s: invalid empty port name", *pifname);
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goto fail;
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}
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/* fill the header */
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memcpy(h->nr_name, ifname, namelen);
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h->nr_name[namelen] = '\0';
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ED("name %s", h->nr_name);
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*pifname = scan;
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return 0;
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fail:
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errno = EINVAL;
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return -1;
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}
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/*
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* 0 not recognized
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* -1 error
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* >= 0 mem_id
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*/
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int32_t
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nmreq_get_mem_id(const char **pifname, struct nmctx *ctx)
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{
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int fd = -1;
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struct nmreq_header gh;
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struct nmreq_port_info_get gb;
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const char *ifname;
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errno = 0;
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ifname = *pifname;
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if (ifname == NULL)
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goto fail;
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/* try to look for a netmap port with this name */
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fd = open("/dev/netmap", O_RDWR);
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if (fd < 0) {
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nmctx_ferror(ctx, "cannot open /dev/netmap: %s", strerror(errno));
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goto fail;
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}
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nmreq_header_init(&gh, NETMAP_REQ_PORT_INFO_GET, &gb);
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if (nmreq_header_decode(&ifname, &gh, ctx) < 0) {
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goto fail;
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}
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memset(&gb, 0, sizeof(gb));
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if (ioctl(fd, NIOCCTRL, &gh) < 0) {
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nmctx_ferror(ctx, "cannot get info for '%s': %s", *pifname, strerror(errno));
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goto fail;
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}
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*pifname = ifname;
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close(fd);
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return gb.nr_mem_id;
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fail:
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if (fd >= 0)
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close(fd);
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if (!errno)
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errno = EINVAL;
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return -1;
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}
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int
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nmreq_register_decode(const char **pifname, struct nmreq_register *r, struct nmctx *ctx)
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{
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enum { P_START, P_RNGSFXOK, P_GETNUM, P_FLAGS, P_FLAGSOK, P_MEMID, P_ONESW } p_state;
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long num;
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const char *scan = *pifname;
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uint32_t nr_mode;
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uint16_t nr_mem_id;
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uint16_t nr_ringid;
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uint64_t nr_flags;
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/* fill the request */
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p_state = P_START;
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/* defaults */
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nr_mode = NR_REG_ALL_NIC; /* default for no suffix */
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nr_mem_id = r->nr_mem_id; /* if non-zero, further updates are disabled */
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nr_ringid = 0;
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nr_flags = 0;
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while (*scan) {
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switch (p_state) {
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case P_START:
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switch (*scan) {
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case '^': /* only SW ring */
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nr_mode = NR_REG_SW;
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p_state = P_ONESW;
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break;
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case '*': /* NIC and SW */
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nr_mode = NR_REG_NIC_SW;
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p_state = P_RNGSFXOK;
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break;
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case '-': /* one NIC ring pair */
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nr_mode = NR_REG_ONE_NIC;
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p_state = P_GETNUM;
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break;
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case '/': /* start of flags */
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p_state = P_FLAGS;
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break;
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case '@': /* start of memid */
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p_state = P_MEMID;
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break;
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default:
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nmctx_ferror(ctx, "unknown modifier: '%c'", *scan);
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goto fail;
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}
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scan++;
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break;
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case P_RNGSFXOK:
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switch (*scan) {
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case '/':
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p_state = P_FLAGS;
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break;
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case '@':
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p_state = P_MEMID;
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break;
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default:
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nmctx_ferror(ctx, "unexpected character: '%c'", *scan);
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goto fail;
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}
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scan++;
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break;
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case P_GETNUM:
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if (!isdigit(*scan)) {
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nmctx_ferror(ctx, "got '%s' while expecting a number", scan);
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goto fail;
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}
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num = strtol(scan, (char **)&scan, 10);
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if (num < 0 || num >= NETMAP_RING_MASK) {
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nmctx_ferror(ctx, "'%ld' out of range [0, %d)",
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num, NETMAP_RING_MASK);
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goto fail;
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}
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nr_ringid = num & NETMAP_RING_MASK;
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p_state = P_RNGSFXOK;
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break;
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case P_FLAGS:
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case P_FLAGSOK:
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switch (*scan) {
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case '@':
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p_state = P_MEMID;
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scan++;
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continue;
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case 'x':
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nr_flags |= NR_EXCLUSIVE;
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break;
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case 'z':
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nr_flags |= NR_ZCOPY_MON;
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break;
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case 't':
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nr_flags |= NR_MONITOR_TX;
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break;
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case 'r':
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nr_flags |= NR_MONITOR_RX;
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break;
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case 'R':
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nr_flags |= NR_RX_RINGS_ONLY;
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break;
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case 'T':
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nr_flags |= NR_TX_RINGS_ONLY;
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break;
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default:
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nmctx_ferror(ctx, "unrecognized flag: '%c'", *scan);
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goto fail;
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}
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scan++;
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p_state = P_FLAGSOK;
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break;
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case P_MEMID:
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if (!isdigit(*scan)) {
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scan--; /* escape to options */
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goto out;
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}
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num = strtol(scan, (char **)&scan, 10);
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if (num <= 0) {
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nmctx_ferror(ctx, "invalid mem_id: '%ld'", num);
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goto fail;
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}
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if (nr_mem_id && nr_mem_id != num) {
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nmctx_ferror(ctx, "invalid setting of mem_id to %ld (already set to %"PRIu16")", num, nr_mem_id);
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goto fail;
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}
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nr_mem_id = num;
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p_state = P_RNGSFXOK;
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break;
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case P_ONESW:
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if (!isdigit(*scan)) {
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p_state = P_RNGSFXOK;
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} else {
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nr_mode = NR_REG_ONE_SW;
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p_state = P_GETNUM;
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}
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break;
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}
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}
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if (p_state == P_MEMID && !*scan) {
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nmctx_ferror(ctx, "invalid empty mem_id");
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goto fail;
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}
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if (p_state != P_START && p_state != P_RNGSFXOK &&
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p_state != P_FLAGSOK && p_state != P_MEMID && p_state != P_ONESW) {
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nmctx_ferror(ctx, "unexpected end of request");
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goto fail;
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}
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out:
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ED("flags: %s %s %s %s %s %s",
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(nr_flags & NR_EXCLUSIVE) ? "EXCLUSIVE" : "",
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(nr_flags & NR_ZCOPY_MON) ? "ZCOPY_MON" : "",
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(nr_flags & NR_MONITOR_TX) ? "MONITOR_TX" : "",
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(nr_flags & NR_MONITOR_RX) ? "MONITOR_RX" : "",
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(nr_flags & NR_RX_RINGS_ONLY) ? "RX_RINGS_ONLY" : "",
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(nr_flags & NR_TX_RINGS_ONLY) ? "TX_RINGS_ONLY" : "");
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r->nr_mode = nr_mode;
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r->nr_ringid = nr_ringid;
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r->nr_flags = nr_flags;
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r->nr_mem_id = nr_mem_id;
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*pifname = scan;
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return 0;
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fail:
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if (!errno)
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errno = EINVAL;
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return -1;
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}
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static int
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nmreq_option_parsekeys(const char *prefix, char *body, struct nmreq_opt_parser *p,
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struct nmreq_parse_ctx *pctx)
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{
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char *scan;
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char delim1;
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struct nmreq_opt_key *k;
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scan = body;
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delim1 = *scan;
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while (delim1 != '\0') {
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char *key, *value;
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char delim;
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size_t vlen;
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key = scan;
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for ( scan++; *scan != '\0' && *scan != '=' && *scan != ','; scan++) {
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if (*scan == '-')
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*scan = '_';
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}
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delim = *scan;
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*scan = '\0';
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scan++;
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for (k = p->keys; (k - p->keys) < NMREQ_OPT_MAXKEYS && k->key != NULL;
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k++) {
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if (!strcmp(k->key, key))
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goto found;
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}
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nmctx_ferror(pctx->ctx, "unknown key: '%s'", key);
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errno = EINVAL;
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return -1;
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found:
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if (pctx->keys[k->id] != NULL) {
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nmctx_ferror(pctx->ctx, "option '%s': duplicate key '%s', already set to '%s'",
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prefix, key, pctx->keys[k->id]);
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errno = EINVAL;
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return -1;
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}
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value = scan;
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for ( ; *scan != '\0' && *scan != ','; scan++)
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;
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delim1 = *scan;
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*scan = '\0';
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vlen = scan - value;
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scan++;
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if (delim == '=') {
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pctx->keys[k->id] = (vlen ? value : NULL);
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} else {
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if (!(k->flags & NMREQ_OPTK_ALLOWEMPTY)) {
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nmctx_ferror(pctx->ctx, "option '%s': missing '=value' for key '%s'",
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prefix, key);
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errno = EINVAL;
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return -1;
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}
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pctx->keys[k->id] = key;
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}
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}
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/* now check that all no-default keys have been assigned */
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for (k = p->keys; (k - p->keys) < NMREQ_OPT_MAXKEYS && k->key != NULL; k++) {
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if ((k->flags & NMREQ_OPTK_MUSTSET) && pctx->keys[k->id] == NULL) {
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nmctx_ferror(pctx->ctx, "option '%s': mandatory key '%s' not assigned",
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prefix, k->key);
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errno = EINVAL;
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return -1;
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}
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}
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return 0;
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}
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static int
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nmreq_option_decode1(char *opt, struct nmreq_opt_parser *parsers,
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void *token, struct nmctx *ctx)
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{
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struct nmreq_opt_parser *p;
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const char *prefix;
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char *scan;
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char delim;
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struct nmreq_parse_ctx pctx;
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int i;
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prefix = opt;
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/* find the delimiter */
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for (scan = opt; *scan != '\0' && *scan != ':' && *scan != '='; scan++)
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;
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delim = *scan;
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*scan = '\0';
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scan++;
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/* find the prefix */
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for (p = parsers; p != NULL; p = p->next) {
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if (!strcmp(prefix, p->prefix))
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break;
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}
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if (p == NULL) {
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nmctx_ferror(ctx, "unknown option: '%s'", prefix);
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errno = EINVAL;
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return -1;
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}
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if (p->flags & NMREQ_OPTF_DISABLED) {
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nmctx_ferror(ctx, "option '%s' is not supported", prefix);
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errno = EOPNOTSUPP;
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return -1;
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}
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/* prepare the parse context */
|
|
pctx.ctx = ctx;
|
|
pctx.token = token;
|
|
for (i = 0; i < NMREQ_OPT_MAXKEYS; i++)
|
|
pctx.keys[i] = NULL;
|
|
switch (delim) {
|
|
case '\0':
|
|
/* no body */
|
|
if (!(p->flags & NMREQ_OPTF_ALLOWEMPTY)) {
|
|
nmctx_ferror(ctx, "syntax error: missing body after '%s'",
|
|
prefix);
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
break;
|
|
case '=': /* the body goes to the default option key, if any */
|
|
if (p->default_key < 0 || p->default_key >= NMREQ_OPT_MAXKEYS) {
|
|
nmctx_ferror(ctx, "syntax error: '=' not valid after '%s'",
|
|
prefix);
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
if (*scan == '\0') {
|
|
nmctx_ferror(ctx, "missing value for option '%s'", prefix);
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
pctx.keys[p->default_key] = scan;
|
|
break;
|
|
case ':': /* parse 'key=value' strings */
|
|
if (nmreq_option_parsekeys(prefix, scan, p, &pctx) < 0)
|
|
return -1;
|
|
break;
|
|
}
|
|
return p->parse(&pctx);
|
|
}
|
|
|
|
int
|
|
nmreq_options_decode(const char *opt, struct nmreq_opt_parser parsers[],
|
|
void *token, struct nmctx *ctx)
|
|
{
|
|
const char *scan, *opt1;
|
|
char *w;
|
|
size_t len;
|
|
int ret;
|
|
|
|
if (*opt == '\0')
|
|
return 0; /* empty list, OK */
|
|
|
|
if (*opt != '@') {
|
|
nmctx_ferror(ctx, "option list does not start with '@'");
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
scan = opt;
|
|
do {
|
|
scan++; /* skip the plus */
|
|
opt1 = scan; /* start of option */
|
|
/* find the end of the option */
|
|
for ( ; *scan != '\0' && *scan != '@'; scan++)
|
|
;
|
|
len = scan - opt1;
|
|
if (len == 0) {
|
|
nmctx_ferror(ctx, "invalid empty option");
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
w = nmctx_malloc(ctx, len + 1);
|
|
if (w == NULL) {
|
|
nmctx_ferror(ctx, "out of memory");
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
memcpy(w, opt1, len);
|
|
w[len] = '\0';
|
|
ret = nmreq_option_decode1(w, parsers, token, ctx);
|
|
nmctx_free(ctx, w);
|
|
if (ret < 0)
|
|
return -1;
|
|
} while (*scan != '\0');
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct nmreq_option *
|
|
nmreq_find_option(struct nmreq_header *h, uint32_t t)
|
|
{
|
|
struct nmreq_option *o;
|
|
|
|
for (o = (struct nmreq_option *)h->nr_options; o != NULL;
|
|
o = (struct nmreq_option *)o->nro_next) {
|
|
if (o->nro_reqtype == t)
|
|
break;
|
|
}
|
|
return o;
|
|
}
|
|
|
|
void
|
|
nmreq_remove_option(struct nmreq_header *h, struct nmreq_option *o)
|
|
{
|
|
struct nmreq_option **nmo;
|
|
|
|
for (nmo = (struct nmreq_option **)&h->nr_options; *nmo != NULL;
|
|
nmo = (struct nmreq_option **)&(*nmo)->nro_next) {
|
|
if (*nmo == o) {
|
|
*((uint64_t *)(*nmo)) = o->nro_next;
|
|
o->nro_next = (uint64_t)(uintptr_t)NULL;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
nmreq_free_options(struct nmreq_header *h)
|
|
{
|
|
struct nmreq_option *o, *next;
|
|
|
|
for (o = (struct nmreq_option *)h->nr_options; o != NULL; o = next) {
|
|
next = (struct nmreq_option *)o->nro_next;
|
|
free(o);
|
|
}
|
|
}
|
|
|
|
const char*
|
|
nmreq_option_name(uint32_t nro_reqtype)
|
|
{
|
|
switch (nro_reqtype) {
|
|
case NETMAP_REQ_OPT_EXTMEM:
|
|
return "extmem";
|
|
case NETMAP_REQ_OPT_SYNC_KLOOP_EVENTFDS:
|
|
return "sync-kloop-eventfds";
|
|
case NETMAP_REQ_OPT_CSB:
|
|
return "csb";
|
|
case NETMAP_REQ_OPT_SYNC_KLOOP_MODE:
|
|
return "sync-kloop-mode";
|
|
default:
|
|
return "unknown";
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
#include <inttypes.h>
|
|
static void
|
|
nmreq_dump(struct nmport_d *d)
|
|
{
|
|
printf("header:\n");
|
|
printf(" nr_version: %"PRIu16"\n", d->hdr.nr_version);
|
|
printf(" nr_reqtype: %"PRIu16"\n", d->hdr.nr_reqtype);
|
|
printf(" nr_reserved: %"PRIu32"\n", d->hdr.nr_reserved);
|
|
printf(" nr_name: %s\n", d->hdr.nr_name);
|
|
printf(" nr_options: %lx\n", (unsigned long)d->hdr.nr_options);
|
|
printf(" nr_body: %lx\n", (unsigned long)d->hdr.nr_body);
|
|
printf("\n");
|
|
printf("register (%p):\n", (void *)d->hdr.nr_body);
|
|
printf(" nr_mem_id: %"PRIu16"\n", d->reg.nr_mem_id);
|
|
printf(" nr_ringid: %"PRIu16"\n", d->reg.nr_ringid);
|
|
printf(" nr_mode: %lx\n", (unsigned long)d->reg.nr_mode);
|
|
printf(" nr_flags: %lx\n", (unsigned long)d->reg.nr_flags);
|
|
printf("\n");
|
|
if (d->hdr.nr_options) {
|
|
struct nmreq_opt_extmem *e = (struct nmreq_opt_extmem *)d->hdr.nr_options;
|
|
printf("opt_extmem (%p):\n", e);
|
|
printf(" nro_opt.nro_next: %lx\n", (unsigned long)e->nro_opt.nro_next);
|
|
printf(" nro_opt.nro_reqtype: %"PRIu32"\n", e->nro_opt.nro_reqtype);
|
|
printf(" nro_usrptr: %lx\n", (unsigned long)e->nro_usrptr);
|
|
printf(" nro_info.nr_memsize %"PRIu64"\n", e->nro_info.nr_memsize);
|
|
}
|
|
printf("\n");
|
|
printf("mem (%p):\n", d->mem);
|
|
printf(" refcount: %d\n", d->mem->refcount);
|
|
printf(" mem: %p\n", d->mem->mem);
|
|
printf(" size: %zu\n", d->mem->size);
|
|
printf("\n");
|
|
printf("rings:\n");
|
|
printf(" tx: [%d, %d]\n", d->first_tx_ring, d->last_tx_ring);
|
|
printf(" rx: [%d, %d]\n", d->first_rx_ring, d->last_rx_ring);
|
|
}
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
struct nmport_d *d;
|
|
|
|
if (argc < 2) {
|
|
fprintf(stderr, "usage: %s netmap-expr\n", argv[0]);
|
|
return 1;
|
|
}
|
|
|
|
d = nmport_open(argv[1]);
|
|
if (d != NULL) {
|
|
nmreq_dump(d);
|
|
nmport_close(d);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|