545 lines
14 KiB
C
545 lines
14 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/types.h>
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#include <sys/malloc.h>
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#include <sys/rmlock.h>
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#include <sys/socket.h>
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#include <machine/stdarg.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/route/nhop.h>
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#include <net/route/route_ctl.h>
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#include <netinet/in.h>
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#include <netlink/netlink.h>
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#include <netlink/netlink_ctl.h>
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#include <netlink/netlink_var.h>
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#include <netlink/netlink_route.h>
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#define DEBUG_MOD_NAME nl_parser
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#define DEBUG_MAX_LEVEL LOG_DEBUG3
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#include <netlink/netlink_debug.h>
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_DECLARE_DEBUG(LOG_DEBUG);
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bool
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nlmsg_report_err_msg(struct nl_pstate *npt, const char *fmt, ...)
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{
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va_list ap;
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if (npt->err_msg != NULL)
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return (false);
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char *buf = npt_alloc(npt, NL_MAX_ERROR_BUF);
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if (buf == NULL)
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return (false);
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va_start(ap, fmt);
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vsnprintf(buf, NL_MAX_ERROR_BUF, fmt, ap);
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va_end(ap);
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npt->err_msg = buf;
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return (true);
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}
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bool
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nlmsg_report_err_offset(struct nl_pstate *npt, uint32_t off)
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{
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if (npt->err_off != 0)
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return (false);
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npt->err_off = off;
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return (true);
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}
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void
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nlmsg_report_cookie(struct nl_pstate *npt, struct nlattr *nla)
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{
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MPASS(nla->nla_type == NLMSGERR_ATTR_COOKIE);
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MPASS(nla->nla_len >= sizeof(struct nlattr));
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npt->cookie = nla;
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}
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void
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nlmsg_report_cookie_u32(struct nl_pstate *npt, uint32_t val)
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{
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struct nlattr *nla = npt_alloc(npt, sizeof(*nla) + sizeof(uint32_t));
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nla->nla_type = NLMSGERR_ATTR_COOKIE;
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nla->nla_len = sizeof(*nla) + sizeof(uint32_t);
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memcpy(nla + 1, &val, sizeof(uint32_t));
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nlmsg_report_cookie(npt, nla);
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}
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static const struct nlattr_parser *
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search_states(const struct nlattr_parser *ps, int pslen, int key)
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{
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int left_i = 0, right_i = pslen - 1;
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if (key < ps[0].type || key > ps[pslen - 1].type)
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return (NULL);
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while (left_i + 1 < right_i) {
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int mid_i = (left_i + right_i) / 2;
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if (key < ps[mid_i].type)
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right_i = mid_i;
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else if (key > ps[mid_i].type)
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left_i = mid_i + 1;
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else
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return (&ps[mid_i]);
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}
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if (ps[left_i].type == key)
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return (&ps[left_i]);
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else if (ps[right_i].type == key)
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return (&ps[right_i]);
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return (NULL);
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}
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int
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nl_parse_attrs_raw(struct nlattr *nla_head, int len, const struct nlattr_parser *ps, int pslen,
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struct nl_pstate *npt, void *target)
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{
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struct nlattr *nla = NULL;
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int error = 0;
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NL_LOG(LOG_DEBUG3, "parse %p remaining_len %d", nla_head, len);
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int orig_len = len;
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NLA_FOREACH(nla, nla_head, len) {
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NL_LOG(LOG_DEBUG3, ">> parsing %p attr_type %d len %d (rem %d)", nla, nla->nla_type, nla->nla_len, len);
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if (nla->nla_len < sizeof(struct nlattr)) {
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NLMSG_REPORT_ERR_MSG(npt, "Invalid attr %p type %d len: %d",
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nla, nla->nla_type, nla->nla_len);
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uint32_t off = (char *)nla - (char *)npt->hdr;
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nlmsg_report_err_offset(npt, off);
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return (EINVAL);
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}
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int nla_type = nla->nla_type & NLA_TYPE_MASK;
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const struct nlattr_parser *s = search_states(ps, pslen, nla_type);
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if (s != NULL) {
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void *ptr = (void *)((char *)target + s->off);
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error = s->cb(nla, npt, s->arg, ptr);
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if (error != 0) {
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uint32_t off = (char *)nla - (char *)npt->hdr;
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nlmsg_report_err_offset(npt, off);
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NL_LOG(LOG_DEBUG3, "parse failed att offset %u", off);
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return (error);
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}
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} else {
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/* Ignore non-specified attributes */
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NL_LOG(LOG_DEBUG3, "ignoring attr %d", nla->nla_type);
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}
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}
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if (len >= sizeof(struct nlattr)) {
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nla = (struct nlattr *)((char *)nla_head + (orig_len - len));
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NL_LOG(LOG_DEBUG3, " >>> end %p attr_type %d len %d", nla,
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nla->nla_type, nla->nla_len);
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}
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NL_LOG(LOG_DEBUG3, "end parse: %p remaining_len %d", nla, len);
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return (0);
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}
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void
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nl_get_attrs_bmask_raw(struct nlattr *nla_head, int len, struct nlattr_bmask *bm)
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{
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struct nlattr *nla = NULL;
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BIT_ZERO(NL_ATTR_BMASK_SIZE, bm);
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NLA_FOREACH(nla, nla_head, len) {
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if (nla->nla_len < sizeof(struct nlattr))
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return;
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int nla_type = nla->nla_type & NLA_TYPE_MASK;
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if (nla_type < NL_ATTR_BMASK_SIZE)
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BIT_SET(NL_ATTR_BMASK_SIZE, nla_type, bm);
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else
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NL_LOG(LOG_DEBUG2, "Skipping type %d in the mask: too short",
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nla_type);
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}
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}
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bool
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nl_has_attr(const struct nlattr_bmask *bm, unsigned int nla_type)
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{
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MPASS(nla_type < NL_ATTR_BMASK_SIZE);
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return (BIT_ISSET(NL_ATTR_BMASK_SIZE, nla_type, bm));
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}
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int
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nlattr_get_flag(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
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{
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if (__predict_false(NLA_DATA_LEN(nla) != 0)) {
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NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not a flag",
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nla->nla_type, NLA_DATA_LEN(nla));
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return (EINVAL);
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}
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*((uint8_t *)target) = 1;
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return (0);
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}
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static struct sockaddr *
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parse_rta_ip4(void *rta_data, struct nl_pstate *npt, int *perror)
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{
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struct sockaddr_in *sin;
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sin = (struct sockaddr_in *)npt_alloc_sockaddr(npt, sizeof(struct sockaddr_in));
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if (__predict_false(sin == NULL)) {
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*perror = ENOBUFS;
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return (NULL);
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}
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sin->sin_len = sizeof(struct sockaddr_in);
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sin->sin_family = AF_INET;
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memcpy(&sin->sin_addr, rta_data, sizeof(struct in_addr));
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return ((struct sockaddr *)sin);
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}
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static struct sockaddr *
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parse_rta_ip6(void *rta_data, struct nl_pstate *npt, int *perror)
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{
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struct sockaddr_in6 *sin6;
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sin6 = (struct sockaddr_in6 *)npt_alloc_sockaddr(npt, sizeof(struct sockaddr_in6));
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if (__predict_false(sin6 == NULL)) {
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*perror = ENOBUFS;
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return (NULL);
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}
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sin6->sin6_len = sizeof(struct sockaddr_in6);
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sin6->sin6_family = AF_INET6;
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memcpy(&sin6->sin6_addr, rta_data, sizeof(struct in6_addr));
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return ((struct sockaddr *)sin6);
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}
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static struct sockaddr *
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parse_rta_ip(struct rtattr *rta, struct nl_pstate *npt, int *perror)
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{
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void *rta_data = NL_RTA_DATA(rta);
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int rta_len = NL_RTA_DATA_LEN(rta);
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if (rta_len == sizeof(struct in_addr)) {
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return (parse_rta_ip4(rta_data, npt, perror));
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} else if (rta_len == sizeof(struct in6_addr)) {
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return (parse_rta_ip6(rta_data, npt, perror));
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} else {
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NLMSG_REPORT_ERR_MSG(npt, "unknown IP len: %d for rta type %d",
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rta_len, rta->rta_type);
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*perror = ENOTSUP;
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return (NULL);
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}
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return (NULL);
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}
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int
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nlattr_get_ip(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
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{
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int error = 0;
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struct sockaddr *sa = parse_rta_ip((struct rtattr *)nla, npt, &error);
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*((struct sockaddr **)target) = sa;
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return (error);
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}
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static struct sockaddr *
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parse_rta_via(struct rtattr *rta, struct nl_pstate *npt, int *perror)
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{
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struct rtvia *via = NL_RTA_DATA(rta);
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int data_len = NL_RTA_DATA_LEN(rta);
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if (__predict_false(data_len) < sizeof(struct rtvia)) {
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NLMSG_REPORT_ERR_MSG(npt, "undersized RTA_VIA(%d) attr: len %d",
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rta->rta_type, data_len);
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*perror = EINVAL;
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return (NULL);
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}
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data_len -= offsetof(struct rtvia, rtvia_addr);
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switch (via->rtvia_family) {
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case AF_INET:
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if (__predict_false(data_len < sizeof(struct in_addr))) {
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*perror = EINVAL;
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return (NULL);
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}
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return (parse_rta_ip4(via->rtvia_addr, npt, perror));
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case AF_INET6:
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if (__predict_false(data_len < sizeof(struct in6_addr))) {
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*perror = EINVAL;
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return (NULL);
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}
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return (parse_rta_ip6(via->rtvia_addr, npt, perror));
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default:
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*perror = ENOTSUP;
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return (NULL);
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}
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}
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int
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nlattr_get_ipvia(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
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{
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int error = 0;
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struct sockaddr *sa = parse_rta_via((struct rtattr *)nla, npt, &error);
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*((struct sockaddr **)target) = sa;
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return (error);
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}
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int
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nlattr_get_uint8(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
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{
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if (__predict_false(NLA_DATA_LEN(nla) != sizeof(uint8_t))) {
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NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not uint8",
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nla->nla_type, NLA_DATA_LEN(nla));
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return (EINVAL);
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}
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*((uint16_t *)target) = *((const uint16_t *)NL_RTA_DATA_CONST(nla));
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return (0);
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}
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int
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nlattr_get_uint16(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
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{
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if (__predict_false(NLA_DATA_LEN(nla) != sizeof(uint16_t))) {
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NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not uint16",
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nla->nla_type, NLA_DATA_LEN(nla));
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return (EINVAL);
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}
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*((uint16_t *)target) = *((const uint16_t *)NL_RTA_DATA_CONST(nla));
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return (0);
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}
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int
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nlattr_get_uint32(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
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{
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if (__predict_false(NLA_DATA_LEN(nla) != sizeof(uint32_t))) {
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NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not uint32",
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nla->nla_type, NLA_DATA_LEN(nla));
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return (EINVAL);
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}
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*((uint32_t *)target) = *((const uint32_t *)NL_RTA_DATA_CONST(nla));
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return (0);
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}
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int
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nlattr_get_uint64(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
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{
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if (__predict_false(NLA_DATA_LEN(nla) != sizeof(uint64_t))) {
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NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not uint64",
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nla->nla_type, NLA_DATA_LEN(nla));
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return (EINVAL);
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}
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memcpy(target, NL_RTA_DATA_CONST(nla), sizeof(uint64_t));
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return (0);
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}
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int
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nlattr_get_in_addr(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
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{
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if (__predict_false(NLA_DATA_LEN(nla) != sizeof(in_addr_t))) {
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NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not in_addr_t",
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nla->nla_type, NLA_DATA_LEN(nla));
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return (EINVAL);
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}
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memcpy(target, NLA_DATA_CONST(nla), sizeof(in_addr_t));
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return (0);
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}
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int
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nlattr_get_in6_addr(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
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{
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if (__predict_false(NLA_DATA_LEN(nla) != sizeof(struct in6_addr))) {
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NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not struct in6_addr",
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nla->nla_type, NLA_DATA_LEN(nla));
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return (EINVAL);
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}
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memcpy(target, NLA_DATA_CONST(nla), sizeof(struct in6_addr));
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return (0);
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}
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static int
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nlattr_get_ifp_internal(struct nlattr *nla, struct nl_pstate *npt,
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void *target, bool zero_ok)
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{
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if (__predict_false(NLA_DATA_LEN(nla) != sizeof(uint32_t))) {
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NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not uint32",
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nla->nla_type, NLA_DATA_LEN(nla));
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return (EINVAL);
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}
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uint32_t ifindex = *((const uint32_t *)NLA_DATA_CONST(nla));
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if (ifindex == 0 && zero_ok) {
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*((struct ifnet **)target) = NULL;
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return (0);
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}
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NET_EPOCH_ASSERT();
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struct ifnet *ifp = ifnet_byindex(ifindex);
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if (__predict_false(ifp == NULL)) {
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NLMSG_REPORT_ERR_MSG(npt, "nla type %d: ifindex %u invalid",
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nla->nla_type, ifindex);
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return (ENOENT);
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}
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*((struct ifnet **)target) = ifp;
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NL_LOG(LOG_DEBUG3, "nla type %d: ifindex %u -> %s", nla->nla_type,
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ifindex, if_name(ifp));
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return (0);
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}
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int
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nlattr_get_ifp(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
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{
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return (nlattr_get_ifp_internal(nla, npt, target, false));
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}
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int
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nlattr_get_ifpz(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
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{
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return (nlattr_get_ifp_internal(nla, npt, target, true));
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}
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int
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nlattr_get_string(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
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{
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int maxlen = NLA_DATA_LEN(nla);
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if (__predict_false(strnlen((char *)NLA_DATA(nla), maxlen) >= maxlen)) {
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NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not NULL-terminated",
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nla->nla_type, maxlen);
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return (EINVAL);
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}
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*((char **)target) = (char *)NLA_DATA(nla);
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return (0);
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}
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int
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nlattr_get_stringn(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
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{
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int maxlen = NLA_DATA_LEN(nla);
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char *buf = npt_alloc(npt, maxlen + 1);
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if (buf == NULL)
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return (ENOMEM);
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buf[maxlen] = '\0';
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memcpy(buf, NLA_DATA(nla), maxlen);
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*((char **)target) = buf;
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return (0);
|
|
}
|
|
int
|
|
nlattr_get_nla(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
|
|
{
|
|
NL_LOG(LOG_DEBUG3, "STORING %p len %d", nla, nla->nla_len);
|
|
*((struct nlattr **)target) = nla;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
nlattr_get_nested(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
|
|
{
|
|
const struct nlhdr_parser *p = (const struct nlhdr_parser *)arg;
|
|
int error;
|
|
|
|
/* Assumes target points to the beginning of the structure */
|
|
error = nl_parse_header(NLA_DATA(nla), NLA_DATA_LEN(nla), p, npt, target);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
nlf_get_ifp(void *src, struct nl_pstate *npt, void *target)
|
|
{
|
|
int ifindex = *((const int *)src);
|
|
|
|
NET_EPOCH_ASSERT();
|
|
|
|
struct ifnet *ifp = ifnet_byindex(ifindex);
|
|
if (ifp == NULL) {
|
|
NL_LOG(LOG_DEBUG, "ifindex %u invalid", ifindex);
|
|
return (ENOENT);
|
|
}
|
|
*((struct ifnet **)target) = ifp;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
nlf_get_ifpz(void *src, struct nl_pstate *npt, void *target)
|
|
{
|
|
int ifindex = *((const int *)src);
|
|
|
|
NET_EPOCH_ASSERT();
|
|
|
|
struct ifnet *ifp = ifnet_byindex(ifindex);
|
|
if (ifindex != 0 && ifp == NULL) {
|
|
NL_LOG(LOG_DEBUG, "ifindex %u invalid", ifindex);
|
|
return (ENOENT);
|
|
}
|
|
*((struct ifnet **)target) = ifp;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
nlf_get_u8(void *src, struct nl_pstate *npt, void *target)
|
|
{
|
|
uint8_t val = *((const uint8_t *)src);
|
|
|
|
*((uint8_t *)target) = val;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
nlf_get_u8_u32(void *src, struct nl_pstate *npt, void *target)
|
|
{
|
|
*((uint32_t *)target) = *((const uint8_t *)src);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
nlf_get_u16(void *src, struct nl_pstate *npt, void *target)
|
|
{
|
|
*((uint16_t *)target) = *((const uint16_t *)src);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
nlf_get_u32(void *src, struct nl_pstate *npt, void *target)
|
|
{
|
|
*((uint32_t *)target) = *((const uint32_t *)src);
|
|
return (0);
|
|
}
|
|
|