mirror of https://gerrit.osmocom.org/libosmocore
601 lines
15 KiB
C
601 lines
15 KiB
C
/*! \file gprs_ns2_frgre.c
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* NS-over-FR-over-GRE implementation.
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* GPRS Networks Service (NS) messages on the Gb interface.
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* 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05)
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* as well as its successor 3GPP TS 48.016 */
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/* (C) 2009-2010,2014,2017 by Harald Welte <laforge@gnumonks.org>
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* (C) 2020 sysmocom - s.f.m.c. GmbH
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* Author: Alexander Couzens <lynxis@fe80.eu>
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*
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* All Rights Reserved
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#include <arpa/inet.h>
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#include <osmocom/core/byteswap.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/gprs/gprs_ns2.h>
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#include "gprs_ns2_internal.h"
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#define GRE_PTYPE_FR 0x6559
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#define GRE_PTYPE_IPv4 0x0800
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#define GRE_PTYPE_IPv6 0x86dd
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#define GRE_PTYPE_KAR 0x0000 /* keepalive response */
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#ifndef IPPROTO_GRE
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# define IPPROTO_GRE 47
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#endif
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struct gre_hdr {
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uint16_t flags;
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uint16_t ptype;
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} __attribute__ ((packed));
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#if defined(__FreeBSD__) || defined(__APPLE__) || defined(__CYGWIN__)
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/**
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* On BSD the IPv4 struct is called struct ip and instead of iXX
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* the members are called ip_XX. One could change this code to use
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* struct ip but that would require to define _BSD_SOURCE and that
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* might have other complications. Instead make sure struct iphdr
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* is present on FreeBSD. The below is taken from GLIBC.
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*
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* The GNU C Library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*/
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struct iphdr
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{
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#if BYTE_ORDER == LITTLE_ENDIAN
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unsigned int ihl:4;
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unsigned int version:4;
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#elif BYTE_ORDER == BIG_ENDIAN
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unsigned int version:4;
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unsigned int ihl:4;
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#endif
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u_int8_t tos;
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u_int16_t tot_len;
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u_int16_t id;
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u_int16_t frag_off;
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u_int8_t ttl;
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u_int8_t protocol;
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u_int16_t check;
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u_int32_t saddr;
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u_int32_t daddr;
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/*The options start here. */
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};
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#endif
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static void free_bind(struct gprs_ns2_vc_bind *bind);
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static inline int frgre_sendmsg(struct gprs_ns2_vc_bind *bind,
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struct msgb *msg,
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struct osmo_sockaddr *dest);
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struct gprs_ns2_vc_driver vc_driver_frgre = {
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.name = "GB frame relay over GRE",
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.free_bind = free_bind,
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};
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struct priv_bind {
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struct osmo_fd fd;
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struct osmo_sockaddr addr;
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uint16_t dlci;
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int dscp;
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};
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struct priv_vc {
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struct osmo_sockaddr remote;
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uint16_t dlci;
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};
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static void free_vc(struct gprs_ns2_vc *nsvc)
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{
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OSMO_ASSERT(nsvc);
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if (!nsvc->priv)
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return;
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talloc_free(nsvc->priv);
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nsvc->priv = NULL;
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}
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/*! clean up all private driver state. Should be only called by gprs_ns2_free_bind() */
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static void free_bind(struct gprs_ns2_vc_bind *bind)
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{
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struct priv_bind *priv;
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if (!bind)
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return;
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priv = bind->priv;
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OSMO_ASSERT(llist_empty(&bind->nsvc));
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osmo_fd_close(&priv->fd);
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talloc_free(priv);
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}
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static struct priv_vc *frgre_alloc_vc(struct gprs_ns2_vc_bind *bind,
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struct gprs_ns2_vc *nsvc,
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struct osmo_sockaddr *remote,
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uint16_t dlci)
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{
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struct priv_vc *priv = talloc_zero(bind, struct priv_vc);
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if (!priv)
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return NULL;
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nsvc->priv = priv;
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priv->remote = *remote;
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priv->dlci = dlci;
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return priv;
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}
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static int handle_rx_gre_ipv6(struct osmo_fd *bfd, struct msgb *msg,
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struct ip6_hdr *ip6hdr, struct gre_hdr *greh)
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{
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/* RFC 7676 IPv6 Support for Generic Routing Encapsulation (GRE) */
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struct gprs_ns2_vc_bind *bind = bfd->data;
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struct priv_bind *priv = bind->priv;
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int gre_payload_len;
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struct ip6_hdr *inner_ip6h;
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struct gre_hdr *inner_greh;
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struct sockaddr_in6 daddr;
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struct in6_addr ia6;
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gre_payload_len = msg->len - (sizeof(*ip6hdr) + sizeof(*greh));
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inner_ip6h = (struct ip6_hdr *) ((uint8_t *)greh + sizeof(*greh));
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if (gre_payload_len < sizeof(*ip6hdr) + sizeof(*inner_greh)) {
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LOGP(DLNS, LOGL_ERROR, "GRE keepalive too short\n");
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return -EIO;
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}
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if (!memcmp(&inner_ip6h->ip6_src, &ip6hdr->ip6_src, sizeof(struct in6_addr)) ||
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!memcmp(&inner_ip6h->ip6_dst, &ip6hdr->ip6_dst, sizeof(struct in6_addr))) {
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LOGP(DLNS, LOGL_ERROR,
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"GRE keepalive with wrong tunnel addresses\n");
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return -EIO;
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}
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/* Are IPv6 extensions header are allowed in the *inner*? In the outer they are */
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if (inner_ip6h->ip6_ctlun.ip6_un1.ip6_un1_nxt != IPPROTO_GRE) {
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LOGP(DLNS, LOGL_ERROR, "GRE keepalive with wrong protocol\n");
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return -EIO;
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}
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inner_greh = (struct gre_hdr *) ((uint8_t *)inner_ip6h + sizeof(struct ip6_hdr));
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if (inner_greh->ptype != osmo_htons(GRE_PTYPE_KAR)) {
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LOGP(DLNS, LOGL_ERROR, "GRE keepalive inner GRE type != 0\n");
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return -EIO;
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}
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/* Actually send the response back */
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daddr.sin6_family = AF_INET6;
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daddr.sin6_addr = inner_ip6h->ip6_dst;
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daddr.sin6_port = IPPROTO_GRE;
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ia6 = ip6hdr->ip6_src;
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char ip6str[INET6_ADDRSTRLEN] = {};
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inet_ntop(AF_INET6, &ia6, ip6str, INET6_ADDRSTRLEN);
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LOGP(DLNS, LOGL_DEBUG, "GRE keepalive from %s, responding\n", ip6str);
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/* why does it reduce the gre_payload_len by the ipv6 header?
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* make it similiar to ipv4 even this seems to be wrong */
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return sendto(priv->fd.fd, inner_greh,
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gre_payload_len - sizeof(*inner_ip6h), 0,
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(struct sockaddr *)&daddr, sizeof(daddr));
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}
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/* IPv4 messages inside the GRE tunnel might be GRE keepalives */
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static int handle_rx_gre_ipv4(struct osmo_fd *bfd, struct msgb *msg,
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struct iphdr *iph, struct gre_hdr *greh)
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{
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struct gprs_ns2_vc_bind *bind = bfd->data;
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struct priv_bind *priv = bind->priv;
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int gre_payload_len;
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struct iphdr *inner_iph;
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struct gre_hdr *inner_greh;
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struct sockaddr_in daddr;
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struct in_addr ia;
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gre_payload_len = msg->len - (iph->ihl*4 + sizeof(*greh));
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inner_iph = (struct iphdr *) ((uint8_t *)greh + sizeof(*greh));
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if (gre_payload_len < inner_iph->ihl*4 + sizeof(*inner_greh)) {
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LOGP(DLNS, LOGL_ERROR, "GRE keepalive too short\n");
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return -EIO;
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}
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if (inner_iph->saddr != iph->daddr ||
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inner_iph->daddr != iph->saddr) {
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LOGP(DLNS, LOGL_ERROR,
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"GRE keepalive with wrong tunnel addresses\n");
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return -EIO;
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}
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if (inner_iph->protocol != IPPROTO_GRE) {
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LOGP(DLNS, LOGL_ERROR, "GRE keepalive with wrong protocol\n");
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return -EIO;
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}
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inner_greh = (struct gre_hdr *) ((uint8_t *)inner_iph + iph->ihl*4);
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if (inner_greh->ptype != osmo_htons(GRE_PTYPE_KAR)) {
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LOGP(DLNS, LOGL_ERROR, "GRE keepalive inner GRE type != 0\n");
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return -EIO;
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}
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/* Actually send the response back */
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daddr.sin_family = AF_INET;
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daddr.sin_addr.s_addr = inner_iph->daddr;
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daddr.sin_port = IPPROTO_GRE;
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ia.s_addr = iph->saddr;
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LOGP(DLNS, LOGL_DEBUG, "GRE keepalive from %s, responding\n",
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inet_ntoa(ia));
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/* why does it reduce the gre_payload_len by the ipv4 header? */
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return sendto(priv->fd.fd, inner_greh,
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gre_payload_len - inner_iph->ihl*4, 0,
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(struct sockaddr *)&daddr, sizeof(daddr));
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}
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static struct msgb *read_nsfrgre_msg(struct osmo_fd *bfd, int *error,
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struct osmo_sockaddr *saddr, uint16_t *dlci)
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{
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struct msgb *msg = msgb_alloc(NS_ALLOC_SIZE, "Gb/NS/FR/GRE Rx");
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int ret = 0;
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socklen_t saddr_len = sizeof(*saddr);
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struct iphdr *iph = NULL;
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struct ip6_hdr *ip6h = NULL;
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size_t ip46hdr;
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struct gre_hdr *greh;
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uint8_t *frh;
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if (!msg) {
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*error = -ENOMEM;
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return NULL;
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}
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ret = recvfrom(bfd->fd, msg->data, NS_ALLOC_SIZE, 0,
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&saddr->u.sa, &saddr_len);
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if (ret < 0) {
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LOGP(DLNS, LOGL_ERROR, "recv error %s during NS-FR-GRE recv\n",
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strerror(errno));
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*error = ret;
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goto out_err;
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} else if (ret == 0) {
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*error = ret;
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goto out_err;
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}
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msgb_put(msg, ret);
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/* we've received a raw packet including the IPv4 or IPv6 header */
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switch (saddr->u.sa.sa_family) {
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case AF_INET:
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ip46hdr = sizeof(struct iphdr);
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break;
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case AF_INET6:
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ip46hdr = sizeof(struct ip6_hdr);
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default:
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*error = -EIO;
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goto out_err;
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break;
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}
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/* TODO: add support for the extension headers */
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if (msg->len < ip46hdr + sizeof(*greh) + 2) {
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LOGP(DLNS, LOGL_ERROR, "Short IP packet: %u bytes\n", msg->len);
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*error = -EIO;
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goto out_err;
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}
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switch (saddr->u.sa.sa_family) {
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case AF_INET:
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iph = (struct iphdr *) msg->data;
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if (msg->len < (iph->ihl*4 + sizeof(*greh) + 2)) {
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LOGP(DLNS, LOGL_ERROR, "Short IP packet: %u bytes\n", msg->len);
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*error = -EIO;
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goto out_err;
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}
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break;
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case AF_INET6:
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ip6h = (struct ip6_hdr *) msg->data;
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break;
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}
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greh = (struct gre_hdr *) (msg->data + iph->ihl*4);
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if (greh->flags) {
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LOGP(DLNS, LOGL_NOTICE, "Unknown GRE flags 0x%04x\n",
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osmo_ntohs(greh->flags));
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}
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switch (osmo_ntohs(greh->ptype)) {
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case GRE_PTYPE_IPv4:
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/* IPv4 messages might be GRE keepalives */
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*error = handle_rx_gre_ipv4(bfd, msg, iph, greh);
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goto out_err;
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break;
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case GRE_PTYPE_IPv6:
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*error = handle_rx_gre_ipv6(bfd, msg, ip6h, greh);
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goto out_err;
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break;
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case GRE_PTYPE_FR:
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/* continue as usual */
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break;
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default:
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LOGP(DLNS, LOGL_NOTICE, "Unknown GRE protocol 0x%04x != FR\n",
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osmo_ntohs(greh->ptype));
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*error = -EIO;
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goto out_err;
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break;
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}
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if (msg->len < sizeof(*greh) + 2) {
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LOGP(DLNS, LOGL_ERROR, "Short FR header: %u bytes\n", msg->len);
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*error = -EIO;
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goto out_err;
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}
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frh = (uint8_t *)greh + sizeof(*greh);
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if (frh[0] & 0x01) {
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LOGP(DLNS, LOGL_NOTICE, "Unsupported single-byte FR address\n");
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*error = -EIO;
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goto out_err;
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}
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*dlci = ((frh[0] & 0xfc) << 2);
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if ((frh[1] & 0x0f) != 0x01) {
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LOGP(DLNS, LOGL_NOTICE, "Unknown second FR octet 0x%02x\n",
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frh[1]);
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*error = -EIO;
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goto out_err;
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}
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*dlci |= (frh[1] >> 4);
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msg->l2h = frh+2;
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return msg;
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out_err:
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msgb_free(msg);
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return NULL;
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}
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static int gprs_ns2_find_vc_by_dlci(struct gprs_ns2_vc_bind *bind,
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uint16_t dlci,
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struct gprs_ns2_vc **result)
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{
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struct gprs_ns2_vc *nsvc;
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struct priv_vc *vcpriv;
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if (!result)
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return -EINVAL;
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llist_for_each_entry(nsvc, &bind->nsvc, blist) {
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vcpriv = nsvc->priv;
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if (vcpriv->dlci != dlci) {
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*result = nsvc;
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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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static int handle_nsfrgre_read(struct osmo_fd *bfd)
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{
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int rc;
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struct osmo_sockaddr saddr;
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struct gprs_ns2_vc *nsvc;
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struct gprs_ns2_vc_bind *bind = bfd->data;
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struct msgb *msg;
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struct msgb *reject;
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uint16_t dlci;
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msg = read_nsfrgre_msg(bfd, &rc, &saddr, &dlci);
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if (!msg)
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return rc;
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if (dlci == 0 || dlci == 1023) {
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LOGP(DLNS, LOGL_INFO, "Received FR on LMI DLCI %u - ignoring\n",
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dlci);
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rc = 0;
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goto out;
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}
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rc = gprs_ns2_find_vc_by_dlci(bind, dlci, &nsvc);
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if (rc) {
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/* VC not found */
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rc = ns2_create_vc(bind, msg, "newconnection", &reject, &nsvc);
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switch (rc) {
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case GPRS_NS2_CS_FOUND:
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break;
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case GPRS_NS2_CS_ERROR:
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case GPRS_NS2_CS_SKIPPED:
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rc = 0;
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goto out;
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case GPRS_NS2_CS_REJECTED:
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/* nsip_sendmsg will free reject */
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rc = frgre_sendmsg(bind, reject, &saddr);
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goto out;
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case GPRS_NS2_CS_CREATED:
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frgre_alloc_vc(bind, nsvc, &saddr, dlci);
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gprs_ns2_vc_fsm_start(nsvc);
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break;
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}
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}
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rc = ns2_recv_vc(nsvc, msg);
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out:
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msgb_free(msg);
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return rc;
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}
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static int handle_nsfrgre_write(struct osmo_fd *bfd)
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{
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/* FIXME: actually send the data here instead of nsip_sendmsg() */
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return -EIO;
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}
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static inline int frgre_sendmsg(struct gprs_ns2_vc_bind *bind,
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struct msgb *msg,
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struct osmo_sockaddr *dest)
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{
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int rc;
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struct priv_bind *priv = bind->priv;
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rc = sendto(priv->fd.fd, msg->data, msg->len, 0,
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&dest->u.sa, sizeof(*dest));
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msgb_free(msg);
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return rc;
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}
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static int frgre_vc_sendmsg(struct gprs_ns2_vc *nsvc, struct msgb *msg)
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{
|
|
struct gprs_ns2_vc_bind *bind = nsvc->bind;
|
|
struct priv_vc *vcpriv = nsvc->priv;
|
|
struct priv_bind *bindpriv = bind->priv;
|
|
|
|
uint16_t dlci = osmo_htons(bindpriv->dlci);
|
|
uint8_t *frh;
|
|
struct gre_hdr *greh;
|
|
|
|
/* Prepend the FR header */
|
|
frh = msgb_push(msg, 2);
|
|
frh[0] = (dlci >> 2) & 0xfc;
|
|
frh[1] = ((dlci & 0xf)<<4) | 0x01;
|
|
|
|
/* Prepend the GRE header */
|
|
greh = (struct gre_hdr *) msgb_push(msg, sizeof(*greh));
|
|
greh->flags = 0;
|
|
greh->ptype = osmo_htons(GRE_PTYPE_FR);
|
|
|
|
return frgre_sendmsg(bind, msg, &vcpriv->remote);
|
|
}
|
|
|
|
static int frgre_fd_cb(struct osmo_fd *bfd, unsigned int what)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (what & OSMO_FD_READ)
|
|
rc = handle_nsfrgre_read(bfd);
|
|
if (what & OSMO_FD_WRITE)
|
|
rc = handle_nsfrgre_write(bfd);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*! determine if given bind is for FR-GRE encapsulation. */
|
|
int gprs_ns2_is_frgre_bind(struct gprs_ns2_vc_bind *bind)
|
|
{
|
|
return (bind->driver == &vc_driver_frgre);
|
|
}
|
|
|
|
/*! Create a new bind for NS over FR-GRE.
|
|
* \param[in] nsi NS instance in which to create the bind
|
|
* \param[in] local local address on which to bind
|
|
* \param[in] dscp DSCP/TOS bits to use for transmitted data on this bind
|
|
* \param[out] result pointer to created bind
|
|
* \return 0 on success; negative on error */
|
|
int gprs_ns2_frgre_bind(struct gprs_ns2_inst *nsi,
|
|
const struct osmo_sockaddr *local,
|
|
int dscp,
|
|
struct gprs_ns2_vc_bind **result)
|
|
{
|
|
struct gprs_ns2_vc_bind *bind = talloc_zero(nsi, struct gprs_ns2_vc_bind);
|
|
struct priv_bind *priv;
|
|
int rc;
|
|
|
|
if (!bind)
|
|
return -ENOSPC;
|
|
|
|
if (local->u.sa.sa_family != AF_INET && local->u.sa.sa_family != AF_INET6) {
|
|
talloc_free(bind);
|
|
return -EINVAL;
|
|
}
|
|
|
|
bind->driver = &vc_driver_frgre;
|
|
bind->send_vc = frgre_vc_sendmsg;
|
|
bind->free_vc = free_vc;
|
|
bind->nsi = nsi;
|
|
|
|
priv = bind->priv = talloc_zero(bind, struct priv_bind);
|
|
if (!priv) {
|
|
talloc_free(bind);
|
|
return -ENOSPC;
|
|
}
|
|
priv->fd.cb = frgre_fd_cb;
|
|
priv->fd.data = bind;
|
|
priv->addr = *local;
|
|
INIT_LLIST_HEAD(&bind->nsvc);
|
|
|
|
llist_add(&bind->list, &nsi->binding);
|
|
|
|
rc = osmo_sock_init_osa_ofd(&priv->fd, SOCK_RAW, IPPROTO_GRE,
|
|
local, NULL,
|
|
OSMO_SOCK_F_BIND);
|
|
if (rc < 0) {
|
|
talloc_free(priv);
|
|
talloc_free(bind);
|
|
return rc;
|
|
}
|
|
|
|
if (dscp > 0) {
|
|
priv->dscp = dscp;
|
|
|
|
rc = setsockopt(priv->fd.fd, IPPROTO_IP, IP_TOS,
|
|
&dscp, sizeof(dscp));
|
|
if (rc < 0)
|
|
LOGP(DLNS, LOGL_ERROR,
|
|
"Failed to set the DSCP to %d with ret(%d) errno(%d)\n",
|
|
dscp, rc, errno);
|
|
}
|
|
|
|
ns2_vty_bind_apply(bind);
|
|
|
|
if (result)
|
|
*result = bind;
|
|
|
|
return rc;
|
|
}
|