mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 05:36:39 +07:00
e0bb8c44ed
When use gre vport, openvswitch register a gre_cisco_protocol but
does not supply a err_handler with it. The gre_cisco_err() in
net/ipv4/gre_demux.c expect err_handler be provided with the
gre_cisco_protocol implementation, and call ->err_handler() without
existence check, cause the kernel crash.
This patch provide a err_handler to fix this bug.
This bug introduced by commit aa310701e7
(openvswitch: Add gre
tunnel support.)
Signed-off-by: Wei Zhang <asuka.com@163.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
288 lines
6.6 KiB
C
288 lines
6.6 KiB
C
/*
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* Copyright (c) 2007-2013 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/if.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/if_tunnel.h>
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#include <linux/if_vlan.h>
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#include <linux/in.h>
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#include <linux/in_route.h>
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#include <linux/inetdevice.h>
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#include <linux/jhash.h>
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#include <linux/list.h>
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#include <linux/kernel.h>
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#include <linux/workqueue.h>
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#include <linux/rculist.h>
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#include <net/route.h>
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#include <net/xfrm.h>
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#include <net/icmp.h>
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#include <net/ip.h>
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#include <net/ip_tunnels.h>
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#include <net/gre.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <net/protocol.h>
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#include "datapath.h"
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#include "vport.h"
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/* Returns the least-significant 32 bits of a __be64. */
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static __be32 be64_get_low32(__be64 x)
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{
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#ifdef __BIG_ENDIAN
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return (__force __be32)x;
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#else
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return (__force __be32)((__force u64)x >> 32);
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#endif
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}
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static __be16 filter_tnl_flags(__be16 flags)
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{
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return flags & (TUNNEL_CSUM | TUNNEL_KEY);
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}
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static struct sk_buff *__build_header(struct sk_buff *skb,
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int tunnel_hlen)
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{
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const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
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struct tnl_ptk_info tpi;
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skb = gre_handle_offloads(skb, !!(tun_key->tun_flags & TUNNEL_CSUM));
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if (IS_ERR(skb))
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return NULL;
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tpi.flags = filter_tnl_flags(tun_key->tun_flags);
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tpi.proto = htons(ETH_P_TEB);
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tpi.key = be64_get_low32(tun_key->tun_id);
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tpi.seq = 0;
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gre_build_header(skb, &tpi, tunnel_hlen);
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return skb;
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}
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static __be64 key_to_tunnel_id(__be32 key, __be32 seq)
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{
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#ifdef __BIG_ENDIAN
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return (__force __be64)((__force u64)seq << 32 | (__force u32)key);
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#else
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return (__force __be64)((__force u64)key << 32 | (__force u32)seq);
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#endif
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}
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/* Called with rcu_read_lock and BH disabled. */
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static int gre_rcv(struct sk_buff *skb,
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const struct tnl_ptk_info *tpi)
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{
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struct ovs_key_ipv4_tunnel tun_key;
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struct ovs_net *ovs_net;
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struct vport *vport;
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__be64 key;
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ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
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vport = rcu_dereference(ovs_net->vport_net.gre_vport);
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if (unlikely(!vport))
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return PACKET_REJECT;
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key = key_to_tunnel_id(tpi->key, tpi->seq);
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ovs_flow_tun_key_init(&tun_key, ip_hdr(skb), key,
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filter_tnl_flags(tpi->flags));
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ovs_vport_receive(vport, skb, &tun_key);
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return PACKET_RCVD;
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}
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/* Called with rcu_read_lock and BH disabled. */
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static int gre_err(struct sk_buff *skb, u32 info,
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const struct tnl_ptk_info *tpi)
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{
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struct ovs_net *ovs_net;
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struct vport *vport;
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ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
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vport = rcu_dereference(ovs_net->vport_net.gre_vport);
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if (unlikely(!vport))
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return PACKET_REJECT;
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else
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return PACKET_RCVD;
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}
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static int gre_tnl_send(struct vport *vport, struct sk_buff *skb)
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{
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struct net *net = ovs_dp_get_net(vport->dp);
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struct flowi4 fl;
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struct rtable *rt;
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int min_headroom;
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int tunnel_hlen;
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__be16 df;
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int err;
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if (unlikely(!OVS_CB(skb)->tun_key)) {
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err = -EINVAL;
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goto error;
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}
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/* Route lookup */
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memset(&fl, 0, sizeof(fl));
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fl.daddr = OVS_CB(skb)->tun_key->ipv4_dst;
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fl.saddr = OVS_CB(skb)->tun_key->ipv4_src;
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fl.flowi4_tos = RT_TOS(OVS_CB(skb)->tun_key->ipv4_tos);
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fl.flowi4_mark = skb->mark;
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fl.flowi4_proto = IPPROTO_GRE;
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rt = ip_route_output_key(net, &fl);
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if (IS_ERR(rt))
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return PTR_ERR(rt);
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tunnel_hlen = ip_gre_calc_hlen(OVS_CB(skb)->tun_key->tun_flags);
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min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
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+ tunnel_hlen + sizeof(struct iphdr)
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+ (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
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if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) {
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int head_delta = SKB_DATA_ALIGN(min_headroom -
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skb_headroom(skb) +
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16);
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err = pskb_expand_head(skb, max_t(int, head_delta, 0),
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0, GFP_ATOMIC);
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if (unlikely(err))
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goto err_free_rt;
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}
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if (vlan_tx_tag_present(skb)) {
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if (unlikely(!__vlan_put_tag(skb,
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skb->vlan_proto,
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vlan_tx_tag_get(skb)))) {
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err = -ENOMEM;
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goto err_free_rt;
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}
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skb->vlan_tci = 0;
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}
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/* Push Tunnel header. */
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skb = __build_header(skb, tunnel_hlen);
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if (unlikely(!skb)) {
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err = 0;
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goto err_free_rt;
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}
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df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
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htons(IP_DF) : 0;
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skb->ignore_df = 1;
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return iptunnel_xmit(skb->sk, rt, skb, fl.saddr,
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OVS_CB(skb)->tun_key->ipv4_dst, IPPROTO_GRE,
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OVS_CB(skb)->tun_key->ipv4_tos,
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OVS_CB(skb)->tun_key->ipv4_ttl, df, false);
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err_free_rt:
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ip_rt_put(rt);
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error:
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return err;
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}
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static struct gre_cisco_protocol gre_protocol = {
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.handler = gre_rcv,
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.err_handler = gre_err,
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.priority = 1,
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};
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static int gre_ports;
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static int gre_init(void)
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{
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int err;
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gre_ports++;
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if (gre_ports > 1)
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return 0;
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err = gre_cisco_register(&gre_protocol);
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if (err)
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pr_warn("cannot register gre protocol handler\n");
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return err;
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}
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static void gre_exit(void)
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{
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gre_ports--;
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if (gre_ports > 0)
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return;
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gre_cisco_unregister(&gre_protocol);
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}
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static const char *gre_get_name(const struct vport *vport)
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{
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return vport_priv(vport);
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}
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static struct vport *gre_create(const struct vport_parms *parms)
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{
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struct net *net = ovs_dp_get_net(parms->dp);
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struct ovs_net *ovs_net;
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struct vport *vport;
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int err;
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err = gre_init();
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if (err)
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return ERR_PTR(err);
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ovs_net = net_generic(net, ovs_net_id);
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if (ovsl_dereference(ovs_net->vport_net.gre_vport)) {
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vport = ERR_PTR(-EEXIST);
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goto error;
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}
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vport = ovs_vport_alloc(IFNAMSIZ, &ovs_gre_vport_ops, parms);
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if (IS_ERR(vport))
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goto error;
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strncpy(vport_priv(vport), parms->name, IFNAMSIZ);
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rcu_assign_pointer(ovs_net->vport_net.gre_vport, vport);
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return vport;
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error:
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gre_exit();
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return vport;
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}
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static void gre_tnl_destroy(struct vport *vport)
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{
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struct net *net = ovs_dp_get_net(vport->dp);
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struct ovs_net *ovs_net;
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ovs_net = net_generic(net, ovs_net_id);
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RCU_INIT_POINTER(ovs_net->vport_net.gre_vport, NULL);
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ovs_vport_deferred_free(vport);
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gre_exit();
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}
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const struct vport_ops ovs_gre_vport_ops = {
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.type = OVS_VPORT_TYPE_GRE,
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.create = gre_create,
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.destroy = gre_tnl_destroy,
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.get_name = gre_get_name,
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.send = gre_tnl_send,
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};
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