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![Peter Huang (Peng)](/assets/img/avatar_default.png)
bridge: set fake_rtable's dst to NULL to avoid kernel Oops when bridge is deleted before tap/vif device's delete, kernel may encounter an oops because of NULL reference to fake_rtable's dst. Set fake_rtable's dst to NULL before sending packets out can solve this problem. v4 reformat, change br_drop_fake_rtable(skb) to {} v3 enrich commit header v2 introducing new flag DST_FAKE_RTABLE to dst_entry struct. [ Use "do { } while (0)" for nop br_drop_fake_rtable() implementation -DaveM ] Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Peter Huang <peter.huangpeng@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
122 lines
3.1 KiB
C
122 lines
3.1 KiB
C
#ifndef __LINUX_BRIDGE_NETFILTER_H
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#define __LINUX_BRIDGE_NETFILTER_H
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/* bridge-specific defines for netfilter.
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*/
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#include <linux/netfilter.h>
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#include <linux/if_ether.h>
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#include <linux/if_vlan.h>
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#include <linux/if_pppox.h>
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/* Bridge Hooks */
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/* After promisc drops, checksum checks. */
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#define NF_BR_PRE_ROUTING 0
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/* If the packet is destined for this box. */
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#define NF_BR_LOCAL_IN 1
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/* If the packet is destined for another interface. */
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#define NF_BR_FORWARD 2
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/* Packets coming from a local process. */
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#define NF_BR_LOCAL_OUT 3
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/* Packets about to hit the wire. */
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#define NF_BR_POST_ROUTING 4
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/* Not really a hook, but used for the ebtables broute table */
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#define NF_BR_BROUTING 5
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#define NF_BR_NUMHOOKS 6
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#ifdef __KERNEL__
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enum nf_br_hook_priorities {
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NF_BR_PRI_FIRST = INT_MIN,
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NF_BR_PRI_NAT_DST_BRIDGED = -300,
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NF_BR_PRI_FILTER_BRIDGED = -200,
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NF_BR_PRI_BRNF = 0,
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NF_BR_PRI_NAT_DST_OTHER = 100,
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NF_BR_PRI_FILTER_OTHER = 200,
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NF_BR_PRI_NAT_SRC = 300,
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NF_BR_PRI_LAST = INT_MAX,
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};
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#ifdef CONFIG_BRIDGE_NETFILTER
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#define BRNF_PKT_TYPE 0x01
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#define BRNF_BRIDGED_DNAT 0x02
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#define BRNF_BRIDGED 0x04
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#define BRNF_NF_BRIDGE_PREROUTING 0x08
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#define BRNF_8021Q 0x10
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#define BRNF_PPPoE 0x20
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/* Only used in br_forward.c */
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extern int nf_bridge_copy_header(struct sk_buff *skb);
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static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
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{
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if (skb->nf_bridge &&
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skb->nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT))
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return nf_bridge_copy_header(skb);
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return 0;
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}
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static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
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{
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switch (skb->protocol) {
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case __cpu_to_be16(ETH_P_8021Q):
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return VLAN_HLEN;
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case __cpu_to_be16(ETH_P_PPP_SES):
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return PPPOE_SES_HLEN;
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default:
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return 0;
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}
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}
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static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
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{
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if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE))
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return PPPOE_SES_HLEN;
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return 0;
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}
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extern int br_handle_frame_finish(struct sk_buff *skb);
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/* Only used in br_device.c */
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static inline int br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb)
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{
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struct nf_bridge_info *nf_bridge = skb->nf_bridge;
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skb_pull(skb, ETH_HLEN);
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nf_bridge->mask ^= BRNF_BRIDGED_DNAT;
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skb_copy_to_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN),
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skb->nf_bridge->data, ETH_HLEN-ETH_ALEN);
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skb->dev = nf_bridge->physindev;
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return br_handle_frame_finish(skb);
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}
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/* This is called by the IP fragmenting code and it ensures there is
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* enough room for the encapsulating header (if there is one). */
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static inline unsigned int nf_bridge_pad(const struct sk_buff *skb)
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{
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if (skb->nf_bridge)
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return nf_bridge_encap_header_len(skb);
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return 0;
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}
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struct bridge_skb_cb {
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union {
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__be32 ipv4;
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} daddr;
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};
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static inline void br_drop_fake_rtable(struct sk_buff *skb)
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{
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struct dst_entry *dst = skb_dst(skb);
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if (dst && (dst->flags & DST_FAKE_RTABLE))
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skb_dst_drop(skb);
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}
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#else
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#define nf_bridge_maybe_copy_header(skb) (0)
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#define nf_bridge_pad(skb) (0)
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#define br_drop_fake_rtable(skb) do { } while (0)
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#endif /* CONFIG_BRIDGE_NETFILTER */
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#endif /* __KERNEL__ */
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#endif
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