5cbf777cfd
This patch implements the feature described in rfc1812#section-5.3.5.2
and rfc2644. It allows the router to forward directed broadcast when
sysctl bc_forwarding is enabled.
Note that this feature could be done by iptables -j TEE, but it would
cause some problems:
- target TEE's gateway param has to be set with a specific address,
and it's not flexible especially when the route wants forward all
directed broadcasts.
- this duplicates the directed broadcasts so this may cause side
effects to applications.
Besides, to keep consistent with other os router like BSD, it's also
necessary to implement it in the route rx path.
Note that route cache needs to be flushed when bc_forwarding is
changed.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
31 lines
629 B
C
31 lines
629 B
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_LINUX_NETCONF_H_
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#define _UAPI_LINUX_NETCONF_H_
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#include <linux/types.h>
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#include <linux/netlink.h>
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struct netconfmsg {
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__u8 ncm_family;
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};
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enum {
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NETCONFA_UNSPEC,
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NETCONFA_IFINDEX,
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NETCONFA_FORWARDING,
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NETCONFA_RP_FILTER,
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NETCONFA_MC_FORWARDING,
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NETCONFA_PROXY_NEIGH,
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NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
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NETCONFA_INPUT,
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NETCONFA_BC_FORWARDING,
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__NETCONFA_MAX
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};
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#define NETCONFA_MAX (__NETCONFA_MAX - 1)
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#define NETCONFA_ALL -1
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#define NETCONFA_IFINDEX_ALL -1
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#define NETCONFA_IFINDEX_DEFAULT -2
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#endif /* _UAPI_LINUX_NETCONF_H_ */
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