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devlink: Add layer 3 generic packet traps

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Add packet traps that can report packets that were dropped during layer
3 forwarding.

Signed-off-by: Amit Cohen <amitc@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amit Cohen 2019-11-07 18:42:09 +02:00 committed by David S. Miller
parent c55b810abb
commit 6896cc4d8f
3 changed files with 77 additions and 0 deletions
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41
Documentation/networking/devlink-trap.rst
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@ -162,6 +162,47 @@ be added to the following table:
- ``drop``
- Traps packets that the device decided to drop because they could not be
enqueued to a transmission queue which is full
* - ``non_ip``
- ``drop``
- Traps packets that the device decided to drop because they need to
undergo a layer 3 lookup, but are not IP or MPLS packets
* - ``uc_dip_over_mc_dmac``
- ``drop``
- Traps packets that the device decided to drop because they need to be
routed and they have a unicast destination IP and a multicast destination
MAC
* - ``dip_is_loopback_address``
- ``drop``
- Traps packets that the device decided to drop because they need to be
routed and their destination IP is the loopback address (i.e., 127.0.0.0/8
and ::1/128)
* - ``sip_is_mc``
- ``drop``
- Traps packets that the device decided to drop because they need to be
routed and their source IP is multicast (i.e., 224.0.0.0/8 and ff::/8)
* - ``sip_is_loopback_address``
- ``drop``
- Traps packets that the device decided to drop because they need to be
routed and their source IP is the loopback address (i.e., 127.0.0.0/8 and ::1/128)
* - ``ip_header_corrupted``
- ``drop``
- Traps packets that the device decided to drop because they need to be
routed and their IP header is corrupted: wrong checksum, wrong IP version
or too short Internet Header Length (IHL)
* - ``ipv4_sip_is_limited_bc``
- ``drop``
- Traps packets that the device decided to drop because they need to be
routed and their source IP is limited broadcast (i.e., 255.255.255.255/32)
* - ``ipv6_mc_dip_reserved_scope``
- ``drop``
- Traps IPv6 packets that the device decided to drop because they need to
be routed and their IPv6 multicast destination IP has a reserved scope
(i.e., ffx0::/16)
* - ``ipv6_mc_dip_interface_local_scope``
- ``drop``
- Traps IPv6 packets that the device decided to drop because they need to
be routed and their IPv6 multicast destination IP has an interface-local scope
(i.e., ffx1::/16)
Driver-specific Packet Traps
============================

27
include/net/devlink.h
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@ -569,6 +569,15 @@ enum devlink_trap_generic_id {
DEVLINK_TRAP_GENERIC_ID_BLACKHOLE_ROUTE,
DEVLINK_TRAP_GENERIC_ID_TTL_ERROR,
DEVLINK_TRAP_GENERIC_ID_TAIL_DROP,
DEVLINK_TRAP_GENERIC_ID_NON_IP_PACKET,
DEVLINK_TRAP_GENERIC_ID_UC_DIP_MC_DMAC,
DEVLINK_TRAP_GENERIC_ID_DIP_LB,
DEVLINK_TRAP_GENERIC_ID_SIP_MC,
DEVLINK_TRAP_GENERIC_ID_SIP_LB,
DEVLINK_TRAP_GENERIC_ID_CORRUPTED_IP_HDR,
DEVLINK_TRAP_GENERIC_ID_IPV4_SIP_BC,
DEVLINK_TRAP_GENERIC_ID_IPV6_MC_DIP_RESERVED_SCOPE,
DEVLINK_TRAP_GENERIC_ID_IPV6_MC_DIP_INTERFACE_LOCAL_SCOPE,
/* Add new generic trap IDs above */
__DEVLINK_TRAP_GENERIC_ID_MAX,
@ -607,6 +616,24 @@ enum devlink_trap_group_generic_id {
"ttl_value_is_too_small"
#define DEVLINK_TRAP_GENERIC_NAME_TAIL_DROP \
"tail_drop"
#define DEVLINK_TRAP_GENERIC_NAME_NON_IP_PACKET \
"non_ip"
#define DEVLINK_TRAP_GENERIC_NAME_UC_DIP_MC_DMAC \
"uc_dip_over_mc_dmac"
#define DEVLINK_TRAP_GENERIC_NAME_DIP_LB \
"dip_is_loopback_address"
#define DEVLINK_TRAP_GENERIC_NAME_SIP_MC \
"sip_is_mc"
#define DEVLINK_TRAP_GENERIC_NAME_SIP_LB \
"sip_is_loopback_address"
#define DEVLINK_TRAP_GENERIC_NAME_CORRUPTED_IP_HDR \
"ip_header_corrupted"
#define DEVLINK_TRAP_GENERIC_NAME_IPV4_SIP_BC \
"ipv4_sip_is_limited_bc"
#define DEVLINK_TRAP_GENERIC_NAME_IPV6_MC_DIP_RESERVED_SCOPE \
"ipv6_mc_dip_reserved_scope"
#define DEVLINK_TRAP_GENERIC_NAME_IPV6_MC_DIP_INTERFACE_LOCAL_SCOPE \
"ipv6_mc_dip_interface_local_scope"
#define DEVLINK_TRAP_GROUP_GENERIC_NAME_L2_DROPS \
"l2_drops"

9
net/core/devlink.c
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@ -7602,6 +7602,15 @@ static const struct devlink_trap devlink_trap_generic[] = {
DEVLINK_TRAP(BLACKHOLE_ROUTE, DROP),
DEVLINK_TRAP(TTL_ERROR, EXCEPTION),
DEVLINK_TRAP(TAIL_DROP, DROP),
DEVLINK_TRAP(NON_IP_PACKET, DROP),
DEVLINK_TRAP(UC_DIP_MC_DMAC, DROP),
DEVLINK_TRAP(DIP_LB, DROP),
DEVLINK_TRAP(SIP_MC, DROP),
DEVLINK_TRAP(SIP_LB, DROP),
DEVLINK_TRAP(CORRUPTED_IP_HDR, DROP),
DEVLINK_TRAP(IPV4_SIP_BC, DROP),
DEVLINK_TRAP(IPV6_MC_DIP_RESERVED_SCOPE, DROP),
DEVLINK_TRAP(IPV6_MC_DIP_INTERFACE_LOCAL_SCOPE, DROP),
};
#define DEVLINK_TRAP_GROUP(_id) \