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net: skb: move enum skb_drop_reason to standalone header file
As the skb drop reasons are getting more and more, move the enum 'skb_drop_reason' and related function to the standalone header 'dropreason.h', as Jakub Kicinski suggested. Signed-off-by: Menglong Dong <[email protected]> Signed-off-by: Paolo Abeni <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| /* SPDX-License-Identifier: GPL-2.0-or-later */ | ||
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|
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| #ifndef _LINUX_DROPREASON_H | ||
| #define _LINUX_DROPREASON_H | ||
|
|
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| /* The reason of skb drop, which is used in kfree_skb_reason(). | ||
| * en...maybe they should be splited by group? | ||
| * | ||
| * Each item here should also be in 'TRACE_SKB_DROP_REASON', which is | ||
| * used to translate the reason to string. | ||
| */ | ||
| enum skb_drop_reason { | ||
| SKB_NOT_DROPPED_YET = 0, | ||
| SKB_DROP_REASON_NOT_SPECIFIED, /* drop reason is not specified */ | ||
| SKB_DROP_REASON_NO_SOCKET, /* socket not found */ | ||
| SKB_DROP_REASON_PKT_TOO_SMALL, /* packet size is too small */ | ||
| SKB_DROP_REASON_TCP_CSUM, /* TCP checksum error */ | ||
| SKB_DROP_REASON_SOCKET_FILTER, /* dropped by socket filter */ | ||
| SKB_DROP_REASON_UDP_CSUM, /* UDP checksum error */ | ||
| SKB_DROP_REASON_NETFILTER_DROP, /* dropped by netfilter */ | ||
| SKB_DROP_REASON_OTHERHOST, /* packet don't belong to current | ||
| * host (interface is in promisc | ||
| * mode) | ||
| */ | ||
| SKB_DROP_REASON_IP_CSUM, /* IP checksum error */ | ||
| SKB_DROP_REASON_IP_INHDR, /* there is something wrong with | ||
| * IP header (see | ||
| * IPSTATS_MIB_INHDRERRORS) | ||
| */ | ||
| SKB_DROP_REASON_IP_RPFILTER, /* IP rpfilter validate failed. | ||
| * see the document for rp_filter | ||
| * in ip-sysctl.rst for more | ||
| * information | ||
| */ | ||
| SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST, /* destination address of L2 | ||
| * is multicast, but L3 is | ||
| * unicast. | ||
| */ | ||
| SKB_DROP_REASON_XFRM_POLICY, /* xfrm policy check failed */ | ||
| SKB_DROP_REASON_IP_NOPROTO, /* no support for IP protocol */ | ||
| SKB_DROP_REASON_SOCKET_RCVBUFF, /* socket receive buff is full */ | ||
| SKB_DROP_REASON_PROTO_MEM, /* proto memory limition, such as | ||
| * udp packet drop out of | ||
| * udp_memory_allocated. | ||
| */ | ||
| SKB_DROP_REASON_TCP_MD5NOTFOUND, /* no MD5 hash and one | ||
| * expected, corresponding | ||
| * to LINUX_MIB_TCPMD5NOTFOUND | ||
| */ | ||
| SKB_DROP_REASON_TCP_MD5UNEXPECTED, /* MD5 hash and we're not | ||
| * expecting one, corresponding | ||
| * to LINUX_MIB_TCPMD5UNEXPECTED | ||
| */ | ||
| SKB_DROP_REASON_TCP_MD5FAILURE, /* MD5 hash and its wrong, | ||
| * corresponding to | ||
| * LINUX_MIB_TCPMD5FAILURE | ||
| */ | ||
| SKB_DROP_REASON_SOCKET_BACKLOG, /* failed to add skb to socket | ||
| * backlog (see | ||
| * LINUX_MIB_TCPBACKLOGDROP) | ||
| */ | ||
| SKB_DROP_REASON_TCP_FLAGS, /* TCP flags invalid */ | ||
| SKB_DROP_REASON_TCP_ZEROWINDOW, /* TCP receive window size is zero, | ||
| * see LINUX_MIB_TCPZEROWINDOWDROP | ||
| */ | ||
| SKB_DROP_REASON_TCP_OLD_DATA, /* the TCP data reveived is already | ||
| * received before (spurious retrans | ||
| * may happened), see | ||
| * LINUX_MIB_DELAYEDACKLOST | ||
| */ | ||
| SKB_DROP_REASON_TCP_OVERWINDOW, /* the TCP data is out of window, | ||
| * the seq of the first byte exceed | ||
| * the right edges of receive | ||
| * window | ||
| */ | ||
| SKB_DROP_REASON_TCP_OFOMERGE, /* the data of skb is already in | ||
| * the ofo queue, corresponding to | ||
| * LINUX_MIB_TCPOFOMERGE | ||
| */ | ||
| SKB_DROP_REASON_TCP_RFC7323_PAWS, /* PAWS check, corresponding to | ||
| * LINUX_MIB_PAWSESTABREJECTED | ||
| */ | ||
| SKB_DROP_REASON_TCP_INVALID_SEQUENCE, /* Not acceptable SEQ field */ | ||
| SKB_DROP_REASON_TCP_RESET, /* Invalid RST packet */ | ||
| SKB_DROP_REASON_TCP_INVALID_SYN, /* Incoming packet has unexpected SYN flag */ | ||
| SKB_DROP_REASON_TCP_CLOSE, /* TCP socket in CLOSE state */ | ||
| SKB_DROP_REASON_TCP_FASTOPEN, /* dropped by FASTOPEN request socket */ | ||
| SKB_DROP_REASON_TCP_OLD_ACK, /* TCP ACK is old, but in window */ | ||
| SKB_DROP_REASON_TCP_TOO_OLD_ACK, /* TCP ACK is too old */ | ||
| SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, /* TCP ACK for data we haven't sent yet */ | ||
| SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, /* pruned from TCP OFO queue */ | ||
| SKB_DROP_REASON_TCP_OFO_DROP, /* data already in receive queue */ | ||
| SKB_DROP_REASON_IP_OUTNOROUTES, /* route lookup failed */ | ||
| SKB_DROP_REASON_BPF_CGROUP_EGRESS, /* dropped by | ||
| * BPF_PROG_TYPE_CGROUP_SKB | ||
| * eBPF program | ||
| */ | ||
| SKB_DROP_REASON_IPV6DISABLED, /* IPv6 is disabled on the device */ | ||
| SKB_DROP_REASON_NEIGH_CREATEFAIL, /* failed to create neigh | ||
| * entry | ||
| */ | ||
| SKB_DROP_REASON_NEIGH_FAILED, /* neigh entry in failed state */ | ||
| SKB_DROP_REASON_NEIGH_QUEUEFULL, /* arp_queue for neigh | ||
| * entry is full | ||
| */ | ||
| SKB_DROP_REASON_NEIGH_DEAD, /* neigh entry is dead */ | ||
| SKB_DROP_REASON_TC_EGRESS, /* dropped in TC egress HOOK */ | ||
| SKB_DROP_REASON_QDISC_DROP, /* dropped by qdisc when packet | ||
| * outputting (failed to enqueue to | ||
| * current qdisc) | ||
| */ | ||
| SKB_DROP_REASON_CPU_BACKLOG, /* failed to enqueue the skb to | ||
| * the per CPU backlog queue. This | ||
| * can be caused by backlog queue | ||
| * full (see netdev_max_backlog in | ||
| * net.rst) or RPS flow limit | ||
| */ | ||
| SKB_DROP_REASON_XDP, /* dropped by XDP in input path */ | ||
| SKB_DROP_REASON_TC_INGRESS, /* dropped in TC ingress HOOK */ | ||
| SKB_DROP_REASON_UNHANDLED_PROTO, /* protocol not implemented | ||
| * or not supported | ||
| */ | ||
| SKB_DROP_REASON_SKB_CSUM, /* sk_buff checksum computation | ||
| * error | ||
| */ | ||
| SKB_DROP_REASON_SKB_GSO_SEG, /* gso segmentation error */ | ||
| SKB_DROP_REASON_SKB_UCOPY_FAULT, /* failed to copy data from | ||
| * user space, e.g., via | ||
| * zerocopy_sg_from_iter() | ||
| * or skb_orphan_frags_rx() | ||
| */ | ||
| SKB_DROP_REASON_DEV_HDR, /* device driver specific | ||
| * header/metadata is invalid | ||
| */ | ||
| /* the device is not ready to xmit/recv due to any of its data | ||
| * structure that is not up/ready/initialized, e.g., the IFF_UP is | ||
| * not set, or driver specific tun->tfiles[txq] is not initialized | ||
| */ | ||
| SKB_DROP_REASON_DEV_READY, | ||
| SKB_DROP_REASON_FULL_RING, /* ring buffer is full */ | ||
| SKB_DROP_REASON_NOMEM, /* error due to OOM */ | ||
| SKB_DROP_REASON_HDR_TRUNC, /* failed to trunc/extract the header | ||
| * from networking data, e.g., failed | ||
| * to pull the protocol header from | ||
| * frags via pskb_may_pull() | ||
| */ | ||
| SKB_DROP_REASON_TAP_FILTER, /* dropped by (ebpf) filter directly | ||
| * attached to tun/tap, e.g., via | ||
| * TUNSETFILTEREBPF | ||
| */ | ||
| SKB_DROP_REASON_TAP_TXFILTER, /* dropped by tx filter implemented | ||
| * at tun/tap, e.g., check_filter() | ||
| */ | ||
| SKB_DROP_REASON_ICMP_CSUM, /* ICMP checksum error */ | ||
| SKB_DROP_REASON_INVALID_PROTO, /* the packet doesn't follow RFC | ||
| * 2211, such as a broadcasts | ||
| * ICMP_TIMESTAMP | ||
| */ | ||
| SKB_DROP_REASON_IP_INADDRERRORS, /* host unreachable, corresponding | ||
| * to IPSTATS_MIB_INADDRERRORS | ||
| */ | ||
| SKB_DROP_REASON_IP_INNOROUTES, /* network unreachable, corresponding | ||
| * to IPSTATS_MIB_INADDRERRORS | ||
| */ | ||
| SKB_DROP_REASON_PKT_TOO_BIG, /* packet size is too big (maybe exceed | ||
| * the MTU) | ||
| */ | ||
| SKB_DROP_REASON_MAX, | ||
| }; | ||
|
|
||
| #define SKB_DR_INIT(name, reason) \ | ||
| enum skb_drop_reason name = SKB_DROP_REASON_##reason | ||
| #define SKB_DR(name) \ | ||
| SKB_DR_INIT(name, NOT_SPECIFIED) | ||
| #define SKB_DR_SET(name, reason) \ | ||
| (name = SKB_DROP_REASON_##reason) | ||
| #define SKB_DR_OR(name, reason) \ | ||
| do { \ | ||
| if (name == SKB_DROP_REASON_NOT_SPECIFIED || \ | ||
| name == SKB_NOT_DROPPED_YET) \ | ||
| SKB_DR_SET(name, reason); \ | ||
| } while (0) | ||
|
|
||
| #endif |