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linux/include/net
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Ido Schimmel d12d04d221 ipv6: icmp: Add RFC 5837 support 
Add the ability to append the incoming IP interface information to
ICMPv6 error messages in accordance with RFC 5837 and RFC 4884. This is
required for more meaningful traceroute results in unnumbered networks.

The feature is disabled by default and controlled via a new sysctl
("net.ipv6.icmp.errors_extension_mask") which accepts a bitmask of ICMP
extensions to append to ICMP error messages. Currently, only a single
value is supported, but the interface and the implementation should be
able to support more extensions, if needed.

Clone the skb and copy the relevant data portions before modifying the
skb as the caller of icmp6_send() still owns the skb after the function
returns. This should be fine since by default ICMP error messages are
rate limited to 1000 per second and no more than 1 per second per
specific host.

Trim or pad the packet to 128 bytes before appending the ICMP extension
structure in order to be compatible with legacy applications that assume
that the ICMP extension structure always starts at this offset (the
minimum length specified by RFC 4884).

Since commit 20e1954fe2 ("ipv6: RFC 4884 partial support for SIT/GRE
tunnels") it is possible for icmp6_send() to be called with an skb that
already contains ICMP extensions. This can happen when we receive an
ICMPv4 message with extensions from a tunnel and translate it to an
ICMPv6 message towards an IPv6 host in the overlay network. I could not
find an RFC that supports this behavior, but it makes sense to not
overwrite the original extensions that were appended to the packet.
Therefore, avoid appending extensions if the length field in the
provided ICMPv6 header is already filled.

Export netdev_copy_name() using EXPORT_IPV6_MOD_GPL() to make it
available to IPv6 when it is built as a module.

Reviewed-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20251027082232.232571-3-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
 		2025-10-29 18:28:30 -07:00
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9p
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bluetooth Bluetooth: Avoid a couple dozen -Wflex-array-member-not-at-end warnings 2025-09-27 11:37:43 -04:00
caif caif: Remove unused cfsrvl_getphyid 2024-10-08 15:33:49 -07:00
iucv net: reformat kdoc return statements 2024-12-09 14:44:59 -08:00
libeth xdp, libeth: make the xdp_init_buff() micro-optimization generic 2025-09-08 10:26:25 -07:00
mana net: mana: Use page pool fragments for RX buffers instead of full pages to improve memory efficiency. 2025-08-19 14:42:44 +02:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-09-11 17:40:13 -07:00
netns ipv6: icmp: Add RFC 5837 support 2025-10-29 18:28:30 -07:00
nfc net: nfc: nci: Increase NCI_DATA_TIMEOUT to 3000 ms 2025-09-03 17:02:12 -07:00
page_pool net: add helper to pre-check if PP for an Rx queue will be unreadable 2025-09-04 10:19:17 +02:00
phonet phonet: Convert phonet_routes.lock to spinlock_t. 2024-10-24 16:03:40 +02:00
psp net: psp: don't assume reply skbs will have a socket 2025-10-03 10:23:50 -07:00
sctp sctp: Constify struct sctp_sched_ops 2025-10-28 17:50:55 -07:00
tc_act net_sched: act_skbmod: use RCU in tcf_skbmod_dump() 2025-08-28 16:46:23 -07:00
6lowpan.h
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Space.h
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act_api.h net_sched: act: remove tcfa_qstats 2025-09-02 15:52:24 -07:00
addrconf.h ipv6: Add __in6_dev_get_rtnl_net(). 2025-01-20 12:16:04 -08:00
af_ieee802154.h
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af_rxrpc.h rxrpc: Remove deadcode 2025-04-24 17:03:45 -07:00
af_unix.h af_unix: Introduce SO_INQ. 2025-07-08 18:05:25 -07:00
af_vsock.h vsock: fix `vsock_proto` declaration 2025-07-07 16:55:54 -07:00
ah.h
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aligned_data.h udp: move udp_memory_allocated into net_aligned_data 2025-07-02 14:22:02 -07:00
amt.h
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arp.h
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atmclip.h
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ax25.h ax25: Remove broken autobind 2025-03-24 10:26:53 +00:00
ax88796.h
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bareudp.h
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bond_3ad.h bonding: support aggregator selection based on port priority 2025-09-09 10:56:02 +02:00
bond_alb.h bonding: Correct spelling in headers 2024-08-26 09:37:22 -07:00
bond_options.h bonding: add support for per-port LACP actor priority 2025-09-09 10:56:02 +02:00
bonding.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-10-01 10:14:49 +02:00
bpf_sk_storage.h
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busy_poll.h net: gro: decouple GRO from the NAPI layer 2025-02-27 14:03:14 +01:00
calipso.h move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
cfg80211-wext.h
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cfg80211.h wifi: cfg80211: remove IEEE80211_CHAN_{1,2,4,8,16}MHZ flags 2025-09-22 09:03:14 +02:00
cfg802154.h
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checksum.h net: Fix checksum update for ILA adj-transport 2025-05-30 19:53:51 -07:00
cipso_ipv4.h move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
cls_cgroup.h net/cls_cgroup: Fix task_get_classid() during qdisc run 2025-09-14 11:55:04 -07:00
codel.h
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codel_impl.h
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codel_qdisc.h
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compat.h
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datalink.h
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dcbevent.h
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dcbnl.h
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devlink.h devlink: Add a 'num_doorbells' driverinit param 2025-09-17 18:30:51 -07:00
dropreason-core.h tcp: add datapath logic for PSP with inline key exchange 2025-09-18 12:32:06 +02:00
dropreason.h wifi: mac80211: Drop cooked monitor support 2025-02-11 11:58:17 +01:00
dsa.h net: dsa: tag_yt921x: add support for Motorcomm YT921x tags 2025-10-21 18:25:30 -07:00
dsa_stubs.h
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dscp.h
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dsfield.h
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dst.h net: dst: introduce dst->dev_rcu 2025-08-29 19:36:31 -07:00
dst_cache.h net: Correct spelling in headers 2024-08-26 09:37:23 -07:00
dst_metadata.h net: dst_metadata: fix IP_DF bit not extracted from tunnel headers 2025-09-14 14:28:12 -07:00
dst_ops.h
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eee.h net: simplify eeecfg_mac_can_tx_lpi 2024-11-13 18:49:50 -08:00
erspan.h net: Correct spelling in headers 2024-08-26 09:37:23 -07:00
esp.h
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espintcp.h
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ethoc.h
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failover.h
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fib_notifier.h net: do not acquire rtnl in fib_seq_sum() 2024-10-11 15:35:05 -07:00
fib_rules.h net: fib_rules: Fix iif / oif matching on L3 master device 2025-04-15 17:54:56 -07:00
firewire.h
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flow.h ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
flow_dissector.h flow_dissector: cleanup FLOW_DISSECTOR_KEY_ENC_FLAGS 2024-07-15 09:14:39 -07:00
flow_offload.h net: sched: propagate "skip_sw" flag to struct flow_cls_common_offload 2024-10-30 17:33:53 -07:00
fou.h
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fq.h
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fq_impl.h
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garp.h
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gen_stats.h
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genetlink.h genetlink: fix typo in comment 2025-09-03 15:16:49 -07:00
geneve.h
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gre.h
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gro.h net: gro: remove unnecessary df checks 2025-09-25 12:42:49 +02:00
gro_cells.h
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gso.h
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gtp.h
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gue.h
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handshake.h
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hotdata.h net: add NUMA awareness to skb_attempt_defer_free() 2025-09-30 15:45:53 +02:00
hwbm.h net: Correct spelling in headers 2024-08-26 09:37:23 -07:00
icmp.h ipv4: icmp: Pass IPv4 control block structure as an argument to __icmp_send() 2025-09-11 12:22:38 +02:00
ieee8021q.h
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ieee80211_radiotap.h wireless fixes for v6.12-rc5 2024-10-25 10:44:41 +01:00
ieee802154_netdev.h
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if_inet6.h
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ife.h
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inet6_connection_sock.h tcp/dccp: Remove inet_connection_sock_af_ops.addr2sockaddr(). 2025-03-24 12:10:13 -07:00
inet6_hashtables.h tcp: Remove inet6_hash(). 2025-09-22 11:38:43 -07:00
inet_common.h
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inet_connection_sock.h tcp: Update bind bucket state on port release 2025-09-23 10:12:15 +02:00
inet_dscp.h ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
inet_ecn.h
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inet_frag.h inet: frags: change inet_frag_kill() to defer refcount updates 2025-03-18 13:18:36 +01:00
inet_hashtables.h tcp: Update bind bucket state on port release 2025-09-23 10:12:15 +02:00
inet_sock.h sctp: Remove sctp_copy_sock() and sctp_copy_descendant(). 2025-10-27 18:04:59 -07:00
inet_timewait_sock.h tcp: Update bind bucket state on port release 2025-09-23 10:12:15 +02:00
inetpeer.h inetpeer: remove create argument of inet_getpeer() 2024-12-17 19:37:00 -08:00
ioam6.h
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ip.h net: snmp: remove SNMP_MIB_SENTINEL 2025-09-08 18:06:21 -07:00
ip6_checksum.h
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ip6_fib.h ipv6: Defer fib6_purge_rt() in fib6_add_rt2node() to fib6_add(). 2025-04-24 09:29:56 +02:00
ip6_route.h ipv6: make ipv6_pinfo.daddr_cache a boolean 2025-09-18 10:17:09 +02:00
ip6_tunnel.h ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
ip_fib.h ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
ip_tunnels.h net/ip6_tunnel: Prevent perpetual tunnel growth 2025-10-13 17:43:46 -07:00
ip_vs.h ipvs: Fix estimator kthreads preferred affinity 2025-08-13 08:34:33 +02:00
ipcomp.h xfrm: ipcomp: Use crypto_acomp interface 2025-03-21 17:36:49 +08:00
ipconfig.h
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ipv6.h ipv6: fix _DEVADD() and _DEVUPD() macros 2025-03-25 07:31:24 -07:00
ipv6_frag.h inet: frags: change inet_frag_kill() to defer refcount updates 2025-03-18 13:18:36 +01:00
ipv6_stubs.h ipv6: udp: constify 'struct net' parameter of socket lookups 2024-08-05 16:27:26 -07:00
iw_handler.h Revert "wifi: cfg80211: unexport wireless_nlevent_flush()" 2024-10-09 08:53:01 +02:00
kcm.h net: kcm: Fix race condition in kcm_unattach() 2025-08-13 18:18:33 -07:00
l3mdev.h net: fib_rules: Fix iif / oif matching on L3 master device 2025-04-15 17:54:56 -07:00
lag.h
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lapb.h net: lapb: increase LAPB_HEADER_LEN 2024-12-06 17:43:08 -08:00
llc.h
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llc_c_ac.h
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llc_c_ev.h
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llc_c_st.h llc: Constify struct llc_conn_state_trans 2024-07-15 08:51:01 -07:00
llc_conn.h
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llc_if.h
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llc_pdu.h net: Correct spelling in headers 2024-08-26 09:37:23 -07:00
llc_s_ac.h
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llc_s_ev.h
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llc_s_st.h llc: Constify struct llc_sap_state_trans 2024-07-15 08:51:19 -07:00
llc_sap.h
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lwtunnel.h net: dst: annotate data-races around dst->output 2025-07-02 14:32:30 -07:00
mac80211.h wifi: mac80211: Export an API to check if NAN is started 2025-09-19 11:26:23 +02:00
mac802154.h move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
macsec.h net: macsec: Add endianness annotations in salt struct 2025-01-20 12:20:42 +00:00
mctp.h net: mctp: Allow limiting binds to a peer address 2025-07-15 12:08:39 +02:00
mctpdevice.h net: mctp: Expose transport binding identifier via IFLA attribute 2024-11-09 09:04:54 -08:00
mip6.h
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mld.h
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mpls.h
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mpls_iptunnel.h
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mptcp.h mptcp: sched: remove mptcp_sched_data 2025-04-15 08:21:46 -07:00
mrp.h
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ncsi.h
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ndisc.h net: replace ND_PRINTK with dynamic debug 2025-07-10 15:27:32 -07:00
neighbour.h neighbour: Convert rwlock of struct neigh_table to spinlock. 2025-10-24 17:57:20 -07:00
neighbour_tables.h neighbour: Create netdev->neighbour association 2024-11-09 13:22:57 -08:00
net_debug.h Kbuild updates for v6.13 2024-11-30 13:41:50 -08:00
net_failover.h
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net_namespace.h namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
net_ratelimit.h
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net_shaper.h net-shapers: implement NL get operation 2024-10-10 08:30:22 -07:00
net_trackers.h
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netdev_lock.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-05-22 09:42:41 -07:00
netdev_netlink.h net: add granular lock for the netdev netlink socket 2025-03-12 13:32:35 -07:00
netdev_queues.h net: add helper to pre-check if PP for an Rx queue will be unreadable 2025-09-04 10:19:17 +02:00
netdev_rx_queue.h net: designate XSK pool pointers in queues as "ops protected" 2025-04-09 17:01:51 -07:00
netevent.h
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netkit.h
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netlabel.h Networking changes for 6.13. 2024-11-21 08:28:08 -08:00
netlink.h netlink: introduce type-checking attribute iteration for nlmsg 2025-07-02 15:39:04 -07:00
netmem.h net: netmem: remove NET_IOV_MAX from net_iov_type enum 2025-10-28 17:41:46 -07:00
netprio_cgroup.h
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netrom.h
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nexthop.h ipv6: Protect nh->f6i_list with spinlock and flag. 2025-04-24 09:29:56 +02:00
nl802154.h nl802154: fix some kernel-doc warnings 2025-10-20 17:13:40 -07:00
nsh.h
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pfcp.h net: pfcp: fix typo in message_priority field name 2025-06-13 18:17:08 -07:00
pie.h
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ping.h inet: ping: remove ping_hash() 2025-09-01 13:15:14 -07:00
pkt_cls.h net: sched: refine software bypass handling in tc_run 2025-01-20 09:21:27 +00:00
pkt_sched.h net/sched: Remove unused typedef psched_tdiff_t 2025-10-27 18:05:54 -07:00
pptp.h
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proto_memory.h net: Allow opt-out from global protocol memory accounting. 2025-10-16 12:04:47 -07:00
protocol.h
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psample.h
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psnap.h
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psp.h psp: base PSP device support 2025-09-18 12:32:06 +02:00
raw.h net: use NUMA drop counters for softnet_data.dropped 2025-09-14 11:35:17 -07:00
rawv6.h
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red.h net: sched: Correct spelling in headers 2024-08-26 09:37:23 -07:00
regulatory.h net: Correct spelling in headers 2024-08-26 09:37:23 -07:00
request_sock.h tcp: reclaim 8 bytes in struct request_sock_queue 2025-09-22 17:55:25 -07:00
rose.h net: rose: convert 'use' field to refcount_t 2025-08-27 07:43:08 -07:00
route.h net: use dst_dev_rcu() in sk_setup_caps() 2025-08-29 19:36:32 -07:00
rpl.h
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rps.h net: Add rfs_needed() helper 2025-09-03 15:08:20 -07:00
rsi_91x.h
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rstreason.h net: Retire DCCP socket. 2025-04-11 18:58:10 -07:00
rtnetlink.h rtnetlink: Remove "net" from newlink params 2025-02-21 15:28:03 -08:00
rtnh.h
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sch_generic.h net: dev_queue_xmit() llist adoption 2025-10-16 16:25:10 -07:00
scm.h af_unix/scm: fix whitespace errors 2025-07-04 09:32:35 +02:00
secure_seq.h net: Retire DCCP socket. 2025-04-11 18:58:10 -07:00
seg6.h
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seg6_hmac.h ipv6: sr: Prepare HMAC key ahead of time 2025-08-26 18:11:29 -07:00
seg6_local.h
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selftests.h
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slhc_vj.h
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smc.h dibs: Move event handling to dibs layer 2025-09-23 11:13:22 +02:00
snmp.h net: snmp: remove SNMP_MIB_SENTINEL 2025-09-08 18:06:21 -07:00
sock.h net: Add sk_clone(). 2025-10-27 18:04:57 -07:00
sock_reuseport.h net: core: annotate socks of struct sock_reuseport with __counted_by 2024-08-02 17:16:59 -07:00
stp.h
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strparser.h strparser: Remove unused __strp_unpause 2025-05-05 16:48:12 -07:00
switchdev.h
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tc_wrapper.h
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tcp.h bpf-next-for-netdev 2025-10-17 17:20:42 -07:00
tcp_ao.h tcp: Free TCP-AO/TCP-MD5 info/keys without RCU 2025-09-11 19:05:56 -07:00
tcp_ecn.h tcp: accecn: AccECN option failure handling 2025-09-18 08:47:52 +02:00
tcp_states.h
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tcx.h bpf: Remove location field in tcx_link 2025-07-11 11:00:57 -07:00
timewait_sock.h tcp: Remove timewait_sock_ops.twsk_destructor(). 2025-08-25 17:53:35 -07:00
tipc.h
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tls.h net/tls: support setting the maximum payload size 2025-10-27 16:13:42 -07:00
tls_prot.h
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tls_toe.h
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transp_v6.h
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tso.h
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tun_proto.h
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udp.h udp: remove busylock and add per NUMA queues 2025-09-23 16:38:39 -07:00
udp_tunnel.h udp_tunnel: fix deadlock in udp_tunnel_nic_set_port_priv() 2025-06-24 16:31:36 -07:00
udplite.h
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vsock_addr.h
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vxlan.h vxlan: Support MC routing in the underlay 2025-06-17 18:18:46 -07:00
wext.h
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x25.h net/x25: Remove unused x25_terminate_link() 2025-07-14 17:19:13 -07:00
x25device.h
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xdp.h bpf-next-for-netdev 2025-09-24 10:22:37 -07:00
xdp_priv.h
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xdp_sock.h net: xsk: introduce XDP_MAX_TX_SKB_BUDGET setsockopt 2025-07-10 14:48:29 +02:00
xdp_sock_drv.h bpf: Allow bpf_xdp_shrink_data to shrink a frag from head and tail 2025-09-23 13:35:12 -07:00
xfrm.h Revert "xfrm: destroy xfrm_state synchronously on net exit path" 2025-07-08 13:28:29 +02:00
xsk_buff_pool.h xsk: Fix offset calculation in unaligned mode 2025-04-24 17:11:52 -07:00