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mirror-linux/net/ipv6
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Daniel Borkmann 076b8cad77 ipv6: Cap TLV scan in ip6_tnl_parse_tlv_enc_lim 
Commit 47d3d7ac65 ("ipv6: Implement limits on Hop-by-Hop and
Destination options") added net.ipv6.max_{hbh,dst}_opts_{cnt,len}
and applied them in ip6_parse_tlv(), the generic TLV walker
invoked from ipv6_destopt_rcv() and ipv6_parse_hopopts().

ip6_tnl_parse_tlv_enc_lim() does not go through ip6_parse_tlv();
it has its own hand-rolled TLV scanner inside its NEXTHDR_DEST
branch which looks for IPV6_TLV_TNL_ENCAP_LIMIT. That inner
loop is bounded only by optlen, which can be up to 2048 bytes.
Stuffing the Destination Options header with 2046 Pad1 (type=0)
entries advances the scanner a single byte at a time, yielding
~2000 TLV iterations per extension header.

Reusing max_dst_opts_cnt to bound the TLV iterations, matching
the semantics from 47d3d7ac65, would require duplicating
ip6_parse_tlv() to also validate Pad1/PadN payload. It would
also mandate enforcing max_dst_opts_len, since otherwise an
attacker shifts the axis to few options with a giant PadN and
recovers the original DoS. Allowing up to 8 options before the
tunnel encapsulation limit TLV is liberal enough; in practice
encap limit is the first TLV. Thus, go with a hard-coded limit
IP6_TUNNEL_MAX_DEST_TLVS (8).

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Justin Iurman <justin.iurman@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
 		2026-04-23 11:52:07 -07:00
..
ila net: Add SPDX ids to some source files 2026-03-09 18:32:45 -07:00
netfilter netfilter: nat: use kfree_rcu to release ops 2026-04-20 23:45:41 +02:00
Kconfig ipv6: convert CONFIG_IPV6 to built-in only and clean up Kconfigs 2026-03-29 11:21:22 -07:00
Makefile ipv6: Retire UDP-Lite. 2026-03-13 18:57:44 -07:00
addrconf.c Networking changes for 7.1. 2026-04-14 18:36:10 -07:00
addrconf_core.c ipv6: remove ipv6_stub infrastructure completely 2026-03-29 11:21:24 -07:00
addrlabel.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
af_inet6.c tcp: update window_clamp when SO_RCVBUF is set 2026-04-13 15:32:35 +02:00
ah6.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
anycast.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
calipso.c Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses 2026-02-22 08:26:33 -08:00
datagram.c Networking changes for 7.1. 2026-04-14 18:36:10 -07:00
esp6.c esp: fix skb leak with espintcp and async crypto 2026-02-25 09:11:40 +01:00
esp6_offload.c xfrm: Fix inner mode lookup in tunnel mode GSO segmentation 2025-12-04 09:54:53 +01:00
exthdrs.c ipv6: add NULL checks for idev in SRv6 paths 2026-03-18 17:23:43 -07:00
exthdrs_core.c ipv6: Fix out-of-bounds access in ipv6_find_tlv() 2023-05-24 08:43:39 +01:00
exthdrs_offload.c net: gso: add HBH extension header offload support 2024-01-05 08:11:49 -08:00
fib6_notifier.c net: Add SPDX ids to some source files 2026-03-09 18:32:45 -07:00
fib6_rules.c ipv6: export fib6_lookup for nft_fib_ipv6 2026-03-04 11:45:44 +01:00
fou6.c fou: Remove IPPROTO_UDPLITE check in gue_err() and gue6_err(). 2026-03-17 16:10:59 -07:00
icmp.c ipv6: fix possible UAF in icmpv6_rcv() 2026-04-18 12:09:52 -07:00
inet6_connection_sock.c tcp: move inet6_csk_update_pmtu() to tcp_ipv6.c 2026-02-24 17:47:27 -08:00
inet6_hashtables.c tcp: use __jhash_final() in inet6_ehashfn() 2026-03-29 11:45:48 -07:00
ioam6.c net: ioam6: fix OOB and missing lock 2026-04-08 19:08:56 -07:00
ioam6_iptunnel.c ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data() 2026-02-13 12:24:05 -08:00
ip6_checksum.c udp: Remove UDPLITE_SEND_CSCOV and UDPLITE_RECV_CSCOV. 2026-03-13 18:57:45 -07:00
ip6_fib.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-04-02 11:03:13 -07:00
ip6_flowlabel.c net: ipv6: flowlabel: defer exclusive option free until RCU teardown 2026-03-31 15:44:29 -07:00
ip6_gre.c gre: Count GRE packet drops 2026-04-12 12:33:33 -07:00
ip6_icmp.c ipv6: remove dynamic ICMPv6 sender registration infrastructure 2026-03-29 11:21:23 -07:00
ip6_input.c tcp: move tcp_v6_early_demux() to net/ipv6/ip6_input.c 2026-03-05 18:33:51 -08:00
ip6_offload.c ipv6: replace IS_BUILTIN(CONFIG_IPV6) with IS_ENABLED(CONFIG_IPV6) 2026-03-29 11:21:23 -07:00
ip6_offload.h
…
ip6_output.c ipv6: move ip6_dst_hoplimit() to net/ipv6/ip6_output.c 2026-04-01 18:50:35 -07:00
ip6_tunnel.c ipv6: Cap TLV scan in ip6_tnl_parse_tlv_enc_lim 2026-04-23 11:52:07 -07:00
ip6_udp_tunnel.c ipv6: remove ipv6_stub infrastructure completely 2026-03-29 11:21:24 -07:00
ip6_vti.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
ip6mr.c ipmr/ip6mr: Convert net->ipv[46].ipmr_seq to atomic_t. 2026-03-02 18:49:41 -08:00
ipcomp6.c xfrm: delete x->tunnel as we delete x 2025-07-08 13:28:27 +02:00
ipv6_sockglue.c ipv6: Remove UDP-Lite support for IPV6_ADDRFORM. 2026-03-13 18:57:44 -07:00
mcast.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
mcast_snoop.c
…
mip6.c net: fill in MODULE_DESCRIPTION()s for ipv6 modules 2024-02-09 14:12:01 -08:00
ndisc.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-04-02 11:03:13 -07:00
netfilter.c netfilter: remove nf_ipv6_ops and use direct function calls 2026-03-29 11:21:24 -07:00
output_core.c ipv6: move ip6_dst_hoplimit() to net/ipv6/ip6_output.c 2026-04-01 18:50:35 -07:00
ping.c net: remove addr_len argument of recvmsg() handlers 2026-03-02 18:17:17 -08:00
proc.c udp: Remove UDP-Lite SNMP stats. 2026-03-13 18:57:44 -07:00
protocol.c
…
raw.c net: change sock_queue_rcv_skb_reason() to return a drop_reason 2026-04-12 14:30:25 -07:00
reassembly.c ipv6: discard fragment queue earlier if there is malformed datagram 2026-02-27 19:08:54 -08:00
route.c ipv6: prepare headers for ipv6_stub removal 2026-03-29 11:21:23 -07:00
rpl.c ipv6: rpl: Remove pskb(_may)?_pull() in ipv6_rpl_srh_rcv(). 2023-06-19 11:32:58 -07:00
rpl_iptunnel.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-07-17 11:00:33 -07:00
seg6.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
seg6_hmac.c ipv6: add NULL checks for idev in SRv6 paths 2026-03-18 17:23:43 -07:00
seg6_iptunnel.c seg6: fix seg6 lwtunnel output redirect for L2 reduced encap mode 2026-04-22 20:32:38 -07:00
seg6_local.c ipv6: adopt dst_dev() helper 2025-07-02 14:32:30 -07:00
sit.c ipv6: sit: remove redundant ret = 0 assignment 2026-04-09 20:37:40 -07:00
syncookies.c tcp: secure_seq: add back ports to TS offset 2026-03-04 17:44:35 -08:00
sysctl_net_ipv6.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
tcp_ao.c net/tcp: Wire up l3index to TCP-AO 2023-10-27 10:35:46 +01:00
tcp_ipv6.c Networking changes for 7.1. 2026-04-14 18:36:10 -07:00
tcpv6_offload.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-01-29 17:28:54 -08:00
tunnel6.c net: fill in MODULE_DESCRIPTION()s for ipv6 modules 2024-02-09 14:12:01 -08:00
udp.c udp: Force compute_score to always inline 2026-04-13 15:44:42 -07:00
udp_offload.c udp: Don't pass udptable to IPv6 socket lookup functions. 2026-03-13 18:57:46 -07:00
xfrm6_input.c xfrm: hold dev ref until after transport_finish NF_HOOK 2026-04-07 10:12:40 +02:00
xfrm6_output.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
xfrm6_policy.c xfrm6: fix uninitialized saddr in xfrm6_get_saddr() 2026-02-02 08:03:47 +01:00
xfrm6_protocol.c
…
xfrm6_state.c
…
xfrm6_tunnel.c xfrm: flush all states in xfrm_state_fini 2025-08-06 09:23:38 +02:00