Ignat Korchagin ed6ae5ca43 sit: allow encapsulated IPv6 traffic to be delivered locally ... While experimenting with FOU encapsulation Amir noticed that encapsulated IPv6 traffic fails to be delivered, if the peer IP address is configured locally. It can be easily verified by creating a sit interface like below: $ sudo ip link add name fou_test type sit remote 127.0.0.1 encap fou encap-sport auto encap-dport 1111 $ sudo ip link set fou_test up and sending some IPv4 and IPv6 traffic to it $ ping -I fou_test -c 1 1.1.1.1 $ ping6 -I fou_test -c 1 fe80::d0b0:dfff:fe4c:fcbc "tcpdump -i any udp dst port 1111" will confirm that only the first IPv4 ping was encapsulated and attempted to be delivered. This seems like a limitation: for example, in a cloud environment the "peer" service may be arbitrarily scheduled on any server within the cluster, where all nodes are trying to send encapsulated traffic. And the unlucky node will not be able to. Moreover, delivering encapsulated IPv4 traffic locally is allowed. But I may not have all the context about this restriction and this code predates the observable git history. Reported-by: Amir Razmjou <arazmjou@cloudflare.com> Signed-off-by: Ignat Korchagin <ignat@cloudflare.com> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/r/20220107123842.211335-1-ignat@cloudflare.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2022-01-12 13:56:07 -08:00
..
ila	net: ipv6: check return value of rhashtable_init	2021-09-28 12:59:24 +01:00
netfilter	netfilter: flowtable: remove ipv4/ipv6 modules	2021-12-23 01:07:44 +01:00
Kconfig	ipv6: ioam: Add support for the ip6ip6 encapsulation	2021-10-04 12:53:35 +01:00
Makefile	net: ipv6: use ipv6-y directly instead of ipv6-objs	2021-09-28 13:13:40 +01:00
addrconf.c	ipv6: add net device refcount tracker to struct inet6_dev	2021-12-06 16:05:11 -08:00
addrconf_core.c	ipv6: add net device refcount tracker to struct inet6_dev	2021-12-06 16:05:11 -08:00
addrlabel.c	ipv6: addrlabel: fix possible memory leak in ip6addrlbl_net_init	2020-11-25 11:20:16 -08:00
af_inet6.c	net: bpf: Handle return value of BPF_CGROUP_RUN_PROG_INET{4,6}_POST_BIND()	2022-01-06 17:08:35 -08:00
ah6.c	ipv6: ah6: use swap() to make code cleaner	2021-11-18 12:00:15 +00:00
anycast.c	ipv6: fix memory leaks on IPV6_ADDRFORM path	2020-07-30 16:30:55 -07:00
calipso.c	cipso,calipso: resolve a number of problems with the DOI refcounts	2021-03-04 15:26:57 -08:00
datagram.c	lsm,selinux: pass flowi_common instead of flowi to the LSM hooks	2020-11-23 18:36:21 -05:00
esp6.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next	2022-01-06 11:54:20 +00:00
esp6_offload.c	net: move gro definitions to include/net/gro.h	2021-11-16 13:16:54 +00:00
exthdrs.c	ipv6: Remove duplicate statements	2021-11-14 12:20:44 +00:00
exthdrs_core.c	ipv6: remove printk	2019-07-27 14:23:48 -07:00
exthdrs_offload.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
fib6_notifier.c	net: fib_notifier: propagate extack down to the notifier block callback	2019-10-04 11:10:56 -07:00
fib6_rules.c	fib: rules: remove duplicated nla policies	2021-12-16 07:18:35 -08:00
fou6.c	net: Add MODULE_DESCRIPTION entries to network modules	2020-06-20 21:33:57 -07:00
icmp.c	icmp: ICMPV6: Examine invoking packet for Segment Route Headers.	2022-01-04 12:17:35 +00:00
inet6_connection_sock.c	lsm,selinux: pass flowi_common instead of flowi to the LSM hooks	2020-11-23 18:36:21 -05:00
inet6_hashtables.c	bpf: Add ingress_ifindex to bpf_sk_lookup	2021-11-10 16:29:58 -08:00
ioam6.c	ipv6: ioam: Support for Queue depth data field	2022-01-02 12:15:13 +00:00
ioam6_iptunnel.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-10-14 16:50:14 -07:00
ip6_checksum.c	net: udp: fix handling of CHECKSUM_COMPLETE packets	2018-10-24 14:18:16 -07:00
ip6_fib.c	net: Don't include filter.h from net/sock.h	2021-12-29 08:48:14 -08:00
ip6_flowlabel.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-08-05 20:13:21 -07:00
ip6_gre.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2022-01-09 17:00:17 -08:00
ip6_icmp.c	net: icmp: pass zeroed opts from icmp{,v6}_ndo_send before sending	2021-02-23 11:29:52 -08:00
ip6_input.c	ipv6: weaken the v4mapped source check	2021-03-18 11:19:23 -07:00
ip6_offload.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-12-02 11:44:56 -08:00
ip6_offload.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
ip6_output.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-11-26 13:45:19 -08:00
ip6_tunnel.c	ipv6: add net device refcount tracker to struct ip6_tnl	2021-12-06 16:05:11 -08:00
ip6_udp_tunnel.c	net: Make locking in sock_bindtoindex optional	2020-06-01 14:57:14 -07:00
ip6_vti.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-12-30 12:12:12 -08:00
ip6mr.c	fib: rules: remove duplicated nla policies	2021-12-16 07:18:35 -08:00
ipcomp6.c	xfrm: remove hdr_offset indirection	2021-06-11 14:48:50 +02:00
ipv6_sockglue.c	net-ipv6: changes to ->tclass (via IPV6_TCLASS) should sk_dst_reset()	2021-11-24 18:57:23 -08:00
mcast.c	ipv6: change return type from int to void for mld_process_v2	2021-09-02 11:29:55 +01:00
mcast_snoop.c	net: bridge: mcast: fix broken length + header check for MRDv6 Adv.	2021-04-27 14:02:06 -07:00
mip6.c	xfrm: ipv6: move mip6_rthdr_offset into xfrm core	2021-06-11 14:48:50 +02:00
ndisc.c	net: ndisc: introduce ndisc_evict_nocarrier sysctl parameter	2021-11-01 19:57:14 -07:00
netfilter.c	netfilter: Dissect flow after packet mangling	2021-04-18 22:04:16 +02:00
output_core.c	ipv6: use prandom_u32() for ID generation	2021-05-31 22:12:08 -07:00
ping.c	net: bpf: Handle return value of BPF_CGROUP_RUN_PROG_INET{4,6}_POST_BIND()	2022-01-06 17:08:35 -08:00
proc.c	net: udp: introduce UDP_MIB_MEMERRORS for udp_mem	2020-11-09 15:34:44 -08:00
protocol.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
raw.c	ipv6: raw: check passed optlen before reading	2021-12-29 12:32:56 -08:00
reassembly.c	ipv6: record frag_max_size in atomic fragments in input path	2021-05-21 15:02:25 -07:00
route.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2022-01-05 14:36:10 -08:00
rpl.c	net: ipv6: rpl*: Fix strange kerneldoc warnings due to bad header	2020-10-30 12:12:52 -07:00
rpl_iptunnel.c	net: ipv6: rpl_iptunnel: simplify the return expression of rpl_do_srh()	2020-12-08 16:22:54 -08:00
seg6.c	icmp: ICMPV6: Examine invoking packet for Segment Route Headers.	2022-01-04 12:17:35 +00:00
seg6_hmac.c	net: ipv6: check return value of rhashtable_init	2021-09-28 12:59:24 +01:00
seg6_iptunnel.c	seg6: fix the iif in the IPv6 socket control block	2021-12-09 07:55:42 -08:00
seg6_local.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2022-01-05 14:36:10 -08:00
sit.c	sit: allow encapsulated IPv6 traffic to be delivered locally	2022-01-12 13:56:07 -08:00
syncookies.c	net: align static siphash keys	2021-11-16 19:07:54 -08:00
sysctl_net_ipv6.c	ipv6: ioam: Data plane support for Pre-allocated Trace	2021-07-21 08:14:33 -07:00
tcp_ipv6.c	net: bpf: Handle return value of BPF_CGROUP_RUN_PROG_INET{4,6}_POST_BIND()	2022-01-06 17:08:35 -08:00
tcpv6_offload.c	net: move gro definitions to include/net/gro.h	2021-11-16 13:16:54 +00:00
tunnel6.c	tunnel6: add tunnel6_input_afinfo for ipip and ipv6 tunnels	2020-07-09 12:52:37 +02:00
udp.c	Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2022-01-06 18:07:26 -08:00
udp_impl.h	net: pass a sockptr_t into ->setsockopt	2020-07-24 15:41:54 -07:00
udp_offload.c	gro: remove rcu_read_lock/rcu_read_unlock from gro_receive handlers	2021-11-24 17:21:42 -08:00
udplite.c	net/ipv6: remove compat_ipv6_{get,set}sockopt	2020-07-19 18:16:41 -07:00
xfrm6_input.c	xfrm: state: remove extract_input indirection from xfrm_state_afinfo	2020-05-06 09:40:08 +02:00
xfrm6_output.c	net: ipv6: fix return value of ip6_skb_dst_mtu	2021-07-02 11:57:01 -07:00
xfrm6_policy.c	xfrm: use net device refcount tracker helpers	2021-12-09 11:51:45 -08:00
xfrm6_protocol.c	xfrm: add support for UDPv6 encapsulation of ESP	2020-04-28 11:28:36 +02:00
xfrm6_state.c	xfrm: remove output_finish indirection from xfrm_state_afinfo	2020-05-06 09:40:08 +02:00
xfrm6_tunnel.c	xfrm: remove description from xfrm_type struct	2021-06-09 09:38:52 +02:00