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f1c02cfb7b
linux_dsm_epyc7002/net/ipv6
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Sabrina Dubroca f1c02cfb7b ipv6: allow userspace to add IFA_F_OPTIMISTIC addresses 
According to RFC 4429 (section 3.1), adding new IPv6 addresses as
optimistic addresses is acceptable, as long as the implementation
follows some rules:

   * Optimistic DAD SHOULD only be used when the implementation is aware
        that the address is based on a most likely unique interface
        identifier (such as in [RFC2464]), generated randomly [RFC3041],
        or by a well-distributed hash function [RFC3972] or assigned by
        Dynamic Host Configuration Protocol for IPv6 (DHCPv6) [RFC3315].
        Optimistic DAD SHOULD NOT be used for manually entered
        addresses.

Thus, it seems reasonable to allow userspace to set the optimistic flag
when adding new addresses.

We must not let userspace set NODAD + OPTIMISTIC, since if the kernel is
not performing DAD we would never clear the optimistic flag. We must
also ignore userspace's request to add OPTIMISTIC flag to addresses that
have already completed DAD (addresses that don't have the TENTATIVE
flag, or that have the DADFAILED flag).

Then we also need to clear the OPTIMISTIC flag on permanent addresses
when DAD fails. Otherwise, IFA_F_OPTIMISTIC addresses added by userspace
can still be used after DAD has failed, because in
ipv6_chk_addr_and_flags(), IFA_F_OPTIMISTIC overrides IFA_F_TENTATIVE.

Setting IFA_F_OPTIMISTIC from userspace is conditional on
CONFIG_IPV6_OPTIMISTIC_DAD and the optimistic_dad sysctl.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-01 13:43:06 -05:00
..
ila net: Convert ila_net_ops 2018-02-27 11:01:39 -05:00
netfilter net: Convert defrag6_net_ops 2018-02-27 11:01:39 -05:00
addrconf_core.c net: ipv6: Make inet6addr_validator a blocking notifier 2017-10-20 13:15:07 +01:00
addrconf.c ipv6: allow userspace to add IFA_F_OPTIMISTIC addresses 2018-03-01 13:43:06 -05:00
addrlabel.c net: Convert fib6_net_ops, ipv6_addr_label_ops and ip6_segments_ops 2018-02-19 14:19:11 -05:00
af_inet6.c net: Convert inet6_net_ops 2018-02-19 14:19:09 -05:00
ah6.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2017-11-15 11:56:19 -08:00
anycast.c inet: whitespace cleanup 2018-02-28 11:43:28 -05:00
calipso.c net, calipso: convert calipso_doi.refcount from atomic_t to refcount_t 2017-07-04 22:35:16 +01:00
datagram.c net: ipv6: Allow connect to linklocal address from socket bound to vrf 2018-01-08 14:11:18 -05:00
esp6_offload.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-23 13:51:56 -05:00
esp6.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-17 00:10:42 -05:00
exthdrs_core.c inet: whitespace cleanup 2018-02-28 11:43:28 -05:00
exthdrs_offload.c ipv6: fix exthdrs offload registration in out_rt path 2015-09-02 15:31:00 -07:00
exthdrs.c ipv6: sr: fix TLVs not being copied using setsockopt 2018-01-10 16:03:55 -05:00
fib6_notifier.c net: Add module reference to FIB notifiers 2017-09-01 20:33:42 -07:00
fib6_rules.c ipv6: route: dissect flow in input path if fib rules need it 2018-02-28 22:44:44 -05:00
fou6.c fou: make local function static 2017-05-21 13:42:36 -04:00
icmp.c ipv6: route: dissect flow in input path if fib rules need it 2018-02-28 22:44:44 -05:00
inet6_connection_sock.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-01-28 10:33:06 -05:00
inet6_hashtables.c inet: Add a 2nd listener hashtable (port+addr) 2017-12-03 10:18:28 -05:00
ip6_checksum.c udplite: fix partial checksum initialization 2018-02-16 15:57:42 -05:00
ip6_fib.c net: Convert fib6_net_ops, ipv6_addr_label_ops and ip6_segments_ops 2018-02-19 14:19:11 -05:00
ip6_flowlabel.c net: Convert ip6_flowlabel_net_ops 2018-02-19 14:19:11 -05:00
ip6_gre.c net: GRE: Add is_gretap_dev, is_ip6gretap_dev 2018-02-27 14:46:26 -05:00
ip6_icmp.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ip6_input.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-04-20 10:35:33 -04:00
ip6_offload.c gso: fix payload length when gso_size is zero 2017-10-08 10:12:15 -07:00
ip6_offload.h udp: Add GRO functions to UDP socket 2016-04-07 16:53:29 -04:00
ip6_output.c ip6mr: Make mroute_sk rcu-based 2018-03-01 13:13:23 -05:00
ip6_tunnel.c net: Convert ip6_tnl_net_ops 2018-02-27 11:01:38 -05:00
ip6_udp_tunnel.c ip6_udp_tunnel: remove unused IPCB related codes 2016-11-02 15:18:36 -04:00
ip6_vti.c net: Convert vti6_net_ops 2018-02-27 11:01:38 -05:00
ip6mr.c ipmr, ip6mr: Unite dumproute flows 2018-03-01 13:13:23 -05:00
ipcomp6.c net: inet: Support UID-based routing in IP protocols. 2016-11-04 14:45:23 -04:00
ipv6_sockglue.c inet: whitespace cleanup 2018-02-28 11:43:28 -05:00
Kconfig ipmr,ipmr6: Define a uniform vif_device 2018-03-01 13:13:23 -05:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mcast_snoop.c net: fix wrong skb_get() usage / crash in IGMP/MLD parsing code 2015-08-13 17:08:39 -07:00
mcast.c net: Convert icmpv6_sk_ops, ndisc_net_ops and igmp6_net_ops 2018-02-19 14:19:10 -05:00
mip6.c ktime: Get rid of ktime_equal() 2016-12-25 17:21:23 +01:00
ndisc.c net: Convert icmpv6_sk_ops, ndisc_net_ops and igmp6_net_ops 2018-02-19 14:19:10 -05:00
netfilter.c netfilter: remove struct nf_afinfo and its helper functions 2018-01-08 18:11:02 +01:00
output_core.c net: accept UFO datagrams from tuntap and packet 2017-11-24 01:37:35 +09:00
ping.c net: Convert ping_v6_net_ops 2018-02-19 14:19:11 -05:00
proc.c inet: whitespace cleanup 2018-02-28 11:43:28 -05:00
protocol.c net: Add sysctl to toggle early demux for tcp and udp 2017-03-24 13:17:07 -07:00
raw.c net: Convert raw6_net_ops, udplite6_net_ops, ipv6_proc_ops, if6_proc_net_ops and ip6_route_net_late_ops 2018-02-19 14:19:10 -05:00
reassembly.c net: Convert ip6_frags_ops 2018-02-19 14:19:11 -05:00
route.c ipv6: route: dissect flow in input path if fib rules need it 2018-02-28 22:44:44 -05:00
seg6_hmac.c ipv6: sr: Use ARRAY_SIZE macro 2017-09-01 18:35:23 -07:00
seg6_iptunnel.c ipv6: sr: add support for encapsulation of L2 frames 2017-08-25 17:10:23 -07:00
seg6_local.c ipv6: use ARRAY_SIZE for array sizing calculation on array seg6_action_table 2018-01-09 11:40:46 -05:00
seg6.c net: Convert fib6_net_ops, ipv6_addr_label_ops and ip6_segments_ops 2018-02-19 14:19:11 -05:00
sit.c net: Convert sit_net_ops 2018-02-27 11:01:38 -05:00
syncookies.c tcp: Namespace-ify sysctl_tcp_workaround_signed_windows 2017-10-28 19:24:38 +09:00
sysctl_net_ipv6.c net: Convert ipv6_sysctl_net_ops 2018-02-19 14:19:11 -05:00
tcp_ipv6.c net: Convert tcpv6_net_ops 2018-02-19 14:19:10 -05:00
tcpv6_offload.c gso: validate gso_type in GSO handlers 2018-01-22 16:01:30 -05:00
tunnel6.c ipv6: fix tunnel error handling 2015-11-03 10:52:13 -05:00
udp_impl.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
udp_offload.c gso: validate gso_type in GSO handlers 2018-01-22 16:01:30 -05:00
udp.c net: delete /proc THIS_MODULE references 2018-01-16 15:01:33 -05:00
udplite.c net: Convert ip_tables_net_ops, udplite6_net_ops and xt_net_ops 2018-02-19 14:19:12 -05:00
xfrm6_input.c xfrm: Reinject transport-mode packets through tasklet 2017-12-19 08:23:21 +01:00
xfrm6_mode_beet.c networking: make skb_pull & friends return void pointers 2017-06-16 11:48:39 -04:00
xfrm6_mode_ro.c ipv6: xfrm: Handle errors reported by xfrm6_find_1stfragopt() 2017-06-02 13:57:27 -04:00
xfrm6_mode_transport.c ipv6: xfrm: Handle errors reported by xfrm6_find_1stfragopt() 2017-06-02 13:57:27 -04:00
xfrm6_mode_tunnel.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-24 23:44:15 -05:00
xfrm6_output.c xfrm: Add an IPsec hardware offloading API 2017-04-14 10:06:10 +02:00
xfrm6_policy.c net: Convert xfrm6_net_ops 2018-02-19 14:19:11 -05:00
xfrm6_protocol.c xfrm: input: constify xfrm_input_afinfo 2017-02-09 10:22:17 +01:00
xfrm6_state.c inet: whitespace cleanup 2018-02-28 11:43:28 -05:00
xfrm6_tunnel.c net: Convert simple pernet_operations 2018-02-27 11:01:35 -05:00