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net/ipv6: Expand and rename accept_unsolicited_na to accept_untracked_na 

RFC 9131 changes default behaviour of handling RX of NA messages when the
corresponding entry is absent in the neighbour cache. The current
implementation is limited to accept just unsolicited NAs. However, the
RFC is more generic where it also accepts solicited NAs. Both types
should result in adding a STALE entry for this case.

Expand accept_untracked_na behaviour to also accept solicited NAs to
be compliant with the RFC and rename the sysctl knob to
accept_untracked_na.

Fixes: f9a2fb7331 ("net/ipv6: Introduce accept_unsolicited_na knob to implement router-side changes for RFC9131")
Signed-off-by: Arun Ajith S <aajith@arista.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20220530101414.65439-1-aajith@arista.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Arun Ajith S 2022-05-30 10:14:14 +00:00 committed by Paolo Abeni
parent 4a1f14df55
commit 3e0b8f529c
6 changed files with 50 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
Documentation/networking/ip-sysctl.rst
View File

@ -2474,21 +2474,16 @@ drop_unsolicited_na - BOOLEAN
By default this is turned off.
accept_unsolicited_na - BOOLEAN
Add a new neighbour cache entry in STALE state for routers on receiving an
unsolicited neighbour advertisement with target link-layer address option
specified. This is as per router-side behavior documented in RFC9131.
This has lower precedence than drop_unsolicited_na.
accept_untracked_na - BOOLEAN
Add a new neighbour cache entry in STALE state for routers on receiving a
neighbour advertisement (either solicited or unsolicited) with target
link-layer address option specified if no neighbour entry is already
present for the advertised IPv6 address. Without this knob, NAs received
for untracked addresses (absent in neighbour cache) are silently ignored.
==== ====== ====== ==============================================
drop accept fwding behaviour
---- ------ ------ ----------------------------------------------
1 X X Drop NA packet and don't pass up the stack
0 0 X Pass NA packet up the stack, don't update NC
0 1 0 Pass NA packet up the stack, don't update NC
0 1 1 Pass NA packet up the stack, and add a STALE
NC entry
==== ====== ====== ==============================================
This is as per router-side behaviour documented in RFC9131.
This has lower precedence than drop_unsolicited_na.
This will optimize the return path for the initial off-link communication
that is initiated by a directly connected host, by ensuring that

2
include/linux/ipv6.h
View File

@ -61,7 +61,7 @@ struct ipv6_devconf {
__s32 suppress_frag_ndisc;
__s32 accept_ra_mtu;
__s32 drop_unsolicited_na;
__s32 accept_unsolicited_na;
__s32 accept_untracked_na;
struct ipv6_stable_secret {
bool initialized;
struct in6_addr secret;

2
include/uapi/linux/ipv6.h
View File

@ -194,7 +194,7 @@ enum {
DEVCONF_IOAM6_ID,
DEVCONF_IOAM6_ID_WIDE,
DEVCONF_NDISC_EVICT_NOCARRIER,
DEVCONF_ACCEPT_UNSOLICITED_NA,
DEVCONF_ACCEPT_UNTRACKED_NA,
DEVCONF_MAX
};

6
net/ipv6/addrconf.c
View File

@ -5586,7 +5586,7 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier;
array[DEVCONF_ACCEPT_UNSOLICITED_NA] = cnf->accept_unsolicited_na;
array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na;
}
static inline size_t inet6_ifla6_size(void)
@ -7038,8 +7038,8 @@ static const struct ctl_table addrconf_sysctl[] = {
.extra2 = (void *)SYSCTL_ONE,
},
{
.procname = "accept_unsolicited_na",
.data = &ipv6_devconf.accept_unsolicited_na,
.procname = "accept_untracked_na",
.data = &ipv6_devconf.accept_untracked_na,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,

42
net/ipv6/ndisc.c
View File

@ -979,7 +979,7 @@ static void ndisc_recv_na(struct sk_buff *skb)
struct inet6_dev *idev = __in6_dev_get(dev);
struct inet6_ifaddr *ifp;
struct neighbour *neigh;
bool create_neigh;
u8 new_state;
if (skb->len < sizeof(struct nd_msg)) {
ND_PRINTK(2, warn, "NA: packet too short\n");
@ -1000,7 +1000,7 @@ static void ndisc_recv_na(struct sk_buff *skb)
/* For some 802.11 wireless deployments (and possibly other networks),
* there will be a NA proxy and unsolicitd packets are attacks
* and thus should not be accepted.
* drop_unsolicited_na takes precedence over accept_unsolicited_na
* drop_unsolicited_na takes precedence over accept_untracked_na
*/
if (!msg->icmph.icmp6_solicited && idev &&
idev->cnf.drop_unsolicited_na)
@ -1041,25 +1041,33 @@ static void ndisc_recv_na(struct sk_buff *skb)
in6_ifa_put(ifp);
return;
}
neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
/* RFC 9131 updates original Neighbour Discovery RFC 4861.
* An unsolicited NA can now create a neighbour cache entry
* on routers if it has Target LL Address option.
* NAs with Target LL Address option without a corresponding
* entry in the neighbour cache can now create a STALE neighbour
* cache entry on routers.
*
* entry accept fwding solicited behaviour
* ------- ------ ------ --------- ----------------------
* present X X 0 Set state to STALE
* present X X 1 Set state to REACHABLE
* absent 0 X X Do nothing
* absent 1 0 X Do nothing
* absent 1 1 X Add a new STALE entry
*
* drop accept fwding behaviour
* ---- ------ ------ ----------------------------------------------
* 1 X X Drop NA packet and don't pass up the stack
* 0 0 X Pass NA packet up the stack, don't update NC
* 0 1 0 Pass NA packet up the stack, don't update NC
* 0 1 1 Pass NA packet up the stack, and add a STALE
* NC entry
* Note that we don't do a (daddr == all-routers-mcast) check.
*/
create_neigh = !msg->icmph.icmp6_solicited && lladdr &&
idev && idev->cnf.forwarding &&
idev->cnf.accept_unsolicited_na;
neigh = __neigh_lookup(&nd_tbl, &msg->target, dev, create_neigh);
new_state = msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE;
if (!neigh && lladdr &&
idev && idev->cnf.forwarding &&
idev->cnf.accept_untracked_na) {
neigh = neigh_create(&nd_tbl, &msg->target, dev);
new_state = NUD_STALE;
}
if (neigh) {
if (neigh && !IS_ERR(neigh)) {
u8 old_flags = neigh->flags;
struct net *net = dev_net(dev);
@ -1079,7 +1087,7 @@ static void ndisc_recv_na(struct sk_buff *skb)
}
ndisc_update(dev, neigh, lladdr,
msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
new_state,
NEIGH_UPDATE_F_WEAK_OVERRIDE|
(msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
NEIGH_UPDATE_F_OVERRIDE_ISROUTER|

23
tools/testing/selftests/net/ndisc_unsolicited_na_test.sh
View File

@ -1,15 +1,14 @@
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# This test is for the accept_unsolicited_na feature to
# This test is for the accept_untracked_na feature to
# enable RFC9131 behaviour. The following is the test-matrix.
# drop accept fwding behaviour
# ---- ------ ------ ----------------------------------------------
# 1 X X Drop NA packet and don't pass up the stack
# 0 0 X Pass NA packet up the stack, don't update NC
# 0 1 0 Pass NA packet up the stack, don't update NC
# 0 1 1 Pass NA packet up the stack, and add a STALE
# NC entry
# 1 X X Don't update NC
# 0 0 X Don't update NC
# 0 1 0 Don't update NC
# 0 1 1 Add a STALE NC entry
ret=0
# Kselftest framework requirement - SKIP code is 4.
@ -72,7 +71,7 @@ setup()
set -e
local drop_unsolicited_na=$1
local accept_unsolicited_na=$2
local accept_untracked_na=$2
local forwarding=$3
# Setup two namespaces and a veth tunnel across them.
@ -93,7 +92,7 @@ setup()
${IP_ROUTER_EXEC} sysctl -qw \
${ROUTER_CONF}.drop_unsolicited_na=${drop_unsolicited_na}
${IP_ROUTER_EXEC} sysctl -qw \
${ROUTER_CONF}.accept_unsolicited_na=${accept_unsolicited_na}
${ROUTER_CONF}.accept_untracked_na=${accept_untracked_na}
${IP_ROUTER_EXEC} sysctl -qw ${ROUTER_CONF}.disable_ipv6=0
${IP_ROUTER} addr add ${ROUTER_ADDR_WITH_MASK} dev ${ROUTER_INTF}
@ -144,13 +143,13 @@ link_up() {
verify_ndisc() {
local drop_unsolicited_na=$1
local accept_unsolicited_na=$2
local accept_untracked_na=$2
local forwarding=$3
neigh_show_output=$(${IP_ROUTER} neigh show \
to ${HOST_ADDR} dev ${ROUTER_INTF} nud stale)
if [ ${drop_unsolicited_na} -eq 0 ] && \
[ ${accept_unsolicited_na} -eq 1 ] && \
[ ${accept_untracked_na} -eq 1 ] && \
[ ${forwarding} -eq 1 ]; then
# Neighbour entry expected to be present for 011 case
[[ ${neigh_show_output} ]]
@ -179,14 +178,14 @@ test_unsolicited_na_combination() {
test_unsolicited_na_common $1 $2 $3
test_msg=("test_unsolicited_na: "
"drop_unsolicited_na=$1 "
"accept_unsolicited_na=$2 "
"accept_untracked_na=$2 "
"forwarding=$3")
log_test $? 0 "${test_msg[*]}"
cleanup
}
test_unsolicited_na_combinations() {
# Args: drop_unsolicited_na accept_unsolicited_na forwarding
# Args: drop_unsolicited_na accept_untracked_na forwarding
# Expect entry
test_unsolicited_na_combination 0 1 1