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Add support for PIO p flag
draft-ietf-6man-pio-pflag is adding a new flag to the Prefix Information Option to signal that the network can allocate a unique IPv6 prefix per client via DHCPv6-PD (see draft-ietf-v6ops-dhcp-pd-per-device). When ra_honor_pio_pflag is enabled, the presence of a P-flag causes SLAAC autoconfiguration to be disabled for that particular PIO. An automated test has been added in Android (r.android.com/3195335) to go along with this change. Cc: Maciej Żenczykowski <maze@google.com> Cc: Lorenzo Colitti <lorenzo@google.com> Cc: David Lamparter <equinox@opensourcerouting.org> Cc: Simon Horman <horms@kernel.org> Signed-off-by: Patrick Rohr <prohr@google.com> Reviewed-by: Maciej Żenczykowski <maze@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -2362,6 +2362,20 @@ ra_honor_pio_life - BOOLEAN
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Default: 0 (disabled)
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ra_honor_pio_pflag - BOOLEAN
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The Prefix Information Option P-flag indicates the network can
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allocate a unique IPv6 prefix per client using DHCPv6-PD.
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This sysctl can be enabled when a userspace DHCPv6-PD client
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is running to cause the P-flag to take effect: i.e. the
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P-flag suppresses any effects of the A-flag within the same
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PIO. For a given PIO, P=1 and A=1 is treated as A=0.
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- If disabled, the P-flag is ignored.
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- If enabled, the P-flag will disable SLAAC autoconfiguration
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for the given Prefix Information Option.
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Default: 0 (disabled)
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accept_ra_rt_info_min_plen - INTEGER
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Minimum prefix length of Route Information in RA.
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@ -89,6 +89,7 @@ struct ipv6_devconf {
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__u8 ioam6_enabled;
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__u8 ndisc_evict_nocarrier;
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__u8 ra_honor_pio_life;
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__u8 ra_honor_pio_pflag;
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struct ctl_table_header *sysctl_header;
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};
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@ -37,10 +37,14 @@ struct prefix_info {
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struct __packed {
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#if defined(__BIG_ENDIAN_BITFIELD)
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__u8 onlink : 1,
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autoconf : 1,
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reserved : 6;
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autoconf : 1,
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routeraddr : 1,
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preferpd : 1,
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reserved : 4;
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#elif defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 reserved : 6,
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__u8 reserved : 4,
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preferpd : 1,
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routeraddr : 1,
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autoconf : 1,
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onlink : 1;
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#else
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@ -239,6 +239,7 @@ static struct ipv6_devconf ipv6_devconf __read_mostly = {
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.ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
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.ndisc_evict_nocarrier = 1,
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.ra_honor_pio_life = 0,
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.ra_honor_pio_pflag = 0,
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};
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static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
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@ -302,6 +303,7 @@ static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
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.ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
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.ndisc_evict_nocarrier = 1,
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.ra_honor_pio_life = 0,
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.ra_honor_pio_pflag = 0,
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};
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/* Check if link is ready: is it up and is a valid qdisc available */
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@ -2762,6 +2764,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
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u32 addr_flags = 0;
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struct inet6_dev *in6_dev;
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struct net *net = dev_net(dev);
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bool ignore_autoconf = false;
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pinfo = (struct prefix_info *) opt;
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@ -2864,7 +2867,8 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
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/* Try to figure out our local address for this prefix */
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if (pinfo->autoconf && in6_dev->cnf.autoconf) {
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ignore_autoconf = READ_ONCE(in6_dev->cnf.ra_honor_pio_pflag) && pinfo->preferpd;
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if (pinfo->autoconf && in6_dev->cnf.autoconf && !ignore_autoconf) {
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struct in6_addr addr;
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bool tokenized = false, dev_addr_generated = false;
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@ -6926,6 +6930,15 @@ static const struct ctl_table addrconf_sysctl[] = {
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_ONE,
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},
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{
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.procname = "ra_honor_pio_pflag",
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.data = &ipv6_devconf.ra_honor_pio_pflag,
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.maxlen = sizeof(u8),
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.mode = 0644,
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.proc_handler = proc_dou8vec_minmax,
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_ONE,
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},
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#ifdef CONFIG_IPV6_ROUTER_PREF
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{
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.procname = "accept_ra_rtr_pref",
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