From b7f14132bf58256e841774ae07d3ffb7a841c2bc Mon Sep 17 00:00:00 2001 From: Hangbin Liu Date: Tue, 30 Aug 2022 17:37:20 +0800 Subject: bonding: use unspecified address if no available link local address When ns_ip6_target was set, the ipv6_dev_get_saddr() will be called to get available source address and send IPv6 neighbor solicit message. If the target is global address, ipv6_dev_get_saddr() will get any available src address. But if the target is link local address, ipv6_dev_get_saddr() will only get available address from our interface, i.e. the corresponding bond interface. But before bond interface up, all the address is tentative, while ipv6_dev_get_saddr() will ignore tentative address. This makes we can't find available link local src address, then bond_ns_send() will not be called and no NS message was sent. Finally bond interface will keep in down state. Fix this by sending NS with unspecified address if there is no available source address. Reported-by: LiLiang Fixes: 5e1eeef69c0f ("bonding: NS target should accept link local address") Signed-off-by: Hangbin Liu Signed-off-by: David S. Miller --- drivers/net/bonding/bond_main.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/net/bonding') diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 2f4da2c13c0a..531c7465bc51 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -3167,6 +3167,9 @@ static void bond_ns_send_all(struct bonding *bond, struct slave *slave) found: if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr)) bond_ns_send(slave, &targets[i], &saddr, tags); + else + bond_ns_send(slave, &targets[i], &in6addr_any, tags); + dst_release(dst); kfree(tags); } -- cgit v1.2.3 From 592335a4164c3c41f57967223a1e1efe3a0c6eb3 Mon Sep 17 00:00:00 2001 From: Hangbin Liu Date: Tue, 30 Aug 2022 17:37:22 +0800 Subject: bonding: accept unsolicited NA message The unsolicited NA message with all-nodes multicast dest address should be valid, as this also means the link could reach the target. Also rename bond_validate_ns() to bond_validate_na(). Reported-by: LiLiang Fixes: 5e1eeef69c0f ("bonding: NS target should accept link local address") Signed-off-by: Hangbin Liu Signed-off-by: David S. Miller --- drivers/net/bonding/bond_main.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) (limited to 'drivers/net/bonding') diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 531c7465bc51..5c2febe94428 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -3201,12 +3201,19 @@ static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr) return ret; } -static void bond_validate_ns(struct bonding *bond, struct slave *slave, +static void bond_validate_na(struct bonding *bond, struct slave *slave, struct in6_addr *saddr, struct in6_addr *daddr) { int i; - if (ipv6_addr_any(saddr) || !bond_has_this_ip6(bond, daddr)) { + /* Ignore NAs that: + * 1. Source address is unspecified address. + * 2. Dest address is neither all-nodes multicast address nor + * exist on bond interface. + */ + if (ipv6_addr_any(saddr) || + (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) && + !bond_has_this_ip6(bond, daddr))) { slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n", __func__, saddr, daddr); return; @@ -3249,14 +3256,14 @@ static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond, * see bond_arp_rcv(). */ if (bond_is_active_slave(slave)) - bond_validate_ns(bond, slave, saddr, daddr); + bond_validate_na(bond, slave, saddr, daddr); else if (curr_active_slave && time_after(slave_last_rx(bond, curr_active_slave), curr_active_slave->last_link_up)) - bond_validate_ns(bond, slave, saddr, daddr); + bond_validate_na(bond, slave, saddr, daddr); else if (curr_arp_slave && bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) - bond_validate_ns(bond, slave, saddr, daddr); + bond_validate_na(bond, slave, saddr, daddr); out: return RX_HANDLER_ANOTHER; -- cgit v1.2.3