From: Hangbin Liu <liuhangbin@xxxxxxxxx>
[ Upstream commit 4d633d1b468b6eb107a81b2fd10b9debddca3d47 ]
Currently, we get icmp6hdr via function icmp6_hdr(), which needs the skb
transport header to be set first. But there is no rule to ask driver set
transport header before netif_receive_skb() and bond_handle_frame(). So
we will not able to get correct icmp6hdr on some drivers.
Fix this by using skb_header_pointer to get the IPv6 and ICMPV6 headers.
Reported-by: Liang Li <liali@xxxxxxxxxx>
Fixes: 4e24be018eb9 ("bonding: add new parameter ns_targets")
Suggested-by: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Signed-off-by: Hangbin Liu <liuhangbin@xxxxxxxxx>
Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Acked-by: Jay Vosburgh <jay.vosburgh@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221118034353.1736727-1-liuhangbin@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/bonding/bond_main.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 86d42306aa5e..76dd5ff1d99d 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3231,16 +3231,23 @@ static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond,
struct slave *slave)
{
struct slave *curr_active_slave, *curr_arp_slave;
- struct icmp6hdr *hdr = icmp6_hdr(skb);
struct in6_addr *saddr, *daddr;
+ struct {
+ struct ipv6hdr ip6;
+ struct icmp6hdr icmp6;
+ } *combined, _combined;
if (skb->pkt_type == PACKET_OTHERHOST ||
- skb->pkt_type == PACKET_LOOPBACK ||
- hdr->icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT)
+ skb->pkt_type == PACKET_LOOPBACK)
+ goto out;
+
+ combined = skb_header_pointer(skb, 0, sizeof(_combined), &_combined);
+ if (!combined || combined->ip6.nexthdr != NEXTHDR_ICMP ||
+ combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT)
goto out;
- saddr = &ipv6_hdr(skb)->saddr;
- daddr = &ipv6_hdr(skb)->daddr;
+ saddr = &combined->ip6.saddr;
+ daddr = &combined->ip6.saddr;
slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n",
__func__, slave->dev->name, bond_slave_state(slave),
--
2.35.1
