[PATCH net-next 2/2] Bonding: force user to add HWTSTAMP_FLAGS_UNSTABLE_PHC when get/set HWTSTAMP
flat view
STALE1789d
From: Hangbin Liu <hidden>
Date: 2021-12-08 04:43:38
Subsystem:
bonding driver, networking drivers, the rest · Maintainers:
Jay Vosburgh, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
When there is a failover, the PHC index of bond active interface will change. This may break the user space program if the author didn't aware. By setting this flag, the user should aware that the PHC index get/set by syscall is not stable. And the user space is able to deal with it. Without this flag, the kernel will reject the request forwarding to bonding. Reported-by: Jakub Kicinski <kuba@kernel.org> Fixes: 94dd016ae538 ("bond: pass get_ts_info and SIOC[SG]HWTSTAMP ioctl to active device") Signed-off-by: Hangbin Liu <redacted> --- drivers/net/bonding/bond_main.c | 33 +++++++++++++++++++++------------ 1 file changed, 21 insertions(+), 12 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 0f39ad2af81c..196fec74944b 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c@@ -4094,6 +4094,7 @@ static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cm struct mii_ioctl_data *mii = NULL; const struct net_device_ops *ops; struct net_device *real_dev; + struct hwtstamp_config cfg; struct ifreq ifrr; int res = 0;
@@ -4124,21 +4125,29 @@ static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cm break; case SIOCSHWTSTAMP: case SIOCGHWTSTAMP: - rcu_read_lock(); - real_dev = bond_option_active_slave_get_rcu(bond); - rcu_read_unlock(); - if (real_dev) { - strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); - ifrr.ifr_ifru = ifr->ifr_ifru; + if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) + return -EFAULT; + + if (cfg.flags & HWTSTAMP_FLAGS_UNSTABLE_PHC) { + rcu_read_lock(); + real_dev = bond_option_active_slave_get_rcu(bond); + rcu_read_unlock(); + if (real_dev) { + strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); + ifrr.ifr_ifru = ifr->ifr_ifru; + + ops = real_dev->netdev_ops; + if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) { + res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); - ops = real_dev->netdev_ops; - if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) - res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); + if (!res) + ifr->ifr_ifru = ifrr.ifr_ifru; - if (!res) - ifr->ifr_ifru = ifrr.ifr_ifru; + return res; + } + } } - break; + fallthrough; default: res = -EOPNOTSUPP; }
--
2.31.1