diff options
| author | Xin Long <lucien.xin@gmail.com> | 2017-11-07 11:33:08 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-11-10 08:39:53 +0300 |
| commit | dd9d598c6657e2d2eed4497ff2c5d744015201dc (patch) | |
| tree | 620a5a8cca9b60b135df65adeabacd8d53813ca6 /net/ipv4 | |
| parent | c7947e4339b8a3b04f5d90c881f1ce8c05ad8cea (diff) | |
| download | linux-dd9d598c6657e2d2eed4497ff2c5d744015201dc.tar.xz | |
ip_gre: add the support for i/o_flags update via netlink
Now ip_gre is using ip_tunnel_changelink to update it's properties, but
ip_tunnel_changelink in ip_tunnel doesn't update i/o_flags as a common
function.
o_flags updates would cause that tunnel->tun_hlen / hlen and dev->mtu /
needed_headroom need to be recalculated, and dev->(hw_)features need to
be updated as well.
Therefore, we can't just add the update into ip_tunnel_update called
in ip_tunnel_changelink, and it's also better not to touch ip_tunnel
codes.
This patch updates i/o_flags and calls ipgre_link_update to recalculate
these gre properties after ip_tunnel_changelink does the common update.
Note that since ipgre_link_update doesn't know the lower dev, it will
update gre->hlen, dev->mtu and dev->needed_headroom with the value of
'new tun_hlen - old tun_hlen'. In this way, we can avoid many redundant
codes, unlike ip6_gre.
Reported-by: Jianlin Shi <jishi@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/ip_gre.c | 39 |
1 files changed, 37 insertions, 2 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index c105a315b1a3..81e1e20af33b 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -773,6 +773,30 @@ free_skb: return NETDEV_TX_OK; } +static void ipgre_link_update(struct net_device *dev, bool set_mtu) +{ + struct ip_tunnel *tunnel = netdev_priv(dev); + int len; + + len = tunnel->tun_hlen; + tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); + len = tunnel->tun_hlen - len; + tunnel->hlen = tunnel->hlen + len; + + dev->needed_headroom = dev->needed_headroom + len; + if (set_mtu) + dev->mtu = max_t(int, dev->mtu - len, 68); + + if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { + if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || + tunnel->encap.type == TUNNEL_ENCAP_NONE) { + dev->features |= NETIF_F_GSO_SOFTWARE; + dev->hw_features |= NETIF_F_GSO_SOFTWARE; + } + dev->features |= NETIF_F_LLTX; + } +} + static int ipgre_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) { @@ -1307,9 +1331,9 @@ static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], struct netlink_ext_ack *extack) { struct ip_tunnel *t = netdev_priv(dev); - struct ip_tunnel_parm p; struct ip_tunnel_encap ipencap; __u32 fwmark = t->fwmark; + struct ip_tunnel_parm p; int err; if (ipgre_netlink_encap_parms(data, &ipencap)) { @@ -1322,7 +1346,18 @@ static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark); if (err < 0) return err; - return ip_tunnel_changelink(dev, tb, &p, fwmark); + + err = ip_tunnel_changelink(dev, tb, &p, fwmark); + if (err < 0) + return err; + + t->parms.i_flags = p.i_flags; + t->parms.o_flags = p.o_flags; + + if (strcmp(dev->rtnl_link_ops->kind, "erspan")) + ipgre_link_update(dev, !tb[IFLA_MTU]); + + return 0; } static size_t ipgre_get_size(const struct net_device *dev) |