[PATCH net 0/2] GTP tunnel driver fixes
Hi, The following patchset contains two fixes for the GTP tunnel driver: 1) Incorrect GTPA_MAX definition in UAPI headers. This is updating an existing UAPI definition but for a good reason, this is certainly broken. Similar fixes for incorrect _MAX definition in netlink headers were applied in the past too. 2) Fix GTP driver PMTU with GRO packets, add missing call to skb_gso_validate_network_len() to handle GRO packets. Please apply, Thanks. Pablo Neira Ayuso (2): gtp: uapi: fix GTPA_MAX gtp: fix fragmentation needed check with gso drivers/net/gtp.c | 5 +++-- include/uapi/linux/gtp.h | 2 +- 2 files changed, 4 insertions(+), 3 deletions(-) -- 2.30.2
Subtract one to __GTPA_MAX, otherwise GTPA_MAX is off by 2. Fixes: 459aa660eb1d ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> --- include/uapi/linux/gtp.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/uapi/linux/gtp.h b/include/uapi/linux/gtp.h index 2f61298a7b77..3dcdb9e33cba 100644 --- a/include/uapi/linux/gtp.h +++ b/include/uapi/linux/gtp.h @@ -33,6 +33,6 @@ enum gtp_attrs { GTPA_PAD, __GTPA_MAX, }; -#define GTPA_MAX (__GTPA_MAX + 1) +#define GTPA_MAX (__GTPA_MAX - 1) #endif /* _UAPI_LINUX_GTP_H_ */ -- 2.30.2
Call skb_gso_validate_network_len() to check if packet is over PMTU. Fixes: 459aa660eb1d ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> --- drivers/net/gtp.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c index 144ec626230d..b22596b18ee8 100644 --- a/drivers/net/gtp.c +++ b/drivers/net/gtp.c @@ -872,8 +872,9 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, skb_dst_update_pmtu_no_confirm(skb, mtu); - if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) && - mtu < ntohs(iph->tot_len)) { + if (iph->frag_off & htons(IP_DF) && + ((!skb_is_gso(skb) && skb->len > mtu) || + (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu)))) { netdev_dbg(dev, "packet too big, fragmentation needed\n"); icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); -- 2.30.2
Hello: This series was applied to netdev/net.git (main) by Paolo Abeni <pabeni@redhat.com>: On Sun, 22 Oct 2023 22:25:16 +0200 you wrote:
Hi,
The following patchset contains two fixes for the GTP tunnel driver:
1) Incorrect GTPA_MAX definition in UAPI headers. This is updating an existing UAPI definition but for a good reason, this is certainly broken. Similar fixes for incorrect _MAX definition in netlink headers were applied in the past too.
[...]
Here is the summary with links: - [net,1/2] gtp: uapi: fix GTPA_MAX https://git.kernel.org/netdev/net/c/adc8df12d91a - [net,2/2] gtp: fix fragmentation needed check with gso https://git.kernel.org/netdev/net/c/4530e5b8e2da You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
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Pablo Neira Ayuso -
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