Hello,
On Mon, 11 Feb 2019, Andrea Claudi wrote:
> ipvs relies on nf_defrag_ipv6 module to manage IPv6 fragmentation,
> but lacks proper Kconfig dependencies and does not explicitly
> request defrag features.
>
> As a result, if netfilter hooks are not loaded, when IPv6 fragmented
> packet are handled by ipvs only the first fragment makes through.
>
> Fix it properly declaring the dependency on Kconfig and registering
> netfilter hooks on ip_vs_add_service() and ip_vs_new_dest().
>
> Reported-by: Li Shuang <shuali@xxxxxxxxxx>
> Signed-off-by: Andrea Claudi <aclaudi@xxxxxxxxxx>
Looks good to me, thanks!
Acked-by: Julian Anastasov <ja@xxxxxx>
> ---
> Changes since v1:
> - Move nf_defrag_ipv6_enable() call from __ip_vs_init() to
> ip_vs_new_dest() and ip_vs_add_service() for further optimization.
> ---
> net/netfilter/ipvs/Kconfig | 1 +
> net/netfilter/ipvs/ip_vs_core.c | 10 ++++------
> net/netfilter/ipvs/ip_vs_ctl.c | 10 ++++++++++
> 3 files changed, 15 insertions(+), 6 deletions(-)
>
> diff --git a/net/netfilter/ipvs/Kconfig b/net/netfilter/ipvs/Kconfig
> index cad48d07c818..8401cefd9f65 100644
> --- a/net/netfilter/ipvs/Kconfig
> +++ b/net/netfilter/ipvs/Kconfig
> @@ -29,6 +29,7 @@ config IP_VS_IPV6
> bool "IPv6 support for IPVS"
> depends on IPV6 = y || IP_VS = IPV6
> select IP6_NF_IPTABLES
> + select NF_DEFRAG_IPV6
> ---help---
> Add IPv6 support to IPVS.
>
> diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
> index fe9abf3cc10a..235205c93e14 100644
> --- a/net/netfilter/ipvs/ip_vs_core.c
> +++ b/net/netfilter/ipvs/ip_vs_core.c
> @@ -1536,14 +1536,12 @@ ip_vs_try_to_schedule(struct netns_ipvs *ipvs, int af, struct sk_buff *skb,
> /* sorry, all this trouble for a no-hit :) */
> IP_VS_DBG_PKT(12, af, pp, skb, iph->off,
> "ip_vs_in: packet continues traversal as normal");
> - if (iph->fragoffs) {
> - /* Fragment that couldn't be mapped to a conn entry
> - * is missing module nf_defrag_ipv6
> - */
> - IP_VS_DBG_RL("Unhandled frag, load nf_defrag_ipv6\n");
> +
> + /* Fragment couldn't be mapped to a conn entry */
> + if (iph->fragoffs)
> IP_VS_DBG_PKT(7, af, pp, skb, iph->off,
> "unhandled fragment");
> - }
> +
> *verdict = NF_ACCEPT;
> return 0;
> }
> diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
> index 7d6318664eb2..86afacb07e5f 100644
> --- a/net/netfilter/ipvs/ip_vs_ctl.c
> +++ b/net/netfilter/ipvs/ip_vs_ctl.c
> @@ -43,6 +43,7 @@
> #ifdef CONFIG_IP_VS_IPV6
> #include <net/ipv6.h>
> #include <net/ip6_route.h>
> +#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
> #endif
> #include <net/route.h>
> #include <net/sock.h>
> @@ -895,6 +896,7 @@ ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest,
> {
> struct ip_vs_dest *dest;
> unsigned int atype, i;
> + int ret = 0;
>
> EnterFunction(2);
>
> @@ -905,6 +907,10 @@ ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest,
> atype & IPV6_ADDR_LINKLOCAL) &&
> !__ip_vs_addr_is_local_v6(svc->ipvs->net, &udest->addr.in6))
> return -EINVAL;
> +
> + ret = nf_defrag_ipv6_enable(svc->ipvs->net);
> + if (ret)
> + return ret;
> } else
> #endif
> {
> @@ -1228,6 +1234,10 @@ ip_vs_add_service(struct netns_ipvs *ipvs, struct ip_vs_service_user_kern *u,
> ret = -EINVAL;
> goto out_err;
> }
> +
> + ret = nf_defrag_ipv6_enable(ipvs->net);
> + if (ret)
> + goto out_err;
> }
> #endif
>
> --
> 2.20.1
Regards
--
Julian Anastasov <ja@xxxxxx>
