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ipvs: fix dependency on nf_defrag_ipv6 

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@redhat.com>
Signed-off-by: Andrea Claudi <aclaudi@redhat.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Andrea Claudi 2019-02-11 16:14:39 +01:00 committed by Pablo Neira Ayuso
parent 8d29d16d21
commit 098e13f5b2
3 changed files with 15 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
net/netfilter/ipvs/Kconfig
View File

@ -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.

10
net/netfilter/ipvs/ip_vs_core.c
View File

@ -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;
}

10
net/netfilter/ipvs/ip_vs_ctl.c
View File

@ -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