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Message-Id: <309974b4d45064b960003cca8b47dec66a0bb540.1675810210.git.lucien.xin@gmail.com>
Date: Tue, 7 Feb 2023 17:52:10 -0500
From: Xin Long <lucien.xin@...il.com>
To: network dev <netdev@...r.kernel.org>, dev@...nvswitch.org
Cc: davem@...emloft.net, kuba@...nel.org,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>,
Pravin B Shelar <pshelar@....org>,
Jamal Hadi Salim <jhs@...atatu.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Jiri Pirko <jiri@...nulli.us>,
Pablo Neira Ayuso <pablo@...filter.org>,
Florian Westphal <fw@...len.de>,
Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
Ilya Maximets <i.maximets@....org>,
Aaron Conole <aconole@...hat.com>
Subject: [PATCHv2 net-next 5/5] net: extract nf_ct_handle_fragments to nf_conntrack_ovs
Now handle_fragments() in OVS and TC have the similar code, and
this patch removes the duplicate code by moving the function
to nf_conntrack_ovs.
Note that skb_clear_hash(skb) or skb->ignore_df = 1 should be
done only when defrag returns 0, as it does in other places
in kernel.
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
include/net/netfilter/nf_conntrack.h | 2 ++
net/netfilter/nf_conntrack_ovs.c | 48 ++++++++++++++++++++++++++++
net/openvswitch/conntrack.c | 45 +-------------------------
net/sched/act_ct.c | 46 ++------------------------
4 files changed, 53 insertions(+), 88 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index a6e89d7212f8..7bbab8f2b73d 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -363,6 +363,8 @@ static inline struct nf_conntrack_net *nf_ct_pernet(const struct net *net)
}
int nf_ct_skb_network_trim(struct sk_buff *skb, int family);
+int nf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
+ u16 zone, u8 family, u8 *proto, u16 *mru);
#define NF_CT_STAT_INC(net, count) __this_cpu_inc((net)->ct.stat->count)
#define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count)
diff --git a/net/netfilter/nf_conntrack_ovs.c b/net/netfilter/nf_conntrack_ovs.c
index c60ef71d1aea..52b776bdf526 100644
--- a/net/netfilter/nf_conntrack_ovs.c
+++ b/net/netfilter/nf_conntrack_ovs.c
@@ -3,6 +3,8 @@
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_seqadj.h>
+#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
+#include <net/ipv6_frag.h>
#include <net/ip.h>
/* 'skb' should already be pulled to nh_ofs. */
@@ -128,3 +130,49 @@ int nf_ct_skb_network_trim(struct sk_buff *skb, int family)
return pskb_trim_rcsum(skb, len);
}
EXPORT_SYMBOL_GPL(nf_ct_skb_network_trim);
+
+/* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
+ * value if 'skb' is freed.
+ */
+int nf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
+ u16 zone, u8 family, u8 *proto, u16 *mru)
+{
+ int err;
+
+ if (family == NFPROTO_IPV4) {
+ enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
+
+ memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
+ local_bh_disable();
+ err = ip_defrag(net, skb, user);
+ local_bh_enable();
+ if (err)
+ return err;
+
+ *mru = IPCB(skb)->frag_max_size;
+#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
+ } else if (family == NFPROTO_IPV6) {
+ enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
+
+ memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
+ err = nf_ct_frag6_gather(net, skb, user);
+ if (err) {
+ if (err != -EINPROGRESS)
+ kfree_skb(skb);
+ return err;
+ }
+
+ *proto = ipv6_hdr(skb)->nexthdr;
+ *mru = IP6CB(skb)->frag_max_size;
+#endif
+ } else {
+ kfree_skb(skb);
+ return -EPFNOSUPPORT;
+ }
+
+ skb_clear_hash(skb);
+ skb->ignore_df = 1;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nf_ct_handle_fragments);
diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 962e2f70e597..5d40ad02cabc 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -434,56 +434,13 @@ static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key,
return 0;
}
-/* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
- * value if 'skb' is freed.
- */
-static int handle_fragments(struct net *net, struct sk_buff *skb,
- u16 zone, u8 family, u8 *proto, u16 *mru)
-{
- int err;
-
- if (family == NFPROTO_IPV4) {
- enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
-
- memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
- err = ip_defrag(net, skb, user);
- if (err)
- return err;
-
- *mru = IPCB(skb)->frag_max_size;
-#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
- } else if (family == NFPROTO_IPV6) {
- enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
-
- memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
- err = nf_ct_frag6_gather(net, skb, user);
- if (err) {
- if (err != -EINPROGRESS)
- kfree_skb(skb);
- return err;
- }
-
- *proto = ipv6_hdr(skb)->nexthdr;
- *mru = IP6CB(skb)->frag_max_size;
-#endif
- } else {
- kfree_skb(skb);
- return -EPFNOSUPPORT;
- }
-
- skb_clear_hash(skb);
- skb->ignore_df = 1;
-
- return 0;
-}
-
static int ovs_ct_handle_fragments(struct net *net, struct sw_flow_key *key,
u16 zone, int family, struct sk_buff *skb)
{
struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
int err;
- err = handle_fragments(net, skb, zone, family, &key->ip.proto, &ovs_cb.mru);
+ err = nf_ct_handle_fragments(net, skb, zone, family, &key->ip.proto, &ovs_cb.mru);
if (err)
return err;
diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index 9f133ed93815..9cc0bc7c71ed 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -778,49 +778,6 @@ static int tcf_ct_ipv6_is_fragment(struct sk_buff *skb, bool *frag)
return 0;
}
-static int handle_fragments(struct net *net, struct sk_buff *skb,
- u16 zone, u8 family, u16 *mru)
-{
- int err;
-
- if (family == NFPROTO_IPV4) {
- enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
-
- memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
- local_bh_disable();
- err = ip_defrag(net, skb, user);
- local_bh_enable();
- if (err && err != -EINPROGRESS)
- return err;
-
- if (!err)
- *mru = IPCB(skb)->frag_max_size;
- } else { /* NFPROTO_IPV6 */
-#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
- enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
-
- memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
- err = nf_ct_frag6_gather(net, skb, user);
- if (err && err != -EINPROGRESS)
- goto out_free;
-
- if (!err)
- *mru = IP6CB(skb)->frag_max_size;
-#else
- err = -EOPNOTSUPP;
- goto out_free;
-#endif
- }
-
- skb_clear_hash(skb);
- skb->ignore_df = 1;
- return err;
-
-out_free:
- kfree_skb(skb);
- return err;
-}
-
static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
u8 family, u16 zone, bool *defrag)
{
@@ -828,6 +785,7 @@ static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
struct nf_conn *ct;
int err = 0;
bool frag;
+ u8 proto;
u16 mru;
/* Previously seen (loopback)? Ignore. */
@@ -843,7 +801,7 @@ static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
return err;
skb_get(skb);
- err = handle_fragments(net, skb, zone, family, &mru);
+ err = nf_ct_handle_fragments(net, skb, zone, family, &proto, &mru);
if (err)
return err;
--
2.31.1
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