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Date: Tue, 3 Sep 2013 09:59:36 +0200
From: Daniel Borkmann <dborkman@...hat.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: [PATCH net-next 6/8] net: ipv6: mld: refactor query processing into v1/v2 functions
Make igmp6_event_query() a bit easier to read by refactoring code
parts into mld_process_v1() and mld_process_v2().
Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
net/ipv6/mcast.c | 89 +++++++++++++++++++++++++++++++++++---------------------
1 file changed, 56 insertions(+), 33 deletions(-)
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 75a4324..b01aa32 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -1207,6 +1207,55 @@ static void mld_update_qri(struct inet6_dev *idev,
idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
}
+static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
+ unsigned long *max_delay)
+{
+ unsigned long mldv1_md;
+
+ /* Ignore v1 queries */
+ if (mld_in_v2_mode_only(idev))
+ return -EINVAL;
+
+ /* MLDv1 router present */
+ mldv1_md = ntohs(mld->mld_maxdelay);
+ *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
+
+ mld_set_v1_mode(idev);
+
+ /* cancel MLDv2 report timer */
+ idev->mc_gq_running = 0;
+ if (del_timer(&idev->mc_gq_timer))
+ __in6_dev_put(idev);
+
+ /* cancel the interface change timer */
+ idev->mc_ifc_count = 0;
+ if (del_timer(&idev->mc_ifc_timer))
+ __in6_dev_put(idev);
+
+ /* clear deleted report items */
+ mld_clear_delrec(idev);
+
+ return 0;
+}
+
+static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
+ unsigned long *max_delay)
+{
+ /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
+ if (mld_in_v1_mode(idev))
+ return -EINVAL;
+
+ *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
+
+ mld_update_qrv(idev, mld);
+ mld_update_qi(idev, mld);
+ mld_update_qri(idev, mld);
+
+ idev->mc_maxdelay = *max_delay;
+
+ return 0;
+}
+
/* called with rcu_read_lock() */
int igmp6_event_query(struct sk_buff *skb)
{
@@ -1218,7 +1267,7 @@ int igmp6_event_query(struct sk_buff *skb)
struct mld_msg *mld;
int group_type;
int mark = 0;
- int len;
+ int len, err;
if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
return -EINVAL;
@@ -1244,47 +1293,21 @@ int igmp6_event_query(struct sk_buff *skb)
return -EINVAL;
if (len == MLD_V1_QUERY_LEN) {
- unsigned long mldv1_md;
-
- /* Ignore v1 queries */
- if (mld_in_v2_mode_only(idev))
- return 0;
-
- /* MLDv1 router present */
- mldv1_md = ntohs(mld->mld_maxdelay);
- max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
-
- mld_set_v1_mode(idev);
-
- /* cancel MLDv2 report timer */
- idev->mc_gq_running = 0;
- if (del_timer(&idev->mc_gq_timer))
- __in6_dev_put(idev);
-
- /* cancel the interface change timer */
- idev->mc_ifc_count = 0;
- if (del_timer(&idev->mc_ifc_timer))
- __in6_dev_put(idev);
- /* clear deleted report items */
- mld_clear_delrec(idev);
+ err = mld_process_v1(idev, mld, &max_delay);
+ if (err < 0)
+ return err;
} else if (len >= MLD_V2_QUERY_LEN_MIN) {
int srcs_offset = sizeof(struct mld2_query) -
sizeof(struct icmp6hdr);
- /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
- if (mld_in_v1_mode(idev))
- return 0;
if (!pskb_may_pull(skb, srcs_offset))
return -EINVAL;
mlh2 = (struct mld2_query *)skb_transport_header(skb);
- max_delay = max(msecs_to_jiffies(mldv2_mrc(mlh2)), 1UL);
- idev->mc_maxdelay = max_delay;
-
- mld_update_qrv(idev, mlh2);
- mld_update_qi(idev, mlh2);
- mld_update_qri(idev, mlh2);
+ err = mld_process_v2(idev, mlh2, &max_delay);
+ if (err < 0)
+ return err;
if (group_type == IPV6_ADDR_ANY) { /* general query */
if (mlh2->mld2q_nsrcs)
--
1.7.11.7
--
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