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net: ipv6: mld: refactor query processing into v1/v2 functions

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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@redhat.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2013-09-04 00:19:42 +02:00 committed by David S. Miller
parent cc7f7ab758
commit 2b7c121f82
1 changed files with 56 additions and 33 deletions
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89
net/ipv6/mcast.c
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@ -1218,6 +1218,55 @@ 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)
{
@ -1229,7 +1278,7 @@ 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;
@ -1255,47 +1304,21 @@ 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)