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Date: Mon, 1 Oct 2018 17:28:50 -0700
From: David Ahern <dsahern@...nel.org>
To: netdev@...r.kernel.org, davem@...emloft.net
Cc: christian@...uner.io, jbenc@...hat.com, stephen@...workplumber.org,
David Ahern <dsahern@...il.com>
Subject: [PATCH RFC v2 net-next 24/25] net: Plumb support for filtering ipv4 and ipv6 multicast route dumps
From: David Ahern <dsahern@...il.com>
Implement kernel side filtering of routes by egress device index and
table id.
Signed-off-by: David Ahern <dsahern@...il.com>
---
include/linux/mroute_base.h | 5 +++--
net/ipv4/ipmr.c | 2 +-
net/ipv4/ipmr_base.c | 42 +++++++++++++++++++++++++++++++++++++++++-
net/ipv6/ip6mr.c | 2 +-
4 files changed, 46 insertions(+), 5 deletions(-)
diff --git a/include/linux/mroute_base.h b/include/linux/mroute_base.h
index 6675b9f81979..8fc516c47a64 100644
--- a/include/linux/mroute_base.h
+++ b/include/linux/mroute_base.h
@@ -7,6 +7,7 @@
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/fib_notifier.h>
+#include <net/ip_fib.h>
/**
* struct vif_device - interface representor for multicast routing
@@ -290,7 +291,7 @@ int mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
struct sk_buff *skb,
u32 portid, u32 seq, struct mr_mfc *c,
int cmd, int flags),
- spinlock_t *lock);
+ spinlock_t *lock, struct fib_dump_filter *filter);
int mr_dump(struct net *net, struct notifier_block *nb, unsigned short family,
int (*rules_dump)(struct net *net,
@@ -340,7 +341,7 @@ mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
struct sk_buff *skb,
u32 portid, u32 seq, struct mr_mfc *c,
int cmd, int flags),
- spinlock_t *lock)
+ spinlock_t *lock, struct fib_dump_filter *filter)
{
return -EINVAL;
}
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 9e9ad60dff6b..2fe24009439a 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2538,7 +2538,7 @@ static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
}
return mr_rtm_dumproute(skb, cb, ipmr_mr_table_iter,
- _ipmr_fill_mroute, &mfc_unres_lock);
+ _ipmr_fill_mroute, &mfc_unres_lock, &filter);
}
static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = {
diff --git a/net/ipv4/ipmr_base.c b/net/ipv4/ipmr_base.c
index 1ad9aa62a97b..a4f83cbf033d 100644
--- a/net/ipv4/ipmr_base.c
+++ b/net/ipv4/ipmr_base.c
@@ -268,6 +268,24 @@ int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
}
EXPORT_SYMBOL(mr_fill_mroute);
+static bool mr_mfc_uses_dev(const struct mr_table *mrt,
+ const struct mr_mfc *c,
+ const struct net_device *dev)
+{
+ int ct;
+
+ for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
+ if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
+ const struct vif_device *vif;
+
+ vif = &mrt->vif_table[ct];
+ if (vif->dev == dev)
+ return true;
+ }
+ }
+ return false;
+}
+
int mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
struct mr_table *(*iter)(struct net *net,
struct mr_table *mrt),
@@ -275,17 +293,35 @@ int mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
struct sk_buff *skb,
u32 portid, u32 seq, struct mr_mfc *c,
int cmd, int flags),
- spinlock_t *lock)
+ spinlock_t *lock, struct fib_dump_filter *filter)
{
unsigned int t = 0, e = 0, s_t = cb->args[0], s_e = cb->args[1];
struct net *net = sock_net(skb->sk);
struct mr_table *mrt;
struct mr_mfc *mfc;
+ /* multicast does not use tos or scope, track protocol or have
+ * route type other than RTN_MULTICAST
+ */
+ if (filter->tos || filter->protocol || filter->scope || filter->flags ||
+ (filter->rt_type && filter->rt_type != RTN_MULTICAST))
+ return 0;
+
rcu_read_lock();
+
+ if (filter->ifindex) {
+ filter->dev = dev_get_by_index_rcu(net, filter->ifindex);
+ if (!filter->dev) {
+ rcu_read_unlock();
+ return -ENODEV;
+ }
+ }
+
for (mrt = iter(net, NULL); mrt; mrt = iter(net, mrt)) {
if (t < s_t)
goto next_table;
+ if (filter->table_id && filter->table_id != mrt->id)
+ goto next_table;
list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) {
if (e < s_e)
goto next_entry;
@@ -303,6 +339,10 @@ int mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) {
if (e < s_e)
goto next_entry2;
+ if (filter->dev &&
+ !mr_mfc_uses_dev(mrt, mfc, filter->dev))
+ goto next_entry2;
+
if (fill(mrt, skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, mfc,
RTM_NEWROUTE, NLM_F_MULTI) < 0) {
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index b3084b2c8f88..08e2443ca0cc 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -2444,5 +2444,5 @@ static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
}
return mr_rtm_dumproute(skb, cb, ip6mr_mr_table_iter,
- _ip6mr_fill_mroute, &mfc_unres_lock);
+ _ip6mr_fill_mroute, &mfc_unres_lock, &filter);
}
--
2.11.0
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