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Diffstat (limited to 'net/ipv4/fib_frontend.c')
-rw-r--r--net/ipv4/fib_frontend.c130
1 files changed, 89 insertions, 41 deletions
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 3854411..8732cc7 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -31,6 +31,7 @@
#include <linux/if_addr.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
+#include <linux/cache.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
@@ -85,6 +86,24 @@ struct fib_table *fib_new_table(struct net *net, u32 id)
tb = fib_trie_table(id);
if (!tb)
return NULL;
+
+ switch (id) {
+ case RT_TABLE_LOCAL:
+ net->ipv4.fib_local = tb;
+ break;
+
+ case RT_TABLE_MAIN:
+ net->ipv4.fib_main = tb;
+ break;
+
+ case RT_TABLE_DEFAULT:
+ net->ipv4.fib_default = tb;
+ break;
+
+ default:
+ break;
+ }
+
h = id & (FIB_TABLE_HASHSZ - 1);
hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]);
return tb;
@@ -150,10 +169,6 @@ static inline unsigned int __inet_dev_addr_type(struct net *net,
if (ipv4_is_multicast(addr))
return RTN_MULTICAST;
-#ifdef CONFIG_IP_MULTIPLE_TABLES
- res.r = NULL;
-#endif
-
local_table = fib_get_table(net, RT_TABLE_LOCAL);
if (local_table) {
ret = RTN_UNICAST;
@@ -180,6 +195,44 @@ unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
}
EXPORT_SYMBOL(inet_dev_addr_type);
+__be32 fib_compute_spec_dst(struct sk_buff *skb)
+{
+ struct net_device *dev = skb->dev;
+ struct in_device *in_dev;
+ struct fib_result res;
+ struct rtable *rt;
+ struct flowi4 fl4;
+ struct net *net;
+ int scope;
+
+ rt = skb_rtable(skb);
+ if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) ==
+ RTCF_LOCAL)
+ return ip_hdr(skb)->daddr;
+
+ in_dev = __in_dev_get_rcu(dev);
+ BUG_ON(!in_dev);
+
+ net = dev_net(dev);
+
+ scope = RT_SCOPE_UNIVERSE;
+ if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) {
+ fl4.flowi4_oif = 0;
+ fl4.flowi4_iif = net->loopback_dev->ifindex;
+ fl4.daddr = ip_hdr(skb)->saddr;
+ fl4.saddr = 0;
+ fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
+ fl4.flowi4_scope = scope;
+ fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0;
+ if (!fib_lookup(net, &fl4, &res))
+ return FIB_RES_PREFSRC(net, res);
+ } else {
+ scope = RT_SCOPE_LINK;
+ }
+
+ return inet_select_addr(dev, ip_hdr(skb)->saddr, scope);
+}
+
/* Given (packet source, input interface) and optional (dst, oif, tos):
* - (main) check, that source is valid i.e. not broadcast or our local
* address.
@@ -188,17 +241,15 @@ EXPORT_SYMBOL(inet_dev_addr_type);
* - check, that packet arrived from expected physical interface.
* called with rcu_read_lock()
*/
-int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, u8 tos,
- int oif, struct net_device *dev, __be32 *spec_dst,
- u32 *itag)
+static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
+ u8 tos, int oif, struct net_device *dev,
+ int rpf, struct in_device *idev, u32 *itag)
{
- struct in_device *in_dev;
- struct flowi4 fl4;
+ int ret, no_addr, accept_local;
struct fib_result res;
- int no_addr, rpf, accept_local;
- bool dev_match;
- int ret;
+ struct flowi4 fl4;
struct net *net;
+ bool dev_match;
fl4.flowi4_oif = 0;
fl4.flowi4_iif = oif;
@@ -207,20 +258,10 @@ int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, u8 tos,
fl4.flowi4_tos = tos;
fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
- no_addr = rpf = accept_local = 0;
- in_dev = __in_dev_get_rcu(dev);
- if (in_dev) {
- no_addr = in_dev->ifa_list == NULL;
-
- /* Ignore rp_filter for packets protected by IPsec. */
- rpf = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(in_dev);
-
- accept_local = IN_DEV_ACCEPT_LOCAL(in_dev);
- fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0;
- }
+ no_addr = idev->ifa_list == NULL;
- if (in_dev == NULL)
- goto e_inval;
+ accept_local = IN_DEV_ACCEPT_LOCAL(idev);
+ fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0;
net = dev_net(dev);
if (fib_lookup(net, &fl4, &res))
@@ -229,7 +270,6 @@ int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, u8 tos,
if (res.type != RTN_LOCAL || !accept_local)
goto e_inval;
}
- *spec_dst = FIB_RES_PREFSRC(net, res);
fib_combine_itag(itag, &res);
dev_match = false;
@@ -258,17 +298,14 @@ int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, u8 tos,
ret = 0;
if (fib_lookup(net, &fl4, &res) == 0) {
- if (res.type == RTN_UNICAST) {
- *spec_dst = FIB_RES_PREFSRC(net, res);
+ if (res.type == RTN_UNICAST)
ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
- }
}
return ret;
last_resort:
if (rpf)
goto e_rpf;
- *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
*itag = 0;
return 0;
@@ -278,6 +315,20 @@ e_rpf:
return -EXDEV;
}
+/* Ignore rp_filter for packets protected by IPsec. */
+int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
+ u8 tos, int oif, struct net_device *dev,
+ struct in_device *idev, u32 *itag)
+{
+ int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev);
+
+ if (!r && !fib_num_tclassid_users(dev_net(dev))) {
+ *itag = 0;
+ return 0;
+ }
+ return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag);
+}
+
static inline __be32 sk_extract_addr(struct sockaddr *addr)
{
return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
@@ -879,10 +930,6 @@ static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb)
.flowi4_scope = frn->fl_scope,
};
-#ifdef CONFIG_IP_MULTIPLE_TABLES
- res.r = NULL;
-#endif
-
frn->err = -ENOENT;
if (tb) {
local_bh_disable();
@@ -935,8 +982,11 @@ static void nl_fib_input(struct sk_buff *skb)
static int __net_init nl_fib_lookup_init(struct net *net)
{
struct sock *sk;
- sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0,
- nl_fib_input, NULL, THIS_MODULE);
+ struct netlink_kernel_cfg cfg = {
+ .input = nl_fib_input,
+ };
+
+ sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, THIS_MODULE, &cfg);
if (sk == NULL)
return -EAFNOSUPPORT;
net->ipv4.fibnl = sk;
@@ -1021,11 +1071,6 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
rt_cache_flush(dev_net(dev), 0);
break;
case NETDEV_UNREGISTER_BATCH:
- /* The batch unregister is only called on the first
- * device in the list of devices being unregistered.
- * Therefore we should not pass dev_net(dev) in here.
- */
- rt_cache_flush_batch(NULL);
break;
}
return NOTIFY_DONE;
@@ -1090,6 +1135,9 @@ static int __net_init fib_net_init(struct net *net)
{
int error;
+#ifdef CONFIG_IP_ROUTE_CLASSID
+ net->ipv4.fib_num_tclassid_users = 0;
+#endif
error = ip_fib_net_init(net);
if (error < 0)
goto out;
generated by cgit v0.10.2 at 2024-11-12 02:10:38 (GMT)