diff options
Diffstat (limited to 'target/linux/generic/patches-3.18/080-00-fib_trie-Fix-proc-net-fib_trie-when-CONFIG_IP_MULTIP.patch')
| -rw-r--r-- | target/linux/generic/patches-3.18/080-00-fib_trie-Fix-proc-net-fib_trie-when-CONFIG_IP_MULTIP.patch | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.18/080-00-fib_trie-Fix-proc-net-fib_trie-when-CONFIG_IP_MULTIP.patch b/target/linux/generic/patches-3.18/080-00-fib_trie-Fix-proc-net-fib_trie-when-CONFIG_IP_MULTIP.patch new file mode 100644 index 0000000..5d99367 --- /dev/null +++ b/target/linux/generic/patches-3.18/080-00-fib_trie-Fix-proc-net-fib_trie-when-CONFIG_IP_MULTIP.patch @@ -0,0 +1,46 @@ +From: Alexander Duyck <alexander.h.duyck@redhat.com> +Date: Tue, 2 Dec 2014 10:58:21 -0800 +Subject: [PATCH] fib_trie: Fix /proc/net/fib_trie when + CONFIG_IP_MULTIPLE_TABLES is not defined + +In recent testing I had disabled CONFIG_IP_MULTIPLE_TABLES and as a result +when I ran "cat /proc/net/fib_trie" the main trie was displayed multiple +times. I found that the problem line of code was in the function +fib_trie_seq_next. Specifically the line below caused the indexes to go in +the opposite direction of our traversal: + + h = tb->tb_id & (FIB_TABLE_HASHSZ - 1); + +This issue was that the RT tables are defined such that RT_TABLE_LOCAL is ID +255, while it is located at TABLE_LOCAL_INDEX of 0, and RT_TABLE_MAIN is 254 +with a TABLE_MAIN_INDEX of 1. This means that the above line will return 1 +for the local table and 0 for main. The result is that fib_trie_seq_next +will return NULL at the end of the local table, fib_trie_seq_start will +return the start of the main table, and then fib_trie_seq_next will loop on +main forever as h will always return 0. + +The fix for this is to reverse the ordering of the two tables. It has the +advantage of making it so that the tables now print in the same order +regardless of if multiple tables are enabled or not. In order to make the +definition consistent with the multiple tables case I simply masked the to +RT_TABLE_XXX values by (FIB_TABLE_HASHSZ - 1). This way the two table +layouts should always stay consistent. + +Fixes: 93456b6 ("[IPV4]: Unify access to the routing tables") +Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + +--- a/include/net/ip_fib.h ++++ b/include/net/ip_fib.h +@@ -201,8 +201,8 @@ void fib_free_table(struct fib_table *tb + + #ifndef CONFIG_IP_MULTIPLE_TABLES + +-#define TABLE_LOCAL_INDEX 0 +-#define TABLE_MAIN_INDEX 1 ++#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) ++#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) + + static inline struct fib_table *fib_get_table(struct net *net, u32 id) + { |