Kernel Network Subsystem Patching

[Aruna Hewapathirane <aruna.hewapathirane@xxxxxxxxx>]

Hi,

I am a newbie to kernel hacking and I have a question. Am trying to patch the Network Subsystem and changing the net_random() to direct calls of prandom_u32. Why ? Because it is
harder to audit / grep and new commits actually use prandom_u32 only am told.

u32 prandom_u32(void);    /* defined in include/linux/random.h: */

#define net_random()        prandom_u32() /* defined in include/linux/net.h */

Everything works as expected until I get to net/core/neighbour.c and then patch fails to apply.

The diff is here:

-------------------------------------------------------------------------------------------------------------------------------
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 47d834e..ea97361 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -117,7 +117,7 @@ static void neigh_cleanup_and_release(struct neighbour *neig
 
 unsigned long neigh_rand_reach_time(unsigned long base)
 {
-       return base ? (prandom_u32() % base) + (base >> 1) : 0;
+       return base ? (net_random() % base) + (base >> 1) : 0;
 }
 EXPORT_SYMBOL(neigh_rand_reach_time);
 
@@ -1415,7 +1415,7 @@ void pneigh_enqueue(struct neigh_table *tbl, struct neigh_
                    struct sk_buff *skb)
 {
        unsigned long now = jiffies;
-       unsigned long sched_next = now + (prandom_u32() %
+       unsigned long sched_next = now + (net_random() %
                                          NEIGH_VAR(p, PROXY_DELAY));
 
        if (tbl->proxy_queue.qlen > NEIGH_VAR(p, PROXY_QLEN)) {
-------------------------------------------------------------------------------------------------------------------------------

I can use some help and guidance please, what am I doing wrong ? Or not seeing ? It's just this neighbor.c file that is doing this and I am stumped.

Thank you.

Aruna Hewapathirane

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