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net: allow per netns sysctl_rmem and sysctl_wmem for protos

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As we want to gradually implement per netns sysctl_rmem and sysctl_wmem
on per protocol basis, add two new fields in struct proto,
and two new helpers : sk_get_wmem0() and sk_get_rmem0()

First user will be TCP. Then UDP and SCTP can be easily converted,
while DECNET probably wont get this support.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2017-11-07 00:29:27 -08:00
committed by David S. Miller
parent 2ea7a679ca
commit a3dcaf17ee
3 changed files with 29 additions and 5 deletions
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22
include/net/sock.h
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@@ -1101,8 +1101,12 @@ struct proto {
*/
unsigned long *memory_pressure;
long *sysctl_mem;
int *sysctl_wmem;
int *sysctl_rmem;
u32 sysctl_wmem_offset;
u32 sysctl_rmem_offset;
int max_header;
bool no_autobind;
@@ -2390,4 +2394,22 @@ extern int sysctl_optmem_max;
extern __u32 sysctl_wmem_default;
extern __u32 sysctl_rmem_default;
static inline int sk_get_wmem0(const struct sock *sk, const struct proto *proto)
{
/* Does this proto have per netns sysctl_wmem ? */
if (proto->sysctl_wmem_offset)
return *(int *)((void *)sock_net(sk) + proto->sysctl_wmem_offset);
return *proto->sysctl_wmem;
}
static inline int sk_get_rmem0(const struct sock *sk, const struct proto *proto)
{
/* Does this proto have per netns sysctl_rmem ? */
if (proto->sysctl_rmem_offset)
return *(int *)((void *)sock_net(sk) + proto->sysctl_rmem_offset);
return *proto->sysctl_rmem;
}
#endif /* _SOCK_H */