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inet_diag: add support for cgroup filter

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This patch adds ability to filter sockets based on cgroup v2 ID.
Such filter is helpful in ss utility for filtering sockets by
cgroup pathname.

Signed-off-by: Dmitry Yakunin <zeil@yandex-team.ru>
Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Yakunin 2020-04-30 18:51:15 +03:00 committed by David S. Miller
parent 6e3a401fc8
commit b1f3e43dbf
2 changed files with 32 additions and 0 deletions
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1
include/uapi/linux/inet_diag.h
View File

@ -96,6 +96,7 @@ enum {
INET_DIAG_BC_MARK_COND,
INET_DIAG_BC_S_EQ,
INET_DIAG_BC_D_EQ,
INET_DIAG_BC_CGROUP_COND, /* u64 cgroup v2 ID */
};
struct inet_diag_hostcond {

31
net/ipv4/inet_diag.c
View File

@ -43,6 +43,9 @@ struct inet_diag_entry {
u16 userlocks;
u32 ifindex;
u32 mark;
#ifdef CONFIG_SOCK_CGROUP_DATA
u64 cgroup_id;
#endif
};
static DEFINE_MUTEX(inet_diag_table_mutex);
@ -682,6 +685,16 @@ static int inet_diag_bc_run(const struct nlattr *_bc,
yes = 0;
break;
}
#ifdef CONFIG_SOCK_CGROUP_DATA
case INET_DIAG_BC_CGROUP_COND: {
u64 cgroup_id;
cgroup_id = get_unaligned((const u64 *)(op + 1));
if (cgroup_id != entry->cgroup_id)
yes = 0;
break;
}
#endif
}
if (yes) {
@ -732,6 +745,9 @@ int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
else
entry.mark = 0;
#ifdef CONFIG_SOCK_CGROUP_DATA
entry.cgroup_id = cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data));
#endif
return inet_diag_bc_run(bc, &entry);
}
@ -821,6 +837,15 @@ static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
return len >= *min_len;
}
#ifdef CONFIG_SOCK_CGROUP_DATA
static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
int *min_len)
{
*min_len += sizeof(u64);
return len >= *min_len;
}
#endif
static int inet_diag_bc_audit(const struct nlattr *attr,
const struct sk_buff *skb)
{
@ -863,6 +888,12 @@ static int inet_diag_bc_audit(const struct nlattr *attr,
if (!valid_markcond(bc, len, &min_len))
return -EINVAL;
break;
#ifdef CONFIG_SOCK_CGROUP_DATA
case INET_DIAG_BC_CGROUP_COND:
if (!valid_cgroupcond(bc, len, &min_len))
return -EINVAL;
break;
#endif
case INET_DIAG_BC_AUTO:
case INET_DIAG_BC_JMP:
case INET_DIAG_BC_NOP: