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BACKPORT: net: bpf: Add netlink and ipv6_route bpf_iter targets

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This patch added netlink and ipv6_route targets, using
the same seq_ops (except show() and minor changes for stop())
for /proc/net/{netlink,ipv6_route}.

The net namespace for these targets are the current net
namespace at file open stage, similar to
/proc/net/{netlink,ipv6_route} reference counting
the net namespace at seq_file open stage.

Since module is not supported for now, ipv6_route is
supported only if the IPV6 is built-in, i.e., not compiled
as a module. The restriction can be lifted once module
is properly supported for bpf_iter.

Change-Id: I07ea2bf9ae25cbca90fd56b70ef6b7bf76fe996d
Signed-off-by: Yonghong Song <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
This commit is contained in:
Yonghong Song 2020-05-09 10:59:10 -07:00 • committed by basamaryan
commit 0b7924ed8b
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GPG key ID: 210D5384FB2A5885
5 changed files with 206 additions and 4 deletions
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86
net/netlink/af_netlink.c
View file

@ -2613,7 +2613,7 @@ static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos)
return __netlink_seq_next(seq);
}
static void netlink_seq_stop(struct seq_file *seq, void *v)
static void netlink_native_seq_stop(struct seq_file *seq, void *v)
{
struct nl_seq_iter *iter = seq->private;
@ -2624,7 +2624,7 @@ static void netlink_seq_stop(struct seq_file *seq, void *v)
}
static int netlink_seq_show(struct seq_file *seq, void *v)
static int netlink_native_seq_show(struct seq_file *seq, void *v)
{
if (v == SEQ_START_TOKEN) {
seq_puts(seq,
@ -2651,6 +2651,68 @@ static int netlink_seq_show(struct seq_file *seq, void *v)
return 0;
}
#ifdef CONFIG_BPF_SYSCALL
struct bpf_iter__netlink {
__bpf_md_ptr(struct bpf_iter_meta *, meta);
__bpf_md_ptr(struct netlink_sock *, sk);
};
DEFINE_BPF_ITER_FUNC(netlink, struct bpf_iter_meta *meta, struct netlink_sock *sk)
static int netlink_prog_seq_show(struct bpf_prog *prog,
struct bpf_iter_meta *meta,
void *v)
{
struct bpf_iter__netlink ctx;
meta->seq_num--; /* skip SEQ_START_TOKEN */
ctx.meta = meta;
ctx.sk = nlk_sk((struct sock *)v);
return bpf_iter_run_prog(prog, &ctx);
}
static int netlink_seq_show(struct seq_file *seq, void *v)
{
struct bpf_iter_meta meta;
struct bpf_prog *prog;
meta.seq = seq;
prog = bpf_iter_get_info(&meta, false);
if (!prog)
return netlink_native_seq_show(seq, v);
if (v != SEQ_START_TOKEN)
return netlink_prog_seq_show(prog, &meta, v);
return 0;
}
static void netlink_seq_stop(struct seq_file *seq, void *v)
{
struct bpf_iter_meta meta;
struct bpf_prog *prog;
if (!v) {
meta.seq = seq;
prog = bpf_iter_get_info(&meta, true);
if (prog)
(void)netlink_prog_seq_show(prog, &meta, v);
}
netlink_native_seq_stop(seq, v);
}
#else
static int netlink_seq_show(struct seq_file *seq, void *v)
{
return netlink_native_seq_show(seq, v);
}
static void netlink_seq_stop(struct seq_file *seq, void *v)
{
netlink_native_seq_stop(seq, v);
}
#endif
static const struct seq_operations netlink_seq_ops = {
.start = netlink_seq_start,
.next = netlink_seq_next,
@ -2757,6 +2819,21 @@ static const struct rhashtable_params netlink_rhashtable_params = {
.automatic_shrinking = true,
};
#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
static int __init bpf_iter_register(void)
{
struct bpf_iter_reg reg_info = {
.target = "netlink",
.seq_ops = &netlink_seq_ops,
.init_seq_private = bpf_iter_init_seq_net,
.fini_seq_private = bpf_iter_fini_seq_net,
.seq_priv_size = sizeof(struct nl_seq_iter),
};
return bpf_iter_reg_target(&reg_info);
}
#endif
static int __init netlink_proto_init(void)
{
int i;
@ -2765,6 +2842,11 @@ static int __init netlink_proto_init(void)
if (err != 0)
goto out;
#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
err = bpf_iter_register();
if (err)
goto out;
#endif
BUILD_BUG_ON(sizeof(struct netlink_skb_parms) > FIELD_SIZEOF(struct sk_buff, cb));
nl_table = kcalloc(MAX_LINKS, sizeof(*nl_table), GFP_KERNEL);