Revert "Bluetooth: Store advertising handle so it can be re-enabled"
[platform/kernel/linux-rpi.git] / net / netfilter / nf_nat_bpf.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Unstable NAT Helpers for XDP and TC-BPF hook
3  *
4  * These are called from the XDP and SCHED_CLS BPF programs. Note that it is
5  * allowed to break compatibility for these functions since the interface they
6  * are exposed through to BPF programs is explicitly unstable.
7  */
8
9 #include <linux/bpf.h>
10 #include <linux/btf_ids.h>
11 #include <net/netfilter/nf_conntrack_bpf.h>
12 #include <net/netfilter/nf_conntrack_core.h>
13 #include <net/netfilter/nf_nat.h>
14
15 __diag_push();
16 __diag_ignore_all("-Wmissing-prototypes",
17                   "Global functions as their definitions will be in nf_nat BTF");
18
19 /* bpf_ct_set_nat_info - Set source or destination nat address
20  *
21  * Set source or destination nat address of the newly allocated
22  * nf_conn before insertion. This must be invoked for referenced
23  * PTR_TO_BTF_ID to nf_conn___init.
24  *
25  * Parameters:
26  * @nfct        - Pointer to referenced nf_conn object, obtained using
27  *                bpf_xdp_ct_alloc or bpf_skb_ct_alloc.
28  * @addr        - Nat source/destination address
29  * @port        - Nat source/destination port. Non-positive values are
30  *                interpreted as select a random port.
31  * @manip       - NF_NAT_MANIP_SRC or NF_NAT_MANIP_DST
32  */
33 __bpf_kfunc int bpf_ct_set_nat_info(struct nf_conn___init *nfct,
34                                     union nf_inet_addr *addr, int port,
35                                     enum nf_nat_manip_type manip)
36 {
37         struct nf_conn *ct = (struct nf_conn *)nfct;
38         u16 proto = nf_ct_l3num(ct);
39         struct nf_nat_range2 range;
40
41         if (proto != NFPROTO_IPV4 && proto != NFPROTO_IPV6)
42                 return -EINVAL;
43
44         memset(&range, 0, sizeof(struct nf_nat_range2));
45         range.flags = NF_NAT_RANGE_MAP_IPS;
46         range.min_addr = *addr;
47         range.max_addr = range.min_addr;
48         if (port > 0) {
49                 range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
50                 range.min_proto.all = cpu_to_be16(port);
51                 range.max_proto.all = range.min_proto.all;
52         }
53
54         return nf_nat_setup_info(ct, &range, manip) == NF_DROP ? -ENOMEM : 0;
55 }
56
57 __diag_pop()
58
59 BTF_SET8_START(nf_nat_kfunc_set)
60 BTF_ID_FLAGS(func, bpf_ct_set_nat_info, KF_TRUSTED_ARGS)
61 BTF_SET8_END(nf_nat_kfunc_set)
62
63 static const struct btf_kfunc_id_set nf_bpf_nat_kfunc_set = {
64         .owner = THIS_MODULE,
65         .set   = &nf_nat_kfunc_set,
66 };
67
68 int register_nf_nat_bpf(void)
69 {
70         int ret;
71
72         ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP,
73                                         &nf_bpf_nat_kfunc_set);
74         if (ret)
75                 return ret;
76
77         return register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS,
78                                          &nf_bpf_nat_kfunc_set);
79 }