libnl: /data/src/libnl3/lib/route/nexthop_encap.c Source File

libnl 3.10.0

nexthop_encap.c
1/* SPDX-License-Identifier: LGPL-2.1-only */
2
3#include "nl-default.h"
4
5#include <linux/lwtunnel.h>
6
7#include "nl-route.h"
8#include "nexthop-encap.h"
9
10static struct lwtunnel_encap_type {
11 const char *name;
12 struct nh_encap_ops *ops;
13} lwtunnel_encap_types[__LWTUNNEL_ENCAP_MAX] = {
14 [LWTUNNEL_ENCAP_NONE] = { .name = "none" },
15 [LWTUNNEL_ENCAP_MPLS] = { .name = "mpls", .ops = &mpls_encap_ops },
16 [LWTUNNEL_ENCAP_IP] = { .name = "ip" },
17 [LWTUNNEL_ENCAP_IP6] = { .name = "ip6" },
18 [LWTUNNEL_ENCAP_ILA] = { .name = "ila" },
19 [LWTUNNEL_ENCAP_BPF] = { .name = "bpf" },
20};
21
22static const char *nh_encap_type2str(unsigned int type)
23{
24 const char *name;
25
26 if (type > LWTUNNEL_ENCAP_MAX)
27 return "unknown";
28
29 name = lwtunnel_encap_types[type].name;
30
31 return name ? name : "unknown";
32}
33
34void nh_encap_dump(struct rtnl_nh_encap *rtnh_encap, struct nl_dump_params *dp)
35{
36 if (!rtnh_encap->ops)
37 return;
38
39 nl_dump(dp, " encap %s ",
40 nh_encap_type2str(rtnh_encap->ops->encap_type));
41
42 if (rtnh_encap->ops->dump)
43 rtnh_encap->ops->dump(rtnh_encap->priv, dp);
44}
45
46int nh_encap_build_msg(struct nl_msg *msg, struct rtnl_nh_encap *rtnh_encap)
47{
48 struct nlattr *encap;
49 int err;
50
51 if (!rtnh_encap->ops || !rtnh_encap->ops->build_msg) {
52 NL_DBG(2, "Nexthop encap type not implemented\n");
53 return -NLE_INVAL;
54 }
55
56 NLA_PUT_U16(msg, RTA_ENCAP_TYPE, rtnh_encap->ops->encap_type);
57
58 encap = nla_nest_start(msg, RTA_ENCAP);
59 if (!encap)
60 goto nla_put_failure;
61
62 err = rtnh_encap->ops->build_msg(msg, rtnh_encap->priv);
63 if (err < 0)
64 return err;
65
66 nla_nest_end(msg, encap);
67
68 return 0;
69
70nla_put_failure:
71 return -NLE_MSGSIZE;
72}
73
74int nh_encap_parse_msg(struct nlattr *encap, struct nlattr *encap_type,
75 struct rtnl_nexthop *rtnh)
76{
77 uint16_t e_type = nla_get_u16(encap_type);
78
79 if (e_type == LWTUNNEL_ENCAP_NONE) {
80 NL_DBG(2, "RTA_ENCAP_TYPE should not be LWTUNNEL_ENCAP_NONE\n");
81 return -NLE_INVAL;
82 }
83 if (e_type > LWTUNNEL_ENCAP_MAX) {
84 NL_DBG(2, "Unknown RTA_ENCAP_TYPE: %d\n", e_type);
85 return -NLE_INVAL;
86 }
87
88 if (!lwtunnel_encap_types[e_type].ops) {
89 NL_DBG(2, "RTA_ENCAP_TYPE %s is not implemented\n",
90 lwtunnel_encap_types[e_type].name);
91 return -NLE_MSGTYPE_NOSUPPORT;
92 }
93
94 return lwtunnel_encap_types[e_type].ops->parse_msg(encap, rtnh);
95}
96
97int nh_encap_compare(struct rtnl_nh_encap *a, struct rtnl_nh_encap *b)
98{
99 if (!a && !b)
100 return 0;
101
102 if ((a && !b) || (!a && b) || (a->ops != b->ops))
103 return 1;
104
105 if (!a->ops || !a->ops->compare)
106 return 0;
107
108 return a->ops->compare(a->priv, b->priv);
109}
nla_get_u16
uint16_t nla_get_u16(const struct nlattr *nla)
Return payload of 16 bit integer attribute.
Definition attr.c:662
NLA_PUT_U16
#define NLA_PUT_U16(msg, attrtype, value)
Add 16 bit integer attribute to netlink message.
Definition attr.h:212
nla_nest_start
struct nlattr * nla_nest_start(struct nl_msg *msg, int attrtype)
Start a new level of nested attributes.
Definition attr.c:908
nla_nest_end
int nla_nest_end(struct nl_msg *msg, struct nlattr *start)
Finalize nesting of attributes.
Definition attr.c:971
nl_dump
void nl_dump(struct nl_dump_params *params, const char *fmt,...)
Dump a formatted character string.
Definition utils.c:1015
nh_encap_ops
Definition nexthop-encap.h:4
nl_dump_params
Dumping parameters.
Definition types.h:32
rtnl_nh_encap
Definition nl-route.h:78