blob: d7757be39877e84530ebecfc18fbb7dab502f979 [file] [log] [blame]
Eric W. Biederman01891972015-03-03 19:10:47 -06001#ifndef MPLS_INTERNAL_H
2#define MPLS_INTERNAL_H
3
Eric W. Biederman01891972015-03-03 19:10:47 -06004struct mpls_shim_hdr {
5 __be32 label_stack_entry;
6};
7
8struct mpls_entry_decoded {
9 u32 label;
10 u8 ttl;
11 u8 tc;
12 u8 bos;
13};
14
Robert Shearman03c57742015-04-22 11:14:37 +010015struct mpls_dev {
Robert Shearman37bde792015-04-22 11:14:38 +010016 int input_enabled;
17
18 struct ctl_table_header *sysctl;
Robert Shearman25cc8f02015-06-05 18:54:45 +010019 struct rcu_head rcu;
Robert Shearman03c57742015-04-22 11:14:37 +010020};
21
Eric W. Biederman01891972015-03-03 19:10:47 -060022struct sk_buff;
23
Roopa Prabhuf8efb732015-10-23 06:03:27 -070024#define LABEL_NOT_SPECIFIED (1 << 20)
25#define MAX_NEW_LABELS 2
26
27/* This maximum ha length copied from the definition of struct neighbour */
28#define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, sizeof(unsigned long)))
29
30enum mpls_payload_type {
31 MPT_UNSPEC, /* IPv4 or IPv6 */
32 MPT_IPV4 = 4,
33 MPT_IPV6 = 6,
34
35 /* Other types not implemented:
36 * - Pseudo-wire with or without control word (RFC4385)
37 * - GAL (RFC5586)
38 */
39};
40
41struct mpls_nh { /* next hop label forwarding entry */
42 struct net_device __rcu *nh_dev;
43 u32 nh_label[MAX_NEW_LABELS];
44 u8 nh_labels;
45 u8 nh_via_alen;
46 u8 nh_via_table;
47 u8 nh_via[MAX_VIA_ALEN];
48};
49
50struct mpls_route { /* next hop label forwarding entry */
51 struct rcu_head rt_rcu;
52 u8 rt_protocol;
53 u8 rt_payload_type;
54 int rt_nhn;
55 struct mpls_nh rt_nh[0];
56};
57
58#define for_nexthops(rt) { \
59 int nhsel; struct mpls_nh *nh; \
60 for (nhsel = 0, nh = (rt)->rt_nh; \
61 nhsel < (rt)->rt_nhn; \
62 nh++, nhsel++)
63
64#define change_nexthops(rt) { \
65 int nhsel; struct mpls_nh *nh; \
66 for (nhsel = 0, nh = (struct mpls_nh *)((rt)->rt_nh); \
67 nhsel < (rt)->rt_nhn; \
68 nh++, nhsel++)
69
70#define endfor_nexthops(rt) }
71
Eric W. Biederman01891972015-03-03 19:10:47 -060072static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
73{
74 return (struct mpls_shim_hdr *)skb_network_header(skb);
75}
76
77static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
78{
79 struct mpls_shim_hdr result;
80 result.label_stack_entry =
81 cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
82 (tc << MPLS_LS_TC_SHIFT) |
83 (bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
84 (ttl << MPLS_LS_TTL_SHIFT));
85 return result;
86}
87
88static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
89{
90 struct mpls_entry_decoded result;
91 unsigned entry = be32_to_cpu(hdr->label_stack_entry);
92
93 result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
94 result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
95 result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
96 result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
97
98 return result;
99}
100
Roopa Prabhuface0182015-07-21 10:43:52 +0200101int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels,
102 const u32 label[]);
Roopa Prabhuf8efb732015-10-23 06:03:27 -0700103int nla_get_labels(const struct nlattr *nla, u32 max_labels, u8 *labels,
Roopa Prabhuface0182015-07-21 10:43:52 +0200104 u32 label[]);
Roopa Prabhuf8efb732015-10-23 06:03:27 -0700105int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
106 u8 via[]);
Roopa Prabhuface0182015-07-21 10:43:52 +0200107bool mpls_output_possible(const struct net_device *dev);
108unsigned int mpls_dev_mtu(const struct net_device *dev);
109bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
Eric W. Biederman966bae32015-03-03 19:13:19 -0600110
Eric W. Biederman01891972015-03-03 19:10:47 -0600111#endif /* MPLS_INTERNAL_H */