1 #ifndef MPLS_INTERNAL_H
2 #define MPLS_INTERNAL_H
5 __be32 label_stack_entry;
8 struct mpls_entry_decoded {
18 struct ctl_table_header *sysctl;
24 #define LABEL_NOT_SPECIFIED (1 << 20)
25 #define MAX_NEW_LABELS 2
27 /* This maximum ha length copied from the definition of struct neighbour */
28 #define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, sizeof(unsigned long)))
30 enum mpls_payload_type {
31 MPT_UNSPEC, /* IPv4 or IPv6 */
35 /* Other types not implemented:
36 * - Pseudo-wire with or without control word (RFC4385)
41 struct mpls_nh { /* next hop label forwarding entry */
42 struct net_device __rcu *nh_dev;
43 u32 nh_label[MAX_NEW_LABELS];
47 u8 nh_via[MAX_VIA_ALEN];
50 struct mpls_route { /* next hop label forwarding entry */
51 struct rcu_head rt_rcu;
55 struct mpls_nh rt_nh[0];
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; \
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; \
70 #define endfor_nexthops(rt) }
72 static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
74 return (struct mpls_shim_hdr *)skb_network_header(skb);
77 static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
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));
88 static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
90 struct mpls_entry_decoded result;
91 unsigned entry = be32_to_cpu(hdr->label_stack_entry);
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;
101 int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels,
103 int nla_get_labels(const struct nlattr *nla, u32 max_labels, u8 *labels,
105 int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
107 bool mpls_output_possible(const struct net_device *dev);
108 unsigned int mpls_dev_mtu(const struct net_device *dev);
109 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
111 #endif /* MPLS_INTERNAL_H */