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 VIA_ALEN_ALIGN sizeof(unsigned long)
29 #define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, VIA_ALEN_ALIGN))
31 enum mpls_payload_type {
32 MPT_UNSPEC, /* IPv4 or IPv6 */
36 /* Other types not implemented:
37 * - Pseudo-wire with or without control word (RFC4385)
42 struct mpls_nh { /* next hop label forwarding entry */
43 struct net_device __rcu *nh_dev;
44 u32 nh_label[MAX_NEW_LABELS];
50 /* The route, nexthops and vias are stored together in the same memory
53 * +----------------------+
55 * +----------------------+
57 * +----------------------+
59 * +----------------------+
61 * +----------------------+
62 * | alignment padding |
63 * +----------------------+
64 * | via[rt_max_alen] 0 |
65 * +----------------------+
67 * +----------------------+
68 * | via[rt_max_alen] n-1 |
69 * +----------------------+
71 struct mpls_route { /* next hop label forwarding entry */
72 struct rcu_head rt_rcu;
77 struct mpls_nh rt_nh[0];
80 #define for_nexthops(rt) { \
81 int nhsel; struct mpls_nh *nh; \
82 for (nhsel = 0, nh = (rt)->rt_nh; \
83 nhsel < (rt)->rt_nhn; \
86 #define change_nexthops(rt) { \
87 int nhsel; struct mpls_nh *nh; \
88 for (nhsel = 0, nh = (struct mpls_nh *)((rt)->rt_nh); \
89 nhsel < (rt)->rt_nhn; \
92 #define endfor_nexthops(rt) }
94 static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
96 return (struct mpls_shim_hdr *)skb_network_header(skb);
99 static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
101 struct mpls_shim_hdr result;
102 result.label_stack_entry =
103 cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
104 (tc << MPLS_LS_TC_SHIFT) |
105 (bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
106 (ttl << MPLS_LS_TTL_SHIFT));
110 static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
112 struct mpls_entry_decoded result;
113 unsigned entry = be32_to_cpu(hdr->label_stack_entry);
115 result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
116 result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
117 result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
118 result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
123 int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels,
125 int nla_get_labels(const struct nlattr *nla, u32 max_labels, u8 *labels,
127 int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
129 bool mpls_output_possible(const struct net_device *dev);
130 unsigned int mpls_dev_mtu(const struct net_device *dev);
131 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
133 #endif /* MPLS_INTERNAL_H */