136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
#ifndef MPLS_INTERNAL_H
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#define MPLS_INTERNAL_H
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struct mpls_shim_hdr {
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__be32 label_stack_entry;
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};
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struct mpls_entry_decoded {
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u32 label;
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u8 ttl;
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u8 tc;
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u8 bos;
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};
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struct mpls_dev {
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int input_enabled;
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struct ctl_table_header *sysctl;
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struct rcu_head rcu;
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};
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struct sk_buff;
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#define LABEL_NOT_SPECIFIED (1 << 20)
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#define MAX_NEW_LABELS 2
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/* This maximum ha length copied from the definition of struct neighbour */
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#define VIA_ALEN_ALIGN sizeof(unsigned long)
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#define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, VIA_ALEN_ALIGN))
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enum mpls_payload_type {
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MPT_UNSPEC, /* IPv4 or IPv6 */
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MPT_IPV4 = 4,
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MPT_IPV6 = 6,
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/* Other types not implemented:
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* - Pseudo-wire with or without control word (RFC4385)
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* - GAL (RFC5586)
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*/
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};
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struct mpls_nh { /* next hop label forwarding entry */
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struct net_device __rcu *nh_dev;
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unsigned int nh_flags;
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u32 nh_label[MAX_NEW_LABELS];
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u8 nh_labels;
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u8 nh_via_alen;
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u8 nh_via_table;
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};
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/* The route, nexthops and vias are stored together in the same memory
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* block:
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*
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* +----------------------+
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* | mpls_route |
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* +----------------------+
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* | mpls_nh 0 |
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* +----------------------+
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* | ... |
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* +----------------------+
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* | mpls_nh n-1 |
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* +----------------------+
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* | alignment padding |
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* +----------------------+
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* | via[rt_max_alen] 0 |
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* +----------------------+
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* | ... |
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* +----------------------+
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* | via[rt_max_alen] n-1 |
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* +----------------------+
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*/
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struct mpls_route { /* next hop label forwarding entry */
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struct rcu_head rt_rcu;
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u8 rt_protocol;
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u8 rt_payload_type;
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u8 rt_max_alen;
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unsigned int rt_nhn;
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unsigned int rt_nhn_alive;
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struct mpls_nh rt_nh[0];
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};
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#define for_nexthops(rt) { \
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int nhsel; struct mpls_nh *nh; \
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for (nhsel = 0, nh = (rt)->rt_nh; \
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nhsel < (rt)->rt_nhn; \
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nh++, nhsel++)
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#define change_nexthops(rt) { \
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int nhsel; struct mpls_nh *nh; \
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for (nhsel = 0, nh = (struct mpls_nh *)((rt)->rt_nh); \
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nhsel < (rt)->rt_nhn; \
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nh++, nhsel++)
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#define endfor_nexthops(rt) }
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static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
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{
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return (struct mpls_shim_hdr *)skb_network_header(skb);
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}
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static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
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{
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struct mpls_shim_hdr result;
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result.label_stack_entry =
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cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
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(tc << MPLS_LS_TC_SHIFT) |
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(bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
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(ttl << MPLS_LS_TTL_SHIFT));
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return result;
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}
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static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
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{
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struct mpls_entry_decoded result;
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unsigned entry = be32_to_cpu(hdr->label_stack_entry);
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result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
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result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
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result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
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result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
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return result;
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}
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int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels,
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const u32 label[]);
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int nla_get_labels(const struct nlattr *nla, u32 max_labels, u8 *labels,
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u32 label[]);
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int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
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u8 via[]);
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bool mpls_output_possible(const struct net_device *dev);
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unsigned int mpls_dev_mtu(const struct net_device *dev);
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bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
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#endif /* MPLS_INTERNAL_H */
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