1 #ifndef MPLS_INTERNAL_H 2 #define MPLS_INTERNAL_H 3 #include <net/mpls.h> 4 5 struct mpls_entry_decoded { 6 u32 label; 7 u8 ttl; 8 u8 tc; 9 u8 bos; 10 }; 11 12 struct mpls_dev { 13 int input_enabled; 14 15 struct ctl_table_header *sysctl; 16 struct rcu_head rcu; 17 }; 18 19 struct sk_buff; 20 21 #define LABEL_NOT_SPECIFIED (1 << 20) 22 #define MAX_NEW_LABELS 2 23 24 /* This maximum ha length copied from the definition of struct neighbour */ 25 #define VIA_ALEN_ALIGN sizeof(unsigned long) 26 #define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, VIA_ALEN_ALIGN)) 27 28 enum mpls_payload_type { 29 MPT_UNSPEC, /* IPv4 or IPv6 */ 30 MPT_IPV4 = 4, 31 MPT_IPV6 = 6, 32 33 /* Other types not implemented: 34 * - Pseudo-wire with or without control word (RFC4385) 35 * - GAL (RFC5586) 36 */ 37 }; 38 39 struct mpls_nh { /* next hop label forwarding entry */ 40 struct net_device __rcu *nh_dev; 41 unsigned int nh_flags; 42 u32 nh_label[MAX_NEW_LABELS]; 43 u8 nh_labels; 44 u8 nh_via_alen; 45 u8 nh_via_table; 46 }; 47 48 /* The route, nexthops and vias are stored together in the same memory 49 * block: 50 * 51 * +----------------------+ 52 * | mpls_route | 53 * +----------------------+ 54 * | mpls_nh 0 | 55 * +----------------------+ 56 * | ... | 57 * +----------------------+ 58 * | mpls_nh n-1 | 59 * +----------------------+ 60 * | alignment padding | 61 * +----------------------+ 62 * | via[rt_max_alen] 0 | 63 * +----------------------+ 64 * | ... | 65 * +----------------------+ 66 * | via[rt_max_alen] n-1 | 67 * +----------------------+ 68 */ 69 struct mpls_route { /* next hop label forwarding entry */ 70 struct rcu_head rt_rcu; 71 u8 rt_protocol; 72 u8 rt_payload_type; 73 u8 rt_max_alen; 74 unsigned int rt_nhn; 75 unsigned int rt_nhn_alive; 76 struct mpls_nh rt_nh[0]; 77 }; 78 79 #define for_nexthops(rt) { \ 80 int nhsel; struct mpls_nh *nh; \ 81 for (nhsel = 0, nh = (rt)->rt_nh; \ 82 nhsel < (rt)->rt_nhn; \ 83 nh++, nhsel++) 84 85 #define change_nexthops(rt) { \ 86 int nhsel; struct mpls_nh *nh; \ 87 for (nhsel = 0, nh = (struct mpls_nh *)((rt)->rt_nh); \ 88 nhsel < (rt)->rt_nhn; \ 89 nh++, nhsel++) 90 91 #define endfor_nexthops(rt) } 92 93 static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos) 94 { 95 struct mpls_shim_hdr result; 96 result.label_stack_entry = 97 cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) | 98 (tc << MPLS_LS_TC_SHIFT) | 99 (bos ? (1 << MPLS_LS_S_SHIFT) : 0) | 100 (ttl << MPLS_LS_TTL_SHIFT)); 101 return result; 102 } 103 104 static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr) 105 { 106 struct mpls_entry_decoded result; 107 unsigned entry = be32_to_cpu(hdr->label_stack_entry); 108 109 result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT; 110 result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT; 111 result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT; 112 result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT; 113 114 return result; 115 } 116 117 int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels, 118 const u32 label[]); 119 int nla_get_labels(const struct nlattr *nla, u32 max_labels, u8 *labels, 120 u32 label[]); 121 int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, 122 u8 via[]); 123 bool mpls_output_possible(const struct net_device *dev); 124 unsigned int mpls_dev_mtu(const struct net_device *dev); 125 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu); 126 127 #endif /* MPLS_INTERNAL_H */ 128