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0189197f EB |
1 | #ifndef MPLS_INTERNAL_H |
2 | #define MPLS_INTERNAL_H | |
3 | ||
0189197f EB |
4 | struct mpls_shim_hdr { |
5 | __be32 label_stack_entry; | |
6 | }; | |
7 | ||
8 | struct mpls_entry_decoded { | |
9 | u32 label; | |
10 | u8 ttl; | |
11 | u8 tc; | |
12 | u8 bos; | |
13 | }; | |
14 | ||
03c57747 | 15 | struct mpls_dev { |
37bde799 RS |
16 | int input_enabled; |
17 | ||
18 | struct ctl_table_header *sysctl; | |
25cc8f07 | 19 | struct rcu_head rcu; |
03c57747 RS |
20 | }; |
21 | ||
0189197f EB |
22 | struct sk_buff; |
23 | ||
f8efb73c RP |
24 | #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 */ | |
cf4b24f0 RS |
28 | #define VIA_ALEN_ALIGN sizeof(unsigned long) |
29 | #define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, VIA_ALEN_ALIGN)) | |
f8efb73c RP |
30 | |
31 | enum mpls_payload_type { | |
32 | MPT_UNSPEC, /* IPv4 or IPv6 */ | |
33 | MPT_IPV4 = 4, | |
34 | MPT_IPV6 = 6, | |
35 | ||
36 | /* Other types not implemented: | |
37 | * - Pseudo-wire with or without control word (RFC4385) | |
38 | * - GAL (RFC5586) | |
39 | */ | |
40 | }; | |
41 | ||
42 | struct mpls_nh { /* next hop label forwarding entry */ | |
43 | struct net_device __rcu *nh_dev; | |
44 | u32 nh_label[MAX_NEW_LABELS]; | |
45 | u8 nh_labels; | |
46 | u8 nh_via_alen; | |
47 | u8 nh_via_table; | |
f8efb73c RP |
48 | }; |
49 | ||
cf4b24f0 RS |
50 | /* The route, nexthops and vias are stored together in the same memory |
51 | * block: | |
52 | * | |
53 | * +----------------------+ | |
54 | * | mpls_route | | |
55 | * +----------------------+ | |
56 | * | mpls_nh 0 | | |
57 | * +----------------------+ | |
58 | * | ... | | |
59 | * +----------------------+ | |
60 | * | mpls_nh n-1 | | |
61 | * +----------------------+ | |
62 | * | alignment padding | | |
63 | * +----------------------+ | |
64 | * | via[rt_max_alen] 0 | | |
65 | * +----------------------+ | |
66 | * | ... | | |
67 | * +----------------------+ | |
68 | * | via[rt_max_alen] n-1 | | |
69 | * +----------------------+ | |
70 | */ | |
f8efb73c RP |
71 | struct mpls_route { /* next hop label forwarding entry */ |
72 | struct rcu_head rt_rcu; | |
73 | u8 rt_protocol; | |
74 | u8 rt_payload_type; | |
cf4b24f0 RS |
75 | u8 rt_max_alen; |
76 | unsigned int rt_nhn; | |
f8efb73c RP |
77 | struct mpls_nh rt_nh[0]; |
78 | }; | |
79 | ||
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; \ | |
84 | nh++, nhsel++) | |
85 | ||
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; \ | |
90 | nh++, nhsel++) | |
91 | ||
92 | #define endfor_nexthops(rt) } | |
93 | ||
0189197f EB |
94 | static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb) |
95 | { | |
96 | return (struct mpls_shim_hdr *)skb_network_header(skb); | |
97 | } | |
98 | ||
99 | static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos) | |
100 | { | |
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)); | |
107 | return result; | |
108 | } | |
109 | ||
110 | static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr) | |
111 | { | |
112 | struct mpls_entry_decoded result; | |
113 | unsigned entry = be32_to_cpu(hdr->label_stack_entry); | |
114 | ||
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; | |
119 | ||
120 | return result; | |
121 | } | |
122 | ||
face0188 RP |
123 | int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels, |
124 | const u32 label[]); | |
f8efb73c | 125 | int nla_get_labels(const struct nlattr *nla, u32 max_labels, u8 *labels, |
face0188 | 126 | u32 label[]); |
f8efb73c RP |
127 | int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, |
128 | u8 via[]); | |
face0188 RP |
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); | |
966bae33 | 132 | |
0189197f | 133 | #endif /* MPLS_INTERNAL_H */ |