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Eric W. Biederman01891972015-03-03 19:10:47 -06001#ifndef MPLS_INTERNAL_H
2#define MPLS_INTERNAL_H
Jiri Benc9095e102016-09-30 19:08:06 +02003#include <net/mpls.h>
Eric W. Biederman01891972015-03-03 19:10:47 -06004
5struct mpls_entry_decoded {
6 u32 label;
7 u8 ttl;
8 u8 tc;
9 u8 bos;
10};
11
Robert Shearman27d69102017-01-16 14:16:37 +000012struct mpls_pcpu_stats {
13 struct mpls_link_stats stats;
14 struct u64_stats_sync syncp;
Robert Shearman03c57742015-04-22 11:14:37 +010015};
16
Robert Shearman27d69102017-01-16 14:16:37 +000017struct mpls_dev {
18 int input_enabled;
David Ahern24045a02017-02-20 08:03:30 -080019 struct net_device *dev;
Robert Shearman27d69102017-01-16 14:16:37 +000020 struct mpls_pcpu_stats __percpu *stats;
21
22 struct ctl_table_header *sysctl;
23 struct rcu_head rcu;
24};
25
26#if BITS_PER_LONG == 32
27
28#define MPLS_INC_STATS_LEN(mdev, len, pkts_field, bytes_field) \
29 do { \
30 __typeof__(*(mdev)->stats) *ptr = \
31 raw_cpu_ptr((mdev)->stats); \
32 local_bh_disable(); \
33 u64_stats_update_begin(&ptr->syncp); \
34 ptr->stats.pkts_field++; \
35 ptr->stats.bytes_field += (len); \
36 u64_stats_update_end(&ptr->syncp); \
37 local_bh_enable(); \
38 } while (0)
39
40#define MPLS_INC_STATS(mdev, field) \
41 do { \
42 __typeof__(*(mdev)->stats) *ptr = \
43 raw_cpu_ptr((mdev)->stats); \
44 local_bh_disable(); \
45 u64_stats_update_begin(&ptr->syncp); \
46 ptr->stats.field++; \
47 u64_stats_update_end(&ptr->syncp); \
48 local_bh_enable(); \
49 } while (0)
50
51#else
52
53#define MPLS_INC_STATS_LEN(mdev, len, pkts_field, bytes_field) \
54 do { \
55 this_cpu_inc((mdev)->stats->stats.pkts_field); \
56 this_cpu_add((mdev)->stats->stats.bytes_field, (len)); \
57 } while (0)
58
59#define MPLS_INC_STATS(mdev, field) \
60 this_cpu_inc((mdev)->stats->stats.field)
61
62#endif
63
Eric W. Biederman01891972015-03-03 19:10:47 -060064struct sk_buff;
65
Roopa Prabhuf8efb732015-10-23 06:03:27 -070066#define LABEL_NOT_SPECIFIED (1 << 20)
67#define MAX_NEW_LABELS 2
68
69/* This maximum ha length copied from the definition of struct neighbour */
Robert Shearmancf4b24f2015-10-27 00:37:36 +000070#define VIA_ALEN_ALIGN sizeof(unsigned long)
71#define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, VIA_ALEN_ALIGN))
Roopa Prabhuf8efb732015-10-23 06:03:27 -070072
73enum mpls_payload_type {
74 MPT_UNSPEC, /* IPv4 or IPv6 */
75 MPT_IPV4 = 4,
76 MPT_IPV6 = 6,
77
78 /* Other types not implemented:
79 * - Pseudo-wire with or without control word (RFC4385)
80 * - GAL (RFC5586)
81 */
82};
83
84struct mpls_nh { /* next hop label forwarding entry */
85 struct net_device __rcu *nh_dev;
Roopa Prabhuc89359a2015-12-01 22:18:11 -080086 unsigned int nh_flags;
Roopa Prabhuf8efb732015-10-23 06:03:27 -070087 u32 nh_label[MAX_NEW_LABELS];
88 u8 nh_labels;
89 u8 nh_via_alen;
90 u8 nh_via_table;
Roopa Prabhuf8efb732015-10-23 06:03:27 -070091};
92
Robert Shearmancf4b24f2015-10-27 00:37:36 +000093/* The route, nexthops and vias are stored together in the same memory
94 * block:
95 *
96 * +----------------------+
97 * | mpls_route |
98 * +----------------------+
99 * | mpls_nh 0 |
100 * +----------------------+
101 * | ... |
102 * +----------------------+
103 * | mpls_nh n-1 |
104 * +----------------------+
105 * | alignment padding |
106 * +----------------------+
107 * | via[rt_max_alen] 0 |
108 * +----------------------+
109 * | ... |
110 * +----------------------+
111 * | via[rt_max_alen] n-1 |
112 * +----------------------+
113 */
Roopa Prabhuf8efb732015-10-23 06:03:27 -0700114struct mpls_route { /* next hop label forwarding entry */
115 struct rcu_head rt_rcu;
116 u8 rt_protocol;
117 u8 rt_payload_type;
Robert Shearmancf4b24f2015-10-27 00:37:36 +0000118 u8 rt_max_alen;
119 unsigned int rt_nhn;
Roopa Prabhuc89359a2015-12-01 22:18:11 -0800120 unsigned int rt_nhn_alive;
Roopa Prabhuf8efb732015-10-23 06:03:27 -0700121 struct mpls_nh rt_nh[0];
122};
123
124#define for_nexthops(rt) { \
125 int nhsel; struct mpls_nh *nh; \
126 for (nhsel = 0, nh = (rt)->rt_nh; \
127 nhsel < (rt)->rt_nhn; \
128 nh++, nhsel++)
129
130#define change_nexthops(rt) { \
131 int nhsel; struct mpls_nh *nh; \
132 for (nhsel = 0, nh = (struct mpls_nh *)((rt)->rt_nh); \
133 nhsel < (rt)->rt_nhn; \
134 nh++, nhsel++)
135
136#define endfor_nexthops(rt) }
137
Eric W. Biederman01891972015-03-03 19:10:47 -0600138static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
139{
140 struct mpls_shim_hdr result;
141 result.label_stack_entry =
142 cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
143 (tc << MPLS_LS_TC_SHIFT) |
144 (bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
145 (ttl << MPLS_LS_TTL_SHIFT));
146 return result;
147}
148
149static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
150{
151 struct mpls_entry_decoded result;
152 unsigned entry = be32_to_cpu(hdr->label_stack_entry);
153
154 result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
155 result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
156 result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
157 result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
158
159 return result;
160}
161
Robert Shearman27d69102017-01-16 14:16:37 +0000162static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev)
163{
164 return rcu_dereference_rtnl(dev->mpls_ptr);
165}
166
Roopa Prabhuface0182015-07-21 10:43:52 +0200167int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels,
168 const u32 label[]);
Roopa Prabhuf8efb732015-10-23 06:03:27 -0700169int nla_get_labels(const struct nlattr *nla, u32 max_labels, u8 *labels,
Roopa Prabhuface0182015-07-21 10:43:52 +0200170 u32 label[]);
Roopa Prabhuf8efb732015-10-23 06:03:27 -0700171int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
172 u8 via[]);
Roopa Prabhuface0182015-07-21 10:43:52 +0200173bool mpls_output_possible(const struct net_device *dev);
174unsigned int mpls_dev_mtu(const struct net_device *dev);
175bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
Robert Shearman27d69102017-01-16 14:16:37 +0000176void mpls_stats_inc_outucastpkts(struct net_device *dev,
177 const struct sk_buff *skb);
Eric W. Biederman966bae32015-03-03 19:13:19 -0600178
Eric W. Biederman01891972015-03-03 19:10:47 -0600179#endif /* MPLS_INTERNAL_H */