Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef MPLS_INTERNAL_H
3#define MPLS_INTERNAL_H
4#include <net/mpls.h>
5
6/* put a reasonable limit on the number of labels
7 * we will accept from userspace
8 */
9#define MAX_NEW_LABELS 30
10
11struct mpls_entry_decoded {
12 u32 label;
13 u8 ttl;
14 u8 tc;
15 u8 bos;
16};
17
18struct mpls_pcpu_stats {
19 struct mpls_link_stats stats;
20 struct u64_stats_sync syncp;
21};
22
23struct mpls_dev {
24 int input_enabled;
25 struct net_device *dev;
26 struct mpls_pcpu_stats __percpu *stats;
27
28 struct ctl_table_header *sysctl;
29 struct rcu_head rcu;
30};
31
32#if BITS_PER_LONG == 32
33
34#define MPLS_INC_STATS_LEN(mdev, len, pkts_field, bytes_field) \
35 do { \
36 TYPEOF_UNQUAL(*(mdev)->stats) *ptr = \
37 raw_cpu_ptr((mdev)->stats); \
38 local_bh_disable(); \
39 u64_stats_update_begin(&ptr->syncp); \
40 ptr->stats.pkts_field++; \
41 ptr->stats.bytes_field += (len); \
42 u64_stats_update_end(&ptr->syncp); \
43 local_bh_enable(); \
44 } while (0)
45
46#define MPLS_INC_STATS(mdev, field) \
47 do { \
48 TYPEOF_UNQUAL(*(mdev)->stats) *ptr = \
49 raw_cpu_ptr((mdev)->stats); \
50 local_bh_disable(); \
51 u64_stats_update_begin(&ptr->syncp); \
52 ptr->stats.field++; \
53 u64_stats_update_end(&ptr->syncp); \
54 local_bh_enable(); \
55 } while (0)
56
57#else
58
59#define MPLS_INC_STATS_LEN(mdev, len, pkts_field, bytes_field) \
60 do { \
61 this_cpu_inc((mdev)->stats->stats.pkts_field); \
62 this_cpu_add((mdev)->stats->stats.bytes_field, (len)); \
63 } while (0)
64
65#define MPLS_INC_STATS(mdev, field) \
66 this_cpu_inc((mdev)->stats->stats.field)
67
68#endif
69
70struct sk_buff;
71
72#define LABEL_NOT_SPECIFIED (1 << 20)
73
74/* This maximum ha length copied from the definition of struct neighbour */
75#define VIA_ALEN_ALIGN sizeof(unsigned long)
76#define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, VIA_ALEN_ALIGN))
77
78enum mpls_payload_type {
79 MPT_UNSPEC, /* IPv4 or IPv6 */
80 MPT_IPV4 = 4,
81 MPT_IPV6 = 6,
82
83 /* Other types not implemented:
84 * - Pseudo-wire with or without control word (RFC4385)
85 * - GAL (RFC5586)
86 */
87};
88
89struct mpls_nh { /* next hop label forwarding entry */
90 struct net_device *nh_dev;
91 netdevice_tracker nh_dev_tracker;
92
93 /* nh_flags is accessed under RCU in the packet path; it is
94 * modified handling netdev events with rtnl lock held
95 */
96 unsigned int nh_flags;
97 u8 nh_labels;
98 u8 nh_via_alen;
99 u8 nh_via_table;
100 u8 nh_reserved1;
101
102 u32 nh_label[];
103};
104
105/* offset of via from beginning of mpls_nh */
106#define MPLS_NH_VIA_OFF(num_labels) \
107 ALIGN(sizeof(struct mpls_nh) + (num_labels) * sizeof(u32), \
108 VIA_ALEN_ALIGN)
109
110/* all nexthops within a route have the same size based on the
111 * max number of labels and max via length across all nexthops
112 */
113#define MPLS_NH_SIZE(num_labels, max_via_alen) \
114 (MPLS_NH_VIA_OFF((num_labels)) + \
115 ALIGN((max_via_alen), VIA_ALEN_ALIGN))
116
117enum mpls_ttl_propagation {
118 MPLS_TTL_PROP_DEFAULT,
119 MPLS_TTL_PROP_ENABLED,
120 MPLS_TTL_PROP_DISABLED,
121};
122
123/* The route, nexthops and vias are stored together in the same memory
124 * block:
125 *
126 * +----------------------+
127 * | mpls_route |
128 * +----------------------+
129 * | mpls_nh 0 |
130 * +----------------------+
131 * | alignment padding | 4 bytes for odd number of labels
132 * +----------------------+
133 * | via[rt_max_alen] 0 |
134 * +----------------------+
135 * | alignment padding | via's aligned on sizeof(unsigned long)
136 * +----------------------+
137 * | ... |
138 * +----------------------+
139 * | mpls_nh n-1 |
140 * +----------------------+
141 * | via[rt_max_alen] n-1 |
142 * +----------------------+
143 */
144struct mpls_route { /* next hop label forwarding entry */
145 struct rcu_head rt_rcu;
146 u8 rt_protocol;
147 u8 rt_payload_type;
148 u8 rt_max_alen;
149 u8 rt_ttl_propagate;
150 u8 rt_nhn;
151 /* rt_nhn_alive is accessed under RCU in the packet path; it
152 * is modified handling netdev events with rtnl lock held
153 */
154 u8 rt_nhn_alive;
155 u8 rt_nh_size;
156 u8 rt_via_offset;
157 u8 rt_reserved1;
158 struct mpls_nh rt_nh[];
159};
160
161#define for_nexthops(rt) { \
162 int nhsel; const struct mpls_nh *nh; \
163 for (nhsel = 0, nh = (rt)->rt_nh; \
164 nhsel < (rt)->rt_nhn; \
165 nh = (void *)nh + (rt)->rt_nh_size, nhsel++)
166
167#define change_nexthops(rt) { \
168 int nhsel; struct mpls_nh *nh; \
169 for (nhsel = 0, nh = (rt)->rt_nh; \
170 nhsel < (rt)->rt_nhn; \
171 nh = (void *)nh + (rt)->rt_nh_size, nhsel++)
172
173#define endfor_nexthops(rt) }
174
175static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
176{
177 struct mpls_entry_decoded result;
178 unsigned entry = be32_to_cpu(hdr->label_stack_entry);
179
180 result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
181 result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
182 result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
183 result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
184
185 return result;
186}
187
188#define mpls_dereference(net, p) \
189 rcu_dereference_protected( \
190 (p), \
191 lockdep_is_held(&(net)->mpls.platform_mutex))
192
193static inline struct mpls_dev *mpls_dev_rcu(const struct net_device *dev)
194{
195 return rcu_dereference(dev->mpls_ptr);
196}
197
198static inline struct mpls_dev *mpls_dev_get(const struct net *net,
199 const struct net_device *dev)
200{
201 return mpls_dereference(net, dev->mpls_ptr);
202}
203
204int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels,
205 const u32 label[]);
206int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
207 u32 label[], struct netlink_ext_ack *extack);
208bool mpls_output_possible(const struct net_device *dev);
209unsigned int mpls_dev_mtu(const struct net_device *dev);
210bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
211void mpls_stats_inc_outucastpkts(struct net *net,
212 struct net_device *dev,
213 const struct sk_buff *skb);
214
215#endif /* MPLS_INTERNAL_H */