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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
0189197f EB |
2 | #ifndef MPLS_INTERNAL_H |
3 | #define MPLS_INTERNAL_H | |
9095e10e | 4 | #include <net/mpls.h> |
0189197f | 5 | |
1511009c DA |
6 | /* put a reasonable limit on the number of labels |
7 | * we will accept from userspace | |
8 | */ | |
9 | #define MAX_NEW_LABELS 30 | |
10 | ||
0189197f EB |
11 | struct mpls_entry_decoded { |
12 | u32 label; | |
13 | u8 ttl; | |
14 | u8 tc; | |
15 | u8 bos; | |
16 | }; | |
17 | ||
27d69105 RS |
18 | struct mpls_pcpu_stats { |
19 | struct mpls_link_stats stats; | |
20 | struct u64_stats_sync syncp; | |
21 | }; | |
22 | ||
03c57747 | 23 | struct mpls_dev { |
27d69105 | 24 | int input_enabled; |
24045a03 | 25 | struct net_device *dev; |
27d69105 RS |
26 | struct mpls_pcpu_stats __percpu *stats; |
27 | ||
28 | struct ctl_table_header *sysctl; | |
29 | struct rcu_head rcu; | |
03c57747 RS |
30 | }; |
31 | ||
27d69105 RS |
32 | #if BITS_PER_LONG == 32 |
33 | ||
34 | #define MPLS_INC_STATS_LEN(mdev, len, pkts_field, bytes_field) \ | |
35 | do { \ | |
36 | __typeof__(*(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__(*(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 | ||
0189197f EB |
70 | struct sk_buff; |
71 | ||
f8efb73c | 72 | #define LABEL_NOT_SPECIFIED (1 << 20) |
f8efb73c RP |
73 | |
74 | /* This maximum ha length copied from the definition of struct neighbour */ | |
cf4b24f0 RS |
75 | #define VIA_ALEN_ALIGN sizeof(unsigned long) |
76 | #define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, VIA_ALEN_ALIGN)) | |
f8efb73c RP |
77 | |
78 | enum 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 | ||
89 | struct mpls_nh { /* next hop label forwarding entry */ | |
90 | struct net_device __rcu *nh_dev; | |
39eb8cd1 DA |
91 | |
92 | /* nh_flags is accessed under RCU in the packet path; it is | |
93 | * modified handling netdev events with rtnl lock held | |
94 | */ | |
c89359a4 | 95 | unsigned int nh_flags; |
f8efb73c RP |
96 | u8 nh_labels; |
97 | u8 nh_via_alen; | |
98 | u8 nh_via_table; | |
59b20966 DA |
99 | u8 nh_reserved1; |
100 | ||
101 | u32 nh_label[0]; | |
f8efb73c RP |
102 | }; |
103 | ||
59b20966 DA |
104 | /* offset of via from beginning of mpls_nh */ |
105 | #define MPLS_NH_VIA_OFF(num_labels) \ | |
106 | ALIGN(sizeof(struct mpls_nh) + (num_labels) * sizeof(u32), \ | |
107 | VIA_ALEN_ALIGN) | |
108 | ||
109 | /* all nexthops within a route have the same size based on the | |
110 | * max number of labels and max via length across all nexthops | |
111 | */ | |
112 | #define MPLS_NH_SIZE(num_labels, max_via_alen) \ | |
113 | (MPLS_NH_VIA_OFF((num_labels)) + \ | |
114 | ALIGN((max_via_alen), VIA_ALEN_ALIGN)) | |
115 | ||
5b441ac8 RS |
116 | enum mpls_ttl_propagation { |
117 | MPLS_TTL_PROP_DEFAULT, | |
118 | MPLS_TTL_PROP_ENABLED, | |
119 | MPLS_TTL_PROP_DISABLED, | |
120 | }; | |
121 | ||
cf4b24f0 RS |
122 | /* The route, nexthops and vias are stored together in the same memory |
123 | * block: | |
124 | * | |
125 | * +----------------------+ | |
126 | * | mpls_route | | |
127 | * +----------------------+ | |
128 | * | mpls_nh 0 | | |
129 | * +----------------------+ | |
59b20966 | 130 | * | alignment padding | 4 bytes for odd number of labels |
cf4b24f0 RS |
131 | * +----------------------+ |
132 | * | via[rt_max_alen] 0 | | |
133 | * +----------------------+ | |
59b20966 DA |
134 | * | alignment padding | via's aligned on sizeof(unsigned long) |
135 | * +----------------------+ | |
cf4b24f0 RS |
136 | * | ... | |
137 | * +----------------------+ | |
59b20966 DA |
138 | * | mpls_nh n-1 | |
139 | * +----------------------+ | |
cf4b24f0 RS |
140 | * | via[rt_max_alen] n-1 | |
141 | * +----------------------+ | |
142 | */ | |
f8efb73c RP |
143 | struct mpls_route { /* next hop label forwarding entry */ |
144 | struct rcu_head rt_rcu; | |
145 | u8 rt_protocol; | |
146 | u8 rt_payload_type; | |
cf4b24f0 | 147 | u8 rt_max_alen; |
5b441ac8 | 148 | u8 rt_ttl_propagate; |
77ef013a | 149 | u8 rt_nhn; |
39eb8cd1 DA |
150 | /* rt_nhn_alive is accessed under RCU in the packet path; it |
151 | * is modified handling netdev events with rtnl lock held | |
152 | */ | |
77ef013a | 153 | u8 rt_nhn_alive; |
59b20966 DA |
154 | u8 rt_nh_size; |
155 | u8 rt_via_offset; | |
156 | u8 rt_reserved1; | |
f8efb73c RP |
157 | struct mpls_nh rt_nh[0]; |
158 | }; | |
159 | ||
160 | #define for_nexthops(rt) { \ | |
59b20966 DA |
161 | int nhsel; struct mpls_nh *nh; u8 *__nh; \ |
162 | for (nhsel = 0, nh = (rt)->rt_nh, __nh = (u8 *)((rt)->rt_nh); \ | |
f8efb73c | 163 | nhsel < (rt)->rt_nhn; \ |
59b20966 | 164 | __nh += rt->rt_nh_size, nh = (struct mpls_nh *)__nh, nhsel++) |
f8efb73c RP |
165 | |
166 | #define change_nexthops(rt) { \ | |
59b20966 DA |
167 | int nhsel; struct mpls_nh *nh; u8 *__nh; \ |
168 | for (nhsel = 0, nh = (struct mpls_nh *)((rt)->rt_nh), \ | |
169 | __nh = (u8 *)((rt)->rt_nh); \ | |
f8efb73c | 170 | nhsel < (rt)->rt_nhn; \ |
59b20966 | 171 | __nh += rt->rt_nh_size, nh = (struct mpls_nh *)__nh, nhsel++) |
f8efb73c RP |
172 | |
173 | #define endfor_nexthops(rt) } | |
174 | ||
0189197f EB |
175 | static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos) |
176 | { | |
177 | struct mpls_shim_hdr result; | |
178 | result.label_stack_entry = | |
179 | cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) | | |
180 | (tc << MPLS_LS_TC_SHIFT) | | |
181 | (bos ? (1 << MPLS_LS_S_SHIFT) : 0) | | |
182 | (ttl << MPLS_LS_TTL_SHIFT)); | |
183 | return result; | |
184 | } | |
185 | ||
186 | static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr) | |
187 | { | |
188 | struct mpls_entry_decoded result; | |
189 | unsigned entry = be32_to_cpu(hdr->label_stack_entry); | |
190 | ||
191 | result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT; | |
192 | result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT; | |
193 | result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT; | |
194 | result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT; | |
195 | ||
196 | return result; | |
197 | } | |
198 | ||
27d69105 RS |
199 | static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev) |
200 | { | |
201 | return rcu_dereference_rtnl(dev->mpls_ptr); | |
202 | } | |
203 | ||
face0188 RP |
204 | int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels, |
205 | const u32 label[]); | |
a4ac8c98 | 206 | int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, |
a1f10abe | 207 | u32 label[], struct netlink_ext_ack *extack); |
face0188 RP |
208 | bool mpls_output_possible(const struct net_device *dev); |
209 | unsigned int mpls_dev_mtu(const struct net_device *dev); | |
210 | bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu); | |
27d69105 RS |
211 | void mpls_stats_inc_outucastpkts(struct net_device *dev, |
212 | const struct sk_buff *skb); | |
966bae33 | 213 | |
0189197f | 214 | #endif /* MPLS_INTERNAL_H */ |