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_pcpu_stats { 13 struct mpls_link_stats stats; 14 struct u64_stats_sync syncp; 15 }; 16 17 struct mpls_dev { 18 int input_enabled; 19 struct net_device *dev; 20 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 64 struct sk_buff; 65 66 #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 */ 70 #define VIA_ALEN_ALIGN sizeof(unsigned long) 71 #define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, VIA_ALEN_ALIGN)) 72 73 enum 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 84 struct mpls_nh { /* next hop label forwarding entry */ 85 struct net_device __rcu *nh_dev; 86 unsigned int nh_flags; 87 u32 nh_label[MAX_NEW_LABELS]; 88 u8 nh_labels; 89 u8 nh_via_alen; 90 u8 nh_via_table; 91 }; 92 93 /* 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 */ 114 struct mpls_route { /* next hop label forwarding entry */ 115 struct rcu_head rt_rcu; 116 u8 rt_protocol; 117 u8 rt_payload_type; 118 u8 rt_max_alen; 119 unsigned int rt_nhn; 120 unsigned int rt_nhn_alive; 121 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) } 137 138 static 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 } 148 149 static 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 } 161 162 static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev) 163 { 164 return rcu_dereference_rtnl(dev->mpls_ptr); 165 } 166 167 int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels, 168 const u32 label[]); 169 int nla_get_labels(const struct nlattr *nla, u32 max_labels, u8 *labels, 170 u32 label[]); 171 int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, 172 u8 via[]); 173 bool mpls_output_possible(const struct net_device *dev); 174 unsigned int mpls_dev_mtu(const struct net_device *dev); 175 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu); 176 void mpls_stats_inc_outucastpkts(struct net_device *dev, 177 const struct sk_buff *skb); 178 179 #endif /* MPLS_INTERNAL_H */ 180