1 files changed, 227 insertions, 13 deletions

diff --git a/include/net/erspan.h b/include/net/erspan.h
index ca94fc86865e..d044aa60cc76 100644
--- a/include/net/erspan.h
+++ b/include/net/erspan.h
@@ -15,7 +15,7 @@
  *  s, Recur, Flags, Version fields only S (bit 03) is set to 1. The
  *  other fields are set to zero, so only a sequence number follows.
  *
- *  ERSPAN Type II header (8 octets [42:49])
+ *  ERSPAN Version 1 (Type II) header (8 octets [42:49])
  *  0                   1                   2                   3
  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@@ -24,11 +24,31 @@
  * |      Reserved         |                  Index                |
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  *
+ *
+ *  ERSPAN Version 2 (Type III) header (12 octets [42:49])
+ *  0                   1                   2                   3
+ *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |  Ver  |          VLAN         | COS |BSO|T|     Session ID    |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |                          Timestamp                            |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |             SGT               |P|    FT   |   Hw ID   |D|Gra|O|
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ *      Platform Specific SubHeader (8 octets, optional)
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |  Platf ID |               Platform Specific Info              |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |                  Platform Specific Info                       |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
  * GRE proto ERSPAN type II = 0x88BE, type III = 0x22EB
  */
 
-#define ERSPAN_VERSION  0x1
+#include <uapi/linux/erspan.h>
 
+#define ERSPAN_VERSION  0x1     /* ERSPAN type II */
 #define VER_MASK        0xf000
 #define VLAN_MASK       0x0fff
 #define COS_MASK        0xe000
@@ -37,6 +57,19 @@
 #define ID_MASK         0x03ff
 #define INDEX_MASK      0xfffff
 
+#define ERSPAN_VERSION2 0x2     /* ERSPAN type III*/
+#define BSO_MASK        EN_MASK
+#define SGT_MASK        0xffff0000
+#define P_MASK          0x8000
+#define FT_MASK         0x7c00
+#define HWID_MASK       0x03f0
+#define DIR_MASK        0x0008
+#define GRA_MASK        0x0006
+#define O_MASK          0x0001
+
+#define HWID_OFFSET    4
+#define DIR_OFFSET     3
+
 enum erspan_encap_type {
         ERSPAN_ENCAP_NOVLAN = 0x0,      /* originally without VLAN tag */
         ERSPAN_ENCAP_ISL = 0x1,         /* originally ISL encapsulated */
@@ -44,18 +77,199 @@ enum erspan_encap_type {
         ERSPAN_ENCAP_INFRAME = 0x3,     /* VLAN tag perserved in frame */
 };
 
-struct erspan_metadata {
-        __be32 index;   /* type II */
-};
+#define ERSPAN_V1_MDSIZE        4
+#define ERSPAN_V2_MDSIZE        8
 
-struct erspanhdr {
-        __be16 ver_vlan;
-#define VER_OFFSET  12
-        __be16 session_id;
-#define COS_OFFSET  13
-#define EN_OFFSET   11
-#define T_OFFSET    10
-        struct erspan_metadata md;
+struct erspan_base_hdr {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+        __u8    vlan_upper:4,
+                ver:4;
+        __u8    vlan:8;
+        __u8    session_id_upper:2,
+                t:1,
+                en:2,
+                cos:3;
+        __u8    session_id:8;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+        __u8    ver: 4,
+                vlan_upper:4;
+        __u8    vlan:8;
+        __u8    cos:3,
+                en:2,
+                t:1,
+                session_id_upper:2;
+        __u8    session_id:8;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
 };
 
+static inline void set_session_id(struct erspan_base_hdr *ershdr, u16 id)
+{
+        ershdr->session_id = id & 0xff;
+        ershdr->session_id_upper = (id >> 8) & 0x3;
+}
+
+static inline u16 get_session_id(const struct erspan_base_hdr *ershdr)
+{
+        return (ershdr->session_id_upper << 8) + ershdr->session_id;
+}
+
+static inline void set_vlan(struct erspan_base_hdr *ershdr, u16 vlan)
+{
+        ershdr->vlan = vlan & 0xff;
+        ershdr->vlan_upper = (vlan >> 8) & 0xf;
+}
+
+static inline u16 get_vlan(const struct erspan_base_hdr *ershdr)
+{
+        return (ershdr->vlan_upper << 8) + ershdr->vlan;
+}
+
+static inline void set_hwid(struct erspan_md2 *md2, u8 hwid)
+{
+        md2->hwid = hwid & 0xf;
+        md2->hwid_upper = (hwid >> 4) & 0x3;
+}
+
+static inline u8 get_hwid(const struct erspan_md2 *md2)
+{
+        return (md2->hwid_upper << 4) + md2->hwid;
+}
+
+static inline int erspan_hdr_len(int version)
+{
+        return sizeof(struct erspan_base_hdr) +
+               (version == 1 ? ERSPAN_V1_MDSIZE : ERSPAN_V2_MDSIZE);
+}
+
+static inline u8 tos_to_cos(u8 tos)
+{
+        u8 dscp, cos;
+
+        dscp = tos >> 2;
+        cos = dscp >> 3;
+        return cos;
+}
+
+static inline void erspan_build_header(struct sk_buff *skb,
+                                u32 id, u32 index,
+                                bool truncate, bool is_ipv4)
+{
+        struct ethhdr *eth = (struct ethhdr *)skb->data;
+        enum erspan_encap_type enc_type;
+        struct erspan_base_hdr *ershdr;
+        struct qtag_prefix {
+                __be16 eth_type;
+                __be16 tci;
+        } *qp;
+        u16 vlan_tci = 0;
+        u8 tos;
+        __be32 *idx;
+
+        tos = is_ipv4 ? ip_hdr(skb)->tos :
+                        (ipv6_hdr(skb)->priority << 4) +
+                        (ipv6_hdr(skb)->flow_lbl[0] >> 4);
+
+        enc_type = ERSPAN_ENCAP_NOVLAN;
+
+        /* If mirrored packet has vlan tag, extract tci and
+         *  perserve vlan header in the mirrored frame.
+         */
+        if (eth->h_proto == htons(ETH_P_8021Q)) {
+                qp = (struct qtag_prefix *)(skb->data + 2 * ETH_ALEN);
+                vlan_tci = ntohs(qp->tci);
+                enc_type = ERSPAN_ENCAP_INFRAME;
+        }
+
+        skb_push(skb, sizeof(*ershdr) + ERSPAN_V1_MDSIZE);
+        ershdr = (struct erspan_base_hdr *)skb->data;
+        memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V1_MDSIZE);
+
+        /* Build base header */
+        ershdr->ver = ERSPAN_VERSION;
+        ershdr->cos = tos_to_cos(tos);
+        ershdr->en = enc_type;
+        ershdr->t = truncate;
+        set_vlan(ershdr, vlan_tci);
+        set_session_id(ershdr, id);
+
+        /* Build metadata */
+        idx = (__be32 *)(ershdr + 1);
+        *idx = htonl(index & INDEX_MASK);
+}
+
+/* ERSPAN GRA: timestamp granularity
+ *   00b --> granularity = 100 microseconds
+ *   01b --> granularity = 100 nanoseconds
+ *   10b --> granularity = IEEE 1588
+ * Here we only support 100 microseconds.
+ */
+static inline __be32 erspan_get_timestamp(void)
+{
+        u64 h_usecs;
+        ktime_t kt;
+
+        kt = ktime_get_real();
+        h_usecs = ktime_divns(kt, 100 * NSEC_PER_USEC);
+
+        /* ERSPAN base header only has 32-bit,
+         * so it wraps around 4 days.
+         */
+        return htonl((u32)h_usecs);
+}
+
+static inline void erspan_build_header_v2(struct sk_buff *skb,
+                                          u32 id, u8 direction, u16 hwid,
+                                          bool truncate, bool is_ipv4)
+{
+        struct ethhdr *eth = (struct ethhdr *)skb->data;
+        struct erspan_base_hdr *ershdr;
+        struct erspan_md2 *md2;
+        struct qtag_prefix {
+                __be16 eth_type;
+                __be16 tci;
+        } *qp;
+        u16 vlan_tci = 0;
+        u8 gra = 0; /* 100 usec */
+        u8 bso = 0; /* Bad/Short/Oversized */
+        u8 sgt = 0;
+        u8 tos;
+
+        tos = is_ipv4 ? ip_hdr(skb)->tos :
+                        (ipv6_hdr(skb)->priority << 4) +
+                        (ipv6_hdr(skb)->flow_lbl[0] >> 4);
+
+        /* Unlike v1, v2 does not have En field,
+         * so only extract vlan tci field.
+         */
+        if (eth->h_proto == htons(ETH_P_8021Q)) {
+                qp = (struct qtag_prefix *)(skb->data + 2 * ETH_ALEN);
+                vlan_tci = ntohs(qp->tci);
+        }
+
+        skb_push(skb, sizeof(*ershdr) + ERSPAN_V2_MDSIZE);
+        ershdr = (struct erspan_base_hdr *)skb->data;
+        memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V2_MDSIZE);
+
+        /* Build base header */
+        ershdr->ver = ERSPAN_VERSION2;
+        ershdr->cos = tos_to_cos(tos);
+        ershdr->en = bso;
+        ershdr->t = truncate;
+        set_vlan(ershdr, vlan_tci);
+        set_session_id(ershdr, id);
+
+        /* Build metadata */
+        md2 = (struct erspan_md2 *)(ershdr + 1);
+        md2->timestamp = erspan_get_timestamp();
+        md2->sgt = htons(sgt);
+        md2->p = 1;
+        md2->ft = 0;
+        md2->dir = direction;
+        md2->gra = gra;
+        md2->o = 0;
+        set_hwid(md2, hwid);
+}
+
 #endif