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ip_gre: Refector the erpsan tunnel code. 

Move two erspan functions to header file, erspan.h, so ipv6
erspan implementation can use it.

Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Tu 2017-11-30 11:51:27 -08:00 committed by David S. Miller
parent 50e0f5c038
commit a3222dc95c
2 changed files with 56 additions and 49 deletions
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51
include/net/erspan.h
View File

@ -58,4 +58,55 @@ struct erspanhdr {
struct erspan_metadata md;
};
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,
__be32 id, u32 index,
bool truncate, bool is_ipv4)
{
struct ethhdr *eth = eth_hdr(skb);
enum erspan_encap_type enc_type;
struct erspanhdr *ershdr;
struct qtag_prefix {
__be16 eth_type;
__be16 tci;
} *qp;
u16 vlan_tci = 0;
u8 tos;
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));
ershdr = (struct erspanhdr *)skb->data;
memset(ershdr, 0, sizeof(*ershdr));
ershdr->ver_vlan = htons((vlan_tci & VLAN_MASK) |
(ERSPAN_VERSION << VER_OFFSET));
ershdr->session_id = htons((u16)(ntohl(id) & ID_MASK) |
((tos_to_cos(tos) << COS_OFFSET) & COS_MASK) |
(enc_type << EN_OFFSET & EN_MASK) |
((truncate << T_OFFSET) & T_MASK));
ershdr->md.index = htonl(index & INDEX_MASK);
}
#endif

54
net/ipv4/ip_gre.c
View File

@ -114,7 +114,8 @@ MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
static struct rtnl_link_ops ipgre_link_ops __read_mostly;
static int ipgre_tunnel_init(struct net_device *dev);
static void erspan_build_header(struct sk_buff *skb,
__be32 id, u32 index, bool truncate);
__be32 id, u32 index,
bool truncate, bool is_ipv4);
static unsigned int ipgre_net_id __read_mostly;
static unsigned int gre_tap_net_id __read_mostly;
@ -589,7 +590,7 @@ static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev,
goto err_free_rt;
erspan_build_header(skb, tunnel_id_to_key32(key->tun_id),
ntohl(md->index), truncate);
ntohl(md->index), truncate, true);
gre_build_header(skb, 8, TUNNEL_SEQ,
htons(ETH_P_ERSPAN), 0, htonl(tunnel->o_seqno++));
@ -668,52 +669,6 @@ free_skb:
return NETDEV_TX_OK;
}
static inline u8 tos_to_cos(u8 tos)
{
u8 dscp, cos;
dscp = tos >> 2;
cos = dscp >> 3;
return cos;
}
static void erspan_build_header(struct sk_buff *skb,
__be32 id, u32 index, bool truncate)
{
struct iphdr *iphdr = ip_hdr(skb);
struct ethhdr *eth = eth_hdr(skb);
enum erspan_encap_type enc_type;
struct erspanhdr *ershdr;
struct qtag_prefix {
__be16 eth_type;
__be16 tci;
} *qp;
u16 vlan_tci = 0;
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));
ershdr = (struct erspanhdr *)skb->data;
memset(ershdr, 0, sizeof(*ershdr));
ershdr->ver_vlan = htons((vlan_tci & VLAN_MASK) |
(ERSPAN_VERSION << VER_OFFSET));
ershdr->session_id = htons((u16)(ntohl(id) & ID_MASK) |
((tos_to_cos(iphdr->tos) << COS_OFFSET) & COS_MASK) |
(enc_type << EN_OFFSET & EN_MASK) |
((truncate << T_OFFSET) & T_MASK));
ershdr->md.index = htonl(index & INDEX_MASK);
}
static netdev_tx_t erspan_xmit(struct sk_buff *skb,
struct net_device *dev)
{
@ -737,7 +692,8 @@ static netdev_tx_t erspan_xmit(struct sk_buff *skb,
}
/* Push ERSPAN header */
erspan_build_header(skb, tunnel->parms.o_key, tunnel->index, truncate);
erspan_build_header(skb, tunnel->parms.o_key, tunnel->index,
truncate, true);
tunnel->parms.o_flags &= ~TUNNEL_KEY;
__gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_ERSPAN));
return NETDEV_TX_OK;