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User-Space MPLS actions and matches

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This patch implements use-space datapath and non-datapath code
to match and use the datapath API set out in Leo Alterman's patch
"user-space datapath: Add basic MPLS support to kernel".

The resulting MPLS implementation supports:
* Pushing a single MPLS label
* Poping a single MPLS label
* Modifying an MPLS lable using set-field or load actions
  that act on the label value, tc and bos bit.
* There is no support for manipulating the TTL
  this is considered future work.

The single-level push pop limitation is implemented by processing
push, pop and set-field/load actions in order and discarding information
that would require multiple levels of push/pop to be supported.

e.g.
   push,push -> the first push is discarded
   pop,pop -> the first pop is discarded

This patch is based heavily on work by Ravi K.

Cc: Ravi K <rkerur@gmail.com>
Reviewed-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Simon Horman
2013-01-25 16:22:07 +09:00
committed by Ben Pfaff
parent d224e35014
commit b02475c53b
29 changed files with 1223 additions and 61 deletions
Download Patch File Download Diff File Expand all files Collapse all files

80
lib/packets.h
View File

@@ -140,6 +140,10 @@ void compose_rarp(struct ofpbuf *, const uint8_t eth_src[ETH_ADDR_LEN]);
void eth_push_vlan(struct ofpbuf *, ovs_be16 tci);
void eth_pop_vlan(struct ofpbuf *);
uint16_t eth_mpls_depth(const struct ofpbuf *packet);
void set_ethertype(struct ofpbuf *packet, ovs_be16 eth_type);
const char *eth_from_hex(const char *hex, struct ofpbuf **packetp);
void eth_format_masked(const uint8_t eth[ETH_ADDR_LEN],
const uint8_t mask[ETH_ADDR_LEN], struct ds *s);
@@ -147,6 +151,16 @@ void eth_addr_bitand(const uint8_t src[ETH_ADDR_LEN],
const uint8_t mask[ETH_ADDR_LEN],
uint8_t dst[ETH_ADDR_LEN]);
void set_mpls_lse(struct ofpbuf *, ovs_be32 label);
void push_mpls(struct ofpbuf *packet, ovs_be16 ethtype, ovs_be32 lse);
void pop_mpls(struct ofpbuf *, ovs_be16 ethtype);
void set_mpls_lse_tc(ovs_be32 *lse, uint8_t tc);
void set_mpls_lse_label(ovs_be32 *lse, ovs_be32 label);
void set_mpls_lse_bos(ovs_be32 *lse, uint8_t bos);
ovs_be32 set_mpls_lse_values(uint8_t ttl, uint8_t tc, uint8_t bos,
ovs_be32 label);
/* Example:
*
* uint8_t mac[ETH_ADDR_LEN];
@@ -186,6 +200,12 @@ void eth_addr_bitand(const uint8_t src[ETH_ADDR_LEN],
#define ETH_TYPE_MPLS 0x8847
#define ETH_TYPE_MPLS_MCAST 0x8848
static inline bool eth_type_mpls(ovs_be16 eth_type)
{
return eth_type == htons(ETH_TYPE_MPLS) ||
eth_type == htons(ETH_TYPE_MPLS_MCAST);
}
/* Minimum value for an Ethernet type. Values below this are IEEE 802.2 frame
* lengths. */
#define ETH_TYPE_MIN 0x600
@@ -272,6 +292,66 @@ struct vlan_eth_header {
} __attribute__((packed));
BUILD_ASSERT_DECL(VLAN_ETH_HEADER_LEN == sizeof(struct vlan_eth_header));
/* MPLS related definitions */
#define MPLS_TTL_MASK 0x000000ff
#define MPLS_TTL_SHIFT 0
#define MPLS_BOS_MASK 0x00000100
#define MPLS_BOS_SHIFT 8
#define MPLS_TC_MASK 0x00000e00
#define MPLS_TC_SHIFT 9
#define MPLS_LABEL_MASK 0xfffff000
#define MPLS_LABEL_SHIFT 12
#define MPLS_HLEN 4
struct mpls_hdr {
ovs_be32 mpls_lse;
};
BUILD_ASSERT_DECL(MPLS_HLEN == sizeof(struct mpls_hdr));
/* Given a mpls label stack entry in network byte order
* return mpls label in host byte order */
static inline uint32_t
mpls_lse_to_label(ovs_be32 mpls_lse)
{
return (ntohl(mpls_lse) & MPLS_LABEL_MASK) >> MPLS_LABEL_SHIFT;
}
/* Given a mpls label stack entry in network byte order
* return mpls tc */
static inline uint8_t
mpls_lse_to_tc(ovs_be32 mpls_lse)
{
return (ntohl(mpls_lse) & MPLS_TC_MASK) >> MPLS_TC_SHIFT;
}
/* Given a mpls label stack entry in network byte order
* return mpls ttl */
static inline uint8_t
mpls_lse_to_ttl(ovs_be32 mpls_lse)
{
return (ntohl(mpls_lse) & MPLS_TTL_MASK) >> MPLS_TTL_SHIFT;
}
/* Set TTL in mpls lse. */
static inline void
flow_set_mpls_lse_ttl(ovs_be32 *mpls_lse, uint8_t ttl)
{
*mpls_lse &= ~htonl(MPLS_TTL_MASK);
*mpls_lse |= htonl(ttl << MPLS_TTL_SHIFT);
}
/* Given a mpls label stack entry in network byte order
* return mpls BoS bit */
static inline uint8_t
mpls_lse_to_bos(ovs_be32 mpls_lse)
{
return (mpls_lse & htonl(MPLS_BOS_MASK)) != 0;
}
#define IP_FMT "%"PRIu32".%"PRIu32".%"PRIu32".%"PRIu32
#define IP_ARGS(ip) \
ntohl(ip) >> 24, \