提交 77a5196a 编写于 作者: W William Tu 提交者: David S. Miller

gre: add sequence number for collect md mode.

Currently GRE sequence number can only be used in native
tunnel mode.  This patch adds sequence number support for
gre collect metadata mode.  RFC2890 defines GRE sequence
number to be specific to the traffic flow identified by the
key.  However, this patch does not implement per-key seqno.
The sequence number is shared in the same tunnel device.
That is, different tunnel keys using the same collect_md
tunnel share single sequence number.
Signed-off-by: NWilliam Tu <u9012063@gmail.com>
Acked-by: NDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 a56cd508
...@@ -800,6 +800,7 @@ enum bpf_func_id { ...@@ -800,6 +800,7 @@ enum bpf_func_id {
/* BPF_FUNC_skb_set_tunnel_key flags. */ /* BPF_FUNC_skb_set_tunnel_key flags. */
#define BPF_F_ZERO_CSUM_TX (1ULL << 1) #define BPF_F_ZERO_CSUM_TX (1ULL << 1)
#define BPF_F_DONT_FRAGMENT (1ULL << 2) #define BPF_F_DONT_FRAGMENT (1ULL << 2)
#define BPF_F_SEQ_NUMBER (1ULL << 3)
/* BPF_FUNC_perf_event_output, BPF_FUNC_perf_event_read and /* BPF_FUNC_perf_event_output, BPF_FUNC_perf_event_read and
* BPF_FUNC_perf_event_read_value flags. * BPF_FUNC_perf_event_read_value flags.
......
...@@ -2991,7 +2991,7 @@ BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, ...@@ -2991,7 +2991,7 @@ BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
struct ip_tunnel_info *info; struct ip_tunnel_info *info;
if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX |
BPF_F_DONT_FRAGMENT))) BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER)))
return -EINVAL; return -EINVAL;
if (unlikely(size != sizeof(struct bpf_tunnel_key))) { if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
switch (size) { switch (size) {
...@@ -3025,6 +3025,8 @@ BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, ...@@ -3025,6 +3025,8 @@ BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; info->key.tun_flags |= TUNNEL_DONT_FRAGMENT;
if (flags & BPF_F_ZERO_CSUM_TX) if (flags & BPF_F_ZERO_CSUM_TX)
info->key.tun_flags &= ~TUNNEL_CSUM; info->key.tun_flags &= ~TUNNEL_CSUM;
if (flags & BPF_F_SEQ_NUMBER)
info->key.tun_flags |= TUNNEL_SEQ;
info->key.tun_id = cpu_to_be64(from->tunnel_id); info->key.tun_id = cpu_to_be64(from->tunnel_id);
info->key.tos = from->tunnel_tos; info->key.tos = from->tunnel_tos;
......
...@@ -522,6 +522,7 @@ static struct rtable *prepare_fb_xmit(struct sk_buff *skb, ...@@ -522,6 +522,7 @@ static struct rtable *prepare_fb_xmit(struct sk_buff *skb,
static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev, static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev,
__be16 proto) __be16 proto)
{ {
struct ip_tunnel *tunnel = netdev_priv(dev);
struct ip_tunnel_info *tun_info; struct ip_tunnel_info *tun_info;
const struct ip_tunnel_key *key; const struct ip_tunnel_key *key;
struct rtable *rt = NULL; struct rtable *rt = NULL;
...@@ -545,9 +546,11 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev, ...@@ -545,9 +546,11 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev,
if (gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM))) if (gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM)))
goto err_free_rt; goto err_free_rt;
flags = tun_info->key.tun_flags & (TUNNEL_CSUM | TUNNEL_KEY); flags = tun_info->key.tun_flags &
(TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
gre_build_header(skb, tunnel_hlen, flags, proto, gre_build_header(skb, tunnel_hlen, flags, proto,
tunnel_id_to_key32(tun_info->key.tun_id), 0); tunnel_id_to_key32(tun_info->key.tun_id),
(flags | TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) : 0);
df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
......
...@@ -695,9 +695,6 @@ static netdev_tx_t __gre6_xmit(struct sk_buff *skb, ...@@ -695,9 +695,6 @@ static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
else else
fl6->daddr = tunnel->parms.raddr; fl6->daddr = tunnel->parms.raddr;
if (tunnel->parms.o_flags & TUNNEL_SEQ)
tunnel->o_seqno++;
/* Push GRE header. */ /* Push GRE header. */
protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
...@@ -720,14 +717,20 @@ static netdev_tx_t __gre6_xmit(struct sk_buff *skb, ...@@ -720,14 +717,20 @@ static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
dsfield = key->tos; dsfield = key->tos;
flags = key->tun_flags & (TUNNEL_CSUM | TUNNEL_KEY); flags = key->tun_flags &
(TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
tunnel->tun_hlen = gre_calc_hlen(flags); tunnel->tun_hlen = gre_calc_hlen(flags);
gre_build_header(skb, tunnel->tun_hlen, gre_build_header(skb, tunnel->tun_hlen,
flags, protocol, flags, protocol,
tunnel_id_to_key32(tun_info->key.tun_id), 0); tunnel_id_to_key32(tun_info->key.tun_id),
(flags | TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
: 0);
} else { } else {
if (tunnel->parms.o_flags & TUNNEL_SEQ)
tunnel->o_seqno++;
gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
protocol, tunnel->parms.o_key, protocol, tunnel->parms.o_key,
htonl(tunnel->o_seqno)); htonl(tunnel->o_seqno));
......
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