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gue: Add infrastructure for flags and options

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Add functions and basic definitions for processing standard flags,
private flags, and control messages. This includes definitions
to compute length of optional fields corresponding to a set of flags.
Flag validation is in validate_gue_flags function. This checks for
unknown flags, and that length of optional fields is <= length
in guehdr hlen.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2014-11-04 09:06:53 -08:00 committed by David S. Miller
parent 4bcb877d25
commit 5024c33ac3
2 changed files with 190 additions and 54 deletions
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100
include/net/gue.h
View File

@ -1,23 +1,113 @@
#ifndef __NET_GUE_H
#define __NET_GUE_H
/* Definitions for the GUE header, standard and private flags, lengths
* of optional fields are below.
*
* Diagram of GUE header:
*
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |Ver|C| Hlen | Proto/ctype | Standard flags |P|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* ~ Fields (optional) ~
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Private flags (optional, P bit is set) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* ~ Private fields (optional) ~
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* C bit indicates contol message when set, data message when unset.
* For a control message, proto/ctype is interpreted as a type of
* control message. For data messages, proto/ctype is the IP protocol
* of the next header.
*
* P bit indicates private flags field is present. The private flags
* may refer to options placed after this field.
*/
struct guehdr {
union {
struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
__u8 hlen:4,
version:4;
__u8 hlen:5,
control:1,
version:2;
#elif defined (__BIG_ENDIAN_BITFIELD)
__u8 version:4,
hlen:4;
__u8 version:2,
control:1,
hlen:5;
#else
#error "Please fix <asm/byteorder.h>"
#endif
__u8 next_hdr;
__u8 proto_ctype;
__u16 flags;
};
__u32 word;
};
};
/* Standard flags in GUE header */
#define GUE_FLAG_PRIV htons(1<<0) /* Private flags are in options */
#define GUE_LEN_PRIV 4
#define GUE_FLAGS_ALL (GUE_FLAG_PRIV)
/* Private flags in the private option extension */
#define GUE_PFLAGS_ALL (0)
/* Functions to compute options length corresponding to flags.
* If we ever have a lot of flags this can be potentially be
* converted to a more optimized algorithm (table lookup
* for instance).
*/
static inline size_t guehdr_flags_len(__be16 flags)
{
return ((flags & GUE_FLAG_PRIV) ? GUE_LEN_PRIV : 0);
}
static inline size_t guehdr_priv_flags_len(__be32 flags)
{
return 0;
}
/* Validate standard and private flags. Returns non-zero (meaning invalid)
* if there is an unknown standard or private flags, or the options length for
* the flags exceeds the options length specific in hlen of the GUE header.
*/
static inline int validate_gue_flags(struct guehdr *guehdr,
size_t optlen)
{
size_t len;
__be32 flags = guehdr->flags;
if (flags & ~GUE_FLAGS_ALL)
return 1;
len = guehdr_flags_len(flags);
if (len > optlen)
return 1;
if (flags & GUE_FLAG_PRIV) {
/* Private flags are last four bytes accounted in
* guehdr_flags_len
*/
flags = *(__be32 *)((void *)&guehdr[1] + len - GUE_LEN_PRIV);
if (flags & ~GUE_PFLAGS_ALL)
return 1;
len += guehdr_priv_flags_len(flags);
if (len > optlen)
return 1;
}
return 0;
}
#endif

144
net/ipv4/fou.c
View File

@ -38,21 +38,17 @@ static inline struct fou *fou_from_sock(struct sock *sk)
return sk->sk_user_data;
}
static int fou_udp_encap_recv_deliver(struct sk_buff *skb,
u8 protocol, size_t len)
static void fou_recv_pull(struct sk_buff *skb, size_t len)
{
struct iphdr *iph = ip_hdr(skb);
/* Remove 'len' bytes from the packet (UDP header and
* FOU header if present), modify the protocol to the one
* we found, and then call rcv_encap.
* FOU header if present).
*/
iph->tot_len = htons(ntohs(iph->tot_len) - len);
__skb_pull(skb, len);
skb_postpull_rcsum(skb, udp_hdr(skb), len);
skb_reset_transport_header(skb);
return -protocol;
}
static int fou_udp_recv(struct sock *sk, struct sk_buff *skb)
@ -62,16 +58,24 @@ static int fou_udp_recv(struct sock *sk, struct sk_buff *skb)
if (!fou)
return 1;
return fou_udp_encap_recv_deliver(skb, fou->protocol,
sizeof(struct udphdr));
fou_recv_pull(skb, sizeof(struct udphdr));
return -fou->protocol;
}
static int gue_control_message(struct sk_buff *skb, struct guehdr *guehdr)
{
/* No support yet */
kfree_skb(skb);
return 0;
}
static int gue_udp_recv(struct sock *sk, struct sk_buff *skb)
{
struct fou *fou = fou_from_sock(sk);
size_t len;
size_t len, optlen, hdrlen;
struct guehdr *guehdr;
struct udphdr *uh;
void *data;
if (!fou)
return 1;
@ -80,25 +84,38 @@ static int gue_udp_recv(struct sock *sk, struct sk_buff *skb)
if (!pskb_may_pull(skb, len))
goto drop;
uh = udp_hdr(skb);
guehdr = (struct guehdr *)&uh[1];
guehdr = (struct guehdr *)&udp_hdr(skb)[1];
optlen = guehdr->hlen << 2;
len += optlen;
len += guehdr->hlen << 2;
if (!pskb_may_pull(skb, len))
goto drop;
uh = udp_hdr(skb);
guehdr = (struct guehdr *)&uh[1];
/* guehdr may change after pull */
guehdr = (struct guehdr *)&udp_hdr(skb)[1];
if (guehdr->version != 0)
hdrlen = sizeof(struct guehdr) + optlen;
if (guehdr->version != 0 || validate_gue_flags(guehdr, optlen))
goto drop;
if (guehdr->flags) {
/* No support yet */
goto drop;
/* Pull UDP and GUE headers */
fou_recv_pull(skb, len);
data = &guehdr[1];
if (guehdr->flags & GUE_FLAG_PRIV) {
data += GUE_LEN_PRIV;
/* Process private flags */
}
return fou_udp_encap_recv_deliver(skb, guehdr->next_hdr, len);
if (unlikely(guehdr->control))
return gue_control_message(skb, guehdr);
return -guehdr->proto_ctype;
drop:
kfree_skb(skb);
return 0;
@ -154,36 +171,47 @@ static struct sk_buff **gue_gro_receive(struct sk_buff **head,
const struct net_offload *ops;
struct sk_buff **pp = NULL;
struct sk_buff *p;
u8 proto;
struct guehdr *guehdr;
unsigned int hlen, guehlen;
unsigned int off;
size_t len, optlen, hdrlen, off;
void *data;
int flush = 1;
off = skb_gro_offset(skb);
hlen = off + sizeof(*guehdr);
len = off + sizeof(*guehdr);
guehdr = skb_gro_header_fast(skb, off);
if (skb_gro_header_hard(skb, hlen)) {
guehdr = skb_gro_header_slow(skb, hlen, off);
if (skb_gro_header_hard(skb, len)) {
guehdr = skb_gro_header_slow(skb, len, off);
if (unlikely(!guehdr))
goto out;
}
proto = guehdr->next_hdr;
optlen = guehdr->hlen << 2;
len += optlen;
rcu_read_lock();
offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
ops = rcu_dereference(offloads[proto]);
if (WARN_ON(!ops || !ops->callbacks.gro_receive))
goto out_unlock;
guehlen = sizeof(*guehdr) + (guehdr->hlen << 2);
hlen = off + guehlen;
if (skb_gro_header_hard(skb, hlen)) {
guehdr = skb_gro_header_slow(skb, hlen, off);
if (skb_gro_header_hard(skb, len)) {
guehdr = skb_gro_header_slow(skb, len, off);
if (unlikely(!guehdr))
goto out_unlock;
goto out;
}
if (unlikely(guehdr->control) || guehdr->version != 0 ||
validate_gue_flags(guehdr, optlen))
goto out;
hdrlen = sizeof(*guehdr) + optlen;
skb_gro_pull(skb, hdrlen);
/* Adjusted NAPI_GRO_CB(skb)->csum after skb_gro_pull()*/
skb_gro_postpull_rcsum(skb, guehdr, hdrlen);
data = &guehdr[1];
if (guehdr->flags & GUE_FLAG_PRIV) {
data += GUE_LEN_PRIV;
/* Process private flags */
}
flush = 0;
@ -197,7 +225,7 @@ static struct sk_buff **gue_gro_receive(struct sk_buff **head,
guehdr2 = (struct guehdr *)(p->data + off);
/* Compare base GUE header to be equal (covers
* hlen, version, next_hdr, and flags.
* hlen, version, proto_ctype, and flags.
*/
if (guehdr->word != guehdr2->word) {
NAPI_GRO_CB(p)->same_flow = 0;
@ -212,10 +240,11 @@ static struct sk_buff **gue_gro_receive(struct sk_buff **head,
}
}
skb_gro_pull(skb, guehlen);
/* Adjusted NAPI_GRO_CB(skb)->csum after skb_gro_pull()*/
skb_gro_postpull_rcsum(skb, guehdr, guehlen);
rcu_read_lock();
offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
ops = rcu_dereference(offloads[guehdr->proto_ctype]);
if (WARN_ON(!ops || !ops->callbacks.gro_receive))
goto out_unlock;
pp = ops->callbacks.gro_receive(head, skb);
@ -236,7 +265,7 @@ static int gue_gro_complete(struct sk_buff *skb, int nhoff)
u8 proto;
int err = -ENOENT;
proto = guehdr->next_hdr;
proto = guehdr->proto_ctype;
guehlen = sizeof(*guehdr) + (guehdr->hlen << 2);
@ -533,8 +562,12 @@ int gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
bool csum = !!(e->flags & TUNNEL_ENCAP_FLAG_CSUM);
int type = csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
struct guehdr *guehdr;
size_t hdr_len = sizeof(struct guehdr);
size_t optlen = 0;
__be16 sport;
void *data;
bool need_priv = false;
optlen += need_priv ? GUE_LEN_PRIV : 0;
skb = iptunnel_handle_offloads(skb, csum, type);
@ -545,14 +578,27 @@ int gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev),
skb, 0, 0, false);
skb_push(skb, hdr_len);
skb_push(skb, sizeof(struct guehdr) + optlen);
guehdr = (struct guehdr *)skb->data;
guehdr->control = 0;
guehdr->version = 0;
guehdr->hlen = 0;
guehdr->hlen = optlen >> 2;
guehdr->flags = 0;
guehdr->next_hdr = *protocol;
guehdr->proto_ctype = *protocol;
data = &guehdr[1];
if (need_priv) {
__be32 *flags = data;
guehdr->flags |= GUE_FLAG_PRIV;
*flags = 0;
data += GUE_LEN_PRIV;
/* Add private flags */
}
fou_build_udp(skb, e, fl4, protocol, sport);