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Merge branch 'bpf-next' 

Daniel Borkmann says:

====================
BPF update

This set adds IPv6 support for bpf_skb_{set,get}_tunnel_key() helper.
It also exports flags to user space that are being used in helpers and
weren't exported thus far. For more details, please see the individual
patches.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2016-01-11 17:32:56 -05:00
parent c8086f6d88 c6c3345407
commit 23c09c2640
2 changed files with 110 additions and 22 deletions
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26
include/uapi/linux/bpf.h
View File

@ -273,6 +273,25 @@ enum bpf_func_id {
__BPF_FUNC_MAX_ID,
};
/* All flags used by eBPF helper functions, placed here. */
/* BPF_FUNC_skb_store_bytes flags. */
#define BPF_F_RECOMPUTE_CSUM (1ULL << 0)
/* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags.
* First 4 bits are for passing the header field size.
*/
#define BPF_F_HDR_FIELD_MASK 0xfULL
/* BPF_FUNC_l4_csum_replace flags. */
#define BPF_F_PSEUDO_HDR (1ULL << 4)
/* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */
#define BPF_F_INGRESS (1ULL << 0)
/* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */
#define BPF_F_TUNINFO_IPV6 (1ULL << 0)
/* user accessible mirror of in-kernel sk_buff.
* new fields can only be added to the end of this structure
*/
@ -296,7 +315,12 @@ struct __sk_buff {
struct bpf_tunnel_key {
__u32 tunnel_id;
__u32 remote_ipv4;
union {
__u32 remote_ipv4;
__u32 remote_ipv6[4];
};
__u8 tunnel_tos;
__u8 tunnel_ttl;
};
#endif /* _UAPI__LINUX_BPF_H__ */

106
net/core/filter.c
View File

@ -1328,8 +1328,7 @@ int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk)
return 0;
}
#define BPF_RECOMPUTE_CSUM(flags) ((flags) & 1)
#define BPF_LDST_LEN 16U
#define BPF_LDST_LEN 16U
static u64 bpf_skb_store_bytes(u64 r1, u64 r2, u64 r3, u64 r4, u64 flags)
{
@ -1340,6 +1339,9 @@ static u64 bpf_skb_store_bytes(u64 r1, u64 r2, u64 r3, u64 r4, u64 flags)
char buf[BPF_LDST_LEN];
void *ptr;
if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM)))
return -EINVAL;
/* bpf verifier guarantees that:
* 'from' pointer points to bpf program stack
* 'len' bytes of it were initialized
@ -1359,7 +1361,7 @@ static u64 bpf_skb_store_bytes(u64 r1, u64 r2, u64 r3, u64 r4, u64 flags)
if (unlikely(!ptr))
return -EFAULT;
if (BPF_RECOMPUTE_CSUM(flags))
if (flags & BPF_F_RECOMPUTE_CSUM)
skb_postpull_rcsum(skb, ptr, len);
memcpy(ptr, from, len);
@ -1368,7 +1370,7 @@ static u64 bpf_skb_store_bytes(u64 r1, u64 r2, u64 r3, u64 r4, u64 flags)
/* skb_store_bits cannot return -EFAULT here */
skb_store_bits(skb, offset, ptr, len);
if (BPF_RECOMPUTE_CSUM(flags))
if (flags & BPF_F_RECOMPUTE_CSUM)
skb_postpush_rcsum(skb, ptr, len);
return 0;
@ -1415,15 +1417,14 @@ const struct bpf_func_proto bpf_skb_load_bytes_proto = {
.arg4_type = ARG_CONST_STACK_SIZE,
};
#define BPF_HEADER_FIELD_SIZE(flags) ((flags) & 0x0f)
#define BPF_IS_PSEUDO_HEADER(flags) ((flags) & 0x10)
static u64 bpf_l3_csum_replace(u64 r1, u64 r2, u64 from, u64 to, u64 flags)
{
struct sk_buff *skb = (struct sk_buff *) (long) r1;
int offset = (int) r2;
__sum16 sum, *ptr;
if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK)))
return -EINVAL;
if (unlikely((u32) offset > 0xffff))
return -EFAULT;
@ -1435,7 +1436,7 @@ static u64 bpf_l3_csum_replace(u64 r1, u64 r2, u64 from, u64 to, u64 flags)
if (unlikely(!ptr))
return -EFAULT;
switch (BPF_HEADER_FIELD_SIZE(flags)) {
switch (flags & BPF_F_HDR_FIELD_MASK) {
case 2:
csum_replace2(ptr, from, to);
break;
@ -1467,10 +1468,12 @@ const struct bpf_func_proto bpf_l3_csum_replace_proto = {
static u64 bpf_l4_csum_replace(u64 r1, u64 r2, u64 from, u64 to, u64 flags)
{
struct sk_buff *skb = (struct sk_buff *) (long) r1;
bool is_pseudo = !!BPF_IS_PSEUDO_HEADER(flags);
bool is_pseudo = flags & BPF_F_PSEUDO_HDR;
int offset = (int) r2;
__sum16 sum, *ptr;
if (unlikely(flags & ~(BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK)))
return -EINVAL;
if (unlikely((u32) offset > 0xffff))
return -EFAULT;
@ -1482,7 +1485,7 @@ static u64 bpf_l4_csum_replace(u64 r1, u64 r2, u64 from, u64 to, u64 flags)
if (unlikely(!ptr))
return -EFAULT;
switch (BPF_HEADER_FIELD_SIZE(flags)) {
switch (flags & BPF_F_HDR_FIELD_MASK) {
case 2:
inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo);
break;
@ -1511,13 +1514,14 @@ const struct bpf_func_proto bpf_l4_csum_replace_proto = {
.arg5_type = ARG_ANYTHING,
};
#define BPF_IS_REDIRECT_INGRESS(flags) ((flags) & 1)
static u64 bpf_clone_redirect(u64 r1, u64 ifindex, u64 flags, u64 r4, u64 r5)
{
struct sk_buff *skb = (struct sk_buff *) (long) r1, *skb2;
struct net_device *dev;
if (unlikely(flags & ~(BPF_F_INGRESS)))
return -EINVAL;
dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex);
if (unlikely(!dev))
return -EINVAL;
@ -1526,7 +1530,7 @@ static u64 bpf_clone_redirect(u64 r1, u64 ifindex, u64 flags, u64 r4, u64 r5)
if (unlikely(!skb2))
return -ENOMEM;
if (BPF_IS_REDIRECT_INGRESS(flags)) {
if (flags & BPF_F_INGRESS) {
if (skb_at_tc_ingress(skb2))
skb_postpush_rcsum(skb2, skb_mac_header(skb2),
skb2->mac_len);
@ -1553,12 +1557,17 @@ struct redirect_info {
};
static DEFINE_PER_CPU(struct redirect_info, redirect_info);
static u64 bpf_redirect(u64 ifindex, u64 flags, u64 r3, u64 r4, u64 r5)
{
struct redirect_info *ri = this_cpu_ptr(&redirect_info);
if (unlikely(flags & ~(BPF_F_INGRESS)))
return TC_ACT_SHOT;
ri->ifindex = ifindex;
ri->flags = flags;
return TC_ACT_REDIRECT;
}
@ -1574,7 +1583,7 @@ int skb_do_redirect(struct sk_buff *skb)
return -EINVAL;
}
if (BPF_IS_REDIRECT_INGRESS(ri->flags)) {
if (ri->flags & BPF_F_INGRESS) {
if (skb_at_tc_ingress(skb))
skb_postpush_rcsum(skb, skb_mac_header(skb),
skb->mac_len);
@ -1671,19 +1680,49 @@ bool bpf_helper_changes_skb_data(void *func)
return false;
}
static unsigned short bpf_tunnel_key_af(u64 flags)
{
return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET;
}
static u64 bpf_skb_get_tunnel_key(u64 r1, u64 r2, u64 size, u64 flags, u64 r5)
{
struct sk_buff *skb = (struct sk_buff *) (long) r1;
struct bpf_tunnel_key *to = (struct bpf_tunnel_key *) (long) r2;
struct ip_tunnel_info *info = skb_tunnel_info(skb);
const struct ip_tunnel_info *info = skb_tunnel_info(skb);
u8 compat[sizeof(struct bpf_tunnel_key)];
if (unlikely(size != sizeof(struct bpf_tunnel_key) || flags || !info))
return -EINVAL;
if (ip_tunnel_info_af(info) != AF_INET)
if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6))))
return -EINVAL;
if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags))
return -EPROTO;
if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
switch (size) {
case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
/* Fixup deprecated structure layouts here, so we have
* a common path later on.
*/
if (ip_tunnel_info_af(info) != AF_INET)
return -EINVAL;
to = (struct bpf_tunnel_key *)compat;
break;
default:
return -EINVAL;
}
}
to->tunnel_id = be64_to_cpu(info->key.tun_id);
to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src);
to->tunnel_tos = info->key.tos;
to->tunnel_ttl = info->key.ttl;
if (flags & BPF_F_TUNINFO_IPV6)
memcpy(to->remote_ipv6, &info->key.u.ipv6.src,
sizeof(to->remote_ipv6));
else
to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src);
if (unlikely(size != sizeof(struct bpf_tunnel_key)))
memcpy((void *)(long) r2, to, size);
return 0;
}
@ -1705,10 +1744,25 @@ static u64 bpf_skb_set_tunnel_key(u64 r1, u64 r2, u64 size, u64 flags, u64 r5)
struct sk_buff *skb = (struct sk_buff *) (long) r1;
struct bpf_tunnel_key *from = (struct bpf_tunnel_key *) (long) r2;
struct metadata_dst *md = this_cpu_ptr(md_dst);
u8 compat[sizeof(struct bpf_tunnel_key)];
struct ip_tunnel_info *info;
if (unlikely(size != sizeof(struct bpf_tunnel_key) || flags))
if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6)))
return -EINVAL;
if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
switch (size) {
case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
/* Fixup deprecated structure layouts here, so we have
* a common path later on.
*/
memcpy(compat, from, size);
memset(compat + size, 0, sizeof(compat) - size);
from = (struct bpf_tunnel_key *)compat;
break;
default:
return -EINVAL;
}
}
skb_dst_drop(skb);
dst_hold((struct dst_entry *) md);
@ -1716,9 +1770,19 @@ static u64 bpf_skb_set_tunnel_key(u64 r1, u64 r2, u64 size, u64 flags, u64 r5)
info = &md->u.tun_info;
info->mode = IP_TUNNEL_INFO_TX;
info->key.tun_flags = TUNNEL_KEY;
info->key.tun_id = cpu_to_be64(from->tunnel_id);
info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4);
info->key.tos = from->tunnel_tos;
info->key.ttl = from->tunnel_ttl;
if (flags & BPF_F_TUNINFO_IPV6) {
info->mode |= IP_TUNNEL_INFO_IPV6;
memcpy(&info->key.u.ipv6.dst, from->remote_ipv6,
sizeof(from->remote_ipv6));
} else {
info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4);
}
return 0;
}