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xfrm: Separate ESP handling from segmentation for GRO packets.

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We change the ESP GSO handlers to only segment the packets.
The ESP handling and encryption is defered to validate_xmit_xfrm()
where this is done for non GRO packets too. This makes the code
more robust and prepares for asynchronous crypto handling.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert
2017-12-20 10:41:31 +01:00
parent f39a5c01c3
commit 3dca3f38cf
7 changed files with 129 additions and 132 deletions
Download Patch File Download Diff File Expand all files Collapse all files

73
net/ipv4/esp4_offload.c
View File

@@ -108,75 +108,36 @@ static void esp4_gso_encap(struct xfrm_state *x, struct sk_buff *skb)
static struct sk_buff *esp4_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
__u32 seq;
int err = 0;
struct sk_buff *skb2;
struct xfrm_state *x;
struct ip_esp_hdr *esph;
struct crypto_aead *aead;
struct sk_buff *segs = ERR_PTR(-EINVAL);
netdev_features_t esp_features = features;
struct xfrm_offload *xo = xfrm_offload(skb);
if (!xo)
goto out;
seq = xo->seq.low;
return ERR_PTR(-EINVAL);
x = skb->sp->xvec[skb->sp->len - 1];
aead = x->data;
esph = ip_esp_hdr(skb);
if (esph->spi != x->id.spi)
goto out;
return ERR_PTR(-EINVAL);
if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
goto out;
return ERR_PTR(-EINVAL);
__skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead));
skb->encap_hdr_csum = 1;
if (!(features & NETIF_F_HW_ESP))
if (!(features & NETIF_F_HW_ESP) || !x->xso.offload_handle ||
(x->xso.dev != skb->dev))
esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);
segs = x->outer_mode->gso_segment(x, skb, esp_features);
if (IS_ERR_OR_NULL(segs))
goto out;
xo->flags |= XFRM_GSO_SEGMENT;
__skb_pull(skb, skb->data - skb_mac_header(skb));
skb2 = segs;
do {
struct sk_buff *nskb = skb2->next;
xo = xfrm_offload(skb2);
xo->flags |= XFRM_GSO_SEGMENT;
xo->seq.low = seq;
xo->seq.hi = xfrm_replay_seqhi(x, seq);
if(!(features & NETIF_F_HW_ESP))
xo->flags |= CRYPTO_FALLBACK;
x->outer_mode->xmit(x, skb2);
err = x->type_offload->xmit(x, skb2, esp_features);
if (err) {
kfree_skb_list(segs);
return ERR_PTR(err);
}
if (!skb_is_gso(skb2))
seq++;
else
seq += skb_shinfo(skb2)->gso_segs;
skb_push(skb2, skb2->mac_len);
skb2 = nskb;
} while (skb2);
out:
return segs;
return x->outer_mode->gso_segment(x, skb, esp_features);
}
static int esp_input_tail(struct xfrm_state *x, struct sk_buff *skb)
@@ -203,6 +164,7 @@ static int esp_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_
struct crypto_aead *aead;
struct esp_info esp;
bool hw_offload = true;
__u32 seq;
esp.inplace = true;
@@ -241,23 +203,30 @@ static int esp_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_
return esp.nfrags;
}
seq = xo->seq.low;
esph = esp.esph;
esph->spi = x->id.spi;
skb_push(skb, -skb_network_offset(skb));
if (xo->flags & XFRM_GSO_SEGMENT) {
esph->seq_no = htonl(xo->seq.low);
} else {
ip_hdr(skb)->tot_len = htons(skb->len);
ip_send_check(ip_hdr(skb));
esph->seq_no = htonl(seq);
if (!skb_is_gso(skb))
xo->seq.low++;
else
xo->seq.low += skb_shinfo(skb)->gso_segs;
}
esp.seqno = cpu_to_be64(seq + ((u64)xo->seq.hi << 32));
ip_hdr(skb)->tot_len = htons(skb->len);
ip_send_check(ip_hdr(skb));
if (hw_offload)
return 0;
esp.seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32));
err = esp_output_tail(x, skb, &esp);
if (err)
return err;