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Date: Thu, 20 Apr 2017 10:55:08 +0200
From: Steffen Klassert <steffen.klassert@...unet.com>
To: David Miller <davem@...emloft.net>
CC: Herbert Xu <herbert@...dor.apana.org.au>,
Steffen Klassert <steffen.klassert@...unet.com>,
<netdev@...r.kernel.org>
Subject: [PATCH 09/16] esp: Add gso handlers for esp4 and esp6
This patch extends the xfrm_type by an encap function pointer
and implements esp4_gso_encap and esp6_gso_encap. These functions
doing the basic esp encapsulation for a GSO packet. In case the
GSO packet needs to be segmented in software, we add gso_segment
functions. This codepath is going to be used on esp hardware
offloads.
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
net/ipv4/esp4.c | 10 +++++-
net/ipv4/esp4_offload.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++
net/ipv6/esp6.c | 8 +++--
net/ipv6/esp6_offload.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++
net/xfrm/xfrm_replay.c | 3 +-
5 files changed, 203 insertions(+), 4 deletions(-)
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 91e6a40..4382f30 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -161,11 +161,19 @@ static struct ip_esp_hdr *esp_output_set_extra(struct sk_buff *skb,
* encryption.
*/
if ((x->props.flags & XFRM_STATE_ESN)) {
+ __u32 seqhi;
+ struct xfrm_offload *xo = xfrm_offload(skb);
+
+ if (xo)
+ seqhi = xo->seq.hi;
+ else
+ seqhi = XFRM_SKB_CB(skb)->seq.output.hi;
+
extra->esphoff = (unsigned char *)esph -
skb_transport_header(skb);
esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4);
extra->seqhi = esph->spi;
- esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
+ esph->seq_no = htonl(seqhi);
}
esph->spi = x->id.spi;
diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c
index efaaa44..1e39564 100644
--- a/net/ipv4/esp4_offload.c
+++ b/net/ipv4/esp4_offload.c
@@ -84,6 +84,97 @@ static struct sk_buff **esp4_gro_receive(struct sk_buff **head,
return NULL;
}
+static void esp4_gso_encap(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct ip_esp_hdr *esph;
+ struct iphdr *iph = ip_hdr(skb);
+ struct xfrm_offload *xo = xfrm_offload(skb);
+ int proto = iph->protocol;
+
+ skb_push(skb, -skb_network_offset(skb));
+ esph = ip_esp_hdr(skb);
+ *skb_mac_header(skb) = IPPROTO_ESP;
+
+ esph->spi = x->id.spi;
+ esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
+
+ xo->proto = proto;
+}
+
+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;
+
+ x = skb->sp->xvec[skb->sp->len - 1];
+ aead = x->data;
+ esph = ip_esp_hdr(skb);
+
+ if (esph->spi != x->id.spi)
+ goto out;
+
+ if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
+ goto out;
+
+ __skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead));
+
+ skb->encap_hdr_csum = 1;
+
+ if (!(features & NETIF_F_HW_ESP))
+ 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;
+
+ __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;
+}
+
static int esp_input_tail(struct xfrm_state *x, struct sk_buff *skb)
{
struct crypto_aead *aead = x->data;
@@ -173,6 +264,7 @@ static int esp_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_
static const struct net_offload esp4_offload = {
.callbacks = {
.gro_receive = esp4_gro_receive,
+ .gso_segment = esp4_gso_segment,
},
};
@@ -182,6 +274,7 @@ static const struct xfrm_type_offload esp_type_offload = {
.proto = IPPROTO_ESP,
.input_tail = esp_input_tail,
.xmit = esp_xmit,
+ .encap = esp4_gso_encap,
};
static int __init esp4_offload_init(void)
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index cc654a7..82d3da8 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -179,9 +179,14 @@ static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb,
* encryption.
*/
if ((x->props.flags & XFRM_STATE_ESN)) {
+ struct xfrm_offload *xo = xfrm_offload(skb);
+
esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
*seqhi = esph->spi;
- esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
+ if (xo)
+ esph->seq_no = htonl(xo->seq.hi);
+ else
+ esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
}
esph->spi = x->id.spi;
@@ -223,7 +228,6 @@ int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info
struct sk_buff *trailer;
int tailen = esp->tailen;
- *skb_mac_header(skb) = IPPROTO_ESP;
esph = ip_esp_hdr(skb);
if (!skb_cloned(skb)) {
diff --git a/net/ipv6/esp6_offload.c b/net/ipv6/esp6_offload.c
index 5dd20c0..06e9721 100644
--- a/net/ipv6/esp6_offload.c
+++ b/net/ipv6/esp6_offload.c
@@ -86,6 +86,97 @@ static struct sk_buff **esp6_gro_receive(struct sk_buff **head,
return NULL;
}
+static void esp6_gso_encap(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct ip_esp_hdr *esph;
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct xfrm_offload *xo = xfrm_offload(skb);
+ int proto = iph->nexthdr;
+
+ skb_push(skb, -skb_network_offset(skb));
+ esph = ip_esp_hdr(skb);
+ *skb_mac_header(skb) = IPPROTO_ESP;
+
+ esph->spi = x->id.spi;
+ esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
+
+ xo->proto = proto;
+}
+
+static struct sk_buff *esp6_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;
+
+ x = skb->sp->xvec[skb->sp->len - 1];
+ aead = x->data;
+ esph = ip_esp_hdr(skb);
+
+ if (esph->spi != x->id.spi)
+ goto out;
+
+ if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
+ goto out;
+
+ __skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead));
+
+ skb->encap_hdr_csum = 1;
+
+ if (!(features & NETIF_F_HW_ESP))
+ 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;
+
+ __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;
+}
+
static int esp6_input_tail(struct xfrm_state *x, struct sk_buff *skb)
{
struct crypto_aead *aead = x->data;
@@ -176,6 +267,7 @@ static int esp6_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features
static const struct net_offload esp6_offload = {
.callbacks = {
.gro_receive = esp6_gro_receive,
+ .gso_segment = esp6_gso_segment,
},
};
@@ -185,6 +277,7 @@ static const struct xfrm_type_offload esp6_type_offload = {
.proto = IPPROTO_ESP,
.input_tail = esp6_input_tail,
.xmit = esp6_xmit,
+ .encap = esp6_gso_encap,
};
static int __init esp6_offload_init(void)
diff --git a/net/xfrm/xfrm_replay.c b/net/xfrm/xfrm_replay.c
index cdc2e2e..20e68a3 100644
--- a/net/xfrm/xfrm_replay.c
+++ b/net/xfrm/xfrm_replay.c
@@ -45,7 +45,8 @@ u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq)
return seq_hi;
}
-
+EXPORT_SYMBOL(xfrm_replay_seqhi);
+;
static void xfrm_replay_notify(struct xfrm_state *x, int event)
{
struct km_event c;
--
2.7.4
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