static struct sk_buff *tnl_skb_gso_segment(struct sk_buff *skb,
netdev_features_t features,
bool tx_path)
{
struct iphdr *iph = ip_hdr(skb);
int pkt_hlen = skb_inner_network_offset(skb); /* inner l2 + tunnel hdr. */
int mac_offset = skb_inner_mac_offset(skb);
struct sk_buff *skb1 = skb;
struct sk_buff *segs;
__be16 proto = skb->protocol;
char cb[sizeof(skb->cb)];
/* setup whole inner packet to get protocol. */
__skb_pull(skb, mac_offset);
skb->protocol = __skb_network_protocol(skb);
/* setup l3 packet to gso, to get around segmentation bug on older kernel.*/
__skb_pull(skb, (pkt_hlen - mac_offset));
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
skb_reset_transport_header(skb);
/* From 3.9 kernel skb->cb is used by skb gso. Therefore
* make copy of it to restore it back. */
memcpy(cb, skb->cb, sizeof(cb));
segs = __skb_gso_segment(skb, 0, tx_path);
if (!segs || IS_ERR(segs))
goto free;
skb = segs;
while (skb) {
__skb_push(skb, pkt_hlen);
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
skb_set_transport_header(skb, sizeof(struct iphdr));
skb->mac_len = 0;
memcpy(ip_hdr(skb), iph, pkt_hlen);
memcpy(skb->cb, cb, sizeof(cb));
if (OVS_GSO_CB(skb)->fix_segment)
OVS_GSO_CB(skb)->fix_segment(skb);
skb->protocol = proto;
skb = skb->next;
}
free:
consume_skb(skb1);
return segs;
}
static struct sk_buff *tnl_skb_gso_segment(struct sk_buff *skb,
netdev_features_t features,
bool tx_path,
sa_family_t sa_family)
{
void *iph = skb_network_header(skb);
int pkt_hlen = skb_inner_network_offset(skb); /* inner l2 + tunnel hdr. */
int mac_offset = skb_inner_mac_offset(skb);
int outer_l3_offset = skb_network_offset(skb);
int outer_l4_offset = skb_transport_offset(skb);
struct sk_buff *skb1 = skb;
struct dst_entry *dst = skb_dst(skb);
struct sk_buff *segs;
__be16 proto = skb->protocol;
char cb[sizeof(skb->cb)];
BUILD_BUG_ON(sizeof(struct ovs_gso_cb) > FIELD_SIZEOF(struct sk_buff, cb));
OVS_GSO_CB(skb)->ipv6 = (sa_family == AF_INET6);
/* setup whole inner packet to get protocol. */
__skb_pull(skb, mac_offset);
skb->protocol = __skb_network_protocol(skb);
/* setup l3 packet to gso, to get around segmentation bug on older kernel.*/
__skb_pull(skb, (pkt_hlen - mac_offset));
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
skb_reset_transport_header(skb);
/* From 3.9 kernel skb->cb is used by skb gso. Therefore
* make copy of it to restore it back. */
memcpy(cb, skb->cb, sizeof(cb));
skb->encapsulation = 0;
/* We are handling offloads by segmenting l3 packet, so
* no need to call OVS compat segmentation function. */
#ifdef HAVE___SKB_GSO_SEGMENT
#undef __skb_gso_segment
segs = __skb_gso_segment(skb, 0, tx_path);
#else
#undef skb_gso_segment
segs = skb_gso_segment(skb, 0);
#endif
if (!segs || IS_ERR(segs))
goto free;
skb = segs;
while (skb) {
__skb_push(skb, pkt_hlen);
skb_reset_mac_header(skb);
skb_set_network_header(skb, outer_l3_offset);
skb_set_transport_header(skb, outer_l4_offset);
skb->mac_len = 0;
memcpy(skb_network_header(skb), iph, pkt_hlen);
memcpy(skb->cb, cb, sizeof(cb));
skb->protocol = proto;
if (skb->next)
dst = dst_clone(dst);
skb_dst_set(skb, dst);
OVS_GSO_CB(skb)->fix_segment(skb);
skb = skb->next;
}
free:
consume_skb(skb1);
return segs;
}
