* UDPv6 GSO support
*/
#include <linux/skbuff.h>
+#include <linux/netdevice.h>
#include <net/protocol.h>
#include <net/ipv6.h>
#include <net/udp.h>
#include <net/ip6_checksum.h>
#include "ip6_offload.h"
-static int udp6_ufo_send_check(struct sk_buff *skb)
-{
- const struct ipv6hdr *ipv6h;
- struct udphdr *uh;
-
- /* UDP Tunnel offload on ipv6 is not yet supported. */
- if (skb->encapsulation)
- return -EINVAL;
-
- if (!pskb_may_pull(skb, sizeof(*uh)))
- return -EINVAL;
-
- ipv6h = ipv6_hdr(skb);
- uh = udp_hdr(skb);
-
- uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
- IPPROTO_UDP, 0);
- skb->csum_start = skb_transport_header(skb) - skb->head;
- skb->csum_offset = offsetof(struct udphdr, check);
- skb->ip_summed = CHECKSUM_PARTIAL;
- return 0;
-}
-
static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
- netdev_features_t features)
+ netdev_features_t features)
{
struct sk_buff *segs = ERR_PTR(-EINVAL);
unsigned int mss;
u8 *packet_start, *prevhdr;
u8 nexthdr;
u8 frag_hdr_sz = sizeof(struct frag_hdr);
- int offset;
__wsum csum;
int tnl_hlen;
if (unlikely(type & ~(SKB_GSO_UDP |
SKB_GSO_DODGY |
SKB_GSO_UDP_TUNNEL |
- SKB_GSO_GRE) ||
+ SKB_GSO_UDP_TUNNEL_CSUM |
+ SKB_GSO_TUNNEL_REMCSUM |
+ SKB_GSO_GRE |
+ SKB_GSO_GRE_CSUM |
+ SKB_GSO_IPIP |
+ SKB_GSO_SIT) ||
!(type & (SKB_GSO_UDP))))
goto out;
skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
+ /* Set the IPv6 fragment id if not set yet */
+ if (!skb_shinfo(skb)->ip6_frag_id)
+ ipv6_proxy_select_ident(dev_net(skb->dev), skb);
+
segs = NULL;
goto out;
}
- /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
- * do checksum of UDP packets sent as multiple IP fragments.
- */
- offset = skb_checksum_start_offset(skb);
- csum = skb_checksum(skb, offset, skb->len - offset, 0);
- offset += skb->csum_offset;
- *(__sum16 *)(skb->data + offset) = csum_fold(csum);
- skb->ip_summed = CHECKSUM_NONE;
-
- /* Check if there is enough headroom to insert fragment header. */
- tnl_hlen = skb_tnl_header_len(skb);
- if (skb_mac_header(skb) < skb->head + tnl_hlen + frag_hdr_sz) {
- if (gso_pskb_expand_head(skb, tnl_hlen + frag_hdr_sz))
+ if (skb->encapsulation && skb_shinfo(skb)->gso_type &
+ (SKB_GSO_UDP_TUNNEL|SKB_GSO_UDP_TUNNEL_CSUM))
+ segs = skb_udp_tunnel_segment(skb, features, true);
+ else {
+ const struct ipv6hdr *ipv6h;
+ struct udphdr *uh;
+
+ if (!pskb_may_pull(skb, sizeof(struct udphdr)))
goto out;
- }
- /* Find the unfragmentable header and shift it left by frag_hdr_sz
- * bytes to insert fragment header.
- */
- unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
- nexthdr = *prevhdr;
- *prevhdr = NEXTHDR_FRAGMENT;
- unfrag_len = (skb_network_header(skb) - skb_mac_header(skb)) +
- unfrag_ip6hlen + tnl_hlen;
- packet_start = (u8 *) skb->head + SKB_GSO_CB(skb)->mac_offset;
- memmove(packet_start-frag_hdr_sz, packet_start, unfrag_len);
-
- SKB_GSO_CB(skb)->mac_offset -= frag_hdr_sz;
- skb->mac_header -= frag_hdr_sz;
- skb->network_header -= frag_hdr_sz;
-
- fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
- fptr->nexthdr = nexthdr;
- fptr->reserved = 0;
- fptr->identification = skb_shinfo(skb)->ip6_frag_id;
-
- /* Fragment the skb. ipv6 header and the remaining fields of the
- * fragment header are updated in ipv6_gso_segment()
- */
- segs = skb_segment(skb, features);
+ /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
+ * do checksum of UDP packets sent as multiple IP fragments.
+ */
+
+ uh = udp_hdr(skb);
+ ipv6h = ipv6_hdr(skb);
+
+ uh->check = 0;
+ csum = skb_checksum(skb, 0, skb->len, 0);
+ uh->check = udp_v6_check(skb->len, &ipv6h->saddr,
+ &ipv6h->daddr, csum);
+
+ if (uh->check == 0)
+ uh->check = CSUM_MANGLED_0;
+
+ skb->ip_summed = CHECKSUM_NONE;
+
+ /* Check if there is enough headroom to insert fragment header. */
+ tnl_hlen = skb_tnl_header_len(skb);
+ if (skb->mac_header < (tnl_hlen + frag_hdr_sz)) {
+ if (gso_pskb_expand_head(skb, tnl_hlen + frag_hdr_sz))
+ goto out;
+ }
+
+ /* Find the unfragmentable header and shift it left by frag_hdr_sz
+ * bytes to insert fragment header.
+ */
+ unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
+ nexthdr = *prevhdr;
+ *prevhdr = NEXTHDR_FRAGMENT;
+ unfrag_len = (skb_network_header(skb) - skb_mac_header(skb)) +
+ unfrag_ip6hlen + tnl_hlen;
+ packet_start = (u8 *) skb->head + SKB_GSO_CB(skb)->mac_offset;
+ memmove(packet_start-frag_hdr_sz, packet_start, unfrag_len);
+
+ SKB_GSO_CB(skb)->mac_offset -= frag_hdr_sz;
+ skb->mac_header -= frag_hdr_sz;
+ skb->network_header -= frag_hdr_sz;
+
+ fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
+ fptr->nexthdr = nexthdr;
+ fptr->reserved = 0;
+ if (!skb_shinfo(skb)->ip6_frag_id)
+ ipv6_proxy_select_ident(dev_net(skb->dev), skb);
+ fptr->identification = skb_shinfo(skb)->ip6_frag_id;
+
+ /* Fragment the skb. ipv6 header and the remaining fields of the
+ * fragment header are updated in ipv6_gso_segment()
+ */
+ segs = skb_segment(skb, features);
+ }
out:
return segs;
}
+
+static struct sk_buff **udp6_gro_receive(struct sk_buff **head,
+ struct sk_buff *skb)
+{
+ struct udphdr *uh = udp_gro_udphdr(skb);
+
+ if (unlikely(!uh))
+ goto flush;
+
+ /* Don't bother verifying checksum if we're going to flush anyway. */
+ if (NAPI_GRO_CB(skb)->flush)
+ goto skip;
+
+ if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
+ ip6_gro_compute_pseudo))
+ goto flush;
+ else if (uh->check)
+ skb_gro_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
+ ip6_gro_compute_pseudo);
+
+skip:
+ NAPI_GRO_CB(skb)->is_ipv6 = 1;
+ return udp_gro_receive(head, skb, uh);
+
+flush:
+ NAPI_GRO_CB(skb)->flush = 1;
+ return NULL;
+}
+
+static int udp6_gro_complete(struct sk_buff *skb, int nhoff)
+{
+ const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
+
+ if (uh->check) {
+ skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM;
+ uh->check = ~udp_v6_check(skb->len - nhoff, &ipv6h->saddr,
+ &ipv6h->daddr, 0);
+ } else {
+ skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
+ }
+
+ return udp_gro_complete(skb, nhoff);
+}
+
static const struct net_offload udpv6_offload = {
.callbacks = {
- .gso_send_check = udp6_ufo_send_check,
.gso_segment = udp6_ufo_fragment,
+ .gro_receive = udp6_gro_receive,
+ .gro_complete = udp6_gro_complete,
},
};
projects / firefly-linux-kernel-4.4.55.git / blobdiff