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net: udp4: move GSO functions to udp_offload
Similarly to TCP offloading and UDPv6 offloading, move all related UDPv4 functions to udp_offload.c to make things more explicit. Also, by this, we can make those functions static. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| /* | ||
| * IPV4 GSO/GRO offload support | ||
| * Linux INET implementation | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License | ||
| * as published by the Free Software Foundation; either version | ||
| * 2 of the License, or (at your option) any later version. | ||
| * | ||
| * UDPv4 GSO support | ||
| */ | ||
|
|
||
| #include <linux/skbuff.h> | ||
| #include <net/udp.h> | ||
| #include <net/protocol.h> | ||
|
|
||
| static int udp4_ufo_send_check(struct sk_buff *skb) | ||
| { | ||
| if (!pskb_may_pull(skb, sizeof(struct udphdr))) | ||
| return -EINVAL; | ||
|
|
||
| if (likely(!skb->encapsulation)) { | ||
| const struct iphdr *iph; | ||
| struct udphdr *uh; | ||
|
|
||
| iph = ip_hdr(skb); | ||
| uh = udp_hdr(skb); | ||
|
|
||
| uh->check = ~csum_tcpudp_magic(iph->saddr, iph->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 *udp4_ufo_fragment(struct sk_buff *skb, | ||
| netdev_features_t features) | ||
| { | ||
| struct sk_buff *segs = ERR_PTR(-EINVAL); | ||
| unsigned int mss; | ||
|
|
||
| mss = skb_shinfo(skb)->gso_size; | ||
| if (unlikely(skb->len <= mss)) | ||
| goto out; | ||
|
|
||
| if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { | ||
| /* Packet is from an untrusted source, reset gso_segs. */ | ||
| int type = skb_shinfo(skb)->gso_type; | ||
|
|
||
| if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY | | ||
| SKB_GSO_UDP_TUNNEL | | ||
| SKB_GSO_GRE | SKB_GSO_MPLS) || | ||
| !(type & (SKB_GSO_UDP)))) | ||
| goto out; | ||
|
|
||
| skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); | ||
|
|
||
| segs = NULL; | ||
| goto out; | ||
| } | ||
|
|
||
| /* Fragment the skb. IP headers of the fragments are updated in | ||
| * inet_gso_segment() | ||
| */ | ||
| if (skb->encapsulation && skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL) | ||
| segs = skb_udp_tunnel_segment(skb, features); | ||
| else { | ||
| int offset; | ||
| __wsum csum; | ||
|
|
||
| /* 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; | ||
|
|
||
| segs = skb_segment(skb, features); | ||
| } | ||
| out: | ||
| return segs; | ||
| } | ||
|
|
||
| static const struct net_offload udpv4_offload = { | ||
| .callbacks = { | ||
| .gso_send_check = udp4_ufo_send_check, | ||
| .gso_segment = udp4_ufo_fragment, | ||
| }, | ||
| }; | ||
|
|
||
| int __init udpv4_offload_init(void) | ||
| { | ||
| return inet_add_offload(&udpv4_offload, IPPROTO_UDP); | ||
| } |