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ipv6: Separate out UDP offload functionality
Pull UDP GSO code into a separate file in preparation for moving the code out of the module. Signed-off-by: Vlad Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Vlad Yasevich
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David S. Miller
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Nov 15, 2012
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| /* | ||
| * IPV6 GSO/GRO offload support | ||
| * Linux INET6 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. | ||
| * | ||
| * UDPv6 GSO support | ||
| */ | ||
| #include <linux/skbuff.h> | ||
| #include <net/protocol.h> | ||
| #include <net/ipv6.h> | ||
| #include <net/udp.h> | ||
| #include "ip6_offload.h" | ||
|
|
||
| static int udp6_ufo_send_check(struct sk_buff *skb) | ||
| { | ||
| const struct ipv6hdr *ipv6h; | ||
| struct udphdr *uh; | ||
|
|
||
| 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) | ||
| { | ||
| struct sk_buff *segs = ERR_PTR(-EINVAL); | ||
| unsigned int mss; | ||
| unsigned int unfrag_ip6hlen, unfrag_len; | ||
| struct frag_hdr *fptr; | ||
| u8 *mac_start, *prevhdr; | ||
| u8 nexthdr; | ||
| u8 frag_hdr_sz = sizeof(struct frag_hdr); | ||
| int offset; | ||
| __wsum csum; | ||
|
|
||
| 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) || | ||
| !(type & (SKB_GSO_UDP)))) | ||
| goto out; | ||
|
|
||
| skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); | ||
|
|
||
| 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. */ | ||
| if ((skb_mac_header(skb) < skb->head + frag_hdr_sz) && | ||
| pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC)) | ||
| 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; | ||
| mac_start = skb_mac_header(skb); | ||
| memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len); | ||
|
|
||
| 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; | ||
| ipv6_select_ident(fptr, (struct rt6_info *)skb_dst(skb)); | ||
|
|
||
| /* 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 const struct net_offload udpv6_offload = { | ||
| .gso_send_check = udp6_ufo_send_check, | ||
| .gso_segment = udp6_ufo_fragment, | ||
| }; | ||
|
|
||
| int __init udp_offload_init(void) | ||
| { | ||
| return inet6_add_offload(&udpv6_offload, IPPROTO_UDP); | ||
| } | ||
|
|
||
| void udp_offload_cleanup(void) | ||
| { | ||
| inet6_del_offload(&udpv6_offload, IPPROTO_UDP); | ||
| } |