From 5edbb07dc9474b7d4cd4391a2e6551ad067a0f96 Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Thu, 15 Nov 2012 08:49:18 +0000 Subject: 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 Signed-off-by: David S. Miller --- net/ipv6/udp.c | 104 +++------------------------------------------------------ 1 file changed, 4 insertions(+), 100 deletions(-) (limited to 'net/ipv6/udp.c') diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index e4cc1f41012d..013fef740d51 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -50,6 +50,7 @@ #include #include #include "udp_impl.h" +#include "ip6_offload.h" int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) { @@ -1343,109 +1344,12 @@ int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, } #endif -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 inet6_protocol udpv6_protocol = { .handler = udpv6_rcv, .err_handler = udpv6_err, .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, }; -static const struct net_offload udpv6_offload = { - .gso_send_check = udp6_ufo_send_check, - .gso_segment = udp6_ufo_fragment, -}; - /* ------------------------------------------------------------------------ */ #ifdef CONFIG_PROC_FS @@ -1568,7 +1472,7 @@ int __init udpv6_init(void) { int ret; - ret = inet6_add_offload(&udpv6_offload, IPPROTO_UDP); + ret = udp_offload_init(); if (ret) goto out; @@ -1585,7 +1489,7 @@ out: out_udpv6_protocol: inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); out_offload: - inet6_del_offload(&udpv6_offload, IPPROTO_UDP); + udp_offload_cleanup(); goto out; } @@ -1593,5 +1497,5 @@ void udpv6_exit(void) { inet6_unregister_protosw(&udpv6_protosw); inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); - inet6_del_offload(&udpv6_offload, IPPROTO_UDP); + udp_offload_cleanup(); } -- cgit v1.2.3