Commit da5bab07 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller
Browse files

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: default avatarDaniel Borkmann <dborkman@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 946d3bd7

include/net/udp.h

+4 −3
Original line number Diff line number Diff line
@@ -187,6 +187,8 @@ extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg); 
extern int udp_disconnect(struct sock *sk, int flags);

extern unsigned int udp_poll(struct file *file, struct socket *sock,

			     poll_table *wait);

extern struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,

					      netdev_features_t features);

extern int udp_lib_getsockopt(struct sock *sk, int level, int optname,

			      char __user *optval, int __user *optlen);

extern int udp_lib_setsockopt(struct sock *sk, int level, int optname,
@@ -262,11 +264,10 @@ extern int udp4_proc_init(void); 
extern void udp4_proc_exit(void);

#endif



extern int udpv4_offload_init(void);



extern void udp_init(void);



extern int udp4_ufo_send_check(struct sk_buff *skb);

extern struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,

	netdev_features_t features);

extern void udp_encap_enable(void);

#if IS_ENABLED(CONFIG_IPV6)

extern void udpv6_encap_enable(void);

net/ipv4/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -9,7 +9,7 @@ obj-y := route.o inetpeer.o protocol.o \ 
	     tcp.o tcp_input.o tcp_output.o tcp_timer.o tcp_ipv4.o \

	     tcp_minisocks.o tcp_cong.o tcp_metrics.o tcp_fastopen.o \

	     tcp_offload.o datagram.o raw.o udp.o udplite.o \

	     arp.o icmp.o devinet.o af_inet.o  igmp.o \

	     udp_offload.o arp.o icmp.o devinet.o af_inet.o igmp.o \

	     fib_frontend.o fib_semantics.o fib_trie.o \

	     inet_fragment.o ping.o

net/ipv4/af_inet.c

+1 −8
Original line number Diff line number Diff line
@@ -1566,13 +1566,6 @@ static const struct net_protocol udp_protocol = { 
	.netns_ok =	1,

};



static const struct net_offload udp_offload = {

	.callbacks = {

		.gso_send_check = udp4_ufo_send_check,

		.gso_segment = udp4_ufo_fragment,

	},

};



static const struct net_protocol icmp_protocol = {

	.handler =	icmp_rcv,

	.err_handler =	icmp_err,
@@ -1672,7 +1665,7 @@ static int __init ipv4_offload_init(void) 
	/*

	 * Add offloads

	 */

	if (inet_add_offload(&udp_offload, IPPROTO_UDP) < 0)

	if (udpv4_offload_init() < 0)

		pr_crit("%s: Cannot add UDP protocol offload\n", __func__);

	if (tcpv4_offload_init() < 0)

		pr_crit("%s: Cannot add TCP protocol offload\n", __func__);

net/ipv4/udp.c

+2 −73
Original line number Diff line number Diff line
@@ -2290,28 +2290,7 @@ void __init udp_init(void) 
	sysctl_udp_wmem_min = SK_MEM_QUANTUM;

}



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 *skb_udp_tunnel_segment(struct sk_buff *skb,

struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,

				       netdev_features_t features)

{

	struct sk_buff *segs = ERR_PTR(-EINVAL);
@@ -2371,53 +2350,3 @@ static struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb, 
out:

	return segs;

}
 


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;

}

net/ipv4/udp_offload.c

0 → 100644
+100 −0
Original line number Diff line number Diff line 
/*

 *	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);

}

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