Commit ad6f939a authored by Tom Herbert's avatar Tom Herbert Committed by David S. Miller
Browse files

ip: Add offset parameter to ip_cmsg_recv 



Add ip_cmsg_recv_offset function which takes an offset argument
that indicates the starting offset in skb where data is being received
from. This will be useful in the case of UDP and provided checksum
to user space.

ip_cmsg_recv is an inline call to ip_cmsg_recv_offset with offset of
zero.

Signed-off-by: default avatarTom Herbert <therbert@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5961de9f

include/net/inet_sock.h

+1 −0
Original line number Diff line number Diff line
@@ -203,6 +203,7 @@ struct inet_sock { 
#define IP_CMSG_RETOPTS		BIT(4)

#define IP_CMSG_PASSSEC		BIT(5)

#define IP_CMSG_ORIGDSTADDR	BIT(6)

#define IP_CMSG_CHECKSUM	BIT(7)



static inline struct inet_sock *inet_sk(const struct sock *sk)

{

include/uapi/linux/in.h

+1 −0
Original line number Diff line number Diff line
@@ -109,6 +109,7 @@ struct in_addr { 


#define IP_MINTTL       21

#define IP_NODEFRAG     22

#define IP_CHECKSUM	23



/* IP_MTU_DISCOVER values */

#define IP_PMTUDISC_DONT		0	/* Never send DF frames */

net/ipv4/ip_sockglue.c

+40 −1
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ 
#include <net/route.h>

#include <net/xfrm.h>

#include <net/compat.h>

#include <net/checksum.h>

#if IS_ENABLED(CONFIG_IPV6)

#include <net/transp_v6.h>

#endif
@@ -96,6 +97,20 @@ static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) 
	put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);

}



static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,

				  int offset)

{

	__wsum csum = skb->csum;



	if (skb->ip_summed != CHECKSUM_COMPLETE)

		return;



	if (offset != 0)

		csum = csum_sub(csum, csum_partial(skb->data, offset, 0));



	put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);

}



static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)

{

	char *secdata;
@@ -191,9 +206,16 @@ void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, 
			return;

	}



	if (flags & IP_CMSG_ORIGDSTADDR)

	if (flags & IP_CMSG_ORIGDSTADDR) {

		ip_cmsg_recv_dstaddr(msg, skb);



		flags &= ~IP_CMSG_ORIGDSTADDR;

		if (!flags)

			return;

	}



	if (flags & IP_CMSG_CHECKSUM)

		ip_cmsg_recv_checksum(msg, skb, offset);

}

EXPORT_SYMBOL(ip_cmsg_recv_offset);
@@ -533,6 +555,7 @@ static int do_ip_setsockopt(struct sock *sk, int level, 
	case IP_MULTICAST_ALL:

	case IP_MULTICAST_LOOP:

	case IP_RECVORIGDSTADDR:

	case IP_CHECKSUM:

		if (optlen >= sizeof(int)) {

			if (get_user(val, (int __user *) optval))

				return -EFAULT;
@@ -630,6 +653,19 @@ static int do_ip_setsockopt(struct sock *sk, int level, 
		else

			inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;

		break;

	case IP_CHECKSUM:

		if (val) {

			if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {

				inet_inc_convert_csum(sk);

				inet->cmsg_flags |= IP_CMSG_CHECKSUM;

			}

		} else {

			if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {

				inet_dec_convert_csum(sk);

				inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;

			}

		}

		break;

	case IP_TOS:	/* This sets both TOS and Precedence */

		if (sk->sk_type == SOCK_STREAM) {

			val &= ~INET_ECN_MASK;
@@ -1233,6 +1269,9 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname, 
	case IP_RECVORIGDSTADDR:

		val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;

		break;

	case IP_CHECKSUM:

		val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;

		break;

	case IP_TOS:

		val = inet->tos;

		break;

net/ipv4/udp.c

+1 −1
Original line number Diff line number Diff line
@@ -1329,7 +1329,7 @@ try_again: 
		*addr_len = sizeof(*sin);

	}

	if (inet->cmsg_flags)

		ip_cmsg_recv(msg, skb);

		ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr));



	err = copied;

	if (flags & MSG_TRUNC)

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