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skb_partial_csum_set(9) [centos man page]

SKB_PARTIAL_CSUM_SET(9) 					 Linux Networking					   SKB_PARTIAL_CSUM_SET(9)

skb_partial_csum_set - set up and verify partial csum values for packet SYNOPSIS
bool skb_partial_csum_set(struct sk_buff * skb, u16 start, u16 off); ARGUMENTS
skb the skb to set start the number of bytes after skb->data to start checksumming. off the offset from start to place the checksum. DESCRIPTION
For untrusted partially-checksummed packets, we need to make sure the values for skb->csum_start and skb->csum_offset are valid so we don't oops. This function checks and sets those values and skb->ip_summed: if this returns false you should drop the packet. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SKB_PARTIAL_CSUM_SET(9)

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__SKB_RECV_DATAGRAM(9)						 Linux Networking					    __SKB_RECV_DATAGRAM(9)

__skb_recv_datagram - Receive a datagram skbuff SYNOPSIS
struct sk_buff * __skb_recv_datagram(struct sock * sk, unsigned int flags, int * peeked, int * off, int * err); ARGUMENTS
sk socket flags MSG_ flags peeked returns non-zero if this packet has been seen before off an offset in bytes to peek skb from. Returns an offset within an skb where data actually starts err error code returned DESCRIPTION
Get a datagram skbuff, understands the peeking, nonblocking wakeups and possible races. This replaces identical code in packet, raw and udp, as well as the IPX AX.25 and Appletalk. It also finally fixes the long standing peek and read race for datagram sockets. If you alter this routine remember it must be re-entrant. This function will lock the socket if a skb is returned, so the caller needs to unlock the socket in that case (usually by calling skb_free_datagram) * It does not lock socket since today. This function is * free of race conditions. This measure should/can improve * significantly datagram socket latencies at high loads, * when data copying to user space takes lots of time. * (BTW I've just killed the last cli in IP/IPv6/core/netlink/packet * 8) Great win.) * --ANK (980729) The order of the tests when we find no data waiting are specified quite explicitly by POSIX 1003.1g, don't change them without having the standard around please. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 __SKB_RECV_DATAGRAM(9)
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