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Release 4.12 include/net/udplite.h

Directory: include/net
/*
 *      Definitions for the UDP-Lite (RFC 3828) code.
 */
#ifndef _UDPLITE_H

#define _UDPLITE_H

#include <net/ip6_checksum.h>

/* UDP-Lite socket options */

#define UDPLITE_SEND_CSCOV   10 
/* sender partial coverage (as sent)      */

#define UDPLITE_RECV_CSCOV   11 
/* receiver partial coverage (threshold ) */

extern struct proto 		udplite_prot;
extern struct udp_table		udplite_table;

/*
 *      Checksum computation is all in software, hence simpler getfrag.
 */

static __inline__ int udplite_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) { struct msghdr *msg = from; return copy_from_iter_full(to, len, &msg->msg_iter) ? 0 : -EFAULT; }

Contributors

PersonTokensPropCommitsCommitProp
Gerrit Renker3564.81%120.00%
Al Viro1935.19%480.00%
Total54100.00%5100.00%

/* Designate sk as UDP-Lite socket */
static inline int udplite_sk_init(struct sock *sk) { udp_sk(sk)->pcflag = UDPLITE_BIT; sk->sk_destruct = udp_destruct_sock; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Gerrit Renker2480.00%150.00%
Paolo Abeni620.00%150.00%
Total30100.00%2100.00%

/* * Checksumming routines */
static inline int udplite_checksum_init(struct sk_buff *skb, struct udphdr *uh) { u16 cscov; /* In UDPv4 a zero checksum means that the transmitter generated no * checksum. UDP-Lite (like IPv6) mandates checksums, hence packets * with a zero checksum field are illegal. */ if (uh->check == 0) { net_dbg_ratelimited("UDPLite: zeroed checksum field\n"); return 1; } cscov = ntohs(uh->len); if (cscov == 0) /* Indicates that full coverage is required. */ ; else if (cscov < 8 || cscov > skb->len) { /* * Coverage length violates RFC 3828: log and discard silently. */ net_dbg_ratelimited("UDPLite: bad csum coverage %d/%d\n", cscov, skb->len); return 1; } else if (cscov < skb->len) { UDP_SKB_CB(skb)->partial_cov = 1; UDP_SKB_CB(skb)->cscov = cscov; if (skb->ip_summed == CHECKSUM_COMPLETE) skb->ip_summed = CHECKSUM_NONE; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Gerrit Renker11990.15%125.00%
Herbert Xu96.82%125.00%
Joe Perches43.03%250.00%
Total132100.00%4100.00%

/* Slow-path computation of checksum. Socket is locked. */
static inline __wsum udplite_csum_outgoing(struct sock *sk, struct sk_buff *skb) { const struct udp_sock *up = udp_sk(skb->sk); int cscov = up->len; __wsum csum = 0; if (up->pcflag & UDPLITE_SEND_CC) { /* * Sender has set `partial coverage' option on UDP-Lite socket. * The special case "up->pcslen == 0" signifies full coverage. */ if (up->pcslen < up->len) { if (0 < up->pcslen) cscov = up->pcslen; udp_hdr(skb)->len = htons(up->pcslen); } /* * NOTE: Causes for the error case `up->pcslen > up->len': * (i) Application error (will not be penalized). * (ii) Payload too big for send buffer: data is split * into several packets, each with its own header. * In this case (e.g. last segment), coverage may * exceed packet length. * Since packets with coverage length > packet length are * illegal, we fall back to the defaults here. */ } skb->ip_summed = CHECKSUM_NONE; /* no HW support for checksumming */ skb_queue_walk(&sk->sk_write_queue, skb) { const int off = skb_transport_offset(skb); const int len = skb->len - off; csum = skb_checksum(skb, off, (cscov > len)? len : cscov, csum); if ((cscov -= len) <= 0) break; } return csum; }

Contributors

PersonTokensPropCommitsCommitProp
Gerrit Renker15293.25%266.67%
Arnaldo Carvalho de Melo116.75%133.33%
Total163100.00%3100.00%

/* Fast-path computation of checksum. Socket may not be locked. */
static inline __wsum udplite_csum(struct sk_buff *skb) { const struct udp_sock *up = udp_sk(skb->sk); const int off = skb_transport_offset(skb); int len = skb->len - off; if ((up->pcflag & UDPLITE_SEND_CC) && up->pcslen < len) { if (0 < up->pcslen) len = up->pcslen; udp_hdr(skb)->len = htons(up->pcslen); } skb->ip_summed = CHECKSUM_NONE; /* no HW support for checksumming */ return skb_checksum(skb, off, len, 0); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu5752.78%150.00%
Gerrit Renker5147.22%150.00%
Total108100.00%2100.00%

void udplite4_register(void); int udplite_get_port(struct sock *sk, unsigned short snum, int (*scmp)(const struct sock *, const struct sock *)); #endif /* _UDPLITE_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Gerrit Renker43877.94%213.33%
Herbert Xu6611.74%213.33%
Al Viro193.38%426.67%
David S. Miller162.85%213.33%
Arnaldo Carvalho de Melo111.96%16.67%
Paolo Abeni61.07%16.67%
Joe Perches40.71%213.33%
Eric Dumazet20.36%16.67%
Total562100.00%15100.00%
Directory: include/net
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