diff options
Diffstat (limited to 'libdde-linux26/libdde_linux26/contrib/include/net/udplite.h')
-rw-r--r-- | libdde-linux26/libdde_linux26/contrib/include/net/udplite.h | 121 |
1 files changed, 0 insertions, 121 deletions
diff --git a/libdde-linux26/libdde_linux26/contrib/include/net/udplite.h b/libdde-linux26/libdde_linux26/contrib/include/net/udplite.h deleted file mode 100644 index afdffe60..00000000 --- a/libdde-linux26/libdde_linux26/contrib/include/net/udplite.h +++ /dev/null @@ -1,121 +0,0 @@ -/* - * 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) -{ - return memcpy_fromiovecend(to, (struct iovec *) from, offset, len); -} - -/* Designate sk as UDP-Lite socket */ -static inline int udplite_sk_init(struct sock *sk) -{ - udp_sk(sk)->pcflag = UDPLITE_BIT; - return 0; -} - -/* - * 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) { - LIMIT_NETDEBUG(KERN_DEBUG "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. - */ - LIMIT_NETDEBUG(KERN_DEBUG "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; -} - -static inline int udplite_sender_cscov(struct udp_sock *up, struct udphdr *uh) -{ - int cscov = up->len; - - /* - * Sender has set `partial coverage' option on UDP-Lite socket - */ - if (up->pcflag & UDPLITE_SEND_CC) { - if (up->pcslen < up->len) { - /* up->pcslen == 0 means that full coverage is required, - * partial coverage only if 0 < up->pcslen < up->len */ - if (0 < up->pcslen) { - cscov = up->pcslen; - } - uh->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. - */ - } - return cscov; -} - -static inline __wsum udplite_csum_outgoing(struct sock *sk, struct sk_buff *skb) -{ - int cscov = udplite_sender_cscov(udp_sk(sk), udp_hdr(skb)); - __wsum csum = 0; - - 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; -} - -extern void udplite4_register(void); -extern int udplite_get_port(struct sock *sk, unsigned short snum, - int (*scmp)(const struct sock *, const struct sock *)); -#endif /* _UDPLITE_H */ |