1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * Definitions for the UDP-Lite (RFC 3828 3 * Definitions for the UDP-Lite (RFC 3828) code.
4 */ 4 */
5 #ifndef _UDPLITE_H 5 #ifndef _UDPLITE_H
6 #define _UDPLITE_H 6 #define _UDPLITE_H
7 7
8 #include <net/ip6_checksum.h> 8 #include <net/ip6_checksum.h>
9 #include <net/udp.h> <<
10 9
11 /* UDP-Lite socket options */ 10 /* UDP-Lite socket options */
12 #define UDPLITE_SEND_CSCOV 10 /* sender part 11 #define UDPLITE_SEND_CSCOV 10 /* sender partial coverage (as sent) */
13 #define UDPLITE_RECV_CSCOV 11 /* receiver pa 12 #define UDPLITE_RECV_CSCOV 11 /* receiver partial coverage (threshold ) */
14 13
15 extern struct proto udplite_prot; 14 extern struct proto udplite_prot;
16 extern struct udp_table udplite_table; 15 extern struct udp_table udplite_table;
17 16
18 /* 17 /*
19 * Checksum computation is all in softwar 18 * Checksum computation is all in software, hence simpler getfrag.
20 */ 19 */
21 static __inline__ int udplite_getfrag(void *fr 20 static __inline__ int udplite_getfrag(void *from, char *to, int offset,
22 int len, 21 int len, int odd, struct sk_buff *skb)
23 { 22 {
24 struct msghdr *msg = from; 23 struct msghdr *msg = from;
25 return copy_from_iter_full(to, len, &m 24 return copy_from_iter_full(to, len, &msg->msg_iter) ? 0 : -EFAULT;
26 } 25 }
27 26
>> 27 /* Designate sk as UDP-Lite socket */
>> 28 static inline int udplite_sk_init(struct sock *sk)
>> 29 {
>> 30 udp_init_sock(sk);
>> 31 udp_sk(sk)->pcflag = UDPLITE_BIT;
>> 32 return 0;
>> 33 }
>> 34
28 /* 35 /*
29 * Checksumming routines 36 * Checksumming routines
30 */ 37 */
31 static inline int udplite_checksum_init(struct 38 static inline int udplite_checksum_init(struct sk_buff *skb, struct udphdr *uh)
32 { 39 {
33 u16 cscov; 40 u16 cscov;
34 41
35 /* In UDPv4 a zero checksum means that 42 /* In UDPv4 a zero checksum means that the transmitter generated no
36 * checksum. UDP-Lite (like IPv6) mand 43 * checksum. UDP-Lite (like IPv6) mandates checksums, hence packets
37 * with a zero checksum field are ille 44 * with a zero checksum field are illegal. */
38 if (uh->check == 0) { 45 if (uh->check == 0) {
39 net_dbg_ratelimited("UDPLite: 46 net_dbg_ratelimited("UDPLite: zeroed checksum field\n");
40 return 1; 47 return 1;
41 } 48 }
42 49
43 cscov = ntohs(uh->len); 50 cscov = ntohs(uh->len);
44 51
45 if (cscov == 0) /* Indicates 52 if (cscov == 0) /* Indicates that full coverage is required. */
46 ; 53 ;
47 else if (cscov < 8 || cscov > skb->le 54 else if (cscov < 8 || cscov > skb->len) {
48 /* 55 /*
49 * Coverage length violates RF 56 * Coverage length violates RFC 3828: log and discard silently.
50 */ 57 */
51 net_dbg_ratelimited("UDPLite: 58 net_dbg_ratelimited("UDPLite: bad csum coverage %d/%d\n",
52 cscov, skb 59 cscov, skb->len);
53 return 1; 60 return 1;
54 61
55 } else if (cscov < skb->len) { 62 } else if (cscov < skb->len) {
56 UDP_SKB_CB(skb)->partial_cov = 63 UDP_SKB_CB(skb)->partial_cov = 1;
57 UDP_SKB_CB(skb)->cscov = cscov 64 UDP_SKB_CB(skb)->cscov = cscov;
58 if (skb->ip_summed == CHECKSUM 65 if (skb->ip_summed == CHECKSUM_COMPLETE)
59 skb->ip_summed = CHECK 66 skb->ip_summed = CHECKSUM_NONE;
60 skb->csum_valid = 0; 67 skb->csum_valid = 0;
61 } 68 }
62 69
63 return 0; 70 return 0;
64 } 71 }
65 72
66 /* Fast-path computation of checksum. Socket m 73 /* Fast-path computation of checksum. Socket may not be locked. */
67 static inline __wsum udplite_csum(struct sk_bu 74 static inline __wsum udplite_csum(struct sk_buff *skb)
68 { 75 {
>> 76 const struct udp_sock *up = udp_sk(skb->sk);
69 const int off = skb_transport_offset(s 77 const int off = skb_transport_offset(skb);
70 const struct sock *sk = skb->sk; <<
71 int len = skb->len - off; 78 int len = skb->len - off;
72 79
73 if (udp_test_bit(UDPLITE_SEND_CC, sk)) !! 80 if ((up->pcflag & UDPLITE_SEND_CC) && up->pcslen < len) {
74 u16 pcslen = READ_ONCE(udp_sk( !! 81 if (0 < up->pcslen)
75 !! 82 len = up->pcslen;
76 if (pcslen < len) { !! 83 udp_hdr(skb)->len = htons(up->pcslen);
77 if (pcslen > 0) <<
78 len = pcslen; <<
79 udp_hdr(skb)->len = ht <<
80 } <<
81 } 84 }
82 skb->ip_summed = CHECKSUM_NONE; /* 85 skb->ip_summed = CHECKSUM_NONE; /* no HW support for checksumming */
83 86
84 return skb_checksum(skb, off, len, 0); 87 return skb_checksum(skb, off, len, 0);
85 } 88 }
86 89
87 void udplite4_register(void); 90 void udplite4_register(void);
>> 91 int udplite_get_port(struct sock *sk, unsigned short snum,
>> 92 int (*scmp)(const struct sock *, const struct sock *));
88 #endif /* _UDPLITE_H */ 93 #endif /* _UDPLITE_H */
89 94
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.