#ifndef lint
static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-dccp.c,v 1.5 2005-12-05 21:36:24 guy Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/tcpdump/print-dccp.c,v 1.8 2007-11-09 00:44:09 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
"check data checksum",
};
+static inline u_int dccp_csum_coverage(const struct dccp_hdr* dh, u_int len)
+{
+ u_int cov;
+
+ if (DCCPH_CSCOV(dh) == 0)
+ return len;
+ cov = (dh->dccph_doff + DCCPH_CSCOV(dh) - 1) * sizeof(u_int32_t);
+ return (cov > len)? len : cov;
+}
+
static int dccp_cksum(const struct ip *ip,
const struct dccp_hdr *dh, u_int len)
{
- union phu {
- struct phdr {
- u_int32_t src;
- u_int32_t dst;
- u_char mbz;
- u_char proto;
- u_int16_t len;
- } ph;
- u_int16_t pa[6];
- } phu;
- const u_int16_t *sp;
-
- /* pseudo-header.. */
- phu.ph.mbz = 0;
- phu.ph.len = htons(len);
- phu.ph.proto = IPPROTO_DCCP;
- memcpy(&phu.ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t));
- if (IP_HL(ip) == 5)
- memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t));
- else
- phu.ph.dst = ip_finddst(ip);
-
- sp = &phu.pa[0];
- return in_cksum((u_short *)dh, len, sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5]);
+ return nextproto4_cksum(ip, (const u_int8_t *)(void *)dh,
+ dccp_csum_coverage(dh, len), IPPROTO_DCCP);
}
#ifdef INET6
static int dccp6_cksum(const struct ip6_hdr *ip6, const struct dccp_hdr *dh, u_int len)
{
- size_t i;
- const u_int16_t *sp;
- u_int32_t sum;
- union {
- struct {
- struct in6_addr ph_src;
- struct in6_addr ph_dst;
- u_int32_t ph_len;
- u_int8_t ph_zero[3];
- u_int8_t ph_nxt;
- } ph;
- u_int16_t pa[20];
- } phu;
-
- /* pseudo-header */
- memset(&phu, 0, sizeof(phu));
- phu.ph.ph_src = ip6->ip6_src;
- phu.ph.ph_dst = ip6->ip6_dst;
- phu.ph.ph_len = htonl(len);
- phu.ph.ph_nxt = IPPROTO_DCCP;
-
- sum = 0;
- for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++)
- sum += phu.pa[i];
-
- sp = (const u_int16_t *)dh;
-
- for (i = 0; i < (len & ~1); i += 2)
- sum += *sp++;
-
- if (len & 1)
- sum += htons((*(const u_int8_t *)sp) << 8);
-
- while (sum > 0xffff)
- sum = (sum & 0xffff) + (sum >> 16);
- sum = ~sum & 0xffff;
-
- return (sum);
+ return nextproto6_cksum(ip6, (const u_int8_t *)(void *)dh,
+ dccp_csum_coverage(dh, len), IPPROTO_DCCP);
}
#endif
}
/* checksum calculation */
-#ifdef INET6
- if (ip6) {
- if (ip6->ip6_plen && vflag) {
- u_int16_t sum, dccp_sum;
+ if (vflag && TTEST2(bp[0], len)) {
+ u_int16_t sum = 0, dccp_sum;
+ dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
+ (void)printf("cksum 0x%04x ", dccp_sum);
+ if (IP_V(ip) == 4)
+ sum = dccp_cksum(ip, dh, len);
+#ifdef INET6
+ else if (IP_V(ip) == 6)
sum = dccp6_cksum(ip6, dh, len);
- dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
- printf("cksum 0x%04x", dccp_sum);
- if (sum != 0) {
- (void)printf(" (incorrect (-> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum));
- } else
- (void)printf(" (correct), ");
- }
- } else
-#endif /* INET6 */
- if (vflag)
- {
- u_int16_t sum, dccp_sum;
-
- sum = dccp_cksum(ip, dh, len);
- dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
- printf("cksum 0x%04x", dccp_sum);
- if (sum != 0) {
- (void)printf(" (incorrect (-> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum));
- } else
- (void)printf(" (correct), ");
+#endif
+ if (sum != 0)
+ (void)printf("(incorrect -> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum));
+ else
+ (void)printf("(correct), ");
}
switch (DCCPH_TYPE(dh)) {
struct dccp_hdr_request *dhr =
(struct dccp_hdr_request *)(bp + dccp_basic_hdr_len(dh));
TCHECK(*dhr);
- (void)printf("request (service=%d) ", dhr->dccph_req_service);
+ (void)printf("request (service=%d) ",
+ EXTRACT_32BITS(&dhr->dccph_req_service));
extlen += 4;
break;
}
struct dccp_hdr_response *dhr =
(struct dccp_hdr_response *)(bp + dccp_basic_hdr_len(dh));
TCHECK(*dhr);
- (void)printf("response (service=%d) ", dhr->dccph_resp_service);
+ (void)printf("response (service=%d) ",
+ EXTRACT_32BITS(&dhr->dccph_resp_service));
extlen += 12;
break;
}
static int dccp_print_option(const u_char *option)
{
u_int8_t optlen, i;
- u_int32_t *ts;
- u_int16_t *var16;
- u_int32_t *var32;
TCHECK(*option);
for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
break;
case 41:
- ts = (u_int32_t *)(option + 2);
- printf("timestamp %u", (u_int32_t)ntohl(*ts));
+ printf("timestamp %u", EXTRACT_32BITS(option + 2));
break;
case 42:
- ts = (u_int32_t *)(option + 2);
- printf("timestamp_echo %u", (u_int32_t)ntohl(*ts));
+ printf("timestamp_echo %u", EXTRACT_32BITS(option + 2));
break;
case 43:
printf("elapsed_time ");
- if (optlen == 6){
- ts = (u_int32_t *)(option + 2);
- printf("%u", (u_int32_t)ntohl(*ts));
- } else {
- var16 = (u_int16_t *)(option + 2);
- printf("%u", ntohs(*var16));
- }
+ if (optlen == 6)
+ printf("%u", EXTRACT_32BITS(option + 2));
+ else
+ printf("%u", EXTRACT_16BITS(option + 2));
break;
case 44:
printf("data_checksum ");
printf("CCID option %d",*option);
switch (optlen) {
case 4:
- var16 = (u_int16_t *)(option + 2);
- printf(" %u",ntohs(*var16));
+ printf(" %u", EXTRACT_16BITS(option + 2));
break;
case 6:
- var32 = (u_int32_t *)(option + 2);
- printf(" %u",(u_int32_t)ntohl(*var32));
+ printf(" %u", EXTRACT_32BITS(option + 2));
break;
default:
break;
projects / tcpdump / blobdiff