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Diffstat (limited to 'pcap_io.h')
-rw-r--r--pcap_io.h192
1 files changed, 155 insertions, 37 deletions
diff --git a/pcap_io.h b/pcap_io.h
index 497e453..5056e58 100644
--- a/pcap_io.h
+++ b/pcap_io.h
@@ -27,6 +27,8 @@
#define TCPDUMP_MAGIC 0xa1b2c3d4
#define ORIGINAL_TCPDUMP_MAGIC TCPDUMP_MAGIC
#define NSEC_TCPDUMP_MAGIC 0xa1b23c4d
+#define ORIGINAL_TCPDUMP_MAGIC_LL 0xb1b2c3d4 /* Internal dummy just for mapping */
+#define NSEC_TCPDUMP_MAGIC_LL 0xb1b23c4d /* Internal dummy just for mapping */
#define KUZNETZOV_TCPDUMP_MAGIC 0xa1b2cd34
#define BORKMANN_TCPDUMP_MAGIC 0xa1e2cb12
@@ -78,6 +80,20 @@ struct pcap_pkthdr_ns {
uint32_t len;
};
+struct pcap_pkthdr_ll {
+ struct pcap_timeval ts;
+ uint32_t caplen;
+ uint32_t len;
+ struct pcap_ll ll;
+};
+
+struct pcap_pkthdr_ns_ll {
+ struct pcap_timeval_ns ts;
+ uint32_t caplen;
+ uint32_t len;
+ struct pcap_ll ll;
+};
+
struct pcap_pkthdr_kuz {
struct pcap_timeval ts;
uint32_t caplen;
@@ -99,21 +115,27 @@ struct pcap_pkthdr_bkm {
};
typedef union {
- struct pcap_pkthdr ppo;
- struct pcap_pkthdr_ns ppn;
- struct pcap_pkthdr_kuz ppk;
- struct pcap_pkthdr_bkm ppb;
- uint8_t raw;
+ struct pcap_pkthdr ppo;
+ struct pcap_pkthdr_ns ppn;
+ struct pcap_pkthdr_ll ppo_ll;
+ struct pcap_pkthdr_ns_ll ppn_ll;
+ struct pcap_pkthdr_kuz ppk;
+ struct pcap_pkthdr_bkm ppb;
+ uint8_t raw;
} pcap_pkthdr_t;
enum pcap_type {
DEFAULT = ORIGINAL_TCPDUMP_MAGIC,
NSEC = NSEC_TCPDUMP_MAGIC,
+ DEFAULT_LL = ORIGINAL_TCPDUMP_MAGIC_LL,
+ NSEC_LL = NSEC_TCPDUMP_MAGIC_LL,
KUZNETZOV = KUZNETZOV_TCPDUMP_MAGIC,
BORKMANN = BORKMANN_TCPDUMP_MAGIC,
DEFAULT_SWAPPED = ___constant_swab32(ORIGINAL_TCPDUMP_MAGIC),
NSEC_SWAPPED = ___constant_swab32(NSEC_TCPDUMP_MAGIC),
+ DEFAULT_LL_SWAPPED = ___constant_swab32(ORIGINAL_TCPDUMP_MAGIC_LL),
+ NSEC_LL_SWAPPED = ___constant_swab32(NSEC_TCPDUMP_MAGIC_LL),
KUZNETZOV_SWAPPED = ___constant_swab32(KUZNETZOV_TCPDUMP_MAGIC),
BORKMANN_SWAPPED = ___constant_swab32(BORKMANN_TCPDUMP_MAGIC),
};
@@ -244,6 +266,19 @@ static inline int pcap_devtype_to_linktype(int dev_type)
}
}
+static inline bool link_has_sll_hdr(uint32_t link_type)
+{
+ switch (link_type) {
+ case LINKTYPE_NETLINK:
+ case LINKTYPE_LINUX_SLL:
+ case ___constant_swab32(LINKTYPE_NETLINK):
+ case ___constant_swab32(LINKTYPE_LINUX_SLL):
+ return true;
+ default:
+ return false;
+ }
+}
+
static inline int pcap_dev_to_linktype(const char *ifname)
{
return pcap_devtype_to_linktype(device_type(ifname));
@@ -287,20 +322,24 @@ static inline bool pcap_magic_is_swapped(uint32_t magic)
static inline u32 pcap_get_length(pcap_pkthdr_t *phdr, enum pcap_type type)
{
switch (type) {
-#define CASE_RET_CAPLEN(what, member, swap) \
+#define CASE_RET_CAPLEN(what, member, swap, extra) \
case (what): \
return (swap ? ___constant_swab32(phdr->member.caplen) : \
- phdr->member.caplen)
-
- CASE_RET_CAPLEN(DEFAULT, ppo, 0);
- CASE_RET_CAPLEN(NSEC, ppn, 0);
- CASE_RET_CAPLEN(KUZNETZOV, ppk, 0);
- CASE_RET_CAPLEN(BORKMANN, ppb, 0);
-
- CASE_RET_CAPLEN(DEFAULT_SWAPPED, ppo, 1);
- CASE_RET_CAPLEN(NSEC_SWAPPED, ppn, 1);
- CASE_RET_CAPLEN(KUZNETZOV_SWAPPED, ppk, 1);
- CASE_RET_CAPLEN(BORKMANN_SWAPPED, ppb, 1);
+ phdr->member.caplen) - extra
+
+ CASE_RET_CAPLEN(DEFAULT, ppo, 0, 0);
+ CASE_RET_CAPLEN(NSEC, ppn, 0, 0);
+ CASE_RET_CAPLEN(DEFAULT_LL, ppo_ll, 0, sizeof(struct pcap_ll));
+ CASE_RET_CAPLEN(NSEC_LL, ppn_ll, 0, sizeof(struct pcap_ll));
+ CASE_RET_CAPLEN(KUZNETZOV, ppk, 0, 0);
+ CASE_RET_CAPLEN(BORKMANN, ppb, 0, 0);
+
+ CASE_RET_CAPLEN(DEFAULT_SWAPPED, ppo, 1, 0);
+ CASE_RET_CAPLEN(NSEC_SWAPPED, ppn, 1, 0);
+ CASE_RET_CAPLEN(DEFAULT_LL_SWAPPED, ppo_ll, 1, sizeof(struct pcap_ll));
+ CASE_RET_CAPLEN(NSEC_LL_SWAPPED, ppn_ll, 1, sizeof(struct pcap_ll));
+ CASE_RET_CAPLEN(KUZNETZOV_SWAPPED, ppk, 1, 0);
+ CASE_RET_CAPLEN(BORKMANN_SWAPPED, ppb, 1, 0);
default:
bug();
@@ -317,11 +356,15 @@ static inline void pcap_set_length(pcap_pkthdr_t *phdr, enum pcap_type type, u32
CASE_SET_CAPLEN(DEFAULT, ppo, 0);
CASE_SET_CAPLEN(NSEC, ppn, 0);
+ CASE_SET_CAPLEN(DEFAULT_LL, ppo_ll, 0);
+ CASE_SET_CAPLEN(NSEC_LL, ppn_ll, 0);
CASE_SET_CAPLEN(KUZNETZOV, ppk, 0);
CASE_SET_CAPLEN(BORKMANN, ppb, 0);
CASE_SET_CAPLEN(DEFAULT_SWAPPED, ppo, 1);
CASE_SET_CAPLEN(NSEC_SWAPPED, ppn, 1);
+ CASE_SET_CAPLEN(DEFAULT_LL_SWAPPED, ppo_ll, 1);
+ CASE_SET_CAPLEN(NSEC_LL_SWAPPED, ppn_ll, 1);
CASE_SET_CAPLEN(KUZNETZOV_SWAPPED, ppk, 1);
CASE_SET_CAPLEN(BORKMANN_SWAPPED, ppb, 1);
@@ -339,11 +382,15 @@ static inline u32 pcap_get_hdr_length(pcap_pkthdr_t *phdr, enum pcap_type type)
CASE_RET_HDRLEN(DEFAULT, ppo);
CASE_RET_HDRLEN(NSEC, ppn);
+ CASE_RET_HDRLEN(DEFAULT_LL, ppo_ll);
+ CASE_RET_HDRLEN(NSEC_LL, ppn_ll);
CASE_RET_HDRLEN(KUZNETZOV, ppk);
CASE_RET_HDRLEN(BORKMANN, ppb);
CASE_RET_HDRLEN(DEFAULT_SWAPPED, ppo);
CASE_RET_HDRLEN(NSEC_SWAPPED, ppn);
+ CASE_RET_HDRLEN(DEFAULT_LL_SWAPPED, ppo_ll);
+ CASE_RET_HDRLEN(NSEC_LL_SWAPPED, ppn_ll);
CASE_RET_HDRLEN(KUZNETZOV_SWAPPED, ppk);
CASE_RET_HDRLEN(BORKMANN_SWAPPED, ppb);
@@ -354,25 +401,7 @@ static inline u32 pcap_get_hdr_length(pcap_pkthdr_t *phdr, enum pcap_type type)
static inline u32 pcap_get_total_length(pcap_pkthdr_t *phdr, enum pcap_type type)
{
- switch (type) {
-#define CASE_RET_TOTLEN(what, member, swap) \
- case (what): \
- return ((swap ? ___constant_swab32(phdr->member.caplen) : \
- phdr->member.caplen) + sizeof(phdr->member))
-
- CASE_RET_TOTLEN(DEFAULT, ppo, 0);
- CASE_RET_TOTLEN(NSEC, ppn, 0);
- CASE_RET_TOTLEN(KUZNETZOV, ppk, 0);
- CASE_RET_TOTLEN(BORKMANN, ppb, 0);
-
- CASE_RET_TOTLEN(DEFAULT_SWAPPED, ppo, 1);
- CASE_RET_TOTLEN(NSEC_SWAPPED, ppn, 1);
- CASE_RET_TOTLEN(KUZNETZOV_SWAPPED, ppk, 1);
- CASE_RET_TOTLEN(BORKMANN_SWAPPED, ppb, 1);
-
- default:
- bug();
- }
+ return pcap_get_hdr_length(phdr, type) + pcap_get_length(phdr, type);
}
static inline void
@@ -383,31 +412,55 @@ __tpacket_hdr_to_pcap_pkthdr(uint32_t sec, uint32_t nsec, uint32_t snaplen,
{
switch (type) {
case DEFAULT:
+ case DEFAULT_LL:
phdr->ppo.ts.tv_sec = sec;
phdr->ppo.ts.tv_usec = nsec / 1000;
phdr->ppo.caplen = snaplen;
phdr->ppo.len = len;
+ if (type == DEFAULT_LL) {
+ phdr->ppo.caplen += sizeof(struct pcap_ll);
+ phdr->ppo.len += sizeof(struct pcap_ll);
+ sockaddr_to_ll(sll, &phdr->ppo_ll.ll);
+ }
break;
case DEFAULT_SWAPPED:
+ case DEFAULT_LL_SWAPPED:
phdr->ppo.ts.tv_sec = ___constant_swab32(sec);
phdr->ppo.ts.tv_usec = ___constant_swab32(nsec / 1000);
phdr->ppo.caplen = ___constant_swab32(snaplen);
phdr->ppo.len = ___constant_swab32(len);
+ if (type == DEFAULT_LL_SWAPPED) {
+ phdr->ppo.caplen = ___constant_swab32(snaplen + sizeof(struct pcap_ll));
+ phdr->ppo.len = ___constant_swab32(len + sizeof(struct pcap_ll));
+ sockaddr_to_ll(sll, &phdr->ppo_ll.ll);
+ }
break;
case NSEC:
+ case NSEC_LL:
phdr->ppn.ts.tv_sec = sec;
phdr->ppn.ts.tv_nsec = nsec;
phdr->ppn.caplen = snaplen;
phdr->ppn.len = len;
+ if (type == NSEC_LL) {
+ phdr->ppn.caplen += sizeof(struct pcap_ll);
+ phdr->ppn.len += sizeof(struct pcap_ll);
+ sockaddr_to_ll(sll, &phdr->ppn_ll.ll);
+ }
break;
case NSEC_SWAPPED:
+ case NSEC_LL_SWAPPED:
phdr->ppn.ts.tv_sec = ___constant_swab32(sec);
phdr->ppn.ts.tv_nsec = ___constant_swab32(nsec);
phdr->ppn.caplen = ___constant_swab32(snaplen);
phdr->ppn.len = ___constant_swab32(len);
+ if (type == NSEC_LL_SWAPPED) {
+ phdr->ppn.caplen = ___constant_swab32(snaplen + sizeof(struct pcap_ll));
+ phdr->ppn.len = ___constant_swab32(len + sizeof(struct pcap_ll));
+ sockaddr_to_ll(sll, &phdr->ppn_ll.ll);
+ }
break;
case KUZNETZOV:
@@ -492,31 +545,59 @@ static inline void pcap_pkthdr_to_tpacket_hdr(pcap_pkthdr_t *phdr,
{
switch (type) {
case DEFAULT:
+ case DEFAULT_LL:
thdr->tp_sec = phdr->ppo.ts.tv_sec;
thdr->tp_nsec = phdr->ppo.ts.tv_usec * 1000;
thdr->tp_snaplen = phdr->ppo.caplen;
thdr->tp_len = phdr->ppo.len;
+ if (type == DEFAULT_LL) {
+ thdr->tp_snaplen -= sizeof(struct pcap_ll);
+ thdr->tp_len -= sizeof(struct pcap_ll);
+ if (sll)
+ ll_to_sockaddr(&phdr->ppo_ll.ll, sll);
+ }
break;
case DEFAULT_SWAPPED:
+ case DEFAULT_LL_SWAPPED:
thdr->tp_sec = ___constant_swab32(phdr->ppo.ts.tv_sec);
thdr->tp_nsec = ___constant_swab32(phdr->ppo.ts.tv_usec) * 1000;
thdr->tp_snaplen = ___constant_swab32(phdr->ppo.caplen);
thdr->tp_len = ___constant_swab32(phdr->ppo.len);
+ if (type == DEFAULT_LL_SWAPPED) {
+ thdr->tp_snaplen -= sizeof(struct pcap_ll);
+ thdr->tp_len -= sizeof(struct pcap_ll);
+ if (sll)
+ ll_to_sockaddr(&phdr->ppo_ll.ll, sll);
+ }
break;
case NSEC:
+ case NSEC_LL:
thdr->tp_sec = phdr->ppn.ts.tv_sec;
thdr->tp_nsec = phdr->ppn.ts.tv_nsec;
thdr->tp_snaplen = phdr->ppn.caplen;
thdr->tp_len = phdr->ppn.len;
+ if (type == NSEC_LL) {
+ thdr->tp_snaplen -= sizeof(struct pcap_ll);
+ thdr->tp_len -= sizeof(struct pcap_ll);
+ if (sll)
+ ll_to_sockaddr(&phdr->ppn_ll.ll, sll);
+ }
break;
case NSEC_SWAPPED:
+ case NSEC_LL_SWAPPED:
thdr->tp_sec = ___constant_swab32(phdr->ppn.ts.tv_sec);
thdr->tp_nsec = ___constant_swab32(phdr->ppn.ts.tv_nsec);
thdr->tp_snaplen = ___constant_swab32(phdr->ppn.caplen);
thdr->tp_len = ___constant_swab32(phdr->ppn.len);
+ if (type == NSEC_LL_SWAPPED) {
+ thdr->tp_snaplen -= sizeof(struct pcap_ll);
+ thdr->tp_len -= sizeof(struct pcap_ll);
+ if (sll)
+ ll_to_sockaddr(&phdr->ppn_ll.ll, sll);
+ }
break;
case KUZNETZOV:
@@ -682,6 +763,24 @@ static inline void pcap_prepare_header(struct pcap_filehdr *hdr, uint32_t magic,
{
bool swapped = pcap_magic_is_swapped(magic);
+ /* As *_LL types are just internal, we need to remap pcap
+ * magics to actually valid types.
+ */
+ switch (magic) {
+ case ORIGINAL_TCPDUMP_MAGIC_LL:
+ magic = ORIGINAL_TCPDUMP_MAGIC;
+ break;
+ case NSEC_TCPDUMP_MAGIC_LL:
+ magic = NSEC_TCPDUMP_MAGIC;
+ break;
+ case ___constant_swab32(ORIGINAL_TCPDUMP_MAGIC_LL):
+ magic = ___constant_swab32(ORIGINAL_TCPDUMP_MAGIC);
+ break;
+ case ___constant_swab32(NSEC_TCPDUMP_MAGIC_LL):
+ magic = ___constant_swab32(NSEC_TCPDUMP_MAGIC);
+ break;
+ }
+
hdr->magic = magic;
hdr->version_major = swapped ? ___constant_swab16(PCAP_VERSION_MAJOR) : PCAP_VERSION_MAJOR;
hdr->version_minor = swapped ? ___constant_swab16(PCAP_VERSION_MINOR) : PCAP_VERSION_MINOR;
@@ -716,9 +815,10 @@ static const bool pcap_supported_linktypes[LINKTYPE_MAX] __maybe_unused = {
[LINKTYPE_IEEE802_15_4_LINUX] = true,
[LINKTYPE_INFINIBAND] = true,
[LINKTYPE_NETLINK] = true,
+ [LINKTYPE_LINUX_SLL] = true,
};
-static inline void pcap_validate_header(const struct pcap_filehdr *hdr)
+static inline void pcap_validate_header(struct pcap_filehdr *hdr)
{
bool good = false;
uint32_t linktype;
@@ -737,6 +837,24 @@ static inline void pcap_validate_header(const struct pcap_filehdr *hdr)
if (unlikely(hdr->version_minor != PCAP_VERSION_MINOR) &&
___constant_swab16(hdr->version_minor) != PCAP_VERSION_MINOR)
panic("This file has an invalid pcap minor version (must be %d)\n", PCAP_VERSION_MINOR);
+
+ /* Remap to internal *_LL types in case of LINKTYPE_LINUX_SLL. */
+ if (linktype == LINKTYPE_LINUX_SLL || linktype == LINKTYPE_NETLINK) {
+ switch (hdr->magic) {
+ case ORIGINAL_TCPDUMP_MAGIC:
+ hdr->magic = ORIGINAL_TCPDUMP_MAGIC_LL;
+ break;
+ case NSEC_TCPDUMP_MAGIC:
+ hdr->magic = NSEC_TCPDUMP_MAGIC_LL;
+ break;
+ case ___constant_swab32(ORIGINAL_TCPDUMP_MAGIC):
+ hdr->magic = ___constant_swab32(ORIGINAL_TCPDUMP_MAGIC_LL);
+ break;
+ case ___constant_swab32(NSEC_TCPDUMP_MAGIC):
+ hdr->magic = ___constant_swab32(NSEC_TCPDUMP_MAGIC_LL);
+ break;
+ }
+ }
}
static int pcap_generic_pull_fhdr(int fd, uint32_t *magic,
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-11-23 16:22:35 +0000