diff options
Diffstat (limited to 'src/l2_packet/l2_packet_linux.c')
| -rw-r--r-- | src/l2_packet/l2_packet_linux.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/l2_packet/l2_packet_linux.c b/src/l2_packet/l2_packet_linux.c index a7a300e568e6d..291c9dd263a6e 100644 --- a/src/l2_packet/l2_packet_linux.c +++ b/src/l2_packet/l2_packet_linux.c @@ -84,6 +84,26 @@ static const struct sock_fprog ndisc_sock_filter = { .filter = ndisc_sock_filter_insns, }; +/* drop packet if skb->pkt_type is PACKET_OTHERHOST (0x03). Generated by: + * $ bpfc - <<EOF + * > ldb #type + * > jeq #0x03, drop + * > pass: ret #-1 + * > drop: ret #0 + * > EOF + */ +static struct sock_filter pkt_type_filter_insns[] = { + { 0x30, 0, 0, 0xfffff004 }, + { 0x15, 1, 0, 0x00000003 }, + { 0x6, 0, 0, 0xffffffff }, + { 0x6, 0, 0, 0x00000000 }, +}; + +static const struct sock_fprog pkt_type_sock_filter = { + .len = ARRAY_SIZE(pkt_type_filter_insns), + .filter = pkt_type_filter_insns, +}; + int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr) { @@ -96,6 +116,9 @@ int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto, const u8 *buf, size_t len) { int ret; + + if (TEST_FAIL()) + return -1; if (l2 == NULL) return -1; if (l2->l2_hdr) { @@ -458,6 +481,9 @@ int l2_packet_set_packet_filter(struct l2_packet_data *l2, { const struct sock_fprog *sock_filter; + if (TEST_FAIL()) + return -1; + switch (type) { case L2_PACKET_FILTER_DHCP: sock_filter = &dhcp_sock_filter; @@ -465,6 +491,9 @@ int l2_packet_set_packet_filter(struct l2_packet_data *l2, case L2_PACKET_FILTER_NDISC: sock_filter = &ndisc_sock_filter; break; + case L2_PACKET_FILTER_PKTTYPE: + sock_filter = &pkt_type_sock_filter; + break; default: return -1; } |