/* * netsniff-ng - the packet sniffing beast * Copyright 2012 Markus Amend , Deutsche Flugsicherung GmbH * Subject to the GPL, version 2. * * http://tools.ietf.org/html/rfc3032 */ #include #include #include /* for ntohs() */ #include #include "proto.h" #include "dissector_eth.h" #include "built_in.h" #include "pkt_buff.h" struct mpls_uchdr { uint32_t mpls_uc_hdr; } __packed; static int mpls_uc_next_proto(struct pkt_buff *pkt) { uint8_t proto; uint16_t key = 0; if (pkt_len(pkt)) proto = *(pkt->data); else return -EIO; /* FIXME: Right now only test for IP Version field */ switch (proto >> 4) { case 4: key = 0x0800; /* IPv4*/ break; case 6: key = 0x86DD; /* IPv6*/ break; default: /* Nothing detected ... */ return -ENOENT; } return key; } static void mpls_uc_full(struct pkt_buff *pkt) { int next; uint32_t mpls_uc_data; struct mpls_uchdr *mpls_uc; uint8_t s = 0; do { mpls_uc = (struct mpls_uchdr *) pkt_pull(pkt, sizeof(*mpls_uc)); if (mpls_uc == NULL) return; mpls_uc_data = ntohl(mpls_uc->mpls_uc_hdr); s = (mpls_uc_data >> 8) & 0x1; tprintf(" [ MPLS "); tprintf("Label (%u), ", mpls_uc_data >> 12); tprintf("Exp (%u), ", (mpls_uc_data >> 9) & 0x7); tprintf("S (%u), ", s); tprintf("TTL (%u)", (mpls_uc_data & 0xFF)); tprintf(" ]\n"); } while (!s); next = mpls_uc_next_proto(pkt); if (next < 0) return; pkt_set_dissector(pkt, ð_lay2, (uint16_t) next); } static void mpls_uc_less(struct pkt_buff *pkt) { int next; uint32_t mpls_uc_data; struct mpls_uchdr *mpls_uc; uint8_t s = 0; do { mpls_uc = (struct mpls_uchdr *) pkt_pull(pkt, sizeof(*mpls_uc)); if (mpls_uc == NULL) return; mpls_uc_data = ntohl(mpls_uc->mpls_uc_hdr); s = (mpls_uc_data >> 8) & 0x1; tprintf(" MPLS/%u", mpls_uc_data >> 12); } while (!s); next = mpls_uc_next_proto(pkt); if (next < 0) return; pkt_set_dissector(pkt, ð_lay2, (uint16_t) next); } struct protocol mpls_uc_ops = { .key = 0x8847, .print_full = mpls_uc_full, .print_less = mpls_uc_less, }; 4a9c00980552fe508c'>commitdiff
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authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /net/l3mdev/l3mdev.c
parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/l3mdev/l3mdev.c')