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head/sys/netinet/netdump/netdump_client.c
Property | Old Value | New Value |
---|---|---|
svn:keywords | null | FreeBSD=%H \ No newline at end of property |
/*- | |||||
* Copyright (c) 2005-2014 Sandvine Incorporated. All rights reserved. | |||||
* Copyright (c) 2000 Darrell Anderson | |||||
* All rights reserved. | |||||
* | |||||
* Redistribution and use in source and binary forms, with or without | |||||
* modification, are permitted provided that the following conditions | |||||
* are met: | |||||
* 1. Redistributions of source code must retain the above copyright | |||||
* notice, this list of conditions and the following disclaimer. | |||||
* 2. Redistributions in binary form must reproduce the above copyright | |||||
* notice, this list of conditions and the following disclaimer in the | |||||
* documentation and/or other materials provided with the distribution. | |||||
* | |||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
* SUCH DAMAGE. | |||||
*/ | |||||
/* | |||||
* netdump_client.c | |||||
* FreeBSD subsystem supporting netdump network dumps. | |||||
* A dedicated server must be running to accept client dumps. | |||||
*/ | |||||
#include <sys/cdefs.h> | |||||
__FBSDID("$FreeBSD$"); | |||||
#include <sys/param.h> | |||||
#include <sys/conf.h> | |||||
#include <sys/disk.h> | |||||
#include <sys/endian.h> | |||||
#include <sys/kernel.h> | |||||
#include <sys/kerneldump.h> | |||||
#include <sys/mbuf.h> | |||||
#include <sys/module.h> | |||||
#include <sys/priv.h> | |||||
#include <sys/proc.h> | |||||
#include <sys/protosw.h> | |||||
#include <sys/socket.h> | |||||
#include <sys/sysctl.h> | |||||
#include <sys/systm.h> | |||||
#include <net/ethernet.h> | |||||
#include <net/if.h> | |||||
#include <net/if_arp.h> | |||||
#include <net/if_dl.h> | |||||
#include <net/if_types.h> | |||||
#include <net/if_var.h> | |||||
#include <netinet/in.h> | |||||
#include <netinet/in_systm.h> | |||||
#include <netinet/in_var.h> | |||||
#include <netinet/ip.h> | |||||
#include <netinet/ip_var.h> | |||||
#include <netinet/ip_options.h> | |||||
#include <netinet/udp.h> | |||||
#include <netinet/udp_var.h> | |||||
#include <netinet/netdump/netdump.h> | |||||
#include <machine/in_cksum.h> | |||||
#include <machine/pcb.h> | |||||
#define NETDDEBUG(f, ...) do { \ | |||||
if (nd_debug > 0) \ | |||||
printf(("%s: " f), __func__, ## __VA_ARGS__); \ | |||||
} while (0) | |||||
#define NETDDEBUG_IF(i, f, ...) do { \ | |||||
if (nd_debug > 0) \ | |||||
if_printf((i), ("%s: " f), __func__, ## __VA_ARGS__); \ | |||||
} while (0) | |||||
#define NETDDEBUGV(f, ...) do { \ | |||||
if (nd_debug > 1) \ | |||||
printf(("%s: " f), __func__, ## __VA_ARGS__); \ | |||||
} while (0) | |||||
#define NETDDEBUGV_IF(i, f, ...) do { \ | |||||
if (nd_debug > 1) \ | |||||
if_printf((i), ("%s: " f), __func__, ## __VA_ARGS__); \ | |||||
} while (0) | |||||
static int netdump_arp_gw(void); | |||||
static void netdump_cleanup(void); | |||||
static int netdump_configure(struct netdump_conf *); | |||||
static int netdump_dumper(void *priv __unused, void *virtual, | |||||
vm_offset_t physical __unused, off_t offset, size_t length); | |||||
static int netdump_ether_output(struct mbuf *m, struct ifnet *ifp, | |||||
struct ether_addr dst, u_short etype); | |||||
static void netdump_handle_arp(struct mbuf **mb); | |||||
static void netdump_handle_ip(struct mbuf **mb); | |||||
static int netdump_ioctl(struct cdev *dev __unused, u_long cmd, | |||||
caddr_t addr, int flags __unused, struct thread *td); | |||||
static int netdump_modevent(module_t mod, int type, void *priv); | |||||
static void netdump_network_poll(void); | |||||
static void netdump_pkt_in(struct ifnet *ifp, struct mbuf *m); | |||||
static int netdump_send(uint32_t type, off_t offset, unsigned char *data, | |||||
uint32_t datalen); | |||||
static int netdump_send_arp(in_addr_t dst); | |||||
static int netdump_start(struct dumperinfo *di); | |||||
static int netdump_udp_output(struct mbuf *m); | |||||
/* Must be at least as big as the chunks dumpsys() gives us. */ | |||||
static unsigned char nd_buf[MAXDUMPPGS * PAGE_SIZE]; | |||||
static uint32_t nd_seqno; | |||||
static int dump_failed, have_gw_mac; | |||||
static void (*drv_if_input)(struct ifnet *, struct mbuf *); | |||||
static int restore_gw_addr; | |||||
static uint64_t rcvd_acks; | |||||
CTASSERT(sizeof(rcvd_acks) * NBBY == NETDUMP_MAX_IN_FLIGHT); | |||||
/* | |||||
* Times to poll the NIC (0.5ms each poll) before assuming packetloss | |||||
* occurred (default to 1s). | |||||
*/ | |||||
static int nd_polls = 2000; | |||||
/* Times to retransmit lost packets. */ | |||||
static int nd_retries = 10; | |||||
/* Number of ARP retries. */ | |||||
static int nd_arp_retries = 3; | |||||
/* Configuration parameters. */ | |||||
static struct netdump_conf nd_conf; | |||||
#define nd_server nd_conf.ndc_server | |||||
#define nd_client nd_conf.ndc_client | |||||
#define nd_gateway nd_conf.ndc_gateway | |||||
/* General dynamic settings. */ | |||||
static struct ether_addr nd_gw_mac; | |||||
static struct ifnet *nd_ifp; | |||||
static uint16_t nd_server_port = NETDUMP_PORT; | |||||
FEATURE(netdump, "Netdump client support"); | |||||
static SYSCTL_NODE(_net, OID_AUTO, netdump, CTLFLAG_RD, NULL, | |||||
"netdump parameters"); | |||||
static int nd_debug; | |||||
SYSCTL_INT(_net_netdump, OID_AUTO, debug, CTLFLAG_RWTUN, | |||||
&nd_debug, 0, | |||||
"Debug message verbosity"); | |||||
static int nd_enabled; | |||||
SYSCTL_INT(_net_netdump, OID_AUTO, enabled, CTLFLAG_RD, | |||||
&nd_enabled, 0, | |||||
"netdump configuration status"); | |||||
static char nd_path[MAXPATHLEN]; | |||||
SYSCTL_STRING(_net_netdump, OID_AUTO, path, CTLFLAG_RW, | |||||
nd_path, sizeof(nd_path), | |||||
"Server path for output files"); | |||||
/* | |||||
* Checks for netdump support on a network interface | |||||
* | |||||
* Parameters: | |||||
* ifp The network interface that is being tested for support | |||||
* | |||||
* Returns: | |||||
* int 1 if the interface is supported, 0 if not | |||||
*/ | |||||
static bool | |||||
netdump_supported_nic(struct ifnet *ifp) | |||||
{ | |||||
return (ifp->if_netdump_methods != NULL); | |||||
} | |||||
/*- | |||||
* Network specific primitives. | |||||
* Following down the code they are divided ordered as: | |||||
* - Packet buffer primitives | |||||
* - Output primitives | |||||
* - Input primitives | |||||
* - Polling primitives | |||||
*/ | |||||
/* | |||||
* Handles creation of the ethernet header, then places outgoing packets into | |||||
* the tx buffer for the NIC | |||||
* | |||||
* Parameters: | |||||
* m The mbuf containing the packet to be sent (will be freed by | |||||
* this function or the NIC driver) | |||||
* ifp The interface to send on | |||||
* dst The destination ethernet address (source address will be looked | |||||
* up using ifp) | |||||
* etype The ETHERTYPE_* value for the protocol that is being sent | |||||
* | |||||
* Returns: | |||||
* int see errno.h, 0 for success | |||||
*/ | |||||
static int | |||||
netdump_ether_output(struct mbuf *m, struct ifnet *ifp, struct ether_addr dst, | |||||
u_short etype) | |||||
{ | |||||
struct ether_header *eh; | |||||
if (((ifp->if_flags & (IFF_MONITOR | IFF_UP)) != IFF_UP) || | |||||
(ifp->if_drv_flags & IFF_DRV_RUNNING) != IFF_DRV_RUNNING) { | |||||
if_printf(ifp, "netdump_ether_output: interface isn't up\n"); | |||||
m_freem(m); | |||||
return (ENETDOWN); | |||||
} | |||||
/* Fill in the ethernet header. */ | |||||
M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT); | |||||
if (m == NULL) { | |||||
printf("%s: out of mbufs\n", __func__); | |||||
return (ENOBUFS); | |||||
} | |||||
eh = mtod(m, struct ether_header *); | |||||
memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); | |||||
memcpy(eh->ether_dhost, dst.octet, ETHER_ADDR_LEN); | |||||
eh->ether_type = htons(etype); | |||||
return ((ifp->if_netdump_methods->nd_transmit)(ifp, m)); | |||||
} | |||||
/* | |||||
* Unreliable transmission of an mbuf chain to the netdump server | |||||
* Note: can't handle fragmentation; fails if the packet is larger than | |||||
* nd_ifp->if_mtu after adding the UDP/IP headers | |||||
* | |||||
* Parameters: | |||||
* m mbuf chain | |||||
* | |||||
* Returns: | |||||
* int see errno.h, 0 for success | |||||
*/ | |||||
static int | |||||
netdump_udp_output(struct mbuf *m) | |||||
{ | |||||
struct udpiphdr *ui; | |||||
struct ip *ip; | |||||
MPASS(nd_ifp != NULL); | |||||
M_PREPEND(m, sizeof(struct udpiphdr), M_NOWAIT); | |||||
if (m == NULL) { | |||||
printf("%s: out of mbufs\n", __func__); | |||||
return (ENOBUFS); | |||||
} | |||||
if (m->m_pkthdr.len > nd_ifp->if_mtu) { | |||||
printf("netdump_udp_output: Packet is too big: %d > MTU %u\n", | |||||
m->m_pkthdr.len, nd_ifp->if_mtu); | |||||
m_freem(m); | |||||
return (ENOBUFS); | |||||
} | |||||
ui = mtod(m, struct udpiphdr *); | |||||
bzero(ui->ui_x1, sizeof(ui->ui_x1)); | |||||
ui->ui_pr = IPPROTO_UDP; | |||||
ui->ui_len = htons(m->m_pkthdr.len - sizeof(struct ip)); | |||||
ui->ui_ulen = ui->ui_len; | |||||
ui->ui_src = nd_client; | |||||
ui->ui_dst = nd_server; | |||||
/* Use this src port so that the server can connect() the socket */ | |||||
ui->ui_sport = htons(NETDUMP_ACKPORT); | |||||
ui->ui_dport = htons(nd_server_port); | |||||
ui->ui_sum = 0; | |||||
if ((ui->ui_sum = in_cksum(m, m->m_pkthdr.len)) == 0) | |||||
ui->ui_sum = 0xffff; | |||||
ip = mtod(m, struct ip *); | |||||
ip->ip_v = IPVERSION; | |||||
ip->ip_hl = sizeof(struct ip) >> 2; | |||||
ip->ip_tos = 0; | |||||
ip->ip_len = htons(m->m_pkthdr.len); | |||||
ip->ip_id = 0; | |||||
ip->ip_off = htons(IP_DF); | |||||
ip->ip_ttl = 255; | |||||
ip->ip_sum = 0; | |||||
ip->ip_sum = in_cksum(m, sizeof(struct ip)); | |||||
return (netdump_ether_output(m, nd_ifp, nd_gw_mac, ETHERTYPE_IP)); | |||||
} | |||||
/* | |||||
* Builds and sends a single ARP request to locate the server | |||||
* | |||||
* Return value: | |||||
* 0 on success | |||||
* errno on error | |||||
*/ | |||||
static int | |||||
netdump_send_arp(in_addr_t dst) | |||||
{ | |||||
struct ether_addr bcast; | |||||
struct mbuf *m; | |||||
struct arphdr *ah; | |||||
int pktlen; | |||||
MPASS(nd_ifp != NULL); | |||||
/* Fill-up a broadcast address. */ | |||||
memset(&bcast, 0xFF, ETHER_ADDR_LEN); | |||||
m = m_gethdr(M_NOWAIT, MT_DATA); | |||||
if (m == NULL) { | |||||
printf("netdump_send_arp: Out of mbufs\n"); | |||||
return (ENOBUFS); | |||||
} | |||||
pktlen = arphdr_len2(ETHER_ADDR_LEN, sizeof(struct in_addr)); | |||||
m->m_len = pktlen; | |||||
m->m_pkthdr.len = pktlen; | |||||
MH_ALIGN(m, pktlen); | |||||
ah = mtod(m, struct arphdr *); | |||||
ah->ar_hrd = htons(ARPHRD_ETHER); | |||||
ah->ar_pro = htons(ETHERTYPE_IP); | |||||
ah->ar_hln = ETHER_ADDR_LEN; | |||||
ah->ar_pln = sizeof(struct in_addr); | |||||
ah->ar_op = htons(ARPOP_REQUEST); | |||||
memcpy(ar_sha(ah), IF_LLADDR(nd_ifp), ETHER_ADDR_LEN); | |||||
((struct in_addr *)ar_spa(ah))->s_addr = nd_client.s_addr; | |||||
bzero(ar_tha(ah), ETHER_ADDR_LEN); | |||||
((struct in_addr *)ar_tpa(ah))->s_addr = dst; | |||||
return (netdump_ether_output(m, nd_ifp, bcast, ETHERTYPE_ARP)); | |||||
} | |||||
/* | |||||
* Sends ARP requests to locate the server and waits for a response. | |||||
* We first try to ARP the server itself, and fall back to the provided | |||||
* gateway if the server appears to be off-link. | |||||
* | |||||
* Return value: | |||||
* 0 on success | |||||
* errno on error | |||||
*/ | |||||
static int | |||||
netdump_arp_gw(void) | |||||
{ | |||||
in_addr_t dst; | |||||
int error, polls, retries; | |||||
dst = nd_server.s_addr; | |||||
restart: | |||||
for (retries = 0; retries < nd_arp_retries && have_gw_mac == 0; | |||||
retries++) { | |||||
error = netdump_send_arp(dst); | |||||
if (error != 0) | |||||
return (error); | |||||
for (polls = 0; polls < nd_polls && have_gw_mac == 0; polls++) { | |||||
netdump_network_poll(); | |||||
DELAY(500); | |||||
} | |||||
if (have_gw_mac == 0) | |||||
printf("(ARP retry)"); | |||||
} | |||||
if (have_gw_mac != 0) | |||||
return (0); | |||||
if (dst == nd_server.s_addr && nd_server.s_addr != nd_gateway.s_addr) { | |||||
printf("Failed to ARP server, trying to reach gateway...\n"); | |||||
dst = nd_gateway.s_addr; | |||||
goto restart; | |||||
} | |||||
printf("\nARP timed out.\n"); | |||||
return (ETIMEDOUT); | |||||
} | |||||
/* | |||||
* Dummy free function for netdump clusters. | |||||
*/ | |||||
static void | |||||
netdump_mbuf_free(struct mbuf *m __unused) | |||||
{ | |||||
} | |||||
/* | |||||
* Construct and reliably send a netdump packet. May fail from a resource | |||||
* shortage or extreme number of unacknowledged retransmissions. Wait for | |||||
* an acknowledgement before returning. Splits packets into chunks small | |||||
* enough to be sent without fragmentation (looks up the interface MTU) | |||||
* | |||||
* Parameters: | |||||
* type netdump packet type (HERALD, FINISHED, or VMCORE) | |||||
* offset vmcore data offset (bytes) | |||||
* data vmcore data | |||||
* datalen vmcore data size (bytes) | |||||
* | |||||
* Returns: | |||||
* int see errno.h, 0 for success | |||||
*/ | |||||
static int | |||||
netdump_send(uint32_t type, off_t offset, unsigned char *data, uint32_t datalen) | |||||
{ | |||||
struct netdump_msg_hdr *nd_msg_hdr; | |||||
struct mbuf *m, *m2; | |||||
uint64_t want_acks; | |||||
uint32_t i, pktlen, sent_so_far; | |||||
int retries, polls, error; | |||||
want_acks = 0; | |||||
rcvd_acks = 0; | |||||
retries = 0; | |||||
MPASS(nd_ifp != NULL); | |||||
retransmit: | |||||
/* Chunks can be too big to fit in packets. */ | |||||
for (i = sent_so_far = 0; sent_so_far < datalen || | |||||
(i == 0 && datalen == 0); i++) { | |||||
pktlen = datalen - sent_so_far; | |||||
/* First bound: the packet structure. */ | |||||
pktlen = min(pktlen, NETDUMP_DATASIZE); | |||||
/* Second bound: the interface MTU (assume no IP options). */ | |||||
pktlen = min(pktlen, nd_ifp->if_mtu - sizeof(struct udpiphdr) - | |||||
sizeof(struct netdump_msg_hdr)); | |||||
/* | |||||
* Check if it is retransmitting and this has been ACKed | |||||
* already. | |||||
*/ | |||||
if ((rcvd_acks & (1 << i)) != 0) { | |||||
sent_so_far += pktlen; | |||||
continue; | |||||
} | |||||
/* | |||||
* Get and fill a header mbuf, then chain data as an extended | |||||
* mbuf. | |||||
*/ | |||||
m = m_gethdr(M_NOWAIT, MT_DATA); | |||||
if (m == NULL) { | |||||
printf("netdump_send: Out of mbufs\n"); | |||||
return (ENOBUFS); | |||||
} | |||||
m->m_len = sizeof(struct netdump_msg_hdr); | |||||
m->m_pkthdr.len = sizeof(struct netdump_msg_hdr); | |||||
MH_ALIGN(m, sizeof(struct netdump_msg_hdr)); | |||||
nd_msg_hdr = mtod(m, struct netdump_msg_hdr *); | |||||
nd_msg_hdr->mh_seqno = htonl(nd_seqno + i); | |||||
nd_msg_hdr->mh_type = htonl(type); | |||||
nd_msg_hdr->mh_offset = htobe64(offset + sent_so_far); | |||||
nd_msg_hdr->mh_len = htonl(pktlen); | |||||
nd_msg_hdr->mh__pad = 0; | |||||
if (pktlen != 0) { | |||||
m2 = m_get(M_NOWAIT, MT_DATA); | |||||
if (m2 == NULL) { | |||||
m_freem(m); | |||||
printf("netdump_send: Out of mbufs\n"); | |||||
return (ENOBUFS); | |||||
} | |||||
MEXTADD(m2, data + sent_so_far, pktlen, | |||||
netdump_mbuf_free, NULL, NULL, 0, EXT_DISPOSABLE); | |||||
m2->m_len = pktlen; | |||||
m_cat(m, m2); | |||||
m->m_pkthdr.len += pktlen; | |||||
} | |||||
error = netdump_udp_output(m); | |||||
if (error != 0) | |||||
return (error); | |||||
/* Note that we're waiting for this packet in the bitfield. */ | |||||
want_acks |= (1 << i); | |||||
sent_so_far += pktlen; | |||||
} | |||||
if (i >= NETDUMP_MAX_IN_FLIGHT) | |||||
printf("Warning: Sent more than %d packets (%d). " | |||||
"Acknowledgements will fail unless the size of " | |||||
"rcvd_acks/want_acks is increased.\n", | |||||
NETDUMP_MAX_IN_FLIGHT, i); | |||||
/* | |||||
* Wait for acks. A *real* window would speed things up considerably. | |||||
*/ | |||||
polls = 0; | |||||
while (rcvd_acks != want_acks) { | |||||
if (polls++ > nd_polls) { | |||||
if (retries++ > nd_retries) | |||||
return (ETIMEDOUT); | |||||
printf(". "); | |||||
goto retransmit; | |||||
} | |||||
netdump_network_poll(); | |||||
DELAY(500); | |||||
} | |||||
nd_seqno += i; | |||||
return (0); | |||||
} | |||||
/* | |||||
* Handler for IP packets: checks their sanity and then processes any netdump | |||||
* ACK packets it finds. | |||||
* | |||||
* It needs to replicate partially the behaviour of ip_input() and | |||||
* udp_input(). | |||||
* | |||||
* Parameters: | |||||
* mb a pointer to an mbuf * containing the packet received | |||||
* Updates *mb if m_pullup et al change the pointer | |||||
* Assumes the calling function will take care of freeing the mbuf | |||||
*/ | |||||
static void | |||||
netdump_handle_ip(struct mbuf **mb) | |||||
{ | |||||
struct ip *ip; | |||||
struct udpiphdr *udp; | |||||
struct netdump_ack *nd_ack; | |||||
struct mbuf *m; | |||||
int rcv_ackno; | |||||
unsigned short hlen; | |||||
/* IP processing. */ | |||||
m = *mb; | |||||
if (m->m_pkthdr.len < sizeof(struct ip)) { | |||||
NETDDEBUG("dropping packet too small for IP header\n"); | |||||
return; | |||||
} | |||||
if (m->m_len < sizeof(struct ip)) { | |||||
m = m_pullup(m, sizeof(struct ip)); | |||||
*mb = m; | |||||
if (m == NULL) { | |||||
NETDDEBUG("m_pullup failed\n"); | |||||
return; | |||||
} | |||||
} | |||||
ip = mtod(m, struct ip *); | |||||
/* IP version. */ | |||||
if (ip->ip_v != IPVERSION) { | |||||
NETDDEBUG("bad IP version %d\n", ip->ip_v); | |||||
return; | |||||
} | |||||
/* Header length. */ | |||||
hlen = ip->ip_hl << 2; | |||||
if (hlen < sizeof(struct ip)) { | |||||
NETDDEBUG("bad IP header length (%hu)\n", hlen); | |||||
return; | |||||
} | |||||
if (hlen > m->m_len) { | |||||
m = m_pullup(m, hlen); | |||||
*mb = m; | |||||
if (m == NULL) { | |||||
NETDDEBUG("m_pullup failed\n"); | |||||
return; | |||||
} | |||||
ip = mtod(m, struct ip *); | |||||
} | |||||
/* Ignore packets with IP options. */ | |||||
if (hlen > sizeof(struct ip)) { | |||||
NETDDEBUG("drop packet with IP options\n"); | |||||
return; | |||||
} | |||||
#ifdef INVARIANTS | |||||
if (((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || | |||||
(ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) && | |||||
(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { | |||||
NETDDEBUG("Bad IP header (RFC1122)\n"); | |||||
return; | |||||
} | |||||
#endif | |||||
/* Checksum. */ | |||||
if ((m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) != 0) { | |||||
if ((m->m_pkthdr.csum_flags & CSUM_IP_VALID) == 0) { | |||||
NETDDEBUG("bad IP checksum\n"); | |||||
return; | |||||
} | |||||
} else { | |||||
/* XXX */ ; | |||||
} | |||||
/* Convert fields to host byte order. */ | |||||
ip->ip_len = ntohs(ip->ip_len); | |||||
if (ip->ip_len < hlen) { | |||||
NETDDEBUG("IP packet smaller (%hu) than header (%hu)\n", | |||||
ip->ip_len, hlen); | |||||
return; | |||||
} | |||||
if (m->m_pkthdr.len < ip->ip_len) { | |||||
NETDDEBUG("IP packet bigger (%hu) than ethernet packet (%d)\n", | |||||
ip->ip_len, m->m_pkthdr.len); | |||||
return; | |||||
} | |||||
if (m->m_pkthdr.len > ip->ip_len) { | |||||
/* Truncate the packet to the IP length. */ | |||||
if (m->m_len == m->m_pkthdr.len) { | |||||
m->m_len = ip->ip_len; | |||||
m->m_pkthdr.len = ip->ip_len; | |||||
} else | |||||
m_adj(m, ip->ip_len - m->m_pkthdr.len); | |||||
} | |||||
ip->ip_off = ntohs(ip->ip_off); | |||||
/* Check that the source is the server's IP. */ | |||||
if (ip->ip_src.s_addr != nd_server.s_addr) { | |||||
NETDDEBUG("drop packet not from server (from 0x%x)\n", | |||||
ip->ip_src.s_addr); | |||||
return; | |||||
} | |||||
/* Check if the destination IP is ours. */ | |||||
if (ip->ip_dst.s_addr != nd_client.s_addr) { | |||||
NETDDEBUGV("drop packet not to our IP\n"); | |||||
return; | |||||
} | |||||
if (ip->ip_p != IPPROTO_UDP) { | |||||
NETDDEBUG("drop non-UDP packet\n"); | |||||
return; | |||||
} | |||||
/* Do not deal with fragments. */ | |||||
if ((ip->ip_off & (IP_MF | IP_OFFMASK)) != 0) { | |||||
NETDDEBUG("drop fragmented packet\n"); | |||||
return; | |||||
} | |||||
/* UDP custom is to have packet length not include IP header. */ | |||||
ip->ip_len -= hlen; | |||||
/* UDP processing. */ | |||||
/* Get IP and UDP headers together, along with the netdump packet. */ | |||||
if (m->m_pkthdr.len < | |||||
sizeof(struct udpiphdr) + sizeof(struct netdump_ack)) { | |||||
NETDDEBUG("ignoring small packet\n"); | |||||
return; | |||||
} | |||||
if (m->m_len < sizeof(struct udpiphdr) + sizeof(struct netdump_ack)) { | |||||
m = m_pullup(m, sizeof(struct udpiphdr) + | |||||
sizeof(struct netdump_ack)); | |||||
*mb = m; | |||||
if (m == NULL) { | |||||
NETDDEBUG("m_pullup failed\n"); | |||||
return; | |||||
} | |||||
} | |||||
udp = mtod(m, struct udpiphdr *); | |||||
if (ntohs(udp->ui_u.uh_dport) != NETDUMP_ACKPORT) { | |||||
NETDDEBUG("not on the netdump port.\n"); | |||||
return; | |||||
} | |||||
/* Netdump processing. */ | |||||
/* | |||||
* Packet is meant for us. Extract the ack sequence number and the | |||||
* port number if necessary. | |||||
*/ | |||||
nd_ack = (struct netdump_ack *)(mtod(m, caddr_t) + | |||||
sizeof(struct udpiphdr)); | |||||
rcv_ackno = ntohl(nd_ack->na_seqno); | |||||
if (nd_server_port == NETDUMP_PORT) | |||||
nd_server_port = ntohs(udp->ui_u.uh_sport); | |||||
if (rcv_ackno >= nd_seqno + NETDUMP_MAX_IN_FLIGHT) | |||||
printf("%s: ACK %d too far in future!\n", __func__, rcv_ackno); | |||||
else if (rcv_ackno >= nd_seqno) { | |||||
/* We're interested in this ack. Record it. */ | |||||
rcvd_acks |= 1 << (rcv_ackno - nd_seqno); | |||||
} | |||||
} | |||||
/* | |||||
* Handler for ARP packets: checks their sanity and then | |||||
* 1. If the ARP is a request for our IP, respond with our MAC address | |||||
* 2. If the ARP is a response from our server, record its MAC address | |||||
* | |||||
* It needs to replicate partially the behaviour of arpintr() and | |||||
* in_arpinput(). | |||||
* | |||||
* Parameters: | |||||
* mb a pointer to an mbuf * containing the packet received | |||||
* Updates *mb if m_pullup et al change the pointer | |||||
* Assumes the calling function will take care of freeing the mbuf | |||||
*/ | |||||
static void | |||||
netdump_handle_arp(struct mbuf **mb) | |||||
{ | |||||
char buf[INET_ADDRSTRLEN]; | |||||
struct in_addr isaddr, itaddr, myaddr; | |||||
struct ether_addr dst; | |||||
struct mbuf *m; | |||||
struct arphdr *ah; | |||||
struct ifnet *ifp; | |||||
uint8_t *enaddr; | |||||
int req_len, op; | |||||
m = *mb; | |||||
ifp = m->m_pkthdr.rcvif; | |||||
if (m->m_len < sizeof(struct arphdr)) { | |||||
m = m_pullup(m, sizeof(struct arphdr)); | |||||
*mb = m; | |||||
if (m == NULL) { | |||||
NETDDEBUG("runt packet: m_pullup failed\n"); | |||||
return; | |||||
} | |||||
} | |||||
ah = mtod(m, struct arphdr *); | |||||
if (ntohs(ah->ar_hrd) != ARPHRD_ETHER) { | |||||
NETDDEBUG("unknown hardware address 0x%2D)\n", | |||||
(unsigned char *)&ah->ar_hrd, ""); | |||||
return; | |||||
} | |||||
if (ntohs(ah->ar_pro) != ETHERTYPE_IP) { | |||||
NETDDEBUG("drop ARP for unknown protocol %d\n", | |||||
ntohs(ah->ar_pro)); | |||||
return; | |||||
} | |||||
req_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); | |||||
if (m->m_len < req_len) { | |||||
m = m_pullup(m, req_len); | |||||
*mb = m; | |||||
if (m == NULL) { | |||||
NETDDEBUG("runt packet: m_pullup failed\n"); | |||||
return; | |||||
} | |||||
} | |||||
ah = mtod(m, struct arphdr *); | |||||
op = ntohs(ah->ar_op); | |||||
memcpy(&isaddr, ar_spa(ah), sizeof(isaddr)); | |||||
memcpy(&itaddr, ar_tpa(ah), sizeof(itaddr)); | |||||
enaddr = (uint8_t *)IF_LLADDR(ifp); | |||||
myaddr = nd_client; | |||||
if (memcmp(ar_sha(ah), enaddr, ifp->if_addrlen) == 0) { | |||||
NETDDEBUG("ignoring ARP from myself\n"); | |||||
return; | |||||
} | |||||
if (isaddr.s_addr == nd_client.s_addr) { | |||||
printf("%s: %*D is using my IP address %s!\n", __func__, | |||||
ifp->if_addrlen, (u_char *)ar_sha(ah), ":", | |||||
inet_ntoa_r(isaddr, buf)); | |||||
return; | |||||
} | |||||
if (memcmp(ar_sha(ah), ifp->if_broadcastaddr, ifp->if_addrlen) == 0) { | |||||
NETDDEBUG("ignoring ARP from broadcast address\n"); | |||||
return; | |||||
} | |||||
if (op == ARPOP_REPLY) { | |||||
if (isaddr.s_addr != nd_gateway.s_addr && | |||||
isaddr.s_addr != nd_server.s_addr) { | |||||
inet_ntoa_r(isaddr, buf); | |||||
NETDDEBUG( | |||||
"ignoring ARP reply from %s (not netdump server)\n", | |||||
buf); | |||||
return; | |||||
} | |||||
memcpy(nd_gw_mac.octet, ar_sha(ah), | |||||
min(ah->ar_hln, ETHER_ADDR_LEN)); | |||||
have_gw_mac = 1; | |||||
NETDDEBUG("got server MAC address %6D\n", nd_gw_mac.octet, ":"); | |||||
return; | |||||
} | |||||
if (op != ARPOP_REQUEST) { | |||||
NETDDEBUG("ignoring ARP non-request/reply\n"); | |||||
return; | |||||
} | |||||
if (itaddr.s_addr != nd_client.s_addr) { | |||||
NETDDEBUG("ignoring ARP not to our IP\n"); | |||||
return; | |||||
} | |||||
memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); | |||||
memcpy(ar_sha(ah), enaddr, ah->ar_hln); | |||||
memcpy(ar_tpa(ah), ar_spa(ah), ah->ar_pln); | |||||
memcpy(ar_spa(ah), &itaddr, ah->ar_pln); | |||||
ah->ar_op = htons(ARPOP_REPLY); | |||||
ah->ar_pro = htons(ETHERTYPE_IP); | |||||
m->m_flags &= ~(M_BCAST|M_MCAST); | |||||
m->m_len = arphdr_len(ah); | |||||
m->m_pkthdr.len = m->m_len; | |||||
memcpy(dst.octet, ar_tha(ah), ETHER_ADDR_LEN); | |||||
netdump_ether_output(m, ifp, dst, ETHERTYPE_ARP); | |||||
*mb = NULL; | |||||
} | |||||
/* | |||||
* Handler for incoming packets directly from the network adapter | |||||
* Identifies the packet type (IP or ARP) and passes it along to one of the | |||||
* helper functions netdump_handle_ip or netdump_handle_arp. | |||||
* | |||||
* It needs to replicate partially the behaviour of ether_input() and | |||||
* ether_demux(). | |||||
* | |||||
* Parameters: | |||||
* ifp the interface the packet came from (should be nd_ifp) | |||||
* m an mbuf containing the packet received | |||||
*/ | |||||
static void | |||||
netdump_pkt_in(struct ifnet *ifp, struct mbuf *m) | |||||
{ | |||||
struct ifreq ifr; | |||||
struct ether_header *eh; | |||||
u_short etype; | |||||
/* Ethernet processing. */ | |||||
if ((m->m_flags & M_PKTHDR) == 0) { | |||||
NETDDEBUG_IF(ifp, "discard frame without packet header\n"); | |||||
goto done; | |||||
} | |||||
if (m->m_len < ETHER_HDR_LEN) { | |||||
NETDDEBUG_IF(ifp, | |||||
"discard frame without leading eth header (len %u pktlen %u)\n", | |||||
m->m_len, m->m_pkthdr.len); | |||||
goto done; | |||||
} | |||||
if ((m->m_flags & M_HASFCS) != 0) { | |||||
m_adj(m, -ETHER_CRC_LEN); | |||||
m->m_flags &= ~M_HASFCS; | |||||
} | |||||
eh = mtod(m, struct ether_header *); | |||||
etype = ntohs(eh->ether_type); | |||||
if ((m->m_flags & M_VLANTAG) != 0 || etype == ETHERTYPE_VLAN) { | |||||
NETDDEBUG_IF(ifp, "ignoring vlan packets\n"); | |||||
goto done; | |||||
} | |||||
if (if_gethwaddr(ifp, &ifr) != 0) { | |||||
NETDDEBUG_IF(ifp, "failed to get hw addr for interface\n"); | |||||
goto done; | |||||
} | |||||
if (memcmp(ifr.ifr_addr.sa_data, eh->ether_dhost, | |||||
ETHER_ADDR_LEN) != 0) { | |||||
NETDDEBUG_IF(ifp, | |||||
"discard frame with incorrect destination addr\n"); | |||||
goto done; | |||||
} | |||||
/* Done ethernet processing. Strip off the ethernet header. */ | |||||
m_adj(m, ETHER_HDR_LEN); | |||||
switch (etype) { | |||||
case ETHERTYPE_ARP: | |||||
netdump_handle_arp(&m); | |||||
break; | |||||
case ETHERTYPE_IP: | |||||
netdump_handle_ip(&m); | |||||
break; | |||||
default: | |||||
NETDDEBUG_IF(ifp, "dropping unknown ethertype %hu\n", etype); | |||||
break; | |||||
} | |||||
done: | |||||
if (m != NULL) | |||||
m_freem(m); | |||||
} | |||||
/* | |||||
* After trapping, instead of assuming that most of the network stack is sane, | |||||
* we just poll the driver directly for packets. | |||||
*/ | |||||
static void | |||||
netdump_network_poll(void) | |||||
{ | |||||
MPASS(nd_ifp != NULL); | |||||
nd_ifp->if_netdump_methods->nd_poll(nd_ifp, 1000); | |||||
} | |||||
/*- | |||||
* Dumping specific primitives. | |||||
*/ | |||||
/* | |||||
* Callback from dumpsys() to dump a chunk of memory. | |||||
* Copies it out to our static buffer then sends it across the network. | |||||
* Detects the initial KDH and makes sure it is given a special packet type. | |||||
* | |||||
* Parameters: | |||||
* priv Unused. Optional private pointer. | |||||
* virtual Virtual address (where to read the data from) | |||||
* physical Unused. Physical memory address. | |||||
* offset Offset from start of core file | |||||
* length Data length | |||||
* | |||||
* Return value: | |||||
* 0 on success | |||||
* errno on error | |||||
*/ | |||||
static int | |||||
netdump_dumper(void *priv __unused, void *virtual, | |||||
vm_offset_t physical __unused, off_t offset, size_t length) | |||||
{ | |||||
int error; | |||||
NETDDEBUGV("netdump_dumper(NULL, %p, NULL, %ju, %zu)\n", | |||||
virtual, (uintmax_t)offset, length); | |||||
if (virtual == NULL) { | |||||
if (dump_failed != 0) | |||||
printf("failed to dump the kernel core\n"); | |||||
else if (netdump_send(NETDUMP_FINISHED, 0, NULL, 0) != 0) | |||||
printf("failed to close the transaction\n"); | |||||
else | |||||
printf("\nnetdump finished.\n"); | |||||
netdump_cleanup(); | |||||
return (0); | |||||
} | |||||
if (length > sizeof(nd_buf)) | |||||
return (ENOSPC); | |||||
memmove(nd_buf, virtual, length); | |||||
error = netdump_send(NETDUMP_VMCORE, offset, nd_buf, length); | |||||
if (error != 0) { | |||||
dump_failed = 1; | |||||
return (error); | |||||
} | |||||
return (0); | |||||
} | |||||
/* | |||||
* Perform any initalization needed prior to transmitting the kernel core. | |||||
*/ | |||||
static int | |||||
netdump_start(struct dumperinfo *di) | |||||
{ | |||||
char *path; | |||||
char buf[INET_ADDRSTRLEN]; | |||||
uint32_t len; | |||||
int error; | |||||
error = 0; | |||||
/* Check if the dumping is allowed to continue. */ | |||||
if (nd_enabled == 0) | |||||
return (EINVAL); | |||||
if (panicstr == NULL) { | |||||
printf( | |||||
"netdump_start: netdump may only be used after a panic\n"); | |||||
return (EINVAL); | |||||
} | |||||
MPASS(nd_ifp != NULL); | |||||
if (nd_server.s_addr == INADDR_ANY) { | |||||
printf("netdump_start: can't netdump; no server IP given\n"); | |||||
return (EINVAL); | |||||
} | |||||
if (nd_client.s_addr == INADDR_ANY) { | |||||
printf("netdump_start: can't netdump; no client IP given\n"); | |||||
return (EINVAL); | |||||
} | |||||
/* We start dumping at offset 0. */ | |||||
di->dumpoff = 0; | |||||
nd_seqno = 1; | |||||
/* | |||||
* nd_server_port could have switched after the first ack the | |||||
* first time it gets called. Adjust it accordingly. | |||||
*/ | |||||
nd_server_port = NETDUMP_PORT; | |||||
/* Switch to the netdump mbuf zones. */ | |||||
netdump_mbuf_dump(); | |||||
nd_ifp->if_netdump_methods->nd_event(nd_ifp, NETDUMP_START); | |||||
/* Make the card use *our* receive callback. */ | |||||
drv_if_input = nd_ifp->if_input; | |||||
nd_ifp->if_input = netdump_pkt_in; | |||||
if (nd_gateway.s_addr == INADDR_ANY) { | |||||
restore_gw_addr = 1; | |||||
nd_gateway.s_addr = nd_server.s_addr; | |||||
} | |||||
printf("netdump in progress. searching for server...\n"); | |||||
if (netdump_arp_gw()) { | |||||
printf("failed to locate server MAC address\n"); | |||||
error = EINVAL; | |||||
goto trig_abort; | |||||
} | |||||
if (nd_path[0] != '\0') { | |||||
path = nd_path; | |||||
len = strlen(path) + 1; | |||||
} else { | |||||
path = NULL; | |||||
len = 0; | |||||
} | |||||
if (netdump_send(NETDUMP_HERALD, 0, path, len) != 0) { | |||||
printf("failed to contact netdump server\n"); | |||||
error = EINVAL; | |||||
goto trig_abort; | |||||
} | |||||
printf("netdumping to %s (%6D)\n", inet_ntoa_r(nd_server, buf), | |||||
nd_gw_mac.octet, ":"); | |||||
return (0); | |||||
trig_abort: | |||||
netdump_cleanup(); | |||||
return (error); | |||||
} | |||||
static int | |||||
netdump_write_headers(struct dumperinfo *di, struct kerneldumpheader *kdh, | |||||
void *key, uint32_t keysize) | |||||
{ | |||||
int error; | |||||
memcpy(nd_buf, kdh, sizeof(*kdh)); | |||||
error = netdump_send(NETDUMP_KDH, 0, nd_buf, sizeof(*kdh)); | |||||
if (error == 0 && keysize > 0) { | |||||
if (keysize > sizeof(nd_buf)) | |||||
return (EINVAL); | |||||
memcpy(nd_buf, key, keysize); | |||||
error = netdump_send(NETDUMP_EKCD_KEY, 0, nd_buf, keysize); | |||||
} | |||||
return (error); | |||||
} | |||||
/* | |||||
* Cleanup routine for a possibly failed netdump. | |||||
*/ | |||||
static void | |||||
netdump_cleanup(void) | |||||
{ | |||||
if (restore_gw_addr != 0) { | |||||
nd_gateway.s_addr = INADDR_ANY; | |||||
restore_gw_addr = 0; | |||||
} | |||||
if (drv_if_input != NULL) { | |||||
nd_ifp->if_input = drv_if_input; | |||||
drv_if_input = NULL; | |||||
} | |||||
nd_ifp->if_netdump_methods->nd_event(nd_ifp, NETDUMP_END); | |||||
} | |||||
/*- | |||||
* KLD specific code. | |||||
*/ | |||||
static struct cdevsw netdump_cdevsw = { | |||||
.d_version = D_VERSION, | |||||
.d_ioctl = netdump_ioctl, | |||||
.d_name = "netdump", | |||||
}; | |||||
static struct cdev *netdump_cdev; | |||||
static int | |||||
netdump_configure(struct netdump_conf *conf) | |||||
{ | |||||
struct ifnet *ifp; | |||||
IFNET_RLOCK_NOSLEEP(); | |||||
TAILQ_FOREACH(ifp, &V_ifnet, if_link) { | |||||
if (strcmp(ifp->if_xname, conf->ndc_iface) == 0) | |||||
break; | |||||
} | |||||
/* XXX ref */ | |||||
IFNET_RUNLOCK_NOSLEEP(); | |||||
if (ifp == NULL) | |||||
return (ENOENT); | |||||
if ((if_getflags(ifp) & IFF_UP) == 0) | |||||
return (ENXIO); | |||||
if (!netdump_supported_nic(ifp) || ifp->if_type != IFT_ETHER) | |||||
return (EINVAL); | |||||
nd_ifp = ifp; | |||||
netdump_reinit(ifp); | |||||
memcpy(&nd_conf, conf, sizeof(nd_conf)); | |||||
nd_enabled = 1; | |||||
return (0); | |||||
} | |||||
/* | |||||
* Reinitialize the mbuf pool used by drivers while dumping. This is called | |||||
* from the generic ioctl handler for SIOCSIFMTU after the driver has | |||||
* reconfigured itself. | |||||
*/ | |||||
void | |||||
netdump_reinit(struct ifnet *ifp) | |||||
{ | |||||
int clsize, nmbuf, ncl, nrxr; | |||||
if (ifp != nd_ifp) | |||||
return; | |||||
ifp->if_netdump_methods->nd_init(ifp, &nrxr, &ncl, &clsize); | |||||
KASSERT(nrxr > 0, ("invalid receive ring count %d", nrxr)); | |||||
/* | |||||
* We need two headers per message on the transmit side. Multiply by | |||||
* four to give us some breathing room. | |||||
*/ | |||||
nmbuf = ncl * (4 + nrxr); | |||||
ncl *= nrxr; | |||||
netdump_mbuf_reinit(nmbuf, ncl, clsize); | |||||
} | |||||
/* | |||||
* ioctl(2) handler for the netdump device. This is currently only used to | |||||
* register netdump as a dump device. | |||||
* | |||||
* Parameters: | |||||
* dev, Unused. | |||||
* cmd, The ioctl to be handled. | |||||
* addr, The parameter for the ioctl. | |||||
* flags, Unused. | |||||
* td, The thread invoking this ioctl. | |||||
* | |||||
* Returns: | |||||
* 0 on success, and an errno value on failure. | |||||
*/ | |||||
static int | |||||
netdump_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t addr, | |||||
int flags __unused, struct thread *td) | |||||
{ | |||||
struct diocskerneldump_arg *kda; | |||||
struct dumperinfo dumper; | |||||
struct netdump_conf *conf; | |||||
uint8_t *encryptedkey; | |||||
int error; | |||||
u_int u; | |||||
error = 0; | |||||
switch (cmd) { | |||||
case DIOCSKERNELDUMP: | |||||
u = *(u_int *)addr; | |||||
if (u != 0) { | |||||
error = ENXIO; | |||||
break; | |||||
} | |||||
if (nd_enabled) { | |||||
nd_enabled = 0; | |||||
netdump_mbuf_drain(); | |||||
} | |||||
break; | |||||
case NETDUMPGCONF: | |||||
conf = (struct netdump_conf *)addr; | |||||
if (!nd_enabled) { | |||||
error = ENXIO; | |||||
break; | |||||
} | |||||
strlcpy(conf->ndc_iface, nd_ifp->if_xname, | |||||
sizeof(conf->ndc_iface)); | |||||
memcpy(&conf->ndc_server, &nd_server, sizeof(nd_server)); | |||||
memcpy(&conf->ndc_client, &nd_client, sizeof(nd_client)); | |||||
memcpy(&conf->ndc_gateway, &nd_gateway, sizeof(nd_gateway)); | |||||
break; | |||||
case NETDUMPSCONF: | |||||
conf = (struct netdump_conf *)addr; | |||||
encryptedkey = NULL; | |||||
kda = &conf->ndc_kda; | |||||
conf->ndc_iface[sizeof(conf->ndc_iface) - 1] = '\0'; | |||||
if (kda->kda_enable == 0) { | |||||
if (nd_enabled) { | |||||
error = clear_dumper(td); | |||||
if (error == 0) | |||||
nd_enabled = 0; | |||||
} | |||||
break; | |||||
} | |||||
error = netdump_configure(conf); | |||||
if (error != 0) | |||||
break; | |||||
if (kda->kda_encryption != KERNELDUMP_ENC_NONE) { | |||||
if (kda->kda_encryptedkeysize <= 0 || | |||||
kda->kda_encryptedkeysize > | |||||
KERNELDUMP_ENCKEY_MAX_SIZE) | |||||
return (EINVAL); | |||||
encryptedkey = malloc(kda->kda_encryptedkeysize, M_TEMP, | |||||
M_WAITOK); | |||||
error = copyin(kda->kda_encryptedkey, encryptedkey, | |||||
kda->kda_encryptedkeysize); | |||||
if (error != 0) { | |||||
free(encryptedkey, M_TEMP); | |||||
return (error); | |||||
} | |||||
} | |||||
dumper.dumper_start = netdump_start; | |||||
dumper.dumper_hdr = netdump_write_headers; | |||||
dumper.dumper = netdump_dumper; | |||||
dumper.priv = NULL; | |||||
dumper.blocksize = NETDUMP_DATASIZE; | |||||
dumper.maxiosize = MAXDUMPPGS * PAGE_SIZE; | |||||
dumper.mediaoffset = 0; | |||||
dumper.mediasize = 0; | |||||
error = set_dumper(&dumper, conf->ndc_iface, td, | |||||
kda->kda_compression, kda->kda_encryption, | |||||
kda->kda_key, kda->kda_encryptedkeysize, | |||||
encryptedkey); | |||||
if (encryptedkey != NULL) { | |||||
explicit_bzero(encryptedkey, kda->kda_encryptedkeysize); | |||||
free(encryptedkey, M_TEMP); | |||||
} | |||||
if (error != 0) | |||||
nd_enabled = 0; | |||||
break; | |||||
default: | |||||
error = EINVAL; | |||||
break; | |||||
} | |||||
return (error); | |||||
} | |||||
/* | |||||
* Called upon system init or kld load. Initializes the netdump parameters to | |||||
* sane defaults (locates the first available NIC and uses the first IPv4 IP on | |||||
* that card as the client IP). Leaves the server IP unconfigured. | |||||
* | |||||
* Parameters: | |||||
* mod, Unused. | |||||
* what, The module event type. | |||||
* priv, Unused. | |||||
* | |||||
* Returns: | |||||
* int, An errno value if an error occured, 0 otherwise. | |||||
*/ | |||||
static int | |||||
netdump_modevent(module_t mod __unused, int what, void *priv __unused) | |||||
{ | |||||
struct netdump_conf conf; | |||||
char *arg; | |||||
int error; | |||||
error = 0; | |||||
switch (what) { | |||||
case MOD_LOAD: | |||||
error = make_dev_p(MAKEDEV_WAITOK, &netdump_cdev, | |||||
&netdump_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "netdump"); | |||||
if (error != 0) | |||||
return (error); | |||||
if ((arg = kern_getenv("net.dump.iface")) != NULL) { | |||||
strlcpy(conf.ndc_iface, arg, sizeof(conf.ndc_iface)); | |||||
freeenv(arg); | |||||
if ((arg = kern_getenv("net.dump.server")) != NULL) { | |||||
inet_aton(arg, &conf.ndc_server); | |||||
freeenv(arg); | |||||
} | |||||
if ((arg = kern_getenv("net.dump.client")) != NULL) { | |||||
inet_aton(arg, &conf.ndc_server); | |||||
freeenv(arg); | |||||
} | |||||
if ((arg = kern_getenv("net.dump.gateway")) != NULL) { | |||||
inet_aton(arg, &conf.ndc_server); | |||||
freeenv(arg); | |||||
} | |||||
/* Ignore errors; we print a message to the console. */ | |||||
(void)netdump_configure(&conf); | |||||
} | |||||
break; | |||||
case MOD_UNLOAD: | |||||
destroy_dev(netdump_cdev); | |||||
if (nd_enabled) { | |||||
printf("netdump: disabling dump device for unload\n"); | |||||
(void)clear_dumper(curthread); | |||||
nd_enabled = 0; | |||||
} | |||||
break; | |||||
default: | |||||
error = EOPNOTSUPP; | |||||
break; | |||||
} | |||||
return (error); | |||||
} | |||||
static moduledata_t netdump_mod = { | |||||
"netdump", | |||||
netdump_modevent, | |||||
NULL, | |||||
}; | |||||
MODULE_VERSION(netdump, 1); | |||||
DECLARE_MODULE(netdump, netdump_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); |