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first merge of NATT code

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This commit is contained in:
Martin Willi
2006-06-22 06:36:28 +00:00
parent 6bf1352032
commit 1396815afb
46 changed files with 2973 additions and 772 deletions
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src/charon/threads/kernel_interface.c
+385 -256
View File
@@ -6,6 +6,7 @@
*/
/*
* Copyright (C) 2006 Tobias Brunner, Daniel Roethlisberger
* Copyright (C) 2005 Jan Hutter, Martin Willi
* Hochschule fuer Technik Rapperswil
* Copyright (C) 2003 Herbert Xu.
@@ -26,6 +27,7 @@
#include <sys/types.h>
#include <sys/socket.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <pthread.h>
#include <unistd.h>
#include <fcntl.h>
@@ -45,69 +47,12 @@
#define SPD_PRIORITY 1024
#define XFRM_DATA_LENGTH 1024
#define BUFFER_SIZE 1024
typedef struct xfrm_data_t xfrm_data_t;
/**
* Lenght/Type/data struct for userdata in xfrm
* We dont use the "I-don't-know-where-they-come-from"-structs
* used in the kernel.
*/
struct xfrm_data_t {
/**
* length of the data
*/
u_int16_t length;
/**
* type of data
*/
u_int16_t type;
/**
* and the data itself, for different purposes
*/
union {
/** algorithm */
struct xfrm_algo algo;
/** policy tmpl */
struct xfrm_user_tmpl tmpl;
};
};
typedef struct netlink_message_t netlink_message_t;
/**
* Representation of ANY netlink message used
*/
struct netlink_message_t {
/**
* header of the netlink message
*/
struct nlmsghdr hdr;
union {
/** error message */
struct nlmsgerr e;
/** message for spi allocation */
struct xfrm_userspi_info spi;
/** message for SA manipulation */
struct xfrm_usersa_id sa_id;
/** message for SA installation */
struct xfrm_usersa_info sa;
/** message for policy manipulation */
struct xfrm_userpolicy_id policy_id;
/** message for policy installation */
struct xfrm_userpolicy_info policy;
/** expire message sent from kernel */
struct xfrm_user_expire expire;
};
u_int8_t data[XFRM_DATA_LENGTH];
};
/* returns a pointer to the first rtattr following the nlmsghdr *nlh and the 'usual' netlink data x like 'struct xfrm_usersa_info' */
#define XFRM_RTA(nlh, x) ((struct rtattr*)(NLMSG_DATA(nlh) + NLMSG_ALIGN(sizeof(x))))
/* returns the total size of attached rta data (after 'usual' netlink data x like 'struct xfrm_usersa_info') */
#define XFRM_PAYLOAD(nlh, x) NLMSG_PAYLOAD(nlh, sizeof(x))
typedef struct kernel_algorithm_t kernel_algorithm_t;
@@ -249,7 +194,7 @@ struct private_kernel_interface_t {
/**
* Sends a netlink_message_t down to the kernel and wait for reply.
*/
status_t (*send_message) (private_kernel_interface_t *this, netlink_message_t *request, netlink_message_t **response);
status_t (*send_message) (private_kernel_interface_t *this, struct nlmsghdr *request, struct nlmsghdr **response);
};
/**
@@ -260,48 +205,53 @@ static status_t get_spi(private_kernel_interface_t *this,
protocol_id_t protocol, u_int32_t reqid,
u_int32_t *spi)
{
netlink_message_t request, *response;
unsigned char request[BUFFER_SIZE];
struct nlmsghdr *response;
memset(&request, 0, sizeof(request));
status_t status = SUCCESS;
this->logger->log(this->logger, CONTROL|LEVEL1, "Getting SPI for reqid %d", reqid);
this->logger->log(this->logger, CONTROL|LEVEL2, "getting spi");
memset(&request, 0, sizeof(request));
request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.spi)));
request.hdr.nlmsg_flags = NLM_F_REQUEST;
request.hdr.nlmsg_type = XFRM_MSG_ALLOCSPI;
request.spi.info.saddr = src->get_xfrm_addr(src);
request.spi.info.id.daddr = dest->get_xfrm_addr(dest);
request.spi.info.mode = TRUE; /* tunnel mode */
request.spi.info.reqid = reqid;
request.spi.info.id.proto = (protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH;
request.spi.info.family = PF_INET;
request.spi.min = 0xc0000000;
request.spi.max = 0xcFFFFFFF;
struct nlmsghdr *hdr = (struct nlmsghdr*)request;
hdr->nlmsg_flags = NLM_F_REQUEST;
hdr->nlmsg_type = XFRM_MSG_ALLOCSPI;
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userspi_info));
struct xfrm_userspi_info *userspi = (struct xfrm_userspi_info*)NLMSG_DATA(hdr);
userspi->info.saddr = src->get_xfrm_addr(src);
userspi->info.id.daddr = dest->get_xfrm_addr(dest);
userspi->info.id.proto = (protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH;
userspi->info.mode = TRUE; /* tunnel mode */
userspi->info.reqid = reqid;
userspi->info.family = src->get_family(src);
userspi->min = 0xc0000000;
userspi->max = 0xcFFFFFFF;
if (this->send_message(this, &request, &response) != SUCCESS)
if (this->send_message(this, hdr, &response) != SUCCESS)
{
this->logger->log(this->logger, ERROR, "netlink communication failed");
return FAILED;
}
else if (response->hdr.nlmsg_type == NLMSG_ERROR)
else if (response->nlmsg_type == NLMSG_ERROR)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_ALLOCSPI got an error: %s",
strerror(-response->e.error));
strerror(-((struct nlmsgerr*)NLMSG_DATA(response))->error));
status = FAILED;
}
else if (response->hdr.nlmsg_type != XFRM_MSG_NEWSA)
else if (response->nlmsg_type != XFRM_MSG_NEWSA)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_ALLOCSPI got a unknown reply");
status = FAILED;
}
else if (response->hdr.nlmsg_len < NLMSG_LENGTH(sizeof(response->sa)))
else if (response->nlmsg_len < NLMSG_LENGTH(sizeof(struct xfrm_usersa_info)))
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_ALLOCSPI got an invalid reply");
status = FAILED;
}
else
{
*spi = response->sa.id.spi;
*spi = ((struct xfrm_usersa_info*)NLMSG_DATA(response))->id.spi;
this->logger->log(this->logger, CONTROL|LEVEL1, "SPI is 0x%x", *spi);
}
free(response);
@@ -312,59 +262,56 @@ static status_t get_spi(private_kernel_interface_t *this,
/**
* Implementation of kernel_interface_t.add_sa.
*/
static status_t add_sa( private_kernel_interface_t *this,
host_t *me,
host_t *other,
u_int32_t spi,
protocol_id_t protocol,
u_int32_t reqid,
u_int64_t expire_soft,
u_int64_t expire_hard,
algorithm_t *enc_alg,
algorithm_t *int_alg,
prf_plus_t *prf_plus,
bool replace)
static status_t add_sa(private_kernel_interface_t *this,
host_t *me, host_t *other,
u_int32_t spi, protocol_id_t protocol,
u_int32_t reqid,
u_int64_t expire_soft, u_int64_t expire_hard,
algorithm_t *enc_alg, algorithm_t *int_alg,
prf_plus_t *prf_plus, natt_conf_t *natt,
bool replace)
{
netlink_message_t request, *response;
status_t status = SUCCESS;
int key_size;
unsigned char request[BUFFER_SIZE];
struct nlmsghdr *response;
char *alg_name;
size_t key_size;
memset(&request, 0, sizeof(request));
status_t status = SUCCESS;
this->logger->log(this->logger, CONTROL|LEVEL1, "Adding %s SA with SPI 0x%x, reqid %d to kernel",
mapping_find(protocol_id_m, protocol), htonl(spi), reqid);
this->logger->log(this->logger, CONTROL|LEVEL2, "adding SA");
struct nlmsghdr *hdr = (struct nlmsghdr*)request;
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
hdr->nlmsg_type = replace ? XFRM_MSG_UPDSA : XFRM_MSG_NEWSA;
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
request.hdr.nlmsg_type = replace ? XFRM_MSG_UPDSA : XFRM_MSG_NEWSA;
struct xfrm_usersa_info *sa = (struct xfrm_usersa_info*)NLMSG_DATA(hdr);
sa->saddr = me->get_xfrm_addr(me);
sa->id.daddr = other->get_xfrm_addr(other);
request.sa.saddr = me->get_xfrm_addr(me);
request.sa.id.daddr = other->get_xfrm_addr(other);
request.sa.id.spi = spi;
request.sa.id.proto = (protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH;
request.sa.family = me->get_family(me);
request.sa.mode = TRUE; /* tunnel mode */
request.sa.replay_window = 32;
request.sa.reqid = reqid;
sa->id.spi = spi;
sa->id.proto = (protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH;
sa->family = me->get_family(me);
sa->mode = TRUE; /* tunnel mode */
sa->replay_window = 32;
sa->reqid = reqid;
/* we currently do not expire SAs by volume/packet count */
request.sa.lft.soft_byte_limit = XFRM_INF;
request.sa.lft.hard_byte_limit = XFRM_INF;
request.sa.lft.soft_packet_limit = XFRM_INF;
request.sa.lft.hard_packet_limit = XFRM_INF;
sa->lft.soft_byte_limit = XFRM_INF;
sa->lft.hard_byte_limit = XFRM_INF;
sa->lft.soft_packet_limit = XFRM_INF;
sa->lft.hard_packet_limit = XFRM_INF;
/* we use lifetimes since added, not since used */
request.sa.lft.soft_add_expires_seconds = expire_soft;
request.sa.lft.hard_add_expires_seconds = expire_hard;
request.sa.lft.soft_use_expires_seconds = 0;
request.sa.lft.hard_use_expires_seconds = 0;
request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.sa)));
sa->lft.soft_add_expires_seconds = expire_soft;
sa->lft.hard_add_expires_seconds = expire_hard;
sa->lft.soft_use_expires_seconds = 0;
sa->lft.hard_use_expires_seconds = 0;
if (enc_alg->algorithm != ENCR_UNDEFINED)
{
xfrm_data_t *data = (xfrm_data_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
struct rtattr *rthdr = (struct rtattr*)(request + hdr->nlmsg_len);
data->type = XFRMA_ALG_CRYPT;
rthdr->rta_type = XFRMA_ALG_CRYPT;
alg_name = lookup_algorithm(encryption_algs, enc_alg, &key_size);
if (alg_name == NULL)
{
@@ -374,22 +321,25 @@ static status_t add_sa( private_kernel_interface_t *this,
}
this->logger->log(this->logger, CONTROL|LEVEL2, " using encryption algorithm %s with key size %d",
mapping_find(encryption_algorithm_m, enc_alg->algorithm), key_size);
data->length = 4 + sizeof(data->algo) + key_size;
data->algo.alg_key_len = key_size;
request.hdr.nlmsg_len += data->length;
if (request.hdr.nlmsg_len > sizeof(request))
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + key_size);
hdr->nlmsg_len += rthdr->rta_len;
if (hdr->nlmsg_len > sizeof(request))
{
return FAILED;
}
strcpy(data->algo.alg_name, alg_name);
prf_plus->get_bytes(prf_plus, key_size / 8, data->algo.alg_key);
struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr);
algo->alg_key_len = key_size;
strcpy(algo->alg_name, alg_name);
prf_plus->get_bytes(prf_plus, key_size / 8, algo->alg_key);
}
if (int_alg->algorithm != AUTH_UNDEFINED)
{
xfrm_data_t *data = (xfrm_data_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
struct rtattr *rthdr = (struct rtattr*)(request + hdr->nlmsg_len);
data->type = XFRMA_ALG_AUTH;
rthdr->rta_type = XFRMA_ALG_AUTH;
alg_name = lookup_algorithm(integrity_algs, int_alg, &key_size);
if (alg_name == NULL)
{
@@ -399,33 +349,68 @@ static status_t add_sa( private_kernel_interface_t *this,
}
this->logger->log(this->logger, CONTROL|LEVEL2, " using integrity algorithm %s with key size %d",
mapping_find(integrity_algorithm_m, int_alg->algorithm), key_size);
data->length = 4 + sizeof(data->algo) + key_size;
data->algo.alg_key_len = key_size;
request.hdr.nlmsg_len += data->length;
if (request.hdr.nlmsg_len > sizeof(request))
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + key_size);
hdr->nlmsg_len += rthdr->rta_len;
if (hdr->nlmsg_len > sizeof(request))
{
return FAILED;
}
strcpy(data->algo.alg_name, alg_name);
prf_plus->get_bytes(prf_plus, key_size / 8, data->algo.alg_key);
struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr);
algo->alg_key_len = key_size;
strcpy(algo->alg_name, alg_name);
prf_plus->get_bytes(prf_plus, key_size / 8, algo->alg_key);
}
/* TODO: add IPComp here*/
/* TODO: add IPComp here */
if (this->send_message(this, &request, &response) != SUCCESS)
if (natt)
{
struct rtattr *rthdr = (struct rtattr*)(request + hdr->nlmsg_len);
rthdr->rta_type = XFRMA_ENCAP;
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl));
hdr->nlmsg_len += rthdr->rta_len;
if (hdr->nlmsg_len > sizeof(request))
{
return FAILED;
}
struct xfrm_encap_tmpl* encap = (struct xfrm_encap_tmpl*)RTA_DATA(rthdr);
/* UDP_ENCAP_ESPINUDP, see /usr/src/linux/include/linux/udp.h
* we could probably use 3 here (as pluto does) although the
* result is eventually the same. */
encap->encap_type = 2;
encap->encap_sport = ntohs(natt->sport);
encap->encap_dport = ntohs(natt->dport);
memset(&encap->encap_oa, 0, sizeof (xfrm_address_t));
/* encap_oa could probably be derived from the
* traffic selectors [rfc4306, p39]. In the netlink kernel implementation
* pluto does the same as we do here but it uses encap_oa in the
* pfkey implementation. BUT as /usr/src/linux/net/key/af_key.c indicates
* the kernel ignores it anyway
* -> does that mean that NAT-T encap doesn't work in transport mode?
* No. The reason the kernel ignores NAT-OA is that it recomputes
* (or, rather, just ignores) the checksum. If packets pass
* the IPSec checks it marks them "checksum ok" so OA isn't needed. */
}
if (this->send_message(this, hdr, &response) != SUCCESS)
{
this->logger->log(this->logger, ERROR, "netlink communication failed");
return FAILED;
}
else if (response->hdr.nlmsg_type != NLMSG_ERROR)
else if (response->nlmsg_type != NLMSG_ERROR)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_NEWSA not acknowledged");
status = FAILED;
}
else if (response->e.error)
else if (((struct nlmsgerr*)NLMSG_DATA(response))->error)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_NEWSA received error: %s",
strerror(-response->e.error));
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_NEWSA got an error: %s",
strerror(-((struct nlmsgerr*)NLMSG_DATA(response))->error));
status = FAILED;
}
@@ -433,43 +418,158 @@ static status_t add_sa( private_kernel_interface_t *this,
return status;
}
static status_t update_sa_hosts(
private_kernel_interface_t *this,
host_t *src, host_t *dst,
host_t *new_src, host_t *new_dst,
int src_changes, int dst_changes,
u_int32_t spi, protocol_id_t protocol)
{
unsigned char request[BUFFER_SIZE];
struct nlmsghdr *update, *response;
memset(&request, 0, sizeof(request));
status_t status = SUCCESS;
this->logger->log(this->logger, CONTROL|LEVEL2, "getting SA");
struct nlmsghdr *hdr = (struct nlmsghdr*)request;
hdr->nlmsg_flags = NLM_F_REQUEST ;
hdr->nlmsg_type = XFRM_MSG_GETSA;
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
struct xfrm_usersa_id *sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
sa_id->daddr = dst->get_xfrm_addr(dst);
sa_id->spi = spi;
sa_id->proto = (protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH;
sa_id->family = dst->get_family(dst);
if (this->send_message(this, hdr, &update) != SUCCESS)
{
this->logger->log(this->logger, ERROR, "netlink communication failed");
return FAILED;
}
else if (update->nlmsg_type == NLMSG_ERROR)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_GETSA got an error: %s",
strerror(-((struct nlmsgerr*)NLMSG_DATA(update))->error));
free(update);
return FAILED;
}
else if (update->nlmsg_type != XFRM_MSG_NEWSA)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_GETSA got a unknown reply");
free(update);
return FAILED;
}
else if (update->nlmsg_len < NLMSG_LENGTH(sizeof(struct xfrm_usersa_info)))
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_GETSA got an invalid reply");
free(update);
return FAILED;
}
this->logger->log(this->logger, CONTROL|LEVEL2, "updating SA");
update->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
update->nlmsg_type = XFRM_MSG_UPDSA;
struct xfrm_usersa_info *sa = (struct xfrm_usersa_info*)NLMSG_DATA(update);
if (src_changes & HOST_DIFF_ADDR)
{
sa->saddr = new_src->get_xfrm_addr(new_src);
}
if (dst_changes & HOST_DIFF_ADDR)
{
this->logger->log(this->logger, CONTROL|LEVEL2, "destination address changed! replacing SA");
update->nlmsg_type = XFRM_MSG_NEWSA;
sa->id.daddr = new_dst->get_xfrm_addr(new_dst);
}
if (src_changes & HOST_DIFF_PORT || dst_changes & HOST_DIFF_PORT)
{
struct rtattr *rthdr = XFRM_RTA(update, struct xfrm_usersa_info);
size_t rtsize = XFRM_PAYLOAD(update, struct xfrm_usersa_info);
while (RTA_OK(rthdr, rtsize))
{
if (rthdr->rta_type == XFRMA_ENCAP)
{
struct xfrm_encap_tmpl* encap = (struct xfrm_encap_tmpl*)RTA_DATA(rthdr);
encap->encap_sport = ntohs(new_src->get_port(new_src));
encap->encap_dport = ntohs(new_dst->get_port(new_dst));
break;
}
rthdr = RTA_NEXT(rthdr, rtsize);
}
}
if (this->send_message(this, update, &response) != SUCCESS)
{
this->logger->log(this->logger, ERROR, "netlink communication failed");
free(update);
return FAILED;
}
else if (response->nlmsg_type != NLMSG_ERROR)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_XXXSA not acknowledged");
status = FAILED;
}
else if (((struct nlmsgerr*)NLMSG_DATA(response))->error)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_XXXSA got an error: %s",
strerror(-((struct nlmsgerr*)NLMSG_DATA(response))->error));
status = FAILED;
}
else if (dst_changes & HOST_DIFF_ADDR)
{
this->logger->log(this->logger, CONTROL|LEVEL2, "deleting old SA");
status = this->public.del_sa(&this->public, dst, spi, protocol);
}
free(update);
free(response);
return status;
}
static status_t del_sa( private_kernel_interface_t *this,
host_t *dst,
u_int32_t spi,
protocol_id_t protocol)
{
netlink_message_t request, *response;
unsigned char request[BUFFER_SIZE];
struct nlmsghdr *response;
memset(&request, 0, sizeof(request));
status_t status = SUCCESS;
this->logger->log(this->logger, CONTROL|LEVEL1, "Deleting %s SA with SPI 0x%x from kernel",
mapping_find(protocol_id_m, protocol), htonl(spi));
this->logger->log(this->logger, CONTROL|LEVEL2, "deleting SA");
struct nlmsghdr *hdr = (struct nlmsghdr*)request;
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
hdr->nlmsg_type = XFRM_MSG_DELSA;
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
struct xfrm_usersa_id *sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
sa_id->daddr = dst->get_xfrm_addr(dst);
sa_id->spi = spi;
sa_id->proto = (protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH;
sa_id->family = dst->get_family(dst);
request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
request.hdr.nlmsg_type = XFRM_MSG_DELSA;
request.sa_id.daddr = dst->get_xfrm_addr(dst);
request.sa_id.spi = spi;
request.sa_id.proto = (protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH;
request.sa_id.family = dst->get_family(dst);
request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.sa_id)));
if (this->send_message(this, &request, &response) != SUCCESS)
if (this->send_message(this, hdr, &response) != SUCCESS)
{
this->logger->log(this->logger, ERROR, "netlink communication failed");
return FAILED;
}
else if (response->hdr.nlmsg_type != NLMSG_ERROR)
else if (response->nlmsg_type != NLMSG_ERROR)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_DELSA not acknowledged");
status = FAILED;
}
else if (response->e.error)
else if (((struct nlmsgerr*)NLMSG_DATA(response))->error)
{
this->logger->log(this->logger, ERROR|LEVEL1, "netlink request XFRM_MSG_DELSA received error: %s",
strerror(-response->e.error));
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_DELSA got an error: %s",
strerror(-((struct nlmsgerr*)NLMSG_DATA(response))->error));
status = FAILED;
}
@@ -488,71 +588,84 @@ static status_t add_policy(private_kernel_interface_t *this,
protocol_id_t protocol,
u_int32_t reqid)
{
netlink_message_t request, *response;
status_t status = SUCCESS;
xfrm_data_t *data;
this->logger->log(this->logger, CONTROL|LEVEL1, "Adding %s policy with reqid %d to kernel",
mapping_find(protocol_id_m, protocol), reqid);
unsigned char request[BUFFER_SIZE];
struct nlmsghdr *response;
memset(&request, 0, sizeof(request));
request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
status_t status = SUCCESS;
this->logger->log(this->logger, CONTROL|LEVEL2, "adding policy");
request.policy.sel.sport = htons(src->get_port(src));
request.policy.sel.dport = htons(dst->get_port(dst));
request.policy.sel.sport_mask = (request.policy.sel.sport) ? ~0 : 0;
request.policy.sel.dport_mask = (request.policy.sel.dport) ? ~0 : 0;
request.policy.sel.saddr = src->get_xfrm_addr(src);
request.policy.sel.daddr = dst->get_xfrm_addr(dst);
request.policy.sel.prefixlen_s = src_hostbits;
request.policy.sel.prefixlen_d = dst_hostbits;
request.policy.sel.proto = upper_proto;
request.policy.sel.family = src->get_family(src);
struct nlmsghdr *hdr = (struct nlmsghdr*)request;
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
hdr->nlmsg_type = XFRM_MSG_UPDPOLICY;
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info));
request.hdr.nlmsg_type = XFRM_MSG_UPDPOLICY;
request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.policy)));
request.policy.dir = direction;
request.policy.priority = SPD_PRIORITY;
request.policy.action = XFRM_POLICY_ALLOW;
request.policy.share = XFRM_SHARE_ANY;
struct xfrm_userpolicy_info *policy = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr);
policy->sel.sport = htons(src->get_port(src));
policy->sel.sport_mask = (policy->sel.sport) ? ~0 : 0;
policy->sel.saddr = src->get_xfrm_addr(src);
policy->sel.prefixlen_s = src_hostbits;
policy->sel.dport = htons(dst->get_port(dst));
policy->sel.dport_mask = (policy->sel.dport) ? ~0 : 0;
policy->sel.daddr = dst->get_xfrm_addr(dst);
policy->sel.prefixlen_d = dst_hostbits;
policy->sel.proto = upper_proto;
policy->sel.family = src->get_family(src);
policy->dir = direction;
policy->priority = SPD_PRIORITY;
policy->action = XFRM_POLICY_ALLOW;
policy->share = XFRM_SHARE_ANY;
/* policies currently don't expire */
request.policy.lft.soft_byte_limit = XFRM_INF;
request.policy.lft.soft_packet_limit = XFRM_INF;
request.policy.lft.hard_byte_limit = XFRM_INF;
request.policy.lft.hard_packet_limit = XFRM_INF;
request.sa.lft.soft_add_expires_seconds = 0;
request.sa.lft.hard_add_expires_seconds = 0;
request.sa.lft.soft_use_expires_seconds = 0;
request.sa.lft.hard_use_expires_seconds = 0;
policy->lft.soft_byte_limit = XFRM_INF;
policy->lft.soft_packet_limit = XFRM_INF;
policy->lft.hard_byte_limit = XFRM_INF;
policy->lft.hard_packet_limit = XFRM_INF;
policy->lft.soft_add_expires_seconds = 0;
policy->lft.hard_add_expires_seconds = 0;
policy->lft.soft_use_expires_seconds = 0;
policy->lft.hard_use_expires_seconds = 0;
data = (xfrm_data_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
data->type = XFRMA_TMPL;
struct rtattr *rthdr = (struct rtattr*)(request + hdr->nlmsg_len);
rthdr->rta_type = XFRMA_TMPL;
rthdr->rta_len = sizeof(struct xfrm_user_tmpl);
rthdr->rta_len = RTA_LENGTH(rthdr->rta_len);
hdr->nlmsg_len += rthdr->rta_len;
if (hdr->nlmsg_len > sizeof(request))
{
return FAILED;
}
data->tmpl.reqid = reqid;
data->tmpl.id.proto = protocol == PROTO_AH ? KERNEL_AH : KERNEL_ESP;
data->tmpl.aalgos = data->tmpl.ealgos = data->tmpl.calgos = ~0;
data->tmpl.mode = TRUE;
data->tmpl.saddr = me->get_xfrm_addr(me);
data->tmpl.id.daddr = me->get_xfrm_addr(other);
struct xfrm_user_tmpl *tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rthdr);
tmpl->reqid = reqid;
tmpl->id.proto = (protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH;
tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0;
tmpl->mode = TRUE;
data->length = 4 + sizeof(struct xfrm_user_tmpl);
request.hdr.nlmsg_len += data->length;
tmpl->saddr = me->get_xfrm_addr(me);
tmpl->id.daddr = other->get_xfrm_addr(other);
if (this->send_message(this, &request, &response) != SUCCESS)
if (this->send_message(this, hdr, &response) != SUCCESS)
{
this->logger->log(this->logger, ERROR, "netlink communication failed");
return FAILED;
}
else if (response->hdr.nlmsg_type != NLMSG_ERROR)
else if (response->nlmsg_type != NLMSG_ERROR)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_NEWPOLICY not acknowledged");
status = FAILED;
}
else if (response->e.error)
else if (((struct nlmsgerr*)NLMSG_DATA(response))->error)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_NEWPOLICY received error: %s",
strerror(-response->e.error));
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_NEWPOLICY got an error: %s",
strerror(-((struct nlmsgerr*)NLMSG_DATA(response))->error));
status = FAILED;
}
@@ -569,44 +682,49 @@ static status_t del_policy(private_kernel_interface_t *this,
u_int8_t src_hostbits, u_int8_t dst_hostbits,
int direction, int upper_proto)
{
netlink_message_t request, *response;
status_t status = SUCCESS;
this->logger->log(this->logger, CONTROL|LEVEL1, "Removing policy from kernel");
unsigned char request[BUFFER_SIZE];
struct nlmsghdr *response;
memset(&request, 0, sizeof(request));
request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
request.policy_id.sel.sport = htons(src->get_port(src));
request.policy_id.sel.dport = htons(dst->get_port(dst));
request.policy_id.sel.sport_mask = (request.policy.sel.sport) ? ~0 : 0;
request.policy_id.sel.dport_mask = (request.policy.sel.dport) ? ~0 : 0;
request.policy_id.sel.saddr = src->get_xfrm_addr(src);
request.policy_id.sel.daddr = dst->get_xfrm_addr(dst);
request.policy_id.sel.prefixlen_s = src_hostbits;
request.policy_id.sel.prefixlen_d = dst_hostbits;
request.policy_id.sel.proto = upper_proto;
request.policy_id.sel.family = src->get_family(src);
status_t status = SUCCESS;
request.policy_id.dir = direction;
this->logger->log(this->logger, CONTROL|LEVEL2, "deleting policy");
request.hdr.nlmsg_type = XFRM_MSG_DELPOLICY;
request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.policy_id)));
struct nlmsghdr *hdr = (struct nlmsghdr*)request;
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
hdr->nlmsg_type = XFRM_MSG_DELPOLICY;
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id));
struct xfrm_userpolicy_id *policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr);
policy_id->sel.sport = htons(src->get_port(src));
policy_id->sel.sport_mask = (policy_id->sel.sport) ? ~0 : 0;
policy_id->sel.saddr = src->get_xfrm_addr(src);
policy_id->sel.prefixlen_s = src_hostbits;
if (this->send_message(this, &request, &response) != SUCCESS)
policy_id->sel.dport = htons(dst->get_port(dst));
policy_id->sel.dport_mask = (policy_id->sel.dport) ? ~0 : 0;
policy_id->sel.daddr = dst->get_xfrm_addr(dst);
policy_id->sel.prefixlen_d = dst_hostbits;
policy_id->sel.proto = upper_proto;
policy_id->sel.family = src->get_family(src);
policy_id->dir = direction;
if (this->send_message(this, hdr, &response) != SUCCESS)
{
this->logger->log(this->logger, ERROR, "netlink communication failed");
return FAILED;
}
else if (response->hdr.nlmsg_type != NLMSG_ERROR)
else if (response->nlmsg_type != NLMSG_ERROR)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_DELPOLICY not acknowledged");
status = FAILED;
}
else if (response->e.error)
else if (((struct nlmsgerr*)NLMSG_DATA(response))->error)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_DELPOLICY received error: %s",
strerror(-response->e.error));
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_DELPOLICY got an error: %s",
strerror(-((struct nlmsgerr*)NLMSG_DATA(response))->error));
status = FAILED;
}
@@ -617,26 +735,26 @@ static status_t del_policy(private_kernel_interface_t *this,
/**
* Implementation of private_kernel_interface_t.send_message.
*/
static status_t send_message(private_kernel_interface_t *this, netlink_message_t *request, netlink_message_t **response)
static status_t send_message(private_kernel_interface_t *this, struct nlmsghdr *request, struct nlmsghdr **response)
{
size_t length;
struct sockaddr_nl addr;
request->hdr.nlmsg_seq = ++this->seq;
request->hdr.nlmsg_pid = this->pid;
request->nlmsg_seq = ++this->seq;
request->nlmsg_pid = 0;
memset(&addr, 0, sizeof(struct sockaddr_nl));
addr.nl_family = AF_NETLINK;
addr.nl_pid = 0;
addr.nl_groups = 0;
length = sendto(this->socket,(void *)request, request->hdr.nlmsg_len, 0, (struct sockaddr *)&addr, sizeof(addr));
length = sendto(this->socket,(void *)request, request->nlmsg_len, 0, (struct sockaddr *)&addr, sizeof(addr));
if (length < 0)
{
return FAILED;
}
else if (length != request->hdr.nlmsg_len)
else if (length != request->nlmsg_len)
{
return FAILED;
}
@@ -651,12 +769,13 @@ static status_t send_message(private_kernel_interface_t *this, netlink_message_t
iterator = this->responses->create_iterator(this->responses, TRUE);
while (iterator->has_next(iterator))
{
netlink_message_t *listed_response;
struct nlmsghdr *listed_response;
iterator->current(iterator, (void**)&listed_response);
if (listed_response->hdr.nlmsg_seq == request->hdr.nlmsg_seq)
if (listed_response->nlmsg_seq == request->nlmsg_seq)
{
/* matches our request, this is the reply */
*response = listed_response;
iterator->remove(iterator);
found = TRUE;
break;
}
@@ -683,7 +802,8 @@ static void receive_messages(private_kernel_interface_t *this)
{
while(TRUE)
{
netlink_message_t response, *listed_response;
unsigned char response[BUFFER_SIZE];
struct nlmsghdr *hdr, *listed_response;
while (TRUE)
{
struct sockaddr_nl addr;
@@ -692,7 +812,6 @@ static void receive_messages(private_kernel_interface_t *this)
addr_length = sizeof(addr);
response.hdr.nlmsg_type = XFRM_MSG_NEWSA;
length = recvfrom(this->socket, &response, sizeof(response), 0, (struct sockaddr*)&addr, &addr_length);
if (length < 0)
{
@@ -703,7 +822,7 @@ static void receive_messages(private_kernel_interface_t *this)
}
charon->kill(charon, "receiving from netlink socket failed");
}
if (!NLMSG_OK(&response.hdr, length))
if (!NLMSG_OK((struct nlmsghdr *)response, length))
{
/* bad netlink message */
continue;
@@ -719,44 +838,52 @@ static void receive_messages(private_kernel_interface_t *this)
/* we handle ACQUIRE and EXPIRE messages directly
*/
if (response.hdr.nlmsg_type == XFRM_MSG_ACQUIRE)
hdr = (struct nlmsghdr*)response;
if (hdr->nlmsg_type == XFRM_MSG_ACQUIRE)
{
this->logger->log(this->logger, CONTROL,
"Received a XFRM_MSG_ACQUIRE. Ignored");
}
else if (response.hdr.nlmsg_type == XFRM_MSG_EXPIRE)
else if (hdr->nlmsg_type == XFRM_MSG_EXPIRE)
{
job_t *job;
struct xfrm_user_expire *expire;
this->logger->log(this->logger, CONTROL|LEVEL1,
"Received a XFRM_MSG_EXPIRE");
if (response.expire.hard)
expire = (struct xfrm_user_expire*)NLMSG_DATA(hdr);
this->logger->log(this->logger, CONTROL|LEVEL0,
"creating %s job for CHILD_SA with reqid %d",
expire->hard ? "delete" : "rekey",
expire->state.reqid);
if (expire->hard)
{
this->logger->log(this->logger, CONTROL|LEVEL0,
"creating delete job for CHILD_SA with reqid %d",
response.expire.state.reqid);
expire->state.reqid);
job = (job_t*)delete_child_sa_job_create(
response.expire.state.reqid);
expire->state.reqid);
}
else
{
this->logger->log(this->logger, CONTROL|LEVEL0,
"creating rekey job for CHILD_SA with reqid %d",
response.expire.state.reqid);
expire->state.reqid);
job = (job_t*)rekey_child_sa_job_create(
response.expire.state.reqid);
expire->state.reqid);
}
charon->job_queue->add(charon->job_queue, job);
}
/* NLMSG_ERROR is send back for acknowledge (or on error), an
* XFRM_MSG_NEWSA is returned when we alloc spis.
/* NLMSG_ERROR is sent back for acknowledge (or on error), an
* XFRM_MSG_NEWSA is returned when we alloc spis and when
* updating SAs.
* list these responses for the sender
*/
else if (response.hdr.nlmsg_type == NLMSG_ERROR ||
response.hdr.nlmsg_type == XFRM_MSG_NEWSA)
else if (hdr->nlmsg_type == NLMSG_ERROR ||
hdr->nlmsg_type == XFRM_MSG_NEWSA)
{
/* add response to queue */
listed_response = malloc(sizeof(response));
memcpy(listed_response, &response, sizeof(response));
listed_response = malloc(hdr->nlmsg_len);
memcpy(listed_response, &response, hdr->nlmsg_len);
pthread_mutex_lock(&(this->mutex));
this->responses->insert_last(this->responses, (void*)listed_response);
@@ -792,8 +919,9 @@ kernel_interface_t *kernel_interface_create()
/* public functions */
this->public.get_spi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,protocol_id_t,u_int32_t,u_int32_t*))get_spi;
this->public.add_sa = (status_t(*)(kernel_interface_t *,host_t*,host_t*,u_int32_t,protocol_id_t,u_int32_t,u_int64_t,u_int64_t,algorithm_t*,algorithm_t*,prf_plus_t*,bool))add_sa;
this->public.add_sa = (status_t(*)(kernel_interface_t *,host_t*,host_t*,u_int32_t,protocol_id_t,u_int32_t,u_int64_t,u_int64_t,algorithm_t*,algorithm_t*,prf_plus_t*,natt_conf_t*,bool))add_sa;
this->public.add_policy = (status_t(*)(kernel_interface_t*,host_t*, host_t*,host_t*,host_t*,u_int8_t,u_int8_t,int,int,protocol_id_t,u_int32_t))add_policy;
this->public.update_sa_hosts = (status_t(*)(kernel_interface_t*,host_t*,host_t*,host_t*,host_t*,int,int,u_int32_t,protocol_id_t))update_sa_hosts;
this->public.del_sa = (status_t(*)(kernel_interface_t*,host_t*,u_int32_t,protocol_id_t))del_sa;
this->public.del_policy = (status_t(*)(kernel_interface_t*,host_t*,host_t*,host_t*,host_t*,u_int8_t,u_int8_t,int,int))del_policy;
@@ -817,6 +945,7 @@ kernel_interface_t *kernel_interface_create()
free(this);
charon->kill(charon, "Unable to create netlink socket");
}
/* bind the socket and reqister for ACQUIRE & EXPIRE */
addr.nl_family = AF_NETLINK;
addr.nl_pid = getpid();