diff options
| -rw-r--r-- | include/net/cipso_ipv4.h | 17 | ||||
| -rw-r--r-- | net/ipv4/cipso_ipv4.c | 130 |
2 files changed, 147 insertions, 0 deletions
diff --git a/include/net/cipso_ipv4.h b/include/net/cipso_ipv4.h index bedc7f62e35..abd443604c9 100644 --- a/include/net/cipso_ipv4.h +++ b/include/net/cipso_ipv4.h @@ -40,6 +40,7 @@ #include <linux/net.h> #include <linux/skbuff.h> #include <net/netlabel.h> +#include <net/request_sock.h> #include <asm/atomic.h> /* known doi values */ @@ -215,6 +216,10 @@ int cipso_v4_sock_setattr(struct sock *sk, const struct netlbl_lsm_secattr *secattr); void cipso_v4_sock_delattr(struct sock *sk); int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr); +int cipso_v4_req_setattr(struct request_sock *req, + const struct cipso_v4_doi *doi_def, + const struct netlbl_lsm_secattr *secattr); +void cipso_v4_req_delattr(struct request_sock *req); int cipso_v4_skbuff_setattr(struct sk_buff *skb, const struct cipso_v4_doi *doi_def, const struct netlbl_lsm_secattr *secattr); @@ -247,6 +252,18 @@ static inline int cipso_v4_sock_getattr(struct sock *sk, return -ENOSYS; } +static inline int cipso_v4_req_setattr(struct request_sock *req, + const struct cipso_v4_doi *doi_def, + const struct netlbl_lsm_secattr *secattr) +{ + return -ENOSYS; +} + +static inline void cipso_v4_req_delattr(struct request_sock *req) +{ + return; +} + static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb, const struct cipso_v4_doi *doi_def, const struct netlbl_lsm_secattr *secattr) diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c index 7bc992976d2..4ea2c389c84 100644 --- a/net/ipv4/cipso_ipv4.c +++ b/net/ipv4/cipso_ipv4.c @@ -1942,6 +1942,72 @@ socket_setattr_failure: } /** + * cipso_v4_req_setattr - Add a CIPSO option to a connection request socket + * @req: the connection request socket + * @doi_def: the CIPSO DOI to use + * @secattr: the specific security attributes of the socket + * + * Description: + * Set the CIPSO option on the given socket using the DOI definition and + * security attributes passed to the function. Returns zero on success and + * negative values on failure. + * + */ +int cipso_v4_req_setattr(struct request_sock *req, + const struct cipso_v4_doi *doi_def, + const struct netlbl_lsm_secattr *secattr) +{ + int ret_val = -EPERM; + unsigned char *buf = NULL; + u32 buf_len; + u32 opt_len; + struct ip_options *opt = NULL; + struct inet_request_sock *req_inet; + + /* We allocate the maximum CIPSO option size here so we are probably + * being a little wasteful, but it makes our life _much_ easier later + * on and after all we are only talking about 40 bytes. */ + buf_len = CIPSO_V4_OPT_LEN_MAX; + buf = kmalloc(buf_len, GFP_ATOMIC); + if (buf == NULL) { + ret_val = -ENOMEM; + goto req_setattr_failure; + } + + ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr); + if (ret_val < 0) + goto req_setattr_failure; + buf_len = ret_val; + + /* We can't use ip_options_get() directly because it makes a call to + * ip_options_get_alloc() which allocates memory with GFP_KERNEL and + * we won't always have CAP_NET_RAW even though we _always_ want to + * set the IPOPT_CIPSO option. */ + opt_len = (buf_len + 3) & ~3; + opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC); + if (opt == NULL) { + ret_val = -ENOMEM; + goto req_setattr_failure; + } + memcpy(opt->__data, buf, buf_len); + opt->optlen = opt_len; + opt->cipso = sizeof(struct iphdr); + kfree(buf); + buf = NULL; + + req_inet = inet_rsk(req); + opt = xchg(&req_inet->opt, opt); + kfree(opt); + + return 0; + +req_setattr_failure: + kfree(buf); + kfree(opt); + return ret_val; +} + +/** * cipso_v4_sock_delattr - Delete the CIPSO option from a socket * @sk: the socket * @@ -2016,6 +2082,70 @@ void cipso_v4_sock_delattr(struct sock *sk) } /** + * cipso_v4_req_delattr - Delete the CIPSO option from a request socket + * @reg: the request socket + * + * Description: + * Removes the CIPSO option from a request socket, if present. + * + */ +void cipso_v4_req_delattr(struct request_sock *req) +{ + struct ip_options *opt; + struct inet_request_sock *req_inet; + + req_inet = inet_rsk(req); + opt = req_inet->opt; + if (opt == NULL || opt->cipso == 0) + return; + + if (opt->srr || opt->rr || opt->ts || opt->router_alert) { + u8 cipso_len; + u8 cipso_off; + unsigned char *cipso_ptr; + int iter; + int optlen_new; + + cipso_off = opt->cipso - sizeof(struct iphdr); + cipso_ptr = &opt->__data[cipso_off]; + cipso_len = cipso_ptr[1]; + + if (opt->srr > opt->cipso) + opt->srr -= cipso_len; + if (opt->rr > opt->cipso) + opt->rr -= cipso_len; + if (opt->ts > opt->cipso) + opt->ts -= cipso_len; + if (opt->router_alert > opt->cipso) + opt->router_alert -= cipso_len; + opt->cipso = 0; + + memmove(cipso_ptr, cipso_ptr + cipso_len, + opt->optlen - cipso_off - cipso_len); + + /* determining the new total option length is tricky because of + * the padding necessary, the only thing i can think to do at + * this point is walk the options one-by-one, skipping the + * padding at the end to determine the actual option size and + * from there we can determine the new total option length */ + iter = 0; + optlen_new = 0; + while (iter < opt->optlen) + if (opt->__data[iter] != IPOPT_NOP) { + iter += opt->__data[iter + 1]; + optlen_new = iter; + } else + iter++; + opt->optlen = (optlen_new + 3) & ~3; + } else { + /* only the cipso option was present on the socket so we can + * remove the entire option struct */ + req_inet->opt = NULL; + kfree(opt); + } +} + +/** * cipso_v4_getattr - Helper function for the cipso_v4_*_getattr functions * @cipso: the CIPSO v4 option * @secattr: the security attributes |