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sockets: expose raw sockets to userspace

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Matheus
2026-09-10 17:56:54 -03:00
parent e17ba000e2
commit 66b0cb9076
3 changed files with 52 additions and 5 deletions
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kernel-src/include/kernel/abi.h
+11
View File
@@ -88,6 +88,7 @@ typedef struct {
#define AF_LOCAL 1
#define AF_INET 2
#define AF_PACKET 17
#define SOCK_STREAM 1
#define SOCK_DGRAM 2
@@ -155,6 +156,16 @@ typedef struct {
char sun_path[ABISOCKADDR_UN_MAX];
} unaddr_t;
typedef struct {
uint16_t sll_family;
uint16_t sll_protocol;
int32_t sll_ifindex;
uint16_t sll_hatype;
uint8_t sll_pkttype;
uint8_t sll_halen;
uint8_t sll_addr[8];
} sockaddr_ll_t;
typedef struct {
void *addr;
socklen_t addrlen;
kernel-src/include/kernel/sock.h
+36 -5
View File
@@ -175,8 +175,8 @@ static inline int socket_send(socket_t *socket, void *buffer, size_t size, uintm
return e;
}
static inline int sock_convertaddress(sockaddr_t *sockaddr, abisockaddr_t *abisockaddr) {
switch (abisockaddr->type) {
static inline int sock_convertaddress(sockaddr_t *sockaddr, void *abisockaddr) {
switch (((abisockaddr_t *)abisockaddr)->type) {
case AF_INET:
inaddr_t *inaddr = (inaddr_t *)abisockaddr;
sockaddr->ipv4addr.addr = be_to_cpu_d(inaddr->sin_addr);
@@ -190,6 +190,18 @@ static inline int sock_convertaddress(sockaddr_t *sockaddr, abisockaddr_t *abiso
memcpy(sockaddr->path, unaddr->sun_path, length + 1);
break;
case AF_PACKET: {
sockaddr_ll_t lladdr;
memcpy(&lladdr, abisockaddr, sizeof(lladdr));
if (lladdr.sll_ifindex < 0 || lladdr.sll_ifindex > 0xffff)
return EINVAL;
sockaddr->raw.netdev = lladdr.sll_ifindex;
sockaddr->raw.proto = be_to_cpu_w(lladdr.sll_protocol);
memset(sockaddr->raw.mac, 0, sizeof(sockaddr->raw.mac));
memcpy(sockaddr->raw.mac, lladdr.sll_addr, min((size_t)lladdr.sll_halen, sizeof(sockaddr->raw.mac)));
break;
}
default:
return EINVAL;
}
@@ -197,21 +209,33 @@ static inline int sock_convertaddress(sockaddr_t *sockaddr, abisockaddr_t *abiso
return 0;
}
static inline int sock_addrtoabiaddr(int socktype, sockaddr_t *sockaddr, abisockaddr_t *abisockaddr) {
static inline int sock_addrtoabiaddr(int socktype, sockaddr_t *sockaddr, void *abisockaddr) {
switch (socktype) {
case SOCKET_TYPE_UDP:
case SOCKET_TYPE_TCP:
abisockaddr->type = AF_INET;
((abisockaddr_t *)abisockaddr)->type = AF_INET;
inaddr_t *inaddr = (inaddr_t *)abisockaddr;
inaddr->sin_addr = cpu_to_be_d(sockaddr->ipv4addr.addr);
inaddr->sin_port = cpu_to_be_w(sockaddr->ipv4addr.port);
break;
case SOCKET_TYPE_LOCAL:
case SOCKET_TYPE_LOCAL_SEQPACKET:
abisockaddr->type = AF_LOCAL;
((abisockaddr_t *)abisockaddr)->type = AF_LOCAL;
unaddr_t *unaddr = (unaddr_t *)abisockaddr;
strcpy(unaddr->sun_path, sockaddr->path);
break;
case SOCKET_TYPE_RAW_STRIPPED: {
sockaddr_ll_t lladdr = {
.sll_family = AF_PACKET,
.sll_protocol = cpu_to_be_w(sockaddr->raw.proto),
.sll_ifindex = sockaddr->raw.netdev,
.sll_hatype = ARPHRD_ETHER,
.sll_halen = sizeof(sockaddr->raw.mac)
};
memcpy(lladdr.sll_addr, sockaddr->raw.mac, sizeof(sockaddr->raw.mac));
memcpy(abisockaddr, &lladdr, sizeof(lladdr));
break;
}
default:
return EINVAL;
}
@@ -253,6 +277,13 @@ static inline int sock_copy_addr_to_user(int socktype, sockaddr_t *sockaddr, voi
return 0;
}
case SOCKET_TYPE_RAW_STRIPPED: {
sockaddr_ll_t lladdr = {0};
sock_addrtoabiaddr(socktype, sockaddr, &lladdr);
*actual_len = sizeof(lladdr);
return usercopy_touser(uaddr, &lladdr, min(uaddrlen, sizeof(lladdr)));
}
default:
return EINVAL;
}