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BPF's load instructions automatically convert the loaded argument from host

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to network byte order, thus BPF is endian independent.

Make the ARP BPF static const again.
This commit is contained in:
Nicholas J. Kain 2011-07-01 02:37:19 -04:00
parent 9ddfab5085
commit 927e2590a2
1 changed files with 5 additions and 5 deletions
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10
ndhc/arp.c
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@ -49,18 +49,18 @@ static int arp_packet_num;
static int arp_open_fd(struct client_state_t *cs) static int arp_open_fd(struct client_state_t *cs)
{ {
struct sock_filter sf_arp[] = { static const struct sock_filter sf_arp[] = {
// Verify that the frame has ethernet protocol type of ARP. // Verify that the frame has ethernet protocol type of ARP.
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 12), BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 12),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, htons(ETH_P_ARP), 1, 0), BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETH_P_ARP, 1, 0),
BPF_STMT(BPF_RET + BPF_K, 0), BPF_STMT(BPF_RET + BPF_K, 0),
// Verify that the ARP hardware type field indicates Ethernet. // Verify that the ARP hardware type field indicates Ethernet.
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 14), BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 14),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, htons(ARPHRD_ETHER), 1, 0), BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ARPHRD_ETHER, 1, 0),
BPF_STMT(BPF_RET + BPF_K, 0), BPF_STMT(BPF_RET + BPF_K, 0),
// Verify that the ARP protocol type field indicates IP. // Verify that the ARP protocol type field indicates IP.
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 16), BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 16),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, htons(ETH_P_IP), 1, 0), BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETH_P_IP, 1, 0),
BPF_STMT(BPF_RET + BPF_K, 0), BPF_STMT(BPF_RET + BPF_K, 0),
// Verify that the ARP hardware address length field is 6. // Verify that the ARP hardware address length field is 6.
BPF_STMT(BPF_LD + BPF_B + BPF_ABS, 18), BPF_STMT(BPF_LD + BPF_B + BPF_ABS, 18),
@ -73,7 +73,7 @@ static int arp_open_fd(struct client_state_t *cs)
// Sanity tests passed, so send all possible data. // Sanity tests passed, so send all possible data.
BPF_STMT(BPF_RET + BPF_K, 0x0fffffff), BPF_STMT(BPF_RET + BPF_K, 0x0fffffff),
}; };
struct sock_fprog sfp_arp = { static const struct sock_fprog sfp_arp = {
.len = sizeof sf_arp / sizeof sf_arp[0], .len = sizeof sf_arp / sizeof sf_arp[0],
.filter = (struct sock_filter *)sf_arp, .filter = (struct sock_filter *)sf_arp,
}; };